From c39c398f0618835201fb741b1976952c3f9180fa Mon Sep 17 00:00:00 2001 From: Jeffrey Czyz Date: Fri, 17 Nov 2023 17:58:56 -0600 Subject: [PATCH] ChannelManager initialization docs with example --- lightning/src/ln/channelmanager.rs | 71 ++++++++++++++++++++++++++++++ lightning/src/sign/mod.rs | 13 ++++++ 2 files changed, 84 insertions(+) diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs index 3674a1709..35ae80e01 100644 --- a/lightning/src/ln/channelmanager.rs +++ b/lightning/src/ln/channelmanager.rs @@ -1151,6 +1151,77 @@ where /// setups. For instance, on-chain enforcement could be moved to a separate host or have added /// redundancy, possibly as a watchtower. See [`chain::Watch`] for the relevant interface. /// +/// # Initialization +/// +/// Use [`ChannelManager::new`] with the most recent [`BlockHash`] when creating a fresh instance. +/// Otherwise, if restarting, construct [`ChannelManagerReadArgs`] with the necessary parameters and +/// references to any deserialized [`ChannelMonitor`]s that were previously persisted. Use this to +/// deserialize the [`ChannelManager`] and feed it any new chain data since it was last online, as +/// detailed in the [`ChannelManagerReadArgs`] documentation. +/// +/// ``` +/// use bitcoin::BlockHash; +/// use bitcoin::network::constants::Network; +/// use lightning::chain::BestBlock; +/// # use lightning::chain::channelmonitor::ChannelMonitor; +/// use lightning::ln::channelmanager::{ChainParameters, ChannelManager, ChannelManagerReadArgs}; +/// # use lightning::routing::gossip::NetworkGraph; +/// use lightning::util::config::UserConfig; +/// use lightning::util::ser::ReadableArgs; +/// +/// # fn read_channel_monitors() -> Vec> { vec![] } +/// # fn example< +/// # 'a, +/// # L: lightning::util::logger::Logger, +/// # ES: lightning::sign::EntropySource, +/// # S: for <'b> lightning::routing::scoring::LockableScore<'b, ScoreLookUp = SL>, +/// # SL: lightning::routing::scoring::ScoreLookUp, +/// # SP: Sized, +/// # R: lightning::io::Read, +/// # >( +/// # fee_estimator: &dyn lightning::chain::chaininterface::FeeEstimator, +/// # chain_monitor: &dyn lightning::chain::Watch, +/// # tx_broadcaster: &dyn lightning::chain::chaininterface::BroadcasterInterface, +/// # router: &lightning::routing::router::DefaultRouter<&NetworkGraph<&'a L>, &'a L, &ES, &S, SP, SL>, +/// # logger: &L, +/// # entropy_source: &ES, +/// # node_signer: &dyn lightning::sign::NodeSigner, +/// # signer_provider: &lightning::sign::DynSignerProvider, +/// # best_block: lightning::chain::BestBlock, +/// # current_timestamp: u32, +/// # mut reader: R, +/// # ) -> Result<(), lightning::ln::msgs::DecodeError> { +/// // Fresh start with no channels +/// let params = ChainParameters { +/// network: Network::Bitcoin, +/// best_block, +/// }; +/// let default_config = UserConfig::default(); +/// let channel_manager = ChannelManager::new( +/// fee_estimator, chain_monitor, tx_broadcaster, router, logger, entropy_source, node_signer, +/// signer_provider, default_config, params, current_timestamp +/// ); +/// +/// // Restart from deserialized data +/// let mut channel_monitors = read_channel_monitors(); +/// let args = ChannelManagerReadArgs::new( +/// entropy_source, node_signer, signer_provider, fee_estimator, chain_monitor, tx_broadcaster, +/// router, logger, default_config, channel_monitors.iter_mut().collect() +/// ); +/// let (block_hash, channel_manager) = +/// <(BlockHash, ChannelManager<_, _, _, _, _, _, _, _>)>::read(&mut reader, args)?; +/// +/// // Update the ChannelManager and ChannelMonitors with the latest chain data +/// // ... +/// +/// // Move the monitors to the ChannelManager's chain::Watch parameter +/// for monitor in channel_monitors { +/// chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor); +/// } +/// # Ok(()) +/// # } +/// ``` +/// /// # Persistence /// /// Implements [`Writeable`] to write out all channel state to disk. Implies [`peer_disconnected`] for diff --git a/lightning/src/sign/mod.rs b/lightning/src/sign/mod.rs index a7237493b..17a907d19 100644 --- a/lightning/src/sign/mod.rs +++ b/lightning/src/sign/mod.rs @@ -736,6 +736,19 @@ pub trait NodeSigner { fn sign_gossip_message(&self, msg: UnsignedGossipMessage) -> Result; } +// Primarily needed in doctests because of https://github.com/rust-lang/rust/issues/67295 +/// A dynamic [`SignerProvider`] temporarily needed for doc tests. +#[cfg(taproot)] +#[doc(hidden)] +#[deprecated(note = "Remove once taproot cfg is removed")] +pub type DynSignerProvider = dyn SignerProvider; + +/// A dynamic [`SignerProvider`] temporarily needed for doc tests. +#[cfg(not(taproot))] +#[doc(hidden)] +#[deprecated(note = "Remove once taproot cfg is removed")] +pub type DynSignerProvider = dyn SignerProvider; + /// A trait that can return signer instances for individual channels. pub trait SignerProvider { /// A type which implements [`WriteableEcdsaChannelSigner`] which will be returned by [`Self::derive_channel_signer`]. -- 2.39.5