Rococo/Wococo bridge hub relay integration (#1565)

* [BridgeHub] Added bridge-hub-rococo/wococo clients with bridge-hub-rococo-runtime

* [BridgeHub] Add init-bridge stuff for bridge-hub-rococo/wococo

* [BridgeHub] Add init-bridge stuff for bridge-hub-rococo/wococo

* [BridgeHub] Fixed Call-encoding for init-bridge rococo runtime wrapper

* Final index update to runtime calls

* [BridgeHub] Add init-bridge stuff for bridge-hub-rococo/wococo (otherside)

* Added runtime best_finalized functions + relay-headers init

* Renaming and change BridgeHubRococo/Wococo to Rococo/Wococo config

* [BridgeHub] Add relay-parachains (Rococo/Wococo)

* Missing stuff for adding xcm messaging to BridgeHub

* extracted parachain IDs to the primitives

* fix compilation

* Fixes

* Init setup for Rococo->Wococo messaging support

* Removed unused AccountId from `trait MessagesBridge`

* Removed unused trait SenderOrigin

* Small fixes

* Cleaning after master-merge

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes:
- align WeightToFee with BridgeHubRococo runtime
- MAX_HEADER_SIZE
- updated TODOs

* Added relay_messages cfg for BridgeHubWococo -> BridgeHubRococo

Co-authored-by: Svyatoslav Nikolsky <svyatonik@gmail.com>

bridges/primitives/chain-bridge-hub-rococo/src/lib.rs

@@ -0,0 +1,75 @@
+// 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/>.
+
+//! Module with configuration which reflects BridgeHubRococo runtime setup (AccountId, Headers,
+//! Hashes...)
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use bp_messages::*;
+pub use bp_polkadot_core::*;
+use bp_runtime::{decl_bridge_finality_runtime_apis, decl_bridge_messages_runtime_apis};
+use frame_support::{
+	parameter_types,
+	sp_runtime::{FixedU128, MultiAddress, MultiSigner},
+	weights::{
+		constants::ExtrinsicBaseWeight, WeightToFeeCoefficient, WeightToFeeCoefficients,
+		WeightToFeePolynomial,
+	},
+	Parameter,
+};
+use sp_std::prelude::*;
+
+pub type BridgeHubRococo = PolkadotLike;
+
+/// [`WeightToFee`] should reflect cumulus/bridge-hub-rococo-runtime [`WeightToFee`]
+pub struct WeightToFee;
+impl WeightToFeePolynomial for WeightToFee {
+	type Balance = Balance;
+	fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
+		pub const CENTS: Balance = polkadot_runtime_constants::currency::CENTS;
+
+		// in Rococo, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
+		// in BridgeHub, we map to 1/10 of that, or 1/100 CENT
+		let p = CENTS;
+		let q = 100 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
+		smallvec::smallvec![WeightToFeeCoefficient {
+			degree: 1,
+			negative: false,
+			coeff_frac: Perbill::from_rational(p % q, q),
+			coeff_integer: p / q,
+		}]
+	}
+}
+
+/// Public key of the chain account that may be used to verify signatures.
+pub type AccountSigner = MultiSigner;
+
+/// The address format for describing accounts.
+pub type Address = MultiAddress<AccountId, ()>;
+
+/// Identifier of BridgeHubRococo in the Rococo relay chain.
+pub const BRIDGE_HUB_ROCOCO_PARACHAIN_ID: u32 = 1013;
+
+/// Name of the With-BridgeHubRococo messages pallet instance that is deployed at bridged chains.
+pub const WITH_BRIDGE_HUB_ROCOCO_MESSAGES_PALLET_NAME: &str = "BridgeRococoMessages";
+
+parameter_types! {
+	pub const SS58Prefix: u16 = 42;
+}
+
+decl_bridge_finality_runtime_apis!(bridge_hub_rococo);
+decl_bridge_messages_runtime_apis!(bridge_hub_rococo);