Chain API subsystem

Cargo.toml

@@ -47,6 +47,7 @@ members = [
  "node/core/backing",
  "node/core/bitfield-signing",
  "node/core/candidate-validation",
+ "node/core/chain-api",
  "node/core/proposer",
  "node/core/runtime-api",
  "node/network/bridge",

node/core/bitfield-signing/src/lib.rs

@@ -26,8 +26,9 @@ use keystore::KeyStorePtr;
 use polkadot_node_subsystem::{
  messages::{
  self, AllMessages, AvailabilityStoreMessage, BitfieldDistributionMessage,
- BitfieldSigningMessage, CandidateBackingMessage, RuntimeApiMessage, RuntimeApiError
+ BitfieldSigningMessage, CandidateBackingMessage, RuntimeApiMessage,
  },
+ errors::RuntimeApiError,
  util::{self, JobManager, JobTrait, ToJobTrait, Validator},
 };
 use polkadot_primitives::v1::{AvailabilityBitfield, CoreState, Hash, ValidatorIndex};

node/core/candidate-validation/src/lib.rs

@@ -26,8 +26,8 @@ use polkadot_subsystem::{
 };
 use polkadot_subsystem::messages::{
  AllMessages, CandidateValidationMessage, RuntimeApiMessage, ValidationFailed, RuntimeApiRequest,
- RuntimeApiError,
 };
+use polkadot_subsystem::errors::RuntimeApiError;
 use polkadot_node_primitives::{ValidationResult, ValidationOutputs};
 use polkadot_primitives::v1::{
  ValidationCode, OmittedValidationData, PoV, CandidateDescriptor, LocalValidationData,

node/core/chain-api/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "polkadot-node-core-chain-api"
+version = "0.1.0"
+authors = ["Parity Technologies <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+futures = { version = "0.3.5" }
+sp-blockchain = { git = "https:/paritytech/substrate", branch = "master" }
+polkadot-primitives = { path = "../../../primitives" }
+polkadot-subsystem = { package = "polkadot-node-subsystem", path = "../../subsystem" }
+
+[dev-dependencies]
+futures = { version = "0.3.5", features = ["thread-pool"] }
+maplit = "1.0.2"
+polkadot-subsystem = { package = "polkadot-node-subsystem", path = "../../subsystem", features = ["test-helpers"] }
+sp-core = { git = "https:/paritytech/substrate", branch = "master" }