Our features are a bit convoluted, most annoyingly we cannot build with
`--all-features`. However we can make life for users a little easier.
Explicitly we want users to be able to:
- Use async-interface/WASM without using esplora (to implement their own blockchain)
- Use esplora in an ergonomic manner
Currently using esplora requires either reqwest or ureq. Instead of
making the user add all the features manually we can add features that
add the required feature sets, this makes it easier for users to
understand what is required and also makes usage easier.
With this patch applied we can do
- `cargo check --no-default-features --features=use-esplora-reqwest`
- `cargo check --no-default-features --features=use-esplora-ureq`
- `cargo check --features=use-esplora-ureq`
- `cargo check --no-default-features --features=async-trait`
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
Verify the unconfirmed transactions we download against the consensus
rules. This is currently exposed as an extra `verify` feature, since it
depends on a pre-release version of `bitcoinconsensus`.
Closes#352
