Runtime diagnostics for leaked messages in unbounded channels (#12971)

substrate/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)
 			},

substrate/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,

substrate/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);
 

substrate/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)]

substrate/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();
 

substrate/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,

substrate/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();