Sync Westmint to Millau (#1482)

* sync Westmint to Millau

* "Westend parachains at Millau" dashboard

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;
+}