LSPS5 implementation

lightning-background-processor/Cargo.toml

@@ -14,9 +14,10 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
+default = ["std", "time"]
 std = ["lightning/std", "lightning-liquidity/std", "bitcoin-io/std", "bitcoin_hashes/std"]
+time = ["std", "lightning-liquidity/time"]
 
-default = ["std"]
 
 [dependencies]
 bitcoin = { version = "0.32.2", default-features = false }

lightning-background-processor/src/lib.rs

@@ -648,6 +648,7 @@ use futures_util::{dummy_waker, OptionalSelector, Selector, SelectorOutput};
 /// # use std::sync::atomic::{AtomicBool, Ordering};
 /// # use std::time::SystemTime;
 /// # use lightning_background_processor::{process_events_async, GossipSync};
+/// # use lightning_liquidity::lsps5::service::TimeProvider;
 /// # struct Logger {}
 /// # impl lightning::util::logger::Logger for Logger {
 /// #     fn log(&self, _record: lightning::util::logger::Record) {}
@@ -659,6 +660,16 @@ use futures_util::{dummy_waker, OptionalSelector, Selector, SelectorOutput};
 /// #     fn remove(&self, primary_namespace: &str, secondary_namespace: &str, key: &str, lazy: bool) -> io::Result<()> { Ok(()) }
 /// #     fn list(&self, primary_namespace: &str, secondary_namespace: &str) -> io::Result<Vec<String>> { Ok(Vec::new()) }
 /// # }
+/// #
+/// # use core::time::Duration;
+/// # struct DefaultTimeProvider;
+/// #
+/// # impl TimeProvider for DefaultTimeProvider {
+/// #    fn duration_since_epoch(&self) -> Duration {
+/// #        use std::time::{SystemTime, UNIX_EPOCH};
+/// #        SystemTime::now().duration_since(UNIX_EPOCH).expect("system time before Unix epoch")
+/// #    }
+/// # }
 /// # struct EventHandler {}
 /// # impl EventHandler {
 /// #     async fn handle_event(&self, _: lightning::events::Event) -> Result<(), ReplayEvent> { Ok(()) }
@@ -674,7 +685,7 @@ use futures_util::{dummy_waker, OptionalSelector, Selector, SelectorOutput};
 /// # type P2PGossipSync<UL> = lightning::routing::gossip::P2PGossipSync<Arc<NetworkGraph>, Arc<UL>, Arc<Logger>>;
 /// # type ChannelManager<B, F, FE> = lightning::ln::channelmanager::SimpleArcChannelManager<ChainMonitor<B, F, FE>, B, FE, Logger>;
 /// # type OnionMessenger<B, F, FE> = lightning::onion_message::messenger::OnionMessenger<Arc<lightning::sign::KeysManager>, Arc<lightning::sign::KeysManager>, Arc<Logger>, Arc<ChannelManager<B, F, FE>>, Arc<lightning::onion_message::messenger::DefaultMessageRouter<Arc<NetworkGraph>, Arc<Logger>, Arc<lightning::sign::KeysManager>>>, Arc<ChannelManager<B, F, FE>>, lightning::ln::peer_handler::IgnoringMessageHandler, lightning::ln::peer_handler::IgnoringMessageHandler, lightning::ln::peer_handler::IgnoringMessageHandler>;
-/// # type LiquidityManager<B, F, FE> = lightning_liquidity::LiquidityManager<Arc<lightning::sign::KeysManager>, Arc<ChannelManager<B, F, FE>>, Arc<F>>;
+/// # type LiquidityManager<B, F, FE> = lightning_liquidity::LiquidityManager<Arc<lightning::sign::KeysManager>, Arc<ChannelManager<B, F, FE>>, Arc<F>, Arc<DefaultTimeProvider>>;
 /// # type Scorer = RwLock<lightning::routing::scoring::ProbabilisticScorer<Arc<NetworkGraph>, Arc<Logger>>>;
 /// # type PeerManager<B, F, FE, UL> = lightning::ln::peer_handler::SimpleArcPeerManager<SocketDescriptor, ChainMonitor<B, F, FE>, B, FE, Arc<UL>, Logger, F, Store>;
 /// #
@@ -1151,7 +1162,7 @@ impl Drop for BackgroundProcessor {
 	}
 }
 
-#[cfg(all(feature = "std", test))]
+#[cfg(all(feature = "std", feature = "time", test))]
 mod tests {
 	use super::{BackgroundProcessor, GossipSync, FRESHNESS_TIMER};
 	use bitcoin::constants::{genesis_block, ChainHash};
@@ -1196,6 +1207,8 @@ mod tests {
 	use lightning::util::sweep::{OutputSpendStatus, OutputSweeperSync, PRUNE_DELAY_BLOCKS};
 	use lightning::util::test_utils;
 	use lightning::{get_event, get_event_msg};
+	#[cfg(feature = "time")]
+	use lightning_liquidity::lsps5::service::DefaultTimeProvider;
 	use lightning_liquidity::LiquidityManager;
 	use lightning_persister::fs_store::FilesystemStore;
 	use lightning_rapid_gossip_sync::RapidGossipSync;
@@ -1292,8 +1305,12 @@ mod tests {
 		IgnoringMessageHandler,
 	>;
 
-	type LM =
-		LiquidityManager<Arc<KeysManager>, Arc<ChannelManager>, Arc<dyn Filter + Sync + Send>>;
+	type LM = LiquidityManager<
+		Arc<KeysManager>,
+		Arc<ChannelManager>,
+		Arc<dyn Filter + Sync + Send>,
+		Arc<DefaultTimeProvider>,
+	>;
 
 	struct Node {
 		node: Arc<ChannelManager>,

lightning-liquidity/Cargo.toml

@@ -14,8 +14,9 @@ categories = ["cryptography::cryptocurrencies"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["std"]
+default = ["std", "time"]
 std = ["lightning/std"]
+time = ["std"]
 backtrace = ["dep:backtrace"]
 
 [dependencies]

lightning-liquidity/src/events/mod.rs

@@ -23,6 +23,7 @@ pub use event_queue::MAX_EVENT_QUEUE_SIZE;
 use crate::lsps0;
 use crate::lsps1;
 use crate::lsps2;
+use crate::lsps5;
 
 /// An event which you should probably take some action in response to.
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -38,6 +39,10 @@ pub enum LiquidityEvent {
 	LSPS2Client(lsps2::event::LSPS2ClientEvent),
 	/// An LSPS2 (JIT Channel) server event.
 	LSPS2Service(lsps2::event::LSPS2ServiceEvent),
+	/// An LSPS5 (Webhook) client event.
+	LSPS5Client(lsps5::event::LSPS5ClientEvent),
+	/// An LSPS5 (Webhook) server event.
+	LSPS5Service(lsps5::event::LSPS5ServiceEvent),
 }
 
 impl From<lsps0::event::LSPS0ClientEvent> for LiquidityEvent {
@@ -70,3 +75,15 @@ impl From<lsps2::event::LSPS2ServiceEvent> for LiquidityEvent {
 		Self::LSPS2Service(event)
 	}
 }
+
+impl From<lsps5::event::LSPS5ClientEvent> for LiquidityEvent {
+	fn from(event: lsps5::event::LSPS5ClientEvent) -> Self {
+		Self::LSPS5Client(event)
+	}
+}
+
+impl From<lsps5::event::LSPS5ServiceEvent> for LiquidityEvent {
+	fn from(event: lsps5::event::LSPS5ServiceEvent) -> Self {
+		Self::LSPS5Service(event)
+	}
+}

lightning-liquidity/src/lib.rs

@@ -23,6 +23,8 @@
 //! an LSP will open a "just-in-time" channel. This is useful for the initial on-boarding of
 //! clients as the channel opening fees are deducted from the incoming payment, i.e., no funds are
 //! required client-side to initiate this flow.
+//! - [bLIP-55 / LSPS5] defines a protocol for sending webhook notifications to clients. This is
+//! useful for notifying clients about incoming payments, channel expiries, etc.
 //!
 //! To get started, you'll want to setup a [`LiquidityManager`] and configure it to be the
 //! [`CustomMessageHandler`] of your LDK node. You can then for example call
@@ -37,6 +39,7 @@
 //! [bLIP-50 / LSPS0]: https://github.com/lightning/blips/blob/master/blip-0050.md
 //! [bLIP-51 / LSPS1]: https://github.com/lightning/blips/blob/master/blip-0051.md
 //! [bLIP-52 / LSPS2]: https://github.com/lightning/blips/blob/master/blip-0052.md
+//! [bLIP-55 / LSPS5]: https://github.com/lightning/blips/pull/55/files
 //! [`CustomMessageHandler`]: lightning::ln::peer_handler::CustomMessageHandler
 //! [`LiquidityManager::next_event`]: crate::LiquidityManager::next_event
 #![deny(missing_docs)]
@@ -59,6 +62,7 @@ pub mod events;
 pub mod lsps0;
 pub mod lsps1;
 pub mod lsps2;
+pub mod lsps5;
 mod manager;
 pub mod message_queue;
 #[allow(dead_code)]

lightning-liquidity/src/lsps0/msgs.rs

@@ -83,6 +83,7 @@ impl TryFrom<LSPSMessage> for LSPS0Message {
 			LSPSMessage::LSPS0(message) => Ok(message),
 			LSPSMessage::LSPS1(_) => Err(()),
 			LSPSMessage::LSPS2(_) => Err(()),
+			LSPSMessage::LSPS5(_) => Err(()),
 		}
 	}
 }