Add missing fields to the light sync state (#7225)

* Initial draft

* Add an iterator that helps us get most items

* Revert changes to grandpa

* Change fields to just be the grandpa authority set and babe epoch changes

* Only use the fields we need from the shared authority set

* Switch to RPC call

* Revert "Only use the fields we need from the shared authority set"

This reverts commit 6ede87b0c5fe53f251d7cb45951006a7dc8f9b83.

* Add babe_finalized_block_weight from `ashley-improve-sync-state-WIP-loading`

* Fix rpc test

* Move sync state rpc stuff into sc-sync-state-rpc

* Remove as_json_value and remove unwraps from sc-sync-state-rpc

* Add clone_inner to SharedAuthoritySet

substrate/bin/node/rpc/src/lib.rs

@@ -49,6 +49,7 @@ use sp_consensus::SelectChain;
 use sp_consensus_babe::BabeApi;
 use sc_rpc::SubscriptionTaskExecutor;
 use sp_transaction_pool::TransactionPool;
+use sc_client_api::AuxStore;
 
 /// Light client extra dependencies.
 pub struct LightDeps<C, F, P> {
@@ -94,6 +95,8 @@ pub struct FullDeps<C, P, SC, B> {
 	pub pool: Arc<P>,
 	/// The SelectChain Strategy
 	pub select_chain: SC,
+	/// A copy of the chain spec.
+	pub chain_spec: Box<dyn sc_chain_spec::ChainSpec>,
 	/// Whether to deny unsafe calls
 	pub deny_unsafe: DenyUnsafe,
 	/// BABE specific dependencies.
@@ -109,9 +112,8 @@ pub type IoHandler = jsonrpc_core::IoHandler<sc_rpc::Metadata>;
 pub fn create_full<C, P, SC, B>(
 	deps: FullDeps<C, P, SC, B>,
 ) -> jsonrpc_core::IoHandler<sc_rpc_api::Metadata> where
-	C: ProvideRuntimeApi<Block>,
-	C: HeaderBackend<Block> + HeaderMetadata<Block, Error=BlockChainError> + 'static,
-	C: Send + Sync + 'static,
+	C: ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore +
+		HeaderMetadata<Block, Error=BlockChainError> + Sync + Send + 'static,
 	C::Api: substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Index>,
 	C::Api: pallet_contracts_rpc::ContractsRuntimeApi<Block, AccountId, Balance, BlockNumber>,
 	C::Api: pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance>,
@@ -131,6 +133,7 @@ pub fn create_full<C, P, SC, B>(
 		client,
 		pool,
 		select_chain,
+		chain_spec,
 		deny_unsafe,
 		babe,
 		grandpa,
@@ -164,8 +167,8 @@ pub fn create_full<C, P, SC, B>(
 	io.extend_with(
 		sc_consensus_babe_rpc::BabeApi::to_delegate(
 			BabeRpcHandler::new(
-				client,
-				shared_epoch_changes,
+				client.clone(),
+				shared_epoch_changes.clone(),
 				keystore,
 				babe_config,
 				select_chain,
@@ -176,7 +179,7 @@ pub fn create_full<C, P, SC, B>(
 	io.extend_with(
 		sc_finality_grandpa_rpc::GrandpaApi::to_delegate(
 			GrandpaRpcHandler::new(
-				shared_authority_set,
+				shared_authority_set.clone(),
 				shared_voter_state,
 				justification_stream,
 				subscription_executor,
@@ -185,6 +188,18 @@ pub fn create_full<C, P, SC, B>(
 		)
 	);
 
+	io.extend_with(
+		sc_sync_state_rpc::SyncStateRpcApi::to_delegate(
+			sc_sync_state_rpc::SyncStateRpcHandler::new(
+				chain_spec,
+				client,
+				shared_authority_set,
+				shared_epoch_changes,
+				deny_unsafe,
+			)
+		)
+	);
+
 	io
 }