3f5cb6997f
Blockchain calls sync logic rather than the other way around. Sync logic is captured in script_sync.rs.
256 lines
8.7 KiB
Rust
256 lines
8.7 KiB
Rust
// Bitcoin Dev Kit
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// Written in 2020 by Alekos Filini <alekos.filini@gmail.com>
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//
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// Copyright (c) 2020-2021 Bitcoin Dev Kit Developers
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//
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// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
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// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
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// You may not use this file except in accordance with one or both of these
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// licenses.
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//! Blockchain backends
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//!
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//! This module provides the implementation of a few commonly-used backends like
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//! [Electrum](crate::blockchain::electrum), [Esplora](crate::blockchain::esplora) and
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//! [Compact Filters/Neutrino](crate::blockchain::compact_filters), along with a generalized trait
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//! [`Blockchain`] that can be implemented to build customized backends.
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use std::collections::HashSet;
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use std::ops::Deref;
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use std::sync::mpsc::{channel, Receiver, Sender};
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use std::sync::Arc;
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use bitcoin::{Transaction, Txid};
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use crate::database::BatchDatabase;
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use crate::error::Error;
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use crate::FeeRate;
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#[cfg(any(
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feature = "electrum",
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feature = "esplora",
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feature = "compact_filters",
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feature = "rpc"
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))]
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pub mod any;
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mod script_sync;
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#[cfg(any(
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feature = "electrum",
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feature = "esplora",
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feature = "compact_filters",
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feature = "rpc"
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))]
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pub use any::{AnyBlockchain, AnyBlockchainConfig};
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#[cfg(feature = "electrum")]
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#[cfg_attr(docsrs, doc(cfg(feature = "electrum")))]
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pub mod electrum;
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#[cfg(feature = "electrum")]
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pub use self::electrum::ElectrumBlockchain;
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#[cfg(feature = "electrum")]
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pub use self::electrum::ElectrumBlockchainConfig;
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#[cfg(feature = "rpc")]
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#[cfg_attr(docsrs, doc(cfg(feature = "rpc")))]
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pub mod rpc;
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#[cfg(feature = "rpc")]
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pub use self::rpc::RpcBlockchain;
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#[cfg(feature = "rpc")]
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pub use self::rpc::RpcConfig;
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#[cfg(feature = "esplora")]
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#[cfg_attr(docsrs, doc(cfg(feature = "esplora")))]
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pub mod esplora;
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#[cfg(feature = "esplora")]
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pub use self::esplora::EsploraBlockchain;
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#[cfg(feature = "compact_filters")]
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#[cfg_attr(docsrs, doc(cfg(feature = "compact_filters")))]
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pub mod compact_filters;
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#[cfg(feature = "compact_filters")]
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pub use self::compact_filters::CompactFiltersBlockchain;
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/// Capabilities that can be supported by a [`Blockchain`] backend
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum Capability {
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/// Can recover the full history of a wallet and not only the set of currently spendable UTXOs
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FullHistory,
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/// Can fetch any historical transaction given its txid
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GetAnyTx,
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/// Can compute accurate fees for the transactions found during sync
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AccurateFees,
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}
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/// Trait that defines the actions that must be supported by a blockchain backend
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#[maybe_async]
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pub trait Blockchain {
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/// Return the set of [`Capability`] supported by this backend
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fn get_capabilities(&self) -> HashSet<Capability>;
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/// Setup the backend and populate the internal database for the first time
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///
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/// This method is the equivalent of [`Blockchain::sync`], but it's guaranteed to only be
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/// called once, at the first [`Wallet::sync`](crate::wallet::Wallet::sync).
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///
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/// The rationale behind the distinction between `sync` and `setup` is that some custom backends
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/// might need to perform specific actions only the first time they are synced.
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///
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/// For types that do not have that distinction, only this method can be implemented, since
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/// [`Blockchain::sync`] defaults to calling this internally if not overridden.
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fn setup<D: BatchDatabase, P: 'static + Progress>(
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&self,
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database: &mut D,
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progress_update: P,
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) -> Result<(), Error>;
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/// Populate the internal database with transactions and UTXOs
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///
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/// If not overridden, it defaults to calling [`Blockchain::setup`] internally.
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///
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/// This method should implement the logic required to iterate over the list of the wallet's
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/// script_pubkeys using [`Database::iter_script_pubkeys`] and look for relevant transactions
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/// in the blockchain to populate the database with [`BatchOperations::set_tx`] and
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/// [`BatchOperations::set_utxo`].
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///
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/// This method should also take care of removing UTXOs that are seen as spent in the
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/// blockchain, using [`BatchOperations::del_utxo`].
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///
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/// The `progress_update` object can be used to give the caller updates about the progress by using
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/// [`Progress::update`].
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///
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/// [`Database::iter_script_pubkeys`]: crate::database::Database::iter_script_pubkeys
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/// [`BatchOperations::set_tx`]: crate::database::BatchOperations::set_tx
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/// [`BatchOperations::set_utxo`]: crate::database::BatchOperations::set_utxo
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/// [`BatchOperations::del_utxo`]: crate::database::BatchOperations::del_utxo
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fn sync<D: BatchDatabase, P: 'static + Progress>(
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&self,
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database: &mut D,
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progress_update: P,
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) -> Result<(), Error> {
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maybe_await!(self.setup(database, progress_update))
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}
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/// Fetch a transaction from the blockchain given its txid
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fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error>;
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/// Broadcast a transaction
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fn broadcast(&self, tx: &Transaction) -> Result<(), Error>;
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/// Return the current height
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fn get_height(&self) -> Result<u32, Error>;
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/// Estimate the fee rate required to confirm a transaction in a given `target` of blocks
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fn estimate_fee(&self, target: usize) -> Result<FeeRate, Error>;
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}
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/// Trait for [`Blockchain`] types that can be created given a configuration
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pub trait ConfigurableBlockchain: Blockchain + Sized {
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/// Type that contains the configuration
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type Config: std::fmt::Debug;
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/// Create a new instance given a configuration
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fn from_config(config: &Self::Config) -> Result<Self, Error>;
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}
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/// Data sent with a progress update over a [`channel`]
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pub type ProgressData = (f32, Option<String>);
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/// Trait for types that can receive and process progress updates during [`Blockchain::sync`] and
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/// [`Blockchain::setup`]
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pub trait Progress: Send {
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/// Send a new progress update
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///
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/// The `progress` value should be in the range 0.0 - 100.0, and the `message` value is an
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/// optional text message that can be displayed to the user.
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fn update(&self, progress: f32, message: Option<String>) -> Result<(), Error>;
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}
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/// Shortcut to create a [`channel`] (pair of [`Sender`] and [`Receiver`]) that can transport [`ProgressData`]
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pub fn progress() -> (Sender<ProgressData>, Receiver<ProgressData>) {
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channel()
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}
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impl Progress for Sender<ProgressData> {
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fn update(&self, progress: f32, message: Option<String>) -> Result<(), Error> {
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if !(0.0..=100.0).contains(&progress) {
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return Err(Error::InvalidProgressValue(progress));
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}
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self.send((progress, message))
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.map_err(|_| Error::ProgressUpdateError)
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}
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}
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/// Type that implements [`Progress`] and drops every update received
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#[derive(Clone, Copy)]
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pub struct NoopProgress;
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/// Create a new instance of [`NoopProgress`]
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pub fn noop_progress() -> NoopProgress {
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NoopProgress
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}
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impl Progress for NoopProgress {
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fn update(&self, _progress: f32, _message: Option<String>) -> Result<(), Error> {
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Ok(())
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}
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}
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/// Type that implements [`Progress`] and logs at level `INFO` every update received
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#[derive(Clone, Copy)]
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pub struct LogProgress;
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/// Create a new instance of [`LogProgress`]
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pub fn log_progress() -> LogProgress {
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LogProgress
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}
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impl Progress for LogProgress {
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fn update(&self, progress: f32, message: Option<String>) -> Result<(), Error> {
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log::info!(
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"Sync {:.3}%: `{}`",
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progress,
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message.unwrap_or_else(|| "".into())
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);
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Ok(())
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}
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}
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#[maybe_async]
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impl<T: Blockchain> Blockchain for Arc<T> {
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fn get_capabilities(&self) -> HashSet<Capability> {
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maybe_await!(self.deref().get_capabilities())
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}
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fn setup<D: BatchDatabase, P: 'static + Progress>(
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&self,
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database: &mut D,
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progress_update: P,
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) -> Result<(), Error> {
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maybe_await!(self.deref().setup(database, progress_update))
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}
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fn sync<D: BatchDatabase, P: 'static + Progress>(
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&self,
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database: &mut D,
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progress_update: P,
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) -> Result<(), Error> {
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maybe_await!(self.deref().sync(database, progress_update))
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}
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fn get_tx(&self, txid: &Txid) -> Result<Option<Transaction>, Error> {
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maybe_await!(self.deref().get_tx(txid))
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}
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fn broadcast(&self, tx: &Transaction) -> Result<(), Error> {
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maybe_await!(self.deref().broadcast(tx))
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}
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fn get_height(&self) -> Result<u32, Error> {
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maybe_await!(self.deref().get_height())
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}
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fn estimate_fee(&self, target: usize) -> Result<FeeRate, Error> {
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maybe_await!(self.deref().estimate_fee(target))
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}
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}
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