//! Structs and traits which allow other parts of rust-lightning to interact with the blockchain.
+use bitcoin::blockdata::block::{Block, BlockHeader};
use bitcoin::blockdata::script::Script;
use bitcoin::blockdata::transaction::TxOut;
use bitcoin::hash_types::{BlockHash, Txid};
pub mod keysinterface;
/// An error when accessing the chain via [`Access`].
-///
-/// [`Access`]: trait.Access.html
#[derive(Clone)]
pub enum AccessError {
/// The requested chain is unknown.
fn get_utxo(&self, genesis_hash: &BlockHash, short_channel_id: u64) -> Result<TxOut, AccessError>;
}
+/// The `Listen` trait is used to be notified of when blocks have been connected or disconnected
+/// from the chain.
+///
+/// Useful when needing to replay chain data upon startup or as new chain events occur.
+pub trait Listen {
+ /// Notifies the listener that a block was added at the given height.
+ fn block_connected(&self, block: &Block, height: u32);
+
+ /// Notifies the listener that a block was removed at the given height.
+ fn block_disconnected(&self, header: &BlockHeader, height: u32);
+}
+
/// The `Watch` trait defines behavior for watching on-chain activity pertaining to channels as
/// blocks are connected and disconnected.
///
/// funds in the channel. See [`ChannelMonitorUpdateErr`] for more details about how to handle
/// multiple instances.
///
-/// [`ChannelMonitor`]: channelmonitor/struct.ChannelMonitor.html
-/// [`ChannelMonitorUpdateErr`]: channelmonitor/enum.ChannelMonitorUpdateErr.html
-/// [`PermanentFailure`]: channelmonitor/enum.ChannelMonitorUpdateErr.html#variant.PermanentFailure
+/// [`ChannelMonitor`]: channelmonitor::ChannelMonitor
+/// [`ChannelMonitorUpdateErr`]: channelmonitor::ChannelMonitorUpdateErr
+/// [`PermanentFailure`]: channelmonitor::ChannelMonitorUpdateErr::PermanentFailure
pub trait Watch<ChannelSigner: Sign>: Send + Sync {
/// Watches a channel identified by `funding_txo` using `monitor`.
///
/// with any spends of outputs returned by [`get_outputs_to_watch`]. In practice, this means
/// calling [`block_connected`] and [`block_disconnected`] on the monitor.
///
- /// [`get_outputs_to_watch`]: channelmonitor/struct.ChannelMonitor.html#method.get_outputs_to_watch
- /// [`block_connected`]: channelmonitor/struct.ChannelMonitor.html#method.block_connected
- /// [`block_disconnected`]: channelmonitor/struct.ChannelMonitor.html#method.block_disconnected
+ /// [`get_outputs_to_watch`]: channelmonitor::ChannelMonitor::get_outputs_to_watch
+ /// [`block_connected`]: channelmonitor::ChannelMonitor::block_connected
+ /// [`block_disconnected`]: channelmonitor::ChannelMonitor::block_disconnected
fn watch_channel(&self, funding_txo: OutPoint, monitor: ChannelMonitor<ChannelSigner>) -> Result<(), ChannelMonitorUpdateErr>;
/// Updates a channel identified by `funding_txo` by applying `update` to its monitor.
/// Implementations must call [`update_monitor`] with the given update. See
/// [`ChannelMonitorUpdateErr`] for invariants around returning an error.
///
- /// [`update_monitor`]: channelmonitor/struct.ChannelMonitor.html#method.update_monitor
- /// [`ChannelMonitorUpdateErr`]: channelmonitor/enum.ChannelMonitorUpdateErr.html
+ /// [`update_monitor`]: channelmonitor::ChannelMonitor::update_monitor
+ /// [`ChannelMonitorUpdateErr`]: channelmonitor::ChannelMonitorUpdateErr
fn update_channel(&self, funding_txo: OutPoint, update: ChannelMonitorUpdate) -> Result<(), ChannelMonitorUpdateErr>;
/// Returns any monitor events since the last call. Subsequent calls must only return new
///
/// Note that use as part of a [`Watch`] implementation involves reentrancy. Therefore, the `Filter`
/// should not block on I/O. Implementations should instead queue the newly monitored data to be
-/// processed later. Then, in order to block until the data has been processed, any `Watch`
+/// processed later. Then, in order to block until the data has been processed, any [`Watch`]
/// invocation that has called the `Filter` must return [`TemporaryFailure`].
///
-/// [`Watch`]: trait.Watch.html
-/// [`TemporaryFailure`]: channelmonitor/enum.ChannelMonitorUpdateErr.html#variant.TemporaryFailure
+/// [`TemporaryFailure`]: channelmonitor::ChannelMonitorUpdateErr::TemporaryFailure
/// [BIP 157]: https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki
/// [BIP 158]: https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki
pub trait Filter: Send + Sync {
/// `script_pubkey` as the spending condition.
fn register_output(&self, outpoint: &OutPoint, script_pubkey: &Script);
}
+
+impl<T: Listen> Listen for std::ops::Deref<Target = T> {
+ fn block_connected(&self, block: &Block, height: u32) {
+ (**self).block_connected(block, height);
+ }
+
+ fn block_disconnected(&self, header: &BlockHeader, height: u32) {
+ (**self).block_disconnected(header, height);
+ }
+}
+
+impl<T: std::ops::Deref, U: std::ops::Deref> Listen for (T, U)
+where
+ T::Target: Listen,
+ U::Target: Listen,
+{
+ fn block_connected(&self, block: &Block, height: u32) {
+ self.0.block_connected(block, height);
+ self.1.block_connected(block, height);
+ }
+
+ fn block_disconnected(&self, header: &BlockHeader, height: u32) {
+ self.0.block_disconnected(header, height);
+ self.1.block_disconnected(header, height);
+ }
+}