Introduce interface for relay chain interaction

Cargo.toml

@@ -7,6 +7,7 @@ members = [
 	"client/network",
 	"client/pov-recovery",
 	"client/service",
+	"client/relay-chain-interface",
 	"pallets/aura-ext",
 	"pallets/collator-selection",
 	"pallets/dmp-queue",

client/collator/Cargo.toml

@@ -22,6 +22,7 @@ polkadot-node-subsystem = { git = "https://github.com/paritytech/polkadot", bran
 cumulus-client-network = { path = "../network" }
 cumulus-client-consensus-common = { path = "../consensus/common" }
 cumulus-primitives-core = { path = "../../primitives/core" }
+cumulus-relay-chain-interface = { path = "../relay-chain-interface" }
 
 # Other dependencies
 codec = { package = "parity-scale-codec", version = "2.3.0", features = [ "derive" ] }

client/collator/src/lib.rs

@@ -17,7 +17,9 @@
 //! Cumulus Collator implementation for Substrate.
 
 use cumulus_client_network::WaitToAnnounce;
-use cumulus_primitives_core::{CollectCollationInfo, ParachainBlockData, PersistedValidationData};
+use cumulus_primitives_core::{
+	relay_chain::Hash as PHash, CollectCollationInfo, ParachainBlockData, PersistedValidationData,
+};
 
 use sc_client_api::BlockBackend;
 use sp_api::ProvideRuntimeApi;
@@ -34,7 +36,7 @@ use polkadot_node_primitives::{
 };
 use polkadot_node_subsystem::messages::{CollationGenerationMessage, CollatorProtocolMessage};
 use polkadot_overseer::Handle as OverseerHandle;
-use polkadot_primitives::v1::{CollatorPair, Hash as PHash, HeadData, Id as ParaId};
+use polkadot_primitives::v1::{CollatorPair, HeadData, Id as ParaId};
 
 use codec::{Decode, Encode};
 use futures::{channel::oneshot, FutureExt};

client/consensus/aura/Cargo.toml

@@ -24,9 +24,6 @@ sc-telemetry = { git = "https://github.com/paritytech/substrate", branch = "mast
 sc-consensus = { git = "https://github.com/paritytech/substrate", branch = "master" }
 substrate-prometheus-endpoint = { git = "https://github.com/paritytech/substrate", branch = "master" }
 
-# Polkadot dependencies
-polkadot-client = { git = "https://github.com/paritytech/polkadot", branch = "master" }
-
 # Cumulus dependencies
 cumulus-client-consensus-common = { path = "../common" }
 cumulus-primitives-core = { path = "../../../primitives/core" }