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Add a ureq version of esplora module

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The `Blockchain` implementation for connecting to an Esplora instance is
currently based on `reqwest`. Some users may not wish to use reqwest.

`ureq` is a simple HTTP client (no async) that is useful when `reqwest`
is not suitable.

- Move `esplora.rs` -> `esplora/reqwest.rs`
- Add an implementation based on the `reqwest` esplora code but using `ureq`
- Add feature flags and conditional includes to re-export everything to
  the `esplora` module so we don't effect the rest of the code base.
- Remove the forced dependency on `tokio`.
- Make esplora independent of async-interface
- Depend on local version of macros crate
This commit is contained in:
Tobin Harding
2021-06-01 16:36:09 +10:00
parent adceafa40c
commit f37e735b43
12 changed files with 630 additions and 165 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/blockchain/any.rs
View File

@@ -37,9 +37,9 @@
//! )?;
//! # }
//!
//! # #[cfg(feature = "esplora")]
//! # #[cfg(all(feature = "esplora", feature = "ureq"))]
//! # {
//! let esplora_blockchain = EsploraBlockchain::new("...", None, 20);
//! let esplora_blockchain = EsploraBlockchain::new("...", 20);
//! let wallet_esplora: Wallet<AnyBlockchain, _> = Wallet::new(
//! "...",
//! None,
@@ -60,6 +60,8 @@
//! # use bdk::blockchain::*;
//! # use bdk::database::MemoryDatabase;
//! # use bdk::Wallet;
//! # #[cfg(all(feature = "esplora", feature = "ureq"))]
//! # {
//! let config = serde_json::from_str("...")?;
//! let blockchain = AnyBlockchain::from_config(&config)?;
//! let wallet = Wallet::new(
@@ -69,6 +71,7 @@
//! MemoryDatabase::default(),
//! blockchain,
//! )?;
//! # }
//! # Ok::<(), bdk::Error>(())
//! ```

124
src/blockchain/esplora/mod.rs Normal file
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@@ -0,0 +1,124 @@
//! Esplora
//!
//! This module defines a [`EsploraBlockchain`] struct that can query an Esplora
//! backend populate the wallet's [database](crate::database::Database) by:
//!
//! ## Example
//!
//! ```no_run
//! # use bdk::blockchain::esplora::EsploraBlockchain;
//! let blockchain = EsploraBlockchain::new("https://blockstream.info/testnet/api", 20);
//! # Ok::<(), bdk::Error>(())
//! ```
//!
//! Esplora blockchain can use either `ureq` or `reqwest` for the HTTP client
//! depending on your needs (blocking or async respectively).
//!
//! Please note, to configure the Esplora HTTP client correctly use one of:
//! Blocking: --features='esplora,ureq'
//! Async: --features='async-interface,esplora,reqwest' --no-default-features
use std::fmt;
use std::io;
use serde::Deserialize;
use bitcoin::consensus;
use bitcoin::{BlockHash, Txid};
#[cfg(all(
feature = "esplora",
feature = "reqwest",
any(feature = "async-interface", target_arch = "wasm32"),
))]
mod reqwest;
#[cfg(all(
feature = "esplora",
feature = "reqwest",
any(feature = "async-interface", target_arch = "wasm32"),
))]
pub use self::reqwest::*;
#[cfg(all(
feature = "esplora",
not(any(
feature = "async-interface",
feature = "reqwest",
target_arch = "wasm32"
)),
))]
mod ureq;
#[cfg(all(
feature = "esplora",
not(any(
feature = "async-interface",
feature = "reqwest",
target_arch = "wasm32"
)),
))]
pub use self::ureq::*;
/// Data type used when fetching transaction history from Esplora.
#[derive(Deserialize)]
pub struct EsploraGetHistory {
txid: Txid,
status: EsploraGetHistoryStatus,
}
#[derive(Deserialize)]
struct EsploraGetHistoryStatus {
block_height: Option<usize>,
}
/// Errors that can happen during a sync with [`EsploraBlockchain`]
#[derive(Debug)]
pub enum EsploraError {
/// Error during ureq HTTP request
#[cfg(feature = "ureq")]
Ureq(::ureq::Error),
/// Transport error during the ureq HTTP call
#[cfg(feature = "ureq")]
UreqTransport(::ureq::Transport),
/// Error during reqwest HTTP request
#[cfg(feature = "reqwest")]
Reqwest(::reqwest::Error),
/// HTTP response error
HttpResponse(u16),
/// IO error during ureq response read
Io(io::Error),
/// No header found in ureq response
NoHeader,
/// Invalid number returned
Parsing(std::num::ParseIntError),
/// Invalid Bitcoin data returned
BitcoinEncoding(bitcoin::consensus::encode::Error),
/// Invalid Hex data returned
Hex(bitcoin::hashes::hex::Error),
/// Transaction not found
TransactionNotFound(Txid),
/// Header height not found
HeaderHeightNotFound(u32),
/// Header hash not found
HeaderHashNotFound(BlockHash),
}
impl fmt::Display for EsploraError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl std::error::Error for EsploraError {}
#[cfg(feature = "ureq")]
impl_error!(::ureq::Error, Ureq, EsploraError);
#[cfg(feature = "ureq")]
impl_error!(::ureq::Transport, UreqTransport, EsploraError);
#[cfg(feature = "reqwest")]
impl_error!(::reqwest::Error, Reqwest, EsploraError);
impl_error!(io::Error, Io, EsploraError);
impl_error!(std::num::ParseIntError, Parsing, EsploraError);
impl_error!(consensus::encode::Error, BitcoinEncoding, EsploraError);
impl_error!(bitcoin::hashes::hex::Error, Hex, EsploraError);

175
src/blockchain/esplora.rs → src/blockchain/esplora/reqwest.rs
View File

@@ -9,41 +9,30 @@
// You may not use this file except in accordance with one or both of these
// licenses.
//! Esplora
//!
//! This module defines a [`Blockchain`] struct that can query an Esplora backend
//! populate the wallet's [database](crate::database::Database) by
//!
//! ## Example
//!
//! ```no_run
//! # use bdk::blockchain::esplora::EsploraBlockchain;
//! let blockchain = EsploraBlockchain::new("https://blockstream.info/testnet/api", None, 20);
//! # Ok::<(), bdk::Error>(())
//! ```
//! Esplora by way of `reqwest` HTTP client.
use std::collections::{HashMap, HashSet};
use std::fmt;
use bitcoin::consensus::{self, deserialize, serialize};
use bitcoin::consensus::{deserialize, serialize};
use bitcoin::hashes::hex::{FromHex, ToHex};
use bitcoin::hashes::{sha256, Hash};
use bitcoin::{BlockHash, BlockHeader, Script, Transaction, Txid};
use futures::stream::{self, FuturesOrdered, StreamExt, TryStreamExt};
use bitcoin::{BlockHeader, Script, Transaction, Txid};
#[allow(unused_imports)]
use log::{debug, error, info, trace};
use reqwest::{Client, StatusCode};
use serde::Deserialize;
use futures::stream::{self, FuturesOrdered, StreamExt, TryStreamExt};
use ::reqwest::{Client, StatusCode};
use crate::blockchain::esplora::{EsploraError, EsploraGetHistory};
use crate::blockchain::utils::{ElectrumLikeSync, ElsGetHistoryRes};
use crate::blockchain::*;
use crate::database::BatchDatabase;
use crate::error::Error;
use crate::wallet::utils::ChunksIterator;
use crate::FeeRate;
use super::*;
use self::utils::{ElectrumLikeSync, ElsGetHistoryRes};
const DEFAULT_CONCURRENT_REQUESTS: u8 = 4;
#[derive(Debug)]
@@ -75,17 +64,23 @@ impl std::convert::From<UrlClient> for EsploraBlockchain {
}
impl EsploraBlockchain {
/// Create a new instance of the client from a base URL
pub fn new(base_url: &str, concurrency: Option<u8>, stop_gap: usize) -> Self {
/// Create a new instance of the client from a base URL and `stop_gap`.
pub fn new(base_url: &str, stop_gap: usize) -> Self {
EsploraBlockchain {
url_client: UrlClient {
url: base_url.to_string(),
client: Client::new(),
concurrency: concurrency.unwrap_or(DEFAULT_CONCURRENT_REQUESTS),
concurrency: DEFAULT_CONCURRENT_REQUESTS,
},
stop_gap,
}
}
/// Set the concurrency to use when doing batch queries against the Esplora instance.
pub fn with_concurrency(mut self, concurrency: u8) -> Self {
self.url_client.concurrency = concurrency;
self
}
}
#[maybe_async]
@@ -111,19 +106,19 @@ impl Blockchain for EsploraBlockchain {
}
fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error> {
Ok(await_or_block!(self.url_client._get_tx(txid))?)
Ok(self.url_client._get_tx(txid).await?)
}
fn broadcast(&self, tx: &Transaction) -> Result<(), Error> {
Ok(await_or_block!(self.url_client._broadcast(tx))?)
Ok(self.url_client._broadcast(tx).await?)
}
fn get_height(&self) -> Result<u32, Error> {
Ok(await_or_block!(self.url_client._get_height())?)
Ok(self.url_client._get_height().await?)
}
fn estimate_fee(&self, target: usize) -> Result<FeeRate, Error> {
let estimates = await_or_block!(self.url_client._get_fee_estimates())?;
let estimates = self.url_client._get_fee_estimates().await?;
let fee_val = estimates
.into_iter()
@@ -298,74 +293,51 @@ impl ElectrumLikeSync for UrlClient {
&self,
scripts: I,
) -> Result<Vec<Vec<ElsGetHistoryRes>>, Error> {
let future = async {
let mut results = vec![];
for chunk in ChunksIterator::new(scripts.into_iter(), self.concurrency as usize) {
let mut futs = FuturesOrdered::new();
for script in chunk {
futs.push(self._script_get_history(&script));
}
let partial_results: Vec<Vec<ElsGetHistoryRes>> = futs.try_collect().await?;
results.extend(partial_results);
let mut results = vec![];
for chunk in ChunksIterator::new(scripts.into_iter(), self.concurrency as usize) {
let mut futs = FuturesOrdered::new();
for script in chunk {
futs.push(self._script_get_history(script));
}
Ok(stream::iter(results).collect().await)
};
await_or_block!(future)
let partial_results: Vec<Vec<ElsGetHistoryRes>> = futs.try_collect().await?;
results.extend(partial_results);
}
Ok(stream::iter(results).collect().await)
}
fn els_batch_transaction_get<'s, I: IntoIterator<Item = &'s Txid>>(
&self,
txids: I,
) -> Result<Vec<Transaction>, Error> {
let future = async {
let mut results = vec![];
for chunk in ChunksIterator::new(txids.into_iter(), self.concurrency as usize) {
let mut futs = FuturesOrdered::new();
for txid in chunk {
futs.push(self._get_tx_no_opt(&txid));
}
let partial_results: Vec<Transaction> = futs.try_collect().await?;
results.extend(partial_results);
let mut results = vec![];
for chunk in ChunksIterator::new(txids.into_iter(), self.concurrency as usize) {
let mut futs = FuturesOrdered::new();
for txid in chunk {
futs.push(self._get_tx_no_opt(txid));
}
Ok(stream::iter(results).collect().await)
};
await_or_block!(future)
let partial_results: Vec<Transaction> = futs.try_collect().await?;
results.extend(partial_results);
}
Ok(stream::iter(results).collect().await)
}
fn els_batch_block_header<I: IntoIterator<Item = u32>>(
&self,
heights: I,
) -> Result<Vec<BlockHeader>, Error> {
let future = async {
let mut results = vec![];
for chunk in ChunksIterator::new(heights.into_iter(), self.concurrency as usize) {
let mut futs = FuturesOrdered::new();
for height in chunk {
futs.push(self._get_header(height));
}
let partial_results: Vec<BlockHeader> = futs.try_collect().await?;
results.extend(partial_results);
let mut results = vec![];
for chunk in ChunksIterator::new(heights.into_iter(), self.concurrency as usize) {
let mut futs = FuturesOrdered::new();
for height in chunk {
futs.push(self._get_header(height));
}
Ok(stream::iter(results).collect().await)
};
await_or_block!(future)
let partial_results: Vec<BlockHeader> = futs.try_collect().await?;
results.extend(partial_results);
}
Ok(stream::iter(results).collect().await)
}
}
#[derive(Deserialize)]
struct EsploraGetHistoryStatus {
block_height: Option<usize>,
}
#[derive(Deserialize)]
struct EsploraGetHistory {
txid: Txid,
status: EsploraGetHistoryStatus,
}
/// Configuration for an [`EsploraBlockchain`]
#[derive(Debug, serde::Deserialize, serde::Serialize, Clone, PartialEq)]
pub struct EsploraBlockchainConfig {
@@ -375,7 +347,7 @@ pub struct EsploraBlockchainConfig {
pub base_url: String,
/// Number of parallel requests sent to the esplora service (default: 4)
pub concurrency: Option<u8>,
/// Stop searching addresses for transactions after finding an unused gap of this length
/// Stop searching addresses for transactions after finding an unused gap of this length.
pub stop_gap: usize,
}
@@ -383,47 +355,14 @@ impl ConfigurableBlockchain for EsploraBlockchain {
type Config = EsploraBlockchainConfig;
fn from_config(config: &Self::Config) -> Result<Self, Error> {
Ok(EsploraBlockchain::new(
config.base_url.as_str(),
config.concurrency,
config.stop_gap,
))
let mut blockchain = EsploraBlockchain::new(config.base_url.as_str(), config.stop_gap);
if let Some(concurrency) = config.concurrency {
blockchain.url_client.concurrency = concurrency;
};
Ok(blockchain)
}
}
/// Errors that can happen during a sync with [`EsploraBlockchain`]
#[derive(Debug)]
pub enum EsploraError {
/// Error with the HTTP call
Reqwest(reqwest::Error),
/// Invalid number returned
Parsing(std::num::ParseIntError),
/// Invalid Bitcoin data returned
BitcoinEncoding(bitcoin::consensus::encode::Error),
/// Invalid Hex data returned
Hex(bitcoin::hashes::hex::Error),
/// Transaction not found
TransactionNotFound(Txid),
/// Header height not found
HeaderHeightNotFound(u32),
/// Header hash not found
HeaderHashNotFound(BlockHash),
}
impl fmt::Display for EsploraError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl std::error::Error for EsploraError {}
impl_error!(reqwest::Error, Reqwest, EsploraError);
impl_error!(std::num::ParseIntError, Parsing, EsploraError);
impl_error!(consensus::encode::Error, BitcoinEncoding, EsploraError);
impl_error!(bitcoin::hashes::hex::Error, Hex, EsploraError);
#[cfg(test)]
#[cfg(feature = "test-esplora")]
crate::bdk_blockchain_tests! {

391
src/blockchain/esplora/ureq.rs Normal file
View File

@@ -0,0 +1,391 @@
// Bitcoin Dev Kit
// Written in 2020 by Alekos Filini <alekos.filini@gmail.com>
//
// Copyright (c) 2020-2021 Bitcoin Dev Kit Developers
//
// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
// You may not use this file except in accordance with one or both of these
// licenses.
//! Esplora by way of `ureq` HTTP client.
use std::collections::{HashMap, HashSet};
use std::io;
use std::io::Read;
use std::time::Duration;
#[allow(unused_imports)]
use log::{debug, error, info, trace};
use ureq::{Agent, Response};
use bitcoin::consensus::{deserialize, serialize};
use bitcoin::hashes::hex::{FromHex, ToHex};
use bitcoin::hashes::{sha256, Hash};
use bitcoin::{BlockHeader, Script, Transaction, Txid};
use crate::blockchain::esplora::{EsploraError, EsploraGetHistory};
use crate::blockchain::utils::{ElectrumLikeSync, ElsGetHistoryRes};
use crate::blockchain::*;
use crate::database::BatchDatabase;
use crate::error::Error;
use crate::FeeRate;
#[derive(Debug)]
struct UrlClient {
url: String,
agent: Agent,
}
/// Structure that implements the logic to sync with Esplora
///
/// ## Example
/// See the [`blockchain::esplora`](crate::blockchain::esplora) module for a usage example.
#[derive(Debug)]
pub struct EsploraBlockchain {
url_client: UrlClient,
stop_gap: usize,
}
impl std::convert::From<UrlClient> for EsploraBlockchain {
fn from(url_client: UrlClient) -> Self {
EsploraBlockchain {
url_client,
stop_gap: 20,
}
}
}
impl EsploraBlockchain {
/// Create a new instance of the client from a base URL and `stop_gap`.
pub fn new(base_url: &str, stop_gap: usize) -> Self {
EsploraBlockchain {
url_client: UrlClient {
url: base_url.to_string(),
agent: Agent::new(),
},
stop_gap,
}
}
/// Set the inner `ureq` agent.
pub fn with_agent(mut self, agent: Agent) -> Self {
self.url_client.agent = agent;
self
}
}
impl Blockchain for EsploraBlockchain {
fn get_capabilities(&self) -> HashSet<Capability> {
vec![
Capability::FullHistory,
Capability::GetAnyTx,
Capability::AccurateFees,
]
.into_iter()
.collect()
}
fn setup<D: BatchDatabase, P: Progress>(
&self,
database: &mut D,
progress_update: P,
) -> Result<(), Error> {
self.url_client
.electrum_like_setup(self.stop_gap, database, progress_update)
}
fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error> {
Ok(self.url_client._get_tx(txid)?)
}
fn broadcast(&self, tx: &Transaction) -> Result<(), Error> {
let _txid = self.url_client._broadcast(tx)?;
Ok(())
}
fn get_height(&self) -> Result<u32, Error> {
Ok(self.url_client._get_height()?)
}
fn estimate_fee(&self, target: usize) -> Result<FeeRate, Error> {
let estimates = self.url_client._get_fee_estimates()?;
let fee_val = estimates
.into_iter()
.map(|(k, v)| Ok::<_, std::num::ParseIntError>((k.parse::<usize>()?, v)))
.collect::<Result<Vec<_>, _>>()
.map_err(|e| Error::Generic(e.to_string()))?
.into_iter()
.take_while(|(k, _)| k <= &target)
.map(|(_, v)| v)
.last()
.unwrap_or(1.0);
Ok(FeeRate::from_sat_per_vb(fee_val as f32))
}
}
impl UrlClient {
fn script_to_scripthash(script: &Script) -> String {
sha256::Hash::hash(script.as_bytes()).into_inner().to_hex()
}
fn _get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, EsploraError> {
let resp = self
.agent
.get(&format!("{}/tx/{}/raw", self.url, txid))
.call();
match resp {
Ok(resp) => Ok(Some(deserialize(&into_bytes(resp)?)?)),
Err(ureq::Error::Status(code, _)) => {
if is_status_not_found(code) {
return Ok(None);
}
Err(EsploraError::HttpResponse(code))
}
Err(e) => Err(EsploraError::Ureq(e)),
}
}
fn _get_tx_no_opt(&self, txid: &Txid) -> Result<Transaction, EsploraError> {
match self._get_tx(txid) {
Ok(Some(tx)) => Ok(tx),
Ok(None) => Err(EsploraError::TransactionNotFound(*txid)),
Err(e) => Err(e),
}
}
fn _get_header(&self, block_height: u32) -> Result<BlockHeader, EsploraError> {
let resp = self
.agent
.get(&format!("{}/block-height/{}", self.url, block_height))
.call();
let bytes = match resp {
Ok(resp) => Ok(into_bytes(resp)?),
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}?;
let hash = std::str::from_utf8(&bytes)
.map_err(|_| EsploraError::HeaderHeightNotFound(block_height))?;
let resp = self
.agent
.get(&format!("{}/block/{}/header", self.url, hash))
.call();
match resp {
Ok(resp) => Ok(deserialize(&Vec::from_hex(&resp.into_string()?)?)?),
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}
}
fn _broadcast(&self, transaction: &Transaction) -> Result<(), EsploraError> {
let resp = self
.agent
.post(&format!("{}/tx", self.url))
.send_string(&serialize(transaction).to_hex());
match resp {
Ok(_) => Ok(()), // We do not return the txid?
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}
}
fn _get_height(&self) -> Result<u32, EsploraError> {
let resp = self
.agent
.get(&format!("{}/blocks/tip/height", self.url))
.call();
match resp {
Ok(resp) => Ok(resp.into_string()?.parse()?),
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}
}
fn _script_get_history(&self, script: &Script) -> Result<Vec<ElsGetHistoryRes>, EsploraError> {
let mut result = Vec::new();
let scripthash = Self::script_to_scripthash(script);
// Add the unconfirmed transactions first
let resp = self
.agent
.get(&format!(
"{}/scripthash/{}/txs/mempool",
self.url, scripthash
))
.call();
let v = match resp {
Ok(resp) => {
let v: Vec<EsploraGetHistory> = resp.into_json()?;
Ok(v)
}
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}?;
result.extend(v.into_iter().map(|x| ElsGetHistoryRes {
tx_hash: x.txid,
height: x.status.block_height.unwrap_or(0) as i32,
}));
debug!(
"Found {} mempool txs for {} - {:?}",
result.len(),
scripthash,
script
);
// Then go through all the pages of confirmed transactions
let mut last_txid = String::new();
loop {
let resp = self
.agent
.get(&format!(
"{}/scripthash/{}/txs/chain/{}",
self.url, scripthash, last_txid
))
.call();
let v = match resp {
Ok(resp) => {
let v: Vec<EsploraGetHistory> = resp.into_json()?;
Ok(v)
}
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}?;
let len = v.len();
if let Some(elem) = v.last() {
last_txid = elem.txid.to_hex();
}
debug!("... adding {} confirmed transactions", len);
result.extend(v.into_iter().map(|x| ElsGetHistoryRes {
tx_hash: x.txid,
height: x.status.block_height.unwrap_or(0) as i32,
}));
if len < 25 {
break;
}
}
Ok(result)
}
fn _get_fee_estimates(&self) -> Result<HashMap<String, f64>, EsploraError> {
let resp = self
.agent
.get(&format!("{}/fee-estimates", self.url,))
.call();
let map = match resp {
Ok(resp) => {
let map: HashMap<String, f64> = resp.into_json()?;
Ok(map)
}
Err(ureq::Error::Status(code, _)) => Err(EsploraError::HttpResponse(code)),
Err(e) => Err(EsploraError::Ureq(e)),
}?;
Ok(map)
}
}
fn is_status_not_found(status: u16) -> bool {
status == 404
}
fn into_bytes(resp: Response) -> Result<Vec<u8>, io::Error> {
const BYTES_LIMIT: usize = 10 * 1_024 * 1_024;
let mut buf: Vec<u8> = vec![];
resp.into_reader()
.take((BYTES_LIMIT + 1) as u64)
.read_to_end(&mut buf)?;
if buf.len() > BYTES_LIMIT {
return Err(io::Error::new(
io::ErrorKind::Other,
"response too big for into_bytes",
));
}
Ok(buf)
}
impl ElectrumLikeSync for UrlClient {
fn els_batch_script_get_history<'s, I: IntoIterator<Item = &'s Script>>(
&self,
scripts: I,
) -> Result<Vec<Vec<ElsGetHistoryRes>>, Error> {
let mut results = vec![];
for script in scripts.into_iter() {
let v = self._script_get_history(script)?;
results.push(v);
}
Ok(results)
}
fn els_batch_transaction_get<'s, I: IntoIterator<Item = &'s Txid>>(
&self,
txids: I,
) -> Result<Vec<Transaction>, Error> {
let mut results = vec![];
for txid in txids.into_iter() {
let tx = self._get_tx_no_opt(txid)?;
results.push(tx);
}
Ok(results)
}
fn els_batch_block_header<I: IntoIterator<Item = u32>>(
&self,
heights: I,
) -> Result<Vec<BlockHeader>, Error> {
let mut results = vec![];
for height in heights.into_iter() {
let header = self._get_header(height)?;
results.push(header);
}
Ok(results)
}
}
/// Configuration for an [`EsploraBlockchain`]
#[derive(Debug, serde::Deserialize, serde::Serialize, Clone, PartialEq)]
pub struct EsploraBlockchainConfig {
/// Base URL of the esplora service eg. `https://blockstream.info/api/`
pub base_url: String,
/// Socket read timeout.
pub timeout_read: u64,
/// Socket write timeout.
pub timeout_write: u64,
/// Stop searching addresses for transactions after finding an unused gap of this length.
pub stop_gap: usize,
}
impl ConfigurableBlockchain for EsploraBlockchain {
type Config = EsploraBlockchainConfig;
fn from_config(config: &Self::Config) -> Result<Self, Error> {
let agent: Agent = ureq::AgentBuilder::new()
.timeout_read(Duration::from_secs(config.timeout_read))
.timeout_write(Duration::from_secs(config.timeout_write))
.build();
Ok(EsploraBlockchain::new(config.base_url.as_str(), config.stop_gap).with_agent(agent))
}
}