Collator overseer builder unification (#3335)

resolve https://github.com/paritytech/polkadot-sdk/issues/3116

a follow-up on
https://github.com/paritytech/polkadot-sdk/pull/3061#pullrequestreview-1847530265:

- [x] reuse collator overseer builder for polkadot-node and collator
- [x] run zombienet test (0001-parachains-smoke-test.toml)
- [x] make wasm build errors more user-friendly for an easier problem
detection when using different toolchains in Rust

---------

Co-authored-by: ordian <write@reusable.software>
Co-authored-by: s0me0ne-unkn0wn <48632512+s0me0ne-unkn0wn@users.noreply.github.com>

polkadot/node/malus/src/variants/back_garbage_candidate.rs

@@ -20,14 +20,13 @@
 
 use polkadot_cli::{
 	service::{
-		AuthorityDiscoveryApi, AuxStore, BabeApi, Block, Error, ExtendedOverseerGenArgs,
-		HeaderBackend, Overseer, OverseerConnector, OverseerGen, OverseerGenArgs, OverseerHandle,
-		ParachainHost, ProvideRuntimeApi,
+		AuxStore, Error, ExtendedOverseerGenArgs, Overseer, OverseerConnector, OverseerGen,
+		OverseerGenArgs, OverseerHandle,
 	},
 	validator_overseer_builder, Cli,
 };
 use polkadot_node_subsystem::SpawnGlue;
-use polkadot_node_subsystem_types::DefaultSubsystemClient;
+use polkadot_node_subsystem_types::{ChainApiBackend, RuntimeApiSubsystemClient};
 use sp_core::traits::SpawnNamed;
 
 use crate::{
@@ -63,13 +62,9 @@ impl OverseerGen for BackGarbageCandidates {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<'_, Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		let spawner = args.spawner.clone();

polkadot/node/malus/src/variants/common.rs

@@ -23,10 +23,6 @@ use crate::{
 
 use polkadot_node_core_candidate_validation::find_validation_data;
 use polkadot_node_primitives::{InvalidCandidate, ValidationResult};
-use polkadot_node_subsystem::{
-	messages::{CandidateValidationMessage, ValidationFailed},
-	overseer,
-};
 
 use polkadot_primitives::{
 	CandidateCommitments, CandidateDescriptor, CandidateReceipt, PersistedValidationData,

polkadot/node/malus/src/variants/dispute_finalized_candidates.rs

@@ -34,14 +34,13 @@
 use futures::channel::oneshot;
 use polkadot_cli::{
 	service::{
-		AuthorityDiscoveryApi, AuxStore, BabeApi, Block, Error, ExtendedOverseerGenArgs,
-		HeaderBackend, Overseer, OverseerConnector, OverseerGen, OverseerGenArgs, OverseerHandle,
-		ParachainHost, ProvideRuntimeApi,
+		AuxStore, Error, ExtendedOverseerGenArgs, Overseer, OverseerConnector, OverseerGen,
+		OverseerGenArgs, OverseerHandle,
 	},
 	validator_overseer_builder, Cli,
 };
-use polkadot_node_subsystem::{messages::ApprovalVotingMessage, SpawnGlue};
-use polkadot_node_subsystem_types::{DefaultSubsystemClient, OverseerSignal};
+use polkadot_node_subsystem::SpawnGlue;
+use polkadot_node_subsystem_types::{ChainApiBackend, OverseerSignal, RuntimeApiSubsystemClient};
 use polkadot_node_subsystem_util::request_candidate_events;
 use polkadot_primitives::CandidateEvent;
 use sp_core::traits::SpawnNamed;
@@ -237,13 +236,9 @@ impl OverseerGen for DisputeFinalizedCandidates {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<'_, Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		gum::info!(

polkadot/node/malus/src/variants/dispute_valid_candidates.rs

@@ -24,14 +24,13 @@
 
 use polkadot_cli::{
 	service::{
-		AuthorityDiscoveryApi, AuxStore, BabeApi, Block, Error, ExtendedOverseerGenArgs,
-		HeaderBackend, Overseer, OverseerConnector, OverseerGen, OverseerGenArgs, OverseerHandle,
-		ParachainHost, ProvideRuntimeApi,
+		AuxStore, Error, ExtendedOverseerGenArgs, Overseer, OverseerConnector, OverseerGen,
+		OverseerGenArgs, OverseerHandle,
 	},
 	validator_overseer_builder, Cli,
 };
 use polkadot_node_subsystem::SpawnGlue;
-use polkadot_node_subsystem_types::DefaultSubsystemClient;
+use polkadot_node_subsystem_types::{ChainApiBackend, RuntimeApiSubsystemClient};
 use sp_core::traits::SpawnNamed;
 
 // Filter wrapping related types.
@@ -80,13 +79,9 @@ impl OverseerGen for DisputeValidCandidates {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<'_, Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		let spawner = args.spawner.clone();

polkadot/node/malus/src/variants/suggest_garbage_candidate.rs

@@ -25,14 +25,13 @@
 use futures::channel::oneshot;
 use polkadot_cli::{
 	service::{
-		AuthorityDiscoveryApi, AuxStore, BabeApi, Block, Error, ExtendedOverseerGenArgs,
-		HeaderBackend, Overseer, OverseerConnector, OverseerGen, OverseerGenArgs, OverseerHandle,
-		ParachainHost, ProvideRuntimeApi,
+		AuxStore, Error, ExtendedOverseerGenArgs, Overseer, OverseerConnector, OverseerGen,
+		OverseerGenArgs, OverseerHandle,
 	},
 	validator_overseer_builder, Cli,
 };
 use polkadot_node_primitives::{AvailableData, BlockData, PoV};
-use polkadot_node_subsystem_types::DefaultSubsystemClient;
+use polkadot_node_subsystem_types::{ChainApiBackend, RuntimeApiSubsystemClient};
 use polkadot_primitives::{CandidateDescriptor, CandidateReceipt};
 
 use polkadot_node_subsystem_util::request_validators;
@@ -52,7 +51,7 @@ use crate::{
 
 // Import extra types relevant to the particular
 // subsystem.
-use polkadot_node_subsystem::{messages::CandidateBackingMessage, SpawnGlue};
+use polkadot_node_subsystem::SpawnGlue;
 
 use std::sync::Arc;
 
@@ -296,13 +295,9 @@ impl OverseerGen for SuggestGarbageCandidates {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<'_, Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		gum::info!(

polkadot/node/malus/src/variants/support_disabled.rs

@@ -19,14 +19,13 @@
 
 use polkadot_cli::{
 	service::{
-		AuthorityDiscoveryApi, AuxStore, BabeApi, Block, Error, ExtendedOverseerGenArgs,
-		HeaderBackend, Overseer, OverseerConnector, OverseerGen, OverseerGenArgs, OverseerHandle,
-		ParachainHost, ProvideRuntimeApi,
+		AuxStore, Error, ExtendedOverseerGenArgs, Overseer, OverseerConnector, OverseerGen,
+		OverseerGenArgs, OverseerHandle,
 	},
 	validator_overseer_builder, Cli,
 };
 use polkadot_node_subsystem::SpawnGlue;
-use polkadot_node_subsystem_types::DefaultSubsystemClient;
+use polkadot_node_subsystem_types::{ChainApiBackend, RuntimeApiSubsystemClient};
 use sp_core::traits::SpawnNamed;
 
 use crate::interceptor::*;
@@ -50,13 +49,9 @@ impl OverseerGen for SupportDisabled {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<'_, Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		validator_overseer_builder(

polkadot/node/service/src/lib.rs

@@ -92,6 +92,7 @@ pub use chain_spec::{GenericChainSpec, RococoChainSpec, WestendChainSpec};
 pub use consensus_common::{Proposal, SelectChain};
 use frame_benchmarking_cli::SUBSTRATE_REFERENCE_HARDWARE;
 use mmr_gadget::MmrGadget;
+use polkadot_node_subsystem_types::DefaultSubsystemClient;
 pub use polkadot_primitives::{Block, BlockId, BlockNumber, CollatorPair, Hash, Id as ParaId};
 pub use sc_client_api::{Backend, CallExecutor};
 pub use sc_consensus::{BlockImport, LongestChain};
@@ -1081,12 +1082,17 @@ pub fn new_full<OverseerGenerator: OverseerGen>(
 			None
 		};
 
+	let runtime_client = Arc::new(DefaultSubsystemClient::new(
+		overseer_client.clone(),
+		OffchainTransactionPoolFactory::new(transaction_pool.clone()),
+	));
+
 	let overseer_handle = if let Some(authority_discovery_service) = authority_discovery_service {
 		let (overseer, overseer_handle) = overseer_gen
-			.generate::<service::SpawnTaskHandle, FullClient>(
+			.generate::<service::SpawnTaskHandle, DefaultSubsystemClient<FullClient>>(
 				overseer_connector,
 				OverseerGenArgs {
-					runtime_client: overseer_client.clone(),
+					runtime_client,
 					network_service: network.clone(),
 					sync_service: sync_service.clone(),
 					authority_discovery_service,
@@ -1099,9 +1105,6 @@ pub fn new_full<OverseerGenerator: OverseerGen>(
 					overseer_message_channel_capacity_override,
 					req_protocol_names,
 					peerset_protocol_names,
-					offchain_transaction_pool_factory: OffchainTransactionPoolFactory::new(
-						transaction_pool.clone(),
-					),
 					notification_services,
 				},
 				ext_overseer_args,

polkadot/node/service/src/overseer.rs

@@ -14,10 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
-use super::{AuthorityDiscoveryApi, Block, Error, Hash, IsParachainNode, Registry};
-use polkadot_node_subsystem_types::DefaultSubsystemClient;
+use super::{Block, Error, Hash, IsParachainNode, Registry};
+use polkadot_node_subsystem_types::{ChainApiBackend, RuntimeApiSubsystemClient};
 use polkadot_overseer::{DummySubsystem, InitializedOverseerBuilder, SubsystemError};
-use sc_transaction_pool_api::OffchainTransactionPoolFactory;
 use sp_core::traits::SpawnNamed;
 
 use polkadot_availability_distribution::IncomingRequestReceivers;
@@ -40,14 +39,10 @@ use polkadot_overseer::{
 };
 
 use parking_lot::Mutex;
-use polkadot_primitives::runtime_api::ParachainHost;
 use sc_authority_discovery::Service as AuthorityDiscoveryService;
 use sc_client_api::AuxStore;
 use sc_keystore::LocalKeystore;
 use sc_network::{NetworkStateInfo, NotificationService};
-use sp_api::ProvideRuntimeApi;
-use sp_blockchain::HeaderBackend;
-use sp_consensus_babe::BabeApi;
 use std::{collections::HashMap, sync::Arc};
 
 pub use polkadot_approval_distribution::ApprovalDistribution as ApprovalDistributionSubsystem;
@@ -80,8 +75,6 @@ pub use polkadot_statement_distribution::StatementDistributionSubsystem;
 /// Arguments passed for overseer construction.
 pub struct OverseerGenArgs<'a, Spawner, RuntimeClient>
 where
-	RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-	RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
 	Spawner: 'static + SpawnNamed + Clone + Unpin,
 {
 	/// Runtime client generic, providing the `ProvieRuntimeApi` trait besides others.
@@ -89,7 +82,7 @@ where
 	/// Underlying network service implementation.
 	pub network_service: Arc<sc_network::NetworkService<Block, Hash>>,
 	/// Underlying syncing service implementation.
-	pub sync_service: Arc<sc_network_sync::SyncingService<Block>>,
+	pub sync_service: Arc<dyn consensus_common::SyncOracle + Send + Sync>,
 	/// Underlying authority discovery service.
 	pub authority_discovery_service: AuthorityDiscoveryService,
 	/// Collations request receiver for network protocol v1.
@@ -111,8 +104,6 @@ where
 	pub req_protocol_names: ReqProtocolNames,
 	/// `PeerSet` protocol names to protocols mapping.
 	pub peerset_protocol_names: PeerSetProtocolNames,
-	/// The offchain transaction pool factory.
-	pub offchain_transaction_pool_factory: OffchainTransactionPoolFactory<Block>,
 	/// Notification services for validation/collation protocols.
 	pub notification_services: HashMap<PeerSet, Box<dyn NotificationService>>,
 }
@@ -160,7 +151,6 @@ pub fn validator_overseer_builder<Spawner, RuntimeClient>(
 		overseer_message_channel_capacity_override,
 		req_protocol_names,
 		peerset_protocol_names,
-		offchain_transaction_pool_factory,
 		notification_services,
 	}: OverseerGenArgs<Spawner, RuntimeClient>,
 	ExtendedOverseerGenArgs {
@@ -180,7 +170,7 @@ pub fn validator_overseer_builder<Spawner, RuntimeClient>(
 ) -> Result<
 	InitializedOverseerBuilder<
 		SpawnGlue<Spawner>,
-		Arc<DefaultSubsystemClient<RuntimeClient>>,
+		Arc<RuntimeClient>,
 		CandidateValidationSubsystem,
 		PvfCheckerSubsystem,
 		CandidateBackingSubsystem,
@@ -190,7 +180,7 @@ pub fn validator_overseer_builder<Spawner, RuntimeClient>(
 		BitfieldSigningSubsystem,
 		BitfieldDistributionSubsystem,
 		ProvisionerSubsystem,
-		RuntimeApiSubsystem<DefaultSubsystemClient<RuntimeClient>>,
+		RuntimeApiSubsystem<RuntimeClient>,
 		AvailabilityStoreSubsystem,
 		NetworkBridgeRxSubsystem<
 			Arc<sc_network::NetworkService<Block, Hash>>,
@@ -214,8 +204,7 @@ pub fn validator_overseer_builder<Spawner, RuntimeClient>(
 	Error,
 >
 where
-	RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-	RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+	RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 	Spawner: 'static + SpawnNamed + Clone + Unpin,
 {
 	use polkadot_node_subsystem_util::metrics::Metrics;
@@ -227,11 +216,6 @@ where
 
 	let network_bridge_metrics: NetworkBridgeMetrics = Metrics::register(registry)?;
 
-	let runtime_api_client = Arc::new(DefaultSubsystemClient::new(
-		runtime_client.clone(),
-		offchain_transaction_pool_factory,
-	));
-
 	let builder = Overseer::builder()
 		.network_bridge_tx(NetworkBridgeTxSubsystem::new(
 			network_service.clone(),
@@ -298,7 +282,7 @@ where
 		})
 		.provisioner(ProvisionerSubsystem::new(Metrics::register(registry)?))
 		.runtime_api(RuntimeApiSubsystem::new(
-			runtime_api_client.clone(),
+			runtime_client.clone(),
 			Metrics::register(registry)?,
 			spawner.clone(),
 		))
@@ -339,7 +323,7 @@ where
 		.activation_external_listeners(Default::default())
 		.span_per_active_leaf(Default::default())
 		.active_leaves(Default::default())
-		.supports_parachains(runtime_api_client)
+		.supports_parachains(runtime_client)
 		.metrics(metrics)
 		.spawner(spawner);
 
@@ -367,13 +351,12 @@ pub fn collator_overseer_builder<Spawner, RuntimeClient>(
 		overseer_message_channel_capacity_override,
 		req_protocol_names,
 		peerset_protocol_names,
-		offchain_transaction_pool_factory,
 		notification_services,
 	}: OverseerGenArgs<Spawner, RuntimeClient>,
 ) -> Result<
 	InitializedOverseerBuilder<
 		SpawnGlue<Spawner>,
-		Arc<DefaultSubsystemClient<RuntimeClient>>,
+		Arc<RuntimeClient>,
 		DummySubsystem,
 		DummySubsystem,
 		DummySubsystem,
@@ -383,7 +366,7 @@ pub fn collator_overseer_builder<Spawner, RuntimeClient>(
 		DummySubsystem,
 		DummySubsystem,
 		DummySubsystem,
-		RuntimeApiSubsystem<DefaultSubsystemClient<RuntimeClient>>,
+		RuntimeApiSubsystem<RuntimeClient>,
 		DummySubsystem,
 		NetworkBridgeRxSubsystem<
 			Arc<sc_network::NetworkService<Block, Hash>>,
@@ -407,24 +390,17 @@ pub fn collator_overseer_builder<Spawner, RuntimeClient>(
 	Error,
 >
 where
-	RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-	RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
 	Spawner: 'static + SpawnNamed + Clone + Unpin,
+	RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 {
 	use polkadot_node_subsystem_util::metrics::Metrics;
 
-	let metrics = <OverseerMetrics as MetricsTrait>::register(registry)?;
 	let notification_sinks = Arc::new(Mutex::new(HashMap::new()));
 
 	let spawner = SpawnGlue(spawner);
 
 	let network_bridge_metrics: NetworkBridgeMetrics = Metrics::register(registry)?;
 
-	let runtime_api_client = Arc::new(DefaultSubsystemClient::new(
-		runtime_client.clone(),
-		offchain_transaction_pool_factory,
-	));
-
 	let builder = Overseer::builder()
 		.network_bridge_tx(NetworkBridgeTxSubsystem::new(
 			network_service.clone(),
@@ -475,7 +451,7 @@ where
 		})
 		.provisioner(DummySubsystem)
 		.runtime_api(RuntimeApiSubsystem::new(
-			runtime_api_client.clone(),
+			runtime_client.clone(),
 			Metrics::register(registry)?,
 			spawner.clone(),
 		))
@@ -490,8 +466,8 @@ where
 		.activation_external_listeners(Default::default())
 		.span_per_active_leaf(Default::default())
 		.active_leaves(Default::default())
-		.supports_parachains(runtime_api_client)
-		.metrics(metrics)
+		.supports_parachains(runtime_client)
+		.metrics(Metrics::register(registry)?)
 		.spawner(spawner);
 
 	let builder = if let Some(capacity) = overseer_message_channel_capacity_override {
@@ -510,13 +486,9 @@ pub trait OverseerGen {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin;
 
 	// It would be nice to make `create_subsystems` part of this trait,
@@ -533,13 +505,9 @@ impl OverseerGen for ValidatorOverseerGen {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<Spawner, RuntimeClient>,
 		ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		let ext_args = ext_args.ok_or(Error::Overseer(SubsystemError::Context(
@@ -561,13 +529,9 @@ impl OverseerGen for CollatorOverseerGen {
 		connector: OverseerConnector,
 		args: OverseerGenArgs<Spawner, RuntimeClient>,
 		_ext_args: Option<ExtendedOverseerGenArgs>,
-	) -> Result<
-		(Overseer<SpawnGlue<Spawner>, Arc<DefaultSubsystemClient<RuntimeClient>>>, OverseerHandle),
-		Error,
-	>
+	) -> Result<(Overseer<SpawnGlue<Spawner>, Arc<RuntimeClient>>, OverseerHandle), Error>
 	where
-		RuntimeClient: 'static + ProvideRuntimeApi<Block> + HeaderBackend<Block> + AuxStore,
-		RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
+		RuntimeClient: RuntimeApiSubsystemClient + ChainApiBackend + AuxStore + 'static,
 		Spawner: 'static + SpawnNamed + Clone + Unpin,
 	{
 		collator_overseer_builder(args)?

polkadot/node/subsystem-types/src/runtime_client.rs

@@ -26,13 +26,13 @@ use polkadot_primitives::{
 	PersistedValidationData, PvfCheckStatement, ScrapedOnChainVotes, SessionIndex, SessionInfo,
 	ValidationCode, ValidationCodeHash, ValidatorId, ValidatorIndex, ValidatorSignature,
 };
-use sc_client_api::HeaderBackend;
+use sc_client_api::{AuxStore, HeaderBackend};
 use sc_transaction_pool_api::OffchainTransactionPoolFactory;
 use sp_api::{ApiError, ApiExt, ProvideRuntimeApi};
 use sp_authority_discovery::AuthorityDiscoveryApi;
-use sp_blockchain::Info;
+use sp_blockchain::{BlockStatus, Info};
 use sp_consensus_babe::{BabeApi, Epoch};
-use sp_runtime::traits::{Header as HeaderT, NumberFor};
+use sp_runtime::traits::{Block as BlockT, Header as HeaderT, NumberFor};
 use std::{collections::BTreeMap, sync::Arc};
 
 /// Offers header utilities.
@@ -595,3 +595,61 @@ where
 		self.client.runtime_api().approval_voting_params(at)
 	}
 }
+
+impl<Client, Block> HeaderBackend<Block> for DefaultSubsystemClient<Client>
+where
+	Client: HeaderBackend<Block>,
+	Block: sp_runtime::traits::Block,
+{
+	fn header(
+		&self,
+		hash: Block::Hash,
+	) -> sc_client_api::blockchain::Result<Option<Block::Header>> {
+		self.client.header(hash)
+	}
+
+	fn info(&self) -> Info<Block> {
+		self.client.info()
+	}
+
+	fn status(&self, hash: Block::Hash) -> sc_client_api::blockchain::Result<BlockStatus> {
+		self.client.status(hash)
+	}
+
+	fn number(
+		&self,
+		hash: Block::Hash,
+	) -> sc_client_api::blockchain::Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>> {
+		self.client.number(hash)
+	}
+
+	fn hash(
+		&self,
+		number: NumberFor<Block>,
+	) -> sc_client_api::blockchain::Result<Option<Block::Hash>> {
+		self.client.hash(number)
+	}
+}
+
+impl<Client> AuxStore for DefaultSubsystemClient<Client>
+where
+	Client: AuxStore,
+{
+	fn insert_aux<
+		'a,
+		'b: 'a,
+		'c: 'a,
+		I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
+		D: IntoIterator<Item = &'a &'b [u8]>,
+	>(
+		&self,
+		insert: I,
+		delete: D,
+	) -> sp_blockchain::Result<()> {
+		self.client.insert_aux(insert, delete)
+	}
+
+	fn get_aux(&self, key: &[u8]) -> sp_blockchain::Result<Option<Vec<u8>>> {
+		self.client.get_aux(key)
+	}
+}