Track in-flight splices for failure reporting and crash recovery

src/builder.rs

@@ -53,6 +53,7 @@ use lightning_dns_resolver::OMDomainResolver;
 use vss_client::headers::VssHeaderProvider;
 
 use crate::chain::ChainSource;
+use crate::channel::SpliceTracker;
 #[cfg(feature = "chain-bitcoind")]
 use crate::config::BitcoindRestClientConfig;
 use crate::config::{
@@ -2500,6 +2501,13 @@ fn build_with_store_internal(
 		})
 	});
 
+	let splice_tracker = Arc::new(SpliceTracker::new(
+		Arc::clone(&channel_manager),
+		Arc::clone(&wallet),
+		Arc::clone(&pending_payment_store),
+		Arc::clone(&logger),
+	));
+
 	#[cfg(cycle_tests)]
 	let mut _leak_checker = crate::LeakChecker(Vec::new());
 	#[cfg(cycle_tests)]
@@ -2551,6 +2559,7 @@ fn build_with_store_internal(
 		payment_store,
 		forwarding_store,
 		forwarded_payment_aggregation_retention_secs,
+		splice_tracker,
 		lnurl_auth,
 		is_running,
 		node_metrics,

src/chain/mod.rs

@@ -37,9 +37,15 @@ use crate::config::{BackgroundSyncConfig, Config, WALLET_SYNC_INTERVAL_MINIMUM_S
 use crate::fee_estimator::OnchainFeeEstimator;
 use crate::logger::{log_debug, log_error, log_info, log_trace, LdkLogger, Logger};
 use crate::runtime::Runtime;
+use crate::tx_broadcaster::BroadcastPackage;
 use crate::types::{Broadcaster, ChainMonitor, ChannelManager, DynStore, Sweeper, Wallet};
 use crate::{Error, PersistedNodeMetrics};
 
+/// How long to wait before re-classifying a package whose classification failed. Long enough to
+/// give a struggling store room to recover, short against the ~minutes until the transaction
+/// could confirm.
+pub(crate) const FAILED_CLASSIFY_RETRY_DELAY: Duration = Duration::from_secs(2);
+
 /// We use this parent-child TRUC package to make sure the configured chain source supports
 /// broadcasting packages via the `submitpackage` Bitcoin Core RPC.
 const PARENT_TXID: &str = "9a015f93fac6cb203c2b994e18b85176eb0354a22a468255516f3c6002d3f696";
@@ -562,51 +568,62 @@ impl ChainSource {
 		}
 	}
 
+	/// Classifies the package's funding broadcasts into payment records, then broadcasts it.
+	/// Returns the package back on classification failure so the caller can retry it after a
+	/// delay: broadcasting a tx we failed to record would leave it on-chain without a payment,
+	/// while dropping the package would keep a funding transaction off-chain until LDK re-hands
+	/// it when the channel next resumes — no timer re-broadcasts it, and the wallet's tip-change
+	/// re-broadcast covers recorded transactions only.
+	async fn classify_and_broadcast(
+		&self, package: BroadcastPackage,
+	) -> Result<(), BroadcastPackage> {
+		if let Err(e) = self.tx_broadcaster.classify_package(&package).await {
+			log_error!(
+				self.logger,
+				"Delaying broadcast: failed to persist payment records, will retry: {:?}",
+				e,
+			);
+			return Err(package);
+		}
+		let package = package.into_sorted_transactions();
+		match &self.kind {
+			#[cfg(feature = "chain-esplora")]
+			ChainSourceKind::Esplora(esplora_chain_source) => {
+				esplora_chain_source.process_transaction_broadcast(package).await
+			},
+			#[cfg(feature = "chain-electrum")]
+			ChainSourceKind::Electrum(electrum_chain_source) => {
+				electrum_chain_source.process_transaction_broadcast(package).await
+			},
+			#[cfg(feature = "chain-bitcoind")]
+			ChainSourceKind::Bitcoind(bitcoind_chain_source) => {
+				bitcoind_chain_source.process_transaction_broadcast(package).await
+			},
+		}
+		Ok(())
+	}
+
 	pub(crate) async fn continuously_process_broadcast_queue(
 		&self, mut stop_tx_bcast_receiver: tokio::sync::watch::Receiver<()>,
 	) {
-		let mut receiver = self.tx_broadcaster.get_broadcast_queue().await;
 		loop {
-			let tx_bcast_logger = Arc::clone(&self.logger);
-			tokio::select! {
+			let package = tokio::select! {
+				// A stop request is polled first, so a queue that always has a package ready
+				// cannot starve it. Which package comes next — a fresh one before a due retry —
+				// is decided in `BroadcastQueue::next`.
+				biased;
 				_ = stop_tx_bcast_receiver.changed() => {
 					log_debug!(
-						tx_bcast_logger,
+						self.logger,
 						"Stopping broadcasting transactions.",
 					);
 					return;
 				}
-				Some(next_package) = receiver.recv() => {
-					// Classify funding broadcasts into payment records before sending. If
-					// classification fails we skip the broadcast, since broadcasting a tx we
-					// failed to record would leave it on-chain without a payment.
-					let package = match self.tx_broadcaster.classify_package(next_package).await {
-						Ok(package) => package,
-						Err(e) => {
-							log_error!(
-								tx_bcast_logger,
-								"Skipping broadcast: failed to persist payment records: {:?}",
-								e,
-							);
-							continue;
-						},
-					};
-					let package = package.into_sorted_transactions();
-					match &self.kind {
-						#[cfg(feature = "chain-esplora")]
-						ChainSourceKind::Esplora(esplora_chain_source) => {
-							esplora_chain_source.process_transaction_broadcast(package).await
-						},
-						#[cfg(feature = "chain-electrum")]
-						ChainSourceKind::Electrum(electrum_chain_source) => {
-							electrum_chain_source.process_transaction_broadcast(package).await
-						},
-						#[cfg(feature = "chain-bitcoind")]
-						ChainSourceKind::Bitcoind(bitcoind_chain_source) => {
-							bitcoind_chain_source.process_transaction_broadcast(package).await
-						},
-					}
-				}
+				package = self.tx_broadcaster.next_package() => package,
+			};
+			if let Err(package) = self.classify_and_broadcast(package).await {
+				let retry_at = tokio::time::Instant::now() + FAILED_CLASSIFY_RETRY_DELAY;
+				self.tx_broadcaster.retry_package(package, retry_at);
 			}
 		}
 	}