Rococo <> Wococo messages relay (#1030)

* MessagesInstance -> BridgedMessagesInstance

* Chain::ID -> Bridge::THIS_CHAIN_ID+Bridge::BRIDGED_CHAIN_ID

* FromBridgedChainEncodedMessageCall<B> -> FromBridgedChainEncodedMessageCall<DecodedCall>

* impl Parameter for ()

* copypaste storage_map_final_key to avoid different runtime references/dummy runtimes

* moved dummy runtime from primitives to relay client

* Rococo <> Wococo messages relays

* send R<>W messages using relay

* fmt

* return Result from get_dispatch_info

* fix benchmarks compilation

* clippy

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

@@ -52,7 +52,7 @@ pub type ToRialtoMessageVerifier = messages::source::FromThisChainMessageVerifie
 pub type FromRialtoMessagePayload = messages::target::FromBridgedChainMessagePayload<WithRialtoMessageBridge>;
 
 /// Encoded Millau Call as it comes from Rialto.
-pub type FromRialtoEncodedCall = messages::target::FromBridgedChainEncodedMessageCall<WithRialtoMessageBridge>;
+pub type FromRialtoEncodedCall = messages::target::FromBridgedChainEncodedMessageCall<crate::Call>;
 
 /// Messages proof for Rialto -> Millau messages.
 type FromRialtoMessagesProof = messages::target::FromBridgedChainMessagesProof<bp_rialto::Hash>;
@@ -74,9 +74,12 @@ pub struct WithRialtoMessageBridge;
 
 impl MessageBridge for WithRialtoMessageBridge {
 	const RELAYER_FEE_PERCENT: u32 = 10;
+	const THIS_CHAIN_ID: ChainId = MILLAU_CHAIN_ID;
+	const BRIDGED_CHAIN_ID: ChainId = RIALTO_CHAIN_ID;
 
 	type ThisChain = Millau;
 	type BridgedChain = Rialto;
+	type BridgedMessagesInstance = crate::WithRialtoMessagesInstance;
 
 	fn bridged_balance_to_this_balance(bridged_balance: bp_rialto::Balance) -> bp_millau::Balance {
 		bp_millau::Balance::try_from(RialtoToMillauConversionRate::get().saturating_mul_int(bridged_balance))
@@ -89,16 +92,12 @@ impl MessageBridge for WithRialtoMessageBridge {
 pub struct Millau;
 
 impl messages::ChainWithMessages for Millau {
-	const ID: ChainId = MILLAU_CHAIN_ID;
-
 	type Hash = bp_millau::Hash;
 	type AccountId = bp_millau::AccountId;
 	type Signer = bp_millau::AccountSigner;
 	type Signature = bp_millau::Signature;
 	type Weight = Weight;
 	type Balance = bp_millau::Balance;
-
-	type MessagesInstance = crate::WithRialtoMessagesInstance;
 }
 
 impl messages::ThisChainWithMessages for Millau {
@@ -145,16 +144,12 @@ impl messages::ThisChainWithMessages for Millau {
 pub struct Rialto;
 
 impl messages::ChainWithMessages for Rialto {
-	const ID: ChainId = RIALTO_CHAIN_ID;
-
 	type Hash = bp_rialto::Hash;
 	type AccountId = bp_rialto::AccountId;
 	type Signer = bp_rialto::AccountSigner;
 	type Signature = bp_rialto::Signature;
 	type Weight = Weight;
 	type Balance = bp_rialto::Balance;
-
-	type MessagesInstance = pallet_bridge_messages::DefaultInstance;
 }
 
 impl messages::BridgedChainWithMessages for Rialto {

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

@@ -915,10 +915,10 @@ impl_runtime_apis! {
 				fn prepare_message_proof(
 					params: MessageProofParams,
 				) -> (millau_messages::FromMillauMessagesProof, Weight) {
-					use crate::millau_messages::{Millau, WithMillauMessageBridge};
+					use crate::millau_messages::WithMillauMessageBridge;
 					use bp_messages::MessageKey;
 					use bridge_runtime_common::{
-						messages::ChainWithMessages,
+						messages::MessageBridge,
 						messages_benchmarking::{ed25519_sign, prepare_message_proof},
 					};
 					use codec::Encode;
@@ -951,13 +951,12 @@ impl_runtime_apis! {
 					}
 
 					let make_millau_message_key = |message_key: MessageKey| storage_keys::message_key::<
-						Runtime,
-						<Millau as ChainWithMessages>::MessagesInstance,
+						<WithMillauMessageBridge as MessageBridge>::BridgedMessagesInstance,
 					>(
 						&message_key.lane_id, message_key.nonce,
 					).0;
 					let make_millau_outbound_lane_data_key = |lane_id| storage_keys::outbound_lane_data_key::<
-						<Millau as ChainWithMessages>::MessagesInstance,
+						<WithMillauMessageBridge as MessageBridge>::BridgedMessagesInstance,
 					>(
 						&lane_id,
 					).0;
@@ -998,18 +997,14 @@ impl_runtime_apis! {
 				fn prepare_message_delivery_proof(
 					params: MessageDeliveryProofParams<Self::AccountId>,
 				) -> millau_messages::ToMillauMessagesDeliveryProof {
-					use crate::millau_messages::{Millau, WithMillauMessageBridge};
-					use bridge_runtime_common::{
-						messages::ChainWithMessages,
-						messages_benchmarking::prepare_message_delivery_proof,
-					};
+					use crate::millau_messages::WithMillauMessageBridge;
+					use bridge_runtime_common::{messages_benchmarking::prepare_message_delivery_proof};
 					use sp_runtime::traits::Header;
 
 					prepare_message_delivery_proof::<WithMillauMessageBridge, bp_millau::Hasher, Runtime, (), _, _>(
 						params,
 						|lane_id| pallet_bridge_messages::storage_keys::inbound_lane_data_key::<
-							Runtime,
-							<Millau as ChainWithMessages>::MessagesInstance,
+							<WithMillauMessageBridge as MessageBridge>::BridgedMessagesInstance,
 						>(
 							&lane_id,
 						).0,

bridges/bin/rialto/runtime/src/millau_messages.rs

@@ -52,7 +52,7 @@ pub type ToMillauMessageVerifier = messages::source::FromThisChainMessageVerifie
 pub type FromMillauMessagePayload = messages::target::FromBridgedChainMessagePayload<WithMillauMessageBridge>;
 
 /// Encoded Rialto Call as it comes from Millau.
-pub type FromMillauEncodedCall = messages::target::FromBridgedChainEncodedMessageCall<WithMillauMessageBridge>;
+pub type FromMillauEncodedCall = messages::target::FromBridgedChainEncodedMessageCall<crate::Call>;
 
 /// Call-dispatch based message dispatch for Millau -> Rialto messages.
 pub type FromMillauMessageDispatch = messages::target::FromBridgedChainMessageDispatch<
@@ -74,9 +74,12 @@ pub struct WithMillauMessageBridge;
 
 impl MessageBridge for WithMillauMessageBridge {
 	const RELAYER_FEE_PERCENT: u32 = 10;
+	const THIS_CHAIN_ID: ChainId = RIALTO_CHAIN_ID;
+	const BRIDGED_CHAIN_ID: ChainId = MILLAU_CHAIN_ID;
 
 	type ThisChain = Rialto;
 	type BridgedChain = Millau;
+	type BridgedMessagesInstance = crate::WithMillauMessagesInstance;
 
 	fn bridged_balance_to_this_balance(bridged_balance: bp_millau::Balance) -> bp_rialto::Balance {
 		bp_rialto::Balance::try_from(MillauToRialtoConversionRate::get().saturating_mul_int(bridged_balance))
@@ -89,16 +92,12 @@ impl MessageBridge for WithMillauMessageBridge {
 pub struct Rialto;
 
 impl messages::ChainWithMessages for Rialto {
-	const ID: ChainId = RIALTO_CHAIN_ID;
-
 	type Hash = bp_rialto::Hash;
 	type AccountId = bp_rialto::AccountId;
 	type Signer = bp_rialto::AccountSigner;
 	type Signature = bp_rialto::Signature;
 	type Weight = Weight;
 	type Balance = bp_rialto::Balance;
-
-	type MessagesInstance = crate::WithMillauMessagesInstance;
 }
 
 impl messages::ThisChainWithMessages for Rialto {
@@ -145,16 +144,12 @@ impl messages::ThisChainWithMessages for Rialto {
 pub struct Millau;
 
 impl messages::ChainWithMessages for Millau {
-	const ID: ChainId = MILLAU_CHAIN_ID;
-
 	type Hash = bp_millau::Hash;
 	type AccountId = bp_millau::AccountId;
 	type Signer = bp_millau::AccountSigner;
 	type Signature = bp_millau::Signature;
 	type Weight = Weight;
 	type Balance = bp_millau::Balance;
-
-	type MessagesInstance = pallet_bridge_messages::DefaultInstance;
 }
 
 impl messages::BridgedChainWithMessages for Millau {

bridges/bin/runtime-common/src/messages.rs

@@ -49,10 +49,17 @@ pub trait MessageBridge {
 	/// Relayer interest (in percents).
 	const RELAYER_FEE_PERCENT: u32;
 
+	/// Identifier of this chain.
+	const THIS_CHAIN_ID: ChainId;
+	/// Identifier of the Bridged chain.
+	const BRIDGED_CHAIN_ID: ChainId;
+
 	/// This chain in context of message bridge.
 	type ThisChain: ThisChainWithMessages;
 	/// Bridged chain in context of message bridge.
 	type BridgedChain: BridgedChainWithMessages;
+	/// Instance of the `pallet-bridge-messages` pallet at the Bridged chain.
+	type BridgedMessagesInstance: Instance;
 
 	/// Convert Bridged chain balance into This chain balance.
 	fn bridged_balance_to_this_balance(bridged_balance: BalanceOf<BridgedChain<Self>>) -> BalanceOf<ThisChain<Self>>;
@@ -60,9 +67,6 @@ pub trait MessageBridge {
 
 /// Chain that has `pallet-bridge-messages` and `dispatch` modules.
 pub trait ChainWithMessages {
-	/// Identifier of this chain.
-	const ID: ChainId;
-
 	/// Hash used in the chain.
 	type Hash: Decode;
 	/// Accound id on the chain.
@@ -78,9 +82,6 @@ pub trait ChainWithMessages {
 	type Weight: From<frame_support::weights::Weight> + PartialOrd;
 	/// Type of balances that is used on the chain.
 	type Balance: Encode + Decode + CheckedAdd + CheckedDiv + CheckedMul + PartialOrd + From<u32> + Copy;
-
-	/// Instance of the `pallet-bridge-messages` pallet.
-	type MessagesInstance: Instance;
 }
 
 /// Message related transaction parameters estimation.
@@ -147,7 +148,6 @@ pub(crate) type SignerOf<C> = <C as ChainWithMessages>::Signer;
 pub(crate) type SignatureOf<C> = <C as ChainWithMessages>::Signature;
 pub(crate) type WeightOf<C> = <C as ChainWithMessages>::Weight;
 pub(crate) type BalanceOf<C> = <C as ChainWithMessages>::Balance;
-pub(crate) type MessagesInstanceOf<C> = <C as ChainWithMessages>::MessagesInstance;
 
 pub(crate) type CallOf<C> = <C as ThisChainWithMessages>::Call;
 
@@ -376,7 +376,6 @@ pub mod source {
 	) -> Result<ParsedMessagesDeliveryProofFromBridgedChain<B>, &'static str>
 	where
 		ThisRuntime: pallet_bridge_grandpa::Config<GrandpaInstance>,
-		ThisRuntime: pallet_bridge_messages::Config<MessagesInstanceOf<BridgedChain<B>>>,
 		HashOf<BridgedChain<B>>:
 			Into<bp_runtime::HashOf<<ThisRuntime as pallet_bridge_grandpa::Config<GrandpaInstance>>::BridgedChain>>,
 	{
@@ -391,10 +390,8 @@ pub mod source {
 			|storage| {
 				// Messages delivery proof is just proof of single storage key read => any error
 				// is fatal.
-				let storage_inbound_lane_data_key = pallet_bridge_messages::storage_keys::inbound_lane_data_key::<
-					ThisRuntime,
-					MessagesInstanceOf<BridgedChain<B>>,
-				>(&lane);
+				let storage_inbound_lane_data_key =
+					pallet_bridge_messages::storage_keys::inbound_lane_data_key::<B::BridgedMessagesInstance>(&lane);
 				let raw_inbound_lane_data = storage
 					.read_value(storage_inbound_lane_data_key.0.as_ref())
 					.map_err(|_| "Failed to read inbound lane state from storage proof")?
@@ -425,7 +422,7 @@ pub mod target {
 		AccountIdOf<BridgedChain<B>>,
 		SignerOf<ThisChain<B>>,
 		SignatureOf<ThisChain<B>>,
-		FromBridgedChainEncodedMessageCall<B>,
+		FromBridgedChainEncodedMessageCall<CallOf<ThisChain<B>>>,
 	>;
 
 	/// Messages proof from bridged chain:
@@ -463,12 +460,12 @@ pub mod target {
 	/// Our Call is opaque (`Vec<u8>`) for Bridged chain. So it is encoded, prefixed with
 	/// vector length. Custom decode implementation here is exactly to deal with this.
 	#[derive(Decode, Encode, RuntimeDebug, PartialEq)]
-	pub struct FromBridgedChainEncodedMessageCall<B> {
+	pub struct FromBridgedChainEncodedMessageCall<DecodedCall> {
 		encoded_call: Vec<u8>,
-		_marker: PhantomData<B>,
+		_marker: PhantomData<DecodedCall>,
 	}
 
-	impl<B: MessageBridge> FromBridgedChainEncodedMessageCall<B> {
+	impl<DecodedCall> FromBridgedChainEncodedMessageCall<DecodedCall> {
 		/// Create encoded call.
 		pub fn new(encoded_call: Vec<u8>) -> Self {
 			FromBridgedChainEncodedMessageCall {
@@ -478,9 +475,9 @@ pub mod target {
 		}
 	}
 
-	impl<B: MessageBridge> From<FromBridgedChainEncodedMessageCall<B>> for Result<CallOf<ThisChain<B>>, ()> {
-		fn from(encoded_call: FromBridgedChainEncodedMessageCall<B>) -> Self {
-			CallOf::<ThisChain<B>>::decode(&mut &encoded_call.encoded_call[..]).map_err(drop)
+	impl<DecodedCall: Decode> From<FromBridgedChainEncodedMessageCall<DecodedCall>> for Result<DecodedCall, ()> {
+		fn from(encoded_call: FromBridgedChainEncodedMessageCall<DecodedCall>) -> Self {
+			DecodedCall::decode(&mut &encoded_call.encoded_call[..]).map_err(drop)
 		}
 	}
 
@@ -523,8 +520,8 @@ pub mod target {
 		) -> MessageDispatchResult {
 			let message_id = (message.key.lane_id, message.key.nonce);
 			pallet_bridge_dispatch::Pallet::<ThisRuntime, ThisDispatchInstance>::dispatch(
-				B::BridgedChain::ID,
-				B::ThisChain::ID,
+				B::BRIDGED_CHAIN_ID,
+				B::THIS_CHAIN_ID,
 				message_id,
 				message.data.payload.map_err(drop),
 				|dispatch_origin, dispatch_weight| {
@@ -561,7 +558,7 @@ pub mod target {
 	) -> Result<ProvedMessages<Message<BalanceOf<BridgedChain<B>>>>, &'static str>
 	where
 		ThisRuntime: pallet_bridge_grandpa::Config<GrandpaInstance>,
-		ThisRuntime: pallet_bridge_messages::Config<MessagesInstanceOf<BridgedChain<B>>>,
+		ThisRuntime: pallet_bridge_messages::Config<B::BridgedMessagesInstance>,
 		HashOf<BridgedChain<B>>:
 			Into<bp_runtime::HashOf<<ThisRuntime as pallet_bridge_grandpa::Config<GrandpaInstance>>::BridgedChain>>,
 	{
@@ -574,7 +571,7 @@ pub mod target {
 					StorageProof::new(bridged_storage_proof),
 					|storage_adapter| storage_adapter,
 				)
-				.map(|storage| StorageProofCheckerAdapter::<_, B, ThisRuntime> {
+				.map(|storage| StorageProofCheckerAdapter::<_, B> {
 					storage,
 					_dummy: Default::default(),
 				})
@@ -614,31 +611,29 @@ pub mod target {
 		fn read_raw_message(&self, message_key: &MessageKey) -> Option<Vec<u8>>;
 	}
 
-	struct StorageProofCheckerAdapter<H: Hasher, B, ThisRuntime> {
+	struct StorageProofCheckerAdapter<H: Hasher, B> {
 		storage: StorageProofChecker<H>,
-		_dummy: sp_std::marker::PhantomData<(B, ThisRuntime)>,
+		_dummy: sp_std::marker::PhantomData<B>,
 	}
 
-	impl<H, B, ThisRuntime> MessageProofParser for StorageProofCheckerAdapter<H, B, ThisRuntime>
+	impl<H, B> MessageProofParser for StorageProofCheckerAdapter<H, B>
 	where
 		H: Hasher,
 		B: MessageBridge,
-		ThisRuntime: pallet_bridge_messages::Config<MessagesInstanceOf<BridgedChain<B>>>,
 	{
 		fn read_raw_outbound_lane_data(&self, lane_id: &LaneId) -> Option<Vec<u8>> {
-			let storage_outbound_lane_data_key = pallet_bridge_messages::storage_keys::outbound_lane_data_key::<
-				MessagesInstanceOf<BridgedChain<B>>,
-			>(lane_id);
+			let storage_outbound_lane_data_key =
+				pallet_bridge_messages::storage_keys::outbound_lane_data_key::<B::BridgedMessagesInstance>(lane_id);
 			self.storage
 				.read_value(storage_outbound_lane_data_key.0.as_ref())
 				.ok()?
 		}
 
 		fn read_raw_message(&self, message_key: &MessageKey) -> Option<Vec<u8>> {
-			let storage_message_key = pallet_bridge_messages::storage_keys::message_key::<
-				ThisRuntime,
-				MessagesInstanceOf<BridgedChain<B>>,
-			>(&message_key.lane_id, message_key.nonce);
+			let storage_message_key = pallet_bridge_messages::storage_keys::message_key::<B::BridgedMessagesInstance>(
+				&message_key.lane_id,
+				message_key.nonce,
+			);
 			self.storage.read_value(storage_message_key.0.as_ref()).ok()?
 		}
 	}
@@ -743,9 +738,12 @@ mod tests {
 
 	impl MessageBridge for OnThisChainBridge {
 		const RELAYER_FEE_PERCENT: u32 = 10;
+		const THIS_CHAIN_ID: ChainId = *b"this";
+		const BRIDGED_CHAIN_ID: ChainId = *b"brdg";
 
 		type ThisChain = ThisChain;
 		type BridgedChain = BridgedChain;
+		type BridgedMessagesInstance = pallet_bridge_messages::DefaultInstance;
 
 		fn bridged_balance_to_this_balance(bridged_balance: BridgedChainBalance) -> ThisChainBalance {
 			ThisChainBalance(bridged_balance.0 * BRIDGED_CHAIN_TO_THIS_CHAIN_BALANCE_RATE as u32)
@@ -758,9 +756,12 @@ mod tests {
 
 	impl MessageBridge for OnBridgedChainBridge {
 		const RELAYER_FEE_PERCENT: u32 = 20;
+		const THIS_CHAIN_ID: ChainId = *b"brdg";
+		const BRIDGED_CHAIN_ID: ChainId = *b"this";
 
 		type ThisChain = BridgedChain;
 		type BridgedChain = ThisChain;
+		type BridgedMessagesInstance = pallet_bridge_messages::DefaultInstance;
 
 		fn bridged_balance_to_this_balance(_this_balance: ThisChainBalance) -> BridgedChainBalance {
 			unreachable!()
@@ -857,16 +858,12 @@ mod tests {
 	struct ThisChain;
 
 	impl ChainWithMessages for ThisChain {
-		const ID: ChainId = *b"this";
-
 		type Hash = ();
 		type AccountId = ThisChainAccountId;
 		type Signer = ThisChainSigner;
 		type Signature = ThisChainSignature;
 		type Weight = frame_support::weights::Weight;
 		type Balance = ThisChainBalance;
-
-		type MessagesInstance = pallet_bridge_messages::DefaultInstance;
 	}
 
 	impl ThisChainWithMessages for ThisChain {
@@ -917,16 +914,12 @@ mod tests {
 	struct BridgedChain;
 
 	impl ChainWithMessages for BridgedChain {
-		const ID: ChainId = *b"brdg";
-
 		type Hash = ();
 		type AccountId = BridgedChainAccountId;
 		type Signer = BridgedChainSigner;
 		type Signature = BridgedChainSignature;
 		type Weight = frame_support::weights::Weight;
 		type Balance = BridgedChainBalance;
-
-		type MessagesInstance = pallet_bridge_messages::DefaultInstance;
 	}
 
 	impl ThisChainWithMessages for BridgedChain {
@@ -1002,7 +995,7 @@ mod tests {
 				weight: 100,
 				origin: bp_message_dispatch::CallOrigin::SourceRoot,
 				dispatch_fee_payment: DispatchFeePayment::AtTargetChain,
-				call: target::FromBridgedChainEncodedMessageCall::<OnThisChainBridge>::new(
+				call: target::FromBridgedChainEncodedMessageCall::<ThisChainCall>::new(
 					ThisChainCall::Transfer.encode(),
 				),
 			}

bridges/modules/messages/src/lib.rs

@@ -755,24 +755,38 @@ impl<T: Config<I>, I: Instance> Pallet<T, I> {
 /// trying to avoid here) - by using strings like "Instance2", "OutboundMessages", etc.
 pub mod storage_keys {
 	use super::*;
-	use frame_support::storage::generator::StorageMap;
+	use frame_support::{traits::Instance, StorageHasher};
 	use sp_core::storage::StorageKey;
 
 	/// Storage key of the outbound message in the runtime storage.
-	pub fn message_key<T: Config<I>, I: Instance>(lane: &LaneId, nonce: MessageNonce) -> StorageKey {
-		let message_key = MessageKey { lane_id: *lane, nonce };
-		let raw_storage_key = OutboundMessages::<T, I>::storage_map_final_key(message_key);
-		StorageKey(raw_storage_key)
+	pub fn message_key<I: Instance>(lane: &LaneId, nonce: MessageNonce) -> StorageKey {
+		storage_map_final_key::<I>("OutboundMessages", &MessageKey { lane_id: *lane, nonce }.encode())
 	}
 
 	/// Storage key of the outbound message lane state in the runtime storage.
 	pub fn outbound_lane_data_key<I: Instance>(lane: &LaneId) -> StorageKey {
-		StorageKey(OutboundLanes::<I>::storage_map_final_key(*lane))
+		storage_map_final_key::<I>("OutboundLanes", lane)
 	}
 
 	/// Storage key of the inbound message lane state in the runtime storage.
-	pub fn inbound_lane_data_key<T: Config<I>, I: Instance>(lane: &LaneId) -> StorageKey {
-		StorageKey(InboundLanes::<T, I>::storage_map_final_key(*lane))
+	pub fn inbound_lane_data_key<I: Instance>(lane: &LaneId) -> StorageKey {
+		storage_map_final_key::<I>("InboundLanes", lane)
+	}
+
+	/// This is a copypaste of the `frame_support::storage::generator::StorageMap::storage_map_final_key`.
+	fn storage_map_final_key<I: Instance>(map_name: &str, key: &[u8]) -> StorageKey {
+		let module_prefix_hashed = frame_support::Twox128::hash(I::PREFIX.as_bytes());
+		let storage_prefix_hashed = frame_support::Twox128::hash(map_name.as_bytes());
+		let key_hashed = frame_support::Blake2_128Concat::hash(key);
+
+		let mut final_key =
+			Vec::with_capacity(module_prefix_hashed.len() + storage_prefix_hashed.len() + key_hashed.len());
+
+		final_key.extend_from_slice(&module_prefix_hashed[..]);
+		final_key.extend_from_slice(&storage_prefix_hashed[..]);
+		final_key.extend_from_slice(key_hashed.as_ref());
+
+		StorageKey(final_key)
 	}
 }
 
@@ -1685,7 +1699,7 @@ mod tests {
 	fn storage_message_key_computed_properly() {
 		// If this test fails, then something has been changed in module storage that is breaking all
 		// previously crafted messages proofs.
-		let storage_key = storage_keys::message_key::<TestRuntime, DefaultInstance>(&*b"test", 42).0;
+		let storage_key = storage_keys::message_key::<DefaultInstance>(&*b"test", 42).0;
 		assert_eq!(
 			storage_key,
 			hex!("dd16c784ebd3390a9bc0357c7511ed018a395e6242c6813b196ca31ed0547ea79446af0e09063bd4a7874aef8a997cec746573742a00000000000000").to_vec(),
@@ -1711,7 +1725,7 @@ mod tests {
 	fn inbound_lane_data_key_computed_properly() {
 		// If this test fails, then something has been changed in module storage that is breaking all
 		// previously crafted inbound lane state proofs.
-		let storage_key = storage_keys::inbound_lane_data_key::<TestRuntime, DefaultInstance>(&*b"test").0;
+		let storage_key = storage_keys::inbound_lane_data_key::<DefaultInstance>(&*b"test").0;
 		assert_eq!(
 			storage_key,
 			hex!("dd16c784ebd3390a9bc0357c7511ed01e5f83cf83f2127eb47afdc35d6e43fab44a8995dd50b6657a037a7839304535b74657374").to_vec(),

bridges/primitives/chain-rococo/Cargo.toml

@@ -11,7 +11,6 @@ parity-scale-codec = { version = "2.0.0", default-features = false, features = [
 smallvec = "1.6"
 
 # Bridge Dependencies
-bp-header-chain = { path = "../header-chain", default-features = false }
 bp-messages = { path = "../messages", default-features = false }
 bp-polkadot-core = { path = "../polkadot-core", default-features = false }
 bp-runtime = { path = "../runtime", default-features = false }
@@ -26,7 +25,6 @@ sp-version = { git = "https://github.com/paritytech/substrate", branch = "master
 [features]
 default = ["std"]
 std = [
-	"bp-header-chain/std",
 	"bp-messages/std",
 	"bp-polkadot-core/std",
 	"bp-runtime/std",

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

@@ -21,7 +21,6 @@
 #![allow(clippy::unnecessary_mut_passed)]
 
 use bp_messages::{LaneId, MessageDetails, MessageNonce, UnrewardedRelayersState};
-use bp_runtime::Chain;
 use frame_support::weights::{WeightToFeeCoefficient, WeightToFeeCoefficients, WeightToFeePolynomial};
 use sp_std::prelude::*;
 use sp_version::RuntimeVersion;
@@ -31,7 +30,12 @@ pub use bp_polkadot_core::*;
 /// Rococo Chain
 pub type Rococo = PolkadotLike;
 
-pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
+/// The target length of a session (how often authorities change) on Westend measured in of number of
+/// blocks.
+///
+/// Note that since this is a target sessions may change before/after this time depending on network
+/// conditions.
+pub const SESSION_LENGTH: BlockNumber = 10 * time_units::MINUTES;
 
 // NOTE: This needs to be kept up to date with the Rococo runtime found in the Polkadot repo.
 pub const VERSION: RuntimeVersion = RuntimeVersion {
@@ -61,44 +65,11 @@ impl WeightToFeePolynomial for WeightToFee {
 	}
 }
 
-/// Rococo Runtime `Call` enum.
-///
-/// The enum represents a subset of possible `Call`s we can send to Rococo chain.
-/// Ideally this code would be auto-generated from Metadata, because we want to
-/// avoid depending directly on the ENTIRE runtime just to get the encoding of `Dispatchable`s.
-///
-/// All entries here (like pretty much in the entire file) must be kept in sync with Rococo
-/// `construct_runtime`, so that we maintain SCALE-compatibility.
-///
-/// See: https://github.com/paritytech/polkadot/blob/master/runtime/rococo/src/lib.rs
-#[derive(parity_scale_codec::Encode, parity_scale_codec::Decode, Debug, PartialEq, Eq, Clone)]
-pub enum Call {
-	/// Wococo bridge pallet.
-	#[codec(index = 41)]
-	BridgeGrandpaWococo(BridgeGrandpaWococoCall),
-}
-
-#[derive(parity_scale_codec::Encode, parity_scale_codec::Decode, Debug, PartialEq, Eq, Clone)]
-#[allow(non_camel_case_types)]
-pub enum BridgeGrandpaWococoCall {
-	#[codec(index = 0)]
-	submit_finality_proof(
-		<PolkadotLike as Chain>::Header,
-		bp_header_chain::justification::GrandpaJustification<<PolkadotLike as Chain>::Header>,
-	),
-	#[codec(index = 1)]
-	initialize(bp_header_chain::InitializationData<<PolkadotLike as Chain>::Header>),
-}
-
-impl sp_runtime::traits::Dispatchable for Call {
-	type Origin = ();
-	type Config = ();
-	type Info = ();
-	type PostInfo = ();
-
-	fn dispatch(self, _origin: Self::Origin) -> sp_runtime::DispatchResultWithInfo<Self::PostInfo> {
-		unimplemented!("The Call is not expected to be dispatched.")
-	}
+// We use this to get the account on Rococo (target) which is derived from Wococo's (source)
+// account.
+pub fn derive_account_from_wococo_id(id: bp_runtime::SourceAccount<AccountId>) -> AccountId {
+	let encoded_id = bp_runtime::derive_account_id(bp_runtime::WOCOCO_CHAIN_ID, id);
+	AccountIdConverter::convert(encoded_id)
 }
 
 /// Name of the `RococoFinalityApi::best_finalized` runtime method.

bridges/primitives/chain-wococo/Cargo.toml

@@ -10,7 +10,6 @@ license = "GPL-3.0-or-later WITH Classpath-exception-2.0"
 parity-scale-codec = { version = "2.0.0", default-features = false, features = ["derive"] }
 
 # Bridge Dependencies
-bp-header-chain = { path = "../header-chain", default-features = false }
 bp-messages = { path = "../messages", default-features = false }
 bp-polkadot-core = { path = "../polkadot-core", default-features = false }
 bp-rococo = { path = "../chain-rococo", default-features = false }
@@ -24,7 +23,6 @@ sp-std = { git = "https://github.com/paritytech/substrate", branch = "master", d
 [features]
 default = ["std"]
 std = [
-	"bp-header-chain/std",
 	"bp-messages/std",
 	"bp-polkadot-core/std",
 	"bp-runtime/std",

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

@@ -21,58 +21,15 @@
 #![allow(clippy::unnecessary_mut_passed)]
 
 use bp_messages::{LaneId, MessageDetails, MessageNonce, UnrewardedRelayersState};
-use bp_runtime::Chain;
 use sp_std::prelude::*;
 
 pub use bp_polkadot_core::*;
 // Rococo runtime = Wococo runtime
-pub use bp_rococo::{WeightToFee, VERSION};
+pub use bp_rococo::{WeightToFee, SESSION_LENGTH, VERSION};
 
 /// Wococo Chain
 pub type Wococo = PolkadotLike;
 
-pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
-
-/// Wococo Runtime `Call` enum.
-///
-/// The enum represents a subset of possible `Call`s we can send to Rococo chain.
-/// Ideally this code would be auto-generated from Metadata, because we want to
-/// avoid depending directly on the ENTIRE runtime just to get the encoding of `Dispatchable`s.
-///
-/// All entries here (like pretty much in the entire file) must be kept in sync with Rococo
-/// `construct_runtime`, so that we maintain SCALE-compatibility.
-///
-/// See: https://github.com/paritytech/polkadot/blob/master/runtime/rococo/src/lib.rs
-#[derive(parity_scale_codec::Encode, parity_scale_codec::Decode, Debug, PartialEq, Eq, Clone)]
-pub enum Call {
-	/// Rococo bridge pallet.
-	#[codec(index = 40)]
-	BridgeGrandpaRococo(BridgeGrandpaRococoCall),
-}
-
-#[derive(parity_scale_codec::Encode, parity_scale_codec::Decode, Debug, PartialEq, Eq, Clone)]
-#[allow(non_camel_case_types)]
-pub enum BridgeGrandpaRococoCall {
-	#[codec(index = 0)]
-	submit_finality_proof(
-		<PolkadotLike as Chain>::Header,
-		bp_header_chain::justification::GrandpaJustification<<PolkadotLike as Chain>::Header>,
-	),
-	#[codec(index = 1)]
-	initialize(bp_header_chain::InitializationData<<PolkadotLike as Chain>::Header>),
-}
-
-impl sp_runtime::traits::Dispatchable for Call {
-	type Origin = ();
-	type Config = ();
-	type Info = ();
-	type PostInfo = ();
-
-	fn dispatch(self, _origin: Self::Origin) -> sp_runtime::DispatchResultWithInfo<Self::PostInfo> {
-		unimplemented!("The Call is not expected to be dispatched.")
-	}
-}
-
 // We use this to get the account on Wococo (target) which is derived from Rococo's (source)
 // account.
 pub fn derive_account_from_rococo_id(id: bp_runtime::SourceAccount<AccountId>) -> AccountId {

bridges/primitives/messages/src/lib.rs

@@ -64,6 +64,10 @@ pub trait Parameter: frame_support::Parameter {
 	fn save(&self);
 }
 
+impl Parameter for () {
+	fn save(&self) {}
+}
+
 /// Lane identifier.
 pub type LaneId = [u8; 4];
 

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

@@ -23,7 +23,7 @@ use crate::cli::{
 };
 use bp_message_dispatch::{CallOrigin, MessagePayload};
 use codec::Decode;
-use frame_support::weights::{GetDispatchInfo, Weight};
+use frame_support::weights::{DispatchInfo, GetDispatchInfo, Weight};
 use relay_millau_client::Millau;
 use sp_version::RuntimeVersion;
 
@@ -62,6 +62,10 @@ impl CliEncodeCall for Millau {
 			},
 		})
 	}
+
+	fn get_dispatch_info(call: &millau_runtime::Call) -> anyhow::Result<DispatchInfo> {
+		Ok(call.get_dispatch_info())
+	}
 }
 
 impl CliChain for Millau {

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

@@ -126,20 +126,12 @@ impl SubstrateMessageLane for MillauMessagesToRialto {
 }
 
 /// Millau node as messages source.
-type MillauSourceClient = SubstrateMessagesSource<
-	Millau,
-	MillauMessagesToRialto,
-	millau_runtime::Runtime,
-	millau_runtime::WithRialtoMessagesInstance,
->;
+type MillauSourceClient =
+	SubstrateMessagesSource<Millau, MillauMessagesToRialto, millau_runtime::WithRialtoMessagesInstance>;
 
 /// Rialto node as messages target.
-type RialtoTargetClient = SubstrateMessagesTarget<
-	Rialto,
-	MillauMessagesToRialto,
-	rialto_runtime::Runtime,
-	rialto_runtime::WithMillauMessagesInstance,
->;
+type RialtoTargetClient =
+	SubstrateMessagesTarget<Rialto, MillauMessagesToRialto, rialto_runtime::WithMillauMessagesInstance>;
 
 /// Run Millau-to-Rialto messages sync.
 pub async fn run(

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

@@ -21,8 +21,10 @@ pub mod millau_messages_to_rialto;
 pub mod rialto_headers_to_millau;
 pub mod rialto_messages_to_millau;
 pub mod rococo_headers_to_wococo;
+pub mod rococo_messages_to_wococo;
 pub mod westend_headers_to_millau;
 pub mod wococo_headers_to_rococo;
+pub mod wococo_messages_to_rococo;
 
 mod millau;
 mod rialto;
@@ -271,7 +273,10 @@ mod rococo_tests {
 			votes_ancestries: vec![],
 		};
 
-		let actual = bp_rococo::BridgeGrandpaWococoCall::submit_finality_proof(header.clone(), justification.clone());
+		let actual = relay_rococo_client::runtime::BridgeGrandpaWococoCall::submit_finality_proof(
+			header.clone(),
+			justification.clone(),
+		);
 		let expected = millau_runtime::BridgeGrandpaRialtoCall::<millau_runtime::Runtime>::submit_finality_proof(
 			header,
 			justification,

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

@@ -23,7 +23,7 @@ use crate::cli::{
 };
 use bp_message_dispatch::{CallOrigin, MessagePayload};
 use codec::Decode;
-use frame_support::weights::{GetDispatchInfo, Weight};
+use frame_support::weights::{DispatchInfo, GetDispatchInfo, Weight};
 use relay_rialto_client::Rialto;
 use sp_version::RuntimeVersion;
 
@@ -60,6 +60,10 @@ impl CliEncodeCall for Rialto {
 			},
 		})
 	}
+
+	fn get_dispatch_info(call: &rialto_runtime::Call) -> anyhow::Result<DispatchInfo> {
+		Ok(call.get_dispatch_info())
+	}
 }
 
 impl CliChain for Rialto {

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

@@ -126,20 +126,12 @@ impl SubstrateMessageLane for RialtoMessagesToMillau {
 }
 
 /// Rialto node as messages source.
-type RialtoSourceClient = SubstrateMessagesSource<
-	Rialto,
-	RialtoMessagesToMillau,
-	rialto_runtime::Runtime,
-	rialto_runtime::WithMillauMessagesInstance,
->;
+type RialtoSourceClient =
+	SubstrateMessagesSource<Rialto, RialtoMessagesToMillau, rialto_runtime::WithMillauMessagesInstance>;
 
 /// Millau node as messages target.
-type MillauTargetClient = SubstrateMessagesTarget<
-	Millau,
-	RialtoMessagesToMillau,
-	millau_runtime::Runtime,
-	millau_runtime::WithRialtoMessagesInstance,
->;
+type MillauTargetClient =
+	SubstrateMessagesTarget<Millau, RialtoMessagesToMillau, millau_runtime::WithRialtoMessagesInstance>;
 
 /// Run Rialto-to-Millau messages sync.
 pub async fn run(

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

@@ -14,11 +14,70 @@
 // 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/>.
 
-use crate::cli::{encode_message, CliChain};
-use frame_support::weights::Weight;
+use codec::Decode;
+use frame_support::weights::{DispatchClass, DispatchInfo, Pays, Weight};
 use relay_rococo_client::Rococo;
 use sp_version::RuntimeVersion;
 
+use crate::cli::{
+	bridge,
+	encode_call::{Call, CliEncodeCall},
+	encode_message, CliChain,
+};
+
+/// Weight of the `system::remark` call at Rococo.
+///
+/// This weight is larger (x2) than actual weight at current Rooco runtime to avoid unsuccessful
+/// calls in the future. But since it is used only in tests (and on test chains), this is ok.
+pub(crate) const SYSTEM_REMARK_CALL_WEIGHT: Weight = 2 * 1_345_000;
+
+impl CliEncodeCall for Rococo {
+	fn max_extrinsic_size() -> u32 {
+		bp_rococo::max_extrinsic_size()
+	}
+
+	fn encode_call(call: &Call) -> anyhow::Result<Self::Call> {
+		Ok(match call {
+			Call::Remark { remark_payload, .. } => {
+				relay_rococo_client::runtime::Call::System(relay_rococo_client::runtime::SystemCall::remark(
+					remark_payload.as_ref().map(|x| x.0.clone()).unwrap_or_default(),
+				))
+			}
+			Call::BridgeSendMessage {
+				lane,
+				payload,
+				fee,
+				bridge_instance_index,
+			} => match *bridge_instance_index {
+				bridge::ROCOCO_TO_WOCOCO_INDEX => {
+					let payload = Decode::decode(&mut &*payload.0)?;
+					relay_rococo_client::runtime::Call::BridgeMessagesWococo(
+						relay_rococo_client::runtime::BridgeMessagesWococoCall::send_message(lane.0, payload, fee.0),
+					)
+				}
+				_ => anyhow::bail!(
+					"Unsupported target bridge pallet with instance index: {}",
+					bridge_instance_index
+				),
+			},
+			_ => anyhow::bail!("The call is not supported"),
+		})
+	}
+
+	fn get_dispatch_info(call: &relay_rococo_client::runtime::Call) -> anyhow::Result<DispatchInfo> {
+		match *call {
+			relay_rococo_client::runtime::Call::System(relay_rococo_client::runtime::SystemCall::remark(_)) => {
+				Ok(DispatchInfo {
+					weight: SYSTEM_REMARK_CALL_WEIGHT,
+					class: DispatchClass::Normal,
+					pays_fee: Pays::Yes,
+				})
+			}
+			_ => anyhow::bail!("Unsupported Rococo call: {:?}", call),
+		}
+	}
+}
+
 impl CliChain for Rococo {
 	const RUNTIME_VERSION: RuntimeVersion = bp_rococo::VERSION;
 
@@ -30,7 +89,7 @@ impl CliChain for Rococo {
 	}
 
 	fn max_extrinsic_weight() -> Weight {
-		0
+		bp_wococo::max_extrinsic_weight()
 	}
 
 	fn encode_message(_message: encode_message::MessagePayload) -> Result<Self::MessagePayload, String> {

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

@@ -61,10 +61,9 @@ impl SubstrateFinalitySyncPipeline for RococoFinalityToWococo {
 		header: RococoSyncHeader,
 		proof: GrandpaJustification<bp_rococo::Header>,
 	) -> Bytes {
-		let call = bp_wococo::Call::BridgeGrandpaRococo(bp_wococo::BridgeGrandpaRococoCall::submit_finality_proof(
-			header.into_inner(),
-			proof,
-		));
+		let call = relay_wococo_client::runtime::Call::BridgeGrandpaRococo(
+			relay_wococo_client::runtime::BridgeGrandpaRococoCall::submit_finality_proof(header.into_inner(), proof),
+		);
 		let genesis_hash = *self.target_client.genesis_hash();
 		let transaction = Wococo::sign_transaction(genesis_hash, &self.target_sign, transaction_nonce, call);
 

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

@@ -0,0 +1,227 @@
+// 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/>.
+
+//! Rococo-to-Wococo messages sync entrypoint.
+
+use crate::messages_lane::{
+	select_delivery_transaction_limits, MessagesRelayParams, SubstrateMessageLane, SubstrateMessageLaneToSubstrate,
+};
+use crate::messages_source::SubstrateMessagesSource;
+use crate::messages_target::SubstrateMessagesTarget;
+
+use bp_messages::MessageNonce;
+use bp_runtime::{ROCOCO_CHAIN_ID, WOCOCO_CHAIN_ID};
+use bridge_runtime_common::messages::target::FromBridgedChainMessagesProof;
+use codec::Encode;
+use messages_relay::message_lane::MessageLane;
+use relay_rococo_client::{HeaderId as RococoHeaderId, Rococo, SigningParams as RococoSigningParams};
+use relay_substrate_client::{metrics::StorageProofOverheadMetric, Chain, TransactionSignScheme};
+use relay_wococo_client::{HeaderId as WococoHeaderId, SigningParams as WococoSigningParams, Wococo};
+use sp_core::{Bytes, Pair};
+use std::{ops::RangeInclusive, time::Duration};
+
+/// Rococo-to-Wococo message lane.
+pub type RococoMessagesToWococo =
+	SubstrateMessageLaneToSubstrate<Rococo, RococoSigningParams, Wococo, WococoSigningParams>;
+
+impl SubstrateMessageLane for RococoMessagesToWococo {
+	const OUTBOUND_LANE_MESSAGE_DETAILS_METHOD: &'static str = bp_wococo::TO_WOCOCO_MESSAGE_DETAILS_METHOD;
+	const OUTBOUND_LANE_LATEST_GENERATED_NONCE_METHOD: &'static str =
+		bp_wococo::TO_WOCOCO_LATEST_GENERATED_NONCE_METHOD;
+	const OUTBOUND_LANE_LATEST_RECEIVED_NONCE_METHOD: &'static str = bp_wococo::TO_WOCOCO_LATEST_RECEIVED_NONCE_METHOD;
+
+	const INBOUND_LANE_LATEST_RECEIVED_NONCE_METHOD: &'static str = bp_rococo::FROM_ROCOCO_LATEST_RECEIVED_NONCE_METHOD;
+	const INBOUND_LANE_LATEST_CONFIRMED_NONCE_METHOD: &'static str =
+		bp_rococo::FROM_ROCOCO_LATEST_CONFIRMED_NONCE_METHOD;
+	const INBOUND_LANE_UNREWARDED_RELAYERS_STATE: &'static str = bp_rococo::FROM_ROCOCO_UNREWARDED_RELAYERS_STATE;
+
+	const BEST_FINALIZED_SOURCE_HEADER_ID_AT_TARGET: &'static str = bp_rococo::BEST_FINALIZED_ROCOCO_HEADER_METHOD;
+	const BEST_FINALIZED_TARGET_HEADER_ID_AT_SOURCE: &'static str = bp_wococo::BEST_FINALIZED_WOCOCO_HEADER_METHOD;
+
+	type SourceChain = Rococo;
+	type TargetChain = Wococo;
+
+	fn source_transactions_author(&self) -> bp_rococo::AccountId {
+		(*self.source_sign.public().as_array_ref()).into()
+	}
+
+	fn make_messages_receiving_proof_transaction(
+		&self,
+		transaction_nonce: <Rococo as Chain>::Index,
+		_generated_at_block: WococoHeaderId,
+		proof: <Self as MessageLane>::MessagesReceivingProof,
+	) -> Bytes {
+		let (relayers_state, proof) = proof;
+		let call = relay_rococo_client::runtime::Call::BridgeMessagesWococo(
+			relay_rococo_client::runtime::BridgeMessagesWococoCall::receive_messages_delivery_proof(
+				proof,
+				relayers_state,
+			),
+		);
+		let genesis_hash = *self.source_client.genesis_hash();
+		let transaction = Rococo::sign_transaction(genesis_hash, &self.source_sign, transaction_nonce, call);
+		log::trace!(
+			target: "bridge",
+			"Prepared Wococo -> Rococo confirmation transaction. Weight: <unknown>/{}, size: {}/{}",
+			bp_rococo::max_extrinsic_weight(),
+			transaction.encode().len(),
+			bp_rococo::max_extrinsic_size(),
+		);
+		Bytes(transaction.encode())
+	}
+
+	fn target_transactions_author(&self) -> bp_wococo::AccountId {
+		(*self.target_sign.public().as_array_ref()).into()
+	}
+
+	fn make_messages_delivery_transaction(
+		&self,
+		transaction_nonce: <Wococo as Chain>::Index,
+		_generated_at_header: RococoHeaderId,
+		_nonces: RangeInclusive<MessageNonce>,
+		proof: <Self as MessageLane>::MessagesProof,
+	) -> Bytes {
+		let (dispatch_weight, proof) = proof;
+		let FromBridgedChainMessagesProof {
+			ref nonces_start,
+			ref nonces_end,
+			..
+		} = proof;
+		let messages_count = nonces_end - nonces_start + 1;
+
+		let call = relay_wococo_client::runtime::Call::BridgeMessagesRococo(
+			relay_wococo_client::runtime::BridgeMessagesRococoCall::receive_messages_proof(
+				self.relayer_id_at_source.clone(),
+				proof,
+				messages_count as _,
+				dispatch_weight,
+			),
+		);
+		let genesis_hash = *self.target_client.genesis_hash();
+		let transaction = Wococo::sign_transaction(genesis_hash, &self.target_sign, transaction_nonce, call);
+		log::trace!(
+			target: "bridge",
+			"Prepared Rococo -> Wococo delivery transaction. Weight: <unknown>/{}, size: {}/{}",
+			bp_wococo::max_extrinsic_weight(),
+			transaction.encode().len(),
+			bp_wococo::max_extrinsic_size(),
+		);
+		Bytes(transaction.encode())
+	}
+}
+
+/// Rococo node as messages source.
+type RococoSourceClient =
+	SubstrateMessagesSource<Rococo, RococoMessagesToWococo, relay_rococo_client::runtime::WithWococoMessagesInstance>;
+
+/// Wococo node as messages target.
+type WococoTargetClient =
+	SubstrateMessagesTarget<Wococo, RococoMessagesToWococo, relay_wococo_client::runtime::WithRococoMessagesInstance>;
+
+/// Run Rococo-to-Wococo messages sync.
+pub async fn run(
+	params: MessagesRelayParams<Rococo, RococoSigningParams, Wococo, WococoSigningParams>,
+) -> Result<(), String> {
+	let stall_timeout = Duration::from_secs(5 * 60);
+	let relayer_id_at_rococo = (*params.source_sign.public().as_array_ref()).into();
+
+	let lane_id = params.lane_id;
+	let source_client = params.source_client;
+	let lane = RococoMessagesToWococo {
+		source_client: source_client.clone(),
+		source_sign: params.source_sign,
+		target_client: params.target_client.clone(),
+		target_sign: params.target_sign,
+		relayer_id_at_source: relayer_id_at_rococo,
+	};
+
+	// 2/3 is reserved for proofs and tx overhead
+	let max_messages_size_in_single_batch = bp_wococo::max_extrinsic_size() / 3;
+	// we don't know exact weights of the Wococo runtime. So to guess weights we'll be using
+	// weights from Rialto and then simply dividing it by x2.
+	let (max_messages_in_single_batch, max_messages_weight_in_single_batch) =
+		select_delivery_transaction_limits::<pallet_bridge_messages::weights::RialtoWeight<rialto_runtime::Runtime>>(
+			bp_wococo::max_extrinsic_weight(),
+			bp_wococo::MAX_UNREWARDED_RELAYER_ENTRIES_AT_INBOUND_LANE,
+		);
+	let (max_messages_in_single_batch, max_messages_weight_in_single_batch) = (
+		max_messages_in_single_batch / 2,
+		max_messages_weight_in_single_batch / 2,
+	);
+
+	log::info!(
+		target: "bridge",
+		"Starting Rococo -> Wococo messages relay.\n\t\
+			Rococo relayer account id: {:?}\n\t\
+			Max messages in single transaction: {}\n\t\
+			Max messages size in single transaction: {}\n\t\
+			Max messages weight in single transaction: {}",
+		lane.relayer_id_at_source,
+		max_messages_in_single_batch,
+		max_messages_size_in_single_batch,
+		max_messages_weight_in_single_batch,
+	);
+
+	messages_relay::message_lane_loop::run(
+		messages_relay::message_lane_loop::Params {
+			lane: lane_id,
+			source_tick: Rococo::AVERAGE_BLOCK_INTERVAL,
+			target_tick: Wococo::AVERAGE_BLOCK_INTERVAL,
+			reconnect_delay: relay_utils::relay_loop::RECONNECT_DELAY,
+			stall_timeout,
+			delivery_params: messages_relay::message_lane_loop::MessageDeliveryParams {
+				max_unrewarded_relayer_entries_at_target: bp_wococo::MAX_UNREWARDED_RELAYER_ENTRIES_AT_INBOUND_LANE,
+				max_unconfirmed_nonces_at_target: bp_wococo::MAX_UNCONFIRMED_MESSAGES_AT_INBOUND_LANE,
+				max_messages_in_single_batch,
+				max_messages_weight_in_single_batch,
+				max_messages_size_in_single_batch,
+				relayer_mode: messages_relay::message_lane_loop::RelayerMode::Altruistic,
+			},
+		},
+		RococoSourceClient::new(
+			source_client.clone(),
+			lane.clone(),
+			lane_id,
+			WOCOCO_CHAIN_ID,
+			params.target_to_source_headers_relay,
+		),
+		WococoTargetClient::new(
+			params.target_client,
+			lane,
+			lane_id,
+			ROCOCO_CHAIN_ID,
+			params.source_to_target_headers_relay,
+		),
+		relay_utils::relay_metrics(
+			Some(messages_relay::message_lane_loop::metrics_prefix::<
+				RococoMessagesToWococo,
+			>(&lane_id)),
+			params.metrics_params,
+		)
+		.standalone_metric(|registry, prefix| {
+			StorageProofOverheadMetric::new(
+				registry,
+				prefix,
+				source_client.clone(),
+				"rococo_storage_proof_overhead".into(),
+				"Rococo storage proof overhead".into(),
+			)
+		})?
+		.into_params(),
+		futures::future::pending(),
+	)
+	.await
+}

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

@@ -14,11 +14,64 @@
 // 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/>.
 
-use crate::cli::{encode_message, CliChain};
-use frame_support::weights::Weight;
+use codec::Decode;
+use frame_support::weights::{DispatchClass, DispatchInfo, Pays, Weight};
 use relay_wococo_client::Wococo;
 use sp_version::RuntimeVersion;
 
+use crate::cli::{
+	bridge,
+	encode_call::{Call, CliEncodeCall},
+	encode_message, CliChain,
+};
+
+impl CliEncodeCall for Wococo {
+	fn max_extrinsic_size() -> u32 {
+		bp_wococo::max_extrinsic_size()
+	}
+
+	fn encode_call(call: &Call) -> anyhow::Result<Self::Call> {
+		Ok(match call {
+			Call::Remark { remark_payload, .. } => {
+				relay_wococo_client::runtime::Call::System(relay_wococo_client::runtime::SystemCall::remark(
+					remark_payload.as_ref().map(|x| x.0.clone()).unwrap_or_default(),
+				))
+			}
+			Call::BridgeSendMessage {
+				lane,
+				payload,
+				fee,
+				bridge_instance_index,
+			} => match *bridge_instance_index {
+				bridge::WOCOCO_TO_ROCOCO_INDEX => {
+					let payload = Decode::decode(&mut &*payload.0)?;
+					relay_wococo_client::runtime::Call::BridgeMessagesRococo(
+						relay_wococo_client::runtime::BridgeMessagesRococoCall::send_message(lane.0, payload, fee.0),
+					)
+				}
+				_ => anyhow::bail!(
+					"Unsupported target bridge pallet with instance index: {}",
+					bridge_instance_index
+				),
+			},
+			_ => anyhow::bail!("The call is not supported"),
+		})
+	}
+
+	fn get_dispatch_info(call: &relay_wococo_client::runtime::Call) -> anyhow::Result<DispatchInfo> {
+		match *call {
+			relay_wococo_client::runtime::Call::System(relay_wococo_client::runtime::SystemCall::remark(_)) => {
+				Ok(DispatchInfo {
+					weight: crate::chains::rococo::SYSTEM_REMARK_CALL_WEIGHT,
+					class: DispatchClass::Normal,
+					pays_fee: Pays::Yes,
+				})
+			}
+			_ => anyhow::bail!("Unsupported Rococo call: {:?}", call),
+		}
+	}
+}
+
 impl CliChain for Wococo {
 	const RUNTIME_VERSION: RuntimeVersion = bp_wococo::VERSION;
 
@@ -30,7 +83,7 @@ impl CliChain for Wococo {
 	}
 
 	fn max_extrinsic_weight() -> Weight {
-		0
+		bp_wococo::max_extrinsic_weight()
 	}
 
 	fn encode_message(_message: encode_message::MessagePayload) -> Result<Self::MessagePayload, String> {

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

@@ -67,10 +67,9 @@ impl SubstrateFinalitySyncPipeline for WococoFinalityToRococo {
 		header: WococoSyncHeader,
 		proof: GrandpaJustification<bp_wococo::Header>,
 	) -> Bytes {
-		let call = bp_rococo::Call::BridgeGrandpaWococo(bp_rococo::BridgeGrandpaWococoCall::submit_finality_proof(
-			header.into_inner(),
-			proof,
-		));
+		let call = relay_rococo_client::runtime::Call::BridgeGrandpaWococo(
+			relay_rococo_client::runtime::BridgeGrandpaWococoCall::submit_finality_proof(header.into_inner(), proof),
+		);
 		let genesis_hash = *self.target_client.genesis_hash();
 		let transaction = Rococo::sign_transaction(genesis_hash, &self.target_sign, transaction_nonce, call);
 

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

@@ -0,0 +1,227 @@
+// 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/>.
+
+//! Wococo-to-Rococo messages sync entrypoint.
+
+use crate::messages_lane::{
+	select_delivery_transaction_limits, MessagesRelayParams, SubstrateMessageLane, SubstrateMessageLaneToSubstrate,
+};
+use crate::messages_source::SubstrateMessagesSource;
+use crate::messages_target::SubstrateMessagesTarget;
+
+use bp_messages::MessageNonce;
+use bp_runtime::{ROCOCO_CHAIN_ID, WOCOCO_CHAIN_ID};
+use bridge_runtime_common::messages::target::FromBridgedChainMessagesProof;
+use codec::Encode;
+use messages_relay::message_lane::MessageLane;
+use relay_rococo_client::{HeaderId as RococoHeaderId, Rococo, SigningParams as RococoSigningParams};
+use relay_substrate_client::{metrics::StorageProofOverheadMetric, Chain, TransactionSignScheme};
+use relay_wococo_client::{HeaderId as WococoHeaderId, SigningParams as WococoSigningParams, Wococo};
+use sp_core::{Bytes, Pair};
+use std::{ops::RangeInclusive, time::Duration};
+
+/// Wococo-to-Rococo message lane.
+pub type WococoMessagesToRococo =
+	SubstrateMessageLaneToSubstrate<Wococo, WococoSigningParams, Rococo, RococoSigningParams>;
+
+impl SubstrateMessageLane for WococoMessagesToRococo {
+	const OUTBOUND_LANE_MESSAGE_DETAILS_METHOD: &'static str = bp_rococo::TO_ROCOCO_MESSAGE_DETAILS_METHOD;
+	const OUTBOUND_LANE_LATEST_GENERATED_NONCE_METHOD: &'static str =
+		bp_rococo::TO_ROCOCO_LATEST_GENERATED_NONCE_METHOD;
+	const OUTBOUND_LANE_LATEST_RECEIVED_NONCE_METHOD: &'static str = bp_rococo::TO_ROCOCO_LATEST_RECEIVED_NONCE_METHOD;
+
+	const INBOUND_LANE_LATEST_RECEIVED_NONCE_METHOD: &'static str = bp_wococo::FROM_WOCOCO_LATEST_RECEIVED_NONCE_METHOD;
+	const INBOUND_LANE_LATEST_CONFIRMED_NONCE_METHOD: &'static str =
+		bp_wococo::FROM_WOCOCO_LATEST_CONFIRMED_NONCE_METHOD;
+	const INBOUND_LANE_UNREWARDED_RELAYERS_STATE: &'static str = bp_wococo::FROM_WOCOCO_UNREWARDED_RELAYERS_STATE;
+
+	const BEST_FINALIZED_SOURCE_HEADER_ID_AT_TARGET: &'static str = bp_wococo::BEST_FINALIZED_WOCOCO_HEADER_METHOD;
+	const BEST_FINALIZED_TARGET_HEADER_ID_AT_SOURCE: &'static str = bp_rococo::BEST_FINALIZED_ROCOCO_HEADER_METHOD;
+
+	type SourceChain = Wococo;
+	type TargetChain = Rococo;
+
+	fn source_transactions_author(&self) -> bp_wococo::AccountId {
+		(*self.source_sign.public().as_array_ref()).into()
+	}
+
+	fn make_messages_receiving_proof_transaction(
+		&self,
+		transaction_nonce: <Wococo as Chain>::Index,
+		_generated_at_block: RococoHeaderId,
+		proof: <Self as MessageLane>::MessagesReceivingProof,
+	) -> Bytes {
+		let (relayers_state, proof) = proof;
+		let call = relay_wococo_client::runtime::Call::BridgeMessagesRococo(
+			relay_wococo_client::runtime::BridgeMessagesRococoCall::receive_messages_delivery_proof(
+				proof,
+				relayers_state,
+			),
+		);
+		let genesis_hash = *self.source_client.genesis_hash();
+		let transaction = Wococo::sign_transaction(genesis_hash, &self.source_sign, transaction_nonce, call);
+		log::trace!(
+			target: "bridge",
+			"Prepared Rococo -> Wococo confirmation transaction. Weight: <unknown>/{}, size: {}/{}",
+			bp_wococo::max_extrinsic_weight(),
+			transaction.encode().len(),
+			bp_wococo::max_extrinsic_size(),
+		);
+		Bytes(transaction.encode())
+	}
+
+	fn target_transactions_author(&self) -> bp_rococo::AccountId {
+		(*self.target_sign.public().as_array_ref()).into()
+	}
+
+	fn make_messages_delivery_transaction(
+		&self,
+		transaction_nonce: <Rococo as Chain>::Index,
+		_generated_at_header: WococoHeaderId,
+		_nonces: RangeInclusive<MessageNonce>,
+		proof: <Self as MessageLane>::MessagesProof,
+	) -> Bytes {
+		let (dispatch_weight, proof) = proof;
+		let FromBridgedChainMessagesProof {
+			ref nonces_start,
+			ref nonces_end,
+			..
+		} = proof;
+		let messages_count = nonces_end - nonces_start + 1;
+
+		let call = relay_rococo_client::runtime::Call::BridgeMessagesWococo(
+			relay_rococo_client::runtime::BridgeMessagesWococoCall::receive_messages_proof(
+				self.relayer_id_at_source.clone(),
+				proof,
+				messages_count as _,
+				dispatch_weight,
+			),
+		);
+		let genesis_hash = *self.target_client.genesis_hash();
+		let transaction = Rococo::sign_transaction(genesis_hash, &self.target_sign, transaction_nonce, call);
+		log::trace!(
+			target: "bridge",
+			"Prepared Wococo -> Rococo delivery transaction. Weight: <unknown>/{}, size: {}/{}",
+			bp_rococo::max_extrinsic_weight(),
+			transaction.encode().len(),
+			bp_rococo::max_extrinsic_size(),
+		);
+		Bytes(transaction.encode())
+	}
+}
+
+/// Wococo node as messages source.
+type WococoSourceClient =
+	SubstrateMessagesSource<Wococo, WococoMessagesToRococo, relay_wococo_client::runtime::WithRococoMessagesInstance>;
+
+/// Rococo node as messages target.
+type RococoTargetClient =
+	SubstrateMessagesTarget<Rococo, WococoMessagesToRococo, relay_rococo_client::runtime::WithWococoMessagesInstance>;
+
+/// Run Wococo-to-Rococo messages sync.
+pub async fn run(
+	params: MessagesRelayParams<Wococo, WococoSigningParams, Rococo, RococoSigningParams>,
+) -> Result<(), String> {
+	let stall_timeout = Duration::from_secs(5 * 60);
+	let relayer_id_at_wococo = (*params.source_sign.public().as_array_ref()).into();
+
+	let lane_id = params.lane_id;
+	let source_client = params.source_client;
+	let lane = WococoMessagesToRococo {
+		source_client: source_client.clone(),
+		source_sign: params.source_sign,
+		target_client: params.target_client.clone(),
+		target_sign: params.target_sign,
+		relayer_id_at_source: relayer_id_at_wococo,
+	};
+
+	// 2/3 is reserved for proofs and tx overhead
+	let max_messages_size_in_single_batch = bp_rococo::max_extrinsic_size() / 3;
+	// we don't know exact weights of the Rococo runtime. So to guess weights we'll be using
+	// weights from Rialto and then simply dividing it by x2.
+	let (max_messages_in_single_batch, max_messages_weight_in_single_batch) =
+		select_delivery_transaction_limits::<pallet_bridge_messages::weights::RialtoWeight<rialto_runtime::Runtime>>(
+			bp_rococo::max_extrinsic_weight(),
+			bp_rococo::MAX_UNREWARDED_RELAYER_ENTRIES_AT_INBOUND_LANE,
+		);
+	let (max_messages_in_single_batch, max_messages_weight_in_single_batch) = (
+		max_messages_in_single_batch / 2,
+		max_messages_weight_in_single_batch / 2,
+	);
+
+	log::info!(
+		target: "bridge",
+		"Starting Wococo -> Rococo messages relay.\n\t\
+			Wococo relayer account id: {:?}\n\t\
+			Max messages in single transaction: {}\n\t\
+			Max messages size in single transaction: {}\n\t\
+			Max messages weight in single transaction: {}",
+		lane.relayer_id_at_source,
+		max_messages_in_single_batch,
+		max_messages_size_in_single_batch,
+		max_messages_weight_in_single_batch,
+	);
+
+	messages_relay::message_lane_loop::run(
+		messages_relay::message_lane_loop::Params {
+			lane: lane_id,
+			source_tick: Wococo::AVERAGE_BLOCK_INTERVAL,
+			target_tick: Rococo::AVERAGE_BLOCK_INTERVAL,
+			reconnect_delay: relay_utils::relay_loop::RECONNECT_DELAY,
+			stall_timeout,
+			delivery_params: messages_relay::message_lane_loop::MessageDeliveryParams {
+				max_unrewarded_relayer_entries_at_target: bp_rococo::MAX_UNREWARDED_RELAYER_ENTRIES_AT_INBOUND_LANE,
+				max_unconfirmed_nonces_at_target: bp_rococo::MAX_UNCONFIRMED_MESSAGES_AT_INBOUND_LANE,
+				max_messages_in_single_batch,
+				max_messages_weight_in_single_batch,
+				max_messages_size_in_single_batch,
+				relayer_mode: messages_relay::message_lane_loop::RelayerMode::Altruistic,
+			},
+		},
+		WococoSourceClient::new(
+			source_client.clone(),
+			lane.clone(),
+			lane_id,
+			ROCOCO_CHAIN_ID,
+			params.target_to_source_headers_relay,
+		),
+		RococoTargetClient::new(
+			params.target_client,
+			lane,
+			lane_id,
+			WOCOCO_CHAIN_ID,
+			params.source_to_target_headers_relay,
+		),
+		relay_utils::relay_metrics(
+			Some(messages_relay::message_lane_loop::metrics_prefix::<
+				WococoMessagesToRococo,
+			>(&lane_id)),
+			params.metrics_params,
+		)
+		.standalone_metric(|registry, prefix| {
+			StorageProofOverheadMetric::new(
+				registry,
+				prefix,
+				source_client.clone(),
+				"wococo_storage_proof_overhead".into(),
+				"Wococo storage proof overhead".into(),
+			)
+		})?
+		.into_params(),
+		futures::future::pending(),
+	)
+	.await
+}

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

@@ -22,6 +22,8 @@ arg_enum! {
 	pub enum FullBridge {
 		MillauToRialto,
 		RialtoToMillau,
+		RococoToWococo,
+		WococoToRococo,
 	}
 }
 
@@ -31,12 +33,16 @@ impl FullBridge {
 		match self {
 			Self::MillauToRialto => MILLAU_TO_RIALTO_INDEX,
 			Self::RialtoToMillau => RIALTO_TO_MILLAU_INDEX,
+			Self::RococoToWococo => ROCOCO_TO_WOCOCO_INDEX,
+			Self::WococoToRococo => WOCOCO_TO_ROCOCO_INDEX,
 		}
 	}
 }
 
 pub const RIALTO_TO_MILLAU_INDEX: u8 = 0;
 pub const MILLAU_TO_RIALTO_INDEX: u8 = 0;
+pub const ROCOCO_TO_WOCOCO_INDEX: u8 = 0;
+pub const WOCOCO_TO_ROCOCO_INDEX: u8 = 0;
 
 /// The macro allows executing bridge-specific code without going fully generic.
 ///
@@ -89,6 +95,50 @@ macro_rules! select_full_bridge {
 				#[allow(unused_imports)]
 				use rialto_runtime::rialto_to_millau_account_ownership_digest as account_ownership_digest;
 
+				$generic
+			}
+			FullBridge::RococoToWococo => {
+				type Source = relay_rococo_client::Rococo;
+				#[allow(dead_code)]
+				type Target = relay_wococo_client::Wococo;
+
+				// Derive-account
+				#[allow(unused_imports)]
+				use bp_wococo::derive_account_from_rococo_id as derive_account;
+
+				// Relay-messages
+				#[allow(unused_imports)]
+				use crate::chains::rococo_messages_to_wococo::run as relay_messages;
+
+				// Send-message / Estimate-fee
+				#[allow(unused_imports)]
+				use bp_wococo::TO_WOCOCO_ESTIMATE_MESSAGE_FEE_METHOD as ESTIMATE_MESSAGE_FEE_METHOD;
+				// Send-message
+				#[allow(unused_imports)]
+				use relay_rococo_client::runtime::rococo_to_wococo_account_ownership_digest as account_ownership_digest;
+
+				$generic
+			}
+			FullBridge::WococoToRococo => {
+				type Source = relay_wococo_client::Wococo;
+				#[allow(dead_code)]
+				type Target = relay_rococo_client::Rococo;
+
+				// Derive-account
+				#[allow(unused_imports)]
+				use bp_rococo::derive_account_from_wococo_id as derive_account;
+
+				// Relay-messages
+				#[allow(unused_imports)]
+				use crate::chains::wococo_messages_to_rococo::run as relay_messages;
+
+				// Send-message / Estimate-fee
+				#[allow(unused_imports)]
+				use bp_rococo::TO_ROCOCO_ESTIMATE_MESSAGE_FEE_METHOD as ESTIMATE_MESSAGE_FEE_METHOD;
+				// Send-message
+				#[allow(unused_imports)]
+				use relay_wococo_client::runtime::wococo_to_rococo_account_ownership_digest as account_ownership_digest;
+
 				$generic
 			}
 		}

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

@@ -17,7 +17,7 @@
 use crate::cli::bridge::FullBridge;
 use crate::cli::{AccountId, Balance, CliChain, ExplicitOrMaximal, HexBytes, HexLaneId};
 use crate::select_full_bridge;
-use frame_support::dispatch::GetDispatchInfo;
+use frame_support::weights::DispatchInfo;
 use relay_substrate_client::Chain;
 use structopt::StructOpt;
 
@@ -85,6 +85,9 @@ pub trait CliEncodeCall: Chain {
 
 	/// Encode a CLI call.
 	fn encode_call(call: &Call) -> anyhow::Result<Self::Call>;
+
+	/// Get dispatch info for the call.
+	fn get_dispatch_info(call: &Self::Call) -> anyhow::Result<DispatchInfo>;
 }
 
 impl EncodeCall {
@@ -96,7 +99,7 @@ impl EncodeCall {
 			let encoded = HexBytes::encode(&call);
 
 			log::info!(target: "bridge", "Generated {} call: {:#?}", Source::NAME, call);
-			log::info!(target: "bridge", "Weight of {} call: {}", Source::NAME, call.get_dispatch_info().weight);
+			log::info!(target: "bridge", "Weight of {} call: {}", Source::NAME, Source::get_dispatch_info(&call)?.weight);
 			log::info!(target: "bridge", "Encoded {} call: {:?}", Source::NAME, encoded);
 
 			Ok(encoded)

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

@@ -109,7 +109,9 @@ macro_rules! select_bridge {
 				fn encode_init_bridge(
 					init_data: InitializationData<<Source as ChainBase>::Header>,
 				) -> <Target as Chain>::Call {
-					bp_wococo::Call::BridgeGrandpaRococo(bp_wococo::BridgeGrandpaRococoCall::initialize(init_data))
+					relay_wococo_client::runtime::Call::BridgeGrandpaRococo(
+						relay_wococo_client::runtime::BridgeGrandpaRococoCall::initialize(init_data),
+					)
 				}
 
 				$generic
@@ -121,7 +123,9 @@ macro_rules! select_bridge {
 				fn encode_init_bridge(
 					init_data: InitializationData<<Source as ChainBase>::Header>,
 				) -> <Target as Chain>::Call {
-					bp_rococo::Call::BridgeGrandpaWococo(bp_rococo::BridgeGrandpaWococoCall::initialize(init_data))
+					relay_rococo_client::runtime::Call::BridgeGrandpaWococo(
+						relay_rococo_client::runtime::BridgeGrandpaWococoCall::initialize(init_data),
+					)
 				}
 
 				$generic

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

@@ -35,6 +35,7 @@ use structopt::StructOpt;
 #[derive(StructOpt)]
 pub enum RelayHeadersAndMessages {
 	MillauRialto(MillauRialtoHeadersAndMessages),
+	RococoWococo(RococoWococoHeadersAndMessages),
 }
 
 /// Parameters that have the same names across all bridges.
@@ -102,6 +103,26 @@ macro_rules! select_bridge {
 				use crate::chains::millau_messages_to_rialto::run as left_to_right_messages;
 				use crate::chains::rialto_messages_to_millau::run as right_to_left_messages;
 
+				$generic
+			}
+			RelayHeadersAndMessages::RococoWococo(_) => {
+				type Params = RococoWococoHeadersAndMessages;
+
+				type Left = relay_rococo_client::Rococo;
+				type Right = relay_wococo_client::Wococo;
+
+				type LeftToRightFinality = crate::chains::rococo_headers_to_wococo::RococoFinalityToWococo;
+				type RightToLeftFinality = crate::chains::wococo_headers_to_rococo::WococoFinalityToRococo;
+
+				type LeftToRightMessages = crate::chains::rococo_messages_to_wococo::RococoMessagesToWococo;
+				type RightToLeftMessages = crate::chains::wococo_messages_to_rococo::WococoMessagesToRococo;
+
+				const MAX_MISSING_LEFT_HEADERS_AT_RIGHT: bp_rococo::BlockNumber = bp_rococo::SESSION_LENGTH;
+				const MAX_MISSING_RIGHT_HEADERS_AT_LEFT: bp_wococo::BlockNumber = bp_wococo::SESSION_LENGTH;
+
+				use crate::chains::rococo_messages_to_wococo::run as left_to_right_messages;
+				use crate::chains::wococo_messages_to_rococo::run as right_to_left_messages;
+
 				$generic
 			}
 		}
@@ -111,8 +132,11 @@ macro_rules! select_bridge {
 // All supported chains.
 declare_chain_options!(Millau, millau);
 declare_chain_options!(Rialto, rialto);
+declare_chain_options!(Rococo, rococo);
+declare_chain_options!(Wococo, wococo);
 // All supported bridges.
 declare_bridge_options!(Millau, Rialto);
+declare_bridge_options!(Rococo, Wococo);
 
 impl RelayHeadersAndMessages {
 	/// Run the command.

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

@@ -24,7 +24,7 @@ use crate::cli::{
 use bp_message_dispatch::{CallOrigin, MessagePayload};
 use bp_runtime::messages::DispatchFeePayment;
 use codec::Encode;
-use frame_support::{dispatch::GetDispatchInfo, weights::Weight};
+use frame_support::weights::Weight;
 use relay_substrate_client::{Chain, TransactionSignScheme};
 use sp_core::{Bytes, Pair};
 use sp_runtime::{traits::IdentifyAccount, AccountId32, MultiSignature, MultiSigner};
@@ -89,7 +89,7 @@ impl SendMessage {
 			let payload = {
 				let target_call_weight = prepare_call_dispatch_weight(
 					dispatch_weight,
-					ExplicitOrMaximal::Explicit(target_call.get_dispatch_info().weight),
+					ExplicitOrMaximal::Explicit(Target::get_dispatch_info(&target_call)?.weight),
 					compute_maximal_message_dispatch_weight(Target::max_extrinsic_weight()),
 				);
 				let source_sender_public: MultiSigner = source_sign.public().into();

bridges/relays/bin-substrate/src/messages_source.rs

@@ -33,7 +33,6 @@ use messages_relay::{
 		ClientState, MessageDetails, MessageDetailsMap, MessageProofParameters, SourceClient, SourceClientState,
 	},
 };
-use pallet_bridge_messages::Config as MessagesConfig;
 use relay_substrate_client::{Chain, Client, Error as SubstrateError, HashOf, HeaderIdOf};
 use relay_utils::{relay_loop::Client as RelayClient, BlockNumberBase, HeaderId};
 use sp_core::Bytes;
@@ -46,16 +45,16 @@ use std::{marker::PhantomData, ops::RangeInclusive};
 pub type SubstrateMessagesProof<C> = (Weight, FromBridgedChainMessagesProof<HashOf<C>>);
 
 /// Substrate client as Substrate messages source.
-pub struct SubstrateMessagesSource<C: Chain, P: SubstrateMessageLane, R, I> {
+pub struct SubstrateMessagesSource<C: Chain, P: SubstrateMessageLane, I> {
 	client: Client<C>,
 	lane: P,
 	lane_id: LaneId,
 	instance: ChainId,
 	target_to_source_headers_relay: Option<OnDemandHeadersRelay<P::TargetChain>>,
-	_phantom: PhantomData<(R, I)>,
+	_phantom: PhantomData<I>,
 }
 
-impl<C: Chain, P: SubstrateMessageLane, R, I> SubstrateMessagesSource<C, P, R, I> {
+impl<C: Chain, P: SubstrateMessageLane, I> SubstrateMessagesSource<C, P, I> {
 	/// Create new Substrate headers source.
 	pub fn new(
 		client: Client<C>,
@@ -75,7 +74,7 @@ impl<C: Chain, P: SubstrateMessageLane, R, I> SubstrateMessagesSource<C, P, R, I
 	}
 }
 
-impl<C: Chain, P: SubstrateMessageLane, R, I> Clone for SubstrateMessagesSource<C, P, R, I> {
+impl<C: Chain, P: SubstrateMessageLane, I> Clone for SubstrateMessagesSource<C, P, I> {
 	fn clone(&self) -> Self {
 		Self {
 			client: self.client.clone(),
@@ -89,11 +88,10 @@ impl<C: Chain, P: SubstrateMessageLane, R, I> Clone for SubstrateMessagesSource<
 }
 
 #[async_trait]
-impl<C, P, R, I> RelayClient for SubstrateMessagesSource<C, P, R, I>
+impl<C, P, I> RelayClient for SubstrateMessagesSource<C, P, I>
 where
 	C: Chain,
 	P: SubstrateMessageLane,
-	R: 'static + Send + Sync,
 	I: Send + Sync + Instance,
 {
 	type Error = SubstrateError;
@@ -104,7 +102,7 @@ where
 }
 
 #[async_trait]
-impl<C, P, R, I> SourceClient<P> for SubstrateMessagesSource<C, P, R, I>
+impl<C, P, I> SourceClient<P> for SubstrateMessagesSource<C, P, I>
 where
 	C: Chain,
 	C::Header: DeserializeOwned,
@@ -120,7 +118,6 @@ where
 	P::TargetChain: Chain<Hash = P::TargetHeaderHash, BlockNumber = P::TargetHeaderNumber>,
 	P::TargetHeaderNumber: Decode,
 	P::TargetHeaderHash: Decode,
-	R: Send + Sync + MessagesConfig<I>,
 	I: Send + Sync + Instance,
 {
 	async fn state(&self) -> Result<SourceClientState<P>, SubstrateError> {
@@ -198,7 +195,7 @@ where
 		let mut storage_keys = Vec::with_capacity(nonces.end().saturating_sub(*nonces.start()) as usize + 1);
 		let mut message_nonce = *nonces.start();
 		while message_nonce <= *nonces.end() {
-			let message_key = pallet_bridge_messages::storage_keys::message_key::<R, I>(&self.lane_id, message_nonce);
+			let message_key = pallet_bridge_messages::storage_keys::message_key::<I>(&self.lane_id, message_nonce);
 			storage_keys.push(message_key);
 			message_nonce += 1;
 		}

bridges/relays/bin-substrate/src/messages_target.rs

@@ -32,7 +32,6 @@ use messages_relay::{
 	message_lane::{SourceHeaderIdOf, TargetHeaderIdOf},
 	message_lane_loop::{TargetClient, TargetClientState},
 };
-use pallet_bridge_messages::Config as MessagesConfig;
 use relay_substrate_client::{Chain, Client, Error as SubstrateError, HashOf};
 use relay_utils::{relay_loop::Client as RelayClient, BlockNumberBase};
 use sp_core::Bytes;
@@ -46,16 +45,16 @@ pub type SubstrateMessagesReceivingProof<C> = (
 );
 
 /// Substrate client as Substrate messages target.
-pub struct SubstrateMessagesTarget<C: Chain, P: SubstrateMessageLane, R, I> {
+pub struct SubstrateMessagesTarget<C: Chain, P: SubstrateMessageLane, I> {
 	client: Client<C>,
 	lane: P,
 	lane_id: LaneId,
 	instance: ChainId,
 	source_to_target_headers_relay: Option<OnDemandHeadersRelay<P::SourceChain>>,
-	_phantom: PhantomData<(R, I)>,
+	_phantom: PhantomData<I>,
 }
 
-impl<C: Chain, P: SubstrateMessageLane, R, I> SubstrateMessagesTarget<C, P, R, I> {
+impl<C: Chain, P: SubstrateMessageLane, I> SubstrateMessagesTarget<C, P, I> {
 	/// Create new Substrate headers target.
 	pub fn new(
 		client: Client<C>,
@@ -75,7 +74,7 @@ impl<C: Chain, P: SubstrateMessageLane, R, I> SubstrateMessagesTarget<C, P, R, I
 	}
 }
 
-impl<C: Chain, P: SubstrateMessageLane, R, I> Clone for SubstrateMessagesTarget<C, P, R, I> {
+impl<C: Chain, P: SubstrateMessageLane, I> Clone for SubstrateMessagesTarget<C, P, I> {
 	fn clone(&self) -> Self {
 		Self {
 			client: self.client.clone(),
@@ -89,11 +88,10 @@ impl<C: Chain, P: SubstrateMessageLane, R, I> Clone for SubstrateMessagesTarget<
 }
 
 #[async_trait]
-impl<C, P, R, I> RelayClient for SubstrateMessagesTarget<C, P, R, I>
+impl<C, P, I> RelayClient for SubstrateMessagesTarget<C, P, I>
 where
 	C: Chain,
 	P: SubstrateMessageLane,
-	R: 'static + Send + Sync,
 	I: Send + Sync + Instance,
 {
 	type Error = SubstrateError;
@@ -104,7 +102,7 @@ where
 }
 
 #[async_trait]
-impl<C, P, R, I> TargetClient<P> for SubstrateMessagesTarget<C, P, R, I>
+impl<C, P, I> TargetClient<P> for SubstrateMessagesTarget<C, P, I>
 where
 	C: Chain,
 	C::Header: DeserializeOwned,
@@ -119,7 +117,6 @@ where
 	P::SourceChain: Chain<Hash = P::SourceHeaderHash, BlockNumber = P::SourceHeaderNumber>,
 	P::SourceHeaderNumber: Decode,
 	P::SourceHeaderHash: Decode,
-	R: Send + Sync + MessagesConfig<I>,
 	I: Send + Sync + Instance,
 {
 	async fn state(&self) -> Result<TargetClientState<P>, SubstrateError> {
@@ -190,7 +187,7 @@ where
 		id: TargetHeaderIdOf<P>,
 	) -> Result<(TargetHeaderIdOf<P>, P::MessagesReceivingProof), SubstrateError> {
 		let (id, relayers_state) = self.unrewarded_relayers_state(id).await?;
-		let inbound_data_key = pallet_bridge_messages::storage_keys::inbound_lane_data_key::<R, I>(&self.lane_id);
+		let inbound_data_key = pallet_bridge_messages::storage_keys::inbound_lane_data_key::<I>(&self.lane_id);
 		let proof = self
 			.client
 			.prove_storage(vec![inbound_data_key], id.1)

bridges/relays/client-rococo/Cargo.toml

@@ -12,7 +12,16 @@ relay-substrate-client = { path = "../client-substrate" }
 relay-utils = { path = "../utils" }
 
 # Bridge dependencies
+bridge-runtime-common = { path = "../../bin/runtime-common" }
+bp-header-chain = { path = "../../primitives/header-chain" }
+bp-message-dispatch = { path = "../../primitives/message-dispatch" }
+bp-messages = { path = "../../primitives/messages" }
+bp-polkadot-core = { path = "../../primitives/polkadot-core" }
 bp-rococo = { path = "../../primitives/chain-rococo" }
+bp-runtime = { path = "../../primitives/runtime" }
+bp-wococo = { path = "../../primitives/chain-wococo" }
+pallet-bridge-dispatch = { path = "../../modules/dispatch" }
+pallet-bridge-messages = { path = "../../modules/messages" }
 
 # Substrate Dependencies
 frame-system = { git = "https://github.com/paritytech/substrate", branch = "master" }

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

@@ -22,6 +22,8 @@ use sp_core::{storage::StorageKey, Pair};
 use sp_runtime::{generic::SignedPayload, traits::IdentifyAccount};
 use std::time::Duration;
 
+pub mod runtime;
+
 /// Rococo header id.
 pub type HeaderId = relay_utils::HeaderId<bp_rococo::Hash, bp_rococo::BlockNumber>;
 
@@ -46,7 +48,7 @@ impl Chain for Rococo {
 	type AccountId = bp_rococo::AccountId;
 	type Index = bp_rococo::Index;
 	type SignedBlock = bp_rococo::SignedBlock;
-	type Call = bp_rococo::Call;
+	type Call = crate::runtime::Call;
 	type Balance = bp_rococo::Balance;
 }
 
@@ -59,7 +61,7 @@ impl ChainWithBalances for Rococo {
 impl TransactionSignScheme for Rococo {
 	type Chain = Rococo;
 	type AccountKeyPair = sp_core::sr25519::Pair;
-	type SignedTransaction = bp_rococo::UncheckedExtrinsic;
+	type SignedTransaction = crate::runtime::UncheckedExtrinsic;
 
 	fn sign_transaction(
 		genesis_hash: <Self::Chain as ChainBase>::Hash,

bridges/relays/client-rococo/src/runtime.rs

@@ -0,0 +1,135 @@
+// 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/>.
+
+//! Types that are specific to the Rococo runtime.
+
+use bp_messages::{LaneId, UnrewardedRelayersState};
+use bp_polkadot_core::PolkadotLike;
+use bp_runtime::Chain;
+use codec::{Decode, Encode};
+use frame_support::weights::Weight;
+
+/// Instance of messages pallet that is used to bridge with Wococo chain.
+pub type WithWococoMessagesInstance = pallet_bridge_messages::Instance1;
+
+/// Unchecked Rococo extrinsic.
+pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
+
+/// Wococo account ownership digest from Rococo.
+///
+/// The byte vector returned by this function should be signed with a Wococo account private key.
+/// This way, the owner of `rococo_account_id` on Rococo proves that the Wococo account private key
+/// is also under his control.
+pub fn rococo_to_wococo_account_ownership_digest<Call, AccountId, SpecVersion>(
+	wococo_call: &Call,
+	rococo_account_id: AccountId,
+	wococo_spec_version: SpecVersion,
+) -> Vec<u8>
+where
+	Call: codec::Encode,
+	AccountId: codec::Encode,
+	SpecVersion: codec::Encode,
+{
+	pallet_bridge_dispatch::account_ownership_digest(
+		wococo_call,
+		rococo_account_id,
+		wococo_spec_version,
+		bp_runtime::ROCOCO_CHAIN_ID,
+		bp_runtime::WOCOCO_CHAIN_ID,
+	)
+}
+
+/// Rococo Runtime `Call` enum.
+///
+/// The enum represents a subset of possible `Call`s we can send to Rococo chain.
+/// Ideally this code would be auto-generated from Metadata, because we want to
+/// avoid depending directly on the ENTIRE runtime just to get the encoding of `Dispatchable`s.
+///
+/// All entries here (like pretty much in the entire file) must be kept in sync with Rococo
+/// `construct_runtime`, so that we maintain SCALE-compatibility.
+///
+/// See: https://github.com/paritytech/polkadot/blob/master/runtime/rococo/src/lib.rs
+#[allow(clippy::large_enum_variant)]
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+pub enum Call {
+	/// System pallet.
+	#[codec(index = 0)]
+	System(SystemCall),
+	/// Wococo bridge pallet.
+	#[codec(index = 41)]
+	BridgeGrandpaWococo(BridgeGrandpaWococoCall),
+	/// Wococo messages pallet.
+	#[codec(index = 44)]
+	BridgeMessagesWococo(BridgeMessagesWococoCall),
+}
+
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+#[allow(non_camel_case_types)]
+pub enum SystemCall {
+	#[codec(index = 1)]
+	remark(Vec<u8>),
+}
+
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+#[allow(non_camel_case_types)]
+pub enum BridgeGrandpaWococoCall {
+	#[codec(index = 0)]
+	submit_finality_proof(
+		<PolkadotLike as Chain>::Header,
+		bp_header_chain::justification::GrandpaJustification<<PolkadotLike as Chain>::Header>,
+	),
+	#[codec(index = 1)]
+	initialize(bp_header_chain::InitializationData<<PolkadotLike as Chain>::Header>),
+}
+
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+#[allow(non_camel_case_types)]
+pub enum BridgeMessagesWococoCall {
+	#[codec(index = 3)]
+	send_message(
+		LaneId,
+		bp_message_dispatch::MessagePayload<
+			bp_rococo::AccountId,
+			bp_wococo::AccountId,
+			bp_wococo::AccountPublic,
+			Vec<u8>,
+		>,
+		bp_rococo::Balance,
+	),
+	#[codec(index = 5)]
+	receive_messages_proof(
+		bp_wococo::AccountId,
+		bridge_runtime_common::messages::target::FromBridgedChainMessagesProof<bp_wococo::Hash>,
+		u32,
+		Weight,
+	),
+	#[codec(index = 6)]
+	receive_messages_delivery_proof(
+		bridge_runtime_common::messages::source::FromBridgedChainMessagesDeliveryProof<bp_wococo::Hash>,
+		UnrewardedRelayersState,
+	),
+}
+
+impl sp_runtime::traits::Dispatchable for Call {
+	type Origin = ();
+	type Config = ();
+	type Info = ();
+	type PostInfo = ();
+
+	fn dispatch(self, _origin: Self::Origin) -> sp_runtime::DispatchResultWithInfo<Self::PostInfo> {
+		unimplemented!("The Call is not expected to be dispatched.")
+	}
+}

bridges/relays/client-wococo/Cargo.toml

@@ -12,7 +12,16 @@ relay-substrate-client = { path = "../client-substrate" }
 relay-utils = { path = "../utils" }
 
 # Bridge dependencies
+bridge-runtime-common = { path = "../../bin/runtime-common" }
+bp-header-chain = { path = "../../primitives/header-chain" }
+bp-message-dispatch = { path = "../../primitives/message-dispatch" }
+bp-messages = { path = "../../primitives/messages" }
+bp-polkadot-core = { path = "../../primitives/polkadot-core" }
+bp-rococo = { path = "../../primitives/chain-rococo" }
+bp-runtime = { path = "../../primitives/runtime" }
 bp-wococo = { path = "../../primitives/chain-wococo" }
+pallet-bridge-dispatch = { path = "../../modules/dispatch" }
+pallet-bridge-messages = { path = "../../modules/messages" }
 
 # Substrate Dependencies
 frame-system = { git = "https://github.com/paritytech/substrate", branch = "master" }

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

@@ -22,6 +22,8 @@ use sp_core::{storage::StorageKey, Pair};
 use sp_runtime::{generic::SignedPayload, traits::IdentifyAccount};
 use std::time::Duration;
 
+pub mod runtime;
+
 /// Wococo header id.
 pub type HeaderId = relay_utils::HeaderId<bp_wococo::Hash, bp_wococo::BlockNumber>;
 
@@ -46,7 +48,7 @@ impl Chain for Wococo {
 	type AccountId = bp_wococo::AccountId;
 	type Index = bp_wococo::Index;
 	type SignedBlock = bp_wococo::SignedBlock;
-	type Call = bp_wococo::Call;
+	type Call = crate::runtime::Call;
 	type Balance = bp_wococo::Balance;
 }
 
@@ -59,7 +61,7 @@ impl ChainWithBalances for Wococo {
 impl TransactionSignScheme for Wococo {
 	type Chain = Wococo;
 	type AccountKeyPair = sp_core::sr25519::Pair;
-	type SignedTransaction = bp_wococo::UncheckedExtrinsic;
+	type SignedTransaction = crate::runtime::UncheckedExtrinsic;
 
 	fn sign_transaction(
 		genesis_hash: <Self::Chain as ChainBase>::Hash,

bridges/relays/client-wococo/src/runtime.rs

@@ -0,0 +1,135 @@
+// 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/>.
+
+//! Types that are specific to the Wococo runtime.
+
+use bp_messages::{LaneId, UnrewardedRelayersState};
+use bp_polkadot_core::PolkadotLike;
+use bp_runtime::Chain;
+use codec::{Decode, Encode};
+use frame_support::weights::Weight;
+
+/// Instance of messages pallet that is used to bridge with Rococo chain.
+pub type WithRococoMessagesInstance = pallet_bridge_messages::DefaultInstance;
+
+/// Unchecked Wococo extrinsic.
+pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
+
+/// Rococo account ownership digest from Wococo.
+///
+/// The byte vector returned by this function should be signed with a Rococo account private key.
+/// This way, the owner of `wococo_account_id` on Rococo proves that the Rococo account private key
+/// is also under his control.
+pub fn wococo_to_rococo_account_ownership_digest<Call, AccountId, SpecVersion>(
+	rococo_call: &Call,
+	wococo_account_id: AccountId,
+	rococo_spec_version: SpecVersion,
+) -> Vec<u8>
+where
+	Call: codec::Encode,
+	AccountId: codec::Encode,
+	SpecVersion: codec::Encode,
+{
+	pallet_bridge_dispatch::account_ownership_digest(
+		rococo_call,
+		wococo_account_id,
+		rococo_spec_version,
+		bp_runtime::WOCOCO_CHAIN_ID,
+		bp_runtime::ROCOCO_CHAIN_ID,
+	)
+}
+
+/// Wococo Runtime `Call` enum.
+///
+/// The enum represents a subset of possible `Call`s we can send to Rococo chain.
+/// Ideally this code would be auto-generated from Metadata, because we want to
+/// avoid depending directly on the ENTIRE runtime just to get the encoding of `Dispatchable`s.
+///
+/// All entries here (like pretty much in the entire file) must be kept in sync with Rococo
+/// `construct_runtime`, so that we maintain SCALE-compatibility.
+///
+/// See: https://github.com/paritytech/polkadot/blob/master/runtime/rococo/src/lib.rs
+#[allow(clippy::large_enum_variant)]
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+pub enum Call {
+	/// System pallet.
+	#[codec(index = 0)]
+	System(SystemCall),
+	/// Rococo bridge pallet.
+	#[codec(index = 40)]
+	BridgeGrandpaRococo(BridgeGrandpaRococoCall),
+	/// Rococo messages pallet.
+	#[codec(index = 43)]
+	BridgeMessagesRococo(BridgeMessagesRococoCall),
+}
+
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+#[allow(non_camel_case_types)]
+pub enum SystemCall {
+	#[codec(index = 1)]
+	remark(Vec<u8>),
+}
+
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+#[allow(non_camel_case_types)]
+pub enum BridgeGrandpaRococoCall {
+	#[codec(index = 0)]
+	submit_finality_proof(
+		<PolkadotLike as Chain>::Header,
+		bp_header_chain::justification::GrandpaJustification<<PolkadotLike as Chain>::Header>,
+	),
+	#[codec(index = 1)]
+	initialize(bp_header_chain::InitializationData<<PolkadotLike as Chain>::Header>),
+}
+
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone)]
+#[allow(non_camel_case_types)]
+pub enum BridgeMessagesRococoCall {
+	#[codec(index = 3)]
+	send_message(
+		LaneId,
+		bp_message_dispatch::MessagePayload<
+			bp_rococo::AccountId,
+			bp_wococo::AccountId,
+			bp_wococo::AccountPublic,
+			Vec<u8>,
+		>,
+		bp_rococo::Balance,
+	),
+	#[codec(index = 5)]
+	receive_messages_proof(
+		bp_rococo::AccountId,
+		bridge_runtime_common::messages::target::FromBridgedChainMessagesProof<bp_rococo::Hash>,
+		u32,
+		Weight,
+	),
+	#[codec(index = 6)]
+	receive_messages_delivery_proof(
+		bridge_runtime_common::messages::source::FromBridgedChainMessagesDeliveryProof<bp_rococo::Hash>,
+		UnrewardedRelayersState,
+	),
+}
+
+impl sp_runtime::traits::Dispatchable for Call {
+	type Origin = ();
+	type Config = ();
+	type Info = ();
+	type PostInfo = ();
+
+	fn dispatch(self, _origin: Self::Origin) -> sp_runtime::DispatchResultWithInfo<Self::PostInfo> {
+		unimplemented!("The Call is not expected to be dispatched.")
+	}
+}