Update LDK, fixing a circular Arc reference in gossip validation

LDK's gossip validation API basically forced us to have a circular
`Arc` reference, leading to memory leaks after `drop`ping an
instance of `Node`. This is fixed upstream in LDK PR #4294 which we
update to here.

Author: TheBlueMatt

src/builder.rs

@@ -1474,8 +1474,12 @@ fn build_with_store_internal(
 
 	let gossip_source = match gossip_source_config {
 		GossipSourceConfig::P2PNetwork => {
-			let p2p_source =
-				Arc::new(GossipSource::new_p2p(Arc::clone(&network_graph), Arc::clone(&logger)));
+			let p2p_source = Arc::new(GossipSource::new_p2p(
+				Arc::clone(&network_graph),
+				Arc::clone(&chain_source),
+				Arc::clone(&runtime),
+				Arc::clone(&logger),
+			));
 
 			// Reset the RGS sync timestamp in case we somehow switch gossip sources
 			{
@@ -1596,12 +1600,6 @@ fn build_with_store_internal(
 
 	liquidity_source.as_ref().map(|l| l.set_peer_manager(Arc::downgrade(&peer_manager)));
 
-	gossip_source.set_gossip_verifier(
-		Arc::clone(&chain_source),
-		Arc::clone(&peer_manager),
-		Arc::clone(&runtime),
-	);
-
 	let connection_manager =
 		Arc::new(ConnectionManager::new(Arc::clone(&peer_manager), Arc::clone(&logger)));
 

src/gossip.rs

@@ -33,11 +33,21 @@ pub(crate) enum GossipSource {
 }
 
 impl GossipSource {
-	pub fn new_p2p(network_graph: Arc<Graph>, logger: Arc<Logger>) -> Self {
+	pub fn new_p2p(
+		network_graph: Arc<Graph>, chain_source: Arc<ChainSource>, runtime: Arc<Runtime>,
+		logger: Arc<Logger>,
+	) -> Self {
+		let verifier = chain_source.as_utxo_source().map(|utxo_source| {
+			Arc::new(GossipVerifier::new(
+				Arc::new(utxo_source),
+				RuntimeSpawner::new(runtime),
+			))
+		});
+
 		let gossip_sync = Arc::new(P2PGossipSync::new(
 			network_graph,
-			None::<Arc<UtxoLookup>>,
-			Arc::clone(&logger),
+			verifier,
+			logger,
 		));
 		Self::P2PNetwork { gossip_sync }
 	}
@@ -62,27 +72,6 @@ impl GossipSource {
 		}
 	}
 
-	pub(crate) fn set_gossip_verifier(
-		&self, chain_source: Arc<ChainSource>, peer_manager: Arc<PeerManager>,
-		runtime: Arc<Runtime>,
-	) {
-		match self {
-			Self::P2PNetwork { gossip_sync } => {
-				if let Some(utxo_source) = chain_source.as_utxo_source() {
-					let spawner = RuntimeSpawner::new(Arc::clone(&runtime));
-					let gossip_verifier = Arc::new(GossipVerifier::new(
-						Arc::new(utxo_source),
-						spawner,
-						Arc::clone(gossip_sync),
-						peer_manager,
-					));
-					gossip_sync.add_utxo_lookup(Some(gossip_verifier));
-				}
-			},
-			_ => (),
-		}
-	}
-
 	pub async fn update_rgs_snapshot(&self) -> Result<u32, Error> {
 		match self {
 			Self::P2PNetwork { gossip_sync: _, .. } => Ok(0),

src/types.rs

@@ -253,7 +253,7 @@ pub(crate) type Scorer = CombinedScorer<Arc<Graph>, Arc<Logger>>;
 
 pub(crate) type Graph = gossip::NetworkGraph<Arc<Logger>>;
 
-pub(crate) type UtxoLookup = GossipVerifier<RuntimeSpawner, Arc<UtxoSourceClient>, Arc<Logger>>;
+pub(crate) type UtxoLookup = GossipVerifier<RuntimeSpawner, Arc<UtxoSourceClient>>;
 
 pub(crate) type P2PGossipSync =
 	lightning::routing::gossip::P2PGossipSync<Arc<Graph>, Arc<UtxoLookup>, Arc<Logger>>;