Add timeout for Lightning syncing

.. even though we don't expect this to block, we're better safe than
sorry and start to introduce timeouts for any calls we make to remote
servers.

Author: tnull

src/config.rs

@@ -45,6 +45,9 @@ pub(crate) const WALLET_SYNC_INTERVAL_MINIMUM_SECS: u64 = 10;
 // The timeout after which we abort a wallet syncing operation.
 pub(crate) const BDK_WALLET_SYNC_TIMEOUT_SECS: u64 = 90;
 
+// The timeout after which we abort a wallet syncing operation.
+pub(crate) const LDK_WALLET_SYNC_TIMEOUT_SECS: u64 = 30;
+
 // The length in bytes of our wallets' keys seed.
 pub(crate) const WALLET_KEYS_SEED_LEN: usize = 64;
 

src/lib.rs

@@ -122,8 +122,8 @@ pub use builder::BuildError;
 pub use builder::NodeBuilder as Builder;
 
 use config::{
-	NODE_ANN_BCAST_INTERVAL, PEER_RECONNECTION_INTERVAL, RGS_SYNC_INTERVAL,
-	WALLET_SYNC_INTERVAL_MINIMUM_SECS,
+	LDK_WALLET_SYNC_TIMEOUT_SECS, NODE_ANN_BCAST_INTERVAL, PEER_RECONNECTION_INTERVAL,
+	RGS_SYNC_INTERVAL, WALLET_SYNC_INTERVAL_MINIMUM_SECS,
 };
 use connection::ConnectionManager;
 use event::{EventHandler, EventQueue};
@@ -366,19 +366,25 @@ impl Node {
 							&*sync_sweeper as &(dyn Confirm + Sync + Send),
 						];
 						let now = Instant::now();
-						match tx_sync.sync(confirmables).await {
-							Ok(()) => {
-								log_trace!(
-								sync_logger,
-								"Background sync of Lightning wallet finished in {}ms.",
-								now.elapsed().as_millis()
-								);
-								let unix_time_secs_opt =
-									SystemTime::now().duration_since(UNIX_EPOCH).ok().map(|d| d.as_secs());
-								*sync_wallet_timestamp.write().unwrap() = unix_time_secs_opt;
+						let timeout_fut = tokio::time::timeout(Duration::from_secs(LDK_WALLET_SYNC_TIMEOUT_SECS), tx_sync.sync(confirmables));
+						match timeout_fut.await {
+							Ok(res) => match res {
+								Ok(()) => {
+									log_trace!(
+										sync_logger,
+										"Background sync of Lightning wallet finished in {}ms.",
+										now.elapsed().as_millis()
+										);
+									let unix_time_secs_opt =
+										SystemTime::now().duration_since(UNIX_EPOCH).ok().map(|d| d.as_secs());
+									*sync_wallet_timestamp.write().unwrap() = unix_time_secs_opt;
+								}
+								Err(e) => {
+									log_error!(sync_logger, "Background sync of Lightning wallet failed: {}", e)
+								}
 							}
 							Err(e) => {
-								log_error!(sync_logger, "Background sync of Lightning wallet failed: {}", e)
+								log_error!(sync_logger, "Background sync of Lightning wallet timed out: {}", e)
 							}
 						}
 					}