X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fchain%2Fmod.rs;h=7d410b9b71dd116cbe22d2858e9664ec6bc14381;hb=e44713190a090156e4bffac518dad98574e411be;hp=af3fbea44f84856d4d7b4aada676db3a52513f96;hpb=2342550af5325fb7a16b232fe56c4f1cbce1c295;p=rust-lightning diff --git a/lightning/src/chain/mod.rs b/lightning/src/chain/mod.rs index af3fbea4..7d410b9b 100644 --- a/lightning/src/chain/mod.rs +++ b/lightning/src/chain/mod.rs @@ -9,12 +9,13 @@ //! 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}; use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr, MonitorEvent}; -use chain::keysinterface::ChannelKeys; +use chain::keysinterface::Sign; use chain::transaction::OutPoint; pub mod chaininterface; @@ -24,8 +25,6 @@ pub mod transaction; 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. @@ -46,6 +45,18 @@ pub trait Access: Send + Sync { fn get_utxo(&self, genesis_hash: &BlockHash, short_channel_id: u64) -> Result; } +/// 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. /// @@ -64,31 +75,28 @@ pub trait Access: Send + Sync { /// 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 -pub trait Watch: Send + Sync { - /// Keys needed by monitors for creating and signing transactions. - type Keys: ChannelKeys; - +/// [`ChannelMonitor`]: channelmonitor::ChannelMonitor +/// [`ChannelMonitorUpdateErr`]: channelmonitor::ChannelMonitorUpdateErr +/// [`PermanentFailure`]: channelmonitor::ChannelMonitorUpdateErr::PermanentFailure +pub trait Watch: Send + Sync { /// Watches a channel identified by `funding_txo` using `monitor`. /// /// Implementations are responsible for watching the chain for the funding transaction along /// 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 - fn watch_channel(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr>; + /// [`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) -> 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 @@ -110,11 +118,10 @@ pub trait Watch: Send + Sync { /// /// 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 { @@ -126,3 +133,29 @@ pub trait Filter: Send + Sync { /// `script_pubkey` as the spending condition. fn register_output(&self, outpoint: &OutPoint, script_pubkey: &Script); } + +impl Listen for std::ops::Deref { + 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 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); + } +}