Sync Westmint to Millau (paritytech#1482)

* sync Westmint to Millau

* "Westend parachains at Millau" dashboard

bridges/bin/millau/node/src/chain_spec.rs

@@ -144,6 +144,8 @@ fn endowed_accounts() -> Vec<AccountId> {
 		get_account_id_from_seed::<sr25519::Public>("Harry"),
 		get_account_id_from_seed::<sr25519::Public>("Iden"),
 		get_account_id_from_seed::<sr25519::Public>("Ken"),
+		get_account_id_from_seed::<sr25519::Public>("Leon"),
+		get_account_id_from_seed::<sr25519::Public>("Mary"),
 		get_account_id_from_seed::<sr25519::Public>("Alice//stash"),
 		get_account_id_from_seed::<sr25519::Public>("Bob//stash"),
 		get_account_id_from_seed::<sr25519::Public>("Charlie//stash"),
@@ -154,6 +156,8 @@ fn endowed_accounts() -> Vec<AccountId> {
 		get_account_id_from_seed::<sr25519::Public>("Harry//stash"),
 		get_account_id_from_seed::<sr25519::Public>("Iden//stash"),
 		get_account_id_from_seed::<sr25519::Public>("Ken//stash"),
+		get_account_id_from_seed::<sr25519::Public>("Leon//stash"),
+		get_account_id_from_seed::<sr25519::Public>("Mary//stash"),
 		get_account_id_from_seed::<sr25519::Public>("RialtoMessagesOwner"),
 		get_account_id_from_seed::<sr25519::Public>("RialtoParachainMessagesOwner"),
 		pallet_bridge_messages::relayer_fund_account_id::<

bridges/bin/millau/runtime/src/lib.rs

@@ -506,9 +506,10 @@ impl pallet_bridge_messages::Config<WithRialtoParachainMessagesInstance> for Run
 
 parameter_types! {
 	pub const RialtoParasPalletName: &'static str = bp_rialto::PARAS_PALLET_NAME;
+	pub const WestendParasPalletName: &'static str = bp_westend::PARAS_PALLET_NAME;
 }
 
-/// Instance of the with-Rialto parachains token swap pallet.
+/// Instance of the with-Rialto parachains pallet.
 pub type WithRialtoParachainsInstance = ();
 
 impl pallet_bridge_parachains::Config<WithRialtoParachainsInstance> for Runtime {
@@ -519,6 +520,17 @@ impl pallet_bridge_parachains::Config<WithRialtoParachainsInstance> for Runtime
 	type HeadsToKeep = HeadersToKeep;
 }
 
+/// Instance of the with-Westend parachains pallet.
+pub type WithWestendParachainsInstance = pallet_bridge_parachains::Instance1;
+
+impl pallet_bridge_parachains::Config<WithWestendParachainsInstance> for Runtime {
+	type WeightInfo = pallet_bridge_parachains::weights::MillauWeight<Runtime>;
+	type BridgesGrandpaPalletInstance = WestendGrandpaInstance;
+	type ParasPalletName = WestendParasPalletName;
+	type TrackedParachains = frame_support::traits::Everything;
+	type HeadsToKeep = HeadersToKeep;
+}
+
 construct_runtime!(
 	pub enum Runtime where
 		Block = Block,
@@ -552,6 +564,7 @@ construct_runtime!(
 
 		// Westend bridge modules.
 		BridgeWestendGrandpa: pallet_bridge_grandpa::<Instance1>::{Pallet, Call, Config<T>, Storage},
+		BridgeWestendParachains: pallet_bridge_parachains::<Instance1>::{Pallet, Call, Storage},
 
 		// RialtoParachain bridge modules.
 		BridgeRialtoParachains: pallet_bridge_parachains::{Pallet, Call, Storage},
@@ -806,6 +819,20 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl bp_westend::WestmintFinalityApi<Block> for Runtime {
+		fn best_finalized() -> Option<(bp_westend::BlockNumber, bp_westend::Hash)> {
+			// the parachains finality pallet is never decoding parachain heads, so it is
+			// only done in the integration code
+			use bp_westend::WESTMINT_PARACHAIN_ID;
+			let encoded_head = pallet_bridge_parachains::Pallet::<
+				Runtime,
+				WithWestendParachainsInstance,
+			>::best_parachain_head(WESTMINT_PARACHAIN_ID.into())?;
+			let head = bp_westend::Header::decode(&mut &encoded_head.0[..]).ok()?;
+			Some((*head.number(), head.hash()))
+		}
+	}
+
 	impl bp_rialto_parachain::RialtoParachainFinalityApi<Block> for Runtime {
 		fn best_finalized() -> Option<(bp_rialto::BlockNumber, bp_rialto::Hash)> {
 			// the parachains finality pallet is never decoding parachain heads, so it is

bridges/primitives/chain-westend/src/lib.rs

@@ -86,8 +86,13 @@ pub fn derive_account_from_rococo_id(id: bp_runtime::SourceAccount<AccountId>) -
 	AccountIdConverter::convert(encoded_id)
 }
 
+/// Name of the parachains pallet at the Westend runtime.
+pub const PARAS_PALLET_NAME: &str = "Paras";
+
 /// Name of the With-Westend GRANDPA pallet instance that is deployed at bridged chains.
 pub const WITH_WESTEND_GRANDPA_PALLET_NAME: &str = "BridgeWestendGrandpa";
+/// Name of the With-Westend parachains bridge pallet instance that is deployed at bridged chains.
+pub const WITH_WESTEND_BRIDGE_PARAS_PALLET_NAME: &str = "BridgeWestendParachains";
 
 /// Name of the `WestendFinalityApi::best_finalized` runtime method.
 pub const BEST_FINALIZED_WESTEND_HEADER_METHOD: &str = "WestendFinalityApi_best_finalized";
@@ -108,4 +113,19 @@ sp_api::decl_runtime_apis! {
 		/// Returns number and hash of the best finalized header known to the bridge module.
 		fn best_finalized() -> Option<(BlockNumber, Hash)>;
 	}
+
+	/// API for querying information about the finalized Westmint headers.
+	///
+	/// This API is implemented by runtimes that are bridging with the Westmint chain, not the
+	/// Westmint runtime itself.
+	pub trait WestmintFinalityApi {
+		/// Returns number and hash of the best finalized header known to the bridge module.
+		fn best_finalized() -> Option<(BlockNumber, Hash)>;
+	}
 }
+
+/// Identifier of Westmint parachain at the Westend relay chain.
+pub const WESTMINT_PARACHAIN_ID: u32 = 2000;
+
+/// Name of the `WestmintFinalityApi::best_finalized` runtime method.
+pub const BEST_FINALIZED_WESTMINT_HEADER_METHOD: &str = "WestmintFinalityApi_best_finalized";

bridges/relays/bin-substrate/src/chains/mod.rs

@@ -31,6 +31,7 @@ pub mod rialto_parachains_to_millau;
 pub mod rococo_headers_to_wococo;
 pub mod rococo_messages_to_wococo;
 pub mod westend_headers_to_millau;
+pub mod westend_parachains_to_millau;
 pub mod wococo_headers_to_rococo;
 pub mod wococo_messages_to_rococo;
 

bridges/relays/bin-substrate/src/chains/westend_parachains_to_millau.rs

@@ -0,0 +1,52 @@
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
+// This file is part of Parity Bridges Common.
+
+// Parity Bridges Common is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity Bridges Common is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Westend-to-Millau parachains sync entrypoint.
+
+use parachains_relay::ParachainsPipeline;
+use relay_millau_client::Millau;
+use relay_westend_client::{Westend, Westmint};
+use substrate_relay_helper::parachains::{
+	DirectSubmitParachainHeadsCallBuilder, SubstrateParachainsPipeline,
+};
+
+/// Westend-to-Millau parachains sync description.
+#[derive(Clone, Debug)]
+pub struct WestendParachainsToMillau;
+
+impl ParachainsPipeline for WestendParachainsToMillau {
+	type SourceChain = Westend;
+	type TargetChain = Millau;
+}
+
+impl SubstrateParachainsPipeline for WestendParachainsToMillau {
+	type SourceParachain = Westmint;
+	type SourceRelayChain = Westend;
+	type TargetChain = Millau;
+
+	type SubmitParachainHeadsCallBuilder = WestendParachainsToMillauSubmitParachainHeadsCallBuilder;
+	type TransactionSignScheme = Millau;
+
+	const SOURCE_PARACHAIN_PARA_ID: u32 = bp_westend::WESTMINT_PARACHAIN_ID;
+}
+
+/// `submit_parachain_heads` call builder for Rialto-to-Millau parachains sync pipeline.
+pub type WestendParachainsToMillauSubmitParachainHeadsCallBuilder =
+	DirectSubmitParachainHeadsCallBuilder<
+		WestendParachainsToMillau,
+		millau_runtime::Runtime,
+		millau_runtime::WithWestendParachainsInstance,
+	>;

bridges/relays/bin-substrate/src/cli/relay_parachains.rs

@@ -49,6 +49,7 @@ pub struct RelayParachains {
 #[strum(serialize_all = "kebab_case")]
 pub enum RelayParachainsBridge {
 	RialtoToMillau,
+	WestendToMillau,
 }
 
 macro_rules! select_bridge {
@@ -57,6 +58,11 @@ macro_rules! select_bridge {
 			RelayParachainsBridge::RialtoToMillau => {
 				use crate::chains::rialto_parachains_to_millau::RialtoParachainsToMillau as Pipeline;
 
+				$generic
+			},
+			RelayParachainsBridge::WestendToMillau => {
+				use crate::chains::westend_parachains_to_millau::WestendParachainsToMillau as Pipeline;
+
 				$generic
 			},
 		}

bridges/relays/client-westend/src/lib.rs

@@ -17,7 +17,7 @@
 //! Types used to connect to the Westend chain.
 
 use frame_support::weights::Weight;
-use relay_substrate_client::{Chain, ChainBase, ChainWithBalances, ChainWithGrandpa};
+use relay_substrate_client::{Chain, ChainBase, ChainWithBalances, ChainWithGrandpa, RelayChain};
 use sp_core::storage::StorageKey;
 use std::time::Duration;
 
@@ -65,6 +65,12 @@ impl Chain for Westend {
 	type WeightToFee = bp_westend::WeightToFee;
 }
 
+impl RelayChain for Westend {
+	const PARAS_PALLET_NAME: &'static str = bp_westend::PARAS_PALLET_NAME;
+	const PARACHAINS_FINALITY_PALLET_NAME: &'static str =
+		bp_westend::WITH_WESTEND_BRIDGE_PARAS_PALLET_NAME;
+}
+
 impl ChainWithGrandpa for Westend {
 	const WITH_CHAIN_GRANDPA_PALLET_NAME: &'static str =
 		bp_westend::WITH_WESTEND_GRANDPA_PALLET_NAME;
@@ -75,3 +81,45 @@ impl ChainWithBalances for Westend {
 		StorageKey(bp_westend::account_info_storage_key(account_id))
 	}
 }
+
+/// Westmint parachain definition
+#[derive(Debug, Clone, Copy)]
+pub struct Westmint;
+
+// Westmint seems to use the same configuration as all Polkadot-like chains, so we'll use Westend
+// primitives here.
+impl ChainBase for Westmint {
+	type BlockNumber = bp_westend::BlockNumber;
+	type Hash = bp_westend::Hash;
+	type Hasher = bp_westend::Hasher;
+	type Header = bp_westend::Header;
+
+	type AccountId = bp_westend::AccountId;
+	type Balance = bp_westend::Balance;
+	type Index = bp_westend::Nonce;
+	type Signature = bp_westend::Signature;
+
+	fn max_extrinsic_size() -> u32 {
+		bp_westend::Westend::max_extrinsic_size()
+	}
+
+	fn max_extrinsic_weight() -> Weight {
+		bp_westend::Westend::max_extrinsic_weight()
+	}
+}
+
+// Westmint seems to use the same configuration as all Polkadot-like chains, so we'll use Westend
+// primitives here.
+impl Chain for Westmint {
+	const NAME: &'static str = "Westmint";
+	const TOKEN_ID: Option<&'static str> = None;
+	const BEST_FINALIZED_HEADER_ID_METHOD: &'static str =
+		bp_westend::BEST_FINALIZED_WESTMINT_HEADER_METHOD;
+	const AVERAGE_BLOCK_INTERVAL: Duration = Duration::from_secs(6);
+	const STORAGE_PROOF_OVERHEAD: u32 = bp_westend::EXTRA_STORAGE_PROOF_SIZE;
+	const MAXIMAL_ENCODED_ACCOUNT_ID_SIZE: u32 = bp_westend::MAXIMAL_ENCODED_ACCOUNT_ID_SIZE;
+
+	type SignedBlock = bp_westend::SignedBlock;
+	type Call = bp_westend::Call;
+	type WeightToFee = bp_westend::WeightToFee;
+}