Remove TOR_HOME variable in prod/install

Add Unfurl to the prod installer

.github/FUNDING.yml

@@ -1,6 +1,6 @@
 # These are supported funding model platforms
 
-github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: ['mempool'] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
 patreon: # Replace with a single Patreon username
 open_collective: # Replace with a single Open Collective username
 ko_fi: # Replace with a single Ko-fi username
@@ -9,4 +9,4 @@ community_bridge: # Replace with a single Community Bridge project-name e.g., cl
 liberapay: # Replace with a single Liberapay username
 issuehunt: # Replace with a single IssueHunt username
 otechie: # Replace with a single Otechie username
-custom: ['https://mempool.space/about'] # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+custom: ['https://mempool.space/sponsor'] # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE.md

@@ -1,37 +0,0 @@
-<!--
-   SUPPORT REQUESTS: This is for reporting bugs in Mempool.
-   If you have a support request, please join our Keybase group:
-   https://keybase.io/team/mempool
--->
-
-### Description
-
-<!-- brief description of the bug -->
-
-#### Version
-
-<!-- commit id or version number -->
-
-### Steps to reproduce
-
-<!--if you can reliably reproduce the bug, list the steps here  -->
-
-### Expected behaviour
-
-<!--description of the expected behavior -->
-
-### Actual behaviour
-
-<!-- explain what happened instead of the expected behaviour -->
-
-### Screenshots
-
-<!--Screenshots if gui related, drag and drop to add to the issue -->
-
-#### Device or machine
-
-<!-- device/machine used, operating system -->
-
-#### Additional info
-
-<!-- Additional information useful for debugging (e.g. logs) -->

.github/ISSUE_TEMPLATE/00-bug-issue.md

@@ -0,0 +1,43 @@
+---
+name: 🐛 Bug Report
+about: Report bugs (no support requests, please)
+---
+
+<!--
+   SUPPORT REQUESTS:
+   This is for reporting bugs in Mempool, not for support requests. 
+   If you have a support request, please reach out on Matrix:
+   https://matrix.to/#/#mempool.support:bitcoin.kyoto
+-->
+
+### Description
+
+<!-- brief description of the bug -->
+
+#### Version
+
+<!-- commit id or version number -->
+
+### Steps to reproduce
+
+<!-- if you can reliably reproduce the bug, list the steps here -->
+
+### Expected behaviour
+
+<!-- description of the expected behavior -->
+
+### Actual behaviour
+
+<!-- explain what happened instead of the expected behaviour -->
+
+### Screenshots
+
+<!-- Screenshots if gui related, drag and drop to add to the issue -->
+
+#### Device or machine
+
+<!-- device/machine used, operating system -->
+
+#### Additional info
+
+<!-- Additional information useful for debugging (e.g. logs) -->

.github/ISSUE_TEMPLATE/30-feature-request.md

@@ -0,0 +1,27 @@
+---
+name: ✨ Feature Request
+about: Request a feature or suggest other enhancements
+---
+
+<!--
+   SUPPORT REQUESTS:
+   This is for requesting features in Mempool, not for support requests. 
+   If you have a support request, please reach out on Matrix:
+   https://matrix.to/#/#mempool.support:bitcoin.kyoto
+-->
+
+### Description
+
+<!-- brief description of the feature request -->
+
+### Problem to be solved
+
+<!-- description of the the problem you're having -->
+
+### Proposed solution
+
+<!-- explain how you think we should solve the problem -->
+
+#### Additional info
+
+<!-- Additional information useful for implementing (e.g. docs, links, etc.) -->

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 🙋 Need help? Chat with us on Matrix
+    url: https://matrix.to/#/#mempool.support:bitcoin.kyoto
+    about: For support requests or general questions
+  - name: 🌐 Want to help with translations? Use Transifex
+    url: https://www.transifex.com/mempool/mempool
+    about: All translations work is done on Transifex

.github/dependabot.yml

@@ -0,0 +1,20 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/backend"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+- package-ecosystem: npm
+  directory: "/frontend"
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+- package-ecosystem: docker
+  directory: "/docker/backend"
+  schedule:
+    interval: weekly
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+      interval: "weekly"

.github/pull_request_template.md

@@ -0,0 +1,6 @@
+<!--
+Please do not open pull requests for translations.
+
+All translations work is done on Transifex:
+https://www.transifex.com/mempool/mempool
+-->

.github/workflows/ci.yml

@@ -0,0 +1,94 @@
+name: CI Pipeline for the Backend and Frontend
+
+on:
+  pull_request:
+    types: [opened, review_requested, synchronize]
+
+jobs:
+  backend:
+    if: "!contains(github.event.pull_request.labels.*.name, 'ops') && !contains(github.head_ref, 'ops/')"
+    strategy:
+      matrix:
+        node: ["16.16.0", "18.5.0"]
+        flavor: ["dev", "prod"]
+      fail-fast: false
+    runs-on: "ubuntu-latest"
+
+    name: Backend (${{ matrix.flavor }}) - node ${{ matrix.node }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          path: ${{ matrix.node }}/${{ matrix.flavor }}
+
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node }}
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Install
+        if: ${{ matrix.flavor == 'dev'}}
+        run: npm ci
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/backend
+
+      - name: Install (Prod dependencies only)
+        if: ${{ matrix.flavor == 'prod'}}
+        run: npm ci --omit=dev --omit=optional
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/backend
+
+      - name: Lint
+        if: ${{ matrix.flavor == 'dev'}}
+        run: npm run lint
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/backend
+
+      #  - name: Test
+      #    run: npm run test
+
+      - name: Build
+        run: npm run build
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/backend
+
+  frontend:
+    if: "!contains(github.event.pull_request.labels.*.name, 'ops') && !contains(github.head_ref, 'ops/')"
+    strategy:
+      matrix:
+        node: ["16.15.0", "18.5.0"]
+        flavor: ["dev", "prod"]
+      fail-fast: false
+    runs-on: "ubuntu-latest"
+
+    name: Frontend (${{ matrix.flavor }}) - node ${{ matrix.node }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          path: ${{ matrix.node }}/${{ matrix.flavor }}
+
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node }}
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Install (Prod dependencies only)
+        run: npm ci --omit=dev --omit=optional
+        if: ${{ matrix.flavor == 'prod'}}
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/frontend
+
+      - name: Install
+        if: ${{ matrix.flavor == 'dev'}}
+        run: npm ci
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/frontend
+
+      - name: Lint
+        if: ${{ matrix.flavor == 'dev'}}
+        run: npm run lint
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/frontend
+
+      # - name: Test
+      #   run: npm run test
+
+      - name: Build
+        run: npm run build
+        working-directory: ${{ matrix.node }}/${{ matrix.flavor }}/frontend

.github/workflows/cypress.yml

@@ -0,0 +1,61 @@
+name: Cypress Tests
+
+on:
+  pull_request:
+    types: [ opened, review_requested, synchronize ]
+jobs:
+  cypress:
+    if: "!contains(github.event.pull_request.labels.*.name, 'ops') && !contains(github.head_ref, 'ops/')"
+    runs-on: "ubuntu-latest"
+    strategy:
+      fail-fast: false
+      matrix:
+        module: ["mempool", "liquid", "bisq"]
+        include:
+          - module: "mempool"
+            spec: |
+              cypress/e2e/mainnet/*.spec.ts
+              cypress/e2e/signet/*.spec.ts
+              cypress/e2e/testnet/*.spec.ts
+          - module: "liquid"
+            spec: |
+              cypress/e2e/liquid/liquid.spec.ts
+              cypress/e2e/liquidtestnet/liquidtestnet.spec.ts
+          - module: "bisq"
+            spec: |
+              cypress/e2e/bisq/bisq.spec.ts
+          
+    name: E2E tests for ${{ matrix.module }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          path: ${{ matrix.module }}
+          
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16.15.0
+          cache: 'npm'
+          cache-dependency-path: ${{ matrix.module }}/frontend/package-lock.json
+
+      - name: Chrome browser tests (${{ matrix.module }})
+        uses: cypress-io/github-action@v4
+        with:
+          tag: ${{ github.event_name }}
+          working-directory: ${{ matrix.module }}/frontend
+          build: npm run config:defaults:${{ matrix.module }}
+          start: npm run start:local-staging
+          wait-on: 'http://localhost:4200'
+          wait-on-timeout: 120
+          record: true
+          parallel: true
+          spec: ${{ matrix.spec }}
+          group: Tests on Chrome (${{ matrix.module }})
+          browser: "chrome"
+          ci-build-id: '${{ github.sha }}-${{ github.workflow }}-${{ github.event_name }}'
+        env:
+          COMMIT_INFO_MESSAGE: ${{ github.event.pull_request.title }}
+          CYPRESS_RECORD_KEY: ${{ secrets.CYPRESS_RECORD_KEY }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CYPRESS_PROJECT_ID: ${{ secrets.CYPRESS_PROJECT_ID }}

.github/workflows/on-tag.yml

@@ -0,0 +1,75 @@
+name: Docker build on tag
+env:
+  DOCKER_CLI_EXPERIMENTAL: enabled
+  TAG_FMT: '^refs/tags/(((.?[0-9]+){3,4}))$'
+  DOCKER_BUILDKIT: 0
+  COMPOSE_DOCKER_CLI_BUILD: 0
+
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+      - v[0-9]+.[0-9]+.[0-9]+-*
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        service:
+          - frontend
+          - backend
+    runs-on: ubuntu-18.04
+    name: Build and push to DockerHub
+    steps:
+      - name: Set env variables
+        run: echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+
+      - name: Show set environment variables
+        run: |
+          printf "      TAG: %s\n"  "$TAG"
+      
+      - name: Add SHORT_SHA env property with commit short sha
+        run: echo "SHORT_SHA=`echo ${GITHUB_SHA} | cut -c1-8`" >> $GITHUB_ENV
+
+      - name: Login to Docker for building
+        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: Checkout project
+        uses: actions/checkout@629c2de402a417ea7690ca6ce3f33229e27606a5 # v2
+
+      - name: Init repo for Dockerization
+        run: docker/init.sh "$TAG"
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@27d0a4f181a40b142cce983c5393082c365d1480 # v1
+        id: qemu
+
+      - name: Setup Docker buildx action
+        uses: docker/setup-buildx-action@94ab11c41e45d028884a99163086648e898eed25 # v1
+        id: buildx
+
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+
+      - name: Cache Docker layers
+        uses: actions/cache@661fd3eb7f2f20d8c7c84bc2b0509efd7a826628 # v2
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Run Docker buildx for ${{ matrix.service }} against tag
+        run: |
+          docker buildx build \
+          --cache-from "type=local,src=/tmp/.buildx-cache" \
+          --cache-to "type=local,dest=/tmp/.buildx-cache" \
+          --platform linux/amd64,linux/arm64,linux/arm/v7 \
+          --tag ${{ secrets.DOCKER_HUB_USER }}/${{ matrix.service }}:$TAG \
+          --tag ${{ secrets.DOCKER_HUB_USER }}/${{ matrix.service }}:latest \
+          --output "type=registry" ./${{ matrix.service }}/ \
+          --build-arg commitHash=$SHORT_SHA

.gitignore

@@ -1 +1,5 @@
 sitemap
+data
+docker-compose.yml
+backend/mempool-config.json
+*.swp

.nvmrc

@@ -0,0 +1 @@
+v16.16.0

.vscode/settings.json

@@ -0,0 +1,4 @@
+{
+  "editor.tabSize": 2,
+  "typescript.tsdk": "./backend/node_modules/typescript/lib"
+}

CONTRIBUTING.md

@@ -0,0 +1,51 @@
+# Contributing to The Mempool Open Source Project
+
+Thank you for contributing to The Mempool Open Source Project managed by Mempool Space K.K. (“Mempool”).
+
+In order to clarify the intellectual property license granted with Contributions from any person or entity, Mempool must have a statement on file from each Contributor indicating their agreement to the Contributor License Agreement (“Agreement”). This license is for your protection as a Contributor as well as the protection of Mempool and its other contributors and users; it does not change your rights to use your own Contributions for any other purpose.
+
+When submitting a pull request for the first time, please create a file with a name like `/contributors/{github_username}.txt`, and in the content of that file indicate your agreement to the Contributor License Agreement terms below. An example of what that file should contain can be seen in wiz's agreement file. (This method of CLA "signing" is borrowed from Medium's open source project.)
+
+Also, please GPG-sign all your commits (`git config commit.gpgsign true`).
+
+# Contributor License Agreement
+
+Last Updated: January 25, 2022
+
+By accepting this Agreement, You agree to the following terms and conditions for Your present and future Contributions submitted to Mempool. Except for the license granted herein to Mempool and recipients of software distributed by Mempool, You reserve all right, title, and interest in and to Your Contributions.
+
+### 1. Definitions
+
+“You” (or “Your”) shall mean the copyright owner or legal entity authorized by the copyright owner that is making this Agreement with Mempool. For legal entities, the entity making a Contribution and all other entities that control, are controlled by, or are under common control with that entity are considered to be a single Contributor. For the purposes of this definition, “control” means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
+
+“Contribution” shall mean any original work of authorship, including any modifications or additions to an existing work, that is intentionally submitted by You to Mempool for inclusion in, or documentation of, any of the products owned or managed by Mempool (“Work”). For the purposes of this definition, “submitted” means any form of electronic, verbal, or written communication sent to Mempool or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, Mempool for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by You as “Not a Contribution.”
+
+### 2. Grant of Copyright License
+
+Subject to the terms and conditions of this Agreement, You hereby grant to Mempool and to recipients of software distributed by Mempool a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Your Contributions and such derivative works.
+
+### 3. Grant of Patent License
+
+Subject to the terms and conditions of this Agreement, You hereby grant to Mempool and to recipients of software distributed by Mempool a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by You that are necessarily infringed by Your Contribution(s) alone or by combination of Your Contribution(s) with the Work to which such Contribution(s) was submitted. If any entity institutes patent litigation against You or any other entity (including a cross-claim or counterclaim in a lawsuit) alleging that your Contribution, or the Work to which you have contributed, constitutes direct or contributory patent infringement, then any patent licenses granted to that entity under this Agreement for that Contribution or Work shall terminate as of the date such litigation is filed.
+
+### 4. Authority
+
+You represent that you are legally entitled to grant the above license. If your employer(s) has rights to intellectual property that you create that includes your Contributions, you represent that you have received permission to make Contributions on behalf of that employer, that your employer has waived such rights for your Contributions to Mempool, or that your employer has executed a separate Corporate Contributor License Agreement with Mempool.
+
+### 5. Originality
+
+You represent that each of Your Contributions is Your original creation (see section 7 for submissions on behalf of others). You represent that Your Contribution submissions include complete details of any third-party license or other restriction (including, but not limited to, related patents and trademarks) of which you are personally aware, and which are associated with any part of Your Contributions.
+
+### 6. Support
+
+You are not expected to provide support for Your Contributions, except to the extent You desire to provide support. You may provide support for free, for a fee, or not at all. Unless required by applicable law or agreed to in writing, You provide Your Contributions on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON- INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE.
+
+### 7. Third Party Contributions
+
+Should You wish to submit work that is not Your original creation, You may submit it to Mempool separately from any Contribution, identifying the complete details of its source and of any license or other restriction (including, but not limited to, related patents, trademarks, and license agreements) of which you are personally aware, and conspicuously marking the work as “Submitted on behalf of a third-party: [named here]”.
+
+### 8. Notifications
+
+You agree to notify Mempool of any facts or circumstances of which you become aware that would make these representations inaccurate in any respect.
+
+EOF

GNUmakefile

@@ -0,0 +1,47 @@
+# If you see pwd_unknown showing up check permissions
+PWD ?= pwd_unknown
+
+# DATABASE DEPLOY FOLDER CONFIG - default ./data
+ifeq ($(data),)
+DATA := data
+export DATA
+else
+DATA := $(data)
+export DATA
+endif
+
+.PHONY: help
+help:
+	@echo ''
+	@echo ''
+	@echo '	Usage: make [COMMAND]'
+	@echo ''
+	@echo '		make all		# build init mempool and electrs'
+	@echo '		make init		# setup some useful configs'
+	@echo '		make mempool		# build q dockerized mempool.space'
+	@echo '		make electrs		# build a docker electrs image'
+	@echo ''
+
+.PHONY: init
+init:
+	@echo ''
+	mkdir -p   $(DATA) $(DATA)/mysql $(DATA)/mysql/data 
+	#REF: https://github.com/mempool/mempool/blob/master/docker/README.md
+	cat docker/docker-compose.yml > docker-compose.yml
+	cat backend/mempool-config.sample.json > backend/mempool-config.json
+.PHONY: mempool
+mempool: init
+	@echo ''
+	docker-compose up --force-recreate --always-recreate-deps
+	@echo ''
+.PHONY: electrs
+electrum:
+	#REF: https://hub.docker.com/r/beli/electrum
+	@echo ''
+	docker build -f docker/electrum/Dockerfile .
+	@echo ''
+.PHONY: all
+all: init
+	make mempool
+#######################
+-include Makefile

LICENSE

@@ -1,35 +1,29 @@
-MIT License with Commons Clause License Condition v1.0
+The Mempool Open Source Project
+Copyright (c) 2019-2022 The Mempool Open Source Project Developers
 
-Copyright (c) 2019-2020 The Mempool Open Source Project
+This program is free software; you can redistribute it and/or modify it under
+the terms of (at your option) either:
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, and/or sublicense
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+ 1) the GNU Affero General Public License as published by the Free Software
+ Foundation, either version 3 of the License or any later version approved by a
+ proxy statement published on <https://mempool.space/about>; or
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+ 2) the GNU General Public License as published by the Free Software
+ Foundation, either version 3 of the License or any later version approved by a
+ proxy statement published on <https://mempool.space/about>.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+However, this copyright license does not include an implied right or license to
+use our trademarks: The Mempool Open Source Project™, mempool.space™, the
+mempool Logo™, the mempool.space Vertical Logo™, the mempool.space Horizontal
+Logo™, the mempool Square Logo™, and the mempool Blocks logo™ are registered
+trademarks or trademarks of Mempool Space K.K in Japan, the United States,
+and/or other countries. See our full Trademark Policy and Guidelines for more
+details, published on <https://mempool.space/trademark-policy>.
 
-Commons Clause License Condition v1.0
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the full license terms for more details.
 
-Without limiting other conditions in the License, the grant of rights under
-the License will not include, and the License does not grant to you, the
-right to Sell the Software.
-
-For purposes of the foregoing, “Sell” means practicing any or all of the
-rights granted to you under the License to provide to third parties, for a
-fee or other consideration (including without limitation fees for hosting or
-consulting/ support services related to the Software), a product or service
-whose value derives, entirely or substantially, from the functionality of
-the Software. Any license notice or attribution required by the License must
-also include this Commons Cause License Condition notice.
+You should have received a copy of both the GNU Affero General Public License
+and the GNU General Public License along with this program.  If not, see
+<http://www.gnu.org/licenses/>.

LICENSE.AGPL-3.md

@@ -0,0 +1,660 @@
+### GNU AFFERO GENERAL PUBLIC LICENSE
+
+Version 3, 19 November 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc.
+<https://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+### Preamble
+
+The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains
+free software for all its users.
+
+When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate. Many developers of free software are heartened and
+encouraged by the resulting cooperation. However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community. It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server. Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals. This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing
+under this license.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+### TERMS AND CONDITIONS
+
+#### 0. Definitions.
+
+"This License" refers to version 3 of the GNU Affero General Public
+License.
+
+"Copyright" also means copyright-like laws that apply to other kinds
+of works, such as semiconductor masks.
+
+"The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
+"recipients" may be individuals or organizations.
+
+To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of
+an exact copy. The resulting work is called a "modified version" of
+the earlier work or a work "based on" the earlier work.
+
+A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy. Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies. Mere interaction with a user
+through a computer network, with no transfer of a copy, is not
+conveying.
+
+An interactive user interface displays "Appropriate Legal Notices" to
+the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License. If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+#### 1. Source Code.
+
+The "source code" for a work means the preferred form of the work for
+making modifications to it. "Object code" means any non-source form of
+a work.
+
+A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form. A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities. However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work. For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+The Corresponding Source need not include anything that users can
+regenerate automatically from other parts of the Corresponding Source.
+
+The Corresponding Source for a work in source code form is that same
+work.
+
+#### 2. Basic Permissions.
+
+All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met. This License explicitly affirms your unlimited
+permission to run the unmodified Program. The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work. This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+You may make, run and propagate covered works that you do not convey,
+without conditions so long as your license otherwise remains in force.
+You may convey covered works to others for the sole purpose of having
+them make modifications exclusively for you, or provide you with
+facilities for running those works, provided that you comply with the
+terms of this License in conveying all material for which you do not
+control copyright. Those thus making or running the covered works for
+you must do so exclusively on your behalf, under your direction and
+control, on terms that prohibit them from making any copies of your
+copyrighted material outside their relationship with you.
+
+Conveying under any other circumstances is permitted solely under the
+conditions stated below. Sublicensing is not allowed; section 10 makes
+it unnecessary.
+
+#### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such
+circumvention is effected by exercising rights under this License with
+respect to the covered work, and you disclaim any intention to limit
+operation or modification of the work as a means of enforcing, against
+the work's users, your or third parties' legal rights to forbid
+circumvention of technological measures.
+
+#### 4. Conveying Verbatim Copies.
+
+You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+#### 5. Conveying Modified Source Versions.
+
+You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these
+conditions:
+
+-   a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+-   b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under
+    section 7. This requirement modifies the requirement in section 4
+    to "keep intact all notices".
+-   c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy. This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged. This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+-   d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit. Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+#### 6. Conveying Non-Source Forms.
+
+You may convey a covered work in object code form under the terms of
+sections 4 and 5, provided that you also convey the machine-readable
+Corresponding Source under the terms of this License, in one of these
+ways:
+
+-   a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+-   b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the Corresponding
+    Source from a network server at no charge.
+-   c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source. This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+-   d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge. You need not require recipients to copy the
+    Corresponding Source along with the object code. If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source. Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+-   e) Convey the object code using peer-to-peer transmission,
+    provided you inform other peers where the object code and
+    Corresponding Source of the work are being offered to the general
+    public at no charge under subsection 6d.
+
+A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal,
+family, or household purposes, or (2) anything designed or sold for
+incorporation into a dwelling. In determining whether a product is a
+consumer product, doubtful cases shall be resolved in favor of
+coverage. For a particular product received by a particular user,
+"normally used" refers to a typical or common use of that class of
+product, regardless of the status of the particular user or of the way
+in which the particular user actually uses, or expects or is expected
+to use, the product. A product is a consumer product regardless of
+whether the product has substantial commercial, industrial or
+non-consumer uses, unless such uses represent the only significant
+mode of use of the product.
+
+"Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to
+install and execute modified versions of a covered work in that User
+Product from a modified version of its Corresponding Source. The
+information must suffice to ensure that the continued functioning of
+the modified object code is in no case prevented or interfered with
+solely because modification has been made.
+
+If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information. But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or
+updates for a work that has been modified or installed by the
+recipient, or for the User Product in which it has been modified or
+installed. Access to a network may be denied when the modification
+itself materially and adversely affects the operation of the network
+or violates the rules and protocols for communication across the
+network.
+
+Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+#### 7. Additional Terms.
+
+"Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law. If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it. (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.) You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders
+of that material) supplement the terms of this License with terms:
+
+-   a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+-   b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+-   c) Prohibiting misrepresentation of the origin of that material,
+    or requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+-   d) Limiting the use for publicity purposes of names of licensors
+    or authors of the material; or
+-   e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+-   f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions
+    of it) with contractual assumptions of liability to the recipient,
+    for any liability that these contractual assumptions directly
+    impose on those licensors and authors.
+
+All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10. If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term. If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions; the
+above requirements apply either way.
+
+#### 8. Termination.
+
+You may not propagate or modify a covered work except as expressly
+provided under this License. Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+#### 9. Acceptance Not Required for Having Copies.
+
+You are not required to accept this License in order to receive or run
+a copy of the Program. Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance. However,
+nothing other than this License grants you permission to propagate or
+modify any covered work. These actions infringe copyright if you do
+not accept this License. Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+#### 10. Automatic Licensing of Downstream Recipients.
+
+Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License. You are not responsible
+for enforcing compliance by third parties with this License.
+
+An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations. If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License. For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+#### 11. Patents.
+
+A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+A contributor's "essential patent claims" are all patent claims owned
+or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+A patent license is "discriminatory" if it does not include within the
+scope of its coverage, prohibits the exercise of, or is conditioned on
+the non-exercise of one or more of the rights that are specifically
+granted under this License. You may not convey a covered work if you
+are a party to an arrangement with a third party that is in the
+business of distributing software, under which you make payment to the
+third party based on the extent of your activity of conveying the
+work, and under which the third party grants, to any of the parties
+who would receive the covered work from you, a discriminatory patent
+license (a) in connection with copies of the covered work conveyed by
+you (or copies made from those copies), or (b) primarily for and in
+connection with specific products or compilations that contain the
+covered work, unless you entered into that arrangement, or that patent
+license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+#### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under
+this License and any other pertinent obligations, then as a
+consequence you may not convey it at all. For example, if you agree to
+terms that obligate you to collect a royalty for further conveying
+from those to whom you convey the Program, the only way you could
+satisfy both those terms and this License would be to refrain entirely
+from conveying the Program.
+
+#### 13. Remote Network Interaction; Use with the GNU General Public License.
+
+Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your
+version supports such interaction) an opportunity to receive the
+Corresponding Source of your version by providing access to the
+Corresponding Source from a network server at no charge, through some
+standard or customary means of facilitating copying of software. This
+Corresponding Source shall include the Corresponding Source for any
+work covered by version 3 of the GNU General Public License that is
+incorporated pursuant to the following paragraph.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+#### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions
+of the GNU Affero General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever
+published by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions
+of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+#### 15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
+WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
+PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+#### 16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
+CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
+NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
+LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
+TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
+PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+#### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+### How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these
+terms.
+
+To do so, attach the following notices to the program. It is safest to
+attach them to the start of each source file to most effectively state
+the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+        <one line to give the program's name and a brief idea of what it does.>
+        Copyright (C) <year>  <name of author>
+
+        This program is free software: you can redistribute it and/or modify
+        it under the terms of the GNU Affero General Public License as
+        published by the Free Software Foundation, either version 3 of the
+        License, or (at your option) any later version.
+
+        This program is distributed in the hope that it will be useful,
+        but WITHOUT ANY WARRANTY; without even the implied warranty of
+        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+        GNU Affero General Public License for more details.
+
+        You should have received a copy of the GNU Affero General Public License
+        along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper
+mail.
+
+If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for
+the specific requirements.
+
+You should also get your employer (if you work as a programmer) or
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. For more information on this, and how to apply and follow
+the GNU AGPL, see <https://www.gnu.org/licenses/>.

LICENSE.GPL-3.md

@@ -0,0 +1,675 @@
+### GNU GENERAL PUBLIC LICENSE
+
+Version 3, 29 June 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc.
+<https://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+### Preamble
+
+The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+the GNU General Public License is intended to guarantee your freedom
+to share and change all versions of a program--to make sure it remains
+free software for all its users. We, the Free Software Foundation, use
+the GNU General Public License for most of our software; it applies
+also to any other work released this way by its authors. You can apply
+it to your programs, too.
+
+When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights. Therefore, you
+have certain responsibilities if you distribute copies of the
+software, or if you modify it: responsibilities to respect the freedom
+of others.
+
+For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received. You must make sure that they, too, receive
+or can get the source code. And you must show them these terms so they
+know their rights.
+
+Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software. For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+Some devices are designed to deny users access to install or run
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+manufacturer can do so. This is fundamentally incompatible with the
+aim of protecting users' freedom to change the software. The
+systematic pattern of such abuse occurs in the area of products for
+individuals to use, which is precisely where it is most unacceptable.
+Therefore, we have designed this version of the GPL to prohibit the
+practice for those products. If such problems arise substantially in
+other domains, we stand ready to extend this provision to those
+domains in future versions of the GPL, as needed to protect the
+freedom of users.
+
+Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish
+to avoid the special danger that patents applied to a free program
+could make it effectively proprietary. To prevent this, the GPL
+assures that patents cannot be used to render the program non-free.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+### TERMS AND CONDITIONS
+
+#### 0. Definitions.
+
+"This License" refers to version 3 of the GNU General Public License.
+
+"Copyright" also means copyright-like laws that apply to other kinds
+of works, such as semiconductor masks.
+
+"The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
+"recipients" may be individuals or organizations.
+
+To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of
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+the earlier work or a work "based on" the earlier work.
+
+A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy. Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies. Mere interaction with a user
+through a computer network, with no transfer of a copy, is not
+conveying.
+
+An interactive user interface displays "Appropriate Legal Notices" to
+the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License. If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+#### 1. Source Code.
+
+The "source code" for a work means the preferred form of the work for
+making modifications to it. "Object code" means any non-source form of
+a work.
+
+A "Standard Interface" means an interface that either is an official
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+The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
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+(kernel, window system, and so on) of the specific operating system
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+produce the work, or an object code interpreter used to run it.
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+The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
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+includes interface definition files associated with source files for
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+
+The Corresponding Source need not include anything that users can
+regenerate automatically from other parts of the Corresponding Source.
+
+The Corresponding Source for a work in source code form is that same
+work.
+
+#### 2. Basic Permissions.
+
+All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met. This License explicitly affirms your unlimited
+permission to run the unmodified Program. The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work. This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+You may make, run and propagate covered works that you do not convey,
+without conditions so long as your license otherwise remains in force.
+You may convey covered works to others for the sole purpose of having
+them make modifications exclusively for you, or provide you with
+facilities for running those works, provided that you comply with the
+terms of this License in conveying all material for which you do not
+control copyright. Those thus making or running the covered works for
+you must do so exclusively on your behalf, under your direction and
+control, on terms that prohibit them from making any copies of your
+copyrighted material outside their relationship with you.
+
+Conveying under any other circumstances is permitted solely under the
+conditions stated below. Sublicensing is not allowed; section 10 makes
+it unnecessary.
+
+#### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such
+circumvention is effected by exercising rights under this License with
+respect to the covered work, and you disclaim any intention to limit
+operation or modification of the work as a means of enforcing, against
+the work's users, your or third parties' legal rights to forbid
+circumvention of technological measures.
+
+#### 4. Conveying Verbatim Copies.
+
+You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+#### 5. Conveying Modified Source Versions.
+
+You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these
+conditions:
+
+-   a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+-   b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under
+    section 7. This requirement modifies the requirement in section 4
+    to "keep intact all notices".
+-   c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy. This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged. This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+-   d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit. Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+#### 6. Conveying Non-Source Forms.
+
+You may convey a covered work in object code form under the terms of
+sections 4 and 5, provided that you also convey the machine-readable
+Corresponding Source under the terms of this License, in one of these
+ways:
+
+-   a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+-   b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the Corresponding
+    Source from a network server at no charge.
+-   c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source. This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+-   d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
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+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source. Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+-   e) Convey the object code using peer-to-peer transmission,
+    provided you inform other peers where the object code and
+    Corresponding Source of the work are being offered to the general
+    public at no charge under subsection 6d.
+
+A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal,
+family, or household purposes, or (2) anything designed or sold for
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+to use, the product. A product is a consumer product regardless of
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+
+"Installation Information" for a User Product means any methods,
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+install and execute modified versions of a covered work in that User
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+information must suffice to ensure that the continued functioning of
+the modified object code is in no case prevented or interfered with
+solely because modification has been made.
+
+If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information. But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or
+updates for a work that has been modified or installed by the
+recipient, or for the User Product in which it has been modified or
+installed. Access to a network may be denied when the modification
+itself materially and adversely affects the operation of the network
+or violates the rules and protocols for communication across the
+network.
+
+Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+#### 7. Additional Terms.
+
+"Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law. If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it. (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.) You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders
+of that material) supplement the terms of this License with terms:
+
+-   a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+-   b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+-   c) Prohibiting misrepresentation of the origin of that material,
+    or requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+-   d) Limiting the use for publicity purposes of names of licensors
+    or authors of the material; or
+-   e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+-   f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions
+    of it) with contractual assumptions of liability to the recipient,
+    for any liability that these contractual assumptions directly
+    impose on those licensors and authors.
+
+All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10. If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term. If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions; the
+above requirements apply either way.
+
+#### 8. Termination.
+
+You may not propagate or modify a covered work except as expressly
+provided under this License. Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+#### 9. Acceptance Not Required for Having Copies.
+
+You are not required to accept this License in order to receive or run
+a copy of the Program. Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance. However,
+nothing other than this License grants you permission to propagate or
+modify any covered work. These actions infringe copyright if you do
+not accept this License. Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+#### 10. Automatic Licensing of Downstream Recipients.
+
+Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License. You are not responsible
+for enforcing compliance by third parties with this License.
+
+An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations. If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License. For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+#### 11. Patents.
+
+A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+A contributor's "essential patent claims" are all patent claims owned
+or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+A patent license is "discriminatory" if it does not include within the
+scope of its coverage, prohibits the exercise of, or is conditioned on
+the non-exercise of one or more of the rights that are specifically
+granted under this License. You may not convey a covered work if you
+are a party to an arrangement with a third party that is in the
+business of distributing software, under which you make payment to the
+third party based on the extent of your activity of conveying the
+work, and under which the third party grants, to any of the parties
+who would receive the covered work from you, a discriminatory patent
+license (a) in connection with copies of the covered work conveyed by
+you (or copies made from those copies), or (b) primarily for and in
+connection with specific products or compilations that contain the
+covered work, unless you entered into that arrangement, or that patent
+license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+#### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under
+this License and any other pertinent obligations, then as a
+consequence you may not convey it at all. For example, if you agree to
+terms that obligate you to collect a royalty for further conveying
+from those to whom you convey the Program, the only way you could
+satisfy both those terms and this License would be to refrain entirely
+from conveying the Program.
+
+#### 13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+#### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions
+of the GNU General Public License from time to time. Such new versions
+will be similar in spirit to the present version, but may differ in
+detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies that a certain numbered version of the GNU General Public
+License "or any later version" applies to it, you have the option of
+following the terms and conditions either of that numbered version or
+of any later version published by the Free Software Foundation. If the
+Program does not specify a version number of the GNU General Public
+License, you may choose any version ever published by the Free
+Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions
+of the GNU General Public License can be used, that proxy's public
+statement of acceptance of a version permanently authorizes you to
+choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+#### 15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
+WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
+PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+#### 16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
+CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
+NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
+LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
+TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
+PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+#### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+### How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these
+terms.
+
+To do so, attach the following notices to the program. It is safest to
+attach them to the start of each source file to most effectively state
+the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+        <one line to give the program's name and a brief idea of what it does.>
+        Copyright (C) <year>  <name of author>
+
+        This program is free software: you can redistribute it and/or modify
+        it under the terms of the GNU General Public License as published by
+        the Free Software Foundation, either version 3 of the License, or
+        (at your option) any later version.
+
+        This program is distributed in the hope that it will be useful,
+        but WITHOUT ANY WARRANTY; without even the implied warranty of
+        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+        GNU General Public License for more details.
+
+        You should have received a copy of the GNU General Public License
+        along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper
+mail.
+
+If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+        <program>  Copyright (C) <year>  <name of author>
+        This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+        This is free software, and you are welcome to redistribute it
+        under certain conditions; type `show c' for details.
+
+The hypothetical commands \`show w' and \`show c' should show the
+appropriate parts of the General Public License. Of course, your
+program's commands might be different; for a GUI interface, you would
+use an "about box".
+
+You should also get your employer (if you work as a programmer) or
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. For more information on this, and how to apply and follow
+the GNU GPL, see <https://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your
+program into proprietary programs. If your program is a subroutine
+library, you may consider it more useful to permit linking proprietary
+applications with the library. If this is what you want to do, use the
+GNU Lesser General Public License instead of this License. But first,
+please read <https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile

@@ -0,0 +1 @@
+# For additional configs/scripting

README.md

@@ -1,181 +1,33 @@
-# The Mempool Open Source Project
+# The Mempool Open Source Project™ [![mempool](https://img.shields.io/endpoint?url=https://dashboard.cypress.io/badge/simple/ry4br7/master&style=flat-square)](https://dashboard.cypress.io/projects/ry4br7/runs)
 
-Mempool is the fully featured mempool visualizer and block explorer website and API service running on [mempool.space](https://mempool.space/). The instructions below are for most users at home running on low-powered Raspberry Pi devices, but if you want to run a production website on a powerful server, see the [production setup guide](https://github.com/mempool/mempool/tree/master/production)
+Mempool is the fully-featured mempool visualizer, explorer, and API service running at [mempool.space](https://mempool.space/). 
 
-![mempool](https://pbs.twimg.com/media/Ei8p_flUcAEjfXE?format=jpg&name=4096x4096)
+It is an open-source project developed and operated for the benefit of the Bitcoin community, with a focus on the emerging transaction fee market that is evolving Bitcoin into a multi-layer ecosystem.
 
-# Installation
+![mempool](https://mempool.space/resources/screenshots/v2.4.0-dashboard.png)
 
-## Dependencies
+# Installation Methods
 
-* Bitcoin Core (no pruning, txindex=1)
-* Electrum Server (romanz/electrs)
-* NodeJS (official stable LTS)
-* MariaDB (default config)
-* Nginx (use supplied nginx.conf and nginx-mempool.conf)
+Mempool can be self-hosted on a wide variety of your own hardware, ranging from a simple one-click installation on a Raspberry Pi full-node distro all the way to a robust production instance on a powerful FreeBSD server. 
 
-## Mempool
+**Most people should use a one-click install method.** Other install methods are meant for developers and others with experience managing servers. 
 
-Clone the mempool repo, and checkout the latest release tag:
-```bash
-  git clone https://github.com/mempool/mempool
-  cd mempool
-  latestrelease=$(curl -s https://api.github.com/repos/mempool/mempool/releases/latest|grep tag_name|head -1|cut -d '"' -f4)
-  git checkout $latestrelease
-```
+<a id="one-click-installation"></a>
+## One-Click Installation
 
-## Bitcoin Core (bitcoind)
+Mempool can be conveniently installed on the following full-node distros: 
+- [Umbrel](https://github.com/getumbrel/umbrel)
+- [RaspiBlitz](https://github.com/rootzoll/raspiblitz)
+- [RoninDojo](https://code.samourai.io/ronindojo/RoninDojo)
+- [myNode](https://github.com/mynodebtc/mynode)
+- [Start9](https://github.com/Start9Labs/embassy-os)
 
-Enable RPC and txindex in `bitcoin.conf`:
-```bash
-  rpcuser=mempool
-  rpcpassword=71b61986da5b03a5694d7c7d5165ece5
-  txindex=1
-```
+**We highly recommend you deploy your own Mempool instance this way.** No matter which option you pick, you'll be able to get your own fully-sovereign instance of Mempool up quickly without needing to fiddle with any settings.
 
-## MySQL
+## Advanced Installation Methods
 
-Install MariaDB from OS package manager:
-```bash
-  # Linux
-  apt-get install mariadb-server mariadb-client
+Mempool can be installed in other ways too, but we only recommend doing so if you're a developer, have experience managing servers, or otherwise know what you're doing.
 
-  # macOS
-  brew install mariadb
-  brew services start mariadb
-```
-
-Create database and grant privileges:
-```bash
-  MariaDB [(none)]> drop database mempool;
-  Query OK, 0 rows affected (0.00 sec)
-
-  MariaDB [(none)]> create database mempool;
-  Query OK, 1 row affected (0.00 sec)
-
-  MariaDB [(none)]> grant all privileges on mempool.* to 'mempool' identified by 'mempool';
-  Query OK, 0 rows affected (0.00 sec)
-```
-
-From the mempool repo's top-level folder, import the database structure:
-```bash
-  mysql -u mempool -p mempool < mariadb-structure.sql
-```
-
-## Mempool Backend
-Install mempool dependencies from npm and build the backend:
-
-```bash
-  # backend
-  cd ../backend/
-  npm install
-  npm run build
-```
-
-In the `backend` folder, make a copy of the sample config and modify it to fit your settings.
-
-```bash
-  cp mempool-config.sample.json mempool-config.json
-```
-
-Edit `mempool-config.json` to add your Bitcoin Core node RPC credentials:
-```bash
-{
-  "MEMPOOL": {
-    "NETWORK": "mainnet",
-    "BACKEND": "electrum",
-    "HTTP_PORT": 8999,
-    "API_URL_PREFIX": "/api/v1/",
-    "POLL_RATE_MS": 2000
-  },
-  "CORE_RPC": {
-    "USERNAME": "mempool",
-    "PASSWORD": "71b61986da5b03a5694d7c7d5165ece5"
-  },
-  "ELECTRUM": {
-    "HOST": "127.0.0.1",
-    "PORT": 50002,
-    "TLS_ENABLED": true,
-    "TX_LOOKUPS": false
-  },
-  "DATABASE": {
-    "ENABLED": true,
-    "HOST": "localhost",
-    "PORT": 3306,
-    "USERNAME": "mempool",
-    "PASSWORD": "mempool",
-    "DATABASE": "mempool"
-  },
-  "STATISTICS": {
-    "ENABLED": true,
-    "TX_PER_SECOND_SAMPLE_PERIOD": 150
-  }
-}
-```
-
-Start the backend:
-
-```bash
-  npm run start
-```
-
-When it's running you should see output like this:
-
-```bash
-  Mempool updated in 0.189 seconds
-  Updating mempool
-  Mempool updated in 0.096 seconds
-  Updating mempool
-  Mempool updated in 0.099 seconds
-  Updating mempool
-  Calculated fee for transaction 1 / 10
-  Calculated fee for transaction 2 / 10
-  Calculated fee for transaction 3 / 10
-  Calculated fee for transaction 4 / 10
-  Calculated fee for transaction 5 / 10
-  Calculated fee for transaction 6 / 10
-  Calculated fee for transaction 7 / 10
-  Calculated fee for transaction 8 / 10
-  Calculated fee for transaction 9 / 10
-  Calculated fee for transaction 10 / 10
-  Mempool updated in 0.243 seconds
-  Updating mempool
-```
-
-## Mempool Frontend
-
-Install mempool dependencies from npm and build the frontend static HTML/CSS/JS:
-
-```bash
-  # frontend
-  cd frontend
-  npm install
-  npm run build
-```
-
-Install the output into nginx webroot folder:
-
-```bash
-  sudo rsync -av --delete dist/mempool/ /var/www/html/
-```
-
-## nginx + certbot
-
-Install the supplied nginx.conf and nginx-mempool.conf in /etc/nginx
-
-```bash
-  # install nginx and certbot
-  apt-get install -y nginx python-certbot-nginx
-
-  # install the mempool configuration for nginx
-  cp nginx.conf nginx-mempool.conf /etc/nginx/nginx.conf
-
-  # replace example.com with your domain name
-  certbot --nginx -d example.com
-
-```
-
-If everything went okay you should see the beautiful mempool :grin:
-
-If you get stuck on "loading blocks", this means the websocket can't connect.
-Check your nginx proxy setup, firewalls, etc. and open an issue if you need help.
+- See the [`docker/`](./docker/) directory for instructions on deploying Mempool with Docker.
+- See the [`backend/`](./backend/) and [`frontend/`](./frontend/) directories for manual install instructions oriented for developers.
+- See the [`production/`](./production/) directory for guidance on setting up a more serious Mempool instance designed for high performance at scale.

backend/.editorconfig

@@ -0,0 +1,17 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false
+

backend/.eslintignore

@@ -0,0 +1,2 @@
+node_modules
+dist

backend/.eslintrc

@@ -0,0 +1,36 @@
+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "rules": {
+    "@typescript-eslint/ban-ts-comment": 1,
+    "@typescript-eslint/ban-types": 1,
+    "@typescript-eslint/no-empty-function": 1,
+    "@typescript-eslint/no-explicit-any": 1,
+    "@typescript-eslint/no-inferrable-types": 0,
+    "@typescript-eslint/no-namespace": 1,
+    "@typescript-eslint/no-this-alias": 1,
+    "@typescript-eslint/no-var-requires": 1,
+    "@typescript-eslint/explicit-function-return-type": 1,
+    "no-console": 1,
+    "no-constant-condition": 1,
+    "no-dupe-else-if": 1,
+    "no-empty": 1,
+    "no-prototype-builtins": 1,
+    "no-self-assign": 1,
+    "no-useless-catch": 1,
+    "no-var": 1,
+    "prefer-const": 1,
+    "prefer-rest-params": 1,
+    "quotes": [1, "single", { "allowTemplateLiterals": true }],
+    "semi": 1
+  }
+}

backend/.gitignore

@@ -1,7 +1,10 @@
 # See http://help.github.com/ignore-files/ for more about ignoring files.
 
-# production config
+# production config and external assets
+
 mempool-config.json
+pools.json
+icons.json
 
 # compiled output
 /dist
@@ -41,6 +44,3 @@ testem.log
 #System Files
 .DS_Store
 Thumbs.db
-
-cache.json
-cache2.json

backend/.prettierignore

@@ -0,0 +1,2 @@
+node_modules
+package-lock.json

backend/.prettierrc

@@ -0,0 +1,6 @@
+{
+  "endOfLine": "lf",
+  "printWidth": 80,
+  "tabWidth": 2,
+  "trailingComma": "es5"
+}

backend/.vscode/settings.json

@@ -0,0 +1,4 @@
+{
+  "editor.tabSize": 2,
+  "typescript.tsdk": "../backend/node_modules/typescript/lib"
+}

backend/README.md

@@ -0,0 +1,215 @@
+# Mempool Backend
+
+These instructions are mostly intended for developers. 
+
+If you choose to use these instructions for a production setup, be aware that you will still probably need to do additional configuration for your specific OS, environment, use-case, etc. We do our best here to provide a good starting point, but only proceed if you know what you're doing. Mempool does not provide support for custom setups.
+
+See other ways to set up Mempool on [the main README](/../../#installation-methods).
+
+Jump to a section in this doc:
+- [Set Up the Backend](#setup)
+- [Development Tips](#development-tips)
+
+## Setup
+
+### 1. Clone Mempool Repository
+
+Get the latest Mempool code:
+
+```
+git clone https://github.com/mempool/mempool
+cd mempool
+```
+
+Check out the latest release:
+
+```
+latestrelease=$(curl -s https://api.github.com/repos/mempool/mempool/releases/latest|grep tag_name|head -1|cut -d '"' -f4)
+git checkout $latestrelease
+```
+
+### 2. Configure Bitcoin Core
+
+Turn on `txindex`, enable RPC, and set RPC credentials in `bitcoin.conf`:
+
+```
+txindex=1
+server=1
+rpcuser=mempool
+rpcpassword=mempool
+```
+
+### 3. Configure Electrum Server
+
+[Pick an Electrum Server implementation](https://mempool.space/docs/faq#address-lookup-issues), configure it, and make sure it's synced.
+
+**This step is optional.** You can run Mempool without configuring an Electrum Server for it, but address lookups will be disabled.
+
+### 4. Configure MariaDB
+
+_Mempool needs MariaDB v10.5 or later. If you already have MySQL installed, make sure to migrate any existing databases **before** installing MariaDB._
+
+Get MariaDB from your operating system's package manager:
+
+```
+# Debian, Ubuntu, etc.
+apt-get install mariadb-server mariadb-client
+
+# macOS
+brew install mariadb
+mysql.server start
+```
+
+Create a database and grant privileges:
+
+```
+MariaDB [(none)]> drop database mempool;
+Query OK, 0 rows affected (0.00 sec)
+
+MariaDB [(none)]> create database mempool;
+Query OK, 1 row affected (0.00 sec)
+
+MariaDB [(none)]> grant all privileges on mempool.* to 'mempool'@'%' identified by 'mempool';
+Query OK, 0 rows affected (0.00 sec)
+```
+
+### 5. Prepare Mempool Backend
+
+#### Build
+
+_Make sure to use Node.js 16.10 and npm 7._
+
+Install dependencies with `npm` and build the backend:
+
+```
+cd backend
+npm install
+npm run build
+```
+
+#### Configure
+
+In the backend folder, make a copy of the sample config file:
+
+```
+cp mempool-config.sample.json mempool-config.json
+```
+
+Edit `mempool-config.json` as needed. 
+
+In particular, make sure:
+- the correct Bitcoin Core RPC credentials are specified in `CORE_RPC`
+- the correct `BACKEND` is specified in `MEMPOOL`:
+  - "electrum" if you're using [romanz/electrs](https://github.com/romanz/electrs) or [cculianu/Fulcrum](https://github.com/cculianu/Fulcrum)
+  - "esplora" if you're using [Blockstream/electrs](https://github.com/Blockstream/electrs)
+  - "none" if you're not using any Electrum Server
+
+### 6. Run Mempool Backend
+
+Run the Mempool backend:
+
+```
+npm run start
+```
+
+When it's running, you should see output like this:
+
+```
+Mempool updated in 0.189 seconds
+Updating mempool
+Mempool updated in 0.096 seconds
+Updating mempool
+Mempool updated in 0.099 seconds
+Updating mempool
+Calculated fee for transaction 1 / 10
+Calculated fee for transaction 2 / 10
+Calculated fee for transaction 3 / 10
+Calculated fee for transaction 4 / 10
+Calculated fee for transaction 5 / 10
+Calculated fee for transaction 6 / 10
+Calculated fee for transaction 7 / 10
+Calculated fee for transaction 8 / 10
+Calculated fee for transaction 9 / 10
+Calculated fee for transaction 10 / 10
+Mempool updated in 0.243 seconds
+Updating mempool
+```
+
+### 7. Set Up Mempool Frontend
+With the backend configured and running, proceed to set up the [Mempool frontend](../frontend#manual-setup).
+
+## Development Tips
+
+### Set Up Backend Watchers
+
+The Mempool backend is static. TypeScript scripts are compiled into the `dist` folder and served through a Node.js web server. 
+
+As a result, for development purposes, you may find it helpful to set up backend watchers to avoid the manual shutdown/recompile/restart command-line cycle.
+
+First, install `nodemon` and `ts-node`:
+
+```
+npm install -g ts-node nodemon
+```
+
+Then, run the watcher:
+
+```
+nodemon src/index.ts --ignore cache/ --ignore pools.json
+```
+
+`nodemon` should be in npm's global binary folder. If needed, you can determine where that is with `npm -g bin`.
+
+### Useful Regtest Commands
+
+Helpful link: https://gist.github.com/System-Glitch/cb4e87bf1ae3fec9925725bb3ebe223a
+
+Run bitcoind on regtest:
+   ```
+   bitcoind -regtest -rpcport=8332
+   ```
+
+Create a new wallet, if needed:
+   ```
+   bitcoin-cli -regtest -rpcport=8332 createwallet test
+   ```
+
+Load wallet (this command may take a while if you have lot of UTXOs):
+   ```
+   bitcoin-cli -regtest -rpcport=8332 loadwallet test
+   ```
+
+Get a new address:
+   ```
+   address=$(./src/bitcoin-cli -regtest -rpcport=8332 getnewaddress)
+   ```
+
+Mine blocks to the previously generated address. You need at least 101 blocks before you can spend. This will take some time to execute (~1 min):
+   ```
+   bitcoin-cli -regtest -rpcport=8332 generatetoaddress 101 $address
+   ```
+
+Send 0.1 BTC at 5 sat/vB to another address:
+   ```
+   ./src/bitcoin-cli -named -regtest -rpcport=8332 sendtoaddress address=$(./src/bitcoin-cli -regtest -rpcport=8332 getnewaddress) amount=0.1 fee_rate=5
+   ```
+
+See more example of `sendtoaddress`:
+   ```
+   ./src/bitcoin-cli sendtoaddress # will print the help
+   ```
+
+Mini script to generate transactions with random TX fee-rate (between 1 to 100 sat/vB). It's slow so don't expect to use this to test mempool spam, except if you let it run for a long time, or maybe with multiple regtest nodes connected to each other.
+   ```
+   #!/bin/bash
+   address=$(./src/bitcoin-cli -regtest -rpcport=8332 getnewaddress)
+   for i in {1..1000000}
+   do
+     ./src/bitcoin-cli -regtest -rpcport=8332 -named sendtoaddress address=$address amount=0.01 fee_rate=$(jot -r 1  1 100)
+   done
+   ```
+
+Generate block at regular interval (every 10 seconds in this example):
+   ```
+   watch -n 10 "./src/bitcoin-cli -regtest -rpcport=8332 generatetoaddress 1 $address"
+   ```

backend/cache/.gitignore

@@ -0,0 +1 @@
+*.json

backend/mempool-config.sample.json

@@ -5,7 +5,23 @@
     "HTTP_PORT": 8999,
     "SPAWN_CLUSTER_PROCS": 0,
     "API_URL_PREFIX": "/api/v1/",
-    "POLL_RATE_MS": 2000
+    "POLL_RATE_MS": 2000,
+    "CACHE_DIR": "./cache",
+    "CLEAR_PROTECTION_MINUTES": 20,
+    "RECOMMENDED_FEE_PERCENTILE": 50,
+    "BLOCK_WEIGHT_UNITS": 4000000,
+    "INITIAL_BLOCKS_AMOUNT": 8,
+    "MEMPOOL_BLOCKS_AMOUNT": 8,
+    "INDEXING_BLOCKS_AMOUNT": 11000,
+    "BLOCKS_SUMMARIES_INDEXING": false,
+    "PRICE_FEED_UPDATE_INTERVAL": 600,
+    "USE_SECOND_NODE_FOR_MINFEE": false,
+    "EXTERNAL_ASSETS": [],
+    "EXTERNAL_MAX_RETRY": 1,
+    "EXTERNAL_RETRY_INTERVAL": 0,
+    "USER_AGENT": "mempool",
+    "STDOUT_LOG_MIN_PRIORITY": "debug",
+    "AUTOMATIC_BLOCK_REINDEXING": false
   },
   "CORE_RPC": {
     "HOST": "127.0.0.1",
@@ -16,37 +32,74 @@
   "ELECTRUM": {
     "HOST": "127.0.0.1",
     "PORT": 50002,
-    "TLS_ENABLED": true,
-    "TX_LOOKUPS": false
+    "TLS_ENABLED": true
   },
   "ESPLORA": {
     "REST_API_URL": "http://127.0.0.1:3000"
   },
+  "SECOND_CORE_RPC": {
+    "HOST": "127.0.0.1",
+    "PORT": 8332,
+    "USERNAME": "mempool",
+    "PASSWORD": "mempool"
+  },
   "DATABASE": {
     "ENABLED": true,
     "HOST": "127.0.0.1",
     "PORT": 3306,
+    "SOCKET": "/var/run/mysql/mysql.sock",
     "DATABASE": "mempool",
     "USERNAME": "mempool",
     "PASSWORD": "mempool"
   },
+  "SYSLOG": {
+    "ENABLED": true,
+    "HOST": "127.0.0.1",
+    "PORT": 514,
+    "MIN_PRIORITY": "info",
+    "FACILITY": "local7"
+  },
   "STATISTICS": {
     "ENABLED": true,
     "TX_PER_SECOND_SAMPLE_PERIOD": 150
   },
-  "BISQ_BLOCKS": {
+  "MAXMIND": {
     "ENABLED": false,
-    "DATA_PATH": "/bisq/statsnode-data/btc_mainnet/db/json"
+    "GEOLITE2_CITY": "/usr/local/share/GeoIP/GeoLite2-City.mmdb",
+    "GEOLITE2_ASN": "/usr/local/share/GeoIP/GeoLite2-ASN.mmdb",
+    "GEOIP2_ISP": "/usr/local/share/GeoIP/GeoIP2-ISP.mmdb"
   },
-  "BISQ_MARKETS": {
+  "BISQ": {
     "ENABLED": false,
     "DATA_PATH": "/bisq/statsnode-data/btc_mainnet/db"
   },
-  "SPONSORS": {
+  "LIGHTNING": {
     "ENABLED": false,
-    "BTCPAY_URL": "",
-    "BTCPAY_AUTH": "",
-    "BTCPAY_WEBHOOK_URL": "",
-    "TWITTER_BEARER_AUTH": ""
+    "BACKEND": "lnd"
+  },
+  "LND": {
+    "TLS_CERT_PATH": "tls.cert",
+    "MACAROON_PATH": "admin.macaroon",
+    "SOCKET": "localhost:10009"
+  },
+  "SOCKS5PROXY": {
+    "ENABLED": false,
+    "USE_ONION": true,
+    "HOST": "127.0.0.1",
+    "PORT": 9050,
+    "USERNAME": "",
+    "PASSWORD": ""
+  },
+  "PRICE_DATA_SERVER": {
+    "TOR_URL": "http://wizpriceje6q5tdrxkyiazsgu7irquiqjy2dptezqhrtu7l2qelqktid.onion/getAllMarketPrices",
+    "CLEARNET_URL": "https://price.bisq.wiz.biz/getAllMarketPrices"
+  },
+  "EXTERNAL_DATA_SERVER": {
+    "MEMPOOL_API": "https://mempool.space/api/v1",
+    "MEMPOOL_ONION": "http://mempoolhqx4isw62xs7abwphsq7ldayuidyx2v2oethdhhj6mlo2r6ad.onion/api/v1",
+    "LIQUID_API": "https://liquid.network/api/v1",
+    "LIQUID_ONION": "http://liquidmom47f6s3m53ebfxn47p76a6tlnxib3wp6deux7wuzotdr6cyd.onion/api/v1",
+    "BISQ_URL": "https://bisq.markets/api",
+    "BISQ_ONION": "http://bisqmktse2cabavbr2xjq7xw3h6g5ottemo5rolfcwt6aly6tp5fdryd.onion/api"
   }
 }

backend/package.json

@@ -1,8 +1,8 @@
 {
   "name": "mempool-backend",
-  "version": "2.0.0",
+  "version": "2.5.0-dev",
   "description": "Bitcoin mempool visualizer and blockchain explorer backend",
-  "license": "MIT",
+  "license": "GNU Affero General Public License v3.0",
   "homepage": "https://mempool.space",
   "repository": {
     "type": "git",
@@ -20,30 +20,40 @@
   ],
   "main": "index.ts",
   "scripts": {
-    "ng": "./node_modules/@angular/cli/bin/ng",
     "tsc": "./node_modules/typescript/bin/tsc",
     "build": "npm run tsc",
-    "start": "node --max-old-space-size=4096 dist/index.js",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "start": "node --max-old-space-size=2048 dist/index.js",
+    "start-production": "node --max-old-space-size=4096 dist/index.js",
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "lint": "./node_modules/.bin/eslint . --ext .ts",
+    "lint:fix": "./node_modules/.bin/eslint . --ext .ts --fix",
+    "prettier": "./node_modules/.bin/prettier --write \"src/**/*.{js,ts}\""
   },
   "dependencies": {
-    "@mempool/bitcoin": "^3.0.2",
     "@mempool/electrum-client": "^1.1.7",
-    "axios": "^0.21.1",
-    "bitcoinjs-lib": "^5.2.0",
+    "@types/node": "^16.11.41",
+    "axios": "~0.27.2",
+    "bitcoinjs-lib": "6.0.1",
+    "bolt07": "^1.8.1",
     "crypto-js": "^4.0.0",
-    "express": "^4.17.1",
-    "locutus": "^2.0.12",
-    "mysql2": "^1.6.1",
-    "node-worker-threads-pool": "^1.4.2",
-    "ws": "^7.3.1"
+    "express": "^4.18.0",
+    "lightning": "^5.16.3",
+    "maxmind": "^4.3.6",
+    "mysql2": "2.3.3",
+    "node-worker-threads-pool": "^1.5.1",
+    "socks-proxy-agent": "~7.0.0",
+    "typescript": "~4.7.4",
+    "ws": "~8.8.0"
   },
   "devDependencies": {
-    "@types/compression": "^1.0.1",
-    "@types/express": "^4.17.2",
-    "@types/locutus": "^0.0.6",
-    "@types/ws": "^6.0.4",
-    "tslint": "~6.1.0",
-    "typescript": "~3.9.7"
+    "@types/compression": "^1.7.2",
+    "@types/crypto-js": "^4.1.1",
+    "@types/express": "^4.17.13",
+    "@types/ws": "~8.5.3",
+    "@typescript-eslint/eslint-plugin": "^5.30.5",
+    "@typescript-eslint/parser": "^5.30.5",
+    "eslint": "^8.19.0",
+    "eslint-config-prettier": "^8.5.0",
+    "prettier": "^2.7.1"
   }
 }

backend/src/api/backend-info.ts

@@ -1,20 +1,25 @@
 import * as fs from 'fs';
 import * as os from 'os';
 import logger from '../logger';
+import { IBackendInfo } from '../mempool.interfaces';
+const { spawnSync } = require('child_process');
 
 class BackendInfo {
-  gitCommitHash = '';
-  hostname = '';
+  private gitCommitHash = '';
+  private hostname = '';
+  private version = '';
 
   constructor() {
     this.setLatestCommitHash();
+    this.setVersion();
     this.hostname = os.hostname();
   }
 
-  public getBackendInfo() {
+  public getBackendInfo(): IBackendInfo {
     return {
-      'hostname': this.hostname,
-      'git-commit': this.gitCommitHash,
+      hostname: this.hostname,
+      gitCommit: this.gitCommitHash,
+      version: this.version,
     };
   }
 
@@ -23,10 +28,32 @@ class BackendInfo {
   }
 
   private setLatestCommitHash(): void {
+    //TODO: share this logic with `generate-config.js`
+    if (process.env.DOCKER_COMMIT_HASH) {
+      this.gitCommitHash = process.env.DOCKER_COMMIT_HASH;
+    } else {
+      try {
+        const gitRevParse = spawnSync('git', ['rev-parse', '--short', 'HEAD']);
+        if (!gitRevParse.error) {
+          const output = gitRevParse.stdout.toString('utf-8').replace(/[\n\r\s]+$/, '');
+          this.gitCommitHash = output ? output : '?';
+        } else if (gitRevParse.error.code === 'ENOENT') {
+          console.log('git not found, cannot parse git hash');
+          this.gitCommitHash = '?';
+        }
+      } catch (e: any) {
+        console.log('Could not load git commit info: ' + e.message);
+        this.gitCommitHash = '?';
+      }
+    }
+  }
+
+  private setVersion(): void {
     try {
-      this.gitCommitHash = fs.readFileSync('../.git/refs/heads/master').toString().trim();
+      const packageJson = fs.readFileSync('package.json').toString();
+      this.version = JSON.parse(packageJson).version;
     } catch (e) {
-      logger.err('Could not load git commit info: ' + e.message || e);
+      throw new Error(e instanceof Error ? e.message : 'Error');
     }
   }
 }

backend/src/api/bisq/bisq.routes.ts

@@ -0,0 +1,381 @@
+import { Application, Request, Response } from 'express';
+import config from '../../config';
+import { RequiredSpec } from '../../mempool.interfaces';
+import bisq from './bisq';
+import { MarketsApiError } from './interfaces';
+import marketsApi from './markets-api';
+
+class BisqRoutes {
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/stats', this.getBisqStats)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/tx/:txId', this.getBisqTransaction)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/block/:hash', this.getBisqBlock)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/blocks/tip/height', this.getBisqTip)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/blocks/:index/:length', this.getBisqBlocks)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/address/:address', this.getBisqAddress)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/txs/:index/:length', this.getBisqTransactions)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/currencies', this.getBisqMarketCurrencies.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/depth', this.getBisqMarketDepth.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/hloc', this.getBisqMarketHloc.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/markets', this.getBisqMarketMarkets.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/offers', this.getBisqMarketOffers.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/ticker', this.getBisqMarketTicker.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/trades', this.getBisqMarketTrades.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/volumes', this.getBisqMarketVolumes.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/volumes/7d', this.getBisqMarketVolumes7d.bind(this))
+    ;
+  }
+
+
+  private getBisqStats(req: Request, res: Response) {
+    const result = bisq.getStats();
+    res.json(result);
+  }
+
+  private getBisqTip(req: Request, res: Response) {
+    const result = bisq.getLatestBlockHeight();
+    res.type('text/plain');
+    res.send(result.toString());
+  }
+
+  private getBisqTransaction(req: Request, res: Response) {
+    const result = bisq.getTransaction(req.params.txId);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(404).send('Bisq transaction not found');
+    }
+  }
+
+  private getBisqTransactions(req: Request, res: Response) {
+    const types: string[] = [];
+    req.query.types = req.query.types || [];
+    if (!Array.isArray(req.query.types)) {
+      res.status(500).send('Types is not an array');
+      return;
+    }
+
+    for (const _type in req.query.types) {
+      if (typeof req.query.types[_type] === 'string') {
+        types.push(req.query.types[_type].toString());
+      }
+    }
+
+    const index = parseInt(req.params.index, 10) || 0;
+    const length = parseInt(req.params.length, 10) > 100 ? 100 : parseInt(req.params.length, 10) || 25;
+    const [transactions, count] = bisq.getTransactions(index, length, types);
+    res.header('X-Total-Count', count.toString());
+    res.json(transactions);
+  }
+
+  private getBisqBlock(req: Request, res: Response) {
+    const result = bisq.getBlock(req.params.hash);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(404).send('Bisq block not found');
+    }
+  }
+
+  private getBisqBlocks(req: Request, res: Response) {
+    const index = parseInt(req.params.index, 10) || 0;
+    const length = parseInt(req.params.length, 10) > 100 ? 100 : parseInt(req.params.length, 10) || 25;
+    const [transactions, count] = bisq.getBlocks(index, length);
+    res.header('X-Total-Count', count.toString());
+    res.json(transactions);
+  }
+
+  private getBisqAddress(req: Request, res: Response) {
+    const result = bisq.getAddress(req.params.address.substr(1));
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(404).send('Bisq address not found');
+    }
+  }
+
+  private getBisqMarketCurrencies(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'type': {
+        required: false,
+        types: ['crypto', 'fiat', 'all']
+      },
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getCurrencies(p.type);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketCurrencies error'));
+    }
+  }
+
+  private getBisqMarketDepth(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'market': {
+        required: true,
+        types: ['@string']
+      },
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getDepth(p.market);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketDepth error'));
+    }
+  }
+
+  private getBisqMarketMarkets(req: Request, res: Response) {
+    const result = marketsApi.getMarkets();
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketMarkets error'));
+    }
+  }
+
+  private getBisqMarketTrades(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'market': {
+        required: true,
+        types: ['@string']
+      },
+      'timestamp_from': {
+        required: false,
+        types: ['@number']
+      },
+      'timestamp_to': {
+        required: false,
+        types: ['@number']
+      },
+      'trade_id_to': {
+        required: false,
+        types: ['@string']
+      },
+      'trade_id_from': {
+        required: false,
+        types: ['@string']
+      },
+      'direction': {
+        required: false,
+        types: ['buy', 'sell']
+      },
+      'limit': {
+        required: false,
+        types: ['@number']
+      },
+      'sort': {
+        required: false,
+        types: ['asc', 'desc']
+      }
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getTrades(p.market, p.timestamp_from,
+      p.timestamp_to, p.trade_id_from, p.trade_id_to, p.direction, p.limit, p.sort);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketTrades error'));
+    }
+  }
+
+  private getBisqMarketOffers(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'market': {
+        required: true,
+        types: ['@string']
+      },
+      'direction': {
+        required: false,
+        types: ['buy', 'sell']
+      },
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getOffers(p.market, p.direction);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketOffers error'));
+    }
+  }
+
+  private getBisqMarketVolumes(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'market': {
+        required: false,
+        types: ['@string']
+      },
+      'interval': {
+        required: false,
+        types: ['minute', 'half_hour', 'hour', 'half_day', 'day', 'week', 'month', 'year', 'auto']
+      },
+      'timestamp_from': {
+        required: false,
+        types: ['@number']
+      },
+      'timestamp_to': {
+        required: false,
+        types: ['@number']
+      },
+      'milliseconds': {
+        required: false,
+        types: ['@boolean']
+      },
+      'timestamp': {
+        required: false,
+        types: ['no', 'yes']
+      },
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getVolumes(p.market, p.timestamp_from, p.timestamp_to, p.interval, p.milliseconds, p.timestamp);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketVolumes error'));
+    }
+  }
+
+  private getBisqMarketHloc(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'market': {
+        required: true,
+        types: ['@string']
+      },
+      'interval': {
+        required: false,
+        types: ['minute', 'half_hour', 'hour', 'half_day', 'day', 'week', 'month', 'year', 'auto']
+      },
+      'timestamp_from': {
+        required: false,
+        types: ['@number']
+      },
+      'timestamp_to': {
+        required: false,
+        types: ['@number']
+      },
+      'milliseconds': {
+        required: false,
+        types: ['@boolean']
+      },
+      'timestamp': {
+        required: false,
+        types: ['no', 'yes']
+      },
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getHloc(p.market, p.interval, p.timestamp_from, p.timestamp_to, p.milliseconds, p.timestamp);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketHloc error'));
+    }
+  }
+
+  private getBisqMarketTicker(req: Request, res: Response) {
+    const constraints: RequiredSpec = {
+      'market': {
+        required: false,
+        types: ['@string']
+      },
+    };
+
+    const p = this.parseRequestParameters(req.query, constraints);
+    if (p.error) {
+      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
+      return;
+    }
+
+    const result = marketsApi.getTicker(p.market);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketTicker error'));
+    }
+  }
+
+  private getBisqMarketVolumes7d(req: Request, res: Response) {
+    const result = marketsApi.getVolumesByTime(604800);
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketVolumes7d error'));
+    }
+  }
+
+  private parseRequestParameters(requestParams: object, params: RequiredSpec): { [name: string]: any; } {
+    const final = {};
+    for (const i in params) {
+      if (params.hasOwnProperty(i)) {
+        if (params[i].required && requestParams[i] === undefined) {
+          return { error: i + ' parameter missing'};
+        }
+        if (typeof requestParams[i] === 'string') {
+          const str = (requestParams[i] || '').toString().toLowerCase();
+          if (params[i].types.indexOf('@number') > -1) {
+            const number = parseInt((str).toString(), 10);
+            final[i] = number;
+          } else if (params[i].types.indexOf('@string') > -1) {
+            final[i] = str;
+          } else if (params[i].types.indexOf('@boolean') > -1) {
+            final[i] = str === 'true' || str === 'yes';
+          } else if (params[i].types.indexOf(str) > -1) {
+            final[i] = str;
+          } else {
+            return { error: i + ' parameter invalid'};
+          }
+        } else if (typeof requestParams[i] === 'number') {
+          final[i] = requestParams[i];
+        }
+      }
+    }
+    return final;
+  }
+
+  private getBisqMarketErrorResponse(message: string): MarketsApiError {
+    return {
+      'success': 0,
+      'error': message
+    };
+  }
+
+}
+
+export default new BisqRoutes;

backend/src/api/bisq/bisq.ts

@@ -1,16 +1,21 @@
 import config from '../../config';
 import * as fs from 'fs';
-import axios from 'axios';
+import axios, { AxiosResponse } from 'axios';
+import * as http from 'http';
+import * as https from 'https';
+import { SocksProxyAgent } from 'socks-proxy-agent';
 import { BisqBlocks, BisqBlock, BisqTransaction, BisqStats, BisqTrade } from './interfaces';
 import { Common } from '../common';
 import { BlockExtended } from '../../mempool.interfaces';
 import { StaticPool } from 'node-worker-threads-pool';
+import backendInfo from '../backend-info';
 import logger from '../../logger';
 
 class Bisq {
-  private static BLOCKS_JSON_FILE_PATH = config.BISQ_BLOCKS.DATA_PATH + '/all/blocks.json';
+  private static BLOCKS_JSON_FILE_PATH = config.BISQ.DATA_PATH + '/json/all/blocks.json';
   private latestBlockHeight = 0;
   private blocks: BisqBlock[] = [];
+  private allBlocks: BisqBlock[] = [];
   private transactions: BisqTransaction[] = [];
   private transactionIndex: { [txId: string]: BisqTransaction } = {};
   private blockIndex: { [hash: string]: BisqBlock } = {};
@@ -34,7 +39,13 @@ class Bisq {
   constructor() {}
 
   startBisqService(): void {
-    this.checkForBisqDataFolder();
+    try {
+      this.checkForBisqDataFolder();
+    } catch (e) {
+      logger.info('Retrying to start bisq service in 3 minutes');
+      setTimeout(this.startBisqService.bind(this), 180000);
+      return;
+    }
     this.loadBisqDumpFile();
     setInterval(this.updatePrice.bind(this), 1000 * 60 * 60);
     this.updatePrice();
@@ -43,7 +54,7 @@ class Bisq {
   }
 
   handleNewBitcoinBlock(block: BlockExtended): void {
-    if (block.height - 2 > this.latestBlockHeight && this.latestBlockHeight !== 0) {
+    if (block.height - 10 > this.latestBlockHeight && this.latestBlockHeight !== 0) {
       logger.warn(`Bitcoin block height (#${block.height}) has diverged from the latest Bisq block height (#${this.latestBlockHeight}). Restarting watchers...`);
       this.startTopDirectoryWatcher();
       this.startSubDirectoryWatcher();
@@ -89,7 +100,7 @@ class Bisq {
   private checkForBisqDataFolder() {
     if (!fs.existsSync(Bisq.BLOCKS_JSON_FILE_PATH)) {
       logger.warn(Bisq.BLOCKS_JSON_FILE_PATH + ` doesn't exist. Make sure Bisq is running and the config is correct before starting the server.`);
-      return process.exit(1);
+      throw new Error(`Cannot load BISQ ${Bisq.BLOCKS_JSON_FILE_PATH} file`);
     }
   }
 
@@ -98,7 +109,7 @@ class Bisq {
       this.topDirectoryWatcher.close();
     }
     let fsWait: NodeJS.Timeout | null = null;
-    this.topDirectoryWatcher = fs.watch(config.BISQ_BLOCKS.DATA_PATH, () => {
+    this.topDirectoryWatcher = fs.watch(config.BISQ.DATA_PATH + '/json', () => {
       if (fsWait) {
         clearTimeout(fsWait);
       }
@@ -126,7 +137,7 @@ class Bisq {
       return;
     }
     let fsWait: NodeJS.Timeout | null = null;
-    this.subdirectoryWatcher = fs.watch(config.BISQ_BLOCKS.DATA_PATH + '/all', () => {
+    this.subdirectoryWatcher = fs.watch(config.BISQ.DATA_PATH + '/json/all', () => {
       if (fsWait) {
         clearTimeout(fsWait);
       }
@@ -136,12 +147,59 @@ class Bisq {
       }, 2000);
     });
   }
+  private async updatePrice() {
+    type axiosOptions = {
+      headers: {
+        'User-Agent': string
+      };
+      timeout: number;
+      httpAgent?: http.Agent;
+      httpsAgent?: https.Agent;
+    }
+    const setDelay = (secs: number = 1): Promise<void> => new Promise(resolve => setTimeout(() => resolve(), secs * 1000));
+    const BISQ_URL = (config.SOCKS5PROXY.ENABLED === true) && (config.SOCKS5PROXY.USE_ONION === true) ? config.EXTERNAL_DATA_SERVER.BISQ_ONION : config.EXTERNAL_DATA_SERVER.BISQ_URL;
+    const isHTTP = (new URL(BISQ_URL).protocol.split(':')[0] === 'http') ? true : false;
+    const axiosOptions: axiosOptions = {
+      headers: {
+        'User-Agent': (config.MEMPOOL.USER_AGENT === 'mempool') ? `mempool/v${backendInfo.getBackendInfo().version}` : `${config.MEMPOOL.USER_AGENT}`
+      },
+      timeout: config.SOCKS5PROXY.ENABLED ? 30000 : 10000
+    };
+    let retry = 0;
 
-  private updatePrice() {
-    axios.get<BisqTrade[]>('https://bisq.markets/api/trades/?market=bsq_btc')
-      .then((response) => {
+    while(retry < config.MEMPOOL.EXTERNAL_MAX_RETRY) {
+      try {
+        if (config.SOCKS5PROXY.ENABLED) {
+          const socksOptions: any = {
+            agentOptions: {
+              keepAlive: true,
+            },
+            hostname: config.SOCKS5PROXY.HOST,
+            port: config.SOCKS5PROXY.PORT
+          };
+
+          if (config.SOCKS5PROXY.USERNAME && config.SOCKS5PROXY.PASSWORD) {
+            socksOptions.username = config.SOCKS5PROXY.USERNAME;
+            socksOptions.password = config.SOCKS5PROXY.PASSWORD;
+          } else {
+            // Retry with different tor circuits https://stackoverflow.com/a/64960234
+            socksOptions.username = `circuit${retry}`;
+          }
+
+          // Handle proxy agent for onion addresses
+          if (isHTTP) {
+            axiosOptions.httpAgent = new SocksProxyAgent(socksOptions);
+          } else {
+            axiosOptions.httpsAgent = new SocksProxyAgent(socksOptions);
+          }
+        }
+        
+        const data: AxiosResponse = await axios.get(`${BISQ_URL}/trades/?market=bsq_btc`, axiosOptions);
+        if (data.statusText === 'error' || !data.data) {
+          throw new Error(`Could not fetch data from Bisq market, Error: ${data.status}`);
+        }
         const prices: number[] = [];
-        response.data.forEach((trade) => {
+        data.data.forEach((trade) => {
           prices.push(parseFloat(trade.price) * 100000000);
         });
         prices.sort((a, b) => a - b);
@@ -149,19 +207,24 @@ class Bisq {
         if (this.priceUpdateCallbackFunction) {
           this.priceUpdateCallbackFunction(this.price);
         }
-    }).catch((err) => {
-      logger.err('Error updating Bisq market price: ' + err);
-    });
+        logger.debug('Successfully updated Bisq market price');
+        break;
+      } catch (e) {
+        logger.err('Error updating Bisq market price: '  + (e instanceof Error ? e.message : e));
+        await setDelay(config.MEMPOOL.EXTERNAL_RETRY_INTERVAL);
+        retry++;
+      }
+    }
   }
 
   private async loadBisqDumpFile(): Promise<void> {
+    this.allBlocks = [];
     try {
-      const data = await this.loadData();
-      await this.loadBisqBlocksDump(data);
+      await this.loadData();
       this.buildIndex();
       this.calculateStats();
     } catch (e) {
-      logger.err('loadBisqDumpFile() error.' + e.message || e);
+      logger.info('Cannot load bisq dump file because: ' + (e instanceof Error ? e.message : e));
     }
   }
 
@@ -171,7 +234,7 @@ class Bisq {
     this.transactionIndex = {};
     this.addressIndex = {};
 
-    this.blocks.forEach((block) => {
+    this.allBlocks.forEach((block) => {
       /* Build block index */
       if (!this.blockIndex[block.hash]) {
         this.blockIndex[block.hash] = block;
@@ -233,42 +296,68 @@ class Bisq {
 
     this.stats = {
       addresses: Object.keys(this.addressIndex).length,
-      minted: minted,
-      burnt: burned,
+      minted: minted / 100,
+      burnt: burned / 100,
       spent_txos: spent,
       unspent_txos: unspent,
     };
   }
 
-  private async loadBisqBlocksDump(cacheData: string): Promise<void> {
-    const start = new Date().getTime();
-    if (cacheData && cacheData.length !== 0) {
-      logger.debug('Processing Bisq data dump...');
-      const data: BisqBlocks = await this.jsonParsePool.exec(cacheData);
-      if (data.blocks && data.blocks.length !== this.blocks.length) {
-        this.blocks = data.blocks.filter((block) => block.txs.length > 0);
-        this.blocks.reverse();
-        this.latestBlockHeight = data.chainHeight;
-        const time = new Date().getTime() - start;
-        logger.debug('Bisq dump processed in ' + time + ' ms (worker thread)');
-      } else {
-        throw new Error(`Bisq dump didn't contain any blocks`);
-      }
+  private async loadData(): Promise<any> {
+    if (!fs.existsSync(Bisq.BLOCKS_JSON_FILE_PATH)) {
+      throw new Error(Bisq.BLOCKS_JSON_FILE_PATH + ` doesn't exist`);
     }
-  }
 
-  private loadData(): Promise<string> {
-    return new Promise((resolve, reject) => {
-      if (!fs.existsSync(Bisq.BLOCKS_JSON_FILE_PATH)) {
-        return reject(Bisq.BLOCKS_JSON_FILE_PATH + ` doesn't exist`);
-      }
-      fs.readFile(Bisq.BLOCKS_JSON_FILE_PATH, 'utf8', (err, data) => {
-        if (err) {
-          reject(err);
-        }
-        resolve(data);
-      });
+    const readline = require('readline');
+    const events = require('events');
+
+    const rl = readline.createInterface({
+      input: fs.createReadStream(Bisq.BLOCKS_JSON_FILE_PATH),
+      crlfDelay: Infinity
     });
+
+    let blockBuffer = '';
+    let readingBlock = false;
+    let lineCount = 1;
+    const start = new Date().getTime();
+
+    logger.debug('Processing Bisq data dump...');
+
+    rl.on('line', (line) => {
+      if (lineCount === 2) {
+        line = line.replace('  "chainHeight": ', '');
+        this.latestBlockHeight = parseInt(line, 10);
+      }
+
+      if (line === '    {') {
+        readingBlock = true;
+      } else if (line === '    },') {
+        blockBuffer += '}';
+        try {
+          const block: BisqBlock =  JSON.parse(blockBuffer);
+          this.allBlocks.push(block);
+          readingBlock = false;
+          blockBuffer = '';
+        } catch (e) {
+          logger.debug(blockBuffer);
+          throw Error(`Unable to parse Bisq data dump at line ${lineCount}` + (e instanceof Error ? e.message : e));
+        }
+      }
+
+      if (readingBlock === true) {
+        blockBuffer += line;
+      }
+
+      ++lineCount;
+    });
+
+    await events.once(rl, 'close');
+
+    this.allBlocks.reverse();
+    this.blocks = this.allBlocks.filter((block) => block.txs.length > 0);
+
+    const time = new Date().getTime() - start;
+    logger.debug('Bisq dump processed in ' + time + ' ms');
   }
 }
 

backend/src/api/bisq/interfaces.ts

@@ -71,7 +71,7 @@ interface BisqScriptPubKey {
   addresses: string[];
   asm: string;
   hex: string;
-  reqSigs: number;
+  reqSigs?: number;
   type: string;
 }
 

backend/src/api/bisq/markets-api.ts

@@ -1,7 +1,7 @@
 import { Currencies, OffersData, TradesData, Depth, Currency, Interval, HighLowOpenClose,
   Markets, Offers, Offer, BisqTrade, MarketVolume, Tickers, Ticker, SummarizedIntervals, SummarizedInterval } from './interfaces';
 
-import * as datetime from 'locutus/php/datetime';
+const strtotime = require('./strtotime');
 
 class BisqMarketsApi {
   private cryptoCurrencyData: Currency[] = [];
@@ -312,7 +312,7 @@ class BisqMarketsApi {
 
   getTickerFromMarket(market: string): Ticker | null {
     let ticker: Ticker;
-    const timestamp_from = datetime.strtotime('-24 hour');
+    const timestamp_from = strtotime('-24 hour');
     const timestamp_to = new Date().getTime() / 1000;
     const trades = this.getTradesByCriteria(market, timestamp_to, timestamp_from,
       undefined, undefined, undefined, 'asc', Number.MAX_SAFE_INTEGER);
@@ -457,6 +457,30 @@ class BisqMarketsApi {
     }
   }
 
+  getVolumesByTime(time: number): MarketVolume[] {
+    const timestamp_from = new Date().getTime() / 1000 - time;
+    const timestamp_to = new Date().getTime() / 1000;
+
+    const trades = this.getTradesByCriteria(undefined, timestamp_to, timestamp_from,
+      undefined, undefined, undefined, 'asc', Number.MAX_SAFE_INTEGER);
+
+    const markets: any = {};
+
+    for (const trade of trades) {
+      if (!markets[trade._market]) {
+        markets[trade._market] = {
+          'volume': 0,
+          'num_trades': 0,
+        };
+      }
+
+      markets[trade._market]['volume'] += this.fiatCurrenciesIndexed[trade.currency] ? trade._tradeAmount : trade._tradeVolume;
+      markets[trade._market]['num_trades']++;
+    }
+
+    return markets;
+  }
+
   private getTradesSummarized(trades: TradesData[], timestamp_from: number, interval?: string): SummarizedIntervals {
     const intervals: any = {};
     const intervals_prices: any = {};
@@ -614,13 +638,13 @@ class BisqMarketsApi {
         case 'half_day':
             return (ts - (ts % (3600 * 12)));
         case 'day':
-            return datetime.strtotime('midnight today', ts);
+            return strtotime('midnight today', ts);
         case 'week':
-            return datetime.strtotime('midnight sunday last week', ts);
+            return strtotime('midnight sunday last week', ts);
         case 'month':
-            return datetime.strtotime('midnight first day of this month', ts);
+            return strtotime('midnight first day of this month', ts);
         case 'year':
-            return datetime.strtotime('midnight first day of january', ts);
+            return strtotime('midnight first day of january', ts);
         default:
             throw new Error('Unsupported interval: ' + interval);
     }

backend/src/api/bisq/markets.ts

@@ -6,7 +6,7 @@ import logger from '../../logger';
 
 class Bisq {
   private static FOLDER_WATCH_CHANGE_DETECTION_DEBOUNCE = 4000;
-  private static MARKET_JSON_PATH = config.BISQ_MARKETS.DATA_PATH;
+  private static MARKET_JSON_PATH = config.BISQ.DATA_PATH;
   private static MARKET_JSON_FILE_PATHS = {
     activeCryptoCurrency: '/active_crypto_currency_list.json',
     activeFiatCurrency: '/active_fiat_currency_list.json',
@@ -26,7 +26,13 @@ class Bisq {
   constructor() {}
 
   startBisqService(): void {
-    this.checkForBisqDataFolder();
+    try {
+      this.checkForBisqDataFolder();
+    } catch (e) {
+      logger.info('Retrying to start bisq service (markets) in 3 minutes');
+      setTimeout(this.startBisqService.bind(this), 180000);
+      return;
+    }
     this.loadBisqDumpFile();
     this.startBisqDirectoryWatcher();
   }
@@ -34,7 +40,7 @@ class Bisq {
   private checkForBisqDataFolder() {
     if (!fs.existsSync(Bisq.MARKET_JSON_PATH + Bisq.MARKET_JSON_FILE_PATHS.cryptoCurrency)) {
       logger.err(Bisq.MARKET_JSON_PATH + Bisq.MARKET_JSON_FILE_PATHS.cryptoCurrency + ` doesn't exist. Make sure Bisq is running and the config is correct before starting the server.`);
-      return process.exit(1);
+      throw new Error(`Cannot load BISQ ${Bisq.MARKET_JSON_FILE_PATHS.cryptoCurrency} file`);
     }
   }
 
@@ -102,7 +108,7 @@ class Bisq {
         logger.debug('Bisq market data updated in ' + time + ' ms');
       }
     } catch (e) {
-      logger.err('loadBisqMarketDataDumpFile() error.' + e.message || e);
+      logger.err('loadBisqMarketDataDumpFile() error.' + (e instanceof Error ? e.message : e));
     }
   }
 

backend/src/api/bitcoin/bitcoin-api-abstract-factory.ts

@@ -2,13 +2,26 @@ import { IEsploraApi } from './esplora-api.interface';
 
 export interface AbstractBitcoinApi {
   $getRawMempool(): Promise<IEsploraApi.Transaction['txid'][]>;
-  $getRawTransaction(txId: string, skipConversion?: boolean, addPrevout?: boolean): Promise<IEsploraApi.Transaction>;
-  $getRawTransactionBitcoind(txId: string, skipConversion?: boolean, addPrevout?: boolean): Promise<IEsploraApi.Transaction>;
+  $getRawTransaction(txId: string, skipConversion?: boolean, addPrevout?: boolean, lazyPrevouts?: boolean): Promise<IEsploraApi.Transaction>;
   $getBlockHeightTip(): Promise<number>;
+  $getBlockHashTip(): Promise<string>;
   $getTxIdsForBlock(hash: string): Promise<string[]>;
   $getBlockHash(height: number): Promise<string>;
+  $getBlockHeader(hash: string): Promise<string>;
   $getBlock(hash: string): Promise<IEsploraApi.Block>;
+  $getRawBlock(hash: string): Promise<string>;
   $getAddress(address: string): Promise<IEsploraApi.Address>;
   $getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]>;
   $getAddressPrefix(prefix: string): string[];
+  $sendRawTransaction(rawTransaction: string): Promise<string>;
+  $getOutspend(txId: string, vout: number): Promise<IEsploraApi.Outspend>;
+  $getOutspends(txId: string): Promise<IEsploraApi.Outspend[]>;
+  $getBatchedOutspends(txId: string[]): Promise<IEsploraApi.Outspend[][]>;
+}
+export interface BitcoinRpcCredentials {
+  host: string;
+  port: number;
+  user: string;
+  pass: string;
+  timeout: number;
 }

backend/src/api/bitcoin/bitcoin-api-factory.ts

@@ -3,16 +3,17 @@ import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
 import EsploraApi from './esplora-api';
 import BitcoinApi from './bitcoin-api';
 import ElectrumApi from './electrum-api';
+import bitcoinClient from './bitcoin-client';
 
 function bitcoinApiFactory(): AbstractBitcoinApi {
   switch (config.MEMPOOL.BACKEND) {
     case 'esplora':
       return new EsploraApi();
     case 'electrum':
-      return new ElectrumApi();
+      return new ElectrumApi(bitcoinClient);
     case 'none':
     default:
-      return new BitcoinApi();
+      return new BitcoinApi(bitcoinClient);
   }
 }
 

backend/src/api/bitcoin/bitcoin-api.interface.ts

@@ -4,6 +4,7 @@ export namespace IBitcoinApi {
     size: number;                    //  (numeric) Current tx count
     bytes: number;                   //  (numeric) Sum of all virtual transaction sizes as defined in BIP 141.
     usage: number;                   //  (numeric) Total memory usage for the mempool
+    total_fee: number;               //  (numeric) Total fees of transactions in the mempool
     maxmempool: number;              //  (numeric) Maximum memory usage for the mempool
     mempoolminfee: number;           //  (numeric) Minimum fee rate in BTC/kB for tx to be accepted.
     minrelaytxfee: number;           //  (numeric) Current minimum relay fee for transactions
@@ -72,7 +73,15 @@ export namespace IBitcoinApi {
     time: number;                    //  (numeric) Same as blocktime
   }
 
-  interface Vin {
+  export interface VerboseBlock extends Block {
+    tx: VerboseTransaction[];        // The transactions in the format of the getrawtransaction RPC. Different from verbosity = 1 "tx" result
+  }
+
+  export interface VerboseTransaction extends Transaction {
+    fee?: number;                   //  (numeric) The transaction fee in BTC, omitted if block undo data is not available
+  }
+
+  export interface Vin {
     txid?: string;                   //  (string) The transaction id
     vout?: number;                   //  (string)
     scriptSig?: {                    //  (json object) The script
@@ -82,28 +91,36 @@ export namespace IBitcoinApi {
     sequence: number;                //  (numeric) The script sequence number
     txinwitness?: string[];          //  (string) hex-encoded witness data
     coinbase?: string;
+    is_pegin?: boolean;              //  (boolean) Elements peg-in
   }
 
-  interface Vout {
+  export interface Vout {
     value: number;                   //  (numeric) The value in BTC
     n: number;                       //  (numeric) index
+    asset?: string;                  //  (string) Elements asset id
     scriptPubKey: {                  //  (json object)
       asm: string;                   //  (string) the asm
       hex: string;                   //  (string) the hex
-      reqSigs: number;               //  (numeric) The required sigs
+      reqSigs?: number;              //  (numeric) The required sigs
       type: string;                  //  (string) The type, eg 'pubkeyhash'
-      addresses: string[]            //  (string) bitcoin address
+      address?: string;              //  (string) bitcoin address
+      addresses?: string[];           //  (string) bitcoin addresses
+      pegout_chain?: string;         //  (string) Elements peg-out chain
+      pegout_addresses?: string[];   //  (string) Elements peg-out addresses
     };
   }
 
   export interface AddressInformation {
     isvalid: boolean;                //  (boolean) If the address is valid or not. If not, this is the only property returned.
+    isvalid_parent?: boolean;        //  (boolean) Elements only
     address: string;                 //  (string) The bitcoin address validated
     scriptPubKey: string;            //  (string) The hex-encoded scriptPubKey generated by the address
     isscript: boolean;               //  (boolean) If the key is a script
     iswitness: boolean;              //  (boolean) If the address is a witness
-    witness_version?: boolean;       //  (numeric, optional) The version number of the witness program
+    witness_version?: number;        //  (numeric, optional) The version number of the witness program
     witness_program: string;         //  (string, optional) The hex value of the witness program
+    confidential_key?: string;       //  (string) Elements only
+    unconfidential?: string;         //  (string) Elements only
   }
 
   export interface ChainTips {
@@ -113,4 +130,46 @@ export namespace IBitcoinApi {
     status: 'invalid' | 'headers-only' | 'valid-headers' | 'valid-fork' | 'active';
   }
 
+  export interface BlockchainInfo {
+    chain: number;                   // (string) current network name as defined in BIP70 (main, test, regtest)
+    blocks: number;                  // (numeric) the current number of blocks processed in the server
+    headers: number;                 // (numeric) the current number of headers we have validated
+    bestblockhash: string,           // (string) the hash of the currently best block
+    difficulty: number;              // (numeric) the current difficulty
+    mediantime: number;              // (numeric) median time for the current best block
+    verificationprogress: number;    // (numeric) estimate of verification progress [0..1]
+    initialblockdownload: boolean;   // (bool) (debug information) estimate of whether this node is in Initial Block Download mode.
+    chainwork: string                // (string) total amount of work in active chain, in hexadecimal
+    size_on_disk: number;            // (numeric) the estimated size of the block and undo files on disk
+    pruned: number;                  // (boolean) if the blocks are subject to pruning
+    pruneheight: number;             // (numeric) lowest-height complete block stored (only present if pruning is enabled)
+    automatic_pruning: number;       // (boolean) whether automatic pruning is enabled (only present if pruning is enabled)
+    prune_target_size: number;       // (numeric) the target size used by pruning (only present if automatic pruning is enabled)
+    softforks: SoftFork[];           // (array) status of softforks in progress
+    bip9_softforks: { [name: string]: Bip9SoftForks[] } // (object) status of BIP9 softforks in progress
+    warnings: string;                // (string) any network and blockchain warnings.
+  }
+
+  interface SoftFork {
+    id: string;                      // (string) name of softfork
+    version: number;                 // (numeric) block version
+    reject: {                        // (object) progress toward rejecting pre-softfork blocks
+      status: boolean;               // (boolean) true if threshold reached
+    },
+  }
+  interface Bip9SoftForks {
+    status: number;                  // (string) one of defined, started, locked_in, active, failed
+    bit: number;                     // (numeric) the bit (0-28) in the block version field used to signal this softfork (only for started status)
+    startTime: number;               // (numeric) the minimum median time past of a block at which the bit gains its meaning
+    timeout: number;                 // (numeric) the median time past of a block at which the deployment is considered failed if not yet locked in
+    since: number;                   // (numeric) height of the first block to which the status applies
+    statistics: {                    // (object) numeric statistics about BIP9 signalling for a softfork (only for started status)
+      period: number;                // (numeric) the length in blocks of the BIP9 signalling period 
+      threshold: number;             // (numeric) the number of blocks with the version bit set required to activate the feature 
+      elapsed: number;               // (numeric) the number of blocks elapsed since the beginning of the current period 
+      count: number;                 // (numeric) the number of blocks with the version bit set in the current period 
+      possible: boolean;             // (boolean) returns false if there are not enough blocks left in this period to pass activation threshold 
+    }
+  }
+
 }

backend/src/api/bitcoin/bitcoin-api.ts

@@ -1,166 +1,20 @@
-import config from '../../config';
-import * as bitcoin from '@mempool/bitcoin';
 import * as bitcoinjs from 'bitcoinjs-lib';
 import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
 import { IBitcoinApi } from './bitcoin-api.interface';
 import { IEsploraApi } from './esplora-api.interface';
 import blocks from '../blocks';
-import bitcoinBaseApi from './bitcoin-base.api';
 import mempool from '../mempool';
 import { TransactionExtended } from '../../mempool.interfaces';
 
 class BitcoinApi implements AbstractBitcoinApi {
   private rawMempoolCache: IBitcoinApi.RawMempool | null = null;
-  private bitcoindClient: any;
+  protected bitcoindClient: any;
 
-  constructor() {
-    this.bitcoindClient = new bitcoin.Client({
-      host: config.CORE_RPC.HOST,
-      port: config.CORE_RPC.PORT,
-      user: config.CORE_RPC.USERNAME,
-      pass: config.CORE_RPC.PASSWORD,
-      timeout: 60000,
-    });
+  constructor(bitcoinClient: any) {
+    this.bitcoindClient = bitcoinClient;
   }
 
-  $getRawTransactionBitcoind(txId: string, skipConversion = false, addPrevout = false): Promise<IEsploraApi.Transaction> {
-    return this.bitcoindClient.getRawTransaction(txId, true)
-      .then((transaction: IBitcoinApi.Transaction) => {
-        if (skipConversion) {
-          return transaction;
-        }
-        return this.$convertTransaction(transaction, addPrevout);
-      });
-  }
-
-  $getRawTransaction(txId: string, skipConversion = false, addPrevout = false): Promise<IEsploraApi.Transaction> {
-    // If the transaction is in the mempool we already converted and fetched the fee. Only prevouts are missing
-    const txInMempool = mempool.getMempool()[txId];
-    if (txInMempool && addPrevout) {
-      return this.$addPrevouts(txInMempool);
-    }
-
-    // Special case to fetch the Coinbase transaction
-    if (txId === '4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b') {
-      return this.$returnCoinbaseTransaction();
-    }
-
-    return this.bitcoindClient.getRawTransaction(txId, true)
-      .then((transaction: IBitcoinApi.Transaction) => {
-        if (skipConversion) {
-          return transaction;
-        }
-        return this.$convertTransaction(transaction, addPrevout);
-      });
-  }
-
-  $getBlockHeightTip(): Promise<number> {
-    return this.bitcoindClient.getChainTips()
-      .then((result: IBitcoinApi.ChainTips[]) => result[0].height);
-  }
-
-  $getTxIdsForBlock(hash: string): Promise<string[]> {
-    return this.bitcoindClient.getBlock(hash, 1)
-      .then((rpcBlock: IBitcoinApi.Block) => rpcBlock.tx);
-  }
-
-  $getBlockHash(height: number): Promise<string> {
-    return this.bitcoindClient.getBlockHash(height);
-  }
-
-  async $getBlock(hash: string): Promise<IEsploraApi.Block> {
-    const foundBlock = blocks.getBlocks().find((block) => block.id === hash);
-    if (foundBlock) {
-      return foundBlock;
-    }
-
-    return this.bitcoindClient.getBlock(hash)
-      .then((block: IBitcoinApi.Block) => this.convertBlock(block));
-  }
-
-  $getAddress(address: string): Promise<IEsploraApi.Address> {
-    throw new Error('Method getAddress not supported by the Bitcoin RPC API.');
-  }
-
-  $getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]> {
-    throw new Error('Method getAddressTransactions not supported by the Bitcoin RPC API.');
-  }
-
-  $getRawMempool(): Promise<IEsploraApi.Transaction['txid'][]> {
-    return this.bitcoindClient.getRawMemPool();
-  }
-
-  $getAddressPrefix(prefix: string): string[] {
-    const found: string[] = [];
-    const mp = mempool.getMempool();
-    for (const tx in mp) {
-      for (const vout of mp[tx].vout) {
-        if (vout.scriptpubkey_address.indexOf(prefix) === 0) {
-          found.push(vout.scriptpubkey_address);
-          if (found.length >= 10) {
-            return found;
-          }
-        }
-      }
-    }
-    return found;
-  }
-
-  protected async $convertTransaction(transaction: IBitcoinApi.Transaction, addPrevout: boolean): Promise<IEsploraApi.Transaction> {
-    let esploraTransaction: IEsploraApi.Transaction = {
-      txid: transaction.txid,
-      version: transaction.version,
-      locktime: transaction.locktime,
-      size: transaction.size,
-      weight: transaction.weight,
-      fee: 0,
-      vin: [],
-      vout: [],
-      status: { confirmed: false },
-    };
-
-    esploraTransaction.vout = transaction.vout.map((vout) => {
-      return {
-        value: vout.value * 100000000,
-        scriptpubkey: vout.scriptPubKey.hex,
-        scriptpubkey_address: vout.scriptPubKey && vout.scriptPubKey.addresses ? vout.scriptPubKey.addresses[0] : '',
-        scriptpubkey_asm: vout.scriptPubKey.asm ? this.convertScriptSigAsm(vout.scriptPubKey.asm) : '',
-        scriptpubkey_type: this.translateScriptPubKeyType(vout.scriptPubKey.type),
-      };
-    });
-
-    esploraTransaction.vin = transaction.vin.map((vin) => {
-      return {
-        is_coinbase: !!vin.coinbase,
-        prevout: null,
-        scriptsig: vin.scriptSig && vin.scriptSig.hex || vin.coinbase || '',
-        scriptsig_asm: vin.scriptSig && this.convertScriptSigAsm(vin.scriptSig.asm) || '',
-        sequence: vin.sequence,
-        txid: vin.txid || '',
-        vout: vin.vout || 0,
-        witness: vin.txinwitness,
-      };
-    });
-
-    if (transaction.confirmations) {
-      esploraTransaction.status = {
-        confirmed: true,
-        block_height: blocks.getCurrentBlockHeight() - transaction.confirmations + 1,
-        block_hash: transaction.blockhash,
-        block_time: transaction.blocktime,
-      };
-    }
-
-    if (transaction.confirmations) {
-      esploraTransaction = await this.$calculateFeeFromInputs(esploraTransaction, addPrevout);
-    } else {
-      esploraTransaction = await this.$appendMempoolFeeData(esploraTransaction);
-    }
-
-    return esploraTransaction;
-  }
-
-  private convertBlock(block: IBitcoinApi.Block): IEsploraApi.Block {
+  static convertBlock(block: IBitcoinApi.Block): IEsploraApi.Block {
     return {
       id: block.hash,
       height: block.height,
@@ -177,6 +31,205 @@ class BitcoinApi implements AbstractBitcoinApi {
     };
   }
 
+
+  $getRawTransaction(txId: string, skipConversion = false, addPrevout = false, lazyPrevouts = false): Promise<IEsploraApi.Transaction> {
+    // If the transaction is in the mempool we already converted and fetched the fee. Only prevouts are missing
+    const txInMempool = mempool.getMempool()[txId];
+    if (txInMempool && addPrevout) {
+      return this.$addPrevouts(txInMempool);
+    }
+
+    return this.bitcoindClient.getRawTransaction(txId, true)
+      .then((transaction: IBitcoinApi.Transaction) => {
+        if (skipConversion) {
+          transaction.vout.forEach((vout) => {
+            vout.value = Math.round(vout.value * 100000000);
+          });
+          return transaction;
+        }
+        return this.$convertTransaction(transaction, addPrevout, lazyPrevouts);
+      })
+      .catch((e: Error) => {
+        if (e.message.startsWith('The genesis block coinbase')) {
+          return this.$returnCoinbaseTransaction();
+        }
+        throw e;
+      });
+  }
+
+  $getBlockHeightTip(): Promise<number> {
+    return this.bitcoindClient.getChainTips()
+      .then((result: IBitcoinApi.ChainTips[]) => {
+        return result.find(tip => tip.status === 'active')!.height;
+      });
+  }
+
+  $getBlockHashTip(): Promise<string> {
+    return this.bitcoindClient.getChainTips()
+      .then((result: IBitcoinApi.ChainTips[]) => {
+        return result.find(tip => tip.status === 'active')!.hash;
+      });
+  }
+
+  $getTxIdsForBlock(hash: string): Promise<string[]> {
+    return this.bitcoindClient.getBlock(hash, 1)
+      .then((rpcBlock: IBitcoinApi.Block) => rpcBlock.tx);
+  }
+
+  $getRawBlock(hash: string): Promise<string> {
+    return this.bitcoindClient.getBlock(hash, 0)
+      .then((raw: string) => Buffer.from(raw, "hex"));
+  }
+
+  $getBlockHash(height: number): Promise<string> {
+    return this.bitcoindClient.getBlockHash(height);
+  }
+
+  $getBlockHeader(hash: string): Promise<string> {
+    return this.bitcoindClient.getBlockHeader(hash, false);
+  }
+
+  async $getBlock(hash: string): Promise<IEsploraApi.Block> {
+    const foundBlock = blocks.getBlocks().find((block) => block.id === hash);
+    if (foundBlock) {
+      return foundBlock;
+    }
+
+    return this.bitcoindClient.getBlock(hash)
+      .then((block: IBitcoinApi.Block) => BitcoinApi.convertBlock(block));
+  }
+
+  $getAddress(address: string): Promise<IEsploraApi.Address> {
+    throw new Error('Method getAddress not supported by the Bitcoin RPC API.');
+  }
+
+  $getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]> {
+    throw new Error('Method getAddressTransactions not supported by the Bitcoin RPC API.');
+  }
+
+  $getRawMempool(): Promise<IEsploraApi.Transaction['txid'][]> {
+    return this.bitcoindClient.getRawMemPool();
+  }
+
+  $getAddressPrefix(prefix: string): string[] {
+    const found: { [address: string]: string } = {};
+    const mp = mempool.getMempool();
+    for (const tx in mp) {
+      for (const vout of mp[tx].vout) {
+        if (vout.scriptpubkey_address.indexOf(prefix) === 0) {
+          found[vout.scriptpubkey_address] = '';
+          if (Object.keys(found).length >= 10) {
+            return Object.keys(found);
+          }
+        }
+      }
+    }
+    return Object.keys(found);
+  }
+
+  $sendRawTransaction(rawTransaction: string): Promise<string> {
+    return this.bitcoindClient.sendRawTransaction(rawTransaction);
+  }
+
+  async $getOutspend(txId: string, vout: number): Promise<IEsploraApi.Outspend> {
+    const txOut = await this.bitcoindClient.getTxOut(txId, vout, false);
+    return {
+      spent: txOut === null,
+      status: {
+        confirmed: true,
+      }
+    };
+  }
+
+  async $getOutspends(txId: string): Promise<IEsploraApi.Outspend[]> {
+    const outSpends: IEsploraApi.Outspend[] = [];
+    const tx = await this.$getRawTransaction(txId, true, false);
+    for (let i = 0; i < tx.vout.length; i++) {
+      if (tx.status && tx.status.block_height === 0) {
+        outSpends.push({
+          spent: false
+        });
+      } else {
+        const txOut = await this.bitcoindClient.getTxOut(txId, i);
+        outSpends.push({
+          spent: txOut === null,
+        });
+      }
+    }
+    return outSpends;
+  }
+
+  async $getBatchedOutspends(txId: string[]): Promise<IEsploraApi.Outspend[][]> {
+    const outspends: IEsploraApi.Outspend[][] = [];
+    for (const tx of txId) {
+      const outspend = await this.$getOutspends(tx);
+      outspends.push(outspend);
+    }
+    return outspends;
+  }
+
+  $getEstimatedHashrate(blockHeight: number): Promise<number> {
+    // 120 is the default block span in Core
+    return this.bitcoindClient.getNetworkHashPs(120, blockHeight);
+  }
+
+  protected async $convertTransaction(transaction: IBitcoinApi.Transaction, addPrevout: boolean, lazyPrevouts = false): Promise<IEsploraApi.Transaction> {
+    let esploraTransaction: IEsploraApi.Transaction = {
+      txid: transaction.txid,
+      version: transaction.version,
+      locktime: transaction.locktime,
+      size: transaction.size,
+      weight: transaction.weight,
+      fee: 0,
+      vin: [],
+      vout: [],
+      status: { confirmed: false },
+    };
+
+    esploraTransaction.vout = transaction.vout.map((vout) => {
+      return {
+        value: Math.round(vout.value * 100000000),
+        scriptpubkey: vout.scriptPubKey.hex,
+        scriptpubkey_address: vout.scriptPubKey && vout.scriptPubKey.address ? vout.scriptPubKey.address
+          : vout.scriptPubKey.addresses ? vout.scriptPubKey.addresses[0] : '',
+        scriptpubkey_asm: vout.scriptPubKey.asm ? this.convertScriptSigAsm(vout.scriptPubKey.hex) : '',
+        scriptpubkey_type: this.translateScriptPubKeyType(vout.scriptPubKey.type),
+      };
+    });
+
+    esploraTransaction.vin = transaction.vin.map((vin) => {
+      return {
+        is_coinbase: !!vin.coinbase,
+        prevout: null,
+        scriptsig: vin.scriptSig && vin.scriptSig.hex || vin.coinbase || '',
+        scriptsig_asm: vin.scriptSig && this.convertScriptSigAsm(vin.scriptSig.hex) || '',
+        sequence: vin.sequence,
+        txid: vin.txid || '',
+        vout: vin.vout || 0,
+        witness: vin.txinwitness || [],
+        inner_redeemscript_asm: '',
+        inner_witnessscript_asm: '',
+      };
+    });
+
+    if (transaction.confirmations) {
+      esploraTransaction.status = {
+        confirmed: true,
+        block_height: blocks.getCurrentBlockHeight() - transaction.confirmations + 1,
+        block_hash: transaction.blockhash,
+        block_time: transaction.blocktime,
+      };
+    }
+
+    if (addPrevout) {
+      esploraTransaction = await this.$calculateFeeFromInputs(esploraTransaction, false, lazyPrevouts);
+    } else if (!transaction.confirmations) {
+      esploraTransaction = await this.$appendMempoolFeeData(esploraTransaction);
+    }
+
+    return esploraTransaction;
+  }
+
   private translateScriptPubKeyType(outputType: string): string {
     const map = {
       'pubkey': 'p2pk',
@@ -186,13 +239,14 @@ class BitcoinApi implements AbstractBitcoinApi {
       'witness_v0_scripthash': 'v0_p2wsh',
       'witness_v1_taproot': 'v1_p2tr',
       'nonstandard': 'nonstandard',
+      'multisig': 'multisig',
       'nulldata': 'op_return'
     };
 
     if (map[outputType]) {
       return map[outputType];
     } else {
-      return '';
+      return 'unknown';
     }
   }
 
@@ -202,14 +256,14 @@ class BitcoinApi implements AbstractBitcoinApi {
     }
     let mempoolEntry: IBitcoinApi.MempoolEntry;
     if (!mempool.isInSync() && !this.rawMempoolCache) {
-      this.rawMempoolCache = await bitcoinBaseApi.$getRawMempoolVerbose();
+      this.rawMempoolCache = await this.$getRawMempoolVerbose();
     }
     if (this.rawMempoolCache && this.rawMempoolCache[transaction.txid]) {
       mempoolEntry = this.rawMempoolCache[transaction.txid];
     } else {
-      mempoolEntry = await bitcoinBaseApi.$getMempoolEntry(transaction.txid);
+      mempoolEntry = await this.$getMempoolEntry(transaction.txid);
     }
-    transaction.fee = mempoolEntry.fees.base * 100000000;
+    transaction.fee = Math.round(mempoolEntry.fees.base * 100000000);
     return transaction;
   }
 
@@ -218,7 +272,7 @@ class BitcoinApi implements AbstractBitcoinApi {
       if (vin.prevout) {
         continue;
       }
-      const innerTx = await this.$getRawTransaction(vin.txid, false);
+      const innerTx = await this.$getRawTransaction(vin.txid, false, false);
       vin.prevout = innerTx.vout[vin.vout];
       this.addInnerScriptsToVin(vin);
     }
@@ -226,54 +280,113 @@ class BitcoinApi implements AbstractBitcoinApi {
   }
 
   protected $returnCoinbaseTransaction(): Promise<IEsploraApi.Transaction> {
-    return this.bitcoindClient.getBlock('000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f', 2)
-      .then((block: IBitcoinApi.Block) => {
-        return this.$convertTransaction(Object.assign(block.tx[0], {
-          confirmations: blocks.getCurrentBlockHeight() + 1,
-          blocktime: 1231006505 }), false);
-      });
+    return this.bitcoindClient.getBlockHash(0).then((hash: string) =>
+      this.bitcoindClient.getBlock(hash, 2)
+        .then((block: IBitcoinApi.Block) => {
+          return this.$convertTransaction(Object.assign(block.tx[0], {
+            confirmations: blocks.getCurrentBlockHeight() + 1,
+            blocktime: block.time }), false);
+        })
+    );
   }
 
-  protected $validateAddress(address: string): Promise<IBitcoinApi.AddressInformation> {
-    return this.bitcoindClient.validateAddress(address);
+  private $getMempoolEntry(txid: string): Promise<IBitcoinApi.MempoolEntry> {
+    return this.bitcoindClient.getMempoolEntry(txid);
   }
 
-  private async $calculateFeeFromInputs(transaction: IEsploraApi.Transaction, addPrevout: boolean): Promise<IEsploraApi.Transaction> {
+  private $getRawMempoolVerbose(): Promise<IBitcoinApi.RawMempool> {
+    return this.bitcoindClient.getRawMemPool(true);
+  }
+
+
+  private async $calculateFeeFromInputs(transaction: IEsploraApi.Transaction, addPrevout: boolean, lazyPrevouts: boolean): Promise<IEsploraApi.Transaction> {
     if (transaction.vin[0].is_coinbase) {
       transaction.fee = 0;
       return transaction;
     }
     let totalIn = 0;
-    for (const vin of transaction.vin) {
-      const innerTx = await this.$getRawTransaction(vin.txid, !addPrevout);
-      if (addPrevout) {
-        vin.prevout = innerTx.vout[vin.vout];
-        this.addInnerScriptsToVin(vin);
+
+    for (let i = 0; i < transaction.vin.length; i++) {
+      if (lazyPrevouts && i > 12) {
+        transaction.vin[i].lazy = true;
+        continue;
       }
-      totalIn += innerTx.vout[vin.vout].value;
+      const innerTx = await this.$getRawTransaction(transaction.vin[i].txid, false, false);
+      transaction.vin[i].prevout = innerTx.vout[transaction.vin[i].vout];
+      this.addInnerScriptsToVin(transaction.vin[i]);
+      totalIn += innerTx.vout[transaction.vin[i].vout].value;
+    }
+    if (lazyPrevouts && transaction.vin.length > 12) {
+      transaction.fee = -1;
+    } else {
+      const totalOut = transaction.vout.reduce((p, output) => p + output.value, 0);
+      transaction.fee = parseFloat((totalIn - totalOut).toFixed(8));
     }
-    const totalOut = transaction.vout.reduce((p, output) => p + output.value, 0);
-    transaction.fee = parseFloat((totalIn - totalOut).toFixed(8));
     return transaction;
   }
 
-  private convertScriptSigAsm(str: string): string {
-    const a = str.split(' ');
+  private convertScriptSigAsm(hex: string): string {
+    const buf = Buffer.from(hex, 'hex');
+
     const b: string[] = [];
-    a.forEach((chunk) => {
-      if (chunk.substr(0, 3) === 'OP_') {
-        chunk = chunk.replace(/^OP_(\d+)/, 'OP_PUSHNUM_$1');
-        chunk = chunk.replace('OP_CHECKSEQUENCEVERIFY', 'OP_CSV');
-        b.push(chunk);
-      } else {
-        chunk = chunk.replace('[ALL]', '01');
-        if (chunk === '0') {
-          b.push('OP_0');
+
+    let i = 0;
+    while (i < buf.length) {
+      const op = buf[i];
+      if (op >= 0x01 && op <= 0x4e) {
+        i++;
+        let push: number;
+        if (op === 0x4c) {
+          push = buf.readUInt8(i);
+          b.push('OP_PUSHDATA1');
+          i += 1;
+        } else if (op === 0x4d) {
+          push = buf.readUInt16LE(i);
+          b.push('OP_PUSHDATA2');
+          i += 2;
+        } else if (op === 0x4e) {
+          push = buf.readUInt32LE(i);
+          b.push('OP_PUSHDATA4');
+          i += 4;
         } else {
-          b.push('OP_PUSHBYTES_' + Math.round(chunk.length / 2) + ' ' + chunk);
+          push = op;
+          b.push('OP_PUSHBYTES_' + push);
         }
+
+        const data = buf.slice(i, i + push);
+        if (data.length !== push) {
+          break;
+        }
+
+        b.push(data.toString('hex'));
+        i += data.length;
+      } else {
+        if (op === 0x00) {
+          b.push('OP_0');
+        } else if (op === 0x4f) {
+          b.push('OP_PUSHNUM_NEG1');
+        } else if (op === 0xb1) {
+          b.push('OP_CLTV');
+        } else if (op === 0xb2) {
+          b.push('OP_CSV');
+        } else if (op === 0xba) {
+          b.push('OP_CHECKSIGADD');
+        } else {
+          const opcode = bitcoinjs.script.toASM([ op ]);
+          if (opcode && op < 0xfd) {
+            if (/^OP_(\d+)$/.test(opcode)) {
+              b.push(opcode.replace(/^OP_(\d+)$/, 'OP_PUSHNUM_$1'));
+            } else {
+              b.push(opcode);
+            }
+          } else {
+            b.push('OP_RETURN_' + op);
+          }
+        }
+        i += 1;
       }
-    });
+    }
+
     return b.join(' ');
   }
 
@@ -284,12 +397,21 @@ class BitcoinApi implements AbstractBitcoinApi {
 
     if (vin.prevout.scriptpubkey_type === 'p2sh') {
       const redeemScript = vin.scriptsig_asm.split(' ').reverse()[0];
-      vin.inner_redeemscript_asm = this.convertScriptSigAsm(bitcoinjs.script.toASM(Buffer.from(redeemScript, 'hex')));
+      vin.inner_redeemscript_asm = this.convertScriptSigAsm(redeemScript);
+      if (vin.witness && vin.witness.length > 2) {
+        const witnessScript = vin.witness[vin.witness.length - 1];
+        vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
+      }
     }
 
     if (vin.prevout.scriptpubkey_type === 'v0_p2wsh' && vin.witness) {
       const witnessScript = vin.witness[vin.witness.length - 1];
-      vin.inner_witnessscript_asm = this.convertScriptSigAsm(bitcoinjs.script.toASM(Buffer.from(witnessScript, 'hex')));
+      vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
+    }
+
+    if (vin.prevout.scriptpubkey_type === 'v1_p2tr' && vin.witness && vin.witness.length > 1) {
+      const witnessScript = vin.witness[vin.witness.length - 2];
+      vin.inner_witnessscript_asm = this.convertScriptSigAsm(witnessScript);
     }
   }
 

backend/src/api/bitcoin/bitcoin-base.api.ts

@@ -1,36 +0,0 @@
-import config from '../../config';
-import * as bitcoin from '@mempool/bitcoin';
-import { IBitcoinApi } from './bitcoin-api.interface';
-
-class BitcoinBaseApi {
-  bitcoindClient: any;
-
-  constructor() {
-    this.bitcoindClient = new bitcoin.Client({
-      host: config.CORE_RPC.HOST,
-      port: config.CORE_RPC.PORT,
-      user: config.CORE_RPC.USERNAME,
-      pass: config.CORE_RPC.PASSWORD,
-      timeout: 60000,
-    });
-  }
-
-  $getMempoolInfo(): Promise<IBitcoinApi.MempoolInfo> {
-    return this.bitcoindClient.getMempoolInfo();
-  }
-
-  $getRawTransaction(txId: string): Promise<IBitcoinApi.Transaction> {
-    return this.bitcoindClient.getRawTransaction(txId, true);
-  }
-
-  $getMempoolEntry(txid: string): Promise<IBitcoinApi.MempoolEntry> {
-    return this.bitcoindClient.getMempoolEntry(txid);
-  }
-
-  $getRawMempoolVerbose(): Promise<IBitcoinApi.RawMempool> {
-    return this.bitcoindClient.getRawMemPool(true);
-  }
-
-}
-
-export default new BitcoinBaseApi();

backend/src/api/bitcoin/bitcoin-client.ts

@@ -0,0 +1,13 @@
+import config from '../../config';
+const bitcoin = require('../../rpc-api/index');
+import { BitcoinRpcCredentials } from './bitcoin-api-abstract-factory';
+
+const nodeRpcCredentials: BitcoinRpcCredentials = {
+  host: config.CORE_RPC.HOST,
+  port: config.CORE_RPC.PORT,
+  user: config.CORE_RPC.USERNAME,
+  pass: config.CORE_RPC.PASSWORD,
+  timeout: 60000,
+};
+
+export default new bitcoin.Client(nodeRpcCredentials);

backend/src/api/bitcoin/bitcoin-second-client.ts

@@ -0,0 +1,13 @@
+import config from '../../config';
+const bitcoin = require('../../rpc-api/index');
+import { BitcoinRpcCredentials } from './bitcoin-api-abstract-factory';
+
+const nodeRpcCredentials: BitcoinRpcCredentials = {
+  host: config.SECOND_CORE_RPC.HOST,
+  port: config.SECOND_CORE_RPC.PORT,
+  user: config.SECOND_CORE_RPC.USERNAME,
+  pass: config.SECOND_CORE_RPC.PASSWORD,
+  timeout: 60000,
+};
+
+export default new bitcoin.Client(nodeRpcCredentials);

backend/src/api/bitcoin/bitcoin.routes.ts

@@ -0,0 +1,554 @@
+import { Application, Request, Response } from 'express';
+import axios from 'axios';
+import config from '../../config';
+import websocketHandler from '../websocket-handler';
+import mempool from '../mempool';
+import feeApi from '../fee-api';
+import mempoolBlocks from '../mempool-blocks';
+import bitcoinApi from './bitcoin-api-factory';
+import { Common } from '../common';
+import backendInfo from '../backend-info';
+import transactionUtils from '../transaction-utils';
+import { IEsploraApi } from './esplora-api.interface';
+import loadingIndicators from '../loading-indicators';
+import { TransactionExtended } from '../../mempool.interfaces';
+import logger from '../../logger';
+import blocks from '../blocks';
+import bitcoinClient from './bitcoin-client';
+import difficultyAdjustment from '../difficulty-adjustment';
+
+class BitcoinRoutes {
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'transaction-times', this.getTransactionTimes)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'outspends', this.$getBatchedOutspends)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'cpfp/:txId', this.getCpfpInfo)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'difficulty-adjustment', this.getDifficultyChange)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'fees/recommended', this.getRecommendedFees)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'fees/mempool-blocks', this.getMempoolBlocks)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'backend-info', this.getBackendInfo)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'init-data', this.getInitData)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'validate-address/:address', this.validateAddress)
+      .post(config.MEMPOOL.API_URL_PREFIX + 'tx/push', this.$postTransactionForm)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'donations', async (req, res) => {
+        try {
+          const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.MEMPOOL_API}/donations`, { responseType: 'stream', timeout: 10000 });
+          response.data.pipe(res);
+        } catch (e) {
+          res.status(500).end();
+        }
+      })
+      .get(config.MEMPOOL.API_URL_PREFIX + 'donations/images/:id', async (req, res) => {
+        try {
+          const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.MEMPOOL_API}/donations/images/${req.params.id}`, {
+            responseType: 'stream', timeout: 10000
+          });
+          response.data.pipe(res);
+        } catch (e) {
+          res.status(500).end();
+        }
+      })
+      .get(config.MEMPOOL.API_URL_PREFIX + 'contributors', async (req, res) => {
+        try {
+          const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.MEMPOOL_API}/contributors`, { responseType: 'stream', timeout: 10000 });
+          response.data.pipe(res);
+        } catch (e) {
+          res.status(500).end();
+        }
+      })
+      .get(config.MEMPOOL.API_URL_PREFIX + 'contributors/images/:id', async (req, res) => {
+        try {
+          const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.MEMPOOL_API}/contributors/images/${req.params.id}`, {
+            responseType: 'stream', timeout: 10000
+          });
+          response.data.pipe(res);
+        } catch (e) {
+          res.status(500).end();
+        }
+      })
+      .get(config.MEMPOOL.API_URL_PREFIX + 'translators', async (req, res) => {
+        try {
+          const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.MEMPOOL_API}/translators`, { responseType: 'stream', timeout: 10000 });
+          response.data.pipe(res);
+        } catch (e) {
+          res.status(500).end();
+        }
+      })
+      .get(config.MEMPOOL.API_URL_PREFIX + 'translators/images/:id', async (req, res) => {
+        try {
+          const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.MEMPOOL_API}/translators/images/${req.params.id}`, {
+            responseType: 'stream', timeout: 10000
+          });
+          response.data.pipe(res);
+        } catch (e) {
+          res.status(500).end();
+        }
+      })
+      .get(config.MEMPOOL.API_URL_PREFIX + 'blocks', this.getBlocks.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/:height', this.getBlocks.bind(this))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash', this.getBlock)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/summary', this.getStrippedBlockTransactions);
+      ;
+
+      if (config.MEMPOOL.BACKEND !== 'esplora') {
+        app
+          .get(config.MEMPOOL.API_URL_PREFIX + 'mempool', this.getMempool)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'mempool/txids', this.getMempoolTxIds)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'mempool/recent', this.getRecentMempoolTransactions)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId', this.getTransaction)
+          .post(config.MEMPOOL.API_URL_PREFIX + 'tx', this.$postTransaction)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/hex', this.getRawTransaction)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/status', this.getTransactionStatus)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/outspends', this.getTransactionOutspends)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/header', this.getBlockHeader)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/tip/height', this.getBlockTipHeight)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/tip/hash', this.getBlockTipHash)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/raw', this.getRawBlock)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/txids', this.getTxIdsForBlock)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/txs', this.getBlockTransactions)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/txs/:index', this.getBlockTransactions)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'block-height/:height', this.getBlockHeight)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'address/:address', this.getAddress)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'address/:address/txs', this.getAddressTransactions)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'address/:address/txs/chain/:txId', this.getAddressTransactions)
+          .get(config.MEMPOOL.API_URL_PREFIX + 'address-prefix/:prefix', this.getAddressPrefix)
+          ;
+      }
+  }
+
+
+  private getInitData(req: Request, res: Response) {
+    try {
+      const result = websocketHandler.getInitData();
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private getRecommendedFees(req: Request, res: Response) {
+    if (!mempool.isInSync()) {
+      res.statusCode = 503;
+      res.send('Service Unavailable');
+      return;
+    }
+    const result = feeApi.getRecommendedFee();
+    res.json(result);
+  }
+
+  private getMempoolBlocks(req: Request, res: Response) {
+    try {
+      const result = mempoolBlocks.getMempoolBlocks();
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private getTransactionTimes(req: Request, res: Response) {
+    if (!Array.isArray(req.query.txId)) {
+      res.status(500).send('Not an array');
+      return;
+    }
+    const txIds: string[] = [];
+    for (const _txId in req.query.txId) {
+      if (typeof req.query.txId[_txId] === 'string') {
+        txIds.push(req.query.txId[_txId].toString());
+      }
+    }
+
+    const times = mempool.getFirstSeenForTransactions(txIds);
+    res.json(times);
+  }
+
+  private async $getBatchedOutspends(req: Request, res: Response) {
+    if (!Array.isArray(req.query.txId)) {
+      res.status(500).send('Not an array');
+      return;
+    }
+    if (req.query.txId.length > 50) {
+      res.status(400).send('Too many txids requested');
+      return;
+    }
+    const txIds: string[] = [];
+    for (const _txId in req.query.txId) {
+      if (typeof req.query.txId[_txId] === 'string') {
+        txIds.push(req.query.txId[_txId].toString());
+      }
+    }
+
+    try {
+      const batchedOutspends = await bitcoinApi.$getBatchedOutspends(txIds);
+      res.json(batchedOutspends);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private getCpfpInfo(req: Request, res: Response) {
+    if (!/^[a-fA-F0-9]{64}$/.test(req.params.txId)) {
+      res.status(501).send(`Invalid transaction ID.`);
+      return;
+    }
+
+    const tx = mempool.getMempool()[req.params.txId];
+    if (!tx) {
+      res.status(404).send(`Transaction doesn't exist in the mempool.`);
+      return;
+    }
+
+    if (tx.cpfpChecked) {
+      res.json({
+        ancestors: tx.ancestors,
+        bestDescendant: tx.bestDescendant || null,
+      });
+      return;
+    }
+
+    const cpfpInfo = Common.setRelativesAndGetCpfpInfo(tx, mempool.getMempool());
+
+    res.json(cpfpInfo);
+  }
+
+  private getBackendInfo(req: Request, res: Response) {
+    res.json(backendInfo.getBackendInfo());
+  }
+
+  private async getTransaction(req: Request, res: Response) {
+    try {
+      const transaction = await transactionUtils.$getTransactionExtended(req.params.txId, true);
+      res.json(transaction);
+    } catch (e) {
+      let statusCode = 500;
+      if (e instanceof Error && e instanceof Error && e.message && e.message.indexOf('No such mempool or blockchain transaction') > -1) {
+        statusCode = 404;
+      }
+      res.status(statusCode).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getRawTransaction(req: Request, res: Response) {
+    try {
+      const transaction: IEsploraApi.Transaction = await bitcoinApi.$getRawTransaction(req.params.txId, true);
+      res.setHeader('content-type', 'text/plain');
+      res.send(transaction.hex);
+    } catch (e) {
+      let statusCode = 500;
+      if (e instanceof Error && e.message && e.message.indexOf('No such mempool or blockchain transaction') > -1) {
+        statusCode = 404;
+      }
+      res.status(statusCode).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getTransactionStatus(req: Request, res: Response) {
+    try {
+      const transaction = await transactionUtils.$getTransactionExtended(req.params.txId, true);
+      res.json(transaction.status);
+    } catch (e) {
+      let statusCode = 500;
+      if (e instanceof Error && e.message && e.message.indexOf('No such mempool or blockchain transaction') > -1) {
+        statusCode = 404;
+      }
+      res.status(statusCode).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getBlock(req: Request, res: Response) {
+    try {
+      const block = await blocks.$getBlock(req.params.hash);
+
+      const blockAge = new Date().getTime() / 1000 - block.timestamp;
+      const day = 24 * 3600;
+      let cacheDuration;
+      if (blockAge > 365 * day) {
+        cacheDuration = 30 * day;
+      } else if (blockAge > 30 * day) {
+        cacheDuration = 10 * day;
+      } else {
+        cacheDuration = 600
+      }
+
+      res.setHeader('Expires', new Date(Date.now() + 1000 * cacheDuration).toUTCString());
+      res.json(block);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getBlockHeader(req: Request, res: Response) {
+    try {
+      const blockHeader = await bitcoinApi.$getBlockHeader(req.params.hash);
+      res.setHeader('content-type', 'text/plain');
+      res.send(blockHeader);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getStrippedBlockTransactions(req: Request, res: Response) {
+    try {
+      const transactions = await blocks.$getStrippedBlockTransactions(req.params.hash);
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 3600 * 24 * 30).toUTCString());
+      res.json(transactions);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getBlocks(req: Request, res: Response) {
+    try {
+      if (['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK)) { // Bitcoin
+        const height = req.params.height === undefined ? undefined : parseInt(req.params.height, 10);
+        res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+        res.json(await blocks.$getBlocks(height, 15));
+      } else { // Liquid, Bisq
+        return await this.getLegacyBlocks(req, res);
+      }
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getLegacyBlocks(req: Request, res: Response) {
+    try {
+      const returnBlocks: IEsploraApi.Block[] = [];
+      const fromHeight = parseInt(req.params.height, 10) || blocks.getCurrentBlockHeight();
+
+      // Check if block height exist in local cache to skip the hash lookup
+      const blockByHeight = blocks.getBlocks().find((b) => b.height === fromHeight);
+      let startFromHash: string | null = null;
+      if (blockByHeight) {
+        startFromHash = blockByHeight.id;
+      } else {
+        startFromHash = await bitcoinApi.$getBlockHash(fromHeight);
+      }
+
+      let nextHash = startFromHash;
+      for (let i = 0; i < 10 && nextHash; i++) {
+        const localBlock = blocks.getBlocks().find((b) => b.id === nextHash);
+        if (localBlock) {
+          returnBlocks.push(localBlock);
+          nextHash = localBlock.previousblockhash;
+        } else {
+          const block = await bitcoinApi.$getBlock(nextHash);
+          returnBlocks.push(block);
+          nextHash = block.previousblockhash;
+        }
+      }
+
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(returnBlocks);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+  
+  private async getBlockTransactions(req: Request, res: Response) {
+    try {
+      loadingIndicators.setProgress('blocktxs-' + req.params.hash, 0);
+
+      const txIds = await bitcoinApi.$getTxIdsForBlock(req.params.hash);
+      const transactions: TransactionExtended[] = [];
+      const startingIndex = Math.max(0, parseInt(req.params.index || '0', 10));
+
+      const endIndex = Math.min(startingIndex + 10, txIds.length);
+      for (let i = startingIndex; i < endIndex; i++) {
+        try {
+          const transaction = await transactionUtils.$getTransactionExtended(txIds[i], true, true);
+          transactions.push(transaction);
+          loadingIndicators.setProgress('blocktxs-' + req.params.hash, (i - startingIndex + 1) / (endIndex - startingIndex) * 100);
+        } catch (e) {
+          logger.debug('getBlockTransactions error: ' + (e instanceof Error ? e.message : e));
+        }
+      }
+      res.json(transactions);
+    } catch (e) {
+      loadingIndicators.setProgress('blocktxs-' + req.params.hash, 100);
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getBlockHeight(req: Request, res: Response) {
+    try {
+      const blockHash = await bitcoinApi.$getBlockHash(parseInt(req.params.height, 10));
+      res.send(blockHash);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getAddress(req: Request, res: Response) {
+    if (config.MEMPOOL.BACKEND === 'none') {
+      res.status(405).send('Address lookups cannot be used with bitcoind as backend.');
+      return;
+    }
+
+    try {
+      const addressData = await bitcoinApi.$getAddress(req.params.address);
+      res.json(addressData);
+    } catch (e) {
+      if (e instanceof Error && e.message && (e.message.indexOf('too long') > 0 || e.message.indexOf('confirmed status') > 0)) {
+        return res.status(413).send(e instanceof Error ? e.message : e);
+      }
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getAddressTransactions(req: Request, res: Response) {
+    if (config.MEMPOOL.BACKEND === 'none') {
+      res.status(405).send('Address lookups cannot be used with bitcoind as backend.');
+      return;
+    }
+
+    try {
+      const transactions = await bitcoinApi.$getAddressTransactions(req.params.address, req.params.txId);
+      res.json(transactions);
+    } catch (e) {
+      if (e instanceof Error && e.message && (e.message.indexOf('too long') > 0 || e.message.indexOf('confirmed status') > 0)) {
+        return res.status(413).send(e instanceof Error ? e.message : e);
+      }
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getAdressTxChain(req: Request, res: Response) {
+    res.status(501).send('Not implemented');
+  }
+
+  private async getAddressPrefix(req: Request, res: Response) {
+    try {
+      const blockHash = await bitcoinApi.$getAddressPrefix(req.params.prefix);
+      res.send(blockHash);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getRecentMempoolTransactions(req: Request, res: Response) {
+    const latestTransactions = Object.entries(mempool.getMempool())
+      .sort((a, b) => (b[1].firstSeen || 0) - (a[1].firstSeen || 0))
+      .slice(0, 10).map((tx) => Common.stripTransaction(tx[1]));
+
+    res.json(latestTransactions);
+  }
+
+  private async getMempool(req: Request, res: Response) {
+    const info = mempool.getMempoolInfo();
+    res.json({
+      count: info.size,
+      vsize: info.bytes,
+      total_fee: info.total_fee * 1e8,
+      fee_histogram: []
+    });
+  }
+
+  private async getMempoolTxIds(req: Request, res: Response) {
+    try {
+      const rawMempool = await bitcoinApi.$getRawMempool();
+      res.send(rawMempool);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getBlockTipHeight(req: Request, res: Response) {
+    try {
+      const result = await bitcoinApi.$getBlockHeightTip();
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getBlockTipHash(req: Request, res: Response) {
+    try {
+      const result = await bitcoinApi.$getBlockHashTip();
+      res.setHeader('content-type', 'text/plain');
+      res.send(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getRawBlock(req: Request, res: Response) {
+    try {
+      const result = await bitcoinApi.$getRawBlock(req.params.hash);
+      res.setHeader('content-type', 'application/octet-stream');
+      res.send(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getTxIdsForBlock(req: Request, res: Response) {
+    try {
+      const result = await bitcoinApi.$getTxIdsForBlock(req.params.hash);
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async validateAddress(req: Request, res: Response) {
+    try {
+      const result = await bitcoinClient.validateAddress(req.params.address);
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async getTransactionOutspends(req: Request, res: Response) {
+    try {
+      const result = await bitcoinApi.$getOutspends(req.params.txId);
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private getDifficultyChange(req: Request, res: Response) {
+    try {
+      res.json(difficultyAdjustment.getDifficultyAdjustment());
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $postTransaction(req: Request, res: Response) {
+    res.setHeader('content-type', 'text/plain');
+    try {
+      let rawTx;
+      if (typeof req.body === 'object') {
+        rawTx = Object.keys(req.body)[0];
+      } else {
+        rawTx = req.body;
+      }
+      const txIdResult = await bitcoinApi.$sendRawTransaction(rawTx);
+      res.send(txIdResult);
+    } catch (e: any) {
+      res.status(400).send(e.message && e.code ? 'sendrawtransaction RPC error: ' + JSON.stringify({ code: e.code, message: e.message })
+        : (e.message || 'Error'));
+    }
+  }
+
+  private async $postTransactionForm(req: Request, res: Response) {
+    res.setHeader('content-type', 'text/plain');
+    const matches = /tx=([a-z0-9]+)/.exec(req.body);
+    let txHex = '';
+    if (matches && matches[1]) {
+      txHex = matches[1];
+    }
+    try {
+      const txIdResult = await bitcoinClient.sendRawTransaction(txHex);
+      res.send(txIdResult);
+    } catch (e: any) {
+      res.status(400).send(e.message && e.code ? 'sendrawtransaction RPC error: ' + JSON.stringify({ code: e.code, message: e.message })
+        : (e.message || 'Error'));
+    }
+  }
+
+}
+
+export default new BitcoinRoutes();

backend/src/api/bitcoin/electrum-api.ts

@@ -1,22 +1,19 @@
 import config from '../../config';
+import Client from '@mempool/electrum-client';
 import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
-import { IBitcoinApi } from './bitcoin-api.interface';
 import { IEsploraApi } from './esplora-api.interface';
 import { IElectrumApi } from './electrum-api.interface';
 import BitcoinApi from './bitcoin-api';
-import mempool from '../mempool';
 import logger from '../../logger';
-import * as ElectrumClient from '@mempool/electrum-client';
-import * as sha256 from 'crypto-js/sha256';
-import * as hexEnc from 'crypto-js/enc-hex';
+import crypto from "crypto-js";
 import loadingIndicators from '../loading-indicators';
 import memoryCache from '../memory-cache';
 
 class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
   private electrumClient: any;
 
-  constructor() {
-    super();
+  constructor(bitcoinClient: any) {
+    super(bitcoinClient);
 
     const electrumConfig = { client: 'mempool-v2', version: '1.4' };
     const electrumPersistencePolicy = { retryPeriod: 10000, maxRetry: 1000, callback: null };
@@ -28,7 +25,7 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
       onLog: (str) => { logger.debug(str); },
     };
 
-    this.electrumClient = new ElectrumClient(
+    this.electrumClient = new Client(
       config.ELECTRUM.PORT,
       config.ELECTRUM.HOST,
       config.ELECTRUM.TLS_ENABLED ? 'tls' : 'tcp',
@@ -37,33 +34,14 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
     );
 
     this.electrumClient.initElectrum(electrumConfig, electrumPersistencePolicy)
-      .then(() => {})
+      .then(() => { })
       .catch((err) => {
         logger.err(`Error connecting to Electrum Server at ${config.ELECTRUM.HOST}:${config.ELECTRUM.PORT}`);
       });
   }
 
-  async $getRawTransaction(txId: string, skipConversion = false, addPrevout = false): Promise<IEsploraApi.Transaction> {
-    if (!config.ELECTRUM.TX_LOOKUPS) {
-      return super.$getRawTransaction(txId, skipConversion, addPrevout);
-    }
-    const txInMempool = mempool.getMempool()[txId];
-    if (txInMempool && addPrevout) {
-      return this.$addPrevouts(txInMempool);
-    }
-    const transaction: IBitcoinApi.Transaction = await this.electrumClient.blockchainTransaction_get(txId, true);
-    if (!transaction) {
-      throw new Error('Unable to get transaction: ' + txId);
-    }
-    if (skipConversion) {
-      // @ts-ignore
-      return transaction;
-    }
-    return this.$convertTransaction(transaction, addPrevout);
-  }
-
   async $getAddress(address: string): Promise<IEsploraApi.Address> {
-    const addressInfo = await this.$validateAddress(address);
+    const addressInfo = await this.bitcoindClient.validateAddress(address);
     if (!addressInfo || !addressInfo.isvalid) {
       return ({
         'address': address,
@@ -105,20 +83,18 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
           'spent_txo_count': 0,
           'spent_txo_sum': balance.unconfirmed < 0 ? -balance.unconfirmed : 0,
           'tx_count': unconfirmed,
-        }
+        },
+        'electrum': true,
       };
-    } catch (e) {
-      if (e === 'failed to get confirmed status') {
-        e = 'The number of transactions on this address exceeds the Electrum server limit';
-      }
-      throw new Error(e);
+    } catch (e: any) {
+      throw new Error(typeof e === 'string' ? e : e && e.message || e);
     }
   }
 
   async $getAddressTransactions(address: string, lastSeenTxId: string): Promise<IEsploraApi.Transaction[]> {
-    const addressInfo = await this.$validateAddress(address);
+    const addressInfo = await this.bitcoindClient.validateAddress(address);
     if (!addressInfo || !addressInfo.isvalid) {
-     return [];
+      return [];
     }
 
     try {
@@ -144,12 +120,9 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
       }
 
       return transactions;
-    } catch (e) {
+    } catch (e: any) {
       loadingIndicators.setProgress('address-' + address, 100);
-      if (e === 'failed to get confirmed status') {
-        e = 'The number of transactions on this address exceeds the Electrum server limit';
-      }
-      throw new Error(e);
+      throw new Error(typeof e === 'string' ? e : e && e.message || e);
     }
   }
 
@@ -170,8 +143,8 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
   }
 
   private encodeScriptHash(scriptPubKey: string): string {
-    const addrScripthash = hexEnc.stringify(sha256(hexEnc.parse(scriptPubKey)));
-    return addrScripthash.match(/.{2}/g).reverse().join('');
+    const addrScripthash = crypto.enc.Hex.stringify(crypto.SHA256(crypto.enc.Hex.parse(scriptPubKey)));
+    return addrScripthash!.match(/.{2}/g)!.reverse().join('');
   }
 
 }

backend/src/api/bitcoin/esplora-api.interface.ts

@@ -9,6 +9,7 @@ export namespace IEsploraApi {
     vin: Vin[];
     vout: Vout[];
     status: Status;
+    hex?: string;
   }
 
   export interface Recent {
@@ -24,14 +25,16 @@ export namespace IEsploraApi {
     is_coinbase: boolean;
     scriptsig: string;
     scriptsig_asm: string;
-    inner_redeemscript_asm?: string;
-    inner_witnessscript_asm?: string;
+    inner_redeemscript_asm: string;
+    inner_witnessscript_asm: string;
     sequence: any;
-    witness?: string[];
+    witness: string[];
     prevout: Vout | null;
     // Elements
     is_pegin?: boolean;
     issuance?: Issuance;
+    // Custom
+    lazy?: boolean;
   }
 
   interface Issuance {
@@ -91,6 +94,7 @@ export namespace IEsploraApi {
     address: string;
     chain_stats: ChainStats;
     mempool_stats: MempoolStats;
+    electrum?: boolean;
   }
 
   export interface ChainStats {
@@ -111,9 +115,9 @@ export namespace IEsploraApi {
 
   export interface Outspend {
     spent: boolean;
-    txid: string;
-    vin: number;
-    status: Status;
+    txid?: string;
+    vin?: number;
+    status?: Status;
   }
 
   export interface Asset {

backend/src/api/bitcoin/esplora-api.ts

@@ -1,39 +1,57 @@
 import config from '../../config';
-import axios from 'axios';
+import axios, { AxiosRequestConfig } from 'axios';
 import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
 import { IEsploraApi } from './esplora-api.interface';
 
 class ElectrsApi implements AbstractBitcoinApi {
+  axiosConfig: AxiosRequestConfig = {
+    timeout: 10000,
+  };
 
   constructor() { }
 
   $getRawMempool(): Promise<IEsploraApi.Transaction['txid'][]> {
-    return axios.get<IEsploraApi.Transaction['txid'][]>(config.ESPLORA.REST_API_URL + '/mempool/txids')
+    return axios.get<IEsploraApi.Transaction['txid'][]>(config.ESPLORA.REST_API_URL + '/mempool/txids', this.axiosConfig)
       .then((response) => response.data);
   }
 
   $getRawTransaction(txId: string): Promise<IEsploraApi.Transaction> {
-    return axios.get<IEsploraApi.Transaction>(config.ESPLORA.REST_API_URL + '/tx/' + txId)
+    return axios.get<IEsploraApi.Transaction>(config.ESPLORA.REST_API_URL + '/tx/' + txId, this.axiosConfig)
       .then((response) => response.data);
   }
 
   $getBlockHeightTip(): Promise<number> {
-    return axios.get<number>(config.ESPLORA.REST_API_URL + '/blocks/tip/height')
+    return axios.get<number>(config.ESPLORA.REST_API_URL + '/blocks/tip/height', this.axiosConfig)
+      .then((response) => response.data);
+  }
+
+  $getBlockHashTip(): Promise<string> {
+    return axios.get<string>(config.ESPLORA.REST_API_URL + '/blocks/tip/hash', this.axiosConfig)
       .then((response) => response.data);
   }
 
   $getTxIdsForBlock(hash: string): Promise<string[]> {
-    return axios.get<string[]>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/txids')
+    return axios.get<string[]>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/txids', this.axiosConfig)
       .then((response) => response.data);
   }
 
   $getBlockHash(height: number): Promise<string> {
-    return axios.get<string>(config.ESPLORA.REST_API_URL + '/block-height/' + height)
+    return axios.get<string>(config.ESPLORA.REST_API_URL + '/block-height/' + height, this.axiosConfig)
+      .then((response) => response.data);
+  }
+
+  $getBlockHeader(hash: string): Promise<string> {
+    return axios.get<string>(config.ESPLORA.REST_API_URL + '/block/' + hash + '/header', this.axiosConfig)
       .then((response) => response.data);
   }
 
   $getBlock(hash: string): Promise<IEsploraApi.Block> {
-    return axios.get<IEsploraApi.Block>(config.ESPLORA.REST_API_URL + '/block/' + hash)
+    return axios.get<IEsploraApi.Block>(config.ESPLORA.REST_API_URL + '/block/' + hash, this.axiosConfig)
+      .then((response) => response.data);
+  }
+
+  $getRawBlock(hash: string): Promise<string> {
+    return axios.get<string>(config.ESPLORA.REST_API_URL + '/block/' + hash + "/raw", this.axiosConfig)
       .then((response) => response.data);
   }
 
@@ -45,13 +63,31 @@ class ElectrsApi implements AbstractBitcoinApi {
     throw new Error('Method getAddressTransactions not implemented.');
   }
 
-  $getRawTransactionBitcoind(txId: string): Promise<IEsploraApi.Transaction> {
-    return axios.get<IEsploraApi.Transaction>(config.ESPLORA.REST_API_URL + '/tx/' + txId)
+  $getAddressPrefix(prefix: string): string[] {
+    throw new Error('Method not implemented.');
+  }
+
+  $sendRawTransaction(rawTransaction: string): Promise<string> {
+    throw new Error('Method not implemented.');
+  }
+
+  $getOutspend(txId: string, vout: number): Promise<IEsploraApi.Outspend> {
+    return axios.get<IEsploraApi.Outspend>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/outspend/' + vout, this.axiosConfig)
       .then((response) => response.data);
   }
 
-  $getAddressPrefix(prefix: string): string[] {
-    throw new Error('Method not implemented.');
+  $getOutspends(txId: string): Promise<IEsploraApi.Outspend[]> {
+    return axios.get<IEsploraApi.Outspend[]>(config.ESPLORA.REST_API_URL + '/tx/' + txId + '/outspends', this.axiosConfig)
+      .then((response) => response.data);
+  }
+
+  async $getBatchedOutspends(txId: string[]): Promise<IEsploraApi.Outspend[][]> {
+    const outspends: IEsploraApi.Outspend[][] = [];
+    for (const tx of txId) {
+      const outspend = await this.$getOutspends(tx);
+      outspends.push(outspend);
+    }
+    return outspends;
   }
 }
 

backend/src/api/blocks.ts

@@ -2,16 +2,34 @@ import config from '../config';
 import bitcoinApi from './bitcoin/bitcoin-api-factory';
 import logger from '../logger';
 import memPool from './mempool';
-import { BlockExtended, TransactionExtended } from '../mempool.interfaces';
+import { BlockExtended, BlockSummary, PoolTag, TransactionExtended, TransactionStripped, TransactionMinerInfo } from '../mempool.interfaces';
 import { Common } from './common';
 import diskCache from './disk-cache';
 import transactionUtils from './transaction-utils';
+import bitcoinClient from './bitcoin/bitcoin-client';
+import { IBitcoinApi } from './bitcoin/bitcoin-api.interface';
+import { IEsploraApi } from './bitcoin/esplora-api.interface';
+import poolsRepository from '../repositories/PoolsRepository';
+import blocksRepository from '../repositories/BlocksRepository';
+import loadingIndicators from './loading-indicators';
+import BitcoinApi from './bitcoin/bitcoin-api';
+import { prepareBlock } from '../utils/blocks-utils';
+import BlocksRepository from '../repositories/BlocksRepository';
+import HashratesRepository from '../repositories/HashratesRepository';
+import indexer from '../indexer';
+import fiatConversion from './fiat-conversion';
+import poolsParser from './pools-parser';
+import BlocksSummariesRepository from '../repositories/BlocksSummariesRepository';
+import mining from './mining/mining';
+import DifficultyAdjustmentsRepository from '../repositories/DifficultyAdjustmentsRepository';
 
 class Blocks {
-  private static INITIAL_BLOCK_AMOUNT = 8;
   private blocks: BlockExtended[] = [];
+  private blockSummaries: BlockSummary[] = [];
   private currentBlockHeight = 0;
+  private currentDifficulty = 0;
   private lastDifficultyAdjustmentTime = 0;
+  private previousDifficultyRetarget = 0;
   private newBlockCallbacks: ((block: BlockExtended, txIds: string[], transactions: TransactionExtended[]) => void)[] = [];
 
   constructor() { }
@@ -24,106 +42,592 @@ class Blocks {
     this.blocks = blocks;
   }
 
+  public getBlockSummaries(): BlockSummary[] {
+    return this.blockSummaries;
+  }
+
+  public setBlockSummaries(blockSummaries: BlockSummary[]) {
+    this.blockSummaries = blockSummaries;
+  }
+
   public setNewBlockCallback(fn: (block: BlockExtended, txIds: string[], transactions: TransactionExtended[]) => void) {
     this.newBlockCallbacks.push(fn);
   }
 
+  /**
+   * Return the list of transaction for a block
+   * @param blockHash
+   * @param blockHeight
+   * @param onlyCoinbase - Set to true if you only need the coinbase transaction
+   * @returns Promise<TransactionExtended[]>
+   */
+  private async $getTransactionsExtended(
+    blockHash: string,
+    blockHeight: number,
+    onlyCoinbase: boolean,
+    quiet: boolean = false,
+  ): Promise<TransactionExtended[]> {
+    const transactions: TransactionExtended[] = [];
+    const txIds: string[] = await bitcoinApi.$getTxIdsForBlock(blockHash);
+
+    const mempool = memPool.getMempool();
+    let transactionsFound = 0;
+    let transactionsFetched = 0;
+
+    for (let i = 0; i < txIds.length; i++) {
+      if (mempool[txIds[i]]) {
+        // We update blocks before the mempool (index.ts), therefore we can
+        // optimize here by directly fetching txs in the "outdated" mempool
+        transactions.push(mempool[txIds[i]]);
+        transactionsFound++;
+      } else if (config.MEMPOOL.BACKEND === 'esplora' || !memPool.hasPriority() || i === 0) {
+        // Otherwise we fetch the tx data through backend services (esplora, electrum, core rpc...)
+        if (!quiet && (i % (Math.round((txIds.length) / 10)) === 0 || i + 1 === txIds.length)) { // Avoid log spam
+          logger.debug(`Indexing tx ${i + 1} of ${txIds.length} in block #${blockHeight}`);
+        }
+        try {
+          const tx = await transactionUtils.$getTransactionExtended(txIds[i]);
+          transactions.push(tx);
+          transactionsFetched++;
+        } catch (e) {
+          if (i === 0) {
+            const msg = `Cannot fetch coinbase tx ${txIds[i]}. Reason: ` + (e instanceof Error ? e.message : e); 
+            logger.err(msg);
+            throw new Error(msg);
+          } else {
+            logger.err(`Cannot fetch tx ${txIds[i]}. Reason: ` + (e instanceof Error ? e.message : e));
+          }
+        }
+      }
+
+      if (onlyCoinbase === true) {
+        break; // Fetch the first transaction and exit
+      }
+    }
+
+    transactions.forEach((tx) => {
+      if (!tx.cpfpChecked) {
+        Common.setRelativesAndGetCpfpInfo(tx, mempool); // Child Pay For Parent
+      }
+    });
+
+    if (!quiet) {
+      logger.debug(`${transactionsFound} of ${txIds.length} found in mempool. ${transactionsFetched} fetched through backend service.`);
+    }
+
+    return transactions;
+  }
+
+  /**
+   * Return a block summary (list of stripped transactions)
+   * @param block
+   * @returns BlockSummary
+   */
+  private summarizeBlock(block: IBitcoinApi.VerboseBlock): BlockSummary {
+    const stripped = block.tx.map((tx) => {
+      return {
+        txid: tx.txid,
+        vsize: tx.vsize,
+        fee: tx.fee ? Math.round(tx.fee * 100000000) : 0,
+        value: Math.round(tx.vout.reduce((acc, vout) => acc + (vout.value ? vout.value : 0), 0) * 100000000)
+      };
+    });
+
+    return {
+      id: block.hash,
+      transactions: stripped
+    };
+  }
+
+  /**
+   * Return a block with additional data (reward, coinbase, fees...)
+   * @param block
+   * @param transactions
+   * @returns BlockExtended
+   */
+  private async $getBlockExtended(block: IEsploraApi.Block, transactions: TransactionExtended[]): Promise<BlockExtended> {
+    const blockExtended: BlockExtended = Object.assign({ extras: {} }, block);
+    blockExtended.extras.reward = transactions[0].vout.reduce((acc, curr) => acc + curr.value, 0);
+    blockExtended.extras.coinbaseTx = transactionUtils.stripCoinbaseTransaction(transactions[0]);
+    blockExtended.extras.coinbaseRaw = blockExtended.extras.coinbaseTx.vin[0].scriptsig;
+    blockExtended.extras.usd = fiatConversion.getConversionRates().USD;
+
+    if (block.height === 0) {
+      blockExtended.extras.medianFee = 0; // 50th percentiles
+      blockExtended.extras.feeRange = [0, 0, 0, 0, 0, 0, 0];
+      blockExtended.extras.totalFees = 0;
+      blockExtended.extras.avgFee = 0;
+      blockExtended.extras.avgFeeRate = 0;
+    } else {
+      const stats = await bitcoinClient.getBlockStats(block.id, [
+        'feerate_percentiles', 'minfeerate', 'maxfeerate', 'totalfee', 'avgfee', 'avgfeerate'
+      ]);
+      blockExtended.extras.medianFee = stats.feerate_percentiles[2]; // 50th percentiles
+      blockExtended.extras.feeRange = [stats.minfeerate, stats.feerate_percentiles, stats.maxfeerate].flat();
+      blockExtended.extras.totalFees = stats.totalfee;
+      blockExtended.extras.avgFee = stats.avgfee;
+      blockExtended.extras.avgFeeRate = stats.avgfeerate;
+    }
+
+    if (['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK)) {
+      let pool: PoolTag;
+      if (blockExtended.extras?.coinbaseTx !== undefined) {
+        pool = await this.$findBlockMiner(blockExtended.extras?.coinbaseTx);
+      } else {
+        if (config.DATABASE.ENABLED === true) {
+          pool = await poolsRepository.$getUnknownPool();
+        } else {
+          pool = poolsParser.unknownPool;
+        }
+      }
+
+      if (!pool) { // We should never have this situation in practise
+        logger.warn(`Cannot assign pool to block ${blockExtended.height} and 'unknown' pool does not exist. ` +
+          `Check your "pools" table entries`);
+        return blockExtended;
+      }
+
+      blockExtended.extras.pool = {
+        id: pool.id,
+        name: pool.name,
+        slug: pool.slug,
+      };
+    }
+
+    return blockExtended;
+  }
+
+  /**
+   * Try to find which miner found the block
+   * @param txMinerInfo
+   * @returns
+   */
+  private async $findBlockMiner(txMinerInfo: TransactionMinerInfo | undefined): Promise<PoolTag> {
+    if (txMinerInfo === undefined || txMinerInfo.vout.length < 1) {
+      if (config.DATABASE.ENABLED === true) {
+        return await poolsRepository.$getUnknownPool();
+      } else {
+        return poolsParser.unknownPool;
+      }
+    }
+
+    const asciiScriptSig = transactionUtils.hex2ascii(txMinerInfo.vin[0].scriptsig);
+    const address = txMinerInfo.vout[0].scriptpubkey_address;
+
+    let pools: PoolTag[] = [];
+    if (config.DATABASE.ENABLED === true) {
+      pools = await poolsRepository.$getPools();
+    } else {
+      pools = poolsParser.miningPools;
+    }
+    for (let i = 0; i < pools.length; ++i) {
+      if (address !== undefined) {
+        const addresses: string[] = JSON.parse(pools[i].addresses);
+        if (addresses.indexOf(address) !== -1) {
+          return pools[i];
+        }
+      }
+
+      const regexes: string[] = JSON.parse(pools[i].regexes);
+      for (let y = 0; y < regexes.length; ++y) {
+        const regex = new RegExp(regexes[y], 'i');
+        const match = asciiScriptSig.match(regex);
+        if (match !== null) {
+          return pools[i];
+        }
+      }
+    }
+
+    if (config.DATABASE.ENABLED === true) {
+      return await poolsRepository.$getUnknownPool();
+    } else {
+      return poolsParser.unknownPool;
+    }
+  }
+
+  /**
+   * [INDEXING] Index all blocks summaries for the block txs visualization
+   */
+  public async $generateBlocksSummariesDatabase() {
+    if (Common.blocksSummariesIndexingEnabled() === false) {
+      return;
+    }
+
+    try {
+      // Get all indexed block hash
+      const indexedBlocks = await blocksRepository.$getIndexedBlocks();
+      const indexedBlockSummariesHashesArray = await BlocksSummariesRepository.$getIndexedSummariesId();
+
+      const indexedBlockSummariesHashes = {}; // Use a map for faster seek during the indexing loop
+      for (const hash of indexedBlockSummariesHashesArray) {
+        indexedBlockSummariesHashes[hash] = true;
+      }
+
+      // Logging
+      let newlyIndexed = 0;
+      let totalIndexed = indexedBlockSummariesHashesArray.length;
+      let indexedThisRun = 0;
+      let timer = new Date().getTime() / 1000;
+      const startedAt = new Date().getTime() / 1000;
+
+      for (const block of indexedBlocks) {
+        if (indexedBlockSummariesHashes[block.hash] === true) {
+          continue;
+        }
+
+        // Logging
+        const elapsedSeconds = Math.max(1, Math.round((new Date().getTime() / 1000) - timer));
+        if (elapsedSeconds > 5) {
+          const runningFor = Math.max(1, Math.round((new Date().getTime() / 1000) - startedAt));
+          const blockPerSeconds = Math.max(1, indexedThisRun / elapsedSeconds);
+          const progress = Math.round(totalIndexed / indexedBlocks.length * 10000) / 100;
+          logger.debug(`Indexing block summary for #${block.height} | ~${blockPerSeconds.toFixed(2)} blocks/sec | total: ${totalIndexed}/${indexedBlocks.length} (${progress}%) | elapsed: ${runningFor} seconds`);
+          timer = new Date().getTime() / 1000;
+          indexedThisRun = 0;
+        }
+
+        await this.$getStrippedBlockTransactions(block.hash, true, true); // This will index the block summary
+
+        // Logging
+        indexedThisRun++;
+        totalIndexed++;
+        newlyIndexed++;
+      }
+      if (newlyIndexed > 0) {
+        logger.notice(`Blocks summaries indexing completed: indexed ${newlyIndexed} blocks`);
+      } else {
+        logger.debug(`Blocks summaries indexing completed: indexed ${newlyIndexed} blocks`);
+      }
+    } catch (e) {
+      logger.err(`Blocks summaries indexing failed. Trying again in 10 seconds. Reason: ${(e instanceof Error ? e.message : e)}`);
+      throw e;
+    }
+  }
+
+  /**
+   * [INDEXING] Index all blocks metadata for the mining dashboard
+   */
+  public async $generateBlockDatabase(): Promise<boolean> {
+    try {
+      const blockchainInfo = await bitcoinClient.getBlockchainInfo();
+      let currentBlockHeight = blockchainInfo.blocks;
+
+      let indexingBlockAmount = Math.min(config.MEMPOOL.INDEXING_BLOCKS_AMOUNT, blockchainInfo.blocks);
+      if (indexingBlockAmount <= -1) {
+        indexingBlockAmount = currentBlockHeight + 1;
+      }
+
+      const lastBlockToIndex = Math.max(0, currentBlockHeight - indexingBlockAmount + 1);
+
+      logger.debug(`Indexing blocks from #${currentBlockHeight} to #${lastBlockToIndex}`);
+      loadingIndicators.setProgress('block-indexing', 0);
+
+      const chunkSize = 10000;
+      let totalIndexed = await blocksRepository.$blockCountBetweenHeight(currentBlockHeight, lastBlockToIndex);
+      let indexedThisRun = 0;
+      let newlyIndexed = 0;
+      const startedAt = new Date().getTime() / 1000;
+      let timer = new Date().getTime() / 1000;
+
+      while (currentBlockHeight >= lastBlockToIndex) {
+        const endBlock = Math.max(0, lastBlockToIndex, currentBlockHeight - chunkSize + 1);
+
+        const missingBlockHeights: number[] = await blocksRepository.$getMissingBlocksBetweenHeights(
+          currentBlockHeight, endBlock);
+        if (missingBlockHeights.length <= 0) {
+          currentBlockHeight -= chunkSize;
+          continue;
+        }
+
+        logger.info(`Indexing ${missingBlockHeights.length} blocks from #${currentBlockHeight} to #${endBlock}`);
+
+        for (const blockHeight of missingBlockHeights) {
+          if (blockHeight < lastBlockToIndex) {
+            break;
+          }
+          ++indexedThisRun;
+          ++totalIndexed;
+          const elapsedSeconds = Math.max(1, Math.round((new Date().getTime() / 1000) - timer));
+          if (elapsedSeconds > 5 || blockHeight === lastBlockToIndex) {
+            const runningFor = Math.max(1, Math.round((new Date().getTime() / 1000) - startedAt));
+            const blockPerSeconds = Math.max(1, indexedThisRun / elapsedSeconds);
+            const progress = Math.round(totalIndexed / indexingBlockAmount * 10000) / 100;
+            logger.debug(`Indexing block #${blockHeight} | ~${blockPerSeconds.toFixed(2)} blocks/sec | total: ${totalIndexed}/${indexingBlockAmount} (${progress}%) | elapsed: ${runningFor} seconds`);
+            timer = new Date().getTime() / 1000;
+            indexedThisRun = 0;
+            loadingIndicators.setProgress('block-indexing', progress, false);
+          }
+          const blockHash = await bitcoinApi.$getBlockHash(blockHeight);
+          const block = BitcoinApi.convertBlock(await bitcoinClient.getBlock(blockHash));
+          const transactions = await this.$getTransactionsExtended(blockHash, block.height, true, true);
+          const blockExtended = await this.$getBlockExtended(block, transactions);
+
+          newlyIndexed++;
+          await blocksRepository.$saveBlockInDatabase(blockExtended);
+        }
+
+        currentBlockHeight -= chunkSize;
+      }
+      if (newlyIndexed > 0) {
+        logger.notice(`Block indexing completed: indexed ${newlyIndexed} blocks`);
+      } else {
+        logger.debug(`Block indexing completed: indexed ${newlyIndexed} blocks`);
+      }
+      loadingIndicators.setProgress('block-indexing', 100);
+    } catch (e) {
+      logger.err('Block indexing failed. Trying again in 10 seconds. Reason: ' + (e instanceof Error ? e.message : e));
+      loadingIndicators.setProgress('block-indexing', 100);
+      throw e;
+    }
+
+    return await BlocksRepository.$validateChain();
+  }
+
   public async $updateBlocks() {
+    let fastForwarded = false;
     const blockHeightTip = await bitcoinApi.$getBlockHeightTip();
 
     if (this.blocks.length === 0) {
-      this.currentBlockHeight = blockHeightTip - Blocks.INITIAL_BLOCK_AMOUNT;
+      this.currentBlockHeight = Math.max(blockHeightTip - config.MEMPOOL.INITIAL_BLOCKS_AMOUNT, -1);
     } else {
       this.currentBlockHeight = this.blocks[this.blocks.length - 1].height;
     }
 
-    if (blockHeightTip - this.currentBlockHeight > Blocks.INITIAL_BLOCK_AMOUNT * 2) {
-      logger.info(`${blockHeightTip - this.currentBlockHeight} blocks since tip. Fast forwarding to the ${Blocks.INITIAL_BLOCK_AMOUNT} recent blocks`);
-      this.currentBlockHeight = blockHeightTip - Blocks.INITIAL_BLOCK_AMOUNT;
+    if (blockHeightTip - this.currentBlockHeight > config.MEMPOOL.INITIAL_BLOCKS_AMOUNT * 2) {
+      logger.info(`${blockHeightTip - this.currentBlockHeight} blocks since tip. Fast forwarding to the ${config.MEMPOOL.INITIAL_BLOCKS_AMOUNT} recent blocks`);
+      this.currentBlockHeight = blockHeightTip - config.MEMPOOL.INITIAL_BLOCKS_AMOUNT;
+      fastForwarded = true;
+      logger.info(`Re-indexing skipped blocks and corresponding hashrates data`);
+      indexer.reindex(); // Make sure to index the skipped blocks #1619
     }
 
     if (!this.lastDifficultyAdjustmentTime) {
-      const heightDiff = blockHeightTip % 2016;
-      const blockHash = await bitcoinApi.$getBlockHash(blockHeightTip - heightDiff);
-      const block = await bitcoinApi.$getBlock(blockHash);
-      this.lastDifficultyAdjustmentTime = block.timestamp;
+      const blockchainInfo = await bitcoinClient.getBlockchainInfo();
+      if (blockchainInfo.blocks === blockchainInfo.headers) {
+        const heightDiff = blockHeightTip % 2016;
+        const blockHash = await bitcoinApi.$getBlockHash(blockHeightTip - heightDiff);
+        const block = BitcoinApi.convertBlock(await bitcoinClient.getBlock(blockHash));
+        this.lastDifficultyAdjustmentTime = block.timestamp;
+        this.currentDifficulty = block.difficulty;
+
+        if (blockHeightTip >= 2016) {
+          const previousPeriodBlockHash = await bitcoinApi.$getBlockHash(blockHeightTip - heightDiff - 2016);
+          const previousPeriodBlock = await bitcoinClient.getBlock(previousPeriodBlockHash)
+          this.previousDifficultyRetarget = (block.difficulty - previousPeriodBlock.difficulty) / previousPeriodBlock.difficulty * 100;
+          logger.debug(`Initial difficulty adjustment data set.`);
+        }
+      } else {
+        logger.debug(`Blockchain headers (${blockchainInfo.headers}) and blocks (${blockchainInfo.blocks}) not in sync. Waiting...`);
+      }
     }
 
     while (this.currentBlockHeight < blockHeightTip) {
-      if (this.currentBlockHeight === 0) {
+      if (this.currentBlockHeight < blockHeightTip - config.MEMPOOL.INITIAL_BLOCKS_AMOUNT) {
         this.currentBlockHeight = blockHeightTip;
       } else {
         this.currentBlockHeight++;
         logger.debug(`New block found (#${this.currentBlockHeight})!`);
       }
 
-      const transactions: TransactionExtended[] = [];
-
       const blockHash = await bitcoinApi.$getBlockHash(this.currentBlockHeight);
-      const block = await bitcoinApi.$getBlock(blockHash);
+      const verboseBlock = await bitcoinClient.getBlock(blockHash, 2);
+      const block = BitcoinApi.convertBlock(verboseBlock);
       const txIds: string[] = await bitcoinApi.$getTxIdsForBlock(blockHash);
+      const transactions = await this.$getTransactionsExtended(blockHash, block.height, false);
+      const blockExtended: BlockExtended = await this.$getBlockExtended(block, transactions);
+      const blockSummary: BlockSummary = this.summarizeBlock(verboseBlock);
 
-      const mempool = memPool.getMempool();
-      let transactionsFound = 0;
-
-      for (let i = 0; i < txIds.length; i++) {
-        // When using bitcoind, just fetch the coinbase tx for now
-        if (config.MEMPOOL.BACKEND !== 'esplora' && i === 0) {
-          let txFound = false;
-          let findCoinbaseTxTries = 0;
-          // It takes Electrum Server a few seconds to index the transaction after a block is found
-          while (findCoinbaseTxTries < 5 && !txFound) {
-            const tx = await transactionUtils.$getTransactionExtended(txIds[i]);
-            if (tx) {
-              txFound = true;
-              transactions.push(tx);
-            } else {
-              await Common.sleep(1000);
-              findCoinbaseTxTries++;
+      if (Common.indexingEnabled()) {
+        if (!fastForwarded) {
+          const lastBlock = await blocksRepository.$getBlockByHeight(blockExtended.height - 1);
+          if (lastBlock !== null && blockExtended.previousblockhash !== lastBlock['hash']) {
+            logger.warn(`Chain divergence detected at block ${lastBlock['height']}, re-indexing most recent data`);
+            // We assume there won't be a reorg with more than 10 block depth
+            await BlocksRepository.$deleteBlocksFrom(lastBlock['height'] - 10);
+            await HashratesRepository.$deleteLastEntries();
+            await BlocksSummariesRepository.$deleteBlocksFrom(lastBlock['height'] - 10);
+            for (let i = 10; i >= 0; --i) {
+              const newBlock = await this.$indexBlock(lastBlock['height'] - i);
+              await this.$getStrippedBlockTransactions(newBlock.id, true, true);
             }
+            await mining.$indexDifficultyAdjustments();
+            await DifficultyAdjustmentsRepository.$deleteLastAdjustment();
+            logger.info(`Re-indexed 10 blocks and summaries. Also re-indexed the last difficulty adjustments. Will re-index latest hashrates in a few seconds.`);
+            indexer.reindex();
           }
-        }
-        if (mempool[txIds[i]]) {
-          transactions.push(mempool[txIds[i]]);
-          transactionsFound++;
-        } else if (config.MEMPOOL.BACKEND === 'esplora') {
-          logger.debug(`Fetching block tx ${i} of ${txIds.length}`);
-          const tx = await transactionUtils.$getTransactionExtended(txIds[i]);
-          if (tx) {
-            transactions.push(tx);
+          await blocksRepository.$saveBlockInDatabase(blockExtended);
+
+          // Save blocks summary for visualization if it's enabled
+          if (Common.blocksSummariesIndexingEnabled() === true) {
+            await this.$getStrippedBlockTransactions(blockExtended.id, true);
           }
         }
       }
 
-      logger.debug(`${transactionsFound} of ${txIds.length} found in mempool. ${txIds.length - transactionsFound} not found.`);
-
-      const blockExtended: BlockExtended = Object.assign({}, block);
-      blockExtended.reward = transactions[0].vout.reduce((acc, curr) => acc + curr.value, 0);
-      blockExtended.coinbaseTx = transactionUtils.stripCoinbaseTransaction(transactions[0]);
-      transactions.sort((a, b) => b.feePerVsize - a.feePerVsize);
-      blockExtended.medianFee = transactions.length > 1 ? Common.median(transactions.map((tx) => tx.feePerVsize)) : 0;
-      blockExtended.feeRange = transactions.length > 1 ? Common.getFeesInRange(transactions.slice(0, transactions.length - 1), 8) : [0, 0];
-
       if (block.height % 2016 === 0) {
+        if (Common.indexingEnabled()) {
+          await DifficultyAdjustmentsRepository.$saveAdjustments({
+            time: block.timestamp,
+            height: block.height,
+            difficulty: block.difficulty,
+            adjustment: Math.round((block.difficulty / this.currentDifficulty) * 1000000) / 1000000, // Remove float point noise
+          });
+        }
+
+        this.previousDifficultyRetarget = (block.difficulty - this.currentDifficulty) / this.currentDifficulty * 100;
         this.lastDifficultyAdjustmentTime = block.timestamp;
+        this.currentDifficulty = block.difficulty;
       }
 
       this.blocks.push(blockExtended);
-      if (this.blocks.length > Blocks.INITIAL_BLOCK_AMOUNT * 4) {
-        this.blocks = this.blocks.slice(-Blocks.INITIAL_BLOCK_AMOUNT * 4);
+      if (this.blocks.length > config.MEMPOOL.INITIAL_BLOCKS_AMOUNT * 4) {
+        this.blocks = this.blocks.slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT * 4);
+      }
+      this.blockSummaries.push(blockSummary);
+      if (this.blockSummaries.length > config.MEMPOOL.INITIAL_BLOCKS_AMOUNT * 4) {
+        this.blockSummaries = this.blockSummaries.slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT * 4);
       }
 
       if (this.newBlockCallbacks.length) {
         this.newBlockCallbacks.forEach((cb) => cb(blockExtended, txIds, transactions));
       }
-      diskCache.$saveCacheToDisk();
+      if (!memPool.hasPriority()) {
+        diskCache.$saveCacheToDisk();
+      }
     }
   }
 
+  /**
+   * Index a block if it's missing from the database. Returns the block after indexing
+   */
+  public async $indexBlock(height: number): Promise<BlockExtended> {
+    const dbBlock = await blocksRepository.$getBlockByHeight(height);
+    if (dbBlock != null) {
+      return prepareBlock(dbBlock);
+    }
+
+    const blockHash = await bitcoinApi.$getBlockHash(height);
+    const block = BitcoinApi.convertBlock(await bitcoinClient.getBlock(blockHash));
+    const transactions = await this.$getTransactionsExtended(blockHash, block.height, true);
+    const blockExtended = await this.$getBlockExtended(block, transactions);
+
+    await blocksRepository.$saveBlockInDatabase(blockExtended);
+
+    return prepareBlock(blockExtended);
+  }
+
+  /**
+   * Index a block by hash if it's missing from the database. Returns the block after indexing
+   */
+  public async $getBlock(hash: string): Promise<BlockExtended | IEsploraApi.Block> {
+    // Check the memory cache
+    const blockByHash = this.getBlocks().find((b) => b.id === hash);
+    if (blockByHash) {
+      return blockByHash;
+    }
+
+    // Block has already been indexed
+    if (Common.indexingEnabled()) {
+      const dbBlock = await blocksRepository.$getBlockByHash(hash);
+      if (dbBlock != null) {
+        return prepareBlock(dbBlock);
+      }
+    }
+
+    // Not Bitcoin network, return the block as it
+    if (['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK) === false) {
+      return await bitcoinApi.$getBlock(hash);
+    }
+
+    let block = await bitcoinClient.getBlock(hash);
+    block = prepareBlock(block);
+
+    // Bitcoin network, add our custom data on top
+    const transactions = await this.$getTransactionsExtended(hash, block.height, true);
+    const blockExtended = await this.$getBlockExtended(block, transactions);
+    if (Common.indexingEnabled()) {
+      delete(blockExtended['coinbaseTx']);
+      await blocksRepository.$saveBlockInDatabase(blockExtended);
+    }
+
+    return blockExtended;
+  }
+
+  public async $getStrippedBlockTransactions(hash: string, skipMemoryCache = false,
+    skipDBLookup = false): Promise<TransactionStripped[]>
+  {
+    if (skipMemoryCache === false) {
+      // Check the memory cache
+      const cachedSummary = this.getBlockSummaries().find((b) => b.id === hash);
+      if (cachedSummary) {
+        return cachedSummary.transactions;
+      }
+    }
+
+    // Check if it's indexed in db
+    if (skipDBLookup === false && Common.blocksSummariesIndexingEnabled() === true) {
+      const indexedSummary = await BlocksSummariesRepository.$getByBlockId(hash);
+      if (indexedSummary !== undefined) {
+        return indexedSummary.transactions;
+      }
+    }
+
+    // Call Core RPC
+    const block = await bitcoinClient.getBlock(hash, 2);
+    const summary = this.summarizeBlock(block);
+
+    // Index the response if needed
+    if (Common.blocksSummariesIndexingEnabled() === true) {
+      await BlocksSummariesRepository.$saveSummary({height: block.height, mined: summary});
+    }
+
+    return summary.transactions;
+  }
+
+  public async $getBlocks(fromHeight?: number, limit: number = 15): Promise<BlockExtended[]> {
+    let currentHeight = fromHeight !== undefined ? fromHeight : await blocksRepository.$mostRecentBlockHeight();
+    const returnBlocks: BlockExtended[] = [];
+
+    if (currentHeight < 0) {
+      return returnBlocks;
+    }
+
+    // Check if block height exist in local cache to skip the hash lookup
+    const blockByHeight = this.getBlocks().find((b) => b.height === currentHeight);
+    let startFromHash: string | null = null;
+    if (blockByHeight) {
+      startFromHash = blockByHeight.id;
+    } else if (!Common.indexingEnabled()) {
+      startFromHash = await bitcoinApi.$getBlockHash(currentHeight);
+    }
+
+    let nextHash = startFromHash;
+    for (let i = 0; i < limit && currentHeight >= 0; i++) {
+      let block = this.getBlocks().find((b) => b.height === currentHeight);
+      if (block) {
+        returnBlocks.push(block);
+      } else if (Common.indexingEnabled()) {
+        block = await this.$indexBlock(currentHeight);
+        returnBlocks.push(block);
+      } else if (nextHash != null) {
+        block = prepareBlock(await bitcoinClient.getBlock(nextHash));
+        nextHash = block.previousblockhash;
+        returnBlocks.push(block);
+      }
+      currentHeight--;
+    }
+
+    return returnBlocks;
+  }
+
   public getLastDifficultyAdjustmentTime(): number {
     return this.lastDifficultyAdjustmentTime;
   }
 
+  public getPreviousDifficultyRetarget(): number {
+    return this.previousDifficultyRetarget;
+  }
+
   public getCurrentBlockHeight(): number {
     return this.currentBlockHeight;
   }

backend/src/api/common.ts

@@ -1,6 +1,15 @@
-import { TransactionExtended, TransactionStripped } from '../mempool.interfaces';
-
+import { CpfpInfo, TransactionExtended, TransactionStripped } from '../mempool.interfaces';
+import config from '../config';
 export class Common {
+  static nativeAssetId = config.MEMPOOL.NETWORK === 'liquidtestnet' ?
+    '144c654344aa716d6f3abcc1ca90e5641e4e2a7f633bc09fe3baf64585819a49'
+  : '6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d';
+  static _isLiquid = config.MEMPOOL.NETWORK === 'liquid' || config.MEMPOOL.NETWORK === 'liquidtestnet';
+
+  static isLiquid(): boolean {
+    return this._isLiquid;
+  }
+
   static median(numbers: number[]) {
     let medianNr = 0;
     const numsLen = numbers.length;
@@ -12,17 +21,28 @@ export class Common {
     return medianNr;
   }
 
+  static percentile(numbers: number[], percentile: number) {
+    if (percentile === 50) {
+      return this.median(numbers);
+    }
+    const index = Math.ceil(numbers.length * (100 - percentile) * 1e-2);
+    if (index < 0 || index > numbers.length - 1) {
+      return 0;
+    }
+    return numbers[index];
+  }
+
   static getFeesInRange(transactions: TransactionExtended[], rangeLength: number) {
-    const arr = [transactions[transactions.length - 1].feePerVsize];
+    const arr = [transactions[transactions.length - 1].effectiveFeePerVsize];
     const chunk = 1 / (rangeLength - 1);
     let itemsToAdd = rangeLength - 2;
 
     while (itemsToAdd > 0) {
-      arr.push(transactions[Math.floor(transactions.length * chunk * itemsToAdd)].feePerVsize);
+      arr.push(transactions[Math.floor(transactions.length * chunk * itemsToAdd)].effectiveFeePerVsize);
       itemsToAdd--;
     }
 
-    arr.push(transactions[0].feePerVsize);
+    arr.push(transactions[0].effectiveFeePerVsize);
     return arr;
   }
 
@@ -52,16 +72,116 @@ export class Common {
     return {
       txid: tx.txid,
       fee: tx.fee,
-      weight: tx.weight,
+      vsize: tx.weight / 4,
       value: tx.vout.reduce((acc, vout) => acc + (vout.value ? vout.value : 0), 0),
     };
   }
 
-  static sleep(ms: number): Promise<void> {
+  static sleep$(ms: number): Promise<void> {
     return new Promise((resolve) => {
        setTimeout(() => {
          resolve();
        }, ms);
     });
   }
+
+  static shuffleArray(array: any[]) {
+    for (let i = array.length - 1; i > 0; i--) {
+        const j = Math.floor(Math.random() * (i + 1));
+        [array[i], array[j]] = [array[j], array[i]];
+    }
+  }
+
+  static setRelativesAndGetCpfpInfo(tx: TransactionExtended, memPool: { [txid: string]: TransactionExtended }): CpfpInfo {
+    const parents = this.findAllParents(tx, memPool);
+    const lowerFeeParents = parents.filter((parent) => parent.feePerVsize < tx.effectiveFeePerVsize);
+
+    let totalWeight = tx.weight + lowerFeeParents.reduce((prev, val) => prev + val.weight, 0);
+    let totalFees = tx.fee + lowerFeeParents.reduce((prev, val) => prev + val.fee, 0);
+
+    tx.ancestors = parents
+      .map((t) => {
+        return {
+          txid: t.txid,
+          weight: t.weight,
+          fee: t.fee,
+        };
+      });
+
+    // Add high (high fee) decendant weight and fees
+    if (tx.bestDescendant) {
+      totalWeight += tx.bestDescendant.weight;
+      totalFees += tx.bestDescendant.fee;
+    }
+
+    tx.effectiveFeePerVsize = Math.max(0, totalFees / (totalWeight / 4));
+    tx.cpfpChecked = true;
+
+    return {
+      ancestors: tx.ancestors,
+      bestDescendant: tx.bestDescendant || null,
+    };
+  }
+
+
+  private static findAllParents(tx: TransactionExtended, memPool: { [txid: string]: TransactionExtended }): TransactionExtended[] {
+    let parents: TransactionExtended[] = [];
+    tx.vin.forEach((parent) => {
+      if (parents.find((p) => p.txid === parent.txid)) {
+        return;
+      }
+
+      const parentTx = memPool[parent.txid];
+      if (parentTx) {
+        if (tx.bestDescendant && tx.bestDescendant.fee / (tx.bestDescendant.weight / 4) > parentTx.feePerVsize) {
+          if (parentTx.bestDescendant && parentTx.bestDescendant.fee < tx.fee + tx.bestDescendant.fee) {
+            parentTx.bestDescendant = {
+              weight: tx.weight + tx.bestDescendant.weight,
+              fee: tx.fee + tx.bestDescendant.fee,
+              txid: tx.txid,
+            };
+          }
+        } else if (tx.feePerVsize > parentTx.feePerVsize) {
+          parentTx.bestDescendant = {
+            weight: tx.weight,
+            fee: tx.fee,
+            txid: tx.txid
+          };
+        }
+        parents.push(parentTx);
+        parents = parents.concat(this.findAllParents(parentTx, memPool));
+      }
+    });
+    return parents;
+  }
+
+  static getSqlInterval(interval: string | null): string | null {
+    switch (interval) {
+      case '24h': return '1 DAY';
+      case '3d': return '3 DAY';
+      case '1w': return '1 WEEK';
+      case '1m': return '1 MONTH';
+      case '3m': return '3 MONTH';
+      case '6m': return '6 MONTH';
+      case '1y': return '1 YEAR';
+      case '2y': return '2 YEAR';
+      case '3y': return '3 YEAR';
+      default: return null;
+    }
+  }
+
+  static indexingEnabled(): boolean {
+    return (
+      ['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK) &&
+      config.DATABASE.ENABLED === true &&
+      config.MEMPOOL.INDEXING_BLOCKS_AMOUNT !== 0
+    );
+  }
+
+  static blocksSummariesIndexingEnabled(): boolean {
+    return (
+      Common.indexingEnabled() &&
+      config.MEMPOOL.BLOCKS_SUMMARIES_INDEXING === true
+    );
+  }
 }

backend/src/api/database-migration.ts

@@ -0,0 +1,761 @@
+import config from '../config';
+import DB from '../database';
+import logger from '../logger';
+import { Common } from './common';
+
+class DatabaseMigration {
+  private static currentVersion = 33;
+  private queryTimeout = 120000;
+  private statisticsAddedIndexed = false;
+  private uniqueLogs: string[] = [];
+
+  private blocksTruncatedMessage = `'blocks' table has been truncated.`;
+  private hashratesTruncatedMessage = `'hashrates' table has been truncated.`;
+
+  /**
+   * Avoid printing multiple time the same message
+   */
+  private uniqueLog(loggerFunction: any, msg: string) {
+    if (this.uniqueLogs.includes(msg)) {
+      return;
+    }
+    this.uniqueLogs.push(msg);
+    loggerFunction(msg);
+  }
+
+  /**
+   * Entry point
+   */
+  public async $initializeOrMigrateDatabase(): Promise<void> {
+    logger.debug('MIGRATIONS: Running migrations');
+
+    await this.$printDatabaseVersion();
+
+    // First of all, if the `state` database does not exist, create it so we can track migration version
+    if (!await this.$checkIfTableExists('state')) {
+      logger.debug('MIGRATIONS: `state` table does not exist. Creating it.');
+      try {
+        await this.$createMigrationStateTable();
+      } catch (e) {
+        logger.err('MIGRATIONS: Unable to create `state` table, aborting in 10 seconds. ' + e);
+        await Common.sleep$(10000);
+        process.exit(-1);
+      }
+      logger.debug('MIGRATIONS: `state` table initialized.');
+    }
+
+    let databaseSchemaVersion = 0;
+    try {
+      databaseSchemaVersion = await this.$getSchemaVersionFromDatabase();
+    } catch (e) {
+      logger.err('MIGRATIONS: Unable to get current database migration version, aborting in 10 seconds. ' + e);
+      await Common.sleep$(10000);
+      process.exit(-1);
+    }
+
+    if (databaseSchemaVersion === 0) {
+      logger.info('Initializing database (first run, clean install)');
+    }
+
+    if (databaseSchemaVersion <= 2) {
+      // Disable some spam logs when they're not relevant
+      this.uniqueLogs.push(this.blocksTruncatedMessage);
+      this.uniqueLogs.push(this.hashratesTruncatedMessage);
+    }
+
+    logger.debug('MIGRATIONS: Current state.schema_version ' + databaseSchemaVersion);
+    logger.debug('MIGRATIONS: Latest DatabaseMigration.version is ' + DatabaseMigration.currentVersion);
+    if (databaseSchemaVersion >= DatabaseMigration.currentVersion) {
+      logger.debug('MIGRATIONS: Nothing to do.');
+      return;
+    }
+
+    // Now, create missing tables. Those queries cannot be wrapped into a transaction unfortunately
+    try {
+      await this.$createMissingTablesAndIndexes(databaseSchemaVersion);
+    } catch (e) {
+      logger.err('MIGRATIONS: Unable to create required tables, aborting in 10 seconds. ' + e);
+      await Common.sleep$(10000);
+      process.exit(-1);
+    }
+
+    if (DatabaseMigration.currentVersion > databaseSchemaVersion) {
+      try {
+        await this.$migrateTableSchemaFromVersion(databaseSchemaVersion);
+        if (databaseSchemaVersion === 0) {
+          logger.notice(`MIGRATIONS: OK. Database schema has been properly initialized to version ${DatabaseMigration.currentVersion} (latest version)`);          
+        } else {
+          logger.notice(`MIGRATIONS: OK. Database schema have been migrated from version ${databaseSchemaVersion} to ${DatabaseMigration.currentVersion} (latest version)`);
+        }
+      } catch (e) {
+        logger.err('MIGRATIONS: Unable to migrate database, aborting. ' + e);
+      }
+    }
+
+    return;
+  }
+
+  /**
+   * Create all missing tables
+   */
+  private async $createMissingTablesAndIndexes(databaseSchemaVersion: number) {
+    await this.$setStatisticsAddedIndexedFlag(databaseSchemaVersion);
+
+    const isBitcoin = ['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK);
+
+    await this.$executeQuery(this.getCreateElementsTableQuery(), await this.$checkIfTableExists('elements_pegs'));
+    await this.$executeQuery(this.getCreateStatisticsQuery(), await this.$checkIfTableExists('statistics'));
+    if (databaseSchemaVersion < 2 && this.statisticsAddedIndexed === false) {
+      await this.$executeQuery(`CREATE INDEX added ON statistics (added);`);
+    }
+    if (databaseSchemaVersion < 3) {
+      await this.$executeQuery(this.getCreatePoolsTableQuery(), await this.$checkIfTableExists('pools'));
+    }
+    if (databaseSchemaVersion < 4) {
+      await this.$executeQuery('DROP table IF EXISTS blocks;');
+      await this.$executeQuery(this.getCreateBlocksTableQuery(), await this.$checkIfTableExists('blocks'));
+    }
+    if (databaseSchemaVersion < 5 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.blocksTruncatedMessage);
+      await this.$executeQuery('TRUNCATE blocks;'); // Need to re-index
+      await this.$executeQuery('ALTER TABLE blocks ADD `reward` double unsigned NOT NULL DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 6 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.blocksTruncatedMessage);
+      await this.$executeQuery('TRUNCATE blocks;');  // Need to re-index
+      // Cleanup original blocks fields type
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `height` integer unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `tx_count` smallint unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `size` integer unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `weight` integer unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `difficulty` double NOT NULL DEFAULT "0"');
+      // We also fix the pools.id type so we need to drop/re-create the foreign key
+      await this.$executeQuery('ALTER TABLE blocks DROP FOREIGN KEY IF EXISTS `blocks_ibfk_1`');
+      await this.$executeQuery('ALTER TABLE pools MODIFY `id` smallint unsigned AUTO_INCREMENT');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `pool_id` smallint unsigned NULL');
+      await this.$executeQuery('ALTER TABLE blocks ADD FOREIGN KEY (`pool_id`) REFERENCES `pools` (`id`)');
+      // Add new block indexing fields
+      await this.$executeQuery('ALTER TABLE blocks ADD `version` integer unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks ADD `bits` integer unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks ADD `nonce` bigint unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks ADD `merkle_root` varchar(65) NOT NULL DEFAULT ""');
+      await this.$executeQuery('ALTER TABLE blocks ADD `previous_block_hash` varchar(65) NULL');
+    }
+
+    if (databaseSchemaVersion < 7 && isBitcoin === true) {
+      await this.$executeQuery('DROP table IF EXISTS hashrates;');
+      await this.$executeQuery(this.getCreateDailyStatsTableQuery(), await this.$checkIfTableExists('hashrates'));
+    }
+
+    if (databaseSchemaVersion < 8 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.blocksTruncatedMessage);
+      await this.$executeQuery('TRUNCATE hashrates;'); // Need to re-index
+      await this.$executeQuery('ALTER TABLE `hashrates` DROP INDEX `PRIMARY`');
+      await this.$executeQuery('ALTER TABLE `hashrates` ADD `id` int NOT NULL AUTO_INCREMENT PRIMARY KEY FIRST');
+      await this.$executeQuery('ALTER TABLE `hashrates` ADD `share` float NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `hashrates` ADD `type` enum("daily", "weekly") DEFAULT "daily"');
+    }
+
+    if (databaseSchemaVersion < 9 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.hashratesTruncatedMessage);
+      await this.$executeQuery('TRUNCATE hashrates;'); // Need to re-index
+      await this.$executeQuery('ALTER TABLE `state` CHANGE `name` `name` varchar(100)');
+      await this.$executeQuery('ALTER TABLE `hashrates` ADD UNIQUE `hashrate_timestamp_pool_id` (`hashrate_timestamp`, `pool_id`)');
+    }
+
+    if (databaseSchemaVersion < 10 && isBitcoin === true) {
+      await this.$executeQuery('ALTER TABLE `blocks` ADD INDEX `blockTimestamp` (`blockTimestamp`)');
+    }
+
+    if (databaseSchemaVersion < 11 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.blocksTruncatedMessage);
+      await this.$executeQuery('TRUNCATE blocks;'); // Need to re-index
+      await this.$executeQuery(`ALTER TABLE blocks
+        ADD avg_fee INT UNSIGNED NULL,
+        ADD avg_fee_rate INT UNSIGNED NULL
+      `);
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `reward` BIGINT UNSIGNED NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `median_fee` INT UNSIGNED NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `fees` INT UNSIGNED NOT NULL DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 12 && isBitcoin === true) {
+      // No need to re-index because the new data type can contain larger values
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `fees` BIGINT UNSIGNED NOT NULL DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 13 && isBitcoin === true) {
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `difficulty` DOUBLE UNSIGNED NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `median_fee` BIGINT UNSIGNED NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `avg_fee` BIGINT UNSIGNED NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE blocks MODIFY `avg_fee_rate` BIGINT UNSIGNED NOT NULL DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 14 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.hashratesTruncatedMessage);
+      await this.$executeQuery('TRUNCATE hashrates;'); // Need to re-index
+      await this.$executeQuery('ALTER TABLE `hashrates` DROP FOREIGN KEY `hashrates_ibfk_1`');
+      await this.$executeQuery('ALTER TABLE `hashrates` MODIFY `pool_id` SMALLINT UNSIGNED NOT NULL DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 16 && isBitcoin === true) {
+      this.uniqueLog(logger.notice, this.hashratesTruncatedMessage);
+      await this.$executeQuery('TRUNCATE hashrates;'); // Need to re-index because we changed timestamps
+    }
+
+    if (databaseSchemaVersion < 17 && isBitcoin === true) {
+      await this.$executeQuery('ALTER TABLE `pools` ADD `slug` CHAR(50) NULL');
+    }
+
+    if (databaseSchemaVersion < 18 && isBitcoin === true) {
+      await this.$executeQuery('ALTER TABLE `blocks` ADD INDEX `hash` (`hash`);');
+    }
+
+    if (databaseSchemaVersion < 19) {
+      await this.$executeQuery(this.getCreateRatesTableQuery(), await this.$checkIfTableExists('rates'));
+    }
+
+    if (databaseSchemaVersion < 20 && isBitcoin === true) {
+      await this.$executeQuery(this.getCreateBlocksSummariesTableQuery(), await this.$checkIfTableExists('blocks_summaries'));
+    }
+
+    if (databaseSchemaVersion < 21) {
+      await this.$executeQuery('DROP TABLE IF EXISTS `rates`');
+      await this.$executeQuery(this.getCreatePricesTableQuery(), await this.$checkIfTableExists('prices'));
+    }
+
+    if (databaseSchemaVersion < 22 && isBitcoin === true) {
+      await this.$executeQuery('DROP TABLE IF EXISTS `difficulty_adjustments`');
+      await this.$executeQuery(this.getCreateDifficultyAdjustmentsTableQuery(), await this.$checkIfTableExists('difficulty_adjustments'));
+    }
+
+    if (databaseSchemaVersion < 23) {
+      await this.$executeQuery('TRUNCATE `prices`');
+      await this.$executeQuery('ALTER TABLE `prices` DROP `avg_prices`');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `USD` float DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `EUR` float DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `GBP` float DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `CAD` float DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `CHF` float DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `AUD` float DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `prices` ADD `JPY` float DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 24 && isBitcoin == true) {
+      await this.$executeQuery('DROP TABLE IF EXISTS `blocks_audits`');
+      await this.$executeQuery(this.getCreateBlocksAuditsTableQuery(), await this.$checkIfTableExists('blocks_audits'));
+    }
+
+    if (databaseSchemaVersion < 25 && isBitcoin === true) {
+      await this.$executeQuery(`INSERT INTO state VALUES('last_node_stats', 0, '1970-01-01');`);
+      await this.$executeQuery(this.getCreateLightningStatisticsQuery(), await this.$checkIfTableExists('lightning_stats'));
+      await this.$executeQuery(this.getCreateNodesQuery(), await this.$checkIfTableExists('nodes'));
+      await this.$executeQuery(this.getCreateChannelsQuery(), await this.$checkIfTableExists('channels'));
+      await this.$executeQuery(this.getCreateNodesStatsQuery(), await this.$checkIfTableExists('node_stats'));
+    }
+
+    if (databaseSchemaVersion < 26 && isBitcoin === true) {
+      if (config.LIGHTNING.ENABLED) {
+        this.uniqueLog(logger.notice, `'lightning_stats' table has been truncated.`);
+      }
+      await this.$executeQuery(`TRUNCATE lightning_stats`);
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD tor_nodes int(11) NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD clearnet_nodes int(11) NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD unannounced_nodes int(11) NOT NULL DEFAULT "0"');
+    }
+
+    if (databaseSchemaVersion < 27 && isBitcoin === true) {
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD avg_capacity bigint(20) unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD avg_fee_rate int(11) unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD avg_base_fee_mtokens bigint(20) unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD med_capacity bigint(20) unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD med_fee_rate int(11) unsigned NOT NULL DEFAULT "0"');
+      await this.$executeQuery('ALTER TABLE `lightning_stats` ADD med_base_fee_mtokens bigint(20) unsigned NOT NULL DEFAULT "0"');
+    }
+    
+    if (databaseSchemaVersion < 28 && isBitcoin === true) {
+      if (config.LIGHTNING.ENABLED) {
+        this.uniqueLog(logger.notice, `'lightning_stats' and 'node_stats' tables have been truncated.`);
+      }
+      await this.$executeQuery(`TRUNCATE lightning_stats`);
+      await this.$executeQuery(`TRUNCATE node_stats`);
+      await this.$executeQuery(`ALTER TABLE lightning_stats MODIFY added DATE`);
+    }
+
+    if (databaseSchemaVersion < 29 && isBitcoin === true) {
+      await this.$executeQuery(this.getCreateGeoNamesTableQuery(), await this.$checkIfTableExists('geo_names'));
+      await this.$executeQuery('ALTER TABLE `nodes` ADD as_number int(11) unsigned NULL DEFAULT NULL');
+      await this.$executeQuery('ALTER TABLE `nodes` ADD city_id int(11) unsigned NULL DEFAULT NULL');
+      await this.$executeQuery('ALTER TABLE `nodes` ADD country_id int(11) unsigned NULL DEFAULT NULL');
+      await this.$executeQuery('ALTER TABLE `nodes` ADD accuracy_radius int(11) unsigned NULL DEFAULT NULL');
+      await this.$executeQuery('ALTER TABLE `nodes` ADD subdivision_id int(11) unsigned NULL DEFAULT NULL');
+      await this.$executeQuery('ALTER TABLE `nodes` ADD longitude double NULL DEFAULT NULL');
+      await this.$executeQuery('ALTER TABLE `nodes` ADD latitude double NULL DEFAULT NULL');
+    }
+
+    if (databaseSchemaVersion < 30 && isBitcoin === true) {
+      await this.$executeQuery('ALTER TABLE `geo_names` CHANGE `type` `type` enum("city","country","division","continent","as_organization") NOT NULL');
+    }
+
+    if (databaseSchemaVersion < 31 && isBitcoin == true) { // Link blocks to prices
+      await this.$executeQuery('ALTER TABLE `prices` ADD `id` int NULL AUTO_INCREMENT UNIQUE');
+      await this.$executeQuery('DROP TABLE IF EXISTS `blocks_prices`');
+      await this.$executeQuery(this.getCreateBlocksPricesTableQuery(), await this.$checkIfTableExists('blocks_prices'));
+    }
+
+    if (databaseSchemaVersion < 32 && isBitcoin == true) {
+      await this.$executeQuery('ALTER TABLE `blocks_summaries` ADD `template` JSON DEFAULT "[]"');
+    }
+
+    if (databaseSchemaVersion < 33 && isBitcoin == true) {
+      await this.$executeQuery('ALTER TABLE `geo_names` CHANGE `type` `type` enum("city","country","division","continent","as_organization", "country_iso_code") NOT NULL');
+    }
+  }
+
+  /**
+   * Special case here for the `statistics` table - It appeared that somehow some dbs already had the `added` field indexed
+   * while it does not appear in previous schemas. The mariadb command "CREATE INDEX IF NOT EXISTS" is not supported on
+   * older mariadb version. Therefore we set a flag here in order to know if the index needs to be created or not before
+   * running the migration process
+   */
+  private async $setStatisticsAddedIndexedFlag(databaseSchemaVersion: number) {
+    if (databaseSchemaVersion >= 2) {
+      this.statisticsAddedIndexed = true;
+      return;
+    }
+
+    try {
+      // We don't use "CREATE INDEX IF NOT EXISTS" because it is not supported on old mariadb version 5.X
+      const query = `SELECT COUNT(1) hasIndex FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_schema=DATABASE() AND table_name='statistics' AND index_name='added';`;
+      const [rows] = await this.$executeQuery(query, true);
+      if (rows[0].hasIndex === 0) {
+        logger.debug('MIGRATIONS: `statistics.added` is not indexed');
+        this.statisticsAddedIndexed = false;
+      } else if (rows[0].hasIndex === 1) {
+        logger.debug('MIGRATIONS: `statistics.added` is already indexed');
+        this.statisticsAddedIndexed = true;
+      }
+    } catch (e) {
+      // Should really never happen but just in case it fails, we just don't execute
+      // any query related to this indexing so it won't fail if the index actually already exists
+      logger.err('MIGRATIONS: Unable to check if `statistics.added` INDEX exist or not.');
+      this.statisticsAddedIndexed = true;
+    }
+  }
+
+  /**
+   * Small query execution wrapper to log all executed queries
+   */
+  private async $executeQuery(query: string, silent = false): Promise<any> {
+    if (!silent) {
+      logger.debug('MIGRATIONS: Execute query:\n' + query);
+    }
+    return DB.query({ sql: query, timeout: this.queryTimeout });
+  }
+
+  /**
+   * Check if 'table' exists in the database
+   */
+  private async $checkIfTableExists(table: string): Promise<boolean> {
+    const query = `SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = '${config.DATABASE.DATABASE}' AND TABLE_NAME = '${table}'`;
+    const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+    return rows[0]['COUNT(*)'] === 1;
+  }
+
+  /**
+   * Get current database version
+   */
+  private async $getSchemaVersionFromDatabase(): Promise<number> {
+    const query = `SELECT number FROM state WHERE name = 'schema_version';`;
+    const [rows] = await this.$executeQuery(query, true);
+    return rows[0]['number'];
+  }
+
+  /**
+   * Create the `state` table
+   */
+  private async $createMigrationStateTable(): Promise<void> {
+    const query = `CREATE TABLE IF NOT EXISTS state (
+      name varchar(25) NOT NULL,
+      number int(11) NULL,
+      string varchar(100) NULL,
+      CONSTRAINT name_unique UNIQUE (name)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+    await this.$executeQuery(query);
+
+    // Set initial values
+    await this.$executeQuery(`INSERT INTO state VALUES('schema_version', 0, NULL);`);
+    await this.$executeQuery(`INSERT INTO state VALUES('last_elements_block', 0, NULL);`);
+  }
+
+  /**
+   * We actually execute the migrations queries here
+   */
+  private async $migrateTableSchemaFromVersion(version: number): Promise<void> {
+    const transactionQueries: string[] = [];
+    for (const query of this.getMigrationQueriesFromVersion(version)) {
+      transactionQueries.push(query);
+    }
+
+    logger.notice(`MIGRATIONS: ${version > 0 ? 'Upgrading' : 'Initializing'} database schema version number to ${DatabaseMigration.currentVersion}`);
+    transactionQueries.push(this.getUpdateToLatestSchemaVersionQuery());
+
+    try {
+      await this.$executeQuery('START TRANSACTION;');
+      for (const query of transactionQueries) {
+        await this.$executeQuery(query);
+      }
+      await this.$executeQuery('COMMIT;');
+    } catch (e) {
+      await this.$executeQuery('ROLLBACK;');
+      throw e;
+    }
+  }
+
+  /**
+   * Generate migration queries based on schema version
+   */
+  private getMigrationQueriesFromVersion(version: number): string[] {
+    const queries: string[] = [];
+    const isBitcoin = ['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK);
+
+    if (version < 1) {
+      if (config.MEMPOOL.NETWORK !== 'liquid' && config.MEMPOOL.NETWORK !== 'liquidtestnet') {
+        if (version > 0) {
+          logger.notice(`MIGRATIONS: Migrating (shifting) statistics table data`);
+        }
+        queries.push(this.getShiftStatisticsQuery());
+      }
+    }
+
+    if (version < 7 && isBitcoin === true) {
+      queries.push(`INSERT INTO state(name, number, string) VALUES ('last_hashrates_indexing', 0, NULL)`);
+    }
+
+    if (version < 9  && isBitcoin === true) {
+      queries.push(`INSERT INTO state(name, number, string) VALUES ('last_weekly_hashrates_indexing', 0, NULL)`);
+    }
+
+    return queries;
+  }
+
+  /**
+   * Save the schema version in the database
+   */
+  private getUpdateToLatestSchemaVersionQuery(): string {
+    return `UPDATE state SET number = ${DatabaseMigration.currentVersion} WHERE name = 'schema_version';`;
+  }
+
+  /**
+   * Print current database version
+   */
+  private async $printDatabaseVersion() {
+    try {
+      const [rows] = await this.$executeQuery('SELECT VERSION() as version;', true);
+      logger.debug(`MIGRATIONS: Database engine version '${rows[0].version}'`);
+    } catch (e) {
+      logger.debug(`MIGRATIONS: Could not fetch database engine version. ` + e);
+    }
+  }
+
+  // Couple of wrappers to clean the main logic
+  private getShiftStatisticsQuery(): string {
+    return `UPDATE statistics SET
+      vsize_1 = vsize_1 + vsize_2, vsize_2 = vsize_3,
+      vsize_3 = vsize_4, vsize_4 = vsize_5,
+      vsize_5 = vsize_6, vsize_6 = vsize_8,
+      vsize_8 = vsize_10, vsize_10 = vsize_12,
+      vsize_12 = vsize_15, vsize_15 = vsize_20,
+      vsize_20 = vsize_30, vsize_30 = vsize_40,
+      vsize_40 = vsize_50, vsize_50 = vsize_60,
+      vsize_60 = vsize_70, vsize_70 = vsize_80,
+      vsize_80 = vsize_90, vsize_90 = vsize_100,
+      vsize_100 = vsize_125, vsize_125 = vsize_150,
+      vsize_150 = vsize_175, vsize_175 = vsize_200,
+      vsize_200 = vsize_250, vsize_250 = vsize_300,
+      vsize_300 = vsize_350, vsize_350 = vsize_400,
+      vsize_400 = vsize_500, vsize_500 = vsize_600,
+      vsize_600 = vsize_700, vsize_700 = vsize_800,
+      vsize_800 = vsize_900, vsize_900 = vsize_1000,
+      vsize_1000 = vsize_1200, vsize_1200 = vsize_1400,
+      vsize_1400 = vsize_1800, vsize_1800 = vsize_2000, vsize_2000 = 0;`;
+  }
+
+  private getCreateStatisticsQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS statistics (
+      id int(11) NOT NULL AUTO_INCREMENT,
+      added datetime NOT NULL,
+      unconfirmed_transactions int(11) UNSIGNED NOT NULL,
+      tx_per_second float UNSIGNED NOT NULL,
+      vbytes_per_second int(10) UNSIGNED NOT NULL,
+      mempool_byte_weight int(10) UNSIGNED NOT NULL,
+      fee_data longtext NOT NULL,
+      total_fee double UNSIGNED NOT NULL,
+      vsize_1 int(11) NOT NULL,
+      vsize_2 int(11) NOT NULL,
+      vsize_3 int(11) NOT NULL,
+      vsize_4 int(11) NOT NULL,
+      vsize_5 int(11) NOT NULL,
+      vsize_6 int(11) NOT NULL,
+      vsize_8 int(11) NOT NULL,
+      vsize_10 int(11) NOT NULL,
+      vsize_12 int(11) NOT NULL,
+      vsize_15 int(11) NOT NULL,
+      vsize_20 int(11) NOT NULL,
+      vsize_30 int(11) NOT NULL,
+      vsize_40 int(11) NOT NULL,
+      vsize_50 int(11) NOT NULL,
+      vsize_60 int(11) NOT NULL,
+      vsize_70 int(11) NOT NULL,
+      vsize_80 int(11) NOT NULL,
+      vsize_90 int(11) NOT NULL,
+      vsize_100 int(11) NOT NULL,
+      vsize_125 int(11) NOT NULL,
+      vsize_150 int(11) NOT NULL,
+      vsize_175 int(11) NOT NULL,
+      vsize_200 int(11) NOT NULL,
+      vsize_250 int(11) NOT NULL,
+      vsize_300 int(11) NOT NULL,
+      vsize_350 int(11) NOT NULL,
+      vsize_400 int(11) NOT NULL,
+      vsize_500 int(11) NOT NULL,
+      vsize_600 int(11) NOT NULL,
+      vsize_700 int(11) NOT NULL,
+      vsize_800 int(11) NOT NULL,
+      vsize_900 int(11) NOT NULL,
+      vsize_1000 int(11) NOT NULL,
+      vsize_1200 int(11) NOT NULL,
+      vsize_1400 int(11) NOT NULL,
+      vsize_1600 int(11) NOT NULL,
+      vsize_1800 int(11) NOT NULL,
+      vsize_2000 int(11) NOT NULL,
+      CONSTRAINT PRIMARY KEY (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateElementsTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS elements_pegs (
+      block int(11) NOT NULL,
+      datetime int(11) NOT NULL,
+      amount bigint(20) NOT NULL,
+      txid varchar(65) NOT NULL,
+      txindex int(11) NOT NULL,
+      bitcoinaddress varchar(100) NOT NULL,
+      bitcointxid varchar(65) NOT NULL,
+      bitcoinindex int(11) NOT NULL,
+      final_tx int(11) NOT NULL
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreatePoolsTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS pools (
+      id int(11) NOT NULL AUTO_INCREMENT,
+      name varchar(50) NOT NULL,
+      link varchar(255) NOT NULL,
+      addresses text NOT NULL,
+      regexes text NOT NULL,
+      PRIMARY KEY (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;`;
+  }
+
+  private getCreateBlocksTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS blocks (
+      height int(11) unsigned NOT NULL,
+      hash varchar(65) NOT NULL,
+      blockTimestamp timestamp NOT NULL,
+      size int(11) unsigned NOT NULL,
+      weight int(11) unsigned NOT NULL,
+      tx_count int(11) unsigned NOT NULL,
+      coinbase_raw text,
+      difficulty bigint(20) unsigned NOT NULL,
+      pool_id int(11) DEFAULT -1,
+      fees double unsigned NOT NULL,
+      fee_span json NOT NULL,
+      median_fee double unsigned NOT NULL,
+      PRIMARY KEY (height),
+      INDEX (pool_id),
+      FOREIGN KEY (pool_id) REFERENCES pools (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateDailyStatsTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS hashrates (
+      hashrate_timestamp timestamp NOT NULL,
+      avg_hashrate double unsigned DEFAULT '0',
+      pool_id smallint unsigned NULL,
+      PRIMARY KEY (hashrate_timestamp),
+      INDEX (pool_id),
+      FOREIGN KEY (pool_id) REFERENCES pools (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateRatesTableQuery(): string { // This table has been replaced by the prices table
+    return `CREATE TABLE IF NOT EXISTS rates (
+      height int(10) unsigned NOT NULL,
+      bisq_rates JSON NOT NULL,
+      PRIMARY KEY (height)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateBlocksSummariesTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS blocks_summaries (
+      height int(10) unsigned NOT NULL,
+      id varchar(65) NOT NULL,
+      transactions JSON NOT NULL,
+      PRIMARY KEY (id),
+      INDEX (height)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreatePricesTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS prices (
+      time timestamp NOT NULL,
+      avg_prices JSON NOT NULL,
+      PRIMARY KEY (time)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateDifficultyAdjustmentsTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS difficulty_adjustments (
+      time timestamp NOT NULL,
+      height int(10) unsigned NOT NULL,
+      difficulty double unsigned NOT NULL,
+      adjustment float NOT NULL,
+      PRIMARY KEY (height),
+      INDEX (time)
+      ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateLightningStatisticsQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS lightning_stats (
+      id int(11) NOT NULL AUTO_INCREMENT,
+      added datetime NOT NULL,
+      channel_count int(11) NOT NULL,
+      node_count int(11) NOT NULL,
+      total_capacity double unsigned NOT NULL,
+      PRIMARY KEY (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateNodesQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS nodes (
+      public_key varchar(66) NOT NULL,
+      first_seen datetime NOT NULL,
+      updated_at datetime NOT NULL,
+      alias varchar(200) CHARACTER SET utf8mb4 NOT NULL,
+      color varchar(200) NOT NULL,
+      sockets text DEFAULT NULL,
+      PRIMARY KEY (public_key),
+      KEY alias (alias(10))
+      ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateChannelsQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS channels (
+      id bigint(11) unsigned NOT NULL,
+      short_id varchar(15) NOT NULL DEFAULT '',
+      capacity bigint(20) unsigned NOT NULL,
+      transaction_id varchar(64) NOT NULL,
+      transaction_vout int(11) NOT NULL,
+      updated_at datetime DEFAULT NULL,
+      created datetime DEFAULT NULL,
+      status int(11) NOT NULL DEFAULT 0,
+      closing_transaction_id varchar(64) DEFAULT NULL,
+      closing_date datetime DEFAULT NULL,
+      closing_reason int(11) DEFAULT NULL,
+      node1_public_key varchar(66) NOT NULL,
+      node1_base_fee_mtokens bigint(20) unsigned DEFAULT NULL,
+      node1_cltv_delta int(11) DEFAULT NULL,
+      node1_fee_rate bigint(11) DEFAULT NULL,
+      node1_is_disabled tinyint(1) DEFAULT NULL,
+      node1_max_htlc_mtokens bigint(20) unsigned DEFAULT NULL,
+      node1_min_htlc_mtokens bigint(20) DEFAULT NULL,
+      node1_updated_at datetime DEFAULT NULL,
+      node2_public_key varchar(66) NOT NULL,
+      node2_base_fee_mtokens bigint(20) unsigned DEFAULT NULL,
+      node2_cltv_delta int(11) DEFAULT NULL,
+      node2_fee_rate bigint(11) DEFAULT NULL,
+      node2_is_disabled tinyint(1) DEFAULT NULL,
+      node2_max_htlc_mtokens bigint(20) unsigned DEFAULT NULL,
+      node2_min_htlc_mtokens bigint(20) unsigned DEFAULT NULL,
+      node2_updated_at datetime DEFAULT NULL,
+      PRIMARY KEY (id),
+      KEY node1_public_key (node1_public_key),
+      KEY node2_public_key (node2_public_key),
+      KEY status (status),
+      KEY short_id (short_id),
+      KEY transaction_id (transaction_id),
+      KEY closing_transaction_id (closing_transaction_id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateNodesStatsQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS node_stats (
+      id int(11) unsigned NOT NULL AUTO_INCREMENT,
+      public_key varchar(66) NOT NULL DEFAULT '',
+      added date NOT NULL,
+      capacity bigint(20) unsigned NOT NULL DEFAULT 0,
+      channels int(11) unsigned NOT NULL DEFAULT 0,
+      PRIMARY KEY (id),
+      UNIQUE KEY added (added,public_key),
+      KEY public_key (public_key)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateBlocksAuditsTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS blocks_audits (
+      time timestamp NOT NULL,
+      hash varchar(65) NOT NULL,
+      height int(10) unsigned NOT NULL,
+      missing_txs JSON NOT NULL,
+      added_txs JSON NOT NULL,
+      match_rate float unsigned NOT NULL,
+      PRIMARY KEY (hash),
+      INDEX (height)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  private getCreateGeoNamesTableQuery(): string {
+    return `CREATE TABLE geo_names (
+      id int(11) unsigned NOT NULL,
+      type enum('city','country','division','continent') NOT NULL,
+      names text DEFAULT NULL,
+      UNIQUE KEY id (id,type),
+      KEY id_2 (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`
+  }
+
+  private getCreateBlocksPricesTableQuery(): string {
+    return `CREATE TABLE IF NOT EXISTS blocks_prices (
+      height int(10) unsigned NOT NULL,
+      price_id int(10) unsigned NOT NULL,
+      PRIMARY KEY (height),
+      INDEX (price_id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;`;
+  }
+
+  public async $truncateIndexedData(tables: string[]) {
+    const allowedTables = ['blocks', 'hashrates', 'prices'];
+
+    try {
+      for (const table of tables) {
+        if (!allowedTables.includes(table)) {
+          logger.debug(`Table ${table} cannot to be re-indexed (not allowed)`);
+          continue;
+        }
+
+        await this.$executeQuery(`TRUNCATE ${table}`, true);
+        if (table === 'hashrates') {
+          await this.$executeQuery('UPDATE state set number = 0 where name = "last_hashrates_indexing"', true);
+        }
+        logger.notice(`Table ${table} has been truncated`);
+      }
+    } catch (e) {
+      logger.warn(`Unable to erase indexed data`);
+    }
+  }
+}
+
+export default new DatabaseMigration();

backend/src/api/difficulty-adjustment.ts

@@ -0,0 +1,67 @@
+import config from '../config';
+import { IDifficultyAdjustment } from '../mempool.interfaces';
+import blocks from './blocks';
+
+class DifficultyAdjustmentApi {
+  constructor() { }
+
+  public getDifficultyAdjustment(): IDifficultyAdjustment {
+    const DATime = blocks.getLastDifficultyAdjustmentTime();
+    const previousRetarget = blocks.getPreviousDifficultyRetarget();
+    const blockHeight = blocks.getCurrentBlockHeight();
+    const blocksCache = blocks.getBlocks();
+    const latestBlock = blocksCache[blocksCache.length - 1];
+
+    const now = new Date().getTime() / 1000;
+    const diff = now - DATime;
+    const blocksInEpoch = blockHeight % 2016;
+    const progressPercent = (blocksInEpoch >= 0) ? blocksInEpoch / 2016 * 100 : 100;
+    const remainingBlocks = 2016 - blocksInEpoch;
+    const nextRetargetHeight = blockHeight + remainingBlocks;
+
+    let difficultyChange = 0;
+    if (remainingBlocks < 1870) {
+      if (blocksInEpoch > 0) {
+        difficultyChange = (600 / (diff / blocksInEpoch) - 1) * 100;
+      }
+      if (difficultyChange > 300) {
+        difficultyChange = 300;
+      }
+      if (difficultyChange < -75) {
+        difficultyChange = -75;
+      }
+    }
+
+    let timeAvgMins = blocksInEpoch && blocksInEpoch > 146 ? diff / blocksInEpoch / 60 : 10;
+
+    // Testnet difficulty is set to 1 after 20 minutes of no blocks,
+    // therefore the time between blocks will always be below 20 minutes (1200s).
+    let timeOffset = 0;
+    if (config.MEMPOOL.NETWORK === 'testnet') {
+      if (timeAvgMins > 20) {
+        timeAvgMins = 20;
+      }
+      if (now - latestBlock.timestamp + timeAvgMins * 60 > 1200) {
+        timeOffset = -Math.min(now - latestBlock.timestamp, 1200) * 1000;
+      }
+    }
+
+    const timeAvg = timeAvgMins * 60 * 1000 ;
+    const remainingTime = (remainingBlocks * timeAvg) + (now * 1000);
+    const estimatedRetargetDate = remainingTime + now;
+
+    return {
+      progressPercent,
+      difficultyChange,
+      estimatedRetargetDate,
+      remainingBlocks,
+      remainingTime,
+      previousRetarget,
+      nextRetargetHeight,
+      timeAvg,
+      timeOffset,
+    };
+  }
+}
+
+export default new DifficultyAdjustmentApi();

backend/src/api/disk-cache.ts

@@ -1,65 +1,70 @@
 import * as fs from 'fs';
 const fsPromises = fs.promises;
-import * as process from 'process';
-import * as cluster from 'cluster';
+import cluster from 'cluster';
 import memPool from './mempool';
 import blocks from './blocks';
 import logger from '../logger';
+import config from '../config';
+import { TransactionExtended } from '../mempool.interfaces';
+import { Common } from './common';
 
 class DiskCache {
-  private static FILE_NAME = './cache.json';
-  private static FILE_NAME_2 = './cache2.json';
-  private static CHUNK_SIZE = 50000;
-  constructor() {
-    if (!cluster.isMaster) {
-      return;
-    }
-    process.on('SIGINT', () => {
-      this.saveCacheToDiskSync();
-      process.exit(2);
-    });
-    process.on('SIGTERM', () => {
-      this.saveCacheToDiskSync();
-      process.exit(2);
-    });
-  }
+  private cacheSchemaVersion = 1;
+
+  private static FILE_NAME = config.MEMPOOL.CACHE_DIR + '/cache.json';
+  private static FILE_NAMES = config.MEMPOOL.CACHE_DIR + '/cache{number}.json';
+  private static CHUNK_FILES = 25;
+  private isWritingCache = false;
+
+  constructor() { }
 
   async $saveCacheToDisk(): Promise<void> {
-    if (!cluster.isMaster) {
+    if (!cluster.isPrimary) {
+      return;
+    }
+    if (this.isWritingCache) {
+      logger.debug('Saving cache already in progress. Skipping.')
       return;
     }
     try {
       logger.debug('Writing mempool and blocks data to disk cache (async)...');
-      const mempoolChunk_1 = Object.fromEntries(Object.entries(memPool.getMempool()).splice(0, DiskCache.CHUNK_SIZE));
-      const mempoolChunk_2 = Object.fromEntries(Object.entries(memPool.getMempool()).splice(DiskCache.CHUNK_SIZE));
+      this.isWritingCache = true;
+
+      const mempool = memPool.getMempool();
+      const mempoolArray: TransactionExtended[] = [];
+      for (const tx in mempool) {
+        mempoolArray.push(mempool[tx]);
+      }
+
+      Common.shuffleArray(mempoolArray);
+
+      const chunkSize = Math.floor(mempoolArray.length / DiskCache.CHUNK_FILES);
+
       await fsPromises.writeFile(DiskCache.FILE_NAME, JSON.stringify({
+        cacheSchemaVersion: this.cacheSchemaVersion,
         blocks: blocks.getBlocks(),
-        mempool: mempoolChunk_1
-      }), {flag: 'w'});
-      await fsPromises.writeFile(DiskCache.FILE_NAME_2, JSON.stringify({
-        mempool: mempoolChunk_2
-      }), {flag: 'w'});
+        blockSummaries: blocks.getBlockSummaries(),
+        mempool: {},
+        mempoolArray: mempoolArray.splice(0, chunkSize),
+      }), { flag: 'w' });
+      for (let i = 1; i < DiskCache.CHUNK_FILES; i++) {
+        await fsPromises.writeFile(DiskCache.FILE_NAMES.replace('{number}', i.toString()), JSON.stringify({
+          mempool: {},
+          mempoolArray: mempoolArray.splice(0, chunkSize),
+        }), { flag: 'w' });
+      }
       logger.debug('Mempool and blocks data saved to disk cache');
+      this.isWritingCache = false;
     } catch (e) {
-      logger.warn('Error writing to cache file: ' + e.message || e);
+      logger.warn('Error writing to cache file: ' + (e instanceof Error ? e.message : e));
+      this.isWritingCache = false;
     }
   }
 
-  saveCacheToDiskSync(): void {
-    try {
-      logger.debug('Writing mempool and blocks data to disk cache...');
-      const mempoolChunk_1 = Object.fromEntries(Object.entries(memPool.getMempool()).splice(0, DiskCache.CHUNK_SIZE));
-      const mempoolChunk_2 = Object.fromEntries(Object.entries(memPool.getMempool()).splice(DiskCache.CHUNK_SIZE));
-      fs.writeFileSync(DiskCache.FILE_NAME, JSON.stringify({
-        blocks: blocks.getBlocks(),
-        mempool: mempoolChunk_1
-      }), {flag: 'w'});
-      fs.writeFileSync(DiskCache.FILE_NAME_2, JSON.stringify({
-        mempool: mempoolChunk_2
-      }), {flag: 'w'});
-      logger.debug('Mempool and blocks data saved to disk cache');
-    } catch (e) {
-      logger.warn('Error writing to cache file: ' + e.message || e);
+  wipeCache() {
+    fs.unlinkSync(DiskCache.FILE_NAME);
+    for (let i = 1; i < DiskCache.CHUNK_FILES; i++) {
+      fs.unlinkSync(DiskCache.FILE_NAMES.replace('{number}', i.toString()));
     }
   }
 
@@ -67,20 +72,48 @@ class DiskCache {
     if (!fs.existsSync(DiskCache.FILE_NAME)) {
       return;
     }
-    let data: any = {};
-    const cacheData = fs.readFileSync(DiskCache.FILE_NAME, 'utf8');
-    if (cacheData) {
-      logger.info('Restoring mempool and blocks data from disk cache');
-      data = JSON.parse(cacheData);
-    }
+    try {
+      let data: any = {};
+      const cacheData = fs.readFileSync(DiskCache.FILE_NAME, 'utf8');
+      if (cacheData) {
+        logger.info('Restoring mempool and blocks data from disk cache');
+        data = JSON.parse(cacheData);
+        if (data.cacheSchemaVersion === undefined || data.cacheSchemaVersion !== this.cacheSchemaVersion) {
+          logger.notice('Disk cache contains an outdated schema version. Clearing it and skipping the cache loading.');
+          return this.wipeCache();
+        }
 
-    if (fs.existsSync(DiskCache.FILE_NAME_2)) {
-      const cacheData2 = JSON.parse(fs.readFileSync(DiskCache.FILE_NAME_2, 'utf8'));
-      Object.assign(data.mempool, cacheData2.mempool);
-    }
+        if (data.mempoolArray) {
+          for (const tx of data.mempoolArray) {
+            data.mempool[tx.txid] = tx;
+          }
+        }
+      }
 
-    memPool.setMempool(data.mempool);
-    blocks.setBlocks(data.blocks);
+      for (let i = 1; i < DiskCache.CHUNK_FILES; i++) {
+        const fileName = DiskCache.FILE_NAMES.replace('{number}', i.toString());
+        try {
+          if (fs.existsSync(fileName)) {
+            const cacheData2 = JSON.parse(fs.readFileSync(fileName, 'utf8'));
+            if (cacheData2.mempoolArray) {
+              for (const tx of cacheData2.mempoolArray) {
+                data.mempool[tx.txid] = tx;
+              }
+            } else {
+              Object.assign(data.mempool, cacheData2.mempool);
+            }
+          }
+        } catch (e) {
+          logger.info('Error parsing ' + fileName + '. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
+        }
+      }
+
+      memPool.setMempool(data.mempool);
+      blocks.setBlocks(data.blocks);
+      blocks.setBlockSummaries(data.blockSummaries || []);
+    } catch (e) {
+      logger.warn('Failed to parse mempoool and blocks cache. Skipping. Reason: ' + (e instanceof Error ? e.message : e));
+    }
   }
 }
 

backend/src/api/donations.ts

@@ -1,201 +0,0 @@
-import config from '../config';
-import axios from 'axios';
-import { DB } from '../database';
-import logger from '../logger';
-
-class Donations {
-  private notifyDonationStatusCallback: ((invoiceId: string) => void) | undefined;
-  private options = {
-    baseURL: config.SPONSORS.BTCPAY_URL,
-    headers: {
-      'Content-Type': 'application/json',
-      'Authorization': config.SPONSORS.BTCPAY_AUTH,
-    },
-  };
-
-  sponsorsCache: any[] = [];
-
-  constructor() {
-    if (!config.SPONSORS.ENABLED) {
-      return;
-    }
-    this.$updateCache();
-  }
-
-  async $updateCache() {
-    try {
-      this.sponsorsCache = await this.$getDonationsFromDatabase('handle, image');
-    } catch (e) {
-      logger.warn('Setting sponsorsCache failed ' + e.message || e);
-    }
-  }
-
-  setNotfyDonationStatusCallback(fn: any): void {
-    this.notifyDonationStatusCallback = fn;
-  }
-
-  async $createRequest(amount: number, orderId: string): Promise<any> {
-    logger.notice('New invoice request. Handle: ' + orderId + ' Amount: ' + amount + ' BTC');
-
-    const postData = {
-      'price': amount,
-      'orderId': orderId,
-      'currency': 'BTC',
-      'itemDesc': 'Sponsor mempool.space',
-      'notificationUrl': config.SPONSORS.BTCPAY_WEBHOOK_URL,
-      'redirectURL': 'https://mempool.space/about',
-    };
-    const response = await axios.post('/invoices', postData, this.options);
-    return {
-      id: response.data.data.id,
-      amount: parseFloat(response.data.data.btcPrice),
-      addresses: response.data.data.addresses,
-    };
-  }
-
-  async $handleWebhookRequest(data: any): Promise<void> {
-    if (!data || !data.id) {
-      return;
-    }
-    const response = await this.$getStatus(data.id);
-    logger.notice(`Received BTCPayServer webhook. Invoice ID: ${data.id} Status: ${response.status} BTC Paid: ${response.btcPaid}`);
-    if (response.status !== 'complete' && response.status !== 'confirmed' && response.status !== 'paid') {
-      return;
-    }
-
-    if (this.notifyDonationStatusCallback) {
-      this.notifyDonationStatusCallback(data.id);
-    }
-
-    if (parseFloat(response.btcPaid) < 0.01) {
-      return;
-    }
-
-    if (response.orderId !== '') {
-      try {
-        const userData = await this.$getTwitterUserData(response.orderId);
-        const imageUrl = userData.profile_image_url.replace('normal', '200x200');
-        const imageBlob = await this.$downloadProfileImageBlob(imageUrl);
-
-        logger.debug('Creating database entry for donation with invoice id: ' + response.id);
-        await this.$addDonationToDatabase(response.btcPaid, userData.screen_name, userData.id, response.id, imageUrl, imageBlob);
-        this.$updateCache();
-      } catch (e) {
-        logger.err(`Error fetching twitter data for handle ${response.orderId}: ${e.message}`);
-      }
-    }
-  }
-
-  getSponsorImage(id: string): any | undefined {
-    const sponsor = this.sponsorsCache.find((s) => s.handle === id);
-    if (sponsor) {
-      return sponsor.image;
-    }
-  }
-
-  async $getDonationsFromDatabase(fields: string): Promise<any[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `SELECT ${fields} FROM donations ORDER BY id DESC`;
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return rows;
-    } catch (e) {
-      logger.err('$getDonationsFromDatabase() error: ' + e.message || e);
-      return [];
-    }
-  }
-
-  private async $getOldDonations(): Promise<any[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `SELECT * FROM donations WHERE twitter_id IS NULL AND handle != ''`;
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return rows;
-    } catch (e) {
-      logger.err('$getLegacyDonations() error' + e.message || e);
-      return [];
-    }
-  }
-
-  private async $getStatus(id: string): Promise<any> {
-    logger.debug('Fetching status for invoice: ' + id);
-    const response = await axios.get('/invoices/' + id, this.options);
-    logger.debug('Invoice status received: ' + JSON.stringify(response.data));
-    return response.data.data;
-  }
-
-  private async $addDonationToDatabase(btcPaid: number, handle: string, twitter_id: number | null,
-    orderId: string, imageUrl: string, image: string): Promise<void> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `INSERT IGNORE INTO donations(added, amount, handle, twitter_id, order_id, imageUrl, image) VALUES (NOW(), ?, ?, ?, ?, ?, FROM_BASE64(?))`;
-      const params: (string | number | null)[] = [
-        btcPaid,
-        handle,
-        twitter_id,
-        orderId,
-        imageUrl,
-        image,
-      ];
-      const [result]: any = await connection.query(query, params);
-      connection.release();
-    } catch (e) {
-      logger.err('$addDonationToDatabase() error' + e.message || e);
-    }
-  }
-
-  private async $updateDonation(id: number, handle: string, twitterId: number, imageUrl: string, image: string): Promise<void> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `UPDATE donations SET handle = ?, twitter_id = ?, imageUrl = ?, image = FROM_BASE64(?) WHERE id = ?`;
-      const params: (string | number)[] = [
-        handle,
-        twitterId,
-        imageUrl,
-        image,
-        id,
-      ];
-      const [result]: any = await connection.query(query, params);
-      connection.release();
-    } catch (e) {
-      logger.err('$updateDonation() error' + e.message || e);
-    }
-  }
-
-  private async $getTwitterUserData(handle: string): Promise<any> {
-    logger.debug('Fetching Twitter API data...');
-    const res = await axios.get(`https://api.twitter.com/1.1/users/show.json?screen_name=${handle}`, {
-      headers: {
-        Authorization: 'Bearer ' + config.SPONSORS.TWITTER_BEARER_AUTH
-      }
-    });
-    logger.debug('Twitter user data fetched:' + JSON.stringify(res.data));
-    return res.data;
-  }
-
-  private async $downloadProfileImageBlob(url: string): Promise<string> {
-    logger.debug('Fetching image blob...');
-    const res = await axios.get(url, { responseType: 'arraybuffer' });
-    logger.debug('Image downloaded.');
-    return Buffer.from(res.data, 'utf8').toString('base64');
-  }
-
-  private async refreshSponsors(): Promise<void> {
-    const oldDonations = await this.$getOldDonations();
-    oldDonations.forEach(async (donation: any) => {
-      logger.debug('Migrating donation for handle: ' + donation.handle);
-      try {
-        const twitterData = await this.$getTwitterUserData(donation.handle);
-        const imageUrl = twitterData.profile_image_url.replace('normal', '200x200');
-        const imageBlob = await this.$downloadProfileImageBlob(imageUrl);
-        await this.$updateDonation(donation.id, twitterData.screen_name, twitterData.id, imageUrl, imageBlob);
-      } catch (e) {
-        logger.err('Failed to migrate donation for handle: ' + donation.handle + '. ' + (e.message || e));
-      }
-    });
-  }
-}
-
-export default new Donations();

backend/src/api/explorer/channels.api.ts

@@ -0,0 +1,259 @@
+import logger from '../../logger';
+import DB from '../../database';
+
+class ChannelsApi {
+  public async $getAllChannels(): Promise<any[]> {
+    try {
+      const query = `SELECT * FROM channels`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getAllChannels error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getAllChannelsGeo(publicKey?: string): Promise<any[]> {
+    try {
+      const params: string[] = [];
+      let query = `SELECT nodes_1.public_key as node1_public_key, nodes_1.alias AS node1_alias,
+        nodes_1.latitude AS node1_latitude, nodes_1.longitude AS node1_longitude,
+        nodes_2.public_key as node2_public_key, nodes_2.alias AS node2_alias,
+        nodes_2.latitude AS node2_latitude, nodes_2.longitude AS node2_longitude,
+        channels.capacity
+      FROM channels
+      JOIN nodes AS nodes_1 on nodes_1.public_key = channels.node1_public_key
+      JOIN nodes AS nodes_2 on nodes_2.public_key = channels.node2_public_key
+      WHERE nodes_1.latitude IS NOT NULL AND nodes_1.longitude IS NOT NULL
+        AND nodes_2.latitude IS NOT NULL AND nodes_2.longitude IS NOT NULL
+      `;
+
+      if (publicKey !== undefined) {
+        query += ' AND (nodes_1.public_key = ? OR nodes_2.public_key = ?)';
+        params.push(publicKey);
+        params.push(publicKey);
+      }
+
+      const [rows]: any = await DB.query(query, params);
+      return rows.map((row) => [
+        row.node1_public_key, row.node1_alias, row.node1_longitude, row.node1_latitude,
+        row.node2_public_key, row.node2_alias, row.node2_longitude, row.node2_latitude,
+        row.capacity]);
+    } catch (e) {
+      logger.err('$getAllChannelsGeo error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $searchChannelsById(search: string): Promise<any[]> {
+    try {
+      const searchStripped = search.replace('%', '') + '%';
+      const query = `SELECT id, short_id, capacity FROM channels WHERE id LIKE ? OR short_id LIKE ? LIMIT 10`;
+      const [rows]: any = await DB.query(query, [searchStripped, searchStripped]);
+      return rows;
+    } catch (e) {
+      logger.err('$searchChannelsById error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getChannelsByStatus(status: number): Promise<any[]> {
+    try {
+      const query = `SELECT * FROM channels WHERE status = ?`;
+      const [rows]: any = await DB.query(query, [status]);
+      return rows;
+    } catch (e) {
+      logger.err('$getChannelsByStatus error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getClosedChannelsWithoutReason(): Promise<any[]> {
+    try {
+      const query = `SELECT * FROM channels WHERE status = 2 AND closing_reason IS NULL AND closing_transaction_id != ''`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getClosedChannelsWithoutReason error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getChannelsWithoutCreatedDate(): Promise<any[]> {
+    try {
+      const query = `SELECT * FROM channels WHERE created IS NULL`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getChannelsWithoutCreatedDate error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getChannel(id: string): Promise<any> {
+    try {
+      const query = `SELECT n1.alias AS alias_left, n2.alias AS alias_right, channels.*, ns1.channels AS channels_left, ns1.capacity AS capacity_left, ns2.channels AS channels_right, ns2.capacity AS capacity_right FROM channels LEFT JOIN nodes AS n1 ON n1.public_key = channels.node1_public_key LEFT JOIN nodes AS n2 ON n2.public_key = channels.node2_public_key LEFT JOIN node_stats AS ns1 ON ns1.public_key = channels.node1_public_key LEFT JOIN node_stats AS ns2 ON ns2.public_key = channels.node2_public_key WHERE (ns1.id = (SELECT MAX(id) FROM node_stats WHERE public_key = channels.node1_public_key) AND ns2.id = (SELECT MAX(id) FROM node_stats WHERE public_key = channels.node2_public_key)) AND channels.id = ?`;
+      const [rows]: any = await DB.query(query, [id]);
+      if (rows[0]) {
+        return this.convertChannel(rows[0]);
+      }
+    } catch (e) {
+      logger.err('$getChannel error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getChannelsStats(): Promise<any> {
+    try {
+      // Feedback from zerofeerouting:
+      // "I would argue > 5000ppm can be ignored. Channels charging more than .5% fee are ignored by CLN for example."
+      const ignoredFeeRateThreshold = 5000;
+      const ignoredBaseFeeThreshold = 5000;
+
+      // Capacity
+      let query = `SELECT AVG(capacity) AS avgCapacity FROM channels WHERE status = 1 ORDER BY capacity`;
+      const [avgCapacity]: any = await DB.query(query);
+
+      query = `SELECT capacity FROM channels WHERE status = 1 ORDER BY capacity`;
+      let [capacity]: any = await DB.query(query);
+      capacity = capacity.map(capacity => capacity.capacity);
+      const medianCapacity = capacity[Math.floor(capacity.length / 2)];
+
+      // Fee rates
+      query = `SELECT node1_fee_rate FROM channels WHERE node1_fee_rate < ${ignoredFeeRateThreshold} AND status = 1`;
+      let [feeRates1]: any = await DB.query(query);
+      feeRates1 = feeRates1.map(rate => rate.node1_fee_rate);
+      query = `SELECT node2_fee_rate FROM channels WHERE node2_fee_rate < ${ignoredFeeRateThreshold} AND status = 1`;
+      let [feeRates2]: any = await DB.query(query);
+      feeRates2 = feeRates2.map(rate => rate.node2_fee_rate);
+
+      let feeRates = (feeRates1.concat(feeRates2)).sort((a, b) => a - b);
+      let avgFeeRate = 0;
+      for (const rate of feeRates) {
+        avgFeeRate += rate; 
+      }
+      avgFeeRate /= feeRates.length;
+      const medianFeeRate = feeRates[Math.floor(feeRates.length / 2)];
+
+      // Base fees
+      query = `SELECT node1_base_fee_mtokens FROM channels WHERE node1_base_fee_mtokens < ${ignoredBaseFeeThreshold} AND status = 1`;
+      let [baseFees1]: any = await DB.query(query);
+      baseFees1 = baseFees1.map(rate => rate.node1_base_fee_mtokens);
+      query = `SELECT node2_base_fee_mtokens FROM channels WHERE node2_base_fee_mtokens < ${ignoredBaseFeeThreshold} AND status = 1`;
+      let [baseFees2]: any = await DB.query(query);
+      baseFees2 = baseFees2.map(rate => rate.node2_base_fee_mtokens);
+
+      let baseFees = (baseFees1.concat(baseFees2)).sort((a, b) => a - b);
+      let avgBaseFee = 0;
+      for (const fee of baseFees) {
+        avgBaseFee += fee; 
+      }
+      avgBaseFee /= baseFees.length;
+      const medianBaseFee = feeRates[Math.floor(baseFees.length / 2)];
+      
+      return {
+        avgCapacity: parseInt(avgCapacity[0].avgCapacity, 10),
+        avgFeeRate: avgFeeRate,
+        avgBaseFee: avgBaseFee,
+        medianCapacity: medianCapacity,
+        medianFeeRate: medianFeeRate,
+        medianBaseFee: medianBaseFee,
+      }
+
+    } catch (e) {
+      logger.err(`Cannot calculate channels statistics. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
+  public async $getChannelsByTransactionId(transactionIds: string[]): Promise<any[]> {
+    try {
+      transactionIds = transactionIds.map((id) => '\'' + id + '\'');
+      const query = `SELECT n1.alias AS alias_left, n2.alias AS alias_right, channels.* FROM channels LEFT JOIN nodes AS n1 ON n1.public_key = channels.node1_public_key LEFT JOIN nodes AS n2 ON n2.public_key = channels.node2_public_key WHERE channels.transaction_id IN (${transactionIds.join(', ')}) OR channels.closing_transaction_id IN (${transactionIds.join(', ')})`;
+      const [rows]: any = await DB.query(query);
+      const channels = rows.map((row) => this.convertChannel(row));
+      return channels;
+    } catch (e) {
+      logger.err('$getChannelByTransactionId error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getChannelsForNode(public_key: string, index: number, length: number, status: string): Promise<any[]> {
+    try {
+      // Default active and inactive channels
+      let statusQuery = '< 2';
+      // Closed channels only
+      if (status === 'closed') {
+        statusQuery = '= 2';
+      }
+      const query = `SELECT n1.alias AS alias_left, n2.alias AS alias_right, channels.*, ns1.channels AS channels_left, ns1.capacity AS capacity_left, ns2.channels AS channels_right, ns2.capacity AS capacity_right FROM channels LEFT JOIN nodes AS n1 ON n1.public_key = channels.node1_public_key LEFT JOIN nodes AS n2 ON n2.public_key = channels.node2_public_key LEFT JOIN node_stats AS ns1 ON ns1.public_key = channels.node1_public_key LEFT JOIN node_stats AS ns2 ON ns2.public_key = channels.node2_public_key WHERE (ns1.id = (SELECT MAX(id) FROM node_stats WHERE public_key = channels.node1_public_key) AND ns2.id = (SELECT MAX(id) FROM node_stats WHERE public_key = channels.node2_public_key)) AND (node1_public_key = ? OR node2_public_key = ?) AND status ${statusQuery} ORDER BY channels.capacity DESC LIMIT ?, ?`;
+      const [rows]: any = await DB.query(query, [public_key, public_key, index, length]);
+      const channels = rows.map((row) => this.convertChannel(row));
+      return channels;
+    } catch (e) {
+      logger.err('$getChannelsForNode error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getChannelsCountForNode(public_key: string, status: string): Promise<any> {
+    try {
+      // Default active and inactive channels
+      let statusQuery = '< 2';
+      // Closed channels only
+      if (status === 'closed') {
+        statusQuery = '= 2';
+      }
+      const query = `SELECT COUNT(*) AS count FROM channels WHERE (node1_public_key = ? OR node2_public_key = ?) AND status ${statusQuery}`;
+      const [rows]: any = await DB.query(query, [public_key, public_key]);
+      return rows[0]['count'];
+    } catch (e) {
+      logger.err('$getChannelsForNode error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  private convertChannel(channel: any): any {
+    return {
+      'id': channel.id,
+      'short_id': channel.short_id,
+      'capacity': channel.capacity,
+      'transaction_id': channel.transaction_id,
+      'transaction_vout': channel.transaction_vout,
+      'closing_transaction_id': channel.closing_transaction_id,
+      'closing_reason': channel.closing_reason,
+      'updated_at': channel.updated_at,
+      'created': channel.created,
+      'status': channel.status,
+      'node_left': {
+        'alias': channel.alias_left,
+        'public_key': channel.node1_public_key,
+        'channels': channel.channels_left,
+        'capacity': channel.capacity_left,
+        'base_fee_mtokens': channel.node1_base_fee_mtokens,
+        'cltv_delta': channel.node1_cltv_delta,
+        'fee_rate': channel.node1_fee_rate,
+        'is_disabled': channel.node1_is_disabled,
+        'max_htlc_mtokens': channel.node1_max_htlc_mtokens,
+        'min_htlc_mtokens': channel.node1_min_htlc_mtokens,
+        'updated_at': channel.node1_updated_at,
+      },
+      'node_right': {
+        'alias': channel.alias_right,
+        'public_key': channel.node2_public_key,
+        'channels': channel.channels_right,
+        'capacity': channel.capacity_right,
+        'base_fee_mtokens': channel.node2_base_fee_mtokens,
+        'cltv_delta': channel.node2_cltv_delta,
+        'fee_rate': channel.node2_fee_rate,
+        'is_disabled': channel.node2_is_disabled,
+        'max_htlc_mtokens': channel.node2_max_htlc_mtokens,
+        'min_htlc_mtokens': channel.node2_min_htlc_mtokens,
+        'updated_at': channel.node2_updated_at,
+      },
+    };
+  }
+}
+
+export default new ChannelsApi();

backend/src/api/explorer/channels.routes.ts

@@ -0,0 +1,109 @@
+import config from '../../config';
+import { Application, Request, Response } from 'express';
+import channelsApi from './channels.api';
+
+class ChannelsRoutes {
+  constructor() { }
+
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/channels/txids', this.$getChannelsByTransactionIds)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/channels/search/:search', this.$searchChannelsById)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/channels/:short_id', this.$getChannel)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/channels', this.$getChannelsForNode)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/channels-geo', this.$getAllChannelsGeo)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/channels-geo/:publicKey', this.$getAllChannelsGeo)
+    ;
+  }
+
+  private async $searchChannelsById(req: Request, res: Response) {
+    try {
+      const channels = await channelsApi.$searchChannelsById(req.params.search);
+      res.json(channels);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getChannel(req: Request, res: Response) {
+    try {
+      const channel = await channelsApi.$getChannel(req.params.short_id);
+      if (!channel) {
+        res.status(404).send('Channel not found');
+        return;
+      }
+      res.json(channel);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getChannelsForNode(req: Request, res: Response) {
+    try {
+      if (typeof req.query.public_key !== 'string') {
+        res.status(400).send('Missing parameter: public_key');
+        return;
+      }
+      const index = parseInt(typeof req.query.index === 'string' ? req.query.index : '0', 10) || 0;
+      const status: string = typeof req.query.status === 'string' ? req.query.status : '';
+      const length = 25;
+      const channels = await channelsApi.$getChannelsForNode(req.query.public_key, index, length, status);
+      const channelsCount = await channelsApi.$getChannelsCountForNode(req.query.public_key, status);
+      res.header('X-Total-Count', channelsCount.toString());
+      res.json(channels);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getChannelsByTransactionIds(req: Request, res: Response) {
+    try {
+      if (!Array.isArray(req.query.txId)) {
+        res.status(400).send('Not an array');
+        return;
+      }
+      const txIds: string[] = [];
+      for (const _txId in req.query.txId) {
+        if (typeof req.query.txId[_txId] === 'string') {
+          txIds.push(req.query.txId[_txId].toString());
+        }
+      }
+      const channels = await channelsApi.$getChannelsByTransactionId(txIds);
+      const inputs: any[] = [];
+      const outputs: any[] = [];
+      for (const txid of txIds) {
+        const foundChannelInputs = channels.find((channel) => channel.closing_transaction_id === txid);
+        if (foundChannelInputs) {
+          inputs.push(foundChannelInputs);
+        } else {
+          inputs.push(null);
+        }
+        const foundChannelOutputs = channels.find((channel) => channel.transaction_id === txid);
+        if (foundChannelOutputs) {
+          outputs.push(foundChannelOutputs);
+        } else {
+          outputs.push(null);
+        }
+      }
+
+      res.json({
+        inputs: inputs,
+        outputs: outputs,
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getAllChannelsGeo(req: Request, res: Response) {
+    try {
+      const channels = await channelsApi.$getAllChannelsGeo(req.params?.publicKey);
+      res.json(channels);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+}
+
+export default new ChannelsRoutes();

backend/src/api/explorer/general.routes.ts

@@ -0,0 +1,58 @@
+import config from '../../config';
+import { Application, Request, Response } from 'express';
+import nodesApi from './nodes.api';
+import channelsApi from './channels.api';
+import statisticsApi from './statistics.api';
+class GeneralLightningRoutes {
+  constructor() { }
+
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/search', this.$searchNodesAndChannels)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/statistics/latest', this.$getGeneralStats)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/statistics/:interval', this.$getStatistics)
+    ;
+  }
+
+  private async $searchNodesAndChannels(req: Request, res: Response) {
+    if (typeof req.query.searchText !== 'string') {
+      res.status(400).send('Missing parameter: searchText');
+      return;
+    }
+    try {
+      const nodes = await nodesApi.$searchNodeByPublicKeyOrAlias(req.query.searchText);
+      const channels = await channelsApi.$searchChannelsById(req.query.searchText);
+      res.json({
+        nodes: nodes,
+        channels: channels,
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getStatistics(req: Request, res: Response) {
+    try {
+      const statistics = await statisticsApi.$getStatistics(req.params.interval);
+      const statisticsCount = await statisticsApi.$getStatisticsCount();
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', statisticsCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(statistics);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getGeneralStats(req: Request, res: Response) {
+    try {
+      const statistics = await statisticsApi.$getLatestStatistics();
+      res.json(statistics);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+}
+
+export default new GeneralLightningRoutes();

backend/src/api/explorer/nodes.api.ts

@@ -0,0 +1,258 @@
+import logger from '../../logger';
+import DB from '../../database';
+
+class NodesApi {
+  public async $getNode(public_key: string): Promise<any> {
+    try {
+      const query = `
+        SELECT nodes.*, geo_names_iso.names as iso_code, geo_names_as.names as as_organization, geo_names_city.names as city,
+        geo_names_country.names as country, geo_names_subdivision.names as subdivision,
+          (SELECT Count(*)
+          FROM channels
+          WHERE channels.status = 2 AND ( channels.node1_public_key = ? OR channels.node2_public_key = ? )) AS channel_closed_count,
+          (SELECT Count(*)
+          FROM channels
+          WHERE channels.status = 1 AND ( channels.node1_public_key = ? OR channels.node2_public_key = ? )) AS channel_active_count,
+          (SELECT Sum(capacity)
+          FROM channels
+          WHERE channels.status = 1 AND ( channels.node1_public_key = ? OR channels.node2_public_key = ? )) AS capacity,
+          (SELECT Avg(capacity)
+          FROM channels
+          WHERE status = 1 AND ( node1_public_key = ? OR node2_public_key = ? )) AS channels_capacity_avg
+        FROM nodes
+        LEFT JOIN geo_names geo_names_as on geo_names_as.id = as_number
+        LEFT JOIN geo_names geo_names_city on geo_names_city.id = city_id
+        LEFT JOIN geo_names geo_names_subdivision on geo_names_subdivision.id = subdivision_id
+        LEFT JOIN geo_names geo_names_country on geo_names_country.id = country_id
+        LEFT JOIN geo_names geo_names_iso ON geo_names_iso.id = nodes.country_id AND geo_names_iso.type = 'country_iso_code'
+        WHERE public_key = ?
+      `;
+      const [rows]: any = await DB.query(query, [public_key, public_key, public_key, public_key, public_key, public_key, public_key, public_key, public_key]);
+      if (rows.length > 0) {
+        rows[0].as_organization = JSON.parse(rows[0].as_organization);
+        rows[0].subdivision = JSON.parse(rows[0].subdivision);
+        rows[0].city = JSON.parse(rows[0].city);
+        rows[0].country = JSON.parse(rows[0].country);
+        return rows[0];
+      }
+      return null;
+    } catch (e) {
+      logger.err('$getNode error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getAllNodes(): Promise<any> {
+    try {
+      const query = `SELECT * FROM nodes`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getAllNodes error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getNodeStats(public_key: string): Promise<any> {
+    try {
+      const query = `SELECT UNIX_TIMESTAMP(added) AS added, capacity, channels FROM node_stats WHERE public_key = ? ORDER BY added DESC`;
+      const [rows]: any = await DB.query(query, [public_key]);
+      return rows;
+    } catch (e) {
+      logger.err('$getNodeStats error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getTopCapacityNodes(): Promise<any> {
+    try {
+      const query = `SELECT nodes.*, node_stats.capacity, node_stats.channels FROM nodes LEFT JOIN node_stats ON node_stats.public_key = nodes.public_key ORDER BY node_stats.added DESC, node_stats.capacity DESC LIMIT 10`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getTopCapacityNodes error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getTopChannelsNodes(): Promise<any> {
+    try {
+      const query = `SELECT nodes.*, node_stats.capacity, node_stats.channels FROM nodes LEFT JOIN node_stats ON node_stats.public_key = nodes.public_key ORDER BY node_stats.added DESC, node_stats.channels DESC LIMIT 10`;
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getTopChannelsNodes error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $searchNodeByPublicKeyOrAlias(search: string) {
+    try {
+      const searchStripped = search.replace('%', '') + '%';
+      const query = `SELECT nodes.public_key, nodes.alias, node_stats.capacity FROM nodes LEFT JOIN node_stats ON node_stats.public_key = nodes.public_key WHERE nodes.public_key LIKE ? OR nodes.alias LIKE ? GROUP BY nodes.public_key ORDER BY node_stats.capacity DESC LIMIT 10`;
+      const [rows]: any = await DB.query(query, [searchStripped, searchStripped]);
+      return rows;
+    } catch (e) {
+      logger.err('$searchNodeByPublicKeyOrAlias error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getNodesISP(groupBy: string, showTor: boolean) {
+    try {
+      const orderBy = groupBy === 'capacity' ? `CAST(SUM(capacity) as INT)` : `COUNT(DISTINCT nodes.public_key)`;
+      
+      // Clearnet
+      let query = `SELECT GROUP_CONCAT(DISTINCT(nodes.as_number)) as ispId, geo_names.names as names,
+          COUNT(DISTINCT nodes.public_key) as nodesCount, CAST(SUM(capacity) as INT) as capacity
+        FROM nodes
+        JOIN geo_names ON geo_names.id = nodes.as_number
+        JOIN channels ON channels.node1_public_key = nodes.public_key OR channels.node2_public_key = nodes.public_key
+        GROUP BY geo_names.names
+        ORDER BY ${orderBy} DESC
+      `;      
+      const [nodesCountPerAS]: any = await DB.query(query);
+
+      let total = 0;
+      const nodesPerAs: any[] = [];
+
+      for (const asGroup of nodesCountPerAS) {
+        if (groupBy === 'capacity') {
+          total += asGroup.capacity;
+        } else {
+          total += asGroup.nodesCount;
+        }
+      }
+
+      // Tor
+      if (showTor) {
+        query = `SELECT COUNT(DISTINCT nodes.public_key) as nodesCount, CAST(SUM(capacity) as INT) as capacity
+          FROM nodes
+          JOIN channels ON channels.node1_public_key = nodes.public_key OR channels.node2_public_key = nodes.public_key
+          ORDER BY ${orderBy} DESC
+        `;      
+        const [nodesCountTor]: any = await DB.query(query);
+
+        total += groupBy === 'capacity' ? nodesCountTor[0].capacity : nodesCountTor[0].nodesCount;
+        nodesPerAs.push({
+          ispId: null,
+          name: 'Tor',
+          count: nodesCountTor[0].nodesCount,
+          share: Math.floor((groupBy === 'capacity' ? nodesCountTor[0].capacity : nodesCountTor[0].nodesCount) / total * 10000) / 100,
+          capacity: nodesCountTor[0].capacity,
+        });
+      }
+
+      for (const as of nodesCountPerAS) {
+        nodesPerAs.push({
+          ispId: as.ispId,
+          name: JSON.parse(as.names),
+          count: as.nodesCount,
+          share: Math.floor((groupBy === 'capacity' ? as.capacity : as.nodesCount) / total * 10000) / 100,
+          capacity: as.capacity,
+        });
+      }
+
+      return nodesPerAs;
+    } catch (e) {
+      logger.err(`Cannot get nodes grouped by AS. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
+  public async $getNodesPerCountry(countryId: string) {
+    try {
+      const query = `
+        SELECT node_stats.public_key, node_stats.capacity, node_stats.channels, nodes.alias,
+          UNIX_TIMESTAMP(nodes.first_seen) as first_seen, UNIX_TIMESTAMP(nodes.updated_at) as updated_at,
+          geo_names_city.names as city
+        FROM node_stats
+        JOIN (
+          SELECT public_key, MAX(added) as last_added
+          FROM node_stats
+          GROUP BY public_key
+        ) as b ON b.public_key = node_stats.public_key AND b.last_added = node_stats.added
+        JOIN nodes ON nodes.public_key = node_stats.public_key
+        JOIN geo_names geo_names_country ON geo_names_country.id = nodes.country_id AND geo_names_country.type = 'country'
+        LEFT JOIN geo_names geo_names_city ON geo_names_city.id = nodes.city_id AND geo_names_city.type = 'city'
+        WHERE geo_names_country.id = ?
+        ORDER BY capacity DESC
+      `;
+
+      const [rows]: any = await DB.query(query, [countryId]);
+      for (let i = 0; i < rows.length; ++i) {
+        rows[i].city = JSON.parse(rows[i].city);
+      }
+      return rows;
+    } catch (e) {
+      logger.err(`Cannot get nodes for country id ${countryId}. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
+  public async $getNodesPerISP(ISPId: string) {
+    try {
+      const query = `
+        SELECT node_stats.public_key, node_stats.capacity, node_stats.channels, nodes.alias,
+          UNIX_TIMESTAMP(nodes.first_seen) as first_seen, UNIX_TIMESTAMP(nodes.updated_at) as updated_at,
+          geo_names_city.names as city, geo_names_country.names as country
+        FROM node_stats
+        JOIN (
+          SELECT public_key, MAX(added) as last_added
+          FROM node_stats
+          GROUP BY public_key
+        ) as b ON b.public_key = node_stats.public_key AND b.last_added = node_stats.added
+        RIGHT JOIN nodes ON nodes.public_key = node_stats.public_key
+        JOIN geo_names geo_names_country ON geo_names_country.id = nodes.country_id AND geo_names_country.type = 'country'
+        LEFT JOIN geo_names geo_names_city ON geo_names_city.id = nodes.city_id AND geo_names_city.type = 'city'
+        WHERE nodes.as_number IN (?)
+        ORDER BY capacity DESC
+      `;
+
+      const [rows]: any = await DB.query(query, [ISPId.split(',')]);
+      for (let i = 0; i < rows.length; ++i) {
+        rows[i].country = JSON.parse(rows[i].country);
+        rows[i].city = JSON.parse(rows[i].city);
+      }
+      return rows;
+    } catch (e) {
+      logger.err(`Cannot get nodes for ISP id ${ISPId}. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
+  public async $getNodesCountries() {
+    try {
+      let query = `SELECT geo_names.names as names, geo_names_iso.names as iso_code, COUNT(DISTINCT nodes.public_key) as nodesCount, SUM(capacity) as capacity
+        FROM nodes
+        JOIN geo_names ON geo_names.id = nodes.country_id AND geo_names.type = 'country'
+        JOIN geo_names geo_names_iso ON geo_names_iso.id = nodes.country_id AND geo_names_iso.type = 'country_iso_code'
+        JOIN channels ON channels.node1_public_key = nodes.public_key OR channels.node2_public_key = nodes.public_key
+        GROUP BY country_id
+        ORDER BY COUNT(DISTINCT nodes.public_key) DESC
+      `;
+      const [nodesCountPerCountry]: any = await DB.query(query);
+
+      query = `SELECT COUNT(*) as total FROM nodes WHERE country_id IS NOT NULL`;
+      const [nodesWithAS]: any = await DB.query(query);
+
+      const nodesPerCountry: any[] = [];
+      for (const country of nodesCountPerCountry) {
+        nodesPerCountry.push({
+          name: JSON.parse(country.names),
+          iso: country.iso_code, 
+          count: country.nodesCount,
+          share: Math.floor(country.nodesCount / nodesWithAS[0].total * 10000) / 100,
+          capacity: country.capacity,
+        })
+      }
+
+      return nodesPerCountry;
+    } catch (e) {
+      logger.err(`Cannot get nodes grouped by AS. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+}
+
+export default new NodesApi();

backend/src/api/explorer/nodes.routes.ts

@@ -0,0 +1,155 @@
+import config from '../../config';
+import { Application, Request, Response } from 'express';
+import nodesApi from './nodes.api';
+import DB from '../../database';
+
+class NodesRoutes {
+  constructor() { }
+
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/country/:country', this.$getNodesPerCountry)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/search/:search', this.$searchNode)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/top', this.$getTopNodes)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/isp-ranking', this.$getISPRanking)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/isp/:isp', this.$getNodesPerISP)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/countries', this.$getNodesCountries)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/:public_key/statistics', this.$getHistoricalNodeStats)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'lightning/nodes/:public_key', this.$getNode)
+    ;
+  }
+
+  private async $searchNode(req: Request, res: Response) {
+    try {
+      const nodes = await nodesApi.$searchNodeByPublicKeyOrAlias(req.params.search);
+      res.json(nodes);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getNode(req: Request, res: Response) {
+    try {
+      const node = await nodesApi.$getNode(req.params.public_key);
+      if (!node) {
+        res.status(404).send('Node not found');
+        return;
+      }
+      res.json(node);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getHistoricalNodeStats(req: Request, res: Response) {
+    try {
+      const statistics = await nodesApi.$getNodeStats(req.params.public_key);
+      res.json(statistics);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getTopNodes(req: Request, res: Response) {
+    try {
+      const topCapacityNodes = await nodesApi.$getTopCapacityNodes();
+      const topChannelsNodes = await nodesApi.$getTopChannelsNodes();
+      res.json({
+        topByCapacity: topCapacityNodes,
+        topByChannels: topChannelsNodes,
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getISPRanking(req: Request, res: Response): Promise<void> {
+    try {
+      const groupBy = req.query.groupBy as string;
+      const showTor = req.query.showTor as string === 'true' ? true : false;
+
+      if (!['capacity', 'node-count'].includes(groupBy)) {
+        res.status(400).send(`groupBy must be one of 'capacity' or 'node-count'`);
+        return;
+      }
+
+      const nodesPerAs = await nodesApi.$getNodesISP(groupBy, showTor);
+
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 600).toUTCString());
+      res.json(nodesPerAs);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getNodesPerCountry(req: Request, res: Response) {
+    try {
+      const [country]: any[] = await DB.query(
+        `SELECT geo_names.id, geo_names_country.names as country_names
+        FROM geo_names
+        JOIN geo_names geo_names_country on geo_names.id = geo_names_country.id AND geo_names_country.type = 'country'
+        WHERE geo_names.type = 'country_iso_code' AND geo_names.names = ?`,
+        [req.params.country]
+      );
+
+      if (country.length === 0) {
+        res.status(404).send(`This country does not exist or does not host any lightning nodes on clearnet`);
+        return;
+      }
+
+      const nodes = await nodesApi.$getNodesPerCountry(country[0].id);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json({
+        country: JSON.parse(country[0].country_names),
+        nodes: nodes,
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getNodesPerISP(req: Request, res: Response) {
+    try {
+      const [isp]: any[] = await DB.query(
+        `SELECT geo_names.names as isp_name
+        FROM geo_names
+        WHERE geo_names.type = 'as_organization' AND geo_names.id = ?`,
+        [req.params.isp]
+      );
+
+      if (isp.length === 0) {
+        res.status(404).send(`This ISP does not exist or does not host any lightning nodes on clearnet`);
+        return;
+      }
+
+      const nodes = await nodesApi.$getNodesPerISP(req.params.isp);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json({
+        isp: JSON.parse(isp[0].isp_name),
+        nodes: nodes,
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getNodesCountries(req: Request, res: Response) {
+    try {
+      const nodesPerAs = await nodesApi.$getNodesCountries();
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 600).toUTCString());
+      res.json(nodesPerAs);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+}
+
+export default new NodesRoutes();

backend/src/api/explorer/statistics.api.ts

@@ -0,0 +1,52 @@
+import logger from '../../logger';
+import DB from '../../database';
+import { Common } from '../common';
+
+class StatisticsApi {
+  public async $getStatistics(interval: string | null = null): Promise<any> {
+    interval = Common.getSqlInterval(interval);
+
+    let query = `SELECT UNIX_TIMESTAMP(added) AS added, channel_count, total_capacity, tor_nodes, clearnet_nodes, unannounced_nodes
+      FROM lightning_stats`;
+
+    if (interval) {
+      query += ` WHERE added BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+    }
+
+    query += ` ORDER BY added DESC`;
+
+    try {
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('$getStatistics error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getLatestStatistics(): Promise<any> {
+    try {
+      const [rows]: any = await DB.query(`SELECT * FROM lightning_stats ORDER BY added DESC LIMIT 1`);
+      const [rows2]: any = await DB.query(`SELECT * FROM lightning_stats ORDER BY added DESC LIMIT 1 OFFSET 7`);
+      return {
+        latest: rows[0],
+        previous: rows2[0],
+      };
+    } catch (e) {
+      logger.err('$getLatestStatistics error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getStatisticsCount(): Promise<number> {
+    try {
+      const [rows]: any = await DB.query(`SELECT count(*) as count FROM lightning_stats`);
+      return rows[0].count;
+    } catch (e) {
+      logger.err('$getLatestStatistics error: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+}
+
+export default new StatisticsApi();

backend/src/api/fee-api.ts

@@ -1,44 +1,51 @@
-import config from '../config';
 import { MempoolBlock } from '../mempool.interfaces';
+import { Common } from './common';
+import mempool from './mempool';
 import projectedBlocks from './mempool-blocks';
 
 class FeeApi {
   constructor() { }
 
-  defaultFee = config.MEMPOOL.NETWORK === 'liquid' ? 0.1 : 1;
+  defaultFee = Common.isLiquid() ? 0.1 : 1;
 
   public getRecommendedFee() {
     const pBlocks = projectedBlocks.getMempoolBlocks();
+    const mPool = mempool.getMempoolInfo();
+    const minimumFee = Math.ceil(mPool.mempoolminfee * 100000);
 
     if (!pBlocks.length) {
       return {
         'fastestFee': this.defaultFee,
         'halfHourFee': this.defaultFee,
         'hourFee': this.defaultFee,
+        'economyFee': minimumFee,
+        'minimumFee': minimumFee,
       };
     }
 
-    const firstMedianFee = this.optimizeMedianFee(pBlocks[0]);
-    const secondMedianFee = pBlocks[1] ? this.optimizeMedianFee(pBlocks[1], firstMedianFee) : this.defaultFee;
-    const thirdMedianFee = pBlocks[2] ? this.optimizeMedianFee(pBlocks[2], secondMedianFee) : this.defaultFee;
+    const firstMedianFee = this.optimizeMedianFee(pBlocks[0], pBlocks[1]);
+    const secondMedianFee = pBlocks[1] ? this.optimizeMedianFee(pBlocks[1], pBlocks[2], firstMedianFee) : this.defaultFee;
+    const thirdMedianFee = pBlocks[2] ? this.optimizeMedianFee(pBlocks[2], pBlocks[3], secondMedianFee) : this.defaultFee;
 
     return {
       'fastestFee': firstMedianFee,
       'halfHourFee': secondMedianFee,
       'hourFee': thirdMedianFee,
+      'economyFee': Math.min(2 * minimumFee, thirdMedianFee),
+      'minimumFee': minimumFee,
     };
   }
 
-  private optimizeMedianFee(pBlock: MempoolBlock, previousFee?: number): number {
+  private optimizeMedianFee(pBlock: MempoolBlock, nextBlock: MempoolBlock | undefined, previousFee?: number): number {
     const useFee = previousFee ? (pBlock.medianFee + previousFee) / 2 : pBlock.medianFee;
     if (pBlock.blockVSize <= 500000) {
       return this.defaultFee;
     }
-    if (pBlock.blockVSize <= 950000) {
+    if (pBlock.blockVSize <= 950000 && !nextBlock) {
       const multiplier = (pBlock.blockVSize - 500000) / 500000;
       return Math.max(Math.round(useFee * multiplier), this.defaultFee);
     }
-    return Math.round(useFee);
+    return Math.ceil(useFee);
   }
 }
 

backend/src/api/fiat-conversion.ts

@@ -1,22 +1,40 @@
 import logger from '../logger';
-import axios from 'axios';
+import * as http from 'http';
+import * as https from 'https';
+import axios, { AxiosResponse } from 'axios';
 import { IConversionRates } from '../mempool.interfaces';
+import config from '../config';
+import backendInfo from './backend-info';
+import { SocksProxyAgent } from 'socks-proxy-agent';
 
 class FiatConversion {
-  private conversionRates: IConversionRates = {
-    'USD': 0
-  };
+  private debasingFiatCurrencies = ['AED', 'AUD', 'BDT', 'BHD', 'BMD', 'BRL', 'CAD', 'CHF', 'CLP',
+    'CNY', 'CZK', 'DKK', 'EUR', 'GBP', 'HKD', 'HUF', 'IDR', 'ILS', 'INR', 'JPY', 'KRW', 'KWD',
+    'LKR', 'MMK', 'MXN', 'MYR', 'NGN', 'NOK', 'NZD', 'PHP', 'PKR', 'PLN', 'RUB', 'SAR', 'SEK',
+    'SGD', 'THB', 'TRY', 'TWD', 'UAH', 'USD', 'VND', 'ZAR'];
+  private conversionRates: IConversionRates = {};
   private ratesChangedCallback: ((rates: IConversionRates) => void) | undefined;
+  public ratesInitialized = false; // If true, it means rates are ready for use
 
-  constructor() { }
+  constructor() {
+    for (const fiat of this.debasingFiatCurrencies) {
+      this.conversionRates[fiat] = 0;
+    }
+  }
 
   public setProgressChangedCallback(fn: (rates: IConversionRates) => void) {
     this.ratesChangedCallback = fn;
   }
 
   public startService() {
+    const fiatConversionUrl = (config.SOCKS5PROXY.ENABLED === true) && (config.SOCKS5PROXY.USE_ONION === true) ? config.PRICE_DATA_SERVER.TOR_URL : config.PRICE_DATA_SERVER.CLEARNET_URL;
     logger.info('Starting currency rates service');
-    setInterval(this.updateCurrency.bind(this), 1000 * 60 * 60);
+    if (config.SOCKS5PROXY.ENABLED) {
+      logger.info(`Currency rates service will be queried over the Tor network using ${fiatConversionUrl}`);
+    } else {
+      logger.info(`Currency rates service will be queried over clearnet using ${config.PRICE_DATA_SERVER.CLEARNET_URL}`);
+    }
+    setInterval(this.updateCurrency.bind(this), 1000 * config.MEMPOOL.PRICE_FEED_UPDATE_INTERVAL);
     this.updateCurrency();
   }
 
@@ -25,17 +43,79 @@ class FiatConversion {
   }
 
   private async updateCurrency(): Promise<void> {
-    try {
-      const response = await axios.get('https://price.bisq.wiz.biz/getAllMarketPrices');
-      const usd = response.data.data.find((item: any) => item.currencyCode === 'USD');
-      this.conversionRates = {
-        'USD': usd.price,
+    type axiosOptions = {
+      headers: {
+        'User-Agent': string
       };
-      if (this.ratesChangedCallback) {
-        this.ratesChangedCallback(this.conversionRates);
+      timeout: number;
+      httpAgent?: http.Agent;
+      httpsAgent?: https.Agent;
+    }
+    const setDelay = (secs: number = 1): Promise<void> => new Promise(resolve => setTimeout(() => resolve(), secs * 1000));
+    const fiatConversionUrl = (config.SOCKS5PROXY.ENABLED === true) && (config.SOCKS5PROXY.USE_ONION === true) ? config.PRICE_DATA_SERVER.TOR_URL : config.PRICE_DATA_SERVER.CLEARNET_URL;
+    const isHTTP = (new URL(fiatConversionUrl).protocol.split(':')[0] === 'http') ? true : false;
+    const axiosOptions: axiosOptions = {
+      headers: {
+        'User-Agent': (config.MEMPOOL.USER_AGENT === 'mempool') ? `mempool/v${backendInfo.getBackendInfo().version}` : `${config.MEMPOOL.USER_AGENT}`
+      },
+      timeout: config.SOCKS5PROXY.ENABLED ? 30000 : 10000
+    };
+
+    let retry = 0;
+
+    while(retry < config.MEMPOOL.EXTERNAL_MAX_RETRY) {
+      try {
+        if (config.SOCKS5PROXY.ENABLED) {
+          let socksOptions: any = {
+            agentOptions: {
+              keepAlive: true,
+            },
+            hostname: config.SOCKS5PROXY.HOST,
+            port: config.SOCKS5PROXY.PORT
+          };
+
+          if (config.SOCKS5PROXY.USERNAME && config.SOCKS5PROXY.PASSWORD) {
+            socksOptions.username = config.SOCKS5PROXY.USERNAME;
+            socksOptions.password = config.SOCKS5PROXY.PASSWORD;
+          } else {
+            // Retry with different tor circuits https://stackoverflow.com/a/64960234
+            socksOptions.username = `circuit${retry}`;
+          }
+
+          // Handle proxy agent for onion addresses
+          if (isHTTP) {
+            axiosOptions.httpAgent = new SocksProxyAgent(socksOptions);
+          } else {
+            axiosOptions.httpsAgent = new SocksProxyAgent(socksOptions);
+          }
+        }
+        
+        logger.debug('Querying currency rates service...');
+
+        const response: AxiosResponse = await axios.get(`${fiatConversionUrl}`, axiosOptions);
+
+        if (response.statusText === 'error' || !response.data) {
+          throw new Error(`Could not fetch data from ${fiatConversionUrl}, Error: ${response.status}`);
+        }
+
+        for (const rate of response.data.data) {
+          if (this.debasingFiatCurrencies.includes(rate.currencyCode) && rate.provider === 'Bisq-Aggregate') {
+            this.conversionRates[rate.currencyCode] = Math.round(100 * rate.price) / 100;
+          }
+        }
+
+        this.ratesInitialized = true;
+        logger.debug(`USD Conversion Rate: ${this.conversionRates.USD}`);
+
+        if (this.ratesChangedCallback) {
+          this.ratesChangedCallback(this.conversionRates);
+        }
+        break;
+      } catch (e) {
+        logger.err('Error updating fiat conversion rates: '  + (e instanceof Error ? e.message : e));
+        await setDelay(config.MEMPOOL.EXTERNAL_RETRY_INTERVAL);
+        retry++;
       }
-    } catch (e) {
-      logger.err('Error updating fiat conversion rates: ' + e);
     }
   }
 }

backend/src/api/lightning/lightning-api-abstract-factory.ts

@@ -0,0 +1,7 @@
+import { ILightningApi } from './lightning-api.interface';
+
+export interface AbstractLightningApi {
+  $getNetworkInfo(): Promise<ILightningApi.NetworkInfo>;
+  $getNetworkGraph(): Promise<ILightningApi.NetworkGraph>;
+  $getInfo(): Promise<ILightningApi.Info>;
+}

backend/src/api/lightning/lightning-api-factory.ts

@@ -0,0 +1,13 @@
+import config from '../../config';
+import { AbstractLightningApi } from './lightning-api-abstract-factory';
+import LndApi from './lnd/lnd-api';
+
+function lightningApiFactory(): AbstractLightningApi {
+  switch (config.LIGHTNING.BACKEND) {
+    case 'lnd':
+    default:
+      return new LndApi();
+  }
+}
+
+export default lightningApiFactory();

backend/src/api/lightning/lightning-api.interface.ts

@@ -0,0 +1,71 @@
+export namespace ILightningApi {
+  export interface NetworkInfo {
+    average_channel_size: number;
+    channel_count: number;
+    max_channel_size: number;
+    median_channel_size: number;
+    min_channel_size: number;
+    node_count: number;
+    not_recently_updated_policy_count: number;
+    total_capacity: number;
+  }
+
+  export interface NetworkGraph {
+    channels: Channel[];
+    nodes: Node[];
+  }
+
+  export interface Channel {
+    id: string;
+    capacity: number;
+    policies: Policy[];
+    transaction_id: string;
+    transaction_vout: number;
+    updated_at?: string;
+  }
+
+  interface Policy {
+    public_key: string;
+    base_fee_mtokens?: string;
+    cltv_delta?: number;
+    fee_rate?: number;
+    is_disabled?: boolean;
+    max_htlc_mtokens?: string;
+    min_htlc_mtokens?: string;
+    updated_at?: string;
+  }
+
+  export interface Node {
+    alias: string;
+    color: string;
+    features: Feature[];
+    public_key: string;
+    sockets: string[];
+    updated_at?: string;
+  }
+
+  export interface Info {
+    chains: string[];
+    color: string;
+    active_channels_count: number;
+    alias: string;
+    current_block_hash: string;
+    current_block_height: number;
+    features: Feature[];
+    is_synced_to_chain: boolean;
+    is_synced_to_graph: boolean;
+    latest_block_at: string;
+    peers_count: number;
+    pending_channels_count: number;
+    public_key: string;
+    uris: any[];
+    version: string;
+  }
+  
+  export interface Feature {
+    bit: number;
+    is_known: boolean;
+    is_required: boolean;
+    type?: string;
+  }
+}

backend/src/api/lightning/lnd/lnd-api.ts

@@ -0,0 +1,45 @@
+import { AbstractLightningApi } from '../lightning-api-abstract-factory';
+import { ILightningApi } from '../lightning-api.interface';
+import * as fs from 'fs';
+import { authenticatedLndGrpc, getWalletInfo, getNetworkGraph, getNetworkInfo } from 'lightning';
+import config from '../../../config';
+import logger from '../../../logger';
+
+class LndApi implements AbstractLightningApi {
+  private lnd: any;
+  constructor() {
+    if (!config.LIGHTNING.ENABLED) {
+      return;
+    }
+    try {
+      const tls = fs.readFileSync(config.LND.TLS_CERT_PATH).toString('base64');
+      const macaroon = fs.readFileSync(config.LND.MACAROON_PATH).toString('base64');
+
+      const { lnd } = authenticatedLndGrpc({
+        cert: tls,
+        macaroon: macaroon,
+        socket: config.LND.SOCKET,
+      });
+
+      this.lnd = lnd;
+    } catch (e) {
+      logger.err('Could not initiate the LND service handler: ' + (e instanceof Error ? e.message : e));
+      process.exit(1);
+    }
+  }
+
+  async $getNetworkInfo(): Promise<ILightningApi.NetworkInfo> {
+    return await getNetworkInfo({ lnd: this.lnd });
+  }
+
+  async $getInfo(): Promise<ILightningApi.Info> {
+    // @ts-ignore
+    return await getWalletInfo({ lnd: this.lnd });
+  }
+
+  async $getNetworkGraph(): Promise<ILightningApi.NetworkGraph> {
+    return await getNetworkGraph({ lnd: this.lnd });
+  }
+}
+
+export default LndApi;

backend/src/api/liquid/elements-parser.ts

@@ -0,0 +1,103 @@
+import { IBitcoinApi } from '../bitcoin/bitcoin-api.interface';
+import bitcoinClient from '../bitcoin/bitcoin-client';
+import bitcoinSecondClient from '../bitcoin/bitcoin-second-client';
+import { Common } from '../common';
+import DB from '../../database';
+import logger from '../../logger';
+
+class ElementsParser {
+  private isRunning = false;
+
+  constructor() { }
+
+  public async $parse() {
+    if (this.isRunning) {
+      return;
+    }
+    try {
+      this.isRunning = true;
+      const result = await bitcoinClient.getChainTips();
+      const tip = result[0].height;
+      const latestBlockHeight = await this.$getLatestBlockHeightFromDatabase();
+      for (let height = latestBlockHeight + 1; height <= tip; height++) {
+        const blockHash: IBitcoinApi.ChainTips = await bitcoinClient.getBlockHash(height);
+        const block: IBitcoinApi.Block = await bitcoinClient.getBlock(blockHash, 2);
+        await this.$parseBlock(block);
+        await this.$saveLatestBlockToDatabase(block.height);
+      }
+      this.isRunning = false;
+    } catch (e) {
+      this.isRunning = false;
+      throw new Error(e instanceof Error ? e.message : 'Error');
+    }
+  }
+
+  public async $getPegDataByMonth(): Promise<any> {
+    const query = `SELECT SUM(amount) AS amount, DATE_FORMAT(FROM_UNIXTIME(datetime), '%Y-%m-01') AS date FROM elements_pegs GROUP BY DATE_FORMAT(FROM_UNIXTIME(datetime), '%Y%m')`;
+    const [rows] = await DB.query(query);
+    return rows;
+  }
+
+  protected async $parseBlock(block: IBitcoinApi.Block) {
+    for (const tx of block.tx) {
+      await this.$parseInputs(tx, block);
+      await this.$parseOutputs(tx, block);
+    }
+  }
+
+  protected async $parseInputs(tx: IBitcoinApi.Transaction, block: IBitcoinApi.Block) {
+    for (const [index, input] of tx.vin.entries()) {
+      if (input.is_pegin) {
+        await this.$parsePegIn(input, index, tx.txid, block);
+      }
+    }
+  }
+
+  protected async $parsePegIn(input: IBitcoinApi.Vin, vindex: number, txid: string, block: IBitcoinApi.Block) {
+    const bitcoinTx: IBitcoinApi.Transaction = await bitcoinSecondClient.getRawTransaction(input.txid, true);
+    const prevout = bitcoinTx.vout[input.vout || 0];
+    const outputAddress = prevout.scriptPubKey.address || (prevout.scriptPubKey.addresses && prevout.scriptPubKey.addresses[0]) || '';
+    await this.$savePegToDatabase(block.height, block.time, prevout.value * 100000000, txid, vindex,
+      outputAddress, bitcoinTx.txid, prevout.n, 1);
+  }
+
+  protected async $parseOutputs(tx: IBitcoinApi.Transaction, block: IBitcoinApi.Block) {
+    for (const output of tx.vout) {
+      if (output.scriptPubKey.pegout_chain) {
+        await this.$savePegToDatabase(block.height, block.time, 0 - output.value * 100000000, tx.txid, output.n,
+          (output.scriptPubKey.pegout_addresses && output.scriptPubKey.pegout_addresses[0] || ''), '', 0, 0);
+      }
+      if (!output.scriptPubKey.pegout_chain && output.scriptPubKey.type === 'nulldata'
+        && output.value && output.value > 0 && output.asset && output.asset === Common.nativeAssetId) {
+        await this.$savePegToDatabase(block.height, block.time, 0 - output.value * 100000000, tx.txid, output.n,
+          (output.scriptPubKey.pegout_addresses && output.scriptPubKey.pegout_addresses[0] || ''), '', 0, 1);
+      }
+    }
+  }
+
+  protected async $savePegToDatabase(height: number, blockTime: number, amount: number, txid: string,
+    txindex: number, bitcoinaddress: string, bitcointxid: string, bitcoinindex: number, final_tx: number): Promise<void> {
+    const query = `INSERT INTO elements_pegs(
+        block, datetime, amount, txid, txindex, bitcoinaddress, bitcointxid, bitcoinindex, final_tx
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`;
+
+    const params: (string | number)[] = [
+      height, blockTime, amount, txid, txindex, bitcoinaddress, bitcointxid, bitcoinindex, final_tx
+    ];
+    await DB.query(query, params);
+    logger.debug(`Saved L-BTC peg from block height #${height} with TXID ${txid}.`);
+  }
+
+  protected async $getLatestBlockHeightFromDatabase(): Promise<number> {
+    const query = `SELECT number FROM state WHERE name = 'last_elements_block'`;
+    const [rows] = await DB.query(query);
+    return rows[0]['number'];
+  }
+
+  protected async $saveLatestBlockToDatabase(blockHeight: number) {
+    const query = `UPDATE state SET number = ? WHERE name = 'last_elements_block'`;
+    await DB.query(query, [blockHeight]);
+  }
+}
+
+export default new ElementsParser();

backend/src/api/liquid/icons.ts

@@ -0,0 +1,38 @@
+import * as fs from 'fs';
+import logger from '../../logger';
+
+class Icons {
+  private static FILE_NAME = './icons.json';
+  private iconIds: string[] = [];
+  private icons: { [assetId: string]: string; } = {};
+
+  constructor() {}
+
+  public loadIcons() {
+    if (!fs.existsSync(Icons.FILE_NAME)) {
+      logger.warn(`${Icons.FILE_NAME} does not exist. No Liquid icons loaded.`);
+      return;
+    }
+    const cacheData = fs.readFileSync(Icons.FILE_NAME, 'utf8');
+    this.icons = JSON.parse(cacheData);
+
+    for (const i in this.icons) {
+      this.iconIds.push(i);
+    }
+    logger.debug(`Liquid icons has been loaded.`);
+  }
+
+  public getIconByAssetId(assetId: string): Buffer | undefined {
+    const icon = this.icons[assetId];
+    if (icon) {
+      return Buffer.from(icon, 'base64');
+    }
+  }
+
+  public getAllIconIds() {
+    return this.iconIds;
+  }
+
+}
+
+export default new Icons();

backend/src/api/liquid/liquid.routes.ts

@@ -0,0 +1,73 @@
+import axios from 'axios';
+import { Application, Request, Response } from 'express';
+import config from '../../config';
+import elementsParser from './elements-parser';
+import icons from './icons';
+
+class LiquidRoutes {
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'assets/icons', this.getAllLiquidIcon)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'assets/featured', this.$getAllFeaturedLiquidAssets)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'asset/:assetId/icon', this.getLiquidIcon)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'assets/group/:id', this.$getAssetGroup)
+      ;
+    
+    if (config.DATABASE.ENABLED) {
+      app
+        .get(config.MEMPOOL.API_URL_PREFIX + 'liquid/pegs/month', this.$getElementsPegsByMonth)
+        ;
+    }
+  }
+
+
+  private getLiquidIcon(req: Request, res: Response) {
+    const result = icons.getIconByAssetId(req.params.assetId);
+    if (result) {
+      res.setHeader('content-type', 'image/png');
+      res.setHeader('content-length', result.length);
+      res.send(result);
+    } else {
+      res.status(404).send('Asset icon not found');
+    }
+  }
+
+  private getAllLiquidIcon(req: Request, res: Response) {
+    const result = icons.getAllIconIds();
+    if (result) {
+      res.json(result);
+    } else {
+      res.status(404).send('Asset icons not found');
+    }
+  }
+
+  private async $getAllFeaturedLiquidAssets(req: Request, res: Response) {
+    try {
+      const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.LIQUID_API}/assets/featured`, { responseType: 'stream', timeout: 10000 });
+      response.data.pipe(res);
+    } catch (e) {
+      res.status(500).end();
+    }
+  }
+
+  private async $getAssetGroup(req: Request, res: Response) {
+    try {
+      const response = await axios.get(`${config.EXTERNAL_DATA_SERVER.LIQUID_API}/assets/group/${parseInt(req.params.id, 10)}`,
+        { responseType: 'stream', timeout: 10000 });
+      response.data.pipe(res);
+    } catch (e) {
+      res.status(500).end();
+    }
+  }
+
+  private async $getElementsPegsByMonth(req: Request, res: Response) {
+    try {
+      const pegs = await elementsParser.$getPegDataByMonth();
+      res.json(pegs);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+}
+
+export default new LiquidRoutes();

backend/src/api/loading-indicators.ts

@@ -12,8 +12,8 @@ class LoadingIndicators {
     this.progressChangedCallback = fn;
   }
 
-  public setProgress(name: string, progressPercent: number) {
-    const newProgress = Math.round(progressPercent);
+  public setProgress(name: string, progressPercent: number, rounded: boolean = true) {
+    const newProgress = rounded === true ? Math.round(progressPercent) : progressPercent;
     if (newProgress >= 100) {
       delete this.loadingIndicators[name];
     } else {

backend/src/api/mempool-blocks.ts

@@ -1,9 +1,11 @@
-import { MempoolBlock, TransactionExtended, MempoolBlockWithTransactions } from '../mempool.interfaces';
+import logger from '../logger';
+import { MempoolBlock, TransactionExtended, TransactionStripped, MempoolBlockWithTransactions, MempoolBlockDelta } from '../mempool.interfaces';
 import { Common } from './common';
+import config from '../config';
 
 class MempoolBlocks {
-  private static DEFAULT_PROJECTED_BLOCKS_AMOUNT = 8;
   private mempoolBlocks: MempoolBlockWithTransactions[] = [];
+  private mempoolBlockDeltas: MempoolBlockDelta[] = [];
 
   constructor() {}
 
@@ -24,6 +26,10 @@ class MempoolBlocks {
     return this.mempoolBlocks;
   }
 
+  public getMempoolBlockDeltas(): MempoolBlockDelta[] {
+    return this.mempoolBlockDeltas;
+  }
+
   public updateMempoolBlocks(memPool: { [txid: string]: TransactionExtended }): void {
     const latestMempool = memPool;
     const memPoolArray: TransactionExtended[] = [];
@@ -32,36 +38,108 @@ class MempoolBlocks {
         memPoolArray.push(latestMempool[i]);
       }
     }
+    const start = new Date().getTime();
+
+    // Clear bestDescendants & ancestors
+    memPoolArray.forEach((tx) => {
+      tx.bestDescendant = null;
+      tx.ancestors = [];
+      tx.cpfpChecked = false;
+      if (!tx.effectiveFeePerVsize) {
+        tx.effectiveFeePerVsize = tx.feePerVsize;
+      }
+    });
+
+    // First sort
     memPoolArray.sort((a, b) => b.feePerVsize - a.feePerVsize);
-    const transactionsSorted = memPoolArray.filter((tx) => tx.feePerVsize);
-    this.mempoolBlocks = this.calculateMempoolBlocks(transactionsSorted);
+
+    // Loop through and traverse all ancestors and sum up all the sizes + fees
+    // Pass down size + fee to all unconfirmed children
+    let sizes = 0;
+    memPoolArray.forEach((tx, i) => {
+      sizes += tx.weight;
+      if (sizes > 4000000 * 8) {
+        return;
+      }
+      Common.setRelativesAndGetCpfpInfo(tx, memPool);
+    });
+
+    // Final sort, by effective fee
+    memPoolArray.sort((a, b) => b.effectiveFeePerVsize - a.effectiveFeePerVsize);
+
+    const end = new Date().getTime();
+    const time = end - start;
+    logger.debug('Mempool blocks calculated in ' + time / 1000 + ' seconds');
+
+    const { blocks, deltas } = this.calculateMempoolBlocks(memPoolArray, this.mempoolBlocks);
+    this.mempoolBlocks = blocks;
+    this.mempoolBlockDeltas = deltas;
   }
 
-  private calculateMempoolBlocks(transactionsSorted: TransactionExtended[]): MempoolBlockWithTransactions[] {
+  private calculateMempoolBlocks(transactionsSorted: TransactionExtended[], prevBlocks: MempoolBlockWithTransactions[]):
+    { blocks: MempoolBlockWithTransactions[], deltas: MempoolBlockDelta[] } {
     const mempoolBlocks: MempoolBlockWithTransactions[] = [];
-    let blockVSize = 0;
+    const mempoolBlockDeltas: MempoolBlockDelta[] = [];
+    let blockWeight = 0;
     let blockSize = 0;
     let transactions: TransactionExtended[] = [];
     transactionsSorted.forEach((tx) => {
-      if (blockVSize + tx.vsize <= 1000000 || mempoolBlocks.length === MempoolBlocks.DEFAULT_PROJECTED_BLOCKS_AMOUNT - 1) {
-        blockVSize += tx.vsize;
+      if (blockWeight + tx.weight <= config.MEMPOOL.BLOCK_WEIGHT_UNITS
+        || mempoolBlocks.length === config.MEMPOOL.MEMPOOL_BLOCKS_AMOUNT - 1) {
+        blockWeight += tx.weight;
         blockSize += tx.size;
         transactions.push(tx);
       } else {
-        mempoolBlocks.push(this.dataToMempoolBlocks(transactions, blockSize, blockVSize, mempoolBlocks.length));
-        blockVSize = tx.vsize;
+        mempoolBlocks.push(this.dataToMempoolBlocks(transactions, blockSize, blockWeight, mempoolBlocks.length));
+        blockWeight = tx.weight;
         blockSize = tx.size;
         transactions = [tx];
       }
     });
     if (transactions.length) {
-      mempoolBlocks.push(this.dataToMempoolBlocks(transactions, blockSize, blockVSize, mempoolBlocks.length));
+      mempoolBlocks.push(this.dataToMempoolBlocks(transactions, blockSize, blockWeight, mempoolBlocks.length));
     }
-    return mempoolBlocks;
+    // Calculate change from previous block states
+    for (let i = 0; i < Math.max(mempoolBlocks.length, prevBlocks.length); i++) {
+      let added: TransactionStripped[] = [];
+      let removed: string[] = [];
+      if (mempoolBlocks[i] && !prevBlocks[i]) {
+        added = mempoolBlocks[i].transactions;
+      } else if (!mempoolBlocks[i] && prevBlocks[i]) {
+        removed = prevBlocks[i].transactions.map(tx => tx.txid);
+      } else if (mempoolBlocks[i] && prevBlocks[i]) {
+        const prevIds = {};
+        const newIds = {};
+        prevBlocks[i].transactions.forEach(tx => {
+          prevIds[tx.txid] = true;
+        });
+        mempoolBlocks[i].transactions.forEach(tx => {
+          newIds[tx.txid] = true;
+        });
+        prevBlocks[i].transactions.forEach(tx => {
+          if (!newIds[tx.txid]) {
+            removed.push(tx.txid);
+          }
+        });
+        mempoolBlocks[i].transactions.forEach(tx => {
+          if (!prevIds[tx.txid]) {
+            added.push(tx);
+          }
+        });
+      }
+      mempoolBlockDeltas.push({
+        added,
+        removed
+      });
+    }
+    return {
+      blocks: mempoolBlocks,
+      deltas: mempoolBlockDeltas
+    };
   }
 
   private dataToMempoolBlocks(transactions: TransactionExtended[],
-    blockSize: number, blockVSize: number, blocksIndex: number): MempoolBlockWithTransactions {
+    blockSize: number, blockWeight: number, blocksIndex: number): MempoolBlockWithTransactions {
     let rangeLength = 4;
     if (blocksIndex === 0) {
       rangeLength = 8;
@@ -73,12 +151,13 @@ class MempoolBlocks {
     }
     return {
       blockSize: blockSize,
-      blockVSize: blockVSize,
+      blockVSize: blockWeight / 4,
       nTx: transactions.length,
       totalFees: transactions.reduce((acc, cur) => acc + cur.fee, 0),
-      medianFee: Common.median(transactions.map((tx) => tx.feePerVsize)),
+      medianFee: Common.percentile(transactions.map((tx) => tx.effectiveFeePerVsize), config.MEMPOOL.RECOMMENDED_FEE_PERCENTILE),
       feeRange: Common.getFeesInRange(transactions, rangeLength),
       transactionIds: transactions.map((tx) => tx.txid),
+      transactions: transactions.map((tx) => Common.stripTransaction(tx)),
     };
   }
 }

backend/src/api/mempool.ts

@@ -5,15 +5,19 @@ import logger from '../logger';
 import { Common } from './common';
 import transactionUtils from './transaction-utils';
 import { IBitcoinApi } from './bitcoin/bitcoin-api.interface';
-import bitcoinBaseApi from './bitcoin/bitcoin-base.api';
 import loadingIndicators from './loading-indicators';
+import bitcoinClient from './bitcoin/bitcoin-client';
+import bitcoinSecondClient from './bitcoin/bitcoin-second-client';
+import rbfCache from './rbf-cache';
 
 class Mempool {
   private static WEBSOCKET_REFRESH_RATE_MS = 10000;
+  private static LAZY_DELETE_AFTER_SECONDS = 30;
   private inSync: boolean = false;
+  private mempoolCacheDelta: number = -1;
   private mempoolCache: { [txId: string]: TransactionExtended } = {};
-  private mempoolInfo: IBitcoinApi.MempoolInfo = { loaded: false, size: 0, bytes: 0, usage: 0,
-                                                    maxmempool: 0, mempoolminfee: 0, minrelaytxfee: 0 };
+  private mempoolInfo: IBitcoinApi.MempoolInfo = { loaded: false, size: 0, bytes: 0, usage: 0, total_fee: 0,
+                                                    maxmempool: 300000000, mempoolminfee: 0.00001000, minrelaytxfee: 0.00001000 };
   private mempoolChangedCallback: ((newMempool: {[txId: string]: TransactionExtended; }, newTransactions: TransactionExtended[],
     deletedTransactions: TransactionExtended[]) => void) | undefined;
 
@@ -27,12 +31,29 @@ class Mempool {
 
   constructor() {
     setInterval(this.updateTxPerSecond.bind(this), 1000);
+    setInterval(this.deleteExpiredTransactions.bind(this), 20000);
   }
 
-  public isInSync() {
+  /**
+   * Return true if we should leave resources available for mempool tx caching
+   */
+  public hasPriority(): boolean {
+    if (this.inSync) {
+      return false;
+    } else {
+      return this.mempoolCacheDelta == -1 || this.mempoolCacheDelta > 25;
+    }
+  }
+
+  public isInSync(): boolean {
     return this.inSync;
   }
 
+  public setOutOfSync(): void {
+    this.inSync = false;
+    loadingIndicators.setProgress('mempool', 99);
+  }
+
   public getLatestTransactions() {
     return this.latestTransactions;
   }
@@ -54,10 +75,10 @@ class Mempool {
   }
 
   public async $updateMemPoolInfo() {
-    this.mempoolInfo = await bitcoinBaseApi.$getMempoolInfo();
+    this.mempoolInfo = await this.$getMempoolInfo();
   }
 
-  public getMempoolInfo(): IBitcoinApi.MempoolInfo | undefined {
+  public getMempoolInfo(): IBitcoinApi.MempoolInfo {
     return this.mempoolInfo;
   }
 
@@ -92,14 +113,16 @@ class Mempool {
     const diff = transactions.length - currentMempoolSize;
     const newTransactions: TransactionExtended[] = [];
 
+    this.mempoolCacheDelta = Math.abs(diff);
+
     if (!this.inSync) {
       loadingIndicators.setProgress('mempool', Object.keys(this.mempoolCache).length / transactions.length * 100);
     }
 
     for (const txid of transactions) {
       if (!this.mempoolCache[txid]) {
-        const transaction = await transactionUtils.$getTransactionExtended(txid, true);
-        if (transaction) {
+        try {
+          const transaction = await transactionUtils.$getTransactionExtended(txid);
           this.mempoolCache[txid] = transaction;
           txCount++;
           if (this.inSync) {
@@ -116,8 +139,8 @@ class Mempool {
             logger.debug('Fetched transaction ' + txCount);
           }
           newTransactions.push(transaction);
-        } else {
-          logger.debug('Error finding transaction in mempool.');
+        } catch (e) {
+          logger.debug('Error finding transaction in mempool: ' + (e instanceof Error ? e.message : e));
         }
       }
 
@@ -128,7 +151,6 @@ class Mempool {
 
     // Prevent mempool from clear on bitcoind restart by delaying the deletion
     if (this.mempoolProtection === 0
-      && config.MEMPOOL.BACKEND === 'esplora'
       && currentMempoolSize > 20000
       && transactions.length / currentMempoolSize <= 0.80
     ) {
@@ -138,10 +160,9 @@ class Mempool {
       setTimeout(() => {
         this.mempoolProtection = 2;
         logger.warn('Mempool clear protection resumed.');
-      }, 1000 * 60 * 2);
+      }, 1000 * 60 * config.MEMPOOL.CLEAR_PROTECTION_MINUTES);
     }
 
-    let newMempool = {};
     const deletedTransactions: TransactionExtended[] = [];
 
     if (this.mempoolProtection !== 1) {
@@ -150,38 +171,47 @@ class Mempool {
       const transactionsObject = {};
       transactions.forEach((txId) => transactionsObject[txId] = true);
 
-      // Replace mempool to separate deleted transactions
+      // Flag transactions for lazy deletion
       for (const tx in this.mempoolCache) {
-        if (transactionsObject[tx]) {
-          newMempool[tx] = this.mempoolCache[tx];
-        } else {
+        if (!transactionsObject[tx] && !this.mempoolCache[tx].deleteAfter) {
           deletedTransactions.push(this.mempoolCache[tx]);
+          this.mempoolCache[tx].deleteAfter = new Date().getTime() + Mempool.LAZY_DELETE_AFTER_SECONDS * 1000;
         }
       }
-    } else {
-      newMempool = this.mempoolCache;
     }
 
     const newTransactionsStripped = newTransactions.map((tx) => Common.stripTransaction(tx));
     this.latestTransactions = newTransactionsStripped.concat(this.latestTransactions).slice(0, 6);
 
-    if (!this.inSync && transactions.length === Object.keys(newMempool).length) {
+    if (!this.inSync && transactions.length === Object.keys(this.mempoolCache).length) {
       this.inSync = true;
-      logger.info('The mempool is now in sync!');
+      logger.notice('The mempool is now in sync!');
       loadingIndicators.setProgress('mempool', 100);
     }
 
+    this.mempoolCacheDelta = Math.abs(transactions.length - Object.keys(this.mempoolCache).length);
+
     if (this.mempoolChangedCallback && (hasChange || deletedTransactions.length)) {
-      this.mempoolCache = newMempool;
       this.mempoolChangedCallback(this.mempoolCache, newTransactions, deletedTransactions);
     }
 
     const end = new Date().getTime();
     const time = end - start;
-    logger.debug(`New mempool size: ${Object.keys(newMempool).length} Change: ${diff}`);
+    logger.debug(`New mempool size: ${Object.keys(this.mempoolCache).length} Change: ${diff}`);
     logger.debug('Mempool updated in ' + time / 1000 + ' seconds');
   }
 
+  public handleRbfTransactions(rbfTransactions: { [txid: string]: TransactionExtended; }) {
+    for (const rbfTransaction in rbfTransactions) {
+      if (this.mempoolCache[rbfTransaction]) {
+        // Store replaced transactions
+        rbfCache.add(rbfTransaction, rbfTransactions[rbfTransaction].txid);
+        // Erase the replaced transactions from the local mempool
+        delete this.mempoolCache[rbfTransaction];
+      }
+    }
+  }
+
   private updateTxPerSecond() {
     const nowMinusTimeSpan = new Date().getTime() - (1000 * config.STATISTICS.TX_PER_SECOND_SAMPLE_PERIOD);
     this.txPerSecondArray = this.txPerSecondArray.filter((unixTime) => unixTime > nowMinusTimeSpan);
@@ -194,6 +224,31 @@ class Mempool {
       );
     }
   }
+
+  private deleteExpiredTransactions() {
+    const now = new Date().getTime();
+    for (const tx in this.mempoolCache) {
+      const lazyDeleteAt = this.mempoolCache[tx].deleteAfter;
+      if (lazyDeleteAt && lazyDeleteAt < now) {
+        delete this.mempoolCache[tx];
+      }
+    }
+  }
+
+  private $getMempoolInfo() {
+    if (config.MEMPOOL.USE_SECOND_NODE_FOR_MINFEE) {
+      return Promise.all([
+        bitcoinClient.getMempoolInfo(),
+        bitcoinSecondClient.getMempoolInfo()
+      ]).then(([mempoolInfo, secondMempoolInfo]) => {
+        mempoolInfo.maxmempool = secondMempoolInfo.maxmempool;
+        mempoolInfo.mempoolminfee = secondMempoolInfo.mempoolminfee;
+        mempoolInfo.minrelaytxfee = secondMempoolInfo.minrelaytxfee;
+        return mempoolInfo;
+      });
+    }
+    return bitcoinClient.getMempoolInfo();
+  }
 }
 
 export default new Mempool();

backend/src/api/mining/mining-routes.ts

@@ -0,0 +1,251 @@
+import { Application, Request, Response } from 'express';
+import config from "../../config";
+import logger from '../../logger';
+import BlocksAuditsRepository from '../../repositories/BlocksAuditsRepository';
+import BlocksRepository from '../../repositories/BlocksRepository';
+import DifficultyAdjustmentsRepository from '../../repositories/DifficultyAdjustmentsRepository';
+import HashratesRepository from '../../repositories/HashratesRepository';
+import bitcoinClient from '../bitcoin/bitcoin-client';
+import mining from "./mining";
+
+class MiningRoutes {
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/pools/:interval', this.$getPools)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/pool/:slug/hashrate', this.$getPoolHistoricalHashrate)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/pool/:slug/blocks', this.$getPoolBlocks)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/pool/:slug/blocks/:height', this.$getPoolBlocks)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/pool/:slug', this.$getPool)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/hashrate/pools/:interval', this.$getPoolsHistoricalHashrate)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/hashrate/:interval', this.$getHistoricalHashrate)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/difficulty-adjustments', this.$getDifficultyAdjustments)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/reward-stats/:blockCount', this.$getRewardStats)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/blocks/fees/:interval', this.$getHistoricalBlockFees)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/blocks/rewards/:interval', this.$getHistoricalBlockRewards)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/blocks/fee-rates/:interval', this.$getHistoricalBlockFeeRates)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/blocks/sizes-weights/:interval', this.$getHistoricalBlockSizeAndWeight)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/difficulty-adjustments/:interval', this.$getDifficultyAdjustments)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/blocks/predictions/:interval', this.$getHistoricalBlockPrediction)
+      .get(config.MEMPOOL.API_URL_PREFIX + 'mining/blocks/audit/:hash', this.$getBlockAudit)
+    ;
+  }
+
+  private async $getPool(req: Request, res: Response): Promise<void> {
+    try {
+      const stats = await mining.$getPoolStat(req.params.slug);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(stats);
+    } catch (e) {
+      if (e instanceof Error && e.message.indexOf('This mining pool does not exist') > -1) {
+        res.status(404).send(e.message);
+      } else {
+        res.status(500).send(e instanceof Error ? e.message : e);
+      }
+    }
+  }
+
+  private async $getPoolBlocks(req: Request, res: Response) {
+    try {
+      const poolBlocks = await BlocksRepository.$getBlocksByPool(
+        req.params.slug,
+        req.params.height === undefined ? undefined : parseInt(req.params.height, 10),
+      );
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(poolBlocks);
+    } catch (e) {
+      if (e instanceof Error && e.message.indexOf('This mining pool does not exist') > -1) {
+        res.status(404).send(e.message);
+      } else {
+        res.status(500).send(e instanceof Error ? e.message : e);
+      }
+    }
+  }
+
+  private async $getPools(req: Request, res: Response) {
+    try {
+      const stats = await mining.$getPoolsStats(req.params.interval);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(stats);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getPoolsHistoricalHashrate(req: Request, res: Response) {
+    try {
+      const hashrates = await HashratesRepository.$getPoolsWeeklyHashrate(req.params.interval);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+      res.json(hashrates);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getPoolHistoricalHashrate(req: Request, res: Response) {
+    try {
+      const hashrates = await HashratesRepository.$getPoolWeeklyHashrate(req.params.slug);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+      res.json(hashrates);
+    } catch (e) {
+      if (e instanceof Error && e.message.indexOf('This mining pool does not exist') > -1) {
+        res.status(404).send(e.message);
+      } else {
+        res.status(500).send(e instanceof Error ? e.message : e);
+      }
+    }
+  }
+
+  private async $getHistoricalHashrate(req: Request, res: Response) {
+    let currentHashrate = 0, currentDifficulty = 0;
+    try {
+      currentHashrate = await bitcoinClient.getNetworkHashPs();
+      currentDifficulty = await bitcoinClient.getDifficulty();
+    } catch (e) {
+      logger.debug('Bitcoin Core is not available, using zeroed value for current hashrate and difficulty');
+    }
+
+    try {
+      const hashrates = await HashratesRepository.$getNetworkDailyHashrate(req.params.interval);
+      const difficulty = await DifficultyAdjustmentsRepository.$getAdjustments(req.params.interval, false);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+      res.json({
+        hashrates: hashrates,
+        difficulty: difficulty,
+        currentHashrate: currentHashrate,
+        currentDifficulty: currentDifficulty,
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getHistoricalBlockFees(req: Request, res: Response) {
+    try {
+      const blockFees = await mining.$getHistoricalBlockFees(req.params.interval);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(blockFees);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getHistoricalBlockRewards(req: Request, res: Response) {
+    try {
+      const blockRewards = await mining.$getHistoricalBlockRewards(req.params.interval);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(blockRewards);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getHistoricalBlockFeeRates(req: Request, res: Response) {
+    try {
+      const blockFeeRates = await mining.$getHistoricalBlockFeeRates(req.params.interval);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(blockFeeRates);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getHistoricalBlockSizeAndWeight(req: Request, res: Response) {
+    try {
+      const blockSizes = await mining.$getHistoricalBlockSizes(req.params.interval);
+      const blockWeights = await mining.$getHistoricalBlockWeights(req.params.interval);
+      const blockCount = await BlocksRepository.$blockCount(null, null);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json({
+        sizes: blockSizes,
+        weights: blockWeights
+      });
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getDifficultyAdjustments(req: Request, res: Response) {
+    try {
+      const difficulty = await DifficultyAdjustmentsRepository.$getRawAdjustments(req.params.interval, true);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+      res.json(difficulty.map(adj => [adj.time, adj.height, adj.difficulty, adj.adjustment]));
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  private async $getRewardStats(req: Request, res: Response) {
+    try {
+      const response = await mining.$getRewardStats(parseInt(req.params.blockCount, 10));
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(response);
+    } catch (e) {
+      res.status(500).end();
+    }
+  }
+
+  private async $getHistoricalBlockPrediction(req: Request, res: Response) {
+    try {
+      const blockPredictions = await mining.$getBlockPredictionsHistory(req.params.interval);
+      const blockCount = await BlocksAuditsRepository.$getPredictionsCount();
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.header('X-total-count', blockCount.toString());
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+      res.json(blockPredictions.map(prediction => [prediction.time, prediction.height, prediction.match_rate]));
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+
+  public async $getBlockAudit(req: Request, res: Response) {
+    try {
+      const audit = await BlocksAuditsRepository.$getBlockAudit(req.params.hash);
+      res.header('Pragma', 'public');
+      res.header('Cache-control', 'public');
+      res.setHeader('Expires', new Date(Date.now() + 1000 * 3600 * 24).toUTCString());
+      res.json(audit);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+}
+
+export default new MiningRoutes();

backend/src/api/mining/mining.ts

@@ -0,0 +1,547 @@
+import { BlockPrice, PoolInfo, PoolStats, RewardStats } from '../../mempool.interfaces';
+import BlocksRepository from '../../repositories/BlocksRepository';
+import PoolsRepository from '../../repositories/PoolsRepository';
+import HashratesRepository from '../../repositories/HashratesRepository';
+import bitcoinClient from '../bitcoin/bitcoin-client';
+import logger from '../../logger';
+import { Common } from '../common';
+import loadingIndicators from '../loading-indicators';
+import { escape } from 'mysql2';
+import DifficultyAdjustmentsRepository from '../../repositories/DifficultyAdjustmentsRepository';
+import config from '../../config';
+import BlocksAuditsRepository from '../../repositories/BlocksAuditsRepository';
+import PricesRepository from '../../repositories/PricesRepository';
+
+class Mining {
+  blocksPriceIndexingRunning = false;
+
+  constructor() {
+  }
+
+  /**
+   * Get historical block predictions match rate
+   */
+   public async $getBlockPredictionsHistory(interval: string | null = null): Promise<any> {
+    return await BlocksAuditsRepository.$getBlockPredictionsHistory(
+      this.getTimeRange(interval),
+      Common.getSqlInterval(interval)
+    );
+  }
+
+  /**
+   * Get historical block total fee
+   */
+  public async $getHistoricalBlockFees(interval: string | null = null): Promise<any> {
+    return await BlocksRepository.$getHistoricalBlockFees(
+      this.getTimeRange(interval, 5),
+      Common.getSqlInterval(interval)
+    );
+  }
+
+  /**
+   * Get historical block rewards
+   */
+  public async $getHistoricalBlockRewards(interval: string | null = null): Promise<any> {
+    return await BlocksRepository.$getHistoricalBlockRewards(
+      this.getTimeRange(interval),
+      Common.getSqlInterval(interval)
+    );
+  }
+
+  /**
+   * Get historical block fee rates percentiles
+   */
+   public async $getHistoricalBlockFeeRates(interval: string | null = null): Promise<any> {
+    return await BlocksRepository.$getHistoricalBlockFeeRates(
+      this.getTimeRange(interval),
+      Common.getSqlInterval(interval)
+    );
+  }
+
+  /**
+   * Get historical block sizes
+   */
+   public async $getHistoricalBlockSizes(interval: string | null = null): Promise<any> {
+    return await BlocksRepository.$getHistoricalBlockSizes(
+      this.getTimeRange(interval),
+      Common.getSqlInterval(interval)
+    );
+  }
+
+  /**
+   * Get historical block weights
+   */
+   public async $getHistoricalBlockWeights(interval: string | null = null): Promise<any> {
+    return await BlocksRepository.$getHistoricalBlockWeights(
+      this.getTimeRange(interval),
+      Common.getSqlInterval(interval)
+    );
+  }
+
+  /**
+   * Generate high level overview of the pool ranks and general stats
+   */
+  public async $getPoolsStats(interval: string | null): Promise<object> {
+    const poolsStatistics = {};
+
+    const poolsInfo: PoolInfo[] = await PoolsRepository.$getPoolsInfo(interval);
+    const emptyBlocks: any[] = await BlocksRepository.$countEmptyBlocks(null, interval);
+
+    const poolsStats: PoolStats[] = [];
+    let rank = 1;
+
+    poolsInfo.forEach((poolInfo: PoolInfo) => {
+      const emptyBlocksCount = emptyBlocks.filter((emptyCount) => emptyCount.poolId === poolInfo.poolId);
+      const poolStat: PoolStats = {
+        poolId: poolInfo.poolId, // mysql row id
+        name: poolInfo.name,
+        link: poolInfo.link,
+        blockCount: poolInfo.blockCount,
+        rank: rank++,
+        emptyBlocks: emptyBlocksCount.length > 0 ? emptyBlocksCount[0]['count'] : 0,
+        slug: poolInfo.slug,
+      };
+      poolsStats.push(poolStat);
+    });
+
+    poolsStatistics['pools'] = poolsStats;
+
+    const blockCount: number = await BlocksRepository.$blockCount(null, interval);
+    poolsStatistics['blockCount'] = blockCount;
+
+    const totalBlock24h: number = await BlocksRepository.$blockCount(null, '24h');
+
+    try {
+      poolsStatistics['lastEstimatedHashrate'] = await bitcoinClient.getNetworkHashPs(totalBlock24h);
+    } catch (e) {
+      poolsStatistics['lastEstimatedHashrate'] = 0;
+      logger.debug('Bitcoin Core is not available, using zeroed value for current hashrate');
+    }
+
+    return poolsStatistics;
+  }
+
+  /**
+   * Get all mining pool stats for a pool
+   */
+  public async $getPoolStat(slug: string): Promise<object> {
+    const pool = await PoolsRepository.$getPool(slug);
+    if (!pool) {
+      throw new Error('This mining pool does not exist ' + escape(slug));
+    }
+
+    const blockCount: number = await BlocksRepository.$blockCount(pool.id);
+    const totalBlock: number = await BlocksRepository.$blockCount(null, null);
+
+    const blockCount24h: number = await BlocksRepository.$blockCount(pool.id, '24h');
+    const totalBlock24h: number = await BlocksRepository.$blockCount(null, '24h');
+
+    const blockCount1w: number = await BlocksRepository.$blockCount(pool.id, '1w');
+    const totalBlock1w: number = await BlocksRepository.$blockCount(null, '1w');
+
+    let currentEstimatedHashrate = 0;
+    try {
+      currentEstimatedHashrate = await bitcoinClient.getNetworkHashPs(totalBlock24h);
+    } catch (e) {
+      logger.debug('Bitcoin Core is not available, using zeroed value for current hashrate');
+    }
+
+    return {
+      pool: pool,
+      blockCount: {
+        'all': blockCount,
+        '24h': blockCount24h,
+        '1w': blockCount1w,
+      },
+      blockShare: {
+        'all': blockCount / totalBlock,
+        '24h': blockCount24h / totalBlock24h,
+        '1w': blockCount1w / totalBlock1w,
+      },
+      estimatedHashrate: currentEstimatedHashrate * (blockCount24h / totalBlock24h),
+      reportedHashrate: null,
+    };
+  }
+
+  /**
+   * Get miner reward stats
+   */
+  public async $getRewardStats(blockCount: number): Promise<RewardStats> {
+    return await BlocksRepository.$getBlockStats(blockCount);
+  }
+
+  /**
+   * [INDEXING] Generate weekly mining pool hashrate history
+   */
+  public async $generatePoolHashrateHistory(): Promise<void> {
+    const now = new Date();
+    const lastestRunDate = await HashratesRepository.$getLatestRun('last_weekly_hashrates_indexing');
+
+    // Run only if:
+    // * lastestRunDate is set to 0 (node backend restart, reorg)
+    // * we started a new week (around Monday midnight)
+    const runIndexing = lastestRunDate === 0 || now.getUTCDay() === 1 && lastestRunDate !== now.getUTCDate();
+    if (!runIndexing) {
+      return;
+    }
+
+    try {
+      const oldestConsecutiveBlockTimestamp = 1000 * (await BlocksRepository.$getOldestConsecutiveBlock()).timestamp;
+
+      const genesisBlock = await bitcoinClient.getBlock(await bitcoinClient.getBlockHash(0));
+      const genesisTimestamp = genesisBlock.time * 1000;
+
+      const indexedTimestamp = await HashratesRepository.$getWeeklyHashrateTimestamps();
+      const hashrates: any[] = [];
+ 
+      const lastMonday = new Date(now.setDate(now.getDate() - (now.getDay() + 6) % 7));
+      const lastMondayMidnight = this.getDateMidnight(lastMonday);
+      let toTimestamp = lastMondayMidnight.getTime();
+
+      const totalWeekIndexed = (await BlocksRepository.$blockCount(null, null)) / 1008;
+      let indexedThisRun = 0;
+      let totalIndexed = 0;
+      let newlyIndexed = 0;
+      const startedAt = new Date().getTime() / 1000;
+      let timer = new Date().getTime() / 1000;
+
+      logger.debug(`Indexing weekly mining pool hashrate`);
+      loadingIndicators.setProgress('weekly-hashrate-indexing', 0);
+
+      while (toTimestamp > genesisTimestamp && toTimestamp > oldestConsecutiveBlockTimestamp) {
+        const fromTimestamp = toTimestamp - 604800000;
+
+        // Skip already indexed weeks
+        if (indexedTimestamp.includes(toTimestamp / 1000)) {
+          toTimestamp -= 604800000;
+          ++totalIndexed;
+          continue;
+        }
+
+        const blockStats: any = await BlocksRepository.$blockCountBetweenTimestamp(
+          null, fromTimestamp / 1000, toTimestamp / 1000);
+        const lastBlockHashrate = await bitcoinClient.getNetworkHashPs(blockStats.blockCount,
+          blockStats.lastBlockHeight);
+
+        let pools = await PoolsRepository.$getPoolsInfoBetween(fromTimestamp / 1000, toTimestamp / 1000);
+        const totalBlocks = pools.reduce((acc, pool) => acc + pool.blockCount, 0);
+        if (totalBlocks > 0) {
+          pools = pools.map((pool: any) => {
+            pool.hashrate = (pool.blockCount / totalBlocks) * lastBlockHashrate;
+            pool.share = (pool.blockCount / totalBlocks);
+            return pool;
+          });
+
+          for (const pool of pools) {
+            hashrates.push({
+              hashrateTimestamp: toTimestamp / 1000,
+              avgHashrate: pool['hashrate'] ,
+              poolId: pool.poolId,
+              share: pool['share'],
+              type: 'weekly',
+            });
+          }
+
+          newlyIndexed += hashrates.length;
+          await HashratesRepository.$saveHashrates(hashrates);
+          hashrates.length = 0;
+        }
+
+        const elapsedSeconds = Math.max(1, Math.round((new Date().getTime() / 1000) - timer));
+        if (elapsedSeconds > 1) {
+          const runningFor = Math.max(1, Math.round((new Date().getTime() / 1000) - startedAt));
+          const weeksPerSeconds = Math.max(1, Math.round(indexedThisRun / elapsedSeconds));
+          const progress = Math.round(totalIndexed / totalWeekIndexed * 10000) / 100;
+          const formattedDate = new Date(fromTimestamp).toUTCString();
+          logger.debug(`Getting weekly pool hashrate for ${formattedDate} | ~${weeksPerSeconds.toFixed(2)} weeks/sec | total: ~${totalIndexed}/${Math.round(totalWeekIndexed)} (${progress}%) | elapsed: ${runningFor} seconds`);
+          timer = new Date().getTime() / 1000;
+          indexedThisRun = 0;
+          loadingIndicators.setProgress('weekly-hashrate-indexing', progress, false);
+        }
+
+        toTimestamp -= 604800000;
+        ++indexedThisRun;
+        ++totalIndexed;
+      }
+      await HashratesRepository.$setLatestRun('last_weekly_hashrates_indexing', new Date().getUTCDate());
+      if (newlyIndexed > 0) {
+        logger.notice(`Weekly mining pools hashrates indexing completed: indexed ${newlyIndexed}`);
+      } else {
+        logger.debug(`Weekly mining pools hashrates indexing completed: indexed ${newlyIndexed}`);
+      }
+      loadingIndicators.setProgress('weekly-hashrate-indexing', 100);
+    } catch (e) {
+      loadingIndicators.setProgress('weekly-hashrate-indexing', 100);
+      logger.err(`Weekly mining pools hashrates indexing failed. Trying again in 10 seconds. Reason: ${(e instanceof Error ? e.message : e)}`);
+      throw e;
+    }
+  }
+
+  /**
+   * [INDEXING] Generate daily hashrate data
+   */
+  public async $generateNetworkHashrateHistory(): Promise<void> {
+    // We only run this once a day around midnight
+    const latestRunDate = await HashratesRepository.$getLatestRun('last_hashrates_indexing');
+    const now = new Date().getUTCDate();
+    if (now === latestRunDate) {
+      return;
+    }
+
+    const oldestConsecutiveBlockTimestamp = 1000 * (await BlocksRepository.$getOldestConsecutiveBlock()).timestamp;
+
+    try {
+      const genesisBlock = await bitcoinClient.getBlock(await bitcoinClient.getBlockHash(0));
+      const genesisTimestamp = genesisBlock.time * 1000;
+      const indexedTimestamp = (await HashratesRepository.$getRawNetworkDailyHashrate(null)).map(hashrate => hashrate.timestamp);
+      const lastMidnight = this.getDateMidnight(new Date());
+      let toTimestamp = Math.round(lastMidnight.getTime());
+      const hashrates: any[] = [];
+
+      const totalDayIndexed = (await BlocksRepository.$blockCount(null, null)) / 144;
+      let indexedThisRun = 0;
+      let totalIndexed = 0;
+      let newlyIndexed = 0;
+      const startedAt = new Date().getTime() / 1000;
+      let timer = new Date().getTime() / 1000;
+
+      logger.debug(`Indexing daily network hashrate`);
+      loadingIndicators.setProgress('daily-hashrate-indexing', 0);
+
+      while (toTimestamp > genesisTimestamp && toTimestamp > oldestConsecutiveBlockTimestamp) {
+        const fromTimestamp = toTimestamp - 86400000;
+
+        // Skip already indexed days
+        if (indexedTimestamp.includes(toTimestamp / 1000)) {
+          toTimestamp -= 86400000;
+          ++totalIndexed;
+          continue;
+        }
+
+        const blockStats: any = await BlocksRepository.$blockCountBetweenTimestamp(
+          null, fromTimestamp / 1000, toTimestamp / 1000);
+        const lastBlockHashrate = blockStats.blockCount === 0 ? 0 : await bitcoinClient.getNetworkHashPs(blockStats.blockCount,
+          blockStats.lastBlockHeight);
+
+        hashrates.push({
+          hashrateTimestamp: toTimestamp / 1000,
+          avgHashrate: lastBlockHashrate,
+          poolId: 0,
+          share: 1,
+          type: 'daily',
+        });
+
+        if (hashrates.length > 10) {
+          newlyIndexed += hashrates.length;
+          await HashratesRepository.$saveHashrates(hashrates);
+          hashrates.length = 0;
+        }
+
+        const elapsedSeconds = Math.max(1, Math.round((new Date().getTime() / 1000) - timer));
+        if (elapsedSeconds > 1) {
+          const runningFor = Math.max(1, Math.round((new Date().getTime() / 1000) - startedAt));
+          const daysPerSeconds = Math.max(1, Math.round(indexedThisRun / elapsedSeconds));
+          const progress = Math.round(totalIndexed / totalDayIndexed * 10000) / 100;
+          const formattedDate = new Date(fromTimestamp).toUTCString();
+          logger.debug(`Getting network daily hashrate for ${formattedDate} | ~${daysPerSeconds.toFixed(2)} days/sec | total: ~${totalIndexed}/${Math.round(totalDayIndexed)} (${progress}%) | elapsed: ${runningFor} seconds`);
+          timer = new Date().getTime() / 1000;
+          indexedThisRun = 0;
+          loadingIndicators.setProgress('daily-hashrate-indexing', progress);
+        }
+
+        toTimestamp -= 86400000;
+        ++indexedThisRun;
+        ++totalIndexed;
+      }
+
+      // Add genesis block manually
+      if (config.MEMPOOL.INDEXING_BLOCKS_AMOUNT === -1 && !indexedTimestamp.includes(genesisTimestamp / 1000)) {
+        hashrates.push({
+          hashrateTimestamp: genesisTimestamp / 1000,
+          avgHashrate: await bitcoinClient.getNetworkHashPs(1, 1),
+          poolId: 0,
+          share: 1,
+          type: 'daily',
+        });
+      }
+
+      newlyIndexed += hashrates.length;
+      await HashratesRepository.$saveHashrates(hashrates);
+
+      await HashratesRepository.$setLatestRun('last_hashrates_indexing', new Date().getUTCDate());
+      if (newlyIndexed > 0) {
+        logger.notice(`Daily network hashrate indexing completed: indexed ${newlyIndexed} days`);
+      } else {
+        logger.debug(`Daily network hashrate indexing completed: indexed ${newlyIndexed} days`);
+      }
+      loadingIndicators.setProgress('daily-hashrate-indexing', 100);
+    } catch (e) {
+      loadingIndicators.setProgress('daily-hashrate-indexing', 100);
+      logger.err(`Daily network hashrate indexing failed. Trying again in 10 seconds. Reason: ${(e instanceof Error ? e.message : e)}`);
+      throw e;
+    }
+  }
+
+  /**
+   * Index difficulty adjustments
+   */
+  public async $indexDifficultyAdjustments(): Promise<void> {
+    const indexedHeightsArray = await DifficultyAdjustmentsRepository.$getAdjustmentsHeights();
+    const indexedHeights = {};
+    for (const height of indexedHeightsArray) {
+      indexedHeights[height] = true;
+    }
+
+    const blocks: any = await BlocksRepository.$getBlocksDifficulty();
+    const genesisBlock = await bitcoinClient.getBlock(await bitcoinClient.getBlockHash(0));
+    let currentDifficulty = genesisBlock.difficulty;
+    let totalIndexed = 0;
+
+    if (config.MEMPOOL.INDEXING_BLOCKS_AMOUNT === -1 && indexedHeights[0] !== true) {
+      await DifficultyAdjustmentsRepository.$saveAdjustments({
+        time: genesisBlock.time,
+        height: 0,
+        difficulty: currentDifficulty,
+        adjustment: 0.0,
+      });
+    }
+
+    const oldestConsecutiveBlock = await BlocksRepository.$getOldestConsecutiveBlock();
+    if (config.MEMPOOL.INDEXING_BLOCKS_AMOUNT !== -1) {
+      currentDifficulty = oldestConsecutiveBlock.difficulty;
+    }
+
+    let totalBlockChecked = 0;
+    let timer = new Date().getTime() / 1000;
+
+    for (const block of blocks) {
+      if (block.difficulty !== currentDifficulty) {
+        if (indexedHeights[block.height] === true) { // Already indexed
+          if (block.height >= oldestConsecutiveBlock.height) {
+            currentDifficulty = block.difficulty;
+          }
+          continue;          
+        }
+
+        let adjustment = block.difficulty / currentDifficulty;
+        adjustment = Math.round(adjustment * 1000000) / 1000000; // Remove float point noise
+
+        await DifficultyAdjustmentsRepository.$saveAdjustments({
+          time: block.time,
+          height: block.height,
+          difficulty: block.difficulty,
+          adjustment: adjustment,
+        });
+
+        totalIndexed++;
+        if (block.height >= oldestConsecutiveBlock.height) {
+          currentDifficulty = block.difficulty;
+        }
+    }
+
+      totalBlockChecked++;
+      const elapsedSeconds = Math.max(1, Math.round((new Date().getTime() / 1000) - timer));
+      if (elapsedSeconds > 5) {
+        const progress = Math.round(totalBlockChecked / blocks.length * 100);
+        logger.info(`Indexing difficulty adjustment at block #${block.height} | Progress: ${progress}%`);
+        timer = new Date().getTime() / 1000;
+      }
+    }
+
+    if (totalIndexed > 0) {
+      logger.notice(`Indexed ${totalIndexed} difficulty adjustments`);
+    } else {
+      logger.debug(`Indexed ${totalIndexed} difficulty adjustments`);
+    }
+  }
+
+  /**
+   * Create a link between blocks and the latest price at when they were mined
+   */
+  public async $indexBlockPrices() {
+    if (this.blocksPriceIndexingRunning === true) {
+      return;
+    }
+    this.blocksPriceIndexingRunning = true;
+
+    try {
+      const prices: any[] = await PricesRepository.$getPricesTimesAndId();    
+      const blocksWithoutPrices: any[] = await BlocksRepository.$getBlocksWithoutPrice();
+
+      let totalInserted = 0;
+      const blocksPrices: BlockPrice[] = [];
+
+      for (const block of blocksWithoutPrices) {
+        // Quick optimisation, out mtgox feed only goes back to 2010-07-19 02:00:00, so skip the first 68951 blocks
+        if (block.height < 68951) {
+          blocksPrices.push({
+            height: block.height,
+            priceId: prices[0].id,
+          });
+          continue;
+        }
+        for (const price of prices) {
+          if (block.timestamp < price.time) {
+            blocksPrices.push({
+              height: block.height,
+              priceId: price.id,
+            });
+            break;
+          };
+        }
+
+        if (blocksPrices.length >= 100000) {
+          totalInserted += blocksPrices.length;
+          if (blocksWithoutPrices.length > 200000) {
+            logger.debug(`Linking ${blocksPrices.length} newly indexed blocks to their closest price | Progress ${Math.round(totalInserted / blocksWithoutPrices.length * 100)}%`);
+          } else {
+            logger.debug(`Linking ${blocksPrices.length} newly indexed blocks to their closest price`);
+          }
+          await BlocksRepository.$saveBlockPrices(blocksPrices);
+          blocksPrices.length = 0;
+        }
+      }
+
+      if (blocksPrices.length > 0) {
+        totalInserted += blocksPrices.length;
+        if (blocksWithoutPrices.length > 200000) {
+          logger.debug(`Linking ${blocksPrices.length} newly indexed blocks to their closest price | Progress ${Math.round(totalInserted / blocksWithoutPrices.length * 100)}%`);
+        } else {
+          logger.debug(`Linking ${blocksPrices.length} newly indexed blocks to their closest price`);
+        }
+        await BlocksRepository.$saveBlockPrices(blocksPrices);
+      }
+    } catch (e) {
+      this.blocksPriceIndexingRunning = false;
+      throw e;
+    }
+
+    this.blocksPriceIndexingRunning = false;
+  }
+
+  private getDateMidnight(date: Date): Date {
+    date.setUTCHours(0);
+    date.setUTCMinutes(0);
+    date.setUTCSeconds(0);
+    date.setUTCMilliseconds(0);
+
+    return date;
+  }
+
+  private getTimeRange(interval: string | null, scale = 1): number {
+    switch (interval) {
+      case '3y': return 43200 * scale; // 12h
+      case '2y': return 28800 * scale; // 8h
+      case '1y': return 28800 * scale; // 8h
+      case '6m': return 10800 * scale; // 3h
+      case '3m': return 7200 * scale; // 2h
+      case '1m': return 1800 * scale; // 30min
+      case '1w': return 300 * scale; // 5min
+      case '3d': return 1 * scale;
+      case '24h': return 1 * scale;
+      default: return 86400 * scale;
+    }
+  }
+}
+
+export default new Mining();

backend/src/api/pools-parser.ts

@@ -0,0 +1,252 @@
+import DB from '../database';
+import logger from '../logger';
+import config from '../config';
+import BlocksRepository from '../repositories/BlocksRepository';
+
+interface Pool {
+  name: string;
+  link: string;
+  regexes: string[];
+  addresses: string[];
+  slug: string;
+}
+
+class PoolsParser {
+  miningPools: any[] = [];
+  unknownPool: any = {
+    'name': "Unknown",
+    'link': "https://learnmeabitcoin.com/technical/coinbase-transaction",
+    'regexes': "[]",
+    'addresses': "[]",
+    'slug': 'unknown'
+  };
+  slugWarnFlag = false;
+
+  /**
+   * Parse the pools.json file, consolidate the data and dump it into the database
+   */
+  public async migratePoolsJson(poolsJson: object) {
+    if (['mainnet', 'testnet', 'signet'].includes(config.MEMPOOL.NETWORK) === false) {
+      return;
+    }
+
+    // First we save every entries without paying attention to pool duplication
+    const poolsDuplicated: Pool[] = [];
+
+    const coinbaseTags = Object.entries(poolsJson['coinbase_tags']);
+    for (let i = 0; i < coinbaseTags.length; ++i) {
+      poolsDuplicated.push({
+        'name': (<Pool>coinbaseTags[i][1]).name,
+        'link': (<Pool>coinbaseTags[i][1]).link,
+        'regexes': [coinbaseTags[i][0]],
+        'addresses': [],
+        'slug': ''
+      });
+    }
+    const addressesTags = Object.entries(poolsJson['payout_addresses']);
+    for (let i = 0; i < addressesTags.length; ++i) {
+      poolsDuplicated.push({
+        'name': (<Pool>addressesTags[i][1]).name,
+        'link': (<Pool>addressesTags[i][1]).link,
+        'regexes': [],
+        'addresses': [addressesTags[i][0]],
+        'slug': ''
+      });
+    }
+
+    // Then, we find unique mining pool names
+    const poolNames: string[] = [];
+    for (let i = 0; i < poolsDuplicated.length; ++i) {
+      if (poolNames.indexOf(poolsDuplicated[i].name) === -1) {
+        poolNames.push(poolsDuplicated[i].name);
+      }
+    }
+    logger.debug(`Found ${poolNames.length} unique mining pools`);
+
+    // Get existing pools from the db
+    let existingPools;
+    try {
+      if (config.DATABASE.ENABLED === true) {
+        [existingPools] = await DB.query({ sql: 'SELECT * FROM pools;', timeout: 120000 });
+      } else {
+        existingPools = [];
+      }
+    } catch (e) {
+      logger.err('Cannot get existing pools from the database, skipping pools.json import');
+      return;
+    }
+
+    this.miningPools = [];
+
+    // Finally, we generate the final consolidated pools data
+    const finalPoolDataAdd: Pool[] = [];
+    const finalPoolDataUpdate: Pool[] = [];
+    for (let i = 0; i < poolNames.length; ++i) {
+      let allAddresses: string[] = [];
+      let allRegexes: string[] = [];
+      const match = poolsDuplicated.filter((pool: Pool) => pool.name === poolNames[i]);
+
+      for (let y = 0; y < match.length; ++y) {
+        allAddresses = allAddresses.concat(match[y].addresses);
+        allRegexes = allRegexes.concat(match[y].regexes);
+      }
+
+      const finalPoolName = poolNames[i].replace(`'`, `''`); // To support single quote in names when doing db queries
+
+      let slug: string | undefined;
+      try {
+        slug = poolsJson['slugs'][poolNames[i]];
+      } catch (e) {
+        if (this.slugWarnFlag === false) {
+          logger.warn(`pools.json does not seem to contain the 'slugs' object`);
+          this.slugWarnFlag = true;
+        }
+      }
+
+      if (slug === undefined) {
+        // Only keep alphanumerical
+        slug = poolNames[i].replace(/[^a-z0-9]/gi, '').toLowerCase();
+        logger.warn(`No slug found for '${poolNames[i]}', generating it => '${slug}'`);
+      }
+
+      const poolObj = {
+        'name': finalPoolName,
+        'link': match[0].link,
+        'regexes': allRegexes,
+        'addresses': allAddresses,
+        'slug': slug
+      };
+
+      const existingPool = existingPools.find((pool) => pool.name === poolNames[i]);
+      if (existingPool !== undefined) {
+        // Check if any data was actually updated
+        const equals = (a, b) =>
+          a.length === b.length &&
+          a.every((v, i) => v === b[i]);
+        if (!equals(JSON.parse(existingPool.addresses), poolObj.addresses) || !equals(JSON.parse(existingPool.regexes), poolObj.regexes)) {
+          finalPoolDataUpdate.push(poolObj);
+        }
+      } else {
+        logger.debug(`Add '${finalPoolName}' mining pool`);
+        finalPoolDataAdd.push(poolObj);
+      }
+
+      this.miningPools.push({
+        'name': finalPoolName,
+        'link': match[0].link,
+        'regexes': JSON.stringify(allRegexes),
+        'addresses': JSON.stringify(allAddresses),
+        'slug': slug
+      });
+    }
+
+    if (config.DATABASE.ENABLED === false) { // Don't run db operations
+      logger.info('Mining pools.json import completed (no database)');
+      return;
+    }
+
+    if (finalPoolDataAdd.length > 0 || finalPoolDataUpdate.length > 0) {    
+      logger.debug(`Update pools table now`);
+
+      // Add new mining pools into the database
+      let queryAdd: string = 'INSERT INTO pools(name, link, regexes, addresses, slug) VALUES ';
+      for (let i = 0; i < finalPoolDataAdd.length; ++i) {
+        queryAdd += `('${finalPoolDataAdd[i].name}', '${finalPoolDataAdd[i].link}',
+        '${JSON.stringify(finalPoolDataAdd[i].regexes)}', '${JSON.stringify(finalPoolDataAdd[i].addresses)}',
+        ${JSON.stringify(finalPoolDataAdd[i].slug)}),`;
+      }
+      queryAdd = queryAdd.slice(0, -1) + ';';
+
+      // Updated existing mining pools in the database
+      const updateQueries: string[] = [];
+      for (let i = 0; i < finalPoolDataUpdate.length; ++i) {
+        updateQueries.push(`
+          UPDATE pools
+          SET name='${finalPoolDataUpdate[i].name}', link='${finalPoolDataUpdate[i].link}',
+          regexes='${JSON.stringify(finalPoolDataUpdate[i].regexes)}', addresses='${JSON.stringify(finalPoolDataUpdate[i].addresses)}',
+          slug='${finalPoolDataUpdate[i].slug}'
+          WHERE name='${finalPoolDataUpdate[i].name}'
+        ;`);
+      }
+
+      try {
+        await this.$deleteBlocskToReindex(finalPoolDataUpdate);
+
+        if (finalPoolDataAdd.length > 0) {
+          await DB.query({ sql: queryAdd, timeout: 120000 });
+        }
+        for (const query of updateQueries) {
+          await DB.query({ sql: query, timeout: 120000 });
+        }
+        await this.insertUnknownPool();
+        logger.info('Mining pools.json import completed');
+      } catch (e) {
+        logger.err(`Cannot import pools in the database`);
+        throw e;
+      }
+    }
+
+    try {
+      await this.insertUnknownPool();
+    } catch (e) {
+      logger.err(`Cannot insert unknown pool in the database`);
+      throw e;
+    }
+  }
+
+  /**
+   * Manually add the 'unknown pool'
+   */
+  private async insertUnknownPool() {
+    try {
+      const [rows]: any[] = await DB.query({ sql: 'SELECT name from pools where name="Unknown"', timeout: 120000 });
+      if (rows.length === 0) {
+        await DB.query({
+          sql: `INSERT INTO pools(name, link, regexes, addresses, slug)
+          VALUES("Unknown", "https://learnmeabitcoin.com/technical/coinbase-transaction", "[]", "[]", "unknown");
+        `});
+      } else {
+        await DB.query(`UPDATE pools
+          SET name='Unknown', link='https://learnmeabitcoin.com/technical/coinbase-transaction',
+          regexes='[]', addresses='[]',
+          slug='unknown'
+          WHERE name='Unknown'
+        `);
+      }
+    } catch (e) {
+      logger.err('Unable to insert "Unknown" mining pool');
+    }
+  }
+
+  /**
+   * Delete blocks which needs to be reindexed
+   */
+   private async $deleteBlocskToReindex(finalPoolDataUpdate: any[]) {
+    if (config.MEMPOOL.AUTOMATIC_BLOCK_REINDEXING === false) {
+      return;
+    }
+
+    const blockCount = await BlocksRepository.$blockCount(null, null);
+    if (blockCount === 0) {
+      return;
+    }
+
+    for (const updatedPool of finalPoolDataUpdate) {
+      const [pool]: any[] = await DB.query(`SELECT id, name from pools where slug = "${updatedPool.slug}"`);
+      if (pool.length > 0) {
+        logger.notice(`Deleting blocks from ${pool[0].name} mining pool for future re-indexing`);
+        await DB.query(`DELETE FROM blocks WHERE pool_id = ${pool[0].id}`);
+      }
+    }
+
+    // Ignore early days of Bitcoin as there were not mining pool yet
+    logger.notice('Deleting blocks with unknown mining pool from height 130635 for future re-indexing');
+    const [unknownPool] = await DB.query(`SELECT id from pools where slug = "unknown"`);
+    await DB.query(`DELETE FROM blocks WHERE pool_id = ${unknownPool[0].id} AND height > 130635`);
+
+    logger.notice('Truncating hashrates for future re-indexing');
+    await DB.query(`DELETE FROM hashrates`);
+  }
+}
+
+export default new PoolsParser();

backend/src/api/rbf-cache.ts

@@ -0,0 +1,34 @@
+export interface CachedRbf {
+  txid: string;
+  expires: Date;
+}
+
+class RbfCache {
+  private cache: { [txid: string]: CachedRbf; } = {};
+
+  constructor() {
+    setInterval(this.cleanup.bind(this), 1000 * 60 * 60);
+  }
+
+  public add(replacedTxId: string, newTxId: string): void {
+    this.cache[replacedTxId] = {
+      expires: new Date(Date.now() + 1000 * 604800), // 1 week
+      txid: newTxId,
+    };
+  }
+
+  public get(txId: string): CachedRbf | undefined {
+    return this.cache[txId];
+  }
+
+  private cleanup(): void {
+    const currentDate = new Date();
+    for (const c in this.cache) {
+      if (this.cache[c].expires < currentDate) {
+        delete this.cache[c];
+      }
+    }
+  }
+}
+
+export default new RbfCache();

backend/src/api/statistics.ts

@@ -1,445 +0,0 @@
-import memPool from './mempool';
-import { DB } from '../database';
-import logger from '../logger';
-
-import { Statistic, TransactionExtended, OptimizedStatistic } from '../mempool.interfaces';
-
-class Statistics {
-  protected intervalTimer: NodeJS.Timer | undefined;
-  protected newStatisticsEntryCallback: ((stats: OptimizedStatistic) => void) | undefined;
-
-  public setNewStatisticsEntryCallback(fn: (stats: OptimizedStatistic) => void) {
-    this.newStatisticsEntryCallback = fn;
-  }
-
-  constructor() { }
-
-  public startStatistics(): void {
-    logger.info('Starting statistics service');
-
-    const now = new Date();
-    const nextInterval = new Date(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(),
-      Math.floor(now.getMinutes() / 1) * 1 + 1, 0, 0);
-    const difference = nextInterval.getTime() - now.getTime();
-
-    setTimeout(() => {
-      this.runStatistics();
-      this.intervalTimer = setInterval(() => {
-        this.runStatistics();
-      }, 1 * 60 * 1000);
-    }, difference);
-  }
-
-  private async runStatistics(): Promise<void> {
-    if (!memPool.isInSync()) {
-      return;
-    }
-    const currentMempool = memPool.getMempool();
-    const txPerSecond = memPool.getTxPerSecond();
-    const vBytesPerSecond = memPool.getVBytesPerSecond();
-
-    logger.debug('Running statistics');
-
-    let memPoolArray: TransactionExtended[] = [];
-    for (const i in currentMempool) {
-      if (currentMempool.hasOwnProperty(i)) {
-        memPoolArray.push(currentMempool[i]);
-      }
-    }
-    // Remove 0 and undefined
-    memPoolArray = memPoolArray.filter((tx) => tx.feePerVsize);
-
-    if (!memPoolArray.length) {
-      return;
-    }
-
-    memPoolArray.sort((a, b) => a.feePerVsize - b.feePerVsize);
-    const totalWeight = memPoolArray.map((tx) => tx.vsize).reduce((acc, curr) => acc + curr) * 4;
-    const totalFee = memPoolArray.map((tx) => tx.fee).reduce((acc, curr) => acc + curr);
-
-    const logFees = [1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200,
-      250, 300, 350, 400, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000];
-
-    const weightVsizeFees: { [feePerWU: number]: number } = {};
-
-    memPoolArray.forEach((transaction) => {
-      for (let i = 0; i < logFees.length; i++) {
-        if ((logFees[i] === 2000 && transaction.feePerVsize >= 2000) || transaction.feePerVsize <= logFees[i]) {
-          if (weightVsizeFees[logFees[i]]) {
-            weightVsizeFees[logFees[i]] += transaction.vsize;
-          } else {
-            weightVsizeFees[logFees[i]] = transaction.vsize;
-          }
-          break;
-        }
-      }
-    });
-
-    const insertId = await this.$create({
-      added: 'NOW()',
-      unconfirmed_transactions: memPoolArray.length,
-      tx_per_second: txPerSecond,
-      vbytes_per_second: Math.round(vBytesPerSecond),
-      mempool_byte_weight: totalWeight,
-      total_fee: totalFee,
-      fee_data: '',
-      vsize_1: weightVsizeFees['1'] || 0,
-      vsize_2: weightVsizeFees['2'] || 0,
-      vsize_3: weightVsizeFees['3'] || 0,
-      vsize_4: weightVsizeFees['4'] || 0,
-      vsize_5: weightVsizeFees['5'] || 0,
-      vsize_6: weightVsizeFees['6'] || 0,
-      vsize_8: weightVsizeFees['8'] || 0,
-      vsize_10: weightVsizeFees['10'] || 0,
-      vsize_12: weightVsizeFees['12'] || 0,
-      vsize_15: weightVsizeFees['15'] || 0,
-      vsize_20: weightVsizeFees['20'] || 0,
-      vsize_30: weightVsizeFees['30'] || 0,
-      vsize_40: weightVsizeFees['40'] || 0,
-      vsize_50: weightVsizeFees['50'] || 0,
-      vsize_60: weightVsizeFees['60'] || 0,
-      vsize_70: weightVsizeFees['70'] || 0,
-      vsize_80: weightVsizeFees['80'] || 0,
-      vsize_90: weightVsizeFees['90'] || 0,
-      vsize_100: weightVsizeFees['100'] || 0,
-      vsize_125: weightVsizeFees['125'] || 0,
-      vsize_150: weightVsizeFees['150'] || 0,
-      vsize_175: weightVsizeFees['175'] || 0,
-      vsize_200: weightVsizeFees['200'] || 0,
-      vsize_250: weightVsizeFees['250'] || 0,
-      vsize_300: weightVsizeFees['300'] || 0,
-      vsize_350: weightVsizeFees['350'] || 0,
-      vsize_400: weightVsizeFees['400'] || 0,
-      vsize_500: weightVsizeFees['500'] || 0,
-      vsize_600: weightVsizeFees['600'] || 0,
-      vsize_700: weightVsizeFees['700'] || 0,
-      vsize_800: weightVsizeFees['800'] || 0,
-      vsize_900: weightVsizeFees['900'] || 0,
-      vsize_1000: weightVsizeFees['1000'] || 0,
-      vsize_1200: weightVsizeFees['1200'] || 0,
-      vsize_1400: weightVsizeFees['1400'] || 0,
-      vsize_1600: weightVsizeFees['1600'] || 0,
-      vsize_1800: weightVsizeFees['1800'] || 0,
-      vsize_2000: weightVsizeFees['2000'] || 0,
-    });
-
-    if (this.newStatisticsEntryCallback && insertId) {
-      const newStats = await this.$get(insertId);
-      if (newStats) {
-        this.newStatisticsEntryCallback(newStats);
-      }
-    }
-  }
-
-  private async $create(statistics: Statistic): Promise<number | undefined> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `INSERT INTO statistics(
-              added,
-              unconfirmed_transactions,
-              tx_per_second,
-              vbytes_per_second,
-              mempool_byte_weight,
-              fee_data,
-              total_fee,
-              vsize_1,
-              vsize_2,
-              vsize_3,
-              vsize_4,
-              vsize_5,
-              vsize_6,
-              vsize_8,
-              vsize_10,
-              vsize_12,
-              vsize_15,
-              vsize_20,
-              vsize_30,
-              vsize_40,
-              vsize_50,
-              vsize_60,
-              vsize_70,
-              vsize_80,
-              vsize_90,
-              vsize_100,
-              vsize_125,
-              vsize_150,
-              vsize_175,
-              vsize_200,
-              vsize_250,
-              vsize_300,
-              vsize_350,
-              vsize_400,
-              vsize_500,
-              vsize_600,
-              vsize_700,
-              vsize_800,
-              vsize_900,
-              vsize_1000,
-              vsize_1200,
-              vsize_1400,
-              vsize_1600,
-              vsize_1800,
-              vsize_2000
-            )
-            VALUES (${statistics.added}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,
-               ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`;
-
-      const params: (string | number)[] = [
-        statistics.unconfirmed_transactions,
-        statistics.tx_per_second,
-        statistics.vbytes_per_second,
-        statistics.mempool_byte_weight,
-        statistics.fee_data,
-        statistics.total_fee,
-        statistics.vsize_1,
-        statistics.vsize_2,
-        statistics.vsize_3,
-        statistics.vsize_4,
-        statistics.vsize_5,
-        statistics.vsize_6,
-        statistics.vsize_8,
-        statistics.vsize_10,
-        statistics.vsize_12,
-        statistics.vsize_15,
-        statistics.vsize_20,
-        statistics.vsize_30,
-        statistics.vsize_40,
-        statistics.vsize_50,
-        statistics.vsize_60,
-        statistics.vsize_70,
-        statistics.vsize_80,
-        statistics.vsize_90,
-        statistics.vsize_100,
-        statistics.vsize_125,
-        statistics.vsize_150,
-        statistics.vsize_175,
-        statistics.vsize_200,
-        statistics.vsize_250,
-        statistics.vsize_300,
-        statistics.vsize_350,
-        statistics.vsize_400,
-        statistics.vsize_500,
-        statistics.vsize_600,
-        statistics.vsize_700,
-        statistics.vsize_800,
-        statistics.vsize_900,
-        statistics.vsize_1000,
-        statistics.vsize_1200,
-        statistics.vsize_1400,
-        statistics.vsize_1600,
-        statistics.vsize_1800,
-        statistics.vsize_2000,
-      ];
-      const [result]: any = await connection.query(query, params);
-      connection.release();
-      return result.insertId;
-    } catch (e) {
-      logger.err('$create() error' + e.message || e);
-    }
-  }
-
-  private getQueryForDays(div: number) {
-    return `SELECT id, added, unconfirmed_transactions,
-      tx_per_second,
-      vbytes_per_second,
-      vsize_1,
-      vsize_2,
-      vsize_3,
-      vsize_4,
-      vsize_5,
-      vsize_6,
-      vsize_8,
-      vsize_10,
-      vsize_12,
-      vsize_15,
-      vsize_20,
-      vsize_30,
-      vsize_40,
-      vsize_50,
-      vsize_60,
-      vsize_70,
-      vsize_80,
-      vsize_90,
-      vsize_100,
-      vsize_125,
-      vsize_150,
-      vsize_175,
-      vsize_200,
-      vsize_250,
-      vsize_300,
-      vsize_350,
-      vsize_400,
-      vsize_500,
-      vsize_600,
-      vsize_700,
-      vsize_800,
-      vsize_900,
-      vsize_1000,
-      vsize_1200,
-      vsize_1400,
-      vsize_1600,
-      vsize_1800,
-      vsize_2000 FROM statistics GROUP BY UNIX_TIMESTAMP(added) DIV ${div} ORDER BY id DESC LIMIT 480`;
-  }
-
-  public async $get(id: number): Promise<OptimizedStatistic | undefined> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `SELECT * FROM statistics WHERE id = ?`;
-      const [rows] = await connection.query<any>(query, [id]);
-      connection.release();
-      if (rows[0]) {
-        return this.mapStatisticToOptimizedStatistic([rows[0]])[0];
-      }
-    } catch (e) {
-      logger.err('$list2H() error' + e.message || e);
-    }
-  }
-
-  public async $list2H(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = `SELECT * FROM statistics ORDER BY id DESC LIMIT 120`;
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list2H() error' + e.message || e);
-      return [];
-    }
-  }
-
-  public async $list24H(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = this.getQueryForDays(180);
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list24h() error' + e.message || e);
-      return [];
-    }
-  }
-
-  public async $list1W(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = this.getQueryForDays(1260);
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list1W() error' + e);
-      return [];
-    }
-  }
-
-  public async $list1M(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = this.getQueryForDays(5040);
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list1M() error' + e);
-      return [];
-    }
-  }
-
-  public async $list3M(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = this.getQueryForDays(15120);
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list3M() error' + e);
-      return [];
-    }
-  }
-
-  public async $list6M(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = this.getQueryForDays(30240);
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list6M() error' + e);
-      return [];
-    }
-  }
-
-  public async $list1Y(): Promise<OptimizedStatistic[]> {
-    try {
-      const connection = await DB.pool.getConnection();
-      const query = this.getQueryForDays(60480);
-      const [rows] = await connection.query<any>(query);
-      connection.release();
-      return this.mapStatisticToOptimizedStatistic(rows);
-    } catch (e) {
-      logger.err('$list6M() error' + e);
-      return [];
-    }
-  }
-  private mapStatisticToOptimizedStatistic(statistic: Statistic[]): OptimizedStatistic[] {
-    return statistic.map((s) => {
-      return {
-        id: s.id || 0,
-        added: s.added,
-        unconfirmed_transactions: s.unconfirmed_transactions,
-        tx_per_second: s.tx_per_second,
-        vbytes_per_second: s.vbytes_per_second,
-        mempool_byte_weight: s.mempool_byte_weight,
-        total_fee: s.total_fee,
-        vsizes: [
-          s.vsize_1,
-          s.vsize_2,
-          s.vsize_3,
-          s.vsize_4,
-          s.vsize_5,
-          s.vsize_6,
-          s.vsize_8,
-          s.vsize_10,
-          s.vsize_12,
-          s.vsize_15,
-          s.vsize_20,
-          s.vsize_30,
-          s.vsize_40,
-          s.vsize_50,
-          s.vsize_60,
-          s.vsize_70,
-          s.vsize_80,
-          s.vsize_90,
-          s.vsize_100,
-          s.vsize_125,
-          s.vsize_150,
-          s.vsize_175,
-          s.vsize_200,
-          s.vsize_250,
-          s.vsize_300,
-          s.vsize_350,
-          s.vsize_400,
-          s.vsize_500,
-          s.vsize_600,
-          s.vsize_700,
-          s.vsize_800,
-          s.vsize_900,
-          s.vsize_1000,
-          s.vsize_1200,
-          s.vsize_1400,
-          s.vsize_1600,
-          s.vsize_1800,
-          s.vsize_2000,
-        ]
-      };
-    });
-  }
-
-}
-
-export default new Statistics();

backend/src/api/statistics/statistics-api.ts

@@ -0,0 +1,430 @@
+import DB from '../../database';
+import logger from '../../logger';
+import { Statistic, OptimizedStatistic } from '../../mempool.interfaces';
+
+class StatisticsApi {
+  protected queryTimeout = 120000;
+
+  public async $createZeroedStatistic(): Promise<number | undefined> {
+    try {
+      const query = `INSERT INTO statistics(
+              added,
+              unconfirmed_transactions,
+              tx_per_second,
+              vbytes_per_second,
+              mempool_byte_weight,
+              fee_data,
+              total_fee,
+              vsize_1,
+              vsize_2,
+              vsize_3,
+              vsize_4,
+              vsize_5,
+              vsize_6,
+              vsize_8,
+              vsize_10,
+              vsize_12,
+              vsize_15,
+              vsize_20,
+              vsize_30,
+              vsize_40,
+              vsize_50,
+              vsize_60,
+              vsize_70,
+              vsize_80,
+              vsize_90,
+              vsize_100,
+              vsize_125,
+              vsize_150,
+              vsize_175,
+              vsize_200,
+              vsize_250,
+              vsize_300,
+              vsize_350,
+              vsize_400,
+              vsize_500,
+              vsize_600,
+              vsize_700,
+              vsize_800,
+              vsize_900,
+              vsize_1000,
+              vsize_1200,
+              vsize_1400,
+              vsize_1600,
+              vsize_1800,
+              vsize_2000
+            )
+            VALUES (NOW(), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+               0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)`;
+      const [result]: any = await DB.query(query);
+      return result.insertId;
+    } catch (e) {
+      logger.err('$create() error' + (e instanceof Error ? e.message : e));
+    }
+  }
+
+  public async $create(statistics: Statistic): Promise<number | undefined> {
+    try {
+      const query = `INSERT INTO statistics(
+              added,
+              unconfirmed_transactions,
+              tx_per_second,
+              vbytes_per_second,
+              mempool_byte_weight,
+              fee_data,
+              total_fee,
+              vsize_1,
+              vsize_2,
+              vsize_3,
+              vsize_4,
+              vsize_5,
+              vsize_6,
+              vsize_8,
+              vsize_10,
+              vsize_12,
+              vsize_15,
+              vsize_20,
+              vsize_30,
+              vsize_40,
+              vsize_50,
+              vsize_60,
+              vsize_70,
+              vsize_80,
+              vsize_90,
+              vsize_100,
+              vsize_125,
+              vsize_150,
+              vsize_175,
+              vsize_200,
+              vsize_250,
+              vsize_300,
+              vsize_350,
+              vsize_400,
+              vsize_500,
+              vsize_600,
+              vsize_700,
+              vsize_800,
+              vsize_900,
+              vsize_1000,
+              vsize_1200,
+              vsize_1400,
+              vsize_1600,
+              vsize_1800,
+              vsize_2000
+            )
+            VALUES (${statistics.added}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,
+               ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`;
+
+      const params: (string | number)[] = [
+        statistics.unconfirmed_transactions,
+        statistics.tx_per_second,
+        statistics.vbytes_per_second,
+        statistics.mempool_byte_weight,
+        statistics.fee_data,
+        statistics.total_fee,
+        statistics.vsize_1,
+        statistics.vsize_2,
+        statistics.vsize_3,
+        statistics.vsize_4,
+        statistics.vsize_5,
+        statistics.vsize_6,
+        statistics.vsize_8,
+        statistics.vsize_10,
+        statistics.vsize_12,
+        statistics.vsize_15,
+        statistics.vsize_20,
+        statistics.vsize_30,
+        statistics.vsize_40,
+        statistics.vsize_50,
+        statistics.vsize_60,
+        statistics.vsize_70,
+        statistics.vsize_80,
+        statistics.vsize_90,
+        statistics.vsize_100,
+        statistics.vsize_125,
+        statistics.vsize_150,
+        statistics.vsize_175,
+        statistics.vsize_200,
+        statistics.vsize_250,
+        statistics.vsize_300,
+        statistics.vsize_350,
+        statistics.vsize_400,
+        statistics.vsize_500,
+        statistics.vsize_600,
+        statistics.vsize_700,
+        statistics.vsize_800,
+        statistics.vsize_900,
+        statistics.vsize_1000,
+        statistics.vsize_1200,
+        statistics.vsize_1400,
+        statistics.vsize_1600,
+        statistics.vsize_1800,
+        statistics.vsize_2000,
+      ];
+      const [result]: any = await DB.query(query, params);
+      return result.insertId;
+    } catch (e) {
+      logger.err('$create() error' + (e instanceof Error ? e.message : e));
+    }
+  }
+
+  private getQueryForDaysAvg(div: number, interval: string) {
+    return `SELECT
+      UNIX_TIMESTAMP(added) as added,
+      CAST(avg(vbytes_per_second) as DOUBLE) as vbytes_per_second,
+      CAST(avg(vsize_1) as DOUBLE) as vsize_1,
+      CAST(avg(vsize_2) as DOUBLE) as vsize_2,
+      CAST(avg(vsize_3) as DOUBLE) as vsize_3,
+      CAST(avg(vsize_4) as DOUBLE) as vsize_4,
+      CAST(avg(vsize_5) as DOUBLE) as vsize_5,
+      CAST(avg(vsize_6) as DOUBLE) as vsize_6,
+      CAST(avg(vsize_8) as DOUBLE) as vsize_8,
+      CAST(avg(vsize_10) as DOUBLE) as vsize_10,
+      CAST(avg(vsize_12) as DOUBLE) as vsize_12,
+      CAST(avg(vsize_15) as DOUBLE) as vsize_15,
+      CAST(avg(vsize_20) as DOUBLE) as vsize_20,
+      CAST(avg(vsize_30) as DOUBLE) as vsize_30,
+      CAST(avg(vsize_40) as DOUBLE) as vsize_40,
+      CAST(avg(vsize_50) as DOUBLE) as vsize_50,
+      CAST(avg(vsize_60) as DOUBLE) as vsize_60,
+      CAST(avg(vsize_70) as DOUBLE) as vsize_70,
+      CAST(avg(vsize_80) as DOUBLE) as vsize_80,
+      CAST(avg(vsize_90) as DOUBLE) as vsize_90,
+      CAST(avg(vsize_100) as DOUBLE) as vsize_100,
+      CAST(avg(vsize_125) as DOUBLE) as vsize_125,
+      CAST(avg(vsize_150) as DOUBLE) as vsize_150,
+      CAST(avg(vsize_175) as DOUBLE) as vsize_175,
+      CAST(avg(vsize_200) as DOUBLE) as vsize_200,
+      CAST(avg(vsize_250) as DOUBLE) as vsize_250,
+      CAST(avg(vsize_300) as DOUBLE) as vsize_300,
+      CAST(avg(vsize_350) as DOUBLE) as vsize_350,
+      CAST(avg(vsize_400) as DOUBLE) as vsize_400,
+      CAST(avg(vsize_500) as DOUBLE) as vsize_500,
+      CAST(avg(vsize_600) as DOUBLE) as vsize_600,
+      CAST(avg(vsize_700) as DOUBLE) as vsize_700,
+      CAST(avg(vsize_800) as DOUBLE) as vsize_800,
+      CAST(avg(vsize_900) as DOUBLE) as vsize_900,
+      CAST(avg(vsize_1000) as DOUBLE) as vsize_1000,
+      CAST(avg(vsize_1200) as DOUBLE) as vsize_1200,
+      CAST(avg(vsize_1400) as DOUBLE) as vsize_1400,
+      CAST(avg(vsize_1600) as DOUBLE) as vsize_1600,
+      CAST(avg(vsize_1800) as DOUBLE) as vsize_1800,
+      CAST(avg(vsize_2000) as DOUBLE) as vsize_2000 \
+      FROM statistics \
+      WHERE added BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW() \
+      GROUP BY UNIX_TIMESTAMP(added) DIV ${div} \
+      ORDER BY statistics.added DESC;`;
+  }
+
+  private getQueryForDays(div: number, interval: string) {
+    return `SELECT
+      UNIX_TIMESTAMP(added) as added,
+      CAST(avg(vbytes_per_second) as DOUBLE) as vbytes_per_second,
+      vsize_1,
+      vsize_2,
+      vsize_3,
+      vsize_4,
+      vsize_5,
+      vsize_6,
+      vsize_8,
+      vsize_10,
+      vsize_12,
+      vsize_15,
+      vsize_20,
+      vsize_30,
+      vsize_40,
+      vsize_50,
+      vsize_60,
+      vsize_70,
+      vsize_80,
+      vsize_90,
+      vsize_100,
+      vsize_125,
+      vsize_150,
+      vsize_175,
+      vsize_200,
+      vsize_250,
+      vsize_300,
+      vsize_350,
+      vsize_400,
+      vsize_500,
+      vsize_600,
+      vsize_700,
+      vsize_800,
+      vsize_900,
+      vsize_1000,
+      vsize_1200,
+      vsize_1400,
+      vsize_1600,
+      vsize_1800,
+      vsize_2000 \
+      FROM statistics \
+      WHERE added BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW() \
+      GROUP BY UNIX_TIMESTAMP(added) DIV ${div} \
+      ORDER BY statistics.added DESC;`;
+  }
+
+  public async $get(id: number): Promise<OptimizedStatistic | undefined> {
+    try {
+      const query = `SELECT *, UNIX_TIMESTAMP(added) as added FROM statistics WHERE id = ?`;
+      const [rows] = await DB.query(query, [id]);
+      if (rows[0]) {
+        return this.mapStatisticToOptimizedStatistic([rows[0]])[0];
+      }
+    } catch (e) {
+      logger.err('$list2H() error' + (e instanceof Error ? e.message : e));
+    }
+  }
+
+  public async $list2H(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = `SELECT *, UNIX_TIMESTAMP(added) as added FROM statistics ORDER BY statistics.added DESC LIMIT 120`;
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list2H() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list24H(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = `SELECT *, UNIX_TIMESTAMP(added) as added FROM statistics ORDER BY statistics.added DESC LIMIT 1440`;
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list24h() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list1W(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDaysAvg(300, '1 WEEK'); // 5m interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list1W() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list1M(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDaysAvg(1800, '1 MONTH'); // 30m interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list1M() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list3M(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDaysAvg(7200, '3 MONTH'); // 2h interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list3M() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list6M(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDaysAvg(10800, '6 MONTH'); // 3h interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list6M() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list1Y(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDays(28800, '1 YEAR'); // 8h interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list1Y() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list2Y(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDays(28800, '2 YEAR'); // 8h interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list2Y() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  public async $list3Y(): Promise<OptimizedStatistic[]> {
+    try {
+      const query = this.getQueryForDays(43200, '3 YEAR'); // 12h interval
+      const [rows] = await DB.query({ sql: query, timeout: this.queryTimeout });
+      return this.mapStatisticToOptimizedStatistic(rows as Statistic[]);
+    } catch (e) {
+      logger.err('$list3Y() error' + (e instanceof Error ? e.message : e));
+      return [];
+    }
+  }
+
+  private mapStatisticToOptimizedStatistic(statistic: Statistic[]): OptimizedStatistic[] {
+    return statistic.map((s) => {
+      return {
+        added: s.added,
+        vbytes_per_second: s.vbytes_per_second,
+        mempool_byte_weight: s.mempool_byte_weight,
+        total_fee: s.total_fee,
+        vsizes: [
+          s.vsize_1,
+          s.vsize_2,
+          s.vsize_3,
+          s.vsize_4,
+          s.vsize_5,
+          s.vsize_6,
+          s.vsize_8,
+          s.vsize_10,
+          s.vsize_12,
+          s.vsize_15,
+          s.vsize_20,
+          s.vsize_30,
+          s.vsize_40,
+          s.vsize_50,
+          s.vsize_60,
+          s.vsize_70,
+          s.vsize_80,
+          s.vsize_90,
+          s.vsize_100,
+          s.vsize_125,
+          s.vsize_150,
+          s.vsize_175,
+          s.vsize_200,
+          s.vsize_250,
+          s.vsize_300,
+          s.vsize_350,
+          s.vsize_400,
+          s.vsize_500,
+          s.vsize_600,
+          s.vsize_700,
+          s.vsize_800,
+          s.vsize_900,
+          s.vsize_1000,
+          s.vsize_1200,
+          s.vsize_1400,
+          s.vsize_1600,
+          s.vsize_1800,
+          s.vsize_2000,
+        ]
+      };
+    });
+  }
+}
+
+export default new StatisticsApi();

backend/src/api/statistics/statistics.routes.ts

@@ -0,0 +1,67 @@
+import { Application, Request, Response } from 'express';
+import config from '../../config';
+import statisticsApi from './statistics-api';
+
+class StatisticsRoutes {
+  public initRoutes(app: Application) {
+    app
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/2h', this.$getStatisticsByTime.bind(this, '2h'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/24h', this.$getStatisticsByTime.bind(this, '24h'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/1w', this.$getStatisticsByTime.bind(this, '1w'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/1m', this.$getStatisticsByTime.bind(this, '1m'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/3m', this.$getStatisticsByTime.bind(this, '3m'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/6m', this.$getStatisticsByTime.bind(this, '6m'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/1y', this.$getStatisticsByTime.bind(this, '1y'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/2y', this.$getStatisticsByTime.bind(this, '2y'))
+      .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/3y', this.$getStatisticsByTime.bind(this, '3y'))
+    ;
+  }
+
+  private async $getStatisticsByTime(time: '2h' | '24h' | '1w' | '1m' | '3m' | '6m' | '1y' | '2y' | '3y', req: Request, res: Response) {
+    res.header('Pragma', 'public');
+    res.header('Cache-control', 'public');
+    res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+
+    try {
+      let result;
+      switch (time as string) {
+        case '2h':
+          result = await statisticsApi.$list2H();
+          res.setHeader('Expires', new Date(Date.now() + 1000 * 30).toUTCString());
+          break;
+        case '24h':
+          result = await statisticsApi.$list24H();
+          res.setHeader('Expires', new Date(Date.now() + 1000 * 60).toUTCString());
+          break;
+        case '1w':
+          result = await statisticsApi.$list1W();
+          break;
+        case '1m':
+          result = await statisticsApi.$list1M();
+          break;
+        case '3m':
+          result = await statisticsApi.$list3M();
+          break;
+        case '6m':
+          result = await statisticsApi.$list6M();
+          break;
+        case '1y':
+          result = await statisticsApi.$list1Y();
+          break;
+        case '2y':
+          result = await statisticsApi.$list2Y();
+          break;
+        case '3y':
+          result = await statisticsApi.$list3Y();
+          break;
+        default:
+          result = await statisticsApi.$list2H();
+      }
+      res.json(result);
+    } catch (e) {
+      res.status(500).send(e instanceof Error ? e.message : e);
+    }
+  }
+}
+
+export default new StatisticsRoutes();

backend/src/api/statistics/statistics.ts

@@ -0,0 +1,153 @@
+import memPool from '../mempool';
+import logger from '../../logger';
+import { TransactionExtended, OptimizedStatistic } from '../../mempool.interfaces';
+import { Common } from '../common';
+import statisticsApi from './statistics-api';
+
+class Statistics {
+  protected intervalTimer: NodeJS.Timer | undefined;
+  protected newStatisticsEntryCallback: ((stats: OptimizedStatistic) => void) | undefined;
+
+  public setNewStatisticsEntryCallback(fn: (stats: OptimizedStatistic) => void) {
+    this.newStatisticsEntryCallback = fn;
+  }
+
+  public startStatistics(): void {
+    logger.info('Starting statistics service');
+
+    const now = new Date();
+    const nextInterval = new Date(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(),
+      Math.floor(now.getMinutes() / 1) * 1 + 1, 0, 0);
+    const difference = nextInterval.getTime() - now.getTime();
+
+    setTimeout(() => {
+      this.runStatistics();
+      this.intervalTimer = setInterval(() => {
+        this.runStatistics();
+      }, 1 * 60 * 1000);
+    }, difference);
+  }
+
+  private async runStatistics(): Promise<void> {
+    if (!memPool.isInSync()) {
+      return;
+    }
+    const currentMempool = memPool.getMempool();
+    const txPerSecond = memPool.getTxPerSecond();
+    const vBytesPerSecond = memPool.getVBytesPerSecond();
+
+    logger.debug('Running statistics');
+
+    let memPoolArray: TransactionExtended[] = [];
+    for (const i in currentMempool) {
+      if (currentMempool.hasOwnProperty(i)) {
+        memPoolArray.push(currentMempool[i]);
+      }
+    }
+    // Remove 0 and undefined
+    memPoolArray = memPoolArray.filter((tx) => tx.effectiveFeePerVsize);
+
+    if (!memPoolArray.length) {
+      try {
+        const insertIdZeroed = await statisticsApi.$createZeroedStatistic();
+        if (this.newStatisticsEntryCallback && insertIdZeroed) {
+          const newStats = await statisticsApi.$get(insertIdZeroed);
+          if (newStats) {
+            this.newStatisticsEntryCallback(newStats);
+          }
+        }
+      } catch (e) {
+        logger.err('Unable to insert zeroed statistics. ' + e);
+      }
+      return;
+    }
+
+    memPoolArray.sort((a, b) => a.effectiveFeePerVsize - b.effectiveFeePerVsize);
+    const totalWeight = memPoolArray.map((tx) => tx.vsize).reduce((acc, curr) => acc + curr) * 4;
+    const totalFee = memPoolArray.map((tx) => tx.fee).reduce((acc, curr) => acc + curr);
+
+    const logFees = [1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200,
+      250, 300, 350, 400, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000];
+
+    const weightVsizeFees: { [feePerWU: number]: number } = {};
+    const lastItem = logFees.length - 1;
+
+    memPoolArray.forEach((transaction) => {
+      for (let i = 0; i < logFees.length; i++) {
+        if (
+          (Common.isLiquid() && (i === lastItem || transaction.effectiveFeePerVsize * 10 < logFees[i + 1]))
+          ||
+          (!Common.isLiquid() && (i === lastItem || transaction.effectiveFeePerVsize < logFees[i + 1]))
+        ) {
+          if (weightVsizeFees[logFees[i]]) {
+            weightVsizeFees[logFees[i]] += transaction.vsize;
+          } else {
+            weightVsizeFees[logFees[i]] = transaction.vsize;
+          }
+          break;
+        }
+      }
+    });
+
+    try {
+      const insertId = await statisticsApi.$create({
+        added: 'NOW()',
+        unconfirmed_transactions: memPoolArray.length,
+        tx_per_second: txPerSecond,
+        vbytes_per_second: Math.round(vBytesPerSecond),
+        mempool_byte_weight: totalWeight,
+        total_fee: totalFee,
+        fee_data: '',
+        vsize_1: weightVsizeFees['1'] || 0,
+        vsize_2: weightVsizeFees['2'] || 0,
+        vsize_3: weightVsizeFees['3'] || 0,
+        vsize_4: weightVsizeFees['4'] || 0,
+        vsize_5: weightVsizeFees['5'] || 0,
+        vsize_6: weightVsizeFees['6'] || 0,
+        vsize_8: weightVsizeFees['8'] || 0,
+        vsize_10: weightVsizeFees['10'] || 0,
+        vsize_12: weightVsizeFees['12'] || 0,
+        vsize_15: weightVsizeFees['15'] || 0,
+        vsize_20: weightVsizeFees['20'] || 0,
+        vsize_30: weightVsizeFees['30'] || 0,
+        vsize_40: weightVsizeFees['40'] || 0,
+        vsize_50: weightVsizeFees['50'] || 0,
+        vsize_60: weightVsizeFees['60'] || 0,
+        vsize_70: weightVsizeFees['70'] || 0,
+        vsize_80: weightVsizeFees['80'] || 0,
+        vsize_90: weightVsizeFees['90'] || 0,
+        vsize_100: weightVsizeFees['100'] || 0,
+        vsize_125: weightVsizeFees['125'] || 0,
+        vsize_150: weightVsizeFees['150'] || 0,
+        vsize_175: weightVsizeFees['175'] || 0,
+        vsize_200: weightVsizeFees['200'] || 0,
+        vsize_250: weightVsizeFees['250'] || 0,
+        vsize_300: weightVsizeFees['300'] || 0,
+        vsize_350: weightVsizeFees['350'] || 0,
+        vsize_400: weightVsizeFees['400'] || 0,
+        vsize_500: weightVsizeFees['500'] || 0,
+        vsize_600: weightVsizeFees['600'] || 0,
+        vsize_700: weightVsizeFees['700'] || 0,
+        vsize_800: weightVsizeFees['800'] || 0,
+        vsize_900: weightVsizeFees['900'] || 0,
+        vsize_1000: weightVsizeFees['1000'] || 0,
+        vsize_1200: weightVsizeFees['1200'] || 0,
+        vsize_1400: weightVsizeFees['1400'] || 0,
+        vsize_1600: weightVsizeFees['1600'] || 0,
+        vsize_1800: weightVsizeFees['1800'] || 0,
+        vsize_2000: weightVsizeFees['2000'] || 0,
+      });
+
+      if (this.newStatisticsEntryCallback && insertId) {
+        const newStats = await statisticsApi.$get(insertId);
+        if (newStats) {
+          this.newStatisticsEntryCallback(newStats);
+        }
+      }
+    } catch (e) {
+      logger.err('Unable to insert statistics. ' + e);
+    }
+  }
+}
+
+export default new Statistics();

backend/src/api/transaction-utils.ts

@@ -1,7 +1,8 @@
 import bitcoinApi from './bitcoin/bitcoin-api-factory';
-import logger from '../logger';
 import { TransactionExtended, TransactionMinerInfo } from '../mempool.interfaces';
 import { IEsploraApi } from './bitcoin/esplora-api.interface';
+import config from '../config';
+import { Common } from './common';
 
 class TransactionUtils {
   constructor() { }
@@ -20,32 +21,37 @@ class TransactionUtils {
     };
   }
 
-  public async $getTransactionExtended(txId: string, forceBitcoind = false, addPrevouts = false): Promise<TransactionExtended | null> {
-    try {
-      let transaction: IEsploraApi.Transaction;
-      if (forceBitcoind) {
-        transaction = await bitcoinApi.$getRawTransactionBitcoind(txId, false, addPrevouts);
-      } else {
-        transaction = await bitcoinApi.$getRawTransaction(txId, false, addPrevouts);
-      }
-      return this.extendTransaction(transaction);
-    } catch (e) {
-      logger.debug('getTransactionExtended error: ' + (e.message || e));
-      logger.debug(JSON.stringify(e));
-      return null;
-    }
+  public async $getTransactionExtended(txId: string, addPrevouts = false, lazyPrevouts = false): Promise<TransactionExtended> {
+    const transaction: IEsploraApi.Transaction = await bitcoinApi.$getRawTransaction(txId, false, addPrevouts, lazyPrevouts);
+    return this.extendTransaction(transaction);
   }
 
   private extendTransaction(transaction: IEsploraApi.Transaction): TransactionExtended {
+    // @ts-ignore
+    if (transaction.vsize) {
+      // @ts-ignore
+      return transaction;
+    }
+    const feePerVbytes = Math.max(Common.isLiquid() ? 0.1 : 1,
+      (transaction.fee || 0) / (transaction.weight / 4));
     const transactionExtended: TransactionExtended = Object.assign({
       vsize: Math.round(transaction.weight / 4),
-      feePerVsize: Math.max(1, (transaction.fee || 0) / (transaction.weight / 4)),
+      feePerVsize: feePerVbytes,
+      effectiveFeePerVsize: feePerVbytes,
     }, transaction);
     if (!transaction.status.confirmed) {
       transactionExtended.firstSeen = Math.round((new Date().getTime() / 1000));
     }
     return transactionExtended;
   }
+
+  public hex2ascii(hex: string) {
+    let str = '';
+    for (let i = 0; i < hex.length; i += 2) {
+      str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
+    }
+    return str;
+  }
 }
 
 export default new TransactionUtils();

backend/src/api/websocket-handler.ts

@@ -1,7 +1,9 @@
 import logger from '../logger';
 import * as WebSocket from 'ws';
-import { BlockExtended, TransactionExtended, WebsocketResponse, MempoolBlock,
-  OptimizedStatistic, ILoadingIndicators, IConversionRates } from '../mempool.interfaces';
+import {
+  BlockExtended, TransactionExtended, WebsocketResponse, MempoolBlock, MempoolBlockDelta,
+  OptimizedStatistic, ILoadingIndicators, IConversionRates
+} from '../mempool.interfaces';
 import blocks from './blocks';
 import memPool from './mempool';
 import backendInfo from './backend-info';
@@ -11,10 +13,14 @@ import { Common } from './common';
 import loadingIndicators from './loading-indicators';
 import config from '../config';
 import transactionUtils from './transaction-utils';
+import rbfCache from './rbf-cache';
+import difficultyAdjustment from './difficulty-adjustment';
+import feeApi from './fee-api';
+import BlocksAuditsRepository from '../repositories/BlocksAuditsRepository';
+import BlocksSummariesRepository from '../repositories/BlocksSummariesRepository';
 
 class WebsocketHandler {
   private wss: WebSocket.Server | undefined;
-  private nativeAssetId = '6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d';
   private extraInitProperties = {};
 
   constructor() { }
@@ -34,7 +40,7 @@ class WebsocketHandler {
 
     this.wss.on('connection', (client: WebSocket) => {
       client.on('error', logger.info);
-      client.on('message', (message: string) => {
+      client.on('message', async (message: string) => {
         try {
           const parsedMessage: WebsocketResponse = JSON.parse(message);
           const response = {};
@@ -49,13 +55,38 @@ class WebsocketHandler {
           if (parsedMessage && parsedMessage['track-tx']) {
             if (/^[a-fA-F0-9]{64}$/.test(parsedMessage['track-tx'])) {
               client['track-tx'] = parsedMessage['track-tx'];
-              // Client is telling the transaction wasn't found but it might have appeared before we had the time to start watching for it
+              // Client is telling the transaction wasn't found
               if (parsedMessage['watch-mempool']) {
-                const tx = memPool.getMempool()[client['track-tx']];
-                if (tx) {
-                  response['tx'] = tx;
+                const rbfCacheTx = rbfCache.get(client['track-tx']);
+                if (rbfCacheTx) {
+                  response['txReplaced'] = {
+                    txid: rbfCacheTx.txid,
+                  };
+                  client['track-tx'] = null;
                 } else {
-                  client['track-mempool-tx'] = parsedMessage['track-tx'];
+                  // It might have appeared before we had the time to start watching for it
+                  const tx = memPool.getMempool()[client['track-tx']];
+                  if (tx) {
+                    if (config.MEMPOOL.BACKEND === 'esplora') {
+                      response['tx'] = tx;
+                    } else {
+                      // tx.prevout is missing from transactions when in bitcoind mode
+                      try {
+                        const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, true);
+                        response['tx'] = fullTx;
+                      } catch (e) {
+                        logger.debug('Error finding transaction: ' + (e instanceof Error ? e.message : e));
+                      }
+                    }
+                  } else {
+                    try {
+                      const fullTx = await transactionUtils.$getTransactionExtended(client['track-tx'], true);
+                      response['tx'] = fullTx;
+                    } catch (e) {
+                      logger.debug('Error finding transaction. ' + (e instanceof Error ? e.message : e));
+                      client['track-mempool-tx'] = parsedMessage['track-tx'];
+                    }
+                  }
                 }
               }
             } else {
@@ -64,9 +95,13 @@ class WebsocketHandler {
           }
 
           if (parsedMessage && parsedMessage['track-address']) {
-            if (/^([a-km-zA-HJ-NP-Z1-9]{26,35}|[a-km-zA-HJ-NP-Z1-9]{80}|[a-z]{2,5}1[ac-hj-np-z02-9]{8,87})$/
+            if (/^([a-km-zA-HJ-NP-Z1-9]{26,35}|[a-km-zA-HJ-NP-Z1-9]{80}|[a-z]{2,5}1[ac-hj-np-z02-9]{8,100}|[A-Z]{2,5}1[AC-HJ-NP-Z02-9]{8,100})$/
               .test(parsedMessage['track-address'])) {
-              client['track-address'] = parsedMessage['track-address'];
+              let matchedAddress = parsedMessage['track-address'];
+              if (/^[A-Z]{2,5}1[AC-HJ-NP-Z02-9]{8,100}$/.test(parsedMessage['track-address'])) {
+                matchedAddress = matchedAddress.toLowerCase();
+              }
+              client['track-address'] = matchedAddress;
             } else {
               client['track-address'] = null;
             }
@@ -80,8 +115,22 @@ class WebsocketHandler {
             }
           }
 
+          if (parsedMessage && parsedMessage['track-mempool-block'] !== undefined) {
+            if (Number.isInteger(parsedMessage['track-mempool-block']) && parsedMessage['track-mempool-block'] >= 0) {
+              const index = parsedMessage['track-mempool-block'];
+              client['track-mempool-block'] = index;
+              const mBlocksWithTransactions = mempoolBlocks.getMempoolBlocksWithTransactions();
+              response['projected-block-transactions'] = {
+                index: index,
+                blockTransactions: mBlocksWithTransactions[index]?.transactions || [],
+              };
+            } else {
+              client['track-mempool-block'] = null;
+            }
+          }
+
           if (parsedMessage.action === 'init') {
-            const _blocks = blocks.getBlocks().slice(-8);
+            const _blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
             if (!_blocks) {
               return;
             }
@@ -96,11 +145,19 @@ class WebsocketHandler {
             client['track-donation'] = parsedMessage['track-donation'];
           }
 
+          if (parsedMessage['track-bisq-market']) {
+            if (/^[a-z]{3}_[a-z]{3}$/.test(parsedMessage['track-bisq-market'])) {
+              client['track-bisq-market'] = parsedMessage['track-bisq-market'];
+            } else {
+              client['track-bisq-market'] = null;
+            }
+          }
+
           if (Object.keys(response).length) {
             client.send(JSON.stringify(response));
           }
         } catch (e) {
-          logger.debug('Error parsing websocket message: ' + e.message || e);
+          logger.debug('Error parsing websocket message: ' + (e instanceof Error ? e.message : e));
         }
       });
     });
@@ -111,7 +168,7 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
-    this.wss.clients.forEach((client: WebSocket) => {
+    this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
@@ -126,7 +183,7 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
-    this.wss.clients.forEach((client: WebSocket) => {
+    this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
@@ -139,7 +196,7 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
-    this.wss.clients.forEach((client: WebSocket) => {
+    this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
@@ -149,19 +206,19 @@ class WebsocketHandler {
 
   getInitData(_blocks?: BlockExtended[]) {
     if (!_blocks) {
-      _blocks = blocks.getBlocks().slice(-8);
+      _blocks = blocks.getBlocks().slice(-config.MEMPOOL.INITIAL_BLOCKS_AMOUNT);
     }
     return {
       'mempoolInfo': memPool.getMempoolInfo(),
       'vBytesPerSecond': memPool.getVBytesPerSecond(),
-      'lastDifficultyAdjustment': blocks.getLastDifficultyAdjustmentTime(),
       'blocks': _blocks,
       'conversions': fiatConversion.getConversionRates(),
       'mempool-blocks': mempoolBlocks.getMempoolBlocks(),
       'transactions': memPool.getLatestTransactions(),
-      'git-commit': backendInfo.gitCommitHash,
-      'hostname': backendInfo.hostname,
+      'backendInfo': backendInfo.getBackendInfo(),
       'loadingIndicators': loadingIndicators.getLoadingIndicators(),
+      'da': difficultyAdjustment.getDifficultyAdjustment(),
+      'fees': feeApi.getRecommendedFee(),
       ...this.extraInitProperties
     };
   }
@@ -171,7 +228,7 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
-    this.wss.clients.forEach((client: WebSocket) => {
+    this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
@@ -194,11 +251,15 @@ class WebsocketHandler {
 
     mempoolBlocks.updateMempoolBlocks(newMempool);
     const mBlocks = mempoolBlocks.getMempoolBlocks();
+    const mBlockDeltas = mempoolBlocks.getMempoolBlockDeltas();
     const mempoolInfo = memPool.getMempoolInfo();
     const vBytesPerSecond = memPool.getVBytesPerSecond();
     const rbfTransactions = Common.findRbfTransactions(newTransactions, deletedTransactions);
+    const da = difficultyAdjustment.getDifficultyAdjustment();
+    memPool.handleRbfTransactions(rbfTransactions);
+    const recommendedFees = feeApi.getRecommendedFee();
 
-    this.wss.clients.forEach(async (client: WebSocket) => {
+    this.wss.clients.forEach(async (client) => {
       if (client.readyState !== WebSocket.OPEN) {
         return;
       }
@@ -209,6 +270,8 @@ class WebsocketHandler {
         response['mempoolInfo'] = mempoolInfo;
         response['vBytesPerSecond'] = vBytesPerSecond;
         response['transactions'] = newTransactions.slice(0, 6).map((tx) => Common.stripTransaction(tx));
+        response['da'] = da;
+        response['fees'] = recommendedFees;
       }
 
       if (client['want-mempool-blocks']) {
@@ -219,9 +282,11 @@ class WebsocketHandler {
         const tx = newTransactions.find((t) => t.txid === client['track-mempool-tx']);
         if (tx) {
           if (config.MEMPOOL.BACKEND !== 'esplora') {
-            const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, false, true);
-            if (fullTx) {
+            try {
+              const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, true);
               response['tx'] = fullTx;
+            } catch (e) {
+              logger.debug('Error finding transaction in mempool: ' + (e instanceof Error ? e.message : e));
             }
           } else {
             response['tx'] = tx;
@@ -237,9 +302,11 @@ class WebsocketHandler {
           const someVin = tx.vin.some((vin) => !!vin.prevout && vin.prevout.scriptpubkey_address === client['track-address']);
           if (someVin) {
             if (config.MEMPOOL.BACKEND !== 'esplora') {
-              const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, false, true);
-              if (fullTx) {
+              try {
+                const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, true);
                 foundTransactions.push(fullTx);
+              } catch (e) {
+                logger.debug('Error finding transaction in mempool: ' + (e instanceof Error ? e.message : e));
               }
             } else {
               foundTransactions.push(tx);
@@ -249,9 +316,11 @@ class WebsocketHandler {
           const someVout = tx.vout.some((vout) => vout.scriptpubkey_address === client['track-address']);
           if (someVout) {
             if (config.MEMPOOL.BACKEND !== 'esplora') {
-              const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, false, true);
-              if (fullTx) {
+              try {
+                const fullTx = await transactionUtils.$getTransactionExtended(tx.txid, true);
                 foundTransactions.push(fullTx);
+              } catch (e) {
+                logger.debug('Error finding transaction in mempool: ' + (e instanceof Error ? e.message : e));
               }
             } else {
               foundTransactions.push(tx);
@@ -269,7 +338,7 @@ class WebsocketHandler {
 
         newTransactions.forEach((tx) => {
 
-          if (client['track-asset'] === this.nativeAssetId) {
+          if (client['track-asset'] === Common.nativeAssetId) {
             if (tx.vin.some((vin) => !!vin.is_pegin)) {
               foundTransactions.push(tx);
               return;
@@ -293,20 +362,40 @@ class WebsocketHandler {
         }
       }
 
-      if (client['track-tx'] && rbfTransactions[client['track-tx']]) {
-        for (const rbfTransaction in rbfTransactions) {
-          if (client['track-tx'] === rbfTransaction) {
-            const rbfTx = rbfTransactions[rbfTransaction];
-            if (config.MEMPOOL.BACKEND !== 'esplora') {
-              const fullTx = await transactionUtils.$getTransactionExtended(rbfTransaction, false, true);
-              if (fullTx) {
-                response['rbfTransaction'] = fullTx;
-              }
-            } else {
-              response['rbfTransaction'] = rbfTx;
-            }
-            break;
+      if (client['track-tx']) {
+        const outspends: object = {};
+        newTransactions.forEach((tx) => tx.vin.forEach((vin, i) => {
+          if (vin.txid === client['track-tx']) {
+            outspends[vin.vout] = {
+              vin: i,
+              txid: tx.txid,
+            };
           }
+        }));
+
+        if (Object.keys(outspends).length) {
+          response['utxoSpent'] = outspends;
+        }
+
+        if (rbfTransactions[client['track-tx']]) {
+          for (const rbfTransaction in rbfTransactions) {
+            if (client['track-tx'] === rbfTransaction) {
+              response['rbfTransaction'] = {
+                txid: rbfTransactions[rbfTransaction].txid,
+              };
+              break;
+            }
+          }
+        }
+      }
+
+      if (client['track-mempool-block'] >= 0) {
+        const index = client['track-mempool-block'];
+        if (mBlockDeltas[index]) {
+          response['projected-block-transactions'] = {
+            index: index,
+            delta: mBlockDeltas[index],
+          };
         }
       }
 
@@ -321,31 +410,72 @@ class WebsocketHandler {
       throw new Error('WebSocket.Server is not set');
     }
 
-    // Check how many transactions in the new block matches the latest projected mempool block
-    // If it's more than 0, recalculate the mempool blocks and send to client in the same update
     let mBlocks: undefined | MempoolBlock[];
+    let mBlockDeltas: undefined | MempoolBlockDelta[];
     let matchRate = 0;
+    const _memPool = memPool.getMempool();
     const _mempoolBlocks = mempoolBlocks.getMempoolBlocksWithTransactions();
+
     if (_mempoolBlocks[0]) {
       const matches: string[] = [];
+      const added: string[] = [];
+      const missing: string[] = [];
+
       for (const txId of txIds) {
         if (_mempoolBlocks[0].transactionIds.indexOf(txId) > -1) {
           matches.push(txId);
+        } else {
+          added.push(txId);
         }
+        delete _memPool[txId];
       }
 
-      matchRate = Math.round((matches.length / (txIds.length - 1)) * 100);
-      if (matchRate > 0) {
-        const currentMemPool = memPool.getMempool();
-        for (const txId of matches) {
-          delete currentMemPool[txId];
+      for (const txId of _mempoolBlocks[0].transactionIds) {
+        if (matches.includes(txId) || added.includes(txId)) {
+          continue;
         }
-        mempoolBlocks.updateMempoolBlocks(currentMemPool);
-        mBlocks = mempoolBlocks.getMempoolBlocks();
+        missing.push(txId);
+      }
+
+      matchRate = Math.round((Math.max(0, matches.length - missing.length - added.length) / txIds.length * 100) * 100) / 100;
+      mempoolBlocks.updateMempoolBlocks(_memPool);
+      mBlocks = mempoolBlocks.getMempoolBlocks();
+      mBlockDeltas = mempoolBlocks.getMempoolBlockDeltas();
+
+      if (Common.indexingEnabled()) {
+        const stripped = _mempoolBlocks[0].transactions.map((tx) => {
+          return {
+            txid: tx.txid,
+            vsize: tx.vsize,
+            fee: tx.fee ? Math.round(tx.fee) : 0,
+            value: tx.value,
+          };
+        });  
+        BlocksSummariesRepository.$saveSummary({
+          height: block.height,
+          template: {
+            id: block.id,
+            transactions: stripped
+          }
+        });
+
+        BlocksAuditsRepository.$saveAudit({
+          time: block.timestamp,
+          height: block.height,
+          hash: block.id,
+          addedTxs: added,
+          missingTxs: missing,
+          matchRate: matchRate,
+        });
       }
     }
 
-    block.matchRate = matchRate;
+    if (block.extras) {
+      block.extras.matchRate = matchRate;
+    }
+
+    const da = difficultyAdjustment.getDifficultyAdjustment();
+    const fees = feeApi.getRecommendedFee();
 
     this.wss.clients.forEach((client) => {
       if (client.readyState !== WebSocket.OPEN) {
@@ -359,7 +489,8 @@ class WebsocketHandler {
       const response = {
         'block': block,
         'mempoolInfo': memPool.getMempoolInfo(),
-        'lastDifficultyAdjustment': blocks.getLastDifficultyAdjustmentTime(),
+        'da': da,
+        'fees': fees,
       };
 
       if (mBlocks && client['want-mempool-blocks']) {
@@ -367,7 +498,6 @@ class WebsocketHandler {
       }
 
       if (client['track-tx'] && txIds.indexOf(client['track-tx']) > -1) {
-        client['track-tx'] = null;
         response['txConfirmed'] = true;
       }
 
@@ -402,7 +532,7 @@ class WebsocketHandler {
         const foundTransactions: TransactionExtended[] = [];
 
         transactions.forEach((tx) => {
-          if (client['track-asset'] === this.nativeAssetId) {
+          if (client['track-asset'] === Common.nativeAssetId) {
             if (tx.vin && tx.vin.some((vin) => !!vin.is_pegin)) {
               foundTransactions.push(tx);
               return;
@@ -435,6 +565,16 @@ class WebsocketHandler {
         }
       }
 
+      if (client['track-mempool-block'] >= 0) {
+        const index = client['track-mempool-block'];
+        if (mBlockDeltas && mBlockDeltas[index]) {
+          response['projected-block-transactions'] = {
+            index: index,
+            delta: mBlockDeltas[index],
+          };
+        }
+      }
+
       client.send(JSON.stringify(response));
     });
   }

backend/src/config.ts

@@ -2,21 +2,45 @@ const configFile = require('../mempool-config.json');
 
 interface IConfig {
   MEMPOOL: {
-    NETWORK: 'mainnet' | 'testnet' | 'liquid';
+    NETWORK: 'mainnet' | 'testnet' | 'signet' | 'liquid' | 'liquidtestnet';
     BACKEND: 'esplora' | 'electrum' | 'none';
     HTTP_PORT: number;
     SPAWN_CLUSTER_PROCS: number;
     API_URL_PREFIX: string;
     POLL_RATE_MS: number;
+    CACHE_DIR: string;
+    CLEAR_PROTECTION_MINUTES: number;
+    RECOMMENDED_FEE_PERCENTILE: number;
+    BLOCK_WEIGHT_UNITS: number;
+    INITIAL_BLOCKS_AMOUNT: number;
+    MEMPOOL_BLOCKS_AMOUNT: number;
+    INDEXING_BLOCKS_AMOUNT: number;
+    BLOCKS_SUMMARIES_INDEXING: boolean;
+    PRICE_FEED_UPDATE_INTERVAL: number;
+    USE_SECOND_NODE_FOR_MINFEE: boolean;
+    EXTERNAL_ASSETS: string[];
+    EXTERNAL_MAX_RETRY: number;
+    EXTERNAL_RETRY_INTERVAL: number;
+    USER_AGENT: string;
+    STDOUT_LOG_MIN_PRIORITY: 'emerg' | 'alert' | 'crit' | 'err' | 'warn' | 'notice' | 'info' | 'debug';
+    AUTOMATIC_BLOCK_REINDEXING: boolean;
   };
   ESPLORA: {
     REST_API_URL: string;
   };
+  LIGHTNING: {
+    ENABLED: boolean;
+    BACKEND: 'lnd' | 'cln' | 'ldk';
+  };
+  LND: {
+    TLS_CERT_PATH: string;
+    MACAROON_PATH: string;
+    SOCKET: string;
+  };
   ELECTRUM: {
     HOST: string;
     PORT: number;
     TLS_ENABLED: boolean;
-    TX_LOOKUPS: boolean;
   };
   CORE_RPC: {
     HOST: string;
@@ -24,33 +48,62 @@ interface IConfig {
     USERNAME: string;
     PASSWORD: string;
   };
+  SECOND_CORE_RPC: {
+    HOST: string;
+    PORT: number;
+    USERNAME: string;
+    PASSWORD: string;
+  };
   DATABASE: {
     ENABLED: boolean;
     HOST: string,
+    SOCKET: string,
     PORT: number;
     DATABASE: string;
     USERNAME: string;
     PASSWORD: string;
   };
+  SYSLOG: {
+    ENABLED: boolean;
+    HOST: string;
+    PORT: number;
+    MIN_PRIORITY: 'emerg' | 'alert' | 'crit' | 'err' | 'warn' | 'notice' | 'info' | 'debug';
+    FACILITY: string;
+  };
   STATISTICS: {
     ENABLED: boolean;
     TX_PER_SECOND_SAMPLE_PERIOD: number;
   };
-  BISQ_BLOCKS: {
+  BISQ: {
     ENABLED: boolean;
     DATA_PATH: string;
   };
-  BISQ_MARKETS: {
+  SOCKS5PROXY: {
     ENABLED: boolean;
-    DATA_PATH: string;
+    USE_ONION: boolean;
+    HOST: string;
+    PORT: number;
+    USERNAME: string;
+    PASSWORD: string;
   };
-  SPONSORS: {
+  PRICE_DATA_SERVER: {
+    TOR_URL: string;
+    CLEARNET_URL: string;
+  };
+  EXTERNAL_DATA_SERVER: {
+    MEMPOOL_API: string;
+    MEMPOOL_ONION: string;
+    LIQUID_API: string;
+    LIQUID_ONION: string;
+    BISQ_URL: string;
+    BISQ_ONION: string;
+  };
+  MAXMIND: {
     ENABLED: boolean;
-    BTCPAY_URL: string;
-    BTCPAY_AUTH: string;
-    BTCPAY_WEBHOOK_URL: string;
-    TWITTER_BEARER_AUTH: string;
-  };
+    GEOLITE2_CITY: string;
+    GEOLITE2_ASN: string;
+    GEOIP2_ISP: string;
+  },
 }
 
 const defaults: IConfig = {
@@ -60,7 +113,23 @@ const defaults: IConfig = {
     'HTTP_PORT': 8999,
     'SPAWN_CLUSTER_PROCS': 0,
     'API_URL_PREFIX': '/api/v1/',
-    'POLL_RATE_MS': 2000
+    'POLL_RATE_MS': 2000,
+    'CACHE_DIR': './cache',
+    'CLEAR_PROTECTION_MINUTES': 20,
+    'RECOMMENDED_FEE_PERCENTILE': 50,
+    'BLOCK_WEIGHT_UNITS': 4000000,
+    'INITIAL_BLOCKS_AMOUNT': 8,
+    'MEMPOOL_BLOCKS_AMOUNT': 8,
+    'INDEXING_BLOCKS_AMOUNT': 11000, // 0 = disable indexing, -1 = index all blocks
+    'BLOCKS_SUMMARIES_INDEXING': false,
+    'PRICE_FEED_UPDATE_INTERVAL': 600,
+    'USE_SECOND_NODE_FOR_MINFEE': false,
+    'EXTERNAL_ASSETS': [],
+    'EXTERNAL_MAX_RETRY': 1,
+    'EXTERNAL_RETRY_INTERVAL': 0,
+    'USER_AGENT': 'mempool',
+    'STDOUT_LOG_MIN_PRIORITY': 'debug',
+    'AUTOMATIC_BLOCK_REINDEXING': false,
   },
   'ESPLORA': {
     'REST_API_URL': 'http://127.0.0.1:3000',
@@ -69,7 +138,6 @@ const defaults: IConfig = {
     'HOST': '127.0.0.1',
     'PORT': 3306,
     'TLS_ENABLED': true,
-    'TX_LOOKUPS': false
   },
   'CORE_RPC': {
     'HOST': '127.0.0.1',
@@ -77,33 +145,71 @@ const defaults: IConfig = {
     'USERNAME': 'mempool',
     'PASSWORD': 'mempool'
   },
+  'SECOND_CORE_RPC': {
+    'HOST': '127.0.0.1',
+    'PORT': 8332,
+    'USERNAME': 'mempool',
+    'PASSWORD': 'mempool'
+  },
   'DATABASE': {
     'ENABLED': true,
-    'HOST': 'localhost',
+    'HOST': '127.0.0.1',
+    'SOCKET': '',
     'PORT': 3306,
     'DATABASE': 'mempool',
     'USERNAME': 'mempool',
     'PASSWORD': 'mempool'
   },
+  'SYSLOG': {
+    'ENABLED': true,
+    'HOST': '127.0.0.1',
+    'PORT': 514,
+    'MIN_PRIORITY': 'info',
+    'FACILITY': 'local7'
+  },
   'STATISTICS': {
     'ENABLED': true,
     'TX_PER_SECOND_SAMPLE_PERIOD': 150
   },
-  'BISQ_BLOCKS': {
-    'ENABLED': false,
-    'DATA_PATH': '/bisq/statsnode-data/btc_mainnet/db/json'
-  },
-  'BISQ_MARKETS': {
+  'BISQ': {
     'ENABLED': false,
     'DATA_PATH': '/bisq/statsnode-data/btc_mainnet/db'
   },
-  'SPONSORS': {
+  'LIGHTNING': {
     'ENABLED': false,
-    'BTCPAY_URL': '',
-    'BTCPAY_AUTH': '',
-    'BTCPAY_WEBHOOK_URL': '',
-    'TWITTER_BEARER_AUTH': ''
-  }
+    'BACKEND': 'lnd'
+  },
+  'LND': {
+    'TLS_CERT_PATH': '',
+    'MACAROON_PATH': '',
+    'SOCKET': 'localhost:10009',
+  },
+  'SOCKS5PROXY': {
+    'ENABLED': false,
+    'USE_ONION': true,
+    'HOST': '127.0.0.1',
+    'PORT': 9050,
+    'USERNAME': '',
+    'PASSWORD': ''
+  },
+  'PRICE_DATA_SERVER': {
+    'TOR_URL': 'http://wizpriceje6q5tdrxkyiazsgu7irquiqjy2dptezqhrtu7l2qelqktid.onion/getAllMarketPrices',
+    'CLEARNET_URL': 'https://price.bisq.wiz.biz/getAllMarketPrices'
+  },
+  'EXTERNAL_DATA_SERVER': {
+    'MEMPOOL_API': 'https://mempool.space/api/v1',
+    'MEMPOOL_ONION': 'http://mempoolhqx4isw62xs7abwphsq7ldayuidyx2v2oethdhhj6mlo2r6ad.onion/api/v1',
+    'LIQUID_API': 'https://liquid.network/api/v1',
+    'LIQUID_ONION': 'http://liquidmom47f6s3m53ebfxn47p76a6tlnxib3wp6deux7wuzotdr6cyd.onion/api/v1',
+    'BISQ_URL': 'https://bisq.markets/api',
+    'BISQ_ONION': 'http://bisqmktse2cabavbr2xjq7xw3h6g5ottemo5rolfcwt6aly6tp5fdryd.onion/api'
+  },
+  "MAXMIND": {
+    'ENABLED': false,
+    "GEOLITE2_CITY": "/usr/local/share/GeoIP/GeoLite2-City.mmdb",
+    "GEOLITE2_ASN": "/usr/local/share/GeoIP/GeoLite2-ASN.mmdb",
+    "GEOIP2_ISP": "/usr/local/share/GeoIP/GeoIP2-ISP.mmdb"
+  },
 };
 
 class Config implements IConfig {
@@ -111,11 +217,17 @@ class Config implements IConfig {
   ESPLORA: IConfig['ESPLORA'];
   ELECTRUM: IConfig['ELECTRUM'];
   CORE_RPC: IConfig['CORE_RPC'];
+  SECOND_CORE_RPC: IConfig['SECOND_CORE_RPC'];
   DATABASE: IConfig['DATABASE'];
+  SYSLOG: IConfig['SYSLOG'];
   STATISTICS: IConfig['STATISTICS'];
-  BISQ_BLOCKS: IConfig['BISQ_BLOCKS'];
-  BISQ_MARKETS: IConfig['BISQ_MARKETS'];
-  SPONSORS: IConfig['SPONSORS'];
+  BISQ: IConfig['BISQ'];
+  LIGHTNING: IConfig['LIGHTNING'];
+  LND: IConfig['LND'];
+  SOCKS5PROXY: IConfig['SOCKS5PROXY'];
+  PRICE_DATA_SERVER: IConfig['PRICE_DATA_SERVER'];
+  EXTERNAL_DATA_SERVER: IConfig['EXTERNAL_DATA_SERVER'];
+  MAXMIND: IConfig['MAXMIND'];
 
   constructor() {
     const configs = this.merge(configFile, defaults);
@@ -123,11 +235,17 @@ class Config implements IConfig {
     this.ESPLORA = configs.ESPLORA;
     this.ELECTRUM = configs.ELECTRUM;
     this.CORE_RPC = configs.CORE_RPC;
+    this.SECOND_CORE_RPC = configs.SECOND_CORE_RPC;
     this.DATABASE = configs.DATABASE;
+    this.SYSLOG = configs.SYSLOG;
     this.STATISTICS = configs.STATISTICS;
-    this.BISQ_BLOCKS = configs.BISQ_BLOCKS;
-    this.BISQ_MARKETS = configs.BISQ_MARKETS;
-    this.SPONSORS = configs.SPONSORS;
+    this.BISQ = configs.BISQ;
+    this.LIGHTNING = configs.LIGHTNING;
+    this.LND = configs.LND;
+    this.SOCKS5PROXY = configs.SOCKS5PROXY;
+    this.PRICE_DATA_SERVER = configs.PRICE_DATA_SERVER;
+    this.EXTERNAL_DATA_SERVER = configs.EXTERNAL_DATA_SERVER;
+    this.MAXMIND = configs.MAXMIND;
   }
 
   merge = (...objects: object[]): IConfig => {

backend/src/database.ts

@@ -1,26 +1,59 @@
 import config from './config';
-import { createPool } from 'mysql2/promise';
+import { createPool, Pool, PoolConnection } from 'mysql2/promise';
 import logger from './logger';
+import { PoolOptions } from 'mysql2/typings/mysql';
 
-export class DB {
-  static pool = createPool({
-    host: config.DATABASE.HOST,
+ class DB {
+  constructor() {
+    if (config.DATABASE.SOCKET !== '') {
+      this.poolConfig.socketPath = config.DATABASE.SOCKET;
+    } else {
+      this.poolConfig.host = config.DATABASE.HOST;
+    }
+  }
+  private pool: Pool | null = null;
+  private poolConfig: PoolOptions = {
     port: config.DATABASE.PORT,
     database: config.DATABASE.DATABASE,
     user: config.DATABASE.USERNAME,
     password: config.DATABASE.PASSWORD,
     connectionLimit: 10,
     supportBigNumbers: true,
-  });
-}
+    timezone: '+00:00',
+  };
 
-export async function checkDbConnection() {
-  try {
-    const connection = await DB.pool.getConnection();
-    logger.info('Database connection established.');
-    connection.release();
-  } catch (e) {
-    logger.err('Could not connect to database: ' + e.message || e);
-    process.exit(1);
+  private checkDBFlag() {
+    if (config.DATABASE.ENABLED === false) {
+      logger.err('Trying to use DB feature but config.DATABASE.ENABLED is set to false, please open an issue');
+    }
+  }
+
+  public async query(query, params?) {
+    this.checkDBFlag();
+    const pool = await this.getPool();
+    return pool.query(query, params);
+  }
+
+  public async checkDbConnection() {
+    this.checkDBFlag();
+    try {
+      await this.query('SELECT ?', [1]);
+      logger.info('Database connection established.');
+    } catch (e) {
+      logger.err('Could not connect to database: ' + (e instanceof Error ? e.message : e));
+      process.exit(1);
+    }
+  }
+
+  private async getPool(): Promise<Pool> {
+    if (this.pool === null) {
+      this.pool = createPool(this.poolConfig);
+      this.pool.on('connection', function (newConnection: PoolConnection) {
+        newConnection.query(`SET time_zone='+00:00'`);
+      });
+    }
+    return this.pool;
   }
 }
+
+export default new DB();

backend/src/index.ts

@@ -1,31 +1,44 @@
-import { Express, Request, Response, NextFunction } from 'express';
-import * as express from 'express';
+import express from "express";
+import { Application, Request, Response, NextFunction } from 'express';
 import * as http from 'http';
-import * as https from 'https';
 import * as WebSocket from 'ws';
-import * as cluster from 'cluster';
-import axios from 'axios';
-
-import { checkDbConnection } from './database';
+import cluster from 'cluster';
+import DB from './database';
 import config from './config';
-import routes from './routes';
 import blocks from './api/blocks';
 import memPool from './api/mempool';
 import diskCache from './api/disk-cache';
-import statistics from './api/statistics';
+import statistics from './api/statistics/statistics';
 import websocketHandler from './api/websocket-handler';
 import fiatConversion from './api/fiat-conversion';
 import bisq from './api/bisq/bisq';
 import bisqMarkets from './api/bisq/markets';
-import donations from './api/donations';
 import logger from './logger';
 import backendInfo from './api/backend-info';
 import loadingIndicators from './api/loading-indicators';
+import mempool from './api/mempool';
+import elementsParser from './api/liquid/elements-parser';
+import databaseMigration from './api/database-migration';
+import syncAssets from './sync-assets';
+import icons from './api/liquid/icons';
+import { Common } from './api/common';
+import poolsUpdater from './tasks/pools-updater';
+import indexer from './indexer';
+import nodesRoutes from './api/explorer/nodes.routes';
+import channelsRoutes from './api/explorer/channels.routes';
+import generalLightningRoutes from './api/explorer/general.routes';
+import lightningStatsUpdater from './tasks/lightning/stats-updater.service';
+import nodeSyncService from './tasks/lightning/node-sync.service';
+import statisticsRoutes from "./api/statistics/statistics.routes";
+import miningRoutes from "./api/mining/mining-routes";
+import bisqRoutes from "./api/bisq/bisq.routes";
+import liquidRoutes from "./api/liquid/liquid.routes";
+import bitcoinRoutes from "./api/bitcoin/bitcoin.routes";
 
 class Server {
   private wss: WebSocket.Server | undefined;
-  private server: https.Server | http.Server | undefined;
-  private app: Express;
+  private server: http.Server | undefined;
+  private app: Application;
   private currentBackendRetryInterval = 5;
 
   constructor() {
@@ -36,7 +49,7 @@ class Server {
       return;
     }
 
-    if (cluster.isMaster) {
+    if (cluster.isPrimary) {
       logger.notice(`Mempool Server (Master) is running on port ${config.MEMPOOL.HTTP_PORT} (${backendInfo.getShortCommitHash()})`);
 
       const numCPUs = config.MEMPOOL.SPAWN_CLUSTER_PROCS;
@@ -60,63 +73,106 @@ class Server {
     }
   }
 
-  startServer(worker = false) {
+  async startServer(worker = false) {
+    logger.notice(`Starting Mempool Server${worker ? ' (worker)' : ''}... (${backendInfo.getShortCommitHash()})`);
+
     this.app
       .use((req: Request, res: Response, next: NextFunction) => {
         res.setHeader('Access-Control-Allow-Origin', '*');
         next();
       })
       .use(express.urlencoded({ extended: true }))
-      .use(express.json());
+      .use(express.text())
+      ;
 
     this.server = http.createServer(this.app);
     this.wss = new WebSocket.Server({ server: this.server });
 
+    this.setUpWebsocketHandling();
+
+    await syncAssets.syncAssets$();
+    diskCache.loadMempoolCache();
+
     if (config.DATABASE.ENABLED) {
-      checkDbConnection();
+      await DB.checkDbConnection();
+      try {
+        if (process.env.npm_config_reindex !== undefined) { // Re-index requests
+          const tables = process.env.npm_config_reindex.split(',');
+          logger.warn(`Indexed data for "${process.env.npm_config_reindex}" tables will be erased in 5 seconds (using '--reindex')`);
+          await Common.sleep$(5000);
+          await databaseMigration.$truncateIndexedData(tables);
+        }
+        await databaseMigration.$initializeOrMigrateDatabase();
+        if (Common.indexingEnabled()) {
+          await indexer.$resetHashratesIndexingState();
+        }
+      } catch (e) {
+        throw new Error(e instanceof Error ? e.message : 'Error');
+      }
     }
 
-    if (config.STATISTICS.ENABLED && config.DATABASE.ENABLED) {
+    if (config.STATISTICS.ENABLED && config.DATABASE.ENABLED && cluster.isPrimary) {
       statistics.startStatistics();
     }
 
-    this.setUpHttpApiRoutes();
-    this.setUpWebsocketHandling();
-    this.runMainUpdateLoop();
+    if (Common.isLiquid()) {
+      try {
+        icons.loadIcons();
+      } catch (e) {
+        logger.err('Cannot load liquid icons. Ignoring. Reason: ' + (e instanceof Error ? e.message : e));
+      }
+    }
 
     fiatConversion.startService();
-    diskCache.loadMempoolCache();
 
-    if (config.BISQ_BLOCKS.ENABLED) {
+    this.setUpHttpApiRoutes();
+    this.runMainUpdateLoop();
+
+    if (config.BISQ.ENABLED) {
       bisq.startBisqService();
       bisq.setPriceCallbackFunction((price) => websocketHandler.setExtraInitProperties('bsq-price', price));
       blocks.setNewBlockCallback(bisq.handleNewBitcoinBlock.bind(bisq));
+      bisqMarkets.startBisqService();
     }
 
-    if (config.BISQ_MARKETS.ENABLED) {
-      bisqMarkets.startBisqService();
+    if (config.LIGHTNING.ENABLED) {
+      nodeSyncService.$startService()
+        .then(() => lightningStatsUpdater.$startService());
     }
 
     this.server.listen(config.MEMPOOL.HTTP_PORT, () => {
       if (worker) {
         logger.info(`Mempool Server worker #${process.pid} started`);
       } else {
-        logger.notice(`Mempool Server is running on port ${config.MEMPOOL.HTTP_PORT} (${backendInfo.getShortCommitHash()})`);
+        logger.notice(`Mempool Server is running on port ${config.MEMPOOL.HTTP_PORT}`);
       }
     });
   }
 
   async runMainUpdateLoop() {
     try {
-      await memPool.$updateMemPoolInfo();
+      try {
+        await memPool.$updateMemPoolInfo();
+      } catch (e) {
+        const msg = `updateMempoolInfo: ${(e instanceof Error ? e.message : e)}`;
+        if (config.MEMPOOL.USE_SECOND_NODE_FOR_MINFEE) {
+          logger.warn(msg);
+        } else {
+          logger.debug(msg);
+        }
+      }
+      await poolsUpdater.updatePoolsJson();
       await blocks.$updateBlocks();
       await memPool.$updateMempool();
+      indexer.$run();
+
       setTimeout(this.runMainUpdateLoop.bind(this), config.MEMPOOL.POLL_RATE_MS);
       this.currentBackendRetryInterval = 5;
     } catch (e) {
-      const loggerMsg = `runMainLoop error: ${(e.message || e)}. Retrying in ${this.currentBackendRetryInterval} sec.`;
+      const loggerMsg = `runMainLoop error: ${(e instanceof Error ? e.message : e)}. Retrying in ${this.currentBackendRetryInterval} sec.`;
       if (this.currentBackendRetryInterval > 5) {
         logger.warn(loggerMsg);
+        mempool.setOutOfSync();
       } else {
         logger.debug(loggerMsg);
       }
@@ -131,102 +187,41 @@ class Server {
     if (this.wss) {
       websocketHandler.setWebsocketServer(this.wss);
     }
+    if (Common.isLiquid() && config.DATABASE.ENABLED) {
+      blocks.setNewBlockCallback(async () => {
+        try {
+          await elementsParser.$parse();
+        } catch (e) {
+          logger.warn('Elements parsing error: ' + (e instanceof Error ? e.message : e));
+        }
+      });
+    }
     websocketHandler.setupConnectionHandling();
     statistics.setNewStatisticsEntryCallback(websocketHandler.handleNewStatistic.bind(websocketHandler));
     blocks.setNewBlockCallback(websocketHandler.handleNewBlock.bind(websocketHandler));
     memPool.setMempoolChangedCallback(websocketHandler.handleMempoolChange.bind(websocketHandler));
-    donations.setNotfyDonationStatusCallback(websocketHandler.handleNewDonation.bind(websocketHandler));
     fiatConversion.setProgressChangedCallback(websocketHandler.handleNewConversionRates.bind(websocketHandler));
     loadingIndicators.setProgressChangedCallback(websocketHandler.handleLoadingChanged.bind(websocketHandler));
   }
 
   setUpHttpApiRoutes() {
-    this.app
-      .get(config.MEMPOOL.API_URL_PREFIX + 'transaction-times', routes.getTransactionTimes)
-      .get(config.MEMPOOL.API_URL_PREFIX + 'fees/recommended', routes.getRecommendedFees)
-      .get(config.MEMPOOL.API_URL_PREFIX + 'fees/mempool-blocks', routes.getMempoolBlocks)
-      .get(config.MEMPOOL.API_URL_PREFIX + 'backend-info', routes.getBackendInfo)
-      .get(config.MEMPOOL.API_URL_PREFIX + 'init-data', routes.getInitData)
-    ;
-
+    bitcoinRoutes.initRoutes(this.app);
     if (config.STATISTICS.ENABLED && config.DATABASE.ENABLED) {
-      this.app
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/2h', routes.get2HStatistics)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/24h', routes.get24HStatistics.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/1w', routes.get1WHStatistics.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/1m', routes.get1MStatistics.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/3m', routes.get3MStatistics.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/6m', routes.get6MStatistics.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'statistics/1y', routes.get1YStatistics.bind(routes))
-        ;
+      statisticsRoutes.initRoutes(this.app);
     }
-
-    if (config.BISQ_BLOCKS.ENABLED) {
-      this.app
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/stats', routes.getBisqStats)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/tx/:txId', routes.getBisqTransaction)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/block/:hash', routes.getBisqBlock)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/blocks/tip/height', routes.getBisqTip)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/blocks/:index/:length', routes.getBisqBlocks)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/address/:address', routes.getBisqAddress)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/txs/:index/:length', routes.getBisqTransactions)
-      ;
+    if (Common.indexingEnabled()) {
+      miningRoutes.initRoutes(this.app);
     }
-
-    if (config.BISQ_MARKETS.ENABLED) {
-      this.app
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/currencies', routes.getBisqMarketCurrencies.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/depth', routes.getBisqMarketDepth.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/hloc', routes.getBisqMarketHloc.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/markets', routes.getBisqMarketMarkets.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/offers', routes.getBisqMarketOffers.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/ticker', routes.getBisqMarketTicker.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/trades', routes.getBisqMarketTrades.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'bisq/markets/volumes', routes.getBisqMarketVolumes.bind(routes))
-        ;
+    if (config.BISQ.ENABLED) {
+      bisqRoutes.initRoutes(this.app);
     }
-
-    if (config.SPONSORS.ENABLED) {
-      this.app
-        .get(config.MEMPOOL.API_URL_PREFIX + 'donations', routes.getDonations.bind(routes))
-        .get(config.MEMPOOL.API_URL_PREFIX + 'donations/images/:id', routes.getSponsorImage.bind(routes))
-        .post(config.MEMPOOL.API_URL_PREFIX + 'donations', routes.createDonationRequest.bind(routes))
-        .post(config.MEMPOOL.API_URL_PREFIX + 'donations-webhook', routes.donationWebhook.bind(routes))
-      ;
-    } else {
-      this.app
-        .get(config.MEMPOOL.API_URL_PREFIX + 'donations', async (req, res) => {
-          try {
-            const response = await axios.get('https://mempool.space/api/v1/donations', { responseType: 'stream' });
-            response.data.pipe(res);
-          } catch (e) {
-            res.status(500).end();
-          }
-        })
-        .get(config.MEMPOOL.API_URL_PREFIX + 'donations/images/:id', async (req, res) => {
-          try {
-            const response = await axios.get('https://mempool.space/api/v1/donations/images/' + req.params.id, { responseType: 'stream' });
-            response.data.pipe(res);
-          } catch (e) {
-            res.status(500).end();
-          }
-        });
+    if (Common.isLiquid()) {
+      liquidRoutes.initRoutes(this.app);
     }
-
-    if (config.MEMPOOL.BACKEND !== 'esplora') {
-      this.app
-        .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId', routes.getTransaction)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'tx/:txId/outspends', routes.getTransactionOutspends)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash', routes.getBlock)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'blocks/:height', routes.getBlocks)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'blocks', routes.getBlocks)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'block/:hash/txs/:index', routes.getBlockTransactions)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'block-height/:height', routes.getBlockHeight)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'address/:address', routes.getAddress)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'address/:address/txs', routes.getAddressTransactions)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'address/:address/txs/chain/:txId', routes.getAddressTransactions)
-        .get(config.MEMPOOL.API_URL_PREFIX + 'address-prefix/:prefix', routes.getAddressPrefix)
-      ;
+    if (config.LIGHTNING.ENABLED) {
+      generalLightningRoutes.initRoutes(this.app);
+      nodesRoutes.initRoutes(this.app);
+      channelsRoutes.initRoutes(this.app);
     }
   }
 }

backend/src/indexer.ts

@@ -0,0 +1,85 @@
+import { Common } from './api/common';
+import blocks from './api/blocks';
+import mempool from './api/mempool';
+import mining from './api/mining/mining';
+import logger from './logger';
+import HashratesRepository from './repositories/HashratesRepository';
+import bitcoinClient from './api/bitcoin/bitcoin-client';
+import priceUpdater from './tasks/price-updater';
+
+class Indexer {
+  runIndexer = true;
+  indexerRunning = false;
+
+  constructor() {
+  }
+
+  public reindex() {
+    if (Common.indexingEnabled()) {
+      this.runIndexer = true;
+    }
+  }
+
+  public async $run() {
+    if (!Common.indexingEnabled() || this.runIndexer === false ||
+      this.indexerRunning === true || mempool.hasPriority()
+    ) {
+      return;
+    }
+
+    // Do not attempt to index anything unless Bitcoin Core is fully synced
+    const blockchainInfo = await bitcoinClient.getBlockchainInfo();
+    if (blockchainInfo.blocks !== blockchainInfo.headers) {
+      return;
+    }
+
+    this.runIndexer = false;
+    this.indexerRunning = true;
+
+    logger.debug(`Running mining indexer`);
+
+    try {
+      await priceUpdater.$run();
+
+      const chainValid = await blocks.$generateBlockDatabase();
+      if (chainValid === false) {
+        // Chain of block hash was invalid, so we need to reindex. Stop here and continue at the next iteration
+        logger.warn(`The chain of block hash is invalid, re-indexing invalid data in 10 seconds.`);
+        setTimeout(() => this.reindex(), 10000);
+        this.indexerRunning = false;
+        return;
+      }
+
+      await mining.$indexBlockPrices();
+      await mining.$indexDifficultyAdjustments();
+      await this.$resetHashratesIndexingState(); // TODO - Remove this as it's not efficient
+      await mining.$generateNetworkHashrateHistory();
+      await mining.$generatePoolHashrateHistory();
+      await blocks.$generateBlocksSummariesDatabase();
+    } catch (e) {
+      this.indexerRunning = false;
+      logger.err(`Indexer failed, trying again in 10 seconds. Reason: ` + (e instanceof Error ? e.message : e));
+      setTimeout(() => this.reindex(), 10000);
+      this.indexerRunning = false;
+      return;
+    }
+
+    this.indexerRunning = false;
+
+    const runEvery = 1000 * 3600; // 1 hour
+    logger.debug(`Indexing completed. Next run planned at ${new Date(new Date().getTime() + runEvery).toUTCString()}`);
+    setTimeout(() => this.reindex(), runEvery);
+  }
+
+  async $resetHashratesIndexingState() {
+    try {
+      await HashratesRepository.$setLatestRun('last_hashrates_indexing', 0);
+      await HashratesRepository.$setLatestRun('last_weekly_hashrates_indexing', 0);
+    } catch (e) {
+      logger.err(`Cannot reset hashrate indexing timestamps. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+}
+
+export default new Indexer();

backend/src/logger.ts

@@ -50,17 +50,11 @@ class Logger {
   public debug: ((msg: string) => void);
 
   private name = 'mempool';
-  private fac: any;
-  private loghost: string;
-  private logport: number;
   private client: dgram.Socket;
   private network: string;
 
-  constructor(fac) {
+  constructor() {
     let prio;
-    this.fac = fac != null ? fac : Logger.facilities.local0;
-    this.loghost = '127.0.0.1';
-    this.logport = 514;
     for (prio in Logger.priorities) {
       if (true) {
         this.addprio(prio);
@@ -79,7 +73,10 @@ class Logger {
   }
 
   private getNetwork(): string {
-    if (config.BISQ_BLOCKS.ENABLED) {
+    if (config.LIGHTNING.ENABLED) {
+      return 'lightning';
+    }
+    if (config.BISQ.ENABLED) {
       return 'bisq';
     }
     if (config.MEMPOOL.NETWORK && config.MEMPOOL.NETWORK !== 'mainnet') {
@@ -97,10 +94,15 @@ class Logger {
     }
     const network = this.network ? ' <' + this.network + '>' : '';
     prionum = Logger.priorities[priority] || Logger.priorities.info;
-    syslogmsg = `<${(this.fac * 8 + prionum)}> ${this.name}[${process.pid}]: ${priority.toUpperCase()}${network} ${msg}`;
     consolemsg = `${this.ts()} [${process.pid}] ${priority.toUpperCase()}:${network} ${msg}`;
 
-    this.syslog(syslogmsg);
+    if (config.SYSLOG.ENABLED && Logger.priorities[priority] <= Logger.priorities[config.SYSLOG.MIN_PRIORITY]) {
+      syslogmsg = `<${(Logger.facilities[config.SYSLOG.FACILITY] * 8 + prionum)}> ${this.name}[${process.pid}]: ${priority.toUpperCase()}${network} ${msg}`;
+      this.syslog(syslogmsg);
+    }
+    if (Logger.priorities[priority] > Logger.priorities[config.MEMPOOL.STDOUT_LOG_MIN_PRIORITY]) {
+      return;
+    }
     if (priority === 'warning') {
       priority = 'warn';
     }
@@ -116,7 +118,7 @@ class Logger {
   private syslog(msg) {
     let msgbuf;
     msgbuf = Buffer.from(msg);
-    this.client.send(msgbuf, 0, msgbuf.length, this.logport, this.loghost, function(err, bytes) {
+    this.client.send(msgbuf, 0, msgbuf.length, config.SYSLOG.PORT, config.SYSLOG.HOST, function(err, bytes) {
       if (err) {
         console.log(err);
       }
@@ -146,4 +148,4 @@ class Logger {
   }
 }
 
-export default new Logger(Logger.facilities.local7);
+export default new Logger();

backend/src/mempool.interfaces.ts

@@ -1,5 +1,36 @@
 import { IEsploraApi } from './api/bitcoin/esplora-api.interface';
 
+export interface PoolTag {
+  id: number; // mysql row id
+  name: string;
+  link: string;
+  regexes: string; // JSON array
+  addresses: string; // JSON array
+  slug: string;
+}
+
+export interface PoolInfo {
+  poolId: number; // mysql row id
+  name: string;
+  link: string;
+  blockCount: number;
+  slug: string;
+}
+
+export interface PoolStats extends PoolInfo {
+  rank: number;
+  emptyBlocks: number;
+}
+
+export interface BlockAudit {
+  time: number,
+  height: number,
+  hash: string,
+  missingTxs: string[],
+  addedTxs: string[],
+  matchRate: number,
+}
+
 export interface MempoolBlock {
   blockSize: number;
   blockVSize: number;
@@ -11,6 +42,12 @@ export interface MempoolBlock {
 
 export interface MempoolBlockWithTransactions extends MempoolBlock {
   transactionIds: string[];
+  transactions: TransactionStripped[];
+}
+
+export interface MempoolBlockDelta {
+  added: TransactionStripped[];
+  removed: string[];
 }
 
 interface VinStrippedToScriptsig {
@@ -26,20 +63,67 @@ export interface TransactionExtended extends IEsploraApi.Transaction {
   vsize: number;
   feePerVsize: number;
   firstSeen?: number;
+  effectiveFeePerVsize: number;
+  ancestors?: Ancestor[];
+  bestDescendant?: BestDescendant | null;
+  cpfpChecked?: boolean;
+  deleteAfter?: number;
+}
+
+interface Ancestor {
+  txid: string;
+  weight: number;
+  fee: number;
+}
+
+interface BestDescendant {
+  txid: string;
+  weight: number;
+  fee: number;
+}
+
+export interface CpfpInfo {
+  ancestors: Ancestor[];
+  bestDescendant: BestDescendant | null;
 }
 
 export interface TransactionStripped {
   txid: string;
   fee: number;
-  weight: number;
+  vsize: number;
   value: number;
 }
-export interface BlockExtended extends IEsploraApi.Block {
+
+export interface BlockExtension {
+  totalFees?: number;
   medianFee?: number;
   feeRange?: number[];
   reward?: number;
   coinbaseTx?: TransactionMinerInfo;
   matchRate?: number;
+  pool?: {
+    id: number;
+    name: string;
+    slug: string;
+  };
+  avgFee?: number;
+  avgFeeRate?: number;
+  coinbaseRaw?: string;
+  usd?: number | null;
+}
+
+export interface BlockExtended extends IEsploraApi.Block {
+  extras: BlockExtension;
+}
+
+export interface BlockSummary {
+  id: string;
+  transactions: TransactionStripped[];
+}
+
+export interface BlockPrice {
+  height: number;
+  priceId: number;
 }
 
 export interface TransactionMinerInfo {
@@ -106,10 +190,7 @@ export interface Statistic {
 }
 
 export interface OptimizedStatistic {
-  id: number;
   added: string;
-  unconfirmed_transactions: number;
-  tx_per_second: number;
   vbytes_per_second: number;
   total_fee: number;
   mempool_byte_weight: number;
@@ -122,6 +203,7 @@ export interface WebsocketResponse {
   'track-tx': string;
   'track-address': string;
   'watch-mempool': boolean;
+  'track-bisq-market': string;
 }
 
 export interface VbytesPerSecond {
@@ -138,3 +220,34 @@ interface RequiredParams {
 
 export interface ILoadingIndicators { [name: string]: number; }
 export interface IConversionRates { [currency: string]: number; }
+
+export interface IBackendInfo {
+  hostname: string;
+  gitCommit: string;
+  version: string;
+}
+
+export interface IDifficultyAdjustment {
+  progressPercent: number;
+  difficultyChange: number;
+  estimatedRetargetDate: number;
+  remainingBlocks: number;
+  remainingTime: number;
+  previousRetarget: number;
+  nextRetargetHeight: number;
+  timeAvg: number;
+  timeOffset: number;
+}
+
+export interface IndexedDifficultyAdjustment {
+  time: number; // UNIX timestamp
+  height: number; // Block height
+  difficulty: number;
+  adjustment: number;
+}
+
+export interface RewardStats {
+  totalReward: number;
+  totalFee: number;
+  totalTx: number;
+}

backend/src/repositories/BlocksAuditsRepository.ts

@@ -0,0 +1,76 @@
+import transactionUtils from '../api/transaction-utils';
+import DB from '../database';
+import logger from '../logger';
+import { BlockAudit } from '../mempool.interfaces';
+
+class BlocksAuditRepositories {
+  public async $saveAudit(audit: BlockAudit): Promise<void> {
+    try {
+      await DB.query(`INSERT INTO blocks_audits(time, height, hash, missing_txs, added_txs, match_rate)
+        VALUE (FROM_UNIXTIME(?), ?, ?, ?, ?, ?)`, [audit.time, audit.height, audit.hash, JSON.stringify(audit.missingTxs),
+          JSON.stringify(audit.addedTxs), audit.matchRate]);
+    } catch (e: any) {
+      if (e.errno === 1062) { // ER_DUP_ENTRY - This scenario is possible upon node backend restart
+        logger.debug(`Cannot save block audit for block ${audit.hash} because it has already been indexed, ignoring`);
+      } else {
+        logger.err(`Cannot save block audit into db. Reason: ` + (e instanceof Error ? e.message : e));
+        throw e;
+      }
+    }
+  }
+
+  public async $getBlockPredictionsHistory(div: number, interval: string | null): Promise<any> {
+    try {
+      let query = `SELECT UNIX_TIMESTAMP(time) as time, height, match_rate FROM blocks_audits`;
+
+      if (interval !== null) {
+        query += ` WHERE time BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+      }
+
+      query += ` GROUP BY UNIX_TIMESTAMP(time) DIV ${div} ORDER BY height`;
+
+      const [rows] = await DB.query(query);
+      return rows;
+    } catch (e: any) {
+      logger.err(`Cannot fetch block prediction history. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getPredictionsCount(): Promise<number> {
+    try {
+      const [rows] = await DB.query(`SELECT count(hash) as count FROM blocks_audits`);
+      return rows[0].count;
+    } catch (e: any) {
+      logger.err(`Cannot fetch block prediction history. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getBlockAudit(hash: string): Promise<any> {
+    try {
+      const [rows]: any[] = await DB.query(
+        `SELECT blocks.height, blocks.hash as id, UNIX_TIMESTAMP(blocks.blockTimestamp) as timestamp, blocks.size,
+        blocks.weight, blocks.tx_count,
+        transactions, template, missing_txs as missingTxs, added_txs as addedTxs, match_rate as matchRate
+        FROM blocks_audits
+        JOIN blocks ON blocks.hash = blocks_audits.hash
+        JOIN blocks_summaries ON blocks_summaries.id = blocks_audits.hash
+        WHERE blocks_audits.hash = "${hash}"
+      `);
+      
+      rows[0].missingTxs = JSON.parse(rows[0].missingTxs);
+      rows[0].addedTxs = JSON.parse(rows[0].addedTxs);
+      rows[0].transactions = JSON.parse(rows[0].transactions);
+      rows[0].template = JSON.parse(rows[0].template);
+            
+      return rows[0];
+    } catch (e: any) {
+      logger.err(`Cannot fetch block audit from db. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+}
+
+export default new BlocksAuditRepositories();
+

backend/src/repositories/BlocksRepository.ts

@@ -0,0 +1,694 @@
+import { BlockExtended, BlockPrice } from '../mempool.interfaces';
+import DB from '../database';
+import logger from '../logger';
+import { Common } from '../api/common';
+import { prepareBlock } from '../utils/blocks-utils';
+import PoolsRepository from './PoolsRepository';
+import HashratesRepository from './HashratesRepository';
+import { escape } from 'mysql2';
+import BlocksSummariesRepository from './BlocksSummariesRepository';
+import DifficultyAdjustmentsRepository from './DifficultyAdjustmentsRepository';
+
+class BlocksRepository {
+  /**
+   * Save indexed block data in the database
+   */
+  public async $saveBlockInDatabase(block: BlockExtended) {
+    try {
+      const query = `INSERT INTO blocks(
+        height,           hash,                blockTimestamp, size,
+        weight,           tx_count,            coinbase_raw,   difficulty,
+        pool_id,          fees,                fee_span,       median_fee,
+        reward,           version,             bits,           nonce,
+        merkle_root,      previous_block_hash, avg_fee,        avg_fee_rate
+      ) VALUE (
+        ?, ?, FROM_UNIXTIME(?), ?,
+        ?, ?, ?, ?,
+        ?, ?, ?, ?,
+        ?, ?, ?, ?,
+        ?, ?, ?, ?
+      )`;
+
+      const params: any[] = [
+        block.height,
+        block.id,
+        block.timestamp,
+        block.size,
+        block.weight,
+        block.tx_count,
+        block.extras.coinbaseRaw,
+        block.difficulty,
+        block.extras.pool?.id, // Should always be set to something
+        block.extras.totalFees,
+        JSON.stringify(block.extras.feeRange),
+        block.extras.medianFee,
+        block.extras.reward,
+        block.version,
+        block.bits,
+        block.nonce,
+        block.merkle_root,
+        block.previousblockhash,
+        block.extras.avgFee,
+        block.extras.avgFeeRate,
+      ];
+
+      await DB.query(query, params);
+    } catch (e: any) {
+      if (e.errno === 1062) { // ER_DUP_ENTRY - This scenario is possible upon node backend restart
+        logger.debug(`$saveBlockInDatabase() - Block ${block.height} has already been indexed, ignoring`);
+      } else {
+        logger.err('Cannot save indexed block into db. Reason: ' + (e instanceof Error ? e.message : e));
+        throw e;
+      }
+    }
+  }
+
+  /**
+   * Get all block height that have not been indexed between [startHeight, endHeight]
+   */
+  public async $getMissingBlocksBetweenHeights(startHeight: number, endHeight: number): Promise<number[]> {
+    if (startHeight < endHeight) {
+      return [];
+    }
+
+    try {
+      const [rows]: any[] = await DB.query(`
+        SELECT height
+        FROM blocks
+        WHERE height <= ? AND height >= ?
+        ORDER BY height DESC;
+      `, [startHeight, endHeight]);
+
+      const indexedBlockHeights: number[] = [];
+      rows.forEach((row: any) => { indexedBlockHeights.push(row.height); });
+      const seekedBlocks: number[] = Array.from(Array(startHeight - endHeight + 1).keys(), n => n + endHeight).reverse();
+      const missingBlocksHeights = seekedBlocks.filter(x => indexedBlockHeights.indexOf(x) === -1);
+
+      return missingBlocksHeights;
+    } catch (e) {
+      logger.err('Cannot retrieve blocks list to index. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get empty blocks for one or all pools
+   */
+  public async $countEmptyBlocks(poolId: number | null, interval: string | null = null): Promise<any> {
+    interval = Common.getSqlInterval(interval);
+
+    const params: any[] = [];
+    let query = `SELECT count(height) as count, pools.id as poolId
+      FROM blocks
+      JOIN pools on pools.id = blocks.pool_id
+      WHERE tx_count = 1`;
+
+    if (poolId) {
+      query += ` AND pool_id = ?`;
+      params.push(poolId);
+    }
+
+    if (interval) {
+      query += ` AND blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+    }
+
+    query += ` GROUP by pools.id`;
+
+    try {
+      const [rows] = await DB.query(query, params);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot count empty blocks. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Return most recent block height
+   */
+  public async $mostRecentBlockHeight(): Promise<number> {
+    try {
+      const [row] = await DB.query('SELECT MAX(height) as maxHeight from blocks');
+      return row[0]['maxHeight'];
+    } catch (e) {
+      logger.err(`Cannot count blocks for this pool (using offset). Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get blocks count for a period
+   */
+  public async $blockCount(poolId: number | null, interval: string | null = null): Promise<number> {
+    interval = Common.getSqlInterval(interval);
+
+    const params: any[] = [];
+    let query = `SELECT count(height) as blockCount
+      FROM blocks`;
+
+    if (poolId) {
+      query += ` WHERE pool_id = ?`;
+      params.push(poolId);
+    }
+
+    if (interval) {
+      if (poolId) {
+        query += ` AND`;
+      } else {
+        query += ` WHERE`;
+      }
+      query += ` blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+    }
+
+    try {
+      const [rows] = await DB.query(query, params);
+      return <number>rows[0].blockCount;
+    } catch (e) {
+      logger.err(`Cannot count blocks for this pool (using offset). Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get blocks count between two dates
+   * @param poolId
+   * @param from - The oldest timestamp
+   * @param to - The newest timestamp
+   * @returns
+   */
+  public async $blockCountBetweenTimestamp(poolId: number | null, from: number, to: number): Promise<number> {
+    const params: any[] = [];
+    let query = `SELECT
+      count(height) as blockCount,
+      max(height) as lastBlockHeight
+      FROM blocks`;
+
+    if (poolId) {
+      query += ` WHERE pool_id = ?`;
+      params.push(poolId);
+    }
+
+    if (poolId) {
+      query += ` AND`;
+    } else {
+      query += ` WHERE`;
+    }
+    query += ` blockTimestamp BETWEEN FROM_UNIXTIME('${from}') AND FROM_UNIXTIME('${to}')`;
+
+    try {
+      const [rows] = await DB.query(query, params);
+      return <number>rows[0];
+    } catch (e) {
+      logger.err(`Cannot count blocks for this pool (using timestamps). Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get blocks count for a period
+   */
+   public async $blockCountBetweenHeight(startHeight: number, endHeight: number): Promise<number> {
+    const params: any[] = [];
+    let query = `SELECT count(height) as blockCount
+      FROM blocks
+      WHERE height <= ${startHeight} AND height >= ${endHeight}`;
+
+    try {
+      const [rows] = await DB.query(query, params);
+      return <number>rows[0].blockCount;
+    } catch (e) {
+      logger.err(`Cannot count blocks for this pool (using offset). Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get the oldest indexed block
+   */
+  public async $oldestBlockTimestamp(): Promise<number> {
+    const query = `SELECT UNIX_TIMESTAMP(blockTimestamp) as blockTimestamp
+      FROM blocks
+      ORDER BY height
+      LIMIT 1;`;
+
+    try {
+      const [rows]: any[] = await DB.query(query);
+
+      if (rows.length <= 0) {
+        return -1;
+      }
+
+      return <number>rows[0].blockTimestamp;
+    } catch (e) {
+      logger.err('Cannot get oldest indexed block timestamp. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get blocks mined by a specific mining pool
+   */
+  public async $getBlocksByPool(slug: string, startHeight?: number): Promise<object[]> {
+    const pool = await PoolsRepository.$getPool(slug);
+    if (!pool) {
+      throw new Error('This mining pool does not exist ' + escape(slug));
+    }
+
+    const params: any[] = [];
+    let query = ` SELECT
+      blocks.height,
+      hash as id,
+      UNIX_TIMESTAMP(blocks.blockTimestamp) as blockTimestamp,
+      size,
+      weight,
+      tx_count,
+      coinbase_raw,
+      difficulty,
+      fees,
+      fee_span,
+      median_fee,
+      reward,
+      version,
+      bits,
+      nonce,
+      merkle_root,
+      previous_block_hash as previousblockhash,
+      avg_fee,
+      avg_fee_rate
+      FROM blocks
+      WHERE pool_id = ?`;
+    params.push(pool.id);
+
+    if (startHeight !== undefined) {
+      query += ` AND height < ?`;
+      params.push(startHeight);
+    }
+
+    query += ` ORDER BY height DESC
+      LIMIT 10`;
+
+    try {
+      const [rows] = await DB.query(query, params);
+
+      const blocks: BlockExtended[] = [];
+      for (const block of <object[]>rows) {
+        blocks.push(prepareBlock(block));
+      }
+
+      return blocks;
+    } catch (e) {
+      logger.err('Cannot get blocks for this pool. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get one block by height
+   */
+  public async $getBlockByHeight(height: number): Promise<object | null> {
+    try {
+      const [rows]: any[] = await DB.query(`SELECT
+        blocks.height,
+        hash,
+        hash as id,
+        UNIX_TIMESTAMP(blocks.blockTimestamp) as blockTimestamp,
+        size,
+        weight,
+        tx_count,
+        coinbase_raw,
+        difficulty,
+        pools.id as pool_id,
+        pools.name as pool_name,
+        pools.link as pool_link,
+        pools.slug as pool_slug,
+        pools.addresses as pool_addresses,
+        pools.regexes as pool_regexes,
+        fees,
+        fee_span,
+        median_fee,
+        reward,
+        version,
+        bits,
+        nonce,
+        merkle_root,
+        previous_block_hash as previousblockhash,
+        avg_fee,
+        avg_fee_rate
+        FROM blocks
+        JOIN pools ON blocks.pool_id = pools.id
+        WHERE blocks.height = ${height}
+      `);
+
+      if (rows.length <= 0) {
+        return null;
+      }
+
+      rows[0].fee_span = JSON.parse(rows[0].fee_span);
+      return rows[0];
+    } catch (e) {
+      logger.err(`Cannot get indexed block ${height}. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get one block by hash
+   */
+  public async $getBlockByHash(hash: string): Promise<object | null> {
+    try {
+      const query = `
+        SELECT *, blocks.height, UNIX_TIMESTAMP(blocks.blockTimestamp) as blockTimestamp, hash as id,
+        pools.id as pool_id, pools.name as pool_name, pools.link as pool_link, pools.slug as pool_slug,
+        pools.addresses as pool_addresses, pools.regexes as pool_regexes,
+        previous_block_hash as previousblockhash
+        FROM blocks
+        JOIN pools ON blocks.pool_id = pools.id
+        WHERE hash = ?;
+      `;
+      const [rows]: any[] = await DB.query(query, [hash]);
+
+      if (rows.length <= 0) {
+        return null;
+      }
+
+      rows[0].fee_span = JSON.parse(rows[0].fee_span);
+      return rows[0];
+    } catch (e) {
+      logger.err(`Cannot get indexed block ${hash}. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Return blocks difficulty
+   */
+  public async $getBlocksDifficulty(): Promise<object[]> {
+    try {
+      const [rows]: any[] = await DB.query(`SELECT UNIX_TIMESTAMP(blockTimestamp) as time, height, difficulty FROM blocks`);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot get blocks difficulty list from the db. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Return blocks height
+   */
+   public async $getBlocksHeightsAndTimestamp(): Promise<object[]> {
+    try {
+      const [rows]: any[] = await DB.query(`SELECT height, blockTimestamp as timestamp FROM blocks`);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot get blocks height and timestamp from the db. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get general block stats
+   */
+  public async $getBlockStats(blockCount: number): Promise<any> {
+    try {
+      // We need to use a subquery
+      const query = `
+        SELECT MIN(height) as startBlock, MAX(height) as endBlock, SUM(reward) as totalReward, SUM(fees) as totalFee, SUM(tx_count) as totalTx
+        FROM
+          (SELECT height, reward, fees, tx_count FROM blocks
+          ORDER by height DESC
+          LIMIT ?) as sub`;
+
+      const [rows]: any = await DB.query(query, [blockCount]);
+
+      return rows[0];
+    } catch (e) {
+      logger.err('Cannot generate reward stats. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Check if the chain of block hash is valid and delete data from the stale branch if needed
+   */
+  public async $validateChain(): Promise<boolean> {
+    try {
+      const start = new Date().getTime();
+      const [blocks]: any[] = await DB.query(`SELECT height, hash, previous_block_hash,
+        UNIX_TIMESTAMP(blockTimestamp) as timestamp FROM blocks ORDER BY height`);
+
+      let partialMsg = false;
+      let idx = 1;
+      while (idx < blocks.length) {
+        if (blocks[idx].height - 1 !== blocks[idx - 1].height) {
+          if (partialMsg === false) {
+            logger.info('Some blocks are not indexed, skipping missing blocks during chain validation');
+            partialMsg = true;
+          }
+          ++idx;
+          continue;
+        }
+
+        if (blocks[idx].previous_block_hash !== blocks[idx - 1].hash) {
+          logger.warn(`Chain divergence detected at block ${blocks[idx - 1].height}`);
+          await this.$deleteBlocksFrom(blocks[idx - 1].height);
+          await BlocksSummariesRepository.$deleteBlocksFrom(blocks[idx - 1].height);
+          await HashratesRepository.$deleteHashratesFromTimestamp(blocks[idx - 1].timestamp - 604800);
+          await DifficultyAdjustmentsRepository.$deleteAdjustementsFromHeight(blocks[idx - 1].height);
+          return false;
+        }
+        ++idx;
+      }
+
+      logger.debug(`${idx} blocks hash validated in ${new Date().getTime() - start} ms`);
+      return true;
+    } catch (e) {
+      logger.err('Cannot validate chain of block hash. Reason: ' + (e instanceof Error ? e.message : e));
+      return true; // Don't do anything if there is a db error
+    }
+  }
+
+  /**
+   * Delete blocks from the database from blockHeight
+   */
+  public async $deleteBlocksFrom(blockHeight: number) {
+    logger.info(`Delete newer blocks from height ${blockHeight} from the database`);
+
+    try {
+      await DB.query(`DELETE FROM blocks where height >= ${blockHeight}`);
+    } catch (e) {
+      logger.err('Cannot delete indexed blocks. Reason: ' + (e instanceof Error ? e.message : e));
+    }
+  }
+
+  /**
+   * Get the historical averaged block fees
+   */
+  public async $getHistoricalBlockFees(div: number, interval: string | null): Promise<any> {
+    try {
+      let query = `SELECT
+        CAST(AVG(blocks.height) as INT) as avgHeight,
+        CAST(AVG(UNIX_TIMESTAMP(blockTimestamp)) as INT) as timestamp,
+        CAST(AVG(fees) as INT) as avgFees,
+        prices.USD
+        FROM blocks
+        JOIN blocks_prices on blocks_prices.height = blocks.height
+        JOIN prices on prices.id = blocks_prices.price_id
+      `;
+
+      if (interval !== null) {
+        query += ` WHERE blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+      }
+
+      query += ` GROUP BY UNIX_TIMESTAMP(blockTimestamp) DIV ${div}`;
+
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot generate block fees history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get the historical averaged block rewards
+   */
+  public async $getHistoricalBlockRewards(div: number, interval: string | null): Promise<any> {
+    try {
+      let query = `SELECT
+        CAST(AVG(blocks.height) as INT) as avgHeight,
+        CAST(AVG(UNIX_TIMESTAMP(blockTimestamp)) as INT) as timestamp,
+        CAST(AVG(reward) as INT) as avgRewards,
+        prices.USD
+        FROM blocks
+        JOIN blocks_prices on blocks_prices.height = blocks.height
+        JOIN prices on prices.id = blocks_prices.price_id
+      `;
+
+      if (interval !== null) {
+        query += ` WHERE blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+      }
+
+      query += ` GROUP BY UNIX_TIMESTAMP(blockTimestamp) DIV ${div}`;
+
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot generate block rewards history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get the historical averaged block fee rate percentiles
+   */
+   public async $getHistoricalBlockFeeRates(div: number, interval: string | null): Promise<any> {
+    try {
+      let query = `SELECT
+        CAST(AVG(height) as INT) as avgHeight,
+        CAST(AVG(UNIX_TIMESTAMP(blockTimestamp)) as INT) as timestamp,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[0]')) as INT) as avgFee_0,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[1]')) as INT) as avgFee_10,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[2]')) as INT) as avgFee_25,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[3]')) as INT) as avgFee_50,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[4]')) as INT) as avgFee_75,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[5]')) as INT) as avgFee_90,
+        CAST(AVG(JSON_EXTRACT(fee_span, '$[6]')) as INT) as avgFee_100
+      FROM blocks`;
+
+      if (interval !== null) {
+        query += ` WHERE blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+      }
+
+      query += ` GROUP BY UNIX_TIMESTAMP(blockTimestamp) DIV ${div}`;
+
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot generate block fee rates history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get the historical averaged block sizes
+   */
+   public async $getHistoricalBlockSizes(div: number, interval: string | null): Promise<any> {
+    try {
+      let query = `SELECT
+        CAST(AVG(height) as INT) as avgHeight,
+        CAST(AVG(UNIX_TIMESTAMP(blockTimestamp)) as INT) as timestamp,
+        CAST(AVG(size) as INT) as avgSize
+      FROM blocks`;
+
+      if (interval !== null) {
+        query += ` WHERE blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+      }
+
+      query += ` GROUP BY UNIX_TIMESTAMP(blockTimestamp) DIV ${div}`;
+
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot generate block size and weight history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get the historical averaged block weights
+   */
+   public async $getHistoricalBlockWeights(div: number, interval: string | null): Promise<any> {
+    try {
+      let query = `SELECT
+        CAST(AVG(height) as INT) as avgHeight,
+        CAST(AVG(UNIX_TIMESTAMP(blockTimestamp)) as INT) as timestamp,
+        CAST(AVG(weight) as INT) as avgWeight
+      FROM blocks`;
+
+      if (interval !== null) {
+        query += ` WHERE blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+      }
+
+      query += ` GROUP BY UNIX_TIMESTAMP(blockTimestamp) DIV ${div}`;
+
+      const [rows]: any = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot generate block size and weight history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get a list of blocks that have been indexed
+   */
+  public async $getIndexedBlocks(): Promise<any[]> {
+    try {
+      const [rows]: any = await DB.query(`SELECT height, hash FROM blocks ORDER BY height DESC`);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot generate block size and weight history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Return the oldest block  from a consecutive chain of block from the most recent one
+   */
+  public async $getOldestConsecutiveBlock(): Promise<any> {
+    try {
+      const [rows]: any = await DB.query(`SELECT height, UNIX_TIMESTAMP(blockTimestamp) as timestamp, difficulty FROM blocks ORDER BY height DESC`);
+      for (let i = 0; i < rows.length - 1; ++i) {
+        if (rows[i].height - rows[i + 1].height > 1) {
+          return rows[i];
+        }
+      }
+      return rows[rows.length - 1];
+    } catch (e) {
+      logger.err('Cannot generate block size and weight history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get all blocks which have not be linked to a price yet
+   */
+   public async $getBlocksWithoutPrice(): Promise<object[]> {
+    try {
+      const [rows]: any[] = await DB.query(`
+        SELECT UNIX_TIMESTAMP(blocks.blockTimestamp) as timestamp, blocks.height
+        FROM blocks
+        LEFT JOIN blocks_prices ON blocks.height = blocks_prices.height
+        WHERE blocks_prices.height IS NULL
+        ORDER BY blocks.height
+      `);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot get blocks height and timestamp from the db. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Save block price by batch
+   */
+   public async $saveBlockPrices(blockPrices: BlockPrice[]): Promise<void> {
+    try {
+      let query = `INSERT INTO blocks_prices(height, price_id) VALUES`;
+      for (const price of blockPrices) {
+        query += ` (${price.height}, ${price.priceId}),`
+      }
+      query = query.slice(0, -1);
+      await DB.query(query);
+    } catch (e: any) {
+      if (e.errno === 1062) { // ER_DUP_ENTRY - This scenario is possible upon node backend restart
+        logger.debug(`Cannot save blocks prices for blocks [${blockPrices[0].height} to ${blockPrices[blockPrices.length - 1].height}] because it has already been indexed, ignoring`);
+      } else {
+        logger.err(`Cannot save blocks prices for blocks [${blockPrices[0].height} to ${blockPrices[blockPrices.length - 1].height}] into db. Reason: ` + (e instanceof Error ? e.message : e));
+        throw e;
+      }
+    }
+  }
+}
+
+export default new BlocksRepository();

backend/src/repositories/BlocksSummariesRepository.ts

@@ -0,0 +1,69 @@
+import DB from '../database';
+import logger from '../logger';
+import { BlockSummary } from '../mempool.interfaces';
+
+class BlocksSummariesRepository {
+  public async $getByBlockId(id: string): Promise<BlockSummary | undefined> {
+    try {
+      const [summary]: any[] = await DB.query(`SELECT * from blocks_summaries WHERE id = ?`, [id]);
+      if (summary.length > 0) {
+        summary[0].transactions = JSON.parse(summary[0].transactions);
+        return summary[0];
+      }
+    } catch (e) {
+      logger.err(`Cannot get block summary for block id ${id}. Reason: ` + (e instanceof Error ? e.message : e));
+    }
+
+    return undefined;
+  }
+
+  public async $saveSummary(params: { height: number, mined?: BlockSummary, template?: BlockSummary}) {
+    const blockId = params.mined?.id ?? params.template?.id;
+    try {
+      const [dbSummary]: any[] = await DB.query(`SELECT * FROM blocks_summaries WHERE id = "${blockId}"`);
+      if (dbSummary.length === 0) { // First insertion
+        await DB.query(`INSERT INTO blocks_summaries VALUE (?, ?, ?, ?)`, [
+          params.height, blockId, JSON.stringify(params.mined?.transactions ?? []), JSON.stringify(params.template?.transactions ?? [])
+        ]);
+      } else if (params.mined !== undefined) { // Update mined block summary
+        await DB.query(`UPDATE blocks_summaries SET transactions = ? WHERE id = "${params.mined.id}"`, [JSON.stringify(params.mined.transactions)]);
+      } else if (params.template !== undefined) { // Update template block summary
+        await DB.query(`UPDATE blocks_summaries SET template = ? WHERE id = "${params.template.id}"`, [JSON.stringify(params.template?.transactions)]);
+      }
+    } catch (e: any) {
+      if (e.errno === 1062) { // ER_DUP_ENTRY - This scenario is possible upon node backend restart
+        logger.debug(`Cannot save block summary for ${blockId} because it has already been indexed, ignoring`);
+      } else {
+        logger.debug(`Cannot save block summary for ${blockId}. Reason: ${e instanceof Error ? e.message : e}`);
+        throw e;
+      }
+    }
+  }
+
+  public async $getIndexedSummariesId(): Promise<string[]> {
+    try {
+      const [rows]: any[] = await DB.query(`SELECT id from blocks_summaries`);
+      return rows.map(row => row.id);
+    } catch (e) {
+      logger.err(`Cannot get block summaries id list. Reason: ` + (e instanceof Error ? e.message : e));
+    }
+
+    return [];
+  }
+
+  /**
+   * Delete blocks from the database from blockHeight
+   */
+  public async $deleteBlocksFrom(blockHeight: number) {
+    logger.info(`Delete newer blocks summary from height ${blockHeight} from the database`);
+
+    try {
+      await DB.query(`DELETE FROM blocks_summaries where height >= ${blockHeight}`);
+    } catch (e) {
+      logger.err('Cannot delete indexed blocks summaries. Reason: ' + (e instanceof Error ? e.message : e));
+    }
+  }
+}
+
+export default new BlocksSummariesRepository();
+

backend/src/repositories/DifficultyAdjustmentsRepository.ts

@@ -0,0 +1,124 @@
+import { Common } from '../api/common';
+import config from '../config';
+import DB from '../database';
+import logger from '../logger';
+import { IndexedDifficultyAdjustment } from '../mempool.interfaces';
+
+class DifficultyAdjustmentsRepository {
+  public async $saveAdjustments(adjustment: IndexedDifficultyAdjustment): Promise<void> {
+    if (adjustment.height === 1) {
+      return;
+    }
+
+    try {
+      const query = `INSERT INTO difficulty_adjustments(time, height, difficulty, adjustment) VALUE (FROM_UNIXTIME(?), ?, ?, ?)`;
+      const params: any[] = [
+        adjustment.time,
+        adjustment.height,
+        adjustment.difficulty,
+        adjustment.adjustment,
+      ];
+      await DB.query(query, params);
+    } catch (e: any) {
+      if (e.errno === 1062) { // ER_DUP_ENTRY - This scenario is possible upon node backend restart
+        logger.debug(`Cannot save difficulty adjustment at block ${adjustment.height}, already indexed, ignoring`);
+      } else {
+        logger.err(`Cannot save difficulty adjustment at block ${adjustment.height}. Reason: ${e instanceof Error ? e.message : e}`);
+        throw e;
+      }
+    }
+  }
+
+  public async $getAdjustments(interval: string | null, descOrder: boolean = false): Promise<IndexedDifficultyAdjustment[]> {
+    interval = Common.getSqlInterval(interval);
+
+    let query = `SELECT 
+      CAST(AVG(UNIX_TIMESTAMP(time)) as INT) as time,
+      CAST(AVG(height) AS INT) as height,
+      CAST(AVG(difficulty) as DOUBLE) as difficulty,
+      CAST(AVG(adjustment) as DOUBLE) as adjustment
+      FROM difficulty_adjustments`;
+
+    if (interval) {
+      query += ` WHERE time BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+    }
+
+    query += ` GROUP BY UNIX_TIMESTAMP(time) DIV ${86400}`;
+
+    if (descOrder === true) {
+      query += ` ORDER BY height DESC`;
+    } else {
+      query += ` ORDER BY height`;
+    }
+
+    try {
+      const [rows] = await DB.query(query);
+      return rows as IndexedDifficultyAdjustment[];
+    } catch (e) {
+      logger.err(`Cannot get difficulty adjustments from the database. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getRawAdjustments(interval: string | null, descOrder: boolean = false): Promise<IndexedDifficultyAdjustment[]> {
+    interval = Common.getSqlInterval(interval);
+
+    let query = `SELECT 
+      UNIX_TIMESTAMP(time) as time,
+      height as height,
+      difficulty as difficulty,
+      adjustment as adjustment
+      FROM difficulty_adjustments`;
+
+    if (interval) {
+      query += ` WHERE time BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+    }
+
+    if (descOrder === true) {
+      query += ` ORDER BY height DESC`;
+    } else {
+      query += ` ORDER BY height`;
+    }
+
+    try {
+      const [rows] = await DB.query(query);
+      return rows as IndexedDifficultyAdjustment[];
+    } catch (e) {
+      logger.err(`Cannot get difficulty adjustments from the database. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getAdjustmentsHeights(): Promise<number[]> {
+    try {
+      const [rows]: any[] = await DB.query(`SELECT height FROM difficulty_adjustments`);
+      return rows.map(block => block.height);
+    } catch (e: any) {
+      logger.err(`Cannot get difficulty adjustment block heights. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
+  public async $deleteAdjustementsFromHeight(height: number): Promise<void> {
+    try {
+      logger.info(`Delete newer difficulty adjustments from height ${height} from the database`);
+      await DB.query(`DELETE FROM difficulty_adjustments WHERE height >= ?`, [height]);
+    } catch (e: any) {
+      logger.err(`Cannot delete difficulty adjustments from the database. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+
+  public async $deleteLastAdjustment(): Promise<void> {
+    try {
+      logger.info(`Delete last difficulty adjustment from the database`);
+      await DB.query(`DELETE FROM difficulty_adjustments ORDER BY time LIMIT 1`);
+    } catch (e: any) {
+      logger.err(`Cannot delete last difficulty adjustment from the database. Reason: ${e instanceof Error ? e.message : e}`);
+      throw e;
+    }
+  }
+}
+
+export default new DifficultyAdjustmentsRepository();
+

backend/src/repositories/HashratesRepository.ts

@@ -0,0 +1,249 @@
+import { escape } from 'mysql2';
+import { Common } from '../api/common';
+import DB from '../database';
+import logger from '../logger';
+import PoolsRepository from './PoolsRepository';
+
+class HashratesRepository {
+  /**
+   * Save indexed block data in the database
+   */
+  public async $saveHashrates(hashrates: any) {
+    if (hashrates.length === 0) {
+      return;
+    }
+
+    let query = `INSERT INTO
+      hashrates(hashrate_timestamp, avg_hashrate, pool_id, share, type) VALUES`;
+
+    for (const hashrate of hashrates) {
+      query += ` (FROM_UNIXTIME(${hashrate.hashrateTimestamp}), ${hashrate.avgHashrate}, ${hashrate.poolId}, ${hashrate.share}, "${hashrate.type}"),`;
+    }
+    query = query.slice(0, -1);
+
+    try {
+      await DB.query(query);
+    } catch (e: any) {
+      logger.err('Cannot save indexed hashrate into db. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getRawNetworkDailyHashrate(interval: string | null): Promise<any[]> {
+    interval = Common.getSqlInterval(interval);
+
+    let query = `SELECT
+      UNIX_TIMESTAMP(hashrate_timestamp) as timestamp,
+      avg_hashrate as avgHashrate
+      FROM hashrates`;
+
+    if (interval) {
+      query += ` WHERE hashrate_timestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()
+        AND hashrates.type = 'daily'`;
+    } else {
+      query += ` WHERE hashrates.type = 'daily'`;
+    }
+
+    query += ` ORDER by hashrate_timestamp`;
+
+    try {
+      const [rows]: any[] = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot fetch network hashrate history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getNetworkDailyHashrate(interval: string | null): Promise<any[]> {
+    interval = Common.getSqlInterval(interval);
+
+    let query = `SELECT
+      CAST(AVG(UNIX_TIMESTAMP(hashrate_timestamp)) as INT) as timestamp,
+      CAST(AVG(avg_hashrate) as DOUBLE) as avgHashrate
+      FROM hashrates`;
+
+    if (interval) {
+      query += ` WHERE hashrate_timestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()
+        AND hashrates.type = 'daily'`;
+    } else {
+      query += ` WHERE hashrates.type = 'daily'`;
+    }
+
+    query += ` GROUP BY UNIX_TIMESTAMP(hashrate_timestamp) DIV ${86400}`;
+    query += ` ORDER by hashrate_timestamp`;
+
+    try {
+      const [rows]: any[] = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot fetch network hashrate history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getWeeklyHashrateTimestamps(): Promise<number[]> {
+    const query = `SELECT UNIX_TIMESTAMP(hashrate_timestamp) as timestamp
+      FROM hashrates
+      WHERE type = 'weekly'
+      GROUP BY hashrate_timestamp`;
+
+    try {
+      const [rows]: any[] = await DB.query(query);
+      return rows.map(row => row.timestamp);
+    } catch (e) {
+      logger.err('Cannot retreive indexed weekly hashrate timestamps. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Returns the current biggest pool hashrate history
+   */
+  public async $getPoolsWeeklyHashrate(interval: string | null): Promise<any[]> {
+    interval = Common.getSqlInterval(interval);
+
+    const topPoolsId = (await PoolsRepository.$getPoolsInfo('1w')).map((pool) => pool.poolId);
+    if (topPoolsId.length === 0) {
+      return [];
+    }
+
+    let query = `SELECT UNIX_TIMESTAMP(hashrate_timestamp) as timestamp, avg_hashrate as avgHashrate, share, pools.name as poolName
+      FROM hashrates
+      JOIN pools on pools.id = pool_id`;
+
+    if (interval) {
+      query += ` WHERE hashrate_timestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()
+        AND hashrates.type = 'weekly'
+        AND pool_id IN (${topPoolsId})`;
+    } else {
+      query += ` WHERE hashrates.type = 'weekly'
+        AND pool_id IN (${topPoolsId})`;
+    }
+
+    query += ` ORDER by hashrate_timestamp, FIELD(pool_id, ${topPoolsId})`;
+
+    try {
+      const [rows]: any[] = await DB.query(query);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot fetch weekly pools hashrate history. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Returns a pool hashrate history
+   */
+  public async $getPoolWeeklyHashrate(slug: string): Promise<any[]> {
+    const pool = await PoolsRepository.$getPool(slug);
+    if (!pool) {
+      throw new Error('This mining pool does not exist ' + escape(slug));
+    }
+
+    // Find hashrate boundaries
+    let query = `SELECT MIN(hashrate_timestamp) as firstTimestamp, MAX(hashrate_timestamp) as lastTimestamp
+      FROM hashrates
+      JOIN pools on pools.id = pool_id
+      WHERE hashrates.type = 'weekly' AND pool_id = ? AND avg_hashrate != 0
+      ORDER by hashrate_timestamp LIMIT 1`;
+
+    let boundaries = {
+      firstTimestamp: '1970-01-01',
+      lastTimestamp: '9999-01-01'
+    };
+
+    try {
+      const [rows]: any[] = await DB.query(query, [pool.id]);
+      boundaries = rows[0];
+    } catch (e) {
+      logger.err('Cannot fetch hashrate start/end timestamps for this pool. Reason: ' + (e instanceof Error ? e.message : e));
+    }
+
+    // Get hashrates entries between boundaries
+    query = `SELECT UNIX_TIMESTAMP(hashrate_timestamp) as timestamp, avg_hashrate as avgHashrate, share, pools.name as poolName
+      FROM hashrates
+      JOIN pools on pools.id = pool_id
+      WHERE hashrates.type = 'weekly' AND hashrate_timestamp BETWEEN ? AND ?
+      AND pool_id = ?
+      ORDER by hashrate_timestamp`;
+
+    try {
+      const [rows]: any[] = await DB.query(query, [boundaries.firstTimestamp, boundaries.lastTimestamp, pool.id]);
+      return rows;
+    } catch (e) {
+      logger.err('Cannot fetch pool hashrate history for this pool. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Set latest run timestamp
+   */
+  public async $setLatestRun(key: string, val: number) {
+    const query = `UPDATE state SET number = ? WHERE name = ?`;
+
+    try {
+      await DB.query(query, [val, key]);
+    } catch (e) {
+      logger.err(`Cannot set last indexing run for ${key}. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get latest run timestamp
+   */
+  public async $getLatestRun(key: string): Promise<number> {
+    const query = `SELECT number FROM state WHERE name = ?`;
+
+    try {
+      const [rows]: any[] = await DB.query(query, [key]);
+
+      if (rows.length === 0) {
+        return 0;
+      }
+      return rows[0]['number'];
+    } catch (e) {
+      logger.err(`Cannot retrieve last indexing run for ${key}. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Delete most recent data points for re-indexing
+   */
+  public async $deleteLastEntries() {
+    logger.info(`Delete latest hashrates data points from the database`);
+
+    try {
+      const [rows]: any[] = await DB.query(`SELECT MAX(hashrate_timestamp) as timestamp FROM hashrates GROUP BY type`);
+      for (const row of rows) {
+        await DB.query(`DELETE FROM hashrates WHERE hashrate_timestamp = ?`, [row.timestamp]);
+      }
+      // Re-run the hashrate indexing to fill up missing data
+      await this.$setLatestRun('last_hashrates_indexing', 0);
+      await this.$setLatestRun('last_weekly_hashrates_indexing', 0);
+    } catch (e) {
+      logger.err('Cannot delete latest hashrates data points. Reason: ' + (e instanceof Error ? e.message : e));
+    }
+  }
+  
+  /**
+   * Delete hashrates from the database from timestamp
+   */
+  public async $deleteHashratesFromTimestamp(timestamp: number) {
+    logger.info(`Delete newer hashrates from timestamp ${new Date(timestamp * 1000).toUTCString()} from the database`);
+
+    try {
+      await DB.query(`DELETE FROM hashrates WHERE hashrate_timestamp >= FROM_UNIXTIME(?)`, [timestamp]);
+      // Re-run the hashrate indexing to fill up missing data
+      await this.$setLatestRun('last_hashrates_indexing', 0);
+      await this.$setLatestRun('last_weekly_hashrates_indexing', 0);
+    } catch (e) {
+      logger.err('Cannot delete latest hashrates data points. Reason: ' + (e instanceof Error ? e.message : e));
+    }
+  }
+}
+
+export default new HashratesRepository();

backend/src/repositories/PoolsRepository.ts

@@ -0,0 +1,99 @@
+import { Common } from '../api/common';
+import config from '../config';
+import DB from '../database';
+import logger from '../logger';
+import { PoolInfo, PoolTag } from '../mempool.interfaces';
+
+class PoolsRepository {
+  /**
+   * Get all pools tagging info
+   */
+  public async $getPools(): Promise<PoolTag[]> {
+    const [rows] = await DB.query('SELECT id, name, addresses, regexes, slug FROM pools;');
+    return <PoolTag[]>rows;
+  }
+
+  /**
+   * Get unknown pool tagging info
+   */
+  public async $getUnknownPool(): Promise<PoolTag> {
+    const [rows] = await DB.query('SELECT id, name, slug FROM pools where name = "Unknown"');
+    return <PoolTag>rows[0];
+  }
+
+  /**
+   * Get basic pool info and block count
+   */
+  public async $getPoolsInfo(interval: string | null = null): Promise<PoolInfo[]> {
+    interval = Common.getSqlInterval(interval);
+
+    let query = `SELECT COUNT(height) as blockCount, pool_id as poolId, pools.name as name, pools.link as link, slug
+      FROM blocks
+      JOIN pools on pools.id = pool_id`;
+
+    if (interval) {
+      query += ` WHERE blocks.blockTimestamp BETWEEN DATE_SUB(NOW(), INTERVAL ${interval}) AND NOW()`;
+    }
+
+    query += ` GROUP BY pool_id
+      ORDER BY COUNT(height) DESC`;
+
+    try {
+      const [rows] = await DB.query(query);
+      return <PoolInfo[]>rows;
+    } catch (e) {
+      logger.err(`Cannot generate pools stats. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get basic pool info and block count between two timestamp
+   */
+   public async $getPoolsInfoBetween(from: number, to: number): Promise<PoolInfo[]> {
+    const query = `SELECT COUNT(height) as blockCount, pools.id as poolId, pools.name as poolName
+      FROM pools
+      LEFT JOIN blocks on pools.id = blocks.pool_id AND blocks.blockTimestamp BETWEEN FROM_UNIXTIME(?) AND FROM_UNIXTIME(?)
+      GROUP BY pools.id`;
+
+    try {
+      const [rows] = await DB.query(query, [from, to]);
+      return <PoolInfo[]>rows;
+    } catch (e) {
+      logger.err('Cannot generate pools blocks count. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  /**
+   * Get mining pool statistics for one pool
+   */
+   public async $getPool(slug: string): Promise<PoolTag | null> {
+    const query = `
+      SELECT *
+      FROM pools
+      WHERE pools.slug = ?`;
+
+    try {
+      const [rows]: any[] = await DB.query(query, [slug]);
+
+      if (rows.length < 1) {
+        return null;
+      }
+
+      rows[0].regexes = JSON.parse(rows[0].regexes);
+      if (['testnet', 'signet'].includes(config.MEMPOOL.NETWORK)) {
+        rows[0].addresses = []; // pools.json only contains mainnet addresses
+      } else {
+        rows[0].addresses = JSON.parse(rows[0].addresses);
+      }
+
+      return rows[0];
+    } catch (e) {
+      logger.err('Cannot get pool from db. Reason: ' + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+}
+
+export default new PoolsRepository();

backend/src/repositories/PricesRepository.ts

@@ -0,0 +1,47 @@
+import DB from '../database';
+import logger from '../logger';
+import { Prices } from '../tasks/price-updater';
+
+class PricesRepository {
+  public async $savePrices(time: number, prices: Prices): Promise<void> {
+    if (prices.USD === -1) {
+      // Some historical price entries have not USD prices, so we just ignore them to avoid future UX issues
+      // As of today there are only 4 (on 2013-09-05, 2013-09-19, 2013-09-12 and 2013-09-26) so that's fine
+      return;
+    }
+
+    try {
+      await DB.query(`
+        INSERT INTO prices(time,             USD, EUR, GBP, CAD, CHF, AUD, JPY)
+        VALUE             (FROM_UNIXTIME(?), ?,   ?,   ?,   ?,   ?,   ?,   ?  )`,
+        [time, prices.USD, prices.EUR, prices.GBP, prices.CAD, prices.CHF, prices.AUD, prices.JPY]
+      );
+    } catch (e: any) {
+      logger.err(`Cannot save exchange rate into db. Reason: ` + (e instanceof Error ? e.message : e));
+      throw e;
+    }
+  }
+
+  public async $getOldestPriceTime(): Promise<number> {
+    const [oldestRow] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices WHERE USD != -1 ORDER BY time LIMIT 1`);
+    return oldestRow[0] ? oldestRow[0].time : 0;
+  }
+
+  public async $getLatestPriceTime(): Promise<number> {
+    const [oldestRow] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices WHERE USD != -1 ORDER BY time DESC LIMIT 1`);
+    return oldestRow[0] ? oldestRow[0].time : 0;
+  }
+
+  public async $getPricesTimes(): Promise<number[]> {
+    const [times]: any[] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time from prices WHERE USD != -1 ORDER BY time`);
+    return times.map(time => time.time);
+  }
+
+  public async $getPricesTimesAndId(): Promise<number[]> {
+    const [times]: any[] = await DB.query(`SELECT UNIX_TIMESTAMP(time) as time, id, USD from prices ORDER BY time`);
+    return times;
+  }
+}
+
+export default new PricesRepository();
+

backend/src/routes.ts

@@ -1,676 +0,0 @@
-import config from './config';
-import { Request, Response } from 'express';
-import statistics from './api/statistics';
-import feeApi from './api/fee-api';
-import backendInfo from './api/backend-info';
-import mempoolBlocks from './api/mempool-blocks';
-import mempool from './api/mempool';
-import bisq from './api/bisq/bisq';
-import websocketHandler from './api/websocket-handler';
-import bisqMarket from './api/bisq/markets-api';
-import { OptimizedStatistic, RequiredSpec, TransactionExtended } from './mempool.interfaces';
-import { MarketsApiError } from './api/bisq/interfaces';
-import { IEsploraApi } from './api/bitcoin/esplora-api.interface';
-import donations from './api/donations';
-import logger from './logger';
-import bitcoinApi from './api/bitcoin/bitcoin-api-factory';
-import transactionUtils from './api/transaction-utils';
-import blocks from './api/blocks';
-import loadingIndicators from './api/loading-indicators';
-
-class Routes {
-  private cache: { [date: string]: OptimizedStatistic[] } = {
-    '24h': [], '1w': [], '1m': [], '3m': [], '6m': [], '1y': [],
-  };
-
-  constructor() {
-    if (config.DATABASE.ENABLED && config.STATISTICS.ENABLED) {
-      this.createCache();
-      setInterval(this.createCache.bind(this), 600000);
-    }
-  }
-
-  private async createCache() {
-    this.cache['24h'] = await statistics.$list24H();
-    this.cache['1w'] = await statistics.$list1W();
-    this.cache['1m'] = await statistics.$list1M();
-    this.cache['3m'] = await statistics.$list3M();
-    this.cache['6m'] = await statistics.$list6M();
-    this.cache['1y'] = await statistics.$list1Y();
-    logger.debug('Statistics cache created');
-  }
-
-  public async get2HStatistics(req: Request, res: Response) {
-    const result = await statistics.$list2H();
-    res.json(result);
-  }
-
-  public get24HStatistics(req: Request, res: Response) {
-    res.json(this.cache['24h']);
-  }
-
-  public get1WHStatistics(req: Request, res: Response) {
-    res.json(this.cache['1w']);
-  }
-
-  public get1MStatistics(req: Request, res: Response) {
-    res.json(this.cache['1m']);
-  }
-
-  public get3MStatistics(req: Request, res: Response) {
-    res.json(this.cache['3m']);
-  }
-
-  public get6MStatistics(req: Request, res: Response) {
-    res.json(this.cache['6m']);
-  }
-
-  public get1YStatistics(req: Request, res: Response) {
-    res.json(this.cache['1y']);
-  }
-
-  public getInitData(req: Request, res: Response) {
-    try {
-      const result = websocketHandler.getInitData();
-      res.json(result);
-    } catch (e) {
-      res.status(500).send(e.message);
-    }
-  }
-
-  public async getRecommendedFees(req: Request, res: Response) {
-    if (!mempool.isInSync()) {
-      res.statusCode = 503;
-      res.send('Service Unavailable');
-      return;
-    }
-    const result = feeApi.getRecommendedFee();
-    res.json(result);
-  }
-
-  public getMempoolBlocks(req: Request, res: Response) {
-    try {
-      const result = mempoolBlocks.getMempoolBlocks();
-      res.json(result);
-    } catch (e) {
-      res.status(500).send(e.message);
-    }
-  }
-
-  public getTransactionTimes(req: Request, res: Response) {
-    if (!Array.isArray(req.query.txId)) {
-      res.status(500).send('Not an array');
-      return;
-    }
-    const txIds: string[] = [];
-    for (const _txId in req.query.txId) {
-      if (typeof req.query.txId[_txId] === 'string') {
-        txIds.push(req.query.txId[_txId].toString());
-      }
-    }
-
-    const times = mempool.getFirstSeenForTransactions(txIds);
-    res.json(times);
-  }
-
-  public getBackendInfo(req: Request, res: Response) {
-    res.json(backendInfo.getBackendInfo());
-  }
-
-  public async createDonationRequest(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'amount': {
-        required: true,
-        types: ['@float']
-      },
-      'orderId': {
-        required: true,
-        types: ['@string']
-      }
-    };
-
-    const p = this.parseRequestParameters(req.body, constraints);
-    if (p.error) {
-      res.status(400).send(p.error);
-      return;
-    }
-
-    if (p.orderId !== '' && !/^(@|)[a-zA-Z0-9_]{1,15}$/.test(p.orderId)) {
-      res.status(400).send('Invalid Twitter handle');
-      return;
-    }
-
-    if (p.amount < 0.001) {
-      res.status(400).send('Amount needs to be at least 0.001');
-      return;
-    }
-
-    if (p.amount > 1000) {
-      res.status(400).send('Amount too large');
-      return;
-    }
-
-    try {
-      const result = await donations.$createRequest(p.amount, p.orderId);
-      res.json(result);
-    } catch (e) {
-      res.status(500).send(e.message);
-    }
-  }
-
-  public async getDonations(req: Request, res: Response) {
-    try {
-      const result = await donations.$getDonationsFromDatabase('handle, imageUrl');
-      res.json(result);
-    } catch (e) {
-      res.status(500).send(e.message);
-    }
-  }
-
-  public async getSponsorImage(req: Request, res: Response) {
-    try {
-      const result = await donations.getSponsorImage(req.params.id);
-      if (result) {
-        res.set('Content-Type', 'image/jpeg');
-        res.send(result);
-      } else {
-        res.status(404).end();
-      }
-    } catch (e) {
-      res.status(500).send(e.message);
-    }
-  }
-
-  public async donationWebhook(req: Request, res: Response) {
-    try {
-      donations.$handleWebhookRequest(req.body);
-      res.end();
-    } catch (e) {
-      res.status(500).send(e);
-    }
-  }
-
-  public getBisqStats(req: Request, res: Response) {
-    const result = bisq.getStats();
-    res.json(result);
-  }
-
-  public getBisqTip(req: Request, res: Response) {
-    const result = bisq.getLatestBlockHeight();
-    res.type('text/plain');
-    res.send(result.toString());
-  }
-
-  public getBisqTransaction(req: Request, res: Response) {
-    const result = bisq.getTransaction(req.params.txId);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(404).send('Bisq transaction not found');
-    }
-  }
-
-  public getBisqTransactions(req: Request, res: Response) {
-    const types: string[] = [];
-    req.query.types = req.query.types || [];
-    if (!Array.isArray(req.query.types)) {
-      res.status(500).send('Types is not an array');
-      return;
-    }
-
-    for (const _type in req.query.types) {
-      if (typeof req.query.types[_type] === 'string') {
-        types.push(req.query.types[_type].toString());
-      }
-    }
-
-    const index = parseInt(req.params.index, 10) || 0;
-    const length = parseInt(req.params.length, 10) > 100 ? 100 : parseInt(req.params.length, 10) || 25;
-    const [transactions, count] = bisq.getTransactions(index, length, types);
-    res.header('X-Total-Count', count.toString());
-    res.json(transactions);
-  }
-
-  public getBisqBlock(req: Request, res: Response) {
-    const result = bisq.getBlock(req.params.hash);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(404).send('Bisq block not found');
-    }
-  }
-
-  public getBisqBlocks(req: Request, res: Response) {
-    const index = parseInt(req.params.index, 10) || 0;
-    const length = parseInt(req.params.length, 10) > 100 ? 100 : parseInt(req.params.length, 10) || 25;
-    const [transactions, count] = bisq.getBlocks(index, length);
-    res.header('X-Total-Count', count.toString());
-    res.json(transactions);
-  }
-
-  public getBisqAddress(req: Request, res: Response) {
-    const result = bisq.getAddress(req.params.address.substr(1));
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(404).send('Bisq address not found');
-    }
-  }
-
-  public getBisqMarketCurrencies(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'type': {
-        required: false,
-        types: ['crypto', 'fiat', 'all']
-      },
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getCurrencies(p.type);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketCurrencies error'));
-    }
-  }
-
-  public getBisqMarketDepth(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'market': {
-        required: true,
-        types: ['@string']
-      },
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getDepth(p.market);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketDepth error'));
-    }
-  }
-
-  public getBisqMarketMarkets(req: Request, res: Response) {
-    const result = bisqMarket.getMarkets();
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketMarkets error'));
-    }
-  }
-
-  public getBisqMarketTrades(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'market': {
-        required: true,
-        types: ['@string']
-      },
-      'timestamp_from': {
-        required: false,
-        types: ['@number']
-      },
-      'timestamp_to': {
-        required: false,
-        types: ['@number']
-      },
-      'trade_id_to': {
-        required: false,
-        types: ['@string']
-      },
-      'trade_id_from': {
-        required: false,
-        types: ['@string']
-      },
-      'direction': {
-        required: false,
-        types: ['buy', 'sell']
-      },
-      'limit': {
-        required: false,
-        types: ['@number']
-      },
-      'sort': {
-        required: false,
-        types: ['asc', 'desc']
-      }
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getTrades(p.market, p.timestamp_from,
-      p.timestamp_to, p.trade_id_from, p.trade_id_to, p.direction, p.limit, p.sort);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketTrades error'));
-    }
-  }
-
-  public getBisqMarketOffers(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'market': {
-        required: true,
-        types: ['@string']
-      },
-      'direction': {
-        required: false,
-        types: ['buy', 'sell']
-      },
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getOffers(p.market, p.direction);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketOffers error'));
-    }
-  }
-
-  public getBisqMarketVolumes(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'market': {
-        required: false,
-        types: ['@string']
-      },
-      'interval': {
-        required: false,
-        types: ['minute', 'half_hour', 'hour', 'half_day', 'day', 'week', 'month', 'year', 'auto']
-      },
-      'timestamp_from': {
-        required: false,
-        types: ['@number']
-      },
-      'timestamp_to': {
-        required: false,
-        types: ['@number']
-      },
-      'milliseconds': {
-        required: false,
-        types: ['@boolean']
-      },
-      'timestamp': {
-        required: false,
-        types: ['no', 'yes']
-      },
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getVolumes(p.market, p.timestamp_from, p.timestamp_to, p.interval, p.milliseconds, p.timestamp);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketVolumes error'));
-    }
-  }
-
-  public getBisqMarketHloc(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'market': {
-        required: true,
-        types: ['@string']
-      },
-      'interval': {
-        required: false,
-        types: ['minute', 'half_hour', 'hour', 'half_day', 'day', 'week', 'month', 'year', 'auto']
-      },
-      'timestamp_from': {
-        required: false,
-        types: ['@number']
-      },
-      'timestamp_to': {
-        required: false,
-        types: ['@number']
-      },
-      'milliseconds': {
-        required: false,
-        types: ['@boolean']
-      },
-      'timestamp': {
-        required: false,
-        types: ['no', 'yes']
-      },
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getHloc(p.market, p.interval, p.timestamp_from, p.timestamp_to, p.milliseconds, p.timestamp);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketHloc error'));
-    }
-  }
-
-  public getBisqMarketTicker(req: Request, res: Response) {
-    const constraints: RequiredSpec = {
-      'market': {
-        required: false,
-        types: ['@string']
-      },
-    };
-
-    const p = this.parseRequestParameters(req.query, constraints);
-    if (p.error) {
-      res.status(400).json(this.getBisqMarketErrorResponse(p.error));
-      return;
-    }
-
-    const result = bisqMarket.getTicker(p.market);
-    if (result) {
-      res.json(result);
-    } else {
-      res.status(500).json(this.getBisqMarketErrorResponse('getBisqMarketTicker error'));
-    }
-  }
-
-  private parseRequestParameters(requestParams: object, params: RequiredSpec): { [name: string]: any; } {
-    const final = {};
-    for (const i in params) {
-      if (params.hasOwnProperty(i)) {
-        if (params[i].required && requestParams[i] === undefined) {
-          return { error: i + ' parameter missing'};
-        }
-        if (typeof requestParams[i] === 'string') {
-          const str = (requestParams[i] || '').toString().toLowerCase();
-          if (params[i].types.indexOf('@number') > -1) {
-            const number = parseInt((str).toString(), 10);
-            final[i] = number;
-          } else if (params[i].types.indexOf('@string') > -1) {
-            final[i] = str;
-          } else if (params[i].types.indexOf('@boolean') > -1) {
-            final[i] = str === 'true' || str === 'yes';
-          } else if (params[i].types.indexOf(str) > -1) {
-            final[i] = str;
-          } else {
-            return { error: i + ' parameter invalid'};
-          }
-        } else if (typeof requestParams[i] === 'number') {
-          final[i] = requestParams[i];
-        }
-      }
-    }
-    return final;
-  }
-
-  private getBisqMarketErrorResponse(message: string): MarketsApiError {
-    return {
-      'success': 0,
-      'error': message
-    };
-  }
-
-  public async getTransaction(req: Request, res: Response) {
-    try {
-      const transaction = await transactionUtils.$getTransactionExtended(req.params.txId, false, true);
-
-      if (transaction) {
-        res.json(transaction);
-      } else {
-        res.status(500).send('Error fetching transaction.');
-      }
-    } catch (e) {
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getBlock(req: Request, res: Response) {
-    try {
-      const result = await bitcoinApi.$getBlock(req.params.hash);
-      res.json(result);
-    } catch (e) {
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getBlocks(req: Request, res: Response) {
-    try {
-      loadingIndicators.setProgress('blocks', 0);
-
-      const returnBlocks: IEsploraApi.Block[] = [];
-      const fromHeight = parseInt(req.params.height, 10) || blocks.getCurrentBlockHeight();
-
-      // Check if block height exist in local cache to skip the hash lookup
-      const blockByHeight = blocks.getBlocks().find((b) => b.height === fromHeight);
-      let startFromHash: string | null = null;
-      if (blockByHeight) {
-        startFromHash = blockByHeight.id;
-      } else {
-        startFromHash = await bitcoinApi.$getBlockHash(fromHeight);
-      }
-
-      let nextHash = startFromHash;
-      for (let i = 0; i < 10; i++) {
-        const localBlock = blocks.getBlocks().find((b) => b.id === nextHash);
-        if (localBlock) {
-          returnBlocks.push(localBlock);
-          nextHash = localBlock.previousblockhash;
-        } else {
-          const block = await bitcoinApi.$getBlock(nextHash);
-          returnBlocks.push(block);
-          nextHash = block.previousblockhash;
-        }
-        loadingIndicators.setProgress('blocks', i / 10 * 100);
-      }
-
-      res.json(returnBlocks);
-    } catch (e) {
-      loadingIndicators.setProgress('blocks', 100);
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getBlockTransactions(req: Request, res: Response) {
-    try {
-      loadingIndicators.setProgress('blocktxs-' + req.params.hash, 0);
-
-      const txIds = await bitcoinApi.$getTxIdsForBlock(req.params.hash);
-      const transactions: TransactionExtended[] = [];
-      const startingIndex = Math.max(0, parseInt(req.params.index, 10));
-
-      const endIndex = Math.min(startingIndex + 10, txIds.length);
-      for (let i = startingIndex; i < endIndex; i++) {
-        const transaction = await transactionUtils.$getTransactionExtended(txIds[i], false, true);
-        if (transaction) {
-          transactions.push(transaction);
-          loadingIndicators.setProgress('blocktxs-' + req.params.hash, (i + 1) / endIndex * 100);
-        }
-      }
-      res.json(transactions);
-    } catch (e) {
-      loadingIndicators.setProgress('blocktxs-' + req.params.hash, 100);
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getBlockHeight(req: Request, res: Response) {
-    try {
-      const blockHash = await bitcoinApi.$getBlockHash(parseInt(req.params.height, 10));
-      res.send(blockHash);
-    } catch (e) {
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getAddress(req: Request, res: Response) {
-    if (config.MEMPOOL.BACKEND === 'none') {
-      res.status(405).send('Address lookups cannot be used with bitcoind as backend.');
-      return;
-    }
-
-    try {
-      const addressData = await bitcoinApi.$getAddress(req.params.address);
-      res.json(addressData);
-    } catch (e) {
-      if (e.message && e.message.indexOf('exceeds') > 0) {
-        return res.status(413).send(e.message);
-      }
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getAddressTransactions(req: Request, res: Response) {
-    if (config.MEMPOOL.BACKEND === 'none') {
-      res.status(405).send('Address lookups cannot be used with bitcoind as backend.');
-      return;
-    }
-
-    try {
-      const transactions = await bitcoinApi.$getAddressTransactions(req.params.address, req.params.txId);
-      res.json(transactions);
-    } catch (e) {
-      if (e.message && e.message.indexOf('exceeds') > 0) {
-        return res.status(413).send(e.message);
-      }
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public async getAdressTxChain(req: Request, res: Response) {
-    res.status(501).send('Not implemented');
-  }
-
-  public async getAddressPrefix(req: Request, res: Response) {
-    try {
-      const blockHash = await bitcoinApi.$getAddressPrefix(req.params.prefix);
-      res.send(blockHash);
-    } catch (e) {
-      res.status(500).send(e.message || e);
-    }
-  }
-
-  public getTransactionOutspends(req: Request, res: Response) {
-    res.status(501).send('Not implemented');
-  }
-}
-
-export default new Routes();

backend/src/rpc-api/commands.ts

@@ -0,0 +1,92 @@
+module.exports = {
+  addMultiSigAddress: 'addmultisigaddress',
+  addNode: 'addnode', // bitcoind v0.8.0+
+  backupWallet: 'backupwallet',
+  createMultiSig: 'createmultisig',
+  createRawTransaction: 'createrawtransaction', // bitcoind v0.7.0+
+  decodeRawTransaction: 'decoderawtransaction', // bitcoind v0.7.0+
+  decodeScript: 'decodescript',
+  dumpPrivKey: 'dumpprivkey',
+  dumpWallet: 'dumpwallet', // bitcoind v0.9.0+
+  encryptWallet: 'encryptwallet',
+  estimateFee: 'estimatefee', // bitcoind v0.10.0x
+  estimatePriority: 'estimatepriority', // bitcoind v0.10.0+
+  generate: 'generate', // bitcoind v0.11.0+
+  getAccount: 'getaccount',
+  getAccountAddress: 'getaccountaddress',
+  getAddedNodeInfo: 'getaddednodeinfo', // bitcoind v0.8.0+
+  getAddressesByAccount: 'getaddressesbyaccount',
+  getBalance: 'getbalance',
+  getBestBlockHash: 'getbestblockhash', // bitcoind v0.9.0+
+  getBlock: 'getblock',
+  getBlockStats: 'getblockstats',
+  getBlockFilter: 'getblockfilter',
+  getBlockchainInfo: 'getblockchaininfo', // bitcoind v0.9.2+
+  getBlockCount: 'getblockcount',
+  getBlockHash: 'getblockhash',
+  getBlockHeader: 'getblockheader',
+  getBlockTemplate: 'getblocktemplate', // bitcoind v0.7.0+
+  getChainTips: 'getchaintips', // bitcoind v0.10.0+
+  getChainTxStats: 'getchaintxstats',
+  getConnectionCount: 'getconnectioncount',
+  getDifficulty: 'getdifficulty',
+  getGenerate: 'getgenerate',
+  getInfo: 'getinfo',
+  getMempoolAncestors: 'getmempoolancestors',
+  getMempoolDescendants: 'getmempooldescendants',
+  getMempoolEntry: 'getmempoolentry',
+  getMempoolInfo: 'getmempoolinfo', // bitcoind v0.10+
+  getMiningInfo: 'getmininginfo',
+  getNetTotals: 'getnettotals',
+  getNetworkInfo: 'getnetworkinfo', // bitcoind v0.9.2+
+  getNetworkHashPs: 'getnetworkhashps', // bitcoind v0.9.0+
+  getNewAddress: 'getnewaddress',
+  getPeerInfo: 'getpeerinfo', // bitcoind v0.7.0+
+  getRawChangeAddress: 'getrawchangeaddress', // bitcoin v0.9+
+  getRawMemPool: 'getrawmempool', // bitcoind v0.7.0+
+  getRawTransaction: 'getrawtransaction', // bitcoind v0.7.0+
+  getReceivedByAccount: 'getreceivedbyaccount',
+  getReceivedByAddress: 'getreceivedbyaddress',
+  getTransaction: 'gettransaction',
+  getTxOut: 'gettxout', // bitcoind v0.7.0+
+  getTxOutProof: 'gettxoutproof', // bitcoind v0.11.0+
+  getTxOutSetInfo: 'gettxoutsetinfo', // bitcoind v0.7.0+
+  getUnconfirmedBalance: 'getunconfirmedbalance', // bitcoind v0.9.0+
+  getWalletInfo: 'getwalletinfo', // bitcoind v0.9.2+
+  help: 'help',
+  importAddress: 'importaddress', // bitcoind v0.10.0+
+  importPrivKey: 'importprivkey',
+  importWallet: 'importwallet', // bitcoind v0.9.0+
+  keypoolRefill: 'keypoolrefill',
+  keyPoolRefill: 'keypoolrefill',
+  listAccounts: 'listaccounts',
+  listAddressGroupings: 'listaddressgroupings', // bitcoind v0.7.0+
+  listLockUnspent: 'listlockunspent', // bitcoind v0.8.0+
+  listReceivedByAccount: 'listreceivedbyaccount',
+  listReceivedByAddress: 'listreceivedbyaddress',
+  listSinceBlock: 'listsinceblock',
+  listTransactions: 'listtransactions',
+  listUnspent: 'listunspent', // bitcoind v0.7.0+
+  lockUnspent: 'lockunspent', // bitcoind v0.8.0+
+  move: 'move',
+  ping: 'ping', // bitcoind v0.9.0+
+  prioritiseTransaction: 'prioritisetransaction', // bitcoind v0.10.0+
+  sendFrom: 'sendfrom',
+  sendMany: 'sendmany',
+  sendRawTransaction: 'sendrawtransaction', // bitcoind v0.7.0+
+  sendToAddress: 'sendtoaddress',
+  setAccount: 'setaccount',
+  setGenerate: 'setgenerate',
+  setTxFee: 'settxfee',
+  signMessage: 'signmessage',
+  signRawTransaction: 'signrawtransaction', // bitcoind v0.7.0+
+  stop: 'stop',
+  submitBlock: 'submitblock', // bitcoind v0.7.0+
+  validateAddress: 'validateaddress',
+  verifyChain: 'verifychain', // bitcoind v0.9.0+
+  verifyMessage: 'verifymessage',
+  verifyTxOutProof: 'verifytxoutproof', // bitcoind v0.11.0+
+  walletLock: 'walletlock',
+  walletPassphrase: 'walletpassphrase',
+  walletPassphraseChange: 'walletpassphrasechange'
+}

backend/src/rpc-api/index.ts

@@ -0,0 +1,61 @@
+var commands = require('./commands')
+var rpc = require('./jsonrpc')
+
+// ===----------------------------------------------------------------------===//
+// JsonRPC
+// ===----------------------------------------------------------------------===//
+function Client (opts) {
+  // @ts-ignore
+  this.rpc = new rpc.JsonRPC(opts)
+}
+
+// ===----------------------------------------------------------------------===//
+// cmd
+// ===----------------------------------------------------------------------===//
+Client.prototype.cmd = function () {
+  var args = [].slice.call(arguments)
+  var cmd = args.shift()
+
+  callRpc(cmd, args, this.rpc)
+}
+
+// ===----------------------------------------------------------------------===//
+// callRpc
+// ===----------------------------------------------------------------------===//
+function callRpc (cmd, args, rpc) {
+  var fn = args[args.length - 1]
+
+  // If the last argument is a callback, pop it from the args list
+  if (typeof fn === 'function') {
+    args.pop()
+  } else {
+    fn = function () {}
+  }
+
+  return rpc.call(cmd, args, function () {
+    var args = [].slice.call(arguments)
+      // @ts-ignore
+    args.unshift(null)
+      // @ts-ignore
+    fn.apply(this, args)
+  }, function (err) {
+    fn(err)
+  })
+}
+
+// ===----------------------------------------------------------------------===//
+// Initialize wrappers
+// ===----------------------------------------------------------------------===//
+(function () {
+  for (var protoFn in commands) {
+    (function (protoFn) {
+      Client.prototype[protoFn] = function () {
+        var args = [].slice.call(arguments)
+        return callRpc(commands[protoFn], args, this.rpc)
+      }
+    })(protoFn)
+  }
+})()
+
+// Export!
+module.exports.Client = Client;