Companion PR for #6215 (#1654)

* Companion PR for #6215

* rpc: fix reviewer comments

* "Update Substrate"

Co-authored-by: parity-processbot <>
Co-authored-by: André Silva <andrerfosilva@gmail.com>

polkadot/node/service/src/lib.rs

@@ -134,7 +134,10 @@ fn new_partial<RuntimeApi, Executor>(config: &mut Configuration) -> Result<
 				grandpa::LinkHalf<Block, FullClient<RuntimeApi, Executor>, FullSelectChain>,
 				babe::BabeLink<Block>
 			),
-			grandpa::SharedVoterState,
+			(
+				grandpa::SharedVoterState,
+				Arc<GrandpaFinalityProofProvider<FullBackend, Block>>,
+			),
 		)
 	>,
 	Error
@@ -200,9 +203,11 @@ fn new_partial<RuntimeApi, Executor>(config: &mut Configuration) -> Result<
 	let justification_stream = grandpa_link.justification_stream();
 	let shared_authority_set = grandpa_link.shared_authority_set().clone();
 	let shared_voter_state = grandpa::SharedVoterState::empty();
+	let finality_proof_provider =
+		GrandpaFinalityProofProvider::new_for_service(backend.clone(), client.clone());
 
 	let import_setup = (block_import.clone(), grandpa_link, babe_link.clone());
-	let rpc_setup = shared_voter_state.clone();
+	let rpc_setup = (shared_voter_state.clone(), finality_proof_provider.clone());
 
 	let babe_config = babe_link.config().clone();
 	let shared_epoch_changes = babe_link.epoch_changes().clone();
@@ -229,6 +234,7 @@ fn new_partial<RuntimeApi, Executor>(config: &mut Configuration) -> Result<
 					shared_authority_set: shared_authority_set.clone(),
 					justification_stream: justification_stream.clone(),
 					subscription_executor,
+					finality_provider: finality_proof_provider.clone(),
 				},
 			};
 
@@ -316,8 +322,7 @@ fn new_full<RuntimeApi, Executor>(
 
 	let prometheus_registry = config.prometheus_registry().cloned();
 
-	let finality_proof_provider =
-		GrandpaFinalityProofProvider::new_for_service(backend.clone(), client.clone());
+	let (shared_voter_state, finality_proof_provider) = rpc_setup;
 
 	let (network, network_status_sinks, system_rpc_tx, network_starter) =
 		service::build_network(service::BuildNetworkParams {
@@ -357,8 +362,6 @@ fn new_full<RuntimeApi, Executor>(
 
 	let (block_import, link_half, babe_link) = import_setup;
 
-	let shared_voter_state = rpc_setup;
-
 	let overseer_client = client.clone();
 	let spawner = task_manager.spawn_handle();
 	let leaves: Vec<_> = select_chain.clone()

polkadot/rpc/src/lib.rs

@@ -23,12 +23,13 @@ use std::sync::Arc;
 use polkadot_primitives::v0::{Block, BlockNumber, AccountId, Nonce, Balance, Hash};
 use sp_api::ProvideRuntimeApi;
 use txpool_api::TransactionPool;
+use sp_block_builder::BlockBuilder;
 use sp_blockchain::{HeaderBackend, HeaderMetadata, Error as BlockChainError};
 use sp_consensus::SelectChain;
 use sp_consensus_babe::BabeApi;
 use sc_client_api::light::{Fetcher, RemoteBlockchain};
 use sc_consensus_babe::Epoch;
-use sp_block_builder::BlockBuilder;
+use sc_finality_grandpa::FinalityProofProvider;
 pub use sc_rpc::{DenyUnsafe, SubscriptionTaskExecutor};
 
 /// A type representing all RPC extensions.
@@ -57,19 +58,21 @@ pub struct BabeDeps {
 }
 
 /// Dependencies for GRANDPA
-pub struct GrandpaDeps {
+pub struct GrandpaDeps<B> {
 	/// Voting round info.
 	pub shared_voter_state: sc_finality_grandpa::SharedVoterState,
 	/// Authority set info.
 	pub shared_authority_set: sc_finality_grandpa::SharedAuthoritySet<Hash, BlockNumber>,
 	/// Receives notifications about justification events from Grandpa.
 	pub justification_stream: sc_finality_grandpa::GrandpaJustificationStream<Block>,
-	/// Subscription manager to keep track of pubsub subscribers.
+	/// Executor to drive the subscription manager in the Grandpa RPC handler.
 	pub subscription_executor: sc_rpc::SubscriptionTaskExecutor,
+	/// Finality proof provider.
+	pub finality_provider: Arc<FinalityProofProvider<B, Block>>,
 }
 
 /// Full client dependencies
-pub struct FullDeps<C, P, SC> {
+pub struct FullDeps<C, P, SC, B> {
 	/// The client instance to use.
 	pub client: Arc<C>,
 	/// Transaction pool instance.
@@ -81,11 +84,11 @@ pub struct FullDeps<C, P, SC> {
 	/// BABE specific dependencies.
 	pub babe: BabeDeps,
 	/// GRANDPA specific dependencies.
-	pub grandpa: GrandpaDeps,
+	pub grandpa: GrandpaDeps<B>,
 }
 
 /// Instantiate all RPC extensions.
-pub fn create_full<C, P, SC>(deps: FullDeps<C, P, SC>) -> RpcExtension where
+pub fn create_full<C, P, SC, B>(deps: FullDeps<C, P, SC, B>) -> RpcExtension where
 	C: ProvideRuntimeApi<Block>,
 	C: HeaderBackend<Block> + HeaderMetadata<Block, Error=BlockChainError>,
 	C: Send + Sync + 'static,
@@ -95,6 +98,8 @@ pub fn create_full<C, P, SC>(deps: FullDeps<C, P, SC>) -> RpcExtension where
 	C::Api: BlockBuilder<Block>,
 	P: TransactionPool + Sync + Send + 'static,
 	SC: SelectChain<Block> + 'static,
+	B: sc_client_api::Backend<Block> + Send + Sync + 'static,
+	B::State: sc_client_api::StateBackend<sp_runtime::traits::HashFor<Block>>,
 {
 	use frame_rpc_system::{FullSystem, SystemApi};
 	use pallet_transaction_payment_rpc::{TransactionPayment, TransactionPaymentApi};
@@ -120,6 +125,7 @@ pub fn create_full<C, P, SC>(deps: FullDeps<C, P, SC>) -> RpcExtension where
 		shared_authority_set,
 		justification_stream,
 		subscription_executor,
+		finality_provider,
 	} = grandpa;
 
 	io.extend_with(
@@ -146,6 +152,7 @@ pub fn create_full<C, P, SC>(deps: FullDeps<C, P, SC>) -> RpcExtension where
 			shared_voter_state,
 			justification_stream,
 			subscription_executor,
+			finality_provider,
 		))
 	);
 	io

polkadot/service/src/lib.rs

@@ -132,7 +132,10 @@ pub fn new_partial<RuntimeApi, Executor>(config: &mut Configuration, test: bool)
 				grandpa::LinkHalf<Block, FullClient<RuntimeApi, Executor>, FullSelectChain>,
 				babe::BabeLink<Block>
 			),
-			grandpa::SharedVoterState,
+			(
+				grandpa::SharedVoterState,
+				Arc<GrandpaFinalityProofProvider<FullBackend, Block>>,
+			),
 		)
 	>,
 	Error
@@ -203,9 +206,11 @@ pub fn new_partial<RuntimeApi, Executor>(config: &mut Configuration, test: bool)
 	let justification_stream = grandpa_link.justification_stream();
 	let shared_authority_set = grandpa_link.shared_authority_set().clone();
 	let shared_voter_state = grandpa::SharedVoterState::empty();
+	let finality_proof_provider =
+		GrandpaFinalityProofProvider::new_for_service(backend.clone(), client.clone());
 
 	let import_setup = (block_import.clone(), grandpa_link, babe_link.clone());
-	let rpc_setup = shared_voter_state.clone();
+	let rpc_setup = (shared_voter_state.clone(), finality_proof_provider.clone());
 
 	let babe_config = babe_link.config().clone();
 	let shared_epoch_changes = babe_link.epoch_changes().clone();
@@ -232,6 +237,7 @@ pub fn new_partial<RuntimeApi, Executor>(config: &mut Configuration, test: bool)
 					shared_authority_set: shared_authority_set.clone(),
 					justification_stream: justification_stream.clone(),
 					subscription_executor,
+					finality_provider: finality_proof_provider.clone(),
 				},
 			};
 
@@ -303,8 +309,7 @@ pub fn new_full<RuntimeApi, Executor>(
 
 	let prometheus_registry = config.prometheus_registry().cloned();
 
-	let finality_proof_provider =
-		GrandpaFinalityProofProvider::new_for_service(backend.clone(), client.clone());
+	let (shared_voter_state, finality_proof_provider) = rpc_setup;
 
 	let (network, network_status_sinks, system_rpc_tx, network_starter) =
 		service::build_network(service::BuildNetworkParams {
@@ -345,8 +350,6 @@ pub fn new_full<RuntimeApi, Executor>(
 
 	let (block_import, link_half, babe_link) = import_setup;
 
-	let shared_voter_state = rpc_setup;
-
 	if role.is_authority() {
 		let proposer = consensus::ProposerFactory::new(
 			client.clone(),