Merge pull request #3033 from TheBlueMatt/2024-04-notify-bp-on-blocks

Wake `background-processor` from `ChainMonitor` on new blocks

lightning/src/chain/chainmonitor.rs

@@ -296,6 +296,8 @@ pub struct ChainMonitor<ChannelSigner: WriteableEcdsaChannelSigner, C: Deref, T:
 	/// The best block height seen, used as a proxy for the passage of time.
 	highest_chain_height: AtomicUsize,
 
+	/// A [`Notifier`] used to wake up the background processor in case we have any [`Event`]s for
+	/// it to give to users (or [`MonitorEvent`]s for `ChannelManager` to process).
 	event_notifier: Notifier,
 }
 
@@ -738,6 +740,8 @@ where
 			monitor.block_connected(
 				header, txdata, height, &*self.broadcaster, &*self.fee_estimator, &self.logger)
 		});
+		// Assume we may have some new events and wake the event processor
+		self.event_notifier.notify();
 	}
 
 	fn block_disconnected(&self, header: &Header, height: u32) {
@@ -765,6 +769,8 @@ where
 			monitor.transactions_confirmed(
 				header, txdata, height, &*self.broadcaster, &*self.fee_estimator, &self.logger)
 		});
+		// Assume we may have some new events and wake the event processor
+		self.event_notifier.notify();
 	}
 
 	fn transaction_unconfirmed(&self, txid: &Txid) {
@@ -785,6 +791,8 @@ where
 				header, height, &*self.broadcaster, &*self.fee_estimator, &self.logger
 			)
 		});
+		// Assume we may have some new events and wake the event processor
+		self.event_notifier.notify();
 	}
 
 	fn get_relevant_txids(&self) -> Vec<(Txid, u32, Option<BlockHash>)> {