Companion for Substrate#10568 - Add new BEEFY RPC (#4638)

* support best Beefy RPC through arc<mutex>

* beefy RPC through lockless message passing - wip

Not working because channel can't be simply opened and receiver passed
to `rpc_extensions_builder` because `rpc_extensions_builder` has to be
`Fn` and not `FnOnce`... and and Receiver side of mpsc can't be cloned

yay!..

* beefy RPC through lockless message passing

* beefy: use specialized type definitions

* bubble up service errors from BEEFY RPC

* update lockfile for substrate

Co-authored-by: parity-processbot <>

polkadot/node/service/src/lib.rs

@@ -34,6 +34,7 @@ mod tests;
 
 #[cfg(feature = "full-node")]
 use {
+	beefy_gadget::notification::{BeefyBestBlockSender, BeefySignedCommitmentSender},
 	grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider},
 	polkadot_node_core_approval_voting::Config as ApprovalVotingConfig,
 	polkadot_node_core_av_store::Config as AvailabilityConfig,
@@ -414,7 +415,7 @@ fn new_partial<RuntimeApi, ExecutorDispatch, ChainSelection>(
 				>,
 				grandpa::LinkHalf<Block, FullClient<RuntimeApi, ExecutorDispatch>, ChainSelection>,
 				babe::BabeLink<Block>,
-				beefy_gadget::notification::BeefySignedCommitmentSender<Block>,
+				(BeefySignedCommitmentSender<Block>, BeefyBestBlockSender<Block>),
 			),
 			grandpa::SharedVoterState,
 			std::time::Duration, // slot-duration
@@ -485,8 +486,11 @@ where
 		telemetry.as_ref().map(|x| x.handle()),
 	)?;
 
-	let (beefy_link, beefy_commitment_stream) =
-		beefy_gadget::notification::BeefySignedCommitmentStream::channel();
+	let (beefy_commitment_link, beefy_commitment_stream) =
+		beefy_gadget::notification::BeefySignedCommitmentStream::<Block>::channel();
+	let (beefy_best_block_link, beefy_best_block_stream) =
+		beefy_gadget::notification::BeefyBestBlockStream::<Block>::channel();
+	let beefy_links = (beefy_commitment_link, beefy_best_block_link);
 
 	let justification_stream = grandpa_link.justification_stream();
 	let shared_authority_set = grandpa_link.shared_authority_set().clone();
@@ -496,12 +500,12 @@ where
 		Some(shared_authority_set.clone()),
 	);
 
-	let import_setup = (block_import.clone(), grandpa_link, babe_link.clone(), beefy_link);
-	let rpc_setup = shared_voter_state.clone();
-
 	let shared_epoch_changes = babe_link.epoch_changes().clone();
 	let slot_duration = babe_config.slot_duration();
 
+	let import_setup = (block_import, grandpa_link, babe_link, beefy_links);
+	let rpc_setup = shared_voter_state.clone();
+
 	let rpc_extensions_builder = {
 		let client = client.clone();
 		let keystore = keystore_container.sync_keystore();
@@ -532,6 +536,7 @@ where
 				},
 				beefy: polkadot_rpc::BeefyDeps {
 					beefy_commitment_stream: beefy_commitment_stream.clone(),
+					beefy_best_block_stream: beefy_best_block_stream.clone(),
 					subscription_executor,
 				},
 			};
@@ -893,7 +898,7 @@ where
 		telemetry: telemetry.as_mut(),
 	})?;
 
-	let (block_import, link_half, babe_link, beefy_link) = import_setup;
+	let (block_import, link_half, babe_link, beefy_links) = import_setup;
 
 	let overseer_client = client.clone();
 	let spawner = task_manager.spawn_handle();
@@ -1091,7 +1096,8 @@ where
 			backend: backend.clone(),
 			key_store: keystore_opt.clone(),
 			network: network.clone(),
-			signed_commitment_sender: beefy_link,
+			signed_commitment_sender: beefy_links.0,
+			beefy_best_block_sender: beefy_links.1,
 			min_block_delta: if chain_spec.is_wococo() { 4 } else { 8 },
 			prometheus_registry: prometheus_registry.clone(),
 			protocol_name: beefy_protocol_name,

polkadot/rpc/src/lib.rs

@@ -61,10 +61,13 @@ pub struct GrandpaDeps<B> {
 	pub finality_provider: Arc<FinalityProofProvider<B, Block>>,
 }
 
+use beefy_gadget::notification::{BeefyBestBlockStream, BeefySignedCommitmentStream};
 /// Dependencies for BEEFY
 pub struct BeefyDeps {
 	/// Receives notifications about signed commitment events from BEEFY.
-	pub beefy_commitment_stream: beefy_gadget::notification::BeefySignedCommitmentStream<Block>,
+	pub beefy_commitment_stream: BeefySignedCommitmentStream<Block>,
+	/// Receives notifications about best block events from BEEFY.
+	pub beefy_best_block_stream: BeefyBestBlockStream<Block>,
 	/// Executor to drive the subscription manager in the BEEFY RPC handler.
 	pub subscription_executor: sc_rpc::SubscriptionTaskExecutor,
 }
@@ -155,12 +158,12 @@ where
 		deny_unsafe,
 	)?));
 
-	io.extend_with(beefy_gadget_rpc::BeefyApi::to_delegate(
-		beefy_gadget_rpc::BeefyRpcHandler::new(
+	let handler: beefy_gadget_rpc::BeefyRpcHandler<Block> = beefy_gadget_rpc::BeefyRpcHandler::new(
 		beefy.beefy_commitment_stream,
+		beefy.beefy_best_block_stream,
 		beefy.subscription_executor,
-		),
-	));
+	)?;
+	io.extend_with(beefy_gadget_rpc::BeefyApi::to_delegate(handler));
 
 	Ok(io)
 }