Runtime diagnostics for leaked messages in unbounded channels

client/api/src/notifications.rs

@@ -144,7 +144,9 @@ impl<Block: BlockT> StorageNotifications<Block> {
 		filter_keys: Option<&[StorageKey]>,
 		filter_child_keys: Option<&[(StorageKey, Option<Vec<StorageKey>>)]>,
 	) -> StorageEventStream<Block::Hash> {
-		let receiver = self.0.subscribe(registry::SubscribeOp { filter_keys, filter_child_keys });
+		let receiver = self
+			.0
+			.subscribe(registry::SubscribeOp { filter_keys, filter_child_keys }, 100_000);
 
 		StorageEventStream(receiver)
 	}

client/beefy/rpc/src/lib.rs

@@ -120,7 +120,7 @@ where
 	) -> Result<Self, Error> {
 		let beefy_best_block = Arc::new(RwLock::new(None));
 
-		let stream = best_block_stream.subscribe();
+		let stream = best_block_stream.subscribe(100_000);
 		let closure_clone = beefy_best_block.clone();
 		let future = stream.for_each(move |best_beefy| {
 			let async_clone = closure_clone.clone();
@@ -141,7 +141,7 @@ where
 	fn subscribe_justifications(&self, mut sink: SubscriptionSink) -> SubscriptionResult {
 		let stream = self
 			.finality_proof_stream
-			.subscribe()
+			.subscribe(100_000)
 			.map(|vfp| notification::EncodedVersionedFinalityProof::new::<Block>(vfp));
 
 		let fut = async move {

client/beefy/src/lib.rs

@@ -265,7 +265,7 @@ where
 	// Subscribe to finality notifications and justifications before waiting for runtime pallet and
 	// reuse the streams, so we don't miss notifications while waiting for pallet to be available.
 	let mut finality_notifications = client.finality_notification_stream().fuse();
-	let block_import_justif = links.from_block_import_justif_stream.subscribe().fuse();
+	let block_import_justif = links.from_block_import_justif_stream.subscribe(100_000).fuse();
 
 	// Wait for BEEFY pallet to be active before starting voter.
 	let persisted_state =

client/beefy/src/tests.rs

@@ -430,8 +430,8 @@ pub(crate) fn get_beefy_streams(
 		let beefy_rpc_links = net.peer(index).data.beefy_rpc_links.lock().clone().unwrap();
 		let BeefyRPCLinks { from_voter_justif_stream, from_voter_best_beefy_stream } =
 			beefy_rpc_links;
-		best_block_streams.push(from_voter_best_beefy_stream.subscribe());
-		versioned_finality_proof_streams.push(from_voter_justif_stream.subscribe());
+		best_block_streams.push(from_voter_best_beefy_stream.subscribe(100_000));
+		versioned_finality_proof_streams.push(from_voter_justif_stream.subscribe(100_000));
 	});
 	(best_block_streams, versioned_finality_proof_streams)
 }
@@ -736,7 +736,7 @@ async fn beefy_importing_blocks() {
 	let hashof1 = block.header.hash();
 
 	// Import without justifications.
-	let mut justif_recv = justif_stream.subscribe();
+	let mut justif_recv = justif_stream.subscribe(100_000);
 	assert_eq!(
 		block_import
 			.import_block(params(block.clone(), None), HashMap::new())
@@ -779,7 +779,7 @@ async fn beefy_importing_blocks() {
 	let builder = full_client.new_block_at(&parent_id, Default::default(), false).unwrap();
 	let block = builder.build().unwrap().block;
 	let hashof2 = block.header.hash();
-	let mut justif_recv = justif_stream.subscribe();
+	let mut justif_recv = justif_stream.subscribe(100_000);
 	assert_eq!(
 		block_import.import_block(params(block, justif), HashMap::new()).await.unwrap(),
 		ImportResult::Imported(ImportedAux {
@@ -823,7 +823,7 @@ async fn beefy_importing_blocks() {
 	let builder = full_client.new_block_at(&parent_id, Default::default(), false).unwrap();
 	let block = builder.build().unwrap().block;
 	let hashof3 = block.header.hash();
-	let mut justif_recv = justif_stream.subscribe();
+	let mut justif_recv = justif_stream.subscribe(100_000);
 	assert_eq!(
 		block_import.import_block(params(block, justif), HashMap::new()).await.unwrap(),
 		ImportResult::Imported(ImportedAux {

client/consensus/common/src/import_queue/basic_queue.rs

@@ -69,7 +69,7 @@ impl<B: BlockT, Transaction: Send + 'static> BasicQueue<B, Transaction> {
 		spawner: &impl sp_core::traits::SpawnEssentialNamed,
 		prometheus_registry: Option<&Registry>,
 	) -> Self {
-		let (result_sender, result_port) = buffered_link::buffered_link();
+		let (result_sender, result_port) = buffered_link::buffered_link(100_000);
 
 		let metrics = prometheus_registry.and_then(|r| {
 			Metrics::register(r)
@@ -276,10 +276,10 @@ impl<B: BlockT> BlockImportWorker<B> {
 		use worker_messages::*;
 
 		let (justification_sender, mut justification_port) =
-			tracing_unbounded("mpsc_import_queue_worker_justification");
+			tracing_unbounded("mpsc_import_queue_worker_justification", 100_000);
 
 		let (block_import_sender, block_import_port) =
-			tracing_unbounded("mpsc_import_queue_worker_blocks");
+			tracing_unbounded("mpsc_import_queue_worker_blocks", 100_000);
 
 		let mut worker = BlockImportWorker { result_sender, justification_import, metrics };
 
@@ -595,7 +595,7 @@ mod tests {
 
 	#[test]
 	fn prioritizes_finality_work_over_block_import() {
-		let (result_sender, mut result_port) = buffered_link::buffered_link();
+		let (result_sender, mut result_port) = buffered_link::buffered_link(100_000);
 
 		let (worker, mut finality_sender, mut block_import_sender) =
 			BlockImportWorker::new(result_sender, (), Box::new(()), Some(Box::new(())), None);

client/consensus/common/src/import_queue/buffered_link.rs

@@ -28,7 +28,7 @@
 //! # use sp_test_primitives::Block;
 //! # struct DummyLink; impl Link<Block> for DummyLink {}
 //! # let mut my_link = DummyLink;
-//! let (mut tx, mut rx) = buffered_link::<Block>();
+//! let (mut tx, mut rx) = buffered_link::<Block>(100_000);
 //! tx.blocks_processed(0, 0, vec![]);
 //!
 //! // Calls `my_link.blocks_processed(0, 0, vec![])` when polled.
@@ -51,9 +51,11 @@ use super::BlockImportResult;
 
 /// Wraps around an unbounded channel from the `futures` crate. The sender implements `Link` and
 /// can be used to buffer commands, and the receiver can be used to poll said commands and transfer
-/// them to another link.
-pub fn buffered_link<B: BlockT>() -> (BufferedLinkSender<B>, BufferedLinkReceiver<B>) {
-	let (tx, rx) = tracing_unbounded("mpsc_buffered_link");
+/// them to another link. `queue_size_warning` sets the warning threshold of the channel queue size.
+pub fn buffered_link<B: BlockT>(
+	queue_size_warning: i64,
+) -> (BufferedLinkSender<B>, BufferedLinkReceiver<B>) {
+	let (tx, rx) = tracing_unbounded("mpsc_buffered_link", queue_size_warning);
 	let tx = BufferedLinkSender { tx };
 	let rx = BufferedLinkReceiver { rx: rx.fuse() };
 	(tx, rx)
@@ -175,7 +177,7 @@ mod tests {
 
 	#[test]
 	fn is_closed() {
-		let (tx, rx) = super::buffered_link::<Block>();
+		let (tx, rx) = super::buffered_link::<Block>(1);
 		assert!(!tx.is_closed());
 		drop(rx);
 		assert!(tx.is_closed());

client/finality-grandpa/rpc/src/lib.rs

@@ -104,7 +104,7 @@ where
 	}
 
 	fn subscribe_justifications(&self, mut sink: SubscriptionSink) -> SubscriptionResult {
-		let stream = self.justification_stream.subscribe().map(
+		let stream = self.justification_stream.subscribe(100_000).map(
 			|x: sc_finality_grandpa::GrandpaJustification<Block>| {
 				JustificationNotification::from(x)
 			},

client/finality-grandpa/src/communication/gossip.rs

@@ -1364,7 +1364,7 @@ impl<Block: BlockT> GossipValidator<Block> {
 			None => None,
 		};
 
-		let (tx, rx) = tracing_unbounded("mpsc_grandpa_gossip_validator");
+		let (tx, rx) = tracing_unbounded("mpsc_grandpa_gossip_validator", 100_000);
 		let val = GossipValidator {
 			inner: parking_lot::RwLock::new(Inner::new(config)),
 			set_state,

client/finality-grandpa/src/communication/periodic.rs

@@ -70,6 +70,7 @@ impl<B: BlockT> NeighborPacketWorker<B> {
 	pub(super) fn new(rebroadcast_period: Duration) -> (Self, NeighborPacketSender<B>) {
 		let (tx, rx) = tracing_unbounded::<(Vec<PeerId>, NeighborPacket<NumberFor<B>>)>(
 			"mpsc_grandpa_neighbor_packet_worker",
+			100_000,
 		);
 		let delay = Delay::new(rebroadcast_period);
 

client/finality-grandpa/src/communication/tests.rs

@@ -135,7 +135,7 @@ impl NetworkEventStream for TestNetwork {
 		&self,
 		_name: &'static str,
 	) -> Pin<Box<dyn Stream<Item = NetworkEvent> + Send>> {
-		let (tx, rx) = tracing_unbounded("test");
+		let (tx, rx) = tracing_unbounded("test", 100_000);
 		let _ = self.sender.unbounded_send(Event::EventStream(tx));
 		Box::pin(rx)
 	}
@@ -253,7 +253,7 @@ fn voter_set_state() -> SharedVoterSetState<Block> {
 
 // needs to run in a tokio runtime.
 pub(crate) fn make_test_network() -> (impl Future<Output = Tester>, TestNetwork) {
-	let (tx, rx) = tracing_unbounded("test");
+	let (tx, rx) = tracing_unbounded("test", 100_000);
 	let net = TestNetwork { sender: tx };
 
 	#[derive(Clone)]

client/finality-grandpa/src/lib.rs

@@ -566,7 +566,8 @@ where
 			}
 		})?;
 
-	let (voter_commands_tx, voter_commands_rx) = tracing_unbounded("mpsc_grandpa_voter_command");
+	let (voter_commands_tx, voter_commands_rx) =
+		tracing_unbounded("mpsc_grandpa_voter_command", 100_000);
 
 	let (justification_sender, justification_stream) = GrandpaJustificationStream::channel();
 

client/finality-grandpa/src/observer.rs

@@ -437,7 +437,7 @@ mod tests {
 			aux_schema::load_persistent(&*backend, client.info().genesis_hash, 0, || Ok(voters))
 				.unwrap();
 
-		let (_tx, voter_command_rx) = tracing_unbounded("");
+		let (_tx, voter_command_rx) = tracing_unbounded("test_mpsc_voter_command", 100_000);
 
 		let observer = ObserverWork::new(
 			client,

client/finality-grandpa/src/until_imported.rs

@@ -579,7 +579,7 @@ mod tests {
 
 	impl TestChainState {
 		fn new() -> (Self, ImportNotifications<Block>) {
-			let (tx, rx) = tracing_unbounded("test");
+			let (tx, rx) = tracing_unbounded("test", 100_000);
 			let state =
 				TestChainState { sender: tx, known_blocks: Arc::new(Mutex::new(HashMap::new())) };
 
@@ -680,7 +680,7 @@ mod tests {
 		// enact all dependencies before importing the message
 		enact_dependencies(&chain_state);
 
-		let (global_tx, global_rx) = tracing_unbounded("test");
+		let (global_tx, global_rx) = tracing_unbounded("test", 100_000);
 
 		let until_imported = UntilGlobalMessageBlocksImported::new(
 			import_notifications,
@@ -708,7 +708,7 @@ mod tests {
 		let (chain_state, import_notifications) = TestChainState::new();
 		let block_status = chain_state.block_status();
 
-		let (global_tx, global_rx) = tracing_unbounded("test");
+		let (global_tx, global_rx) = tracing_unbounded("test", 100_000);
 
 		let until_imported = UntilGlobalMessageBlocksImported::new(
 			import_notifications,
@@ -896,7 +896,7 @@ mod tests {
 		let (chain_state, import_notifications) = TestChainState::new();
 		let block_status = chain_state.block_status();
 
-		let (global_tx, global_rx) = tracing_unbounded("test");
+		let (global_tx, global_rx) = tracing_unbounded("test", 100_000);
 
 		let block_sync_requester = TestBlockSyncRequester::default();
 

client/network/src/service.rs

@@ -208,7 +208,7 @@ where
 			&params.network_config.transport,
 		)?;
 
-		let (to_worker, from_service) = tracing_unbounded("mpsc_network_worker");
+		let (to_worker, from_service) = tracing_unbounded("mpsc_network_worker", 100_000);
 
 		if let Some(path) = &params.network_config.net_config_path {
 			fs::create_dir_all(path)?;
@@ -1003,7 +1003,7 @@ where
 	H: ExHashT,
 {
 	fn event_stream(&self, name: &'static str) -> Pin<Box<dyn Stream<Item = Event> + Send>> {
-		let (tx, rx) = out_events::channel(name);
+		let (tx, rx) = out_events::channel(name, 100_000);
 		let _ = self.to_worker.unbounded_send(ServiceToWorkerMsg::EventStream(tx));
 		Box::pin(rx)
 	}