Removes Snowbridge parachain directory (#3186)

Removes the `bridges/snowbridge/parachain` directory and moves
everything up to under `snowbridge` directly. We are cleaning up our
local dev env after merging our crates into the polkadot-sdk.

---------

Co-authored-by: claravanstaden <Cats 4 life!>

bridges/snowbridge/pallets/inbound-queue/src/benchmarking/mod.rs

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use super::*;
+
+use crate::Pallet as InboundQueue;
+use frame_benchmarking::v2::*;
+use frame_support::assert_ok;
+use frame_system::RawOrigin;
+use snowbridge_pallet_inbound_queue_fixtures::register_token::make_register_token_message;
+
+#[benchmarks]
+mod benchmarks {
+	use super::*;
+
+	#[benchmark]
+	fn submit() -> Result<(), BenchmarkError> {
+		let caller: T::AccountId = whitelisted_caller();
+
+		let create_message = make_register_token_message();
+
+		T::Helper::initialize_storage(
+			create_message.message.proof.block_hash,
+			create_message.execution_header,
+		);
+
+		let sovereign_account = sibling_sovereign_account::<T>(1000u32.into());
+
+		let minimum_balance = T::Token::minimum_balance();
+
+		// So that the receiving account exists
+		assert_ok!(T::Token::mint_into(&caller, minimum_balance));
+		// Fund the sovereign account (parachain sovereign account) so it can transfer a reward
+		// fee to the caller account
+		assert_ok!(T::Token::mint_into(
+			&sovereign_account,
+			3_000_000_000_000u128
+				.try_into()
+				.unwrap_or_else(|_| panic!("unable to cast sovereign account balance")),
+		));
+
+		#[block]
+		{
+			assert_ok!(InboundQueue::<T>::submit(
+				RawOrigin::Signed(caller.clone()).into(),
+				create_message.message,
+			));
+		}
+
+		Ok(())
+	}
+
+	impl_benchmark_test_suite!(InboundQueue, crate::mock::new_tester(), crate::mock::Test);
+}

bridges/snowbridge/pallets/inbound-queue/src/envelope.rs

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use snowbridge_core::{inbound::Log, ChannelId};
+
+use sp_core::{RuntimeDebug, H160, H256};
+use sp_std::{convert::TryFrom, prelude::*};
+
+use alloy_primitives::B256;
+use alloy_sol_types::{sol, SolEvent};
+
+sol! {
+	event OutboundMessageAccepted(bytes32 indexed channel_id, uint64 nonce, bytes32 indexed message_id, bytes payload);
+}
+
+/// An inbound message that has had its outer envelope decoded.
+#[derive(Clone, RuntimeDebug)]
+pub struct Envelope {
+	/// The address of the outbound queue on Ethereum that emitted this message as an event log
+	pub gateway: H160,
+	/// The message Channel
+	pub channel_id: ChannelId,
+	/// A nonce for enforcing replay protection and ordering.
+	pub nonce: u64,
+	/// An id for tracing the message on its route (has no role in bridge consensus)
+	pub message_id: H256,
+	/// The inner payload generated from the source application.
+	pub payload: Vec<u8>,
+}
+
+#[derive(Copy, Clone, RuntimeDebug)]
+pub struct EnvelopeDecodeError;
+
+impl TryFrom<&Log> for Envelope {
+	type Error = EnvelopeDecodeError;
+
+	fn try_from(log: &Log) -> Result<Self, Self::Error> {
+		let topics: Vec<B256> = log.topics.iter().map(|x| B256::from_slice(x.as_ref())).collect();
+
+		let event = OutboundMessageAccepted::decode_log(topics, &log.data, true)
+			.map_err(|_| EnvelopeDecodeError)?;
+
+		Ok(Self {
+			gateway: log.address,
+			channel_id: ChannelId::from(event.channel_id.as_ref()),
+			nonce: event.nonce,
+			message_id: H256::from(event.message_id.as_ref()),
+			payload: event.payload,
+		})
+	}
+}

bridges/snowbridge/pallets/inbound-queue/src/lib.rs

@@ -0,0 +1,372 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+//! Inbound Queue
+//!
+//! # Overview
+//!
+//! Receives messages emitted by the Gateway contract on Ethereum, whereupon they are verified,
+//! translated to XCM, and finally sent to their final destination parachain.
+//!
+//! The message relayers are rewarded using native currency from the sovereign account of the
+//! destination parachain.
+//!
+//! # Extrinsics
+//!
+//! ## Governance
+//!
+//! * [`Call::set_operating_mode`]: Set the operating mode of the pallet. Can be used to disable
+//!   processing of inbound messages.
+//!
+//! ## Message Submission
+//!
+//! * [`Call::submit`]: Submit a message for verification and dispatch the final destination
+//!   parachain.
+#![cfg_attr(not(feature = "std"), no_std)]
+
+mod envelope;
+
+#[cfg(feature = "runtime-benchmarks")]
+mod benchmarking;
+
+#[cfg(feature = "runtime-benchmarks")]
+use snowbridge_beacon_primitives::CompactExecutionHeader;
+
+pub mod weights;
+
+#[cfg(test)]
+mod mock;
+
+#[cfg(test)]
+mod test;
+
+use codec::{Decode, DecodeAll, Encode};
+use envelope::Envelope;
+use frame_support::{
+	traits::{
+		fungible::{Inspect, Mutate},
+		tokens::Preservation,
+	},
+	weights::WeightToFee,
+	PalletError,
+};
+use frame_system::ensure_signed;
+use scale_info::TypeInfo;
+use sp_core::{H160, H256};
+use sp_std::{convert::TryFrom, vec};
+use xcm::prelude::{
+	send_xcm, Instruction::SetTopic, Junction::*, Location, SendError as XcmpSendError, SendXcm,
+	Xcm, XcmContext, XcmHash,
+};
+use xcm_executor::traits::TransactAsset;
+
+use snowbridge_core::{
+	inbound::{Message, VerificationError, Verifier},
+	sibling_sovereign_account, BasicOperatingMode, Channel, ChannelId, ParaId, PricingParameters,
+	StaticLookup,
+};
+use snowbridge_router_primitives::{
+	inbound,
+	inbound::{ConvertMessage, ConvertMessageError},
+};
+use sp_runtime::{traits::Saturating, SaturatedConversion, TokenError};
+
+pub use weights::WeightInfo;
+
+type BalanceOf<T> =
+	<<T as pallet::Config>::Token as Inspect<<T as frame_system::Config>::AccountId>>::Balance;
+
+pub use pallet::*;
+
+pub const LOG_TARGET: &str = "snowbridge-inbound-queue";
+
+#[frame_support::pallet]
+pub mod pallet {
+	use super::*;
+
+	use frame_support::pallet_prelude::*;
+	use frame_system::pallet_prelude::*;
+
+	#[pallet::pallet]
+	pub struct Pallet<T>(_);
+
+	#[cfg(feature = "runtime-benchmarks")]
+	pub trait BenchmarkHelper<T> {
+		fn initialize_storage(block_hash: H256, header: CompactExecutionHeader);
+	}
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config {
+		type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
+
+		/// The verifier for inbound messages from Ethereum
+		type Verifier: Verifier;
+
+		/// Message relayers are rewarded with this asset
+		type Token: Mutate<Self::AccountId> + Inspect<Self::AccountId>;
+
+		/// XCM message sender
+		type XcmSender: SendXcm;
+
+		// Address of the Gateway contract
+		#[pallet::constant]
+		type GatewayAddress: Get<H160>;
+
+		/// Convert inbound message to XCM
+		type MessageConverter: ConvertMessage<
+			AccountId = Self::AccountId,
+			Balance = BalanceOf<Self>,
+		>;
+
+		/// Lookup a channel descriptor
+		type ChannelLookup: StaticLookup<Source = ChannelId, Target = Channel>;
+
+		/// Lookup pricing parameters
+		type PricingParameters: Get<PricingParameters<BalanceOf<Self>>>;
+
+		type WeightInfo: WeightInfo;
+
+		#[cfg(feature = "runtime-benchmarks")]
+		type Helper: BenchmarkHelper<Self>;
+
+		/// Convert a weight value into deductible balance type.
+		type WeightToFee: WeightToFee<Balance = BalanceOf<Self>>;
+
+		/// Convert a length value into deductible balance type
+		type LengthToFee: WeightToFee<Balance = BalanceOf<Self>>;
+
+		/// The upper limit here only used to estimate delivery cost
+		type MaxMessageSize: Get<u32>;
+
+		/// To withdraw and deposit an asset.
+		type AssetTransactor: TransactAsset;
+	}
+
+	#[pallet::hooks]
+	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
+
+	#[pallet::event]
+	#[pallet::generate_deposit(pub(super) fn deposit_event)]
+	pub enum Event<T: Config> {
+		/// A message was received from Ethereum
+		MessageReceived {
+			/// The message channel
+			channel_id: ChannelId,
+			/// The message nonce
+			nonce: u64,
+			/// ID of the XCM message which was forwarded to the final destination parachain
+			message_id: [u8; 32],
+			/// Fee burned for the teleport
+			fee_burned: BalanceOf<T>,
+		},
+		/// Set OperatingMode
+		OperatingModeChanged { mode: BasicOperatingMode },
+	}
+
+	#[pallet::error]
+	pub enum Error<T> {
+		/// Message came from an invalid outbound channel on the Ethereum side.
+		InvalidGateway,
+		/// Message has an invalid envelope.
+		InvalidEnvelope,
+		/// Message has an unexpected nonce.
+		InvalidNonce,
+		/// Message has an invalid payload.
+		InvalidPayload,
+		/// Message channel is invalid
+		InvalidChannel,
+		/// The max nonce for the type has been reached
+		MaxNonceReached,
+		/// Cannot convert location
+		InvalidAccountConversion,
+		/// Pallet is halted
+		Halted,
+		/// Message verification error,
+		Verification(VerificationError),
+		/// XCMP send failure
+		Send(SendError),
+		/// Message conversion error
+		ConvertMessage(ConvertMessageError),
+	}
+
+	#[derive(Clone, Encode, Decode, Eq, PartialEq, Debug, TypeInfo, PalletError)]
+	pub enum SendError {
+		NotApplicable,
+		NotRoutable,
+		Transport,
+		DestinationUnsupported,
+		ExceedsMaxMessageSize,
+		MissingArgument,
+		Fees,
+	}
+
+	impl<T: Config> From<XcmpSendError> for Error<T> {
+		fn from(e: XcmpSendError) -> Self {
+			match e {
+				XcmpSendError::NotApplicable => Error::<T>::Send(SendError::NotApplicable),
+				XcmpSendError::Unroutable => Error::<T>::Send(SendError::NotRoutable),
+				XcmpSendError::Transport(_) => Error::<T>::Send(SendError::Transport),
+				XcmpSendError::DestinationUnsupported =>
+					Error::<T>::Send(SendError::DestinationUnsupported),
+				XcmpSendError::ExceedsMaxMessageSize =>
+					Error::<T>::Send(SendError::ExceedsMaxMessageSize),
+				XcmpSendError::MissingArgument => Error::<T>::Send(SendError::MissingArgument),
+				XcmpSendError::Fees => Error::<T>::Send(SendError::Fees),
+			}
+		}
+	}
+
+	/// The current nonce for each channel
+	#[pallet::storage]
+	pub type Nonce<T: Config> = StorageMap<_, Twox64Concat, ChannelId, u64, ValueQuery>;
+
+	/// The current operating mode of the pallet.
+	#[pallet::storage]
+	#[pallet::getter(fn operating_mode)]
+	pub type OperatingMode<T: Config> = StorageValue<_, BasicOperatingMode, ValueQuery>;
+
+	#[pallet::call]
+	impl<T: Config> Pallet<T> {
+		/// Submit an inbound message originating from the Gateway contract on Ethereum
+		#[pallet::call_index(0)]
+		#[pallet::weight(T::WeightInfo::submit())]
+		pub fn submit(origin: OriginFor<T>, message: Message) -> DispatchResult {
+			let who = ensure_signed(origin)?;
+			ensure!(!Self::operating_mode().is_halted(), Error::<T>::Halted);
+
+			// submit message to verifier for verification
+			T::Verifier::verify(&message.event_log, &message.proof)
+				.map_err(|e| Error::<T>::Verification(e))?;
+
+			// Decode event log into an Envelope
+			let envelope =
+				Envelope::try_from(&message.event_log).map_err(|_| Error::<T>::InvalidEnvelope)?;
+
+			// Verify that the message was submitted from the known Gateway contract
+			ensure!(T::GatewayAddress::get() == envelope.gateway, Error::<T>::InvalidGateway);
+
+			// Retrieve the registered channel for this message
+			let channel =
+				T::ChannelLookup::lookup(envelope.channel_id).ok_or(Error::<T>::InvalidChannel)?;
+
+			// Verify message nonce
+			<Nonce<T>>::try_mutate(envelope.channel_id, |nonce| -> DispatchResult {
+				if *nonce == u64::MAX {
+					return Err(Error::<T>::MaxNonceReached.into())
+				}
+				if envelope.nonce != nonce.saturating_add(1) {
+					Err(Error::<T>::InvalidNonce.into())
+				} else {
+					*nonce = nonce.saturating_add(1);
+					Ok(())
+				}
+			})?;
+
+			// Reward relayer from the sovereign account of the destination parachain
+			// Expected to fail if sovereign account has no funds
+			let sovereign_account = sibling_sovereign_account::<T>(channel.para_id);
+			let delivery_cost = Self::calculate_delivery_cost(message.encode().len() as u32);
+			T::Token::transfer(&sovereign_account, &who, delivery_cost, Preservation::Preserve)?;
+
+			// Decode message into XCM
+			let (xcm, fee) =
+				match inbound::VersionedMessage::decode_all(&mut envelope.payload.as_ref()) {
+					Ok(message) => Self::do_convert(envelope.message_id, message)?,
+					Err(_) => return Err(Error::<T>::InvalidPayload.into()),
+				};
+
+			log::info!(
+				target: LOG_TARGET,
+				"💫 xcm decoded as {:?} with fee {:?}",
+				xcm,
+				fee
+			);
+
+			// Burning fees for teleport
+			Self::burn_fees(channel.para_id, fee)?;
+
+			// Attempt to send XCM to a dest parachain
+			let message_id = Self::send_xcm(xcm, channel.para_id)?;
+
+			Self::deposit_event(Event::MessageReceived {
+				channel_id: envelope.channel_id,
+				nonce: envelope.nonce,
+				message_id,
+				fee_burned: fee,
+			});
+
+			Ok(())
+		}
+
+		/// Halt or resume all pallet operations. May only be called by root.
+		#[pallet::call_index(1)]
+		#[pallet::weight((T::DbWeight::get().reads_writes(1, 1), DispatchClass::Operational))]
+		pub fn set_operating_mode(
+			origin: OriginFor<T>,
+			mode: BasicOperatingMode,
+		) -> DispatchResult {
+			ensure_root(origin)?;
+			OperatingMode::<T>::set(mode);
+			Self::deposit_event(Event::OperatingModeChanged { mode });
+			Ok(())
+		}
+	}
+
+	impl<T: Config> Pallet<T> {
+		pub fn do_convert(
+			message_id: H256,
+			message: inbound::VersionedMessage,
+		) -> Result<(Xcm<()>, BalanceOf<T>), Error<T>> {
+			let (mut xcm, fee) =
+				T::MessageConverter::convert(message).map_err(|e| Error::<T>::ConvertMessage(e))?;
+			// Append the message id as an XCM topic
+			xcm.inner_mut().extend(vec![SetTopic(message_id.into())]);
+			Ok((xcm, fee))
+		}
+
+		pub fn send_xcm(xcm: Xcm<()>, dest: ParaId) -> Result<XcmHash, Error<T>> {
+			let dest = Location::new(1, [Parachain(dest.into())]);
+			let (xcm_hash, _) = send_xcm::<T::XcmSender>(dest, xcm).map_err(Error::<T>::from)?;
+			Ok(xcm_hash)
+		}
+
+		pub fn calculate_delivery_cost(length: u32) -> BalanceOf<T> {
+			let weight_fee = T::WeightToFee::weight_to_fee(&T::WeightInfo::submit());
+			let len_fee = T::LengthToFee::weight_to_fee(&Weight::from_parts(length as u64, 0));
+			weight_fee
+				.saturating_add(len_fee)
+				.saturating_add(T::PricingParameters::get().rewards.local)
+		}
+
+		/// Burn the amount of the fee embedded into the XCM for teleports
+		pub fn burn_fees(para_id: ParaId, fee: BalanceOf<T>) -> DispatchResult {
+			let dummy_context =
+				XcmContext { origin: None, message_id: Default::default(), topic: None };
+			let dest = Location::new(1, [Parachain(para_id.into())]);
+			let fees = (Location::parent(), fee.saturated_into::<u128>()).into();
+			T::AssetTransactor::can_check_out(&dest, &fees, &dummy_context).map_err(|error| {
+				log::error!(
+					target: LOG_TARGET,
+					"XCM asset check out failed with error {:?}", error
+				);
+				TokenError::FundsUnavailable
+			})?;
+			T::AssetTransactor::check_out(&dest, &fees, &dummy_context);
+			T::AssetTransactor::withdraw_asset(&fees, &dest, None).map_err(|error| {
+				log::error!(
+					target: LOG_TARGET,
+					"XCM asset withdraw failed with error {:?}", error
+				);
+				TokenError::FundsUnavailable
+			})?;
+			Ok(())
+		}
+	}
+
+	/// API for accessing the delivery cost of a message
+	impl<T: Config> Get<BalanceOf<T>> for Pallet<T> {
+		fn get() -> BalanceOf<T> {
+			// Cost here based on MaxMessagePayloadSize(the worst case)
+			Self::calculate_delivery_cost(T::MaxMessageSize::get())
+		}
+	}
+}

bridges/snowbridge/pallets/inbound-queue/src/mock.rs

@@ -0,0 +1,347 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use super::*;
+
+use frame_support::{
+	parameter_types,
+	traits::{ConstU128, ConstU32, Everything},
+	weights::IdentityFee,
+};
+use hex_literal::hex;
+use snowbridge_beacon_primitives::{Fork, ForkVersions};
+use snowbridge_core::{
+	gwei,
+	inbound::{Log, Proof, VerificationError},
+	meth, Channel, ChannelId, PricingParameters, Rewards, StaticLookup,
+};
+use snowbridge_router_primitives::inbound::MessageToXcm;
+use sp_core::{H160, H256};
+use sp_runtime::{
+	traits::{BlakeTwo256, IdentifyAccount, IdentityLookup, Verify},
+	BuildStorage, FixedU128, MultiSignature,
+};
+use sp_std::convert::From;
+use xcm::{latest::SendXcm, prelude::*};
+use xcm_executor::AssetsInHolding;
+
+use crate::{self as inbound_queue};
+
+type Block = frame_system::mocking::MockBlock<Test>;
+
+frame_support::construct_runtime!(
+	pub enum Test
+	{
+		System: frame_system::{Pallet, Call, Storage, Event<T>},
+		Balances: pallet_balances::{Pallet, Call, Storage, Config<T>, Event<T>},
+		EthereumBeaconClient: snowbridge_pallet_ethereum_client::{Pallet, Call, Storage, Event<T>},
+		InboundQueue: inbound_queue::{Pallet, Call, Storage, Event<T>},
+	}
+);
+
+pub type Signature = MultiSignature;
+pub type AccountId = <<Signature as Verify>::Signer as IdentifyAccount>::AccountId;
+
+parameter_types! {
+	pub const BlockHashCount: u64 = 250;
+}
+
+type Balance = u128;
+
+impl frame_system::Config for Test {
+	type BaseCallFilter = Everything;
+	type BlockWeights = ();
+	type BlockLength = ();
+	type RuntimeOrigin = RuntimeOrigin;
+	type RuntimeCall = RuntimeCall;
+	type RuntimeTask = RuntimeTask;
+	type Hash = H256;
+	type Hashing = BlakeTwo256;
+	type AccountId = AccountId;
+	type Lookup = IdentityLookup<Self::AccountId>;
+	type RuntimeEvent = RuntimeEvent;
+	type BlockHashCount = BlockHashCount;
+	type DbWeight = ();
+	type Version = ();
+	type PalletInfo = PalletInfo;
+	type AccountData = pallet_balances::AccountData<u128>;
+	type OnNewAccount = ();
+	type OnKilledAccount = ();
+	type SystemWeightInfo = ();
+	type SS58Prefix = ();
+	type OnSetCode = ();
+	type MaxConsumers = frame_support::traits::ConstU32<16>;
+	type Nonce = u64;
+	type Block = Block;
+}
+
+impl pallet_balances::Config for Test {
+	type MaxLocks = ();
+	type MaxReserves = ();
+	type ReserveIdentifier = [u8; 8];
+	type Balance = Balance;
+	type RuntimeEvent = RuntimeEvent;
+	type DustRemoval = ();
+	type ExistentialDeposit = ConstU128<1>;
+	type AccountStore = System;
+	type WeightInfo = ();
+	type FreezeIdentifier = ();
+	type MaxFreezes = ();
+	type RuntimeHoldReason = ();
+	type RuntimeFreezeReason = ();
+}
+
+parameter_types! {
+	pub const ExecutionHeadersPruneThreshold: u32 = 10;
+	pub const ChainForkVersions: ForkVersions = ForkVersions{
+		genesis: Fork {
+			version: [0, 0, 0, 1], // 0x00000001
+			epoch: 0,
+		},
+		altair: Fork {
+			version: [1, 0, 0, 1], // 0x01000001
+			epoch: 0,
+		},
+		bellatrix: Fork {
+			version: [2, 0, 0, 1], // 0x02000001
+			epoch: 0,
+		},
+		capella: Fork {
+			version: [3, 0, 0, 1], // 0x03000001
+			epoch: 0,
+		},
+		deneb: Fork {
+			version: [4, 0, 0, 1], // 0x04000001
+			epoch: 4294967295,
+		}
+	};
+}
+
+impl snowbridge_pallet_ethereum_client::Config for Test {
+	type RuntimeEvent = RuntimeEvent;
+	type ForkVersions = ChainForkVersions;
+	type MaxExecutionHeadersToKeep = ExecutionHeadersPruneThreshold;
+	type WeightInfo = ();
+}
+
+// Mock verifier
+pub struct MockVerifier;
+
+impl Verifier for MockVerifier {
+	fn verify(_: &Log, _: &Proof) -> Result<(), VerificationError> {
+		Ok(())
+	}
+}
+
+const GATEWAY_ADDRESS: [u8; 20] = hex!["eda338e4dc46038493b885327842fd3e301cab39"];
+
+parameter_types! {
+	pub const EthereumNetwork: xcm::v3::NetworkId = xcm::v3::NetworkId::Ethereum { chain_id: 11155111 };
+	pub const GatewayAddress: H160 = H160(GATEWAY_ADDRESS);
+	pub const CreateAssetCall: [u8;2] = [53, 0];
+	pub const CreateAssetExecutionFee: u128 = 2_000_000_000;
+	pub const CreateAssetDeposit: u128 = 100_000_000_000;
+	pub const SendTokenExecutionFee: u128 = 1_000_000_000;
+	pub const InitialFund: u128 = 1_000_000_000_000;
+	pub const InboundQueuePalletInstance: u8 = 80;
+}
+
+#[cfg(feature = "runtime-benchmarks")]
+impl<T: snowbridge_pallet_ethereum_client::Config> BenchmarkHelper<T> for Test {
+	// not implemented since the MockVerifier is used for tests
+	fn initialize_storage(_: H256, _: CompactExecutionHeader) {}
+}
+
+// Mock XCM sender that always succeeds
+pub struct MockXcmSender;
+
+impl SendXcm for MockXcmSender {
+	type Ticket = Xcm<()>;
+
+	fn validate(
+		dest: &mut Option<Location>,
+		xcm: &mut Option<Xcm<()>>,
+	) -> SendResult<Self::Ticket> {
+		if let Some(location) = dest {
+			match location.unpack() {
+				(_, [Parachain(1001)]) => return Err(XcmpSendError::NotApplicable),
+				_ => Ok((xcm.clone().unwrap(), Assets::default())),
+			}
+		} else {
+			Ok((xcm.clone().unwrap(), Assets::default()))
+		}
+	}
+
+	fn deliver(xcm: Self::Ticket) -> core::result::Result<XcmHash, XcmpSendError> {
+		let hash = xcm.using_encoded(sp_io::hashing::blake2_256);
+		Ok(hash)
+	}
+}
+
+parameter_types! {
+	pub const OwnParaId: ParaId = ParaId::new(1013);
+	pub Parameters: PricingParameters<u128> = PricingParameters {
+		exchange_rate: FixedU128::from_rational(1, 400),
+		fee_per_gas: gwei(20),
+		rewards: Rewards { local: DOT, remote: meth(1) }
+	};
+}
+
+pub const DOT: u128 = 10_000_000_000;
+
+pub struct MockChannelLookup;
+impl StaticLookup for MockChannelLookup {
+	type Source = ChannelId;
+	type Target = Channel;
+
+	fn lookup(channel_id: Self::Source) -> Option<Self::Target> {
+		if channel_id !=
+			hex!("c173fac324158e77fb5840738a1a541f633cbec8884c6a601c567d2b376a0539").into()
+		{
+			return None
+		}
+		Some(Channel { agent_id: H256::zero(), para_id: ASSET_HUB_PARAID.into() })
+	}
+}
+
+pub struct SuccessfulTransactor;
+impl TransactAsset for SuccessfulTransactor {
+	fn can_check_in(_origin: &Location, _what: &Asset, _context: &XcmContext) -> XcmResult {
+		Ok(())
+	}
+
+	fn can_check_out(_dest: &Location, _what: &Asset, _context: &XcmContext) -> XcmResult {
+		Ok(())
+	}
+
+	fn deposit_asset(_what: &Asset, _who: &Location, _context: Option<&XcmContext>) -> XcmResult {
+		Ok(())
+	}
+
+	fn withdraw_asset(
+		_what: &Asset,
+		_who: &Location,
+		_context: Option<&XcmContext>,
+	) -> Result<AssetsInHolding, XcmError> {
+		Ok(AssetsInHolding::default())
+	}
+
+	fn internal_transfer_asset(
+		_what: &Asset,
+		_from: &Location,
+		_to: &Location,
+		_context: &XcmContext,
+	) -> Result<AssetsInHolding, XcmError> {
+		Ok(AssetsInHolding::default())
+	}
+}
+
+impl inbound_queue::Config for Test {
+	type RuntimeEvent = RuntimeEvent;
+	type Verifier = MockVerifier;
+	type Token = Balances;
+	type XcmSender = MockXcmSender;
+	type WeightInfo = ();
+	type GatewayAddress = GatewayAddress;
+	type MessageConverter = MessageToXcm<
+		CreateAssetCall,
+		CreateAssetDeposit,
+		InboundQueuePalletInstance,
+		AccountId,
+		Balance,
+	>;
+	type PricingParameters = Parameters;
+	type ChannelLookup = MockChannelLookup;
+	#[cfg(feature = "runtime-benchmarks")]
+	type Helper = Test;
+	type WeightToFee = IdentityFee<u128>;
+	type LengthToFee = IdentityFee<u128>;
+	type MaxMessageSize = ConstU32<1024>;
+	type AssetTransactor = SuccessfulTransactor;
+}
+
+pub fn last_events(n: usize) -> Vec<RuntimeEvent> {
+	frame_system::Pallet::<Test>::events()
+		.into_iter()
+		.rev()
+		.take(n)
+		.rev()
+		.map(|e| e.event)
+		.collect()
+}
+
+pub fn expect_events(e: Vec<RuntimeEvent>) {
+	assert_eq!(last_events(e.len()), e);
+}
+
+pub fn setup() {
+	System::set_block_number(1);
+	Balances::mint_into(
+		&sibling_sovereign_account::<Test>(ASSET_HUB_PARAID.into()),
+		InitialFund::get(),
+	)
+	.unwrap();
+	Balances::mint_into(
+		&sibling_sovereign_account::<Test>(TEMPLATE_PARAID.into()),
+		InitialFund::get(),
+	)
+	.unwrap();
+}
+
+pub fn new_tester() -> sp_io::TestExternalities {
+	let storage = frame_system::GenesisConfig::<Test>::default().build_storage().unwrap();
+	let mut ext: sp_io::TestExternalities = storage.into();
+	ext.execute_with(setup);
+	ext
+}
+
+// Generated from smoketests:
+//   cd smoketests
+//   ./make-bindings
+//   cargo test --test register_token -- --nocapture
+pub fn mock_event_log() -> Log {
+	Log {
+        // gateway address
+        address: hex!("eda338e4dc46038493b885327842fd3e301cab39").into(),
+        topics: vec![
+            hex!("7153f9357c8ea496bba60bf82e67143e27b64462b49041f8e689e1b05728f84f").into(),
+            // channel id
+            hex!("c173fac324158e77fb5840738a1a541f633cbec8884c6a601c567d2b376a0539").into(),
+            // message id
+            hex!("5f7060e971b0dc81e63f0aa41831091847d97c1a4693ac450cc128c7214e65e0").into(),
+        ],
+        // Nonce + Payload
+        data: hex!("00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002e000f000000000000000087d1f7fdfee7f651fabc8bfcb6e086c278b77a7d00e40b54020000000000000000000000000000000000000000000000000000000000").into(),
+    }
+}
+
+pub fn mock_event_log_invalid_channel() -> Log {
+	Log {
+        address: hex!("eda338e4dc46038493b885327842fd3e301cab39").into(),
+        topics: vec![
+            hex!("7153f9357c8ea496bba60bf82e67143e27b64462b49041f8e689e1b05728f84f").into(),
+            // invalid channel id
+            hex!("0000000000000000000000000000000000000000000000000000000000000000").into(),
+            hex!("5f7060e971b0dc81e63f0aa41831091847d97c1a4693ac450cc128c7214e65e0").into(),
+        ],
+        data: hex!("00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000001e000f000000000000000087d1f7fdfee7f651fabc8bfcb6e086c278b77a7d0000").into(),
+    }
+}
+
+pub fn mock_event_log_invalid_gateway() -> Log {
+	Log {
+        // gateway address
+        address: H160::zero(),
+        topics: vec![
+            hex!("7153f9357c8ea496bba60bf82e67143e27b64462b49041f8e689e1b05728f84f").into(),
+            // channel id
+            hex!("c173fac324158e77fb5840738a1a541f633cbec8884c6a601c567d2b376a0539").into(),
+            // message id
+            hex!("5f7060e971b0dc81e63f0aa41831091847d97c1a4693ac450cc128c7214e65e0").into(),
+        ],
+        // Nonce + Payload
+        data: hex!("00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000001e000f000000000000000087d1f7fdfee7f651fabc8bfcb6e086c278b77a7d0000").into(),
+    }
+}
+
+pub const ASSET_HUB_PARAID: u32 = 1000u32;
+pub const TEMPLATE_PARAID: u32 = 1001u32;

bridges/snowbridge/pallets/inbound-queue/src/test.rs

@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+use super::*;
+
+use frame_support::{assert_noop, assert_ok};
+use hex_literal::hex;
+use snowbridge_core::{inbound::Proof, ChannelId};
+use sp_keyring::AccountKeyring as Keyring;
+use sp_runtime::{DispatchError, TokenError};
+use sp_std::convert::From;
+
+use crate::{Error, Event as InboundQueueEvent};
+
+use crate::mock::*;
+
+#[test]
+fn test_submit_happy_path() {
+	new_tester().execute_with(|| {
+		let relayer: AccountId = Keyring::Bob.into();
+		let channel_sovereign = sibling_sovereign_account::<Test>(ASSET_HUB_PARAID.into());
+
+		let origin = RuntimeOrigin::signed(relayer.clone());
+
+		// Submit message
+		let message = Message {
+			event_log: mock_event_log(),
+			proof: Proof {
+				block_hash: Default::default(),
+				tx_index: Default::default(),
+				data: Default::default(),
+			},
+		};
+
+		let initial_fund = InitialFund::get();
+		assert_eq!(Balances::balance(&relayer), 0);
+		assert_eq!(Balances::balance(&channel_sovereign), initial_fund);
+
+		assert_ok!(InboundQueue::submit(origin.clone(), message.clone()));
+		expect_events(vec![InboundQueueEvent::MessageReceived {
+			channel_id: hex!("c173fac324158e77fb5840738a1a541f633cbec8884c6a601c567d2b376a0539")
+				.into(),
+			nonce: 1,
+			message_id: [
+				57, 61, 232, 3, 66, 61, 25, 190, 234, 188, 193, 174, 13, 186, 1, 64, 237, 94, 73,
+				83, 14, 18, 209, 213, 78, 121, 43, 108, 251, 245, 107, 67,
+			],
+			fee_burned: 110000000000,
+		}
+		.into()]);
+
+		let delivery_cost = InboundQueue::calculate_delivery_cost(message.encode().len() as u32);
+		assert!(
+			Parameters::get().rewards.local < delivery_cost,
+			"delivery cost exceeds pure reward"
+		);
+
+		assert_eq!(Balances::balance(&relayer), delivery_cost, "relayer was rewarded");
+		assert!(
+			Balances::balance(&channel_sovereign) <= initial_fund - delivery_cost,
+			"sovereign account paid reward"
+		);
+	});
+}
+
+#[test]
+fn test_submit_xcm_invalid_channel() {
+	new_tester().execute_with(|| {
+		let relayer: AccountId = Keyring::Bob.into();
+		let origin = RuntimeOrigin::signed(relayer);
+
+		// Deposit funds into sovereign account of parachain 1001
+		let sovereign_account = sibling_sovereign_account::<Test>(TEMPLATE_PARAID.into());
+		println!("account: {}", sovereign_account);
+		let _ = Balances::mint_into(&sovereign_account, 10000);
+
+		// Submit message
+		let message = Message {
+			event_log: mock_event_log_invalid_channel(),
+			proof: Proof {
+				block_hash: Default::default(),
+				tx_index: Default::default(),
+				data: Default::default(),
+			},
+		};
+		assert_noop!(
+			InboundQueue::submit(origin.clone(), message.clone()),
+			Error::<Test>::InvalidChannel,
+		);
+	});
+}
+
+#[test]
+fn test_submit_with_invalid_gateway() {
+	new_tester().execute_with(|| {
+		let relayer: AccountId = Keyring::Bob.into();
+		let origin = RuntimeOrigin::signed(relayer);
+
+		// Deposit funds into sovereign account of Asset Hub (Statemint)
+		let sovereign_account = sibling_sovereign_account::<Test>(ASSET_HUB_PARAID.into());
+		let _ = Balances::mint_into(&sovereign_account, 10000);
+
+		// Submit message
+		let message = Message {
+			event_log: mock_event_log_invalid_gateway(),
+			proof: Proof {
+				block_hash: Default::default(),
+				tx_index: Default::default(),
+				data: Default::default(),
+			},
+		};
+		assert_noop!(
+			InboundQueue::submit(origin.clone(), message.clone()),
+			Error::<Test>::InvalidGateway
+		);
+	});
+}
+
+#[test]
+fn test_submit_with_invalid_nonce() {
+	new_tester().execute_with(|| {
+		let relayer: AccountId = Keyring::Bob.into();
+		let origin = RuntimeOrigin::signed(relayer);
+
+		// Deposit funds into sovereign account of Asset Hub (Statemint)
+		let sovereign_account = sibling_sovereign_account::<Test>(ASSET_HUB_PARAID.into());
+		let _ = Balances::mint_into(&sovereign_account, 10000);
+
+		// Submit message
+		let message = Message {
+			event_log: mock_event_log(),
+			proof: Proof {
+				block_hash: Default::default(),
+				tx_index: Default::default(),
+				data: Default::default(),
+			},
+		};
+		assert_ok!(InboundQueue::submit(origin.clone(), message.clone()));
+
+		let nonce: u64 = <Nonce<Test>>::get(ChannelId::from(hex!(
+			"c173fac324158e77fb5840738a1a541f633cbec8884c6a601c567d2b376a0539"
+		)));
+		assert_eq!(nonce, 1);
+
+		// Submit the same again
+		assert_noop!(
+			InboundQueue::submit(origin.clone(), message.clone()),
+			Error::<Test>::InvalidNonce
+		);
+	});
+}
+
+#[test]
+fn test_submit_no_funds_to_reward_relayers() {
+	new_tester().execute_with(|| {
+		let relayer: AccountId = Keyring::Bob.into();
+		let origin = RuntimeOrigin::signed(relayer);
+
+		// Reset balance of sovereign_account to zero so to trigger the FundsUnavailable error
+		let sovereign_account = sibling_sovereign_account::<Test>(ASSET_HUB_PARAID.into());
+		Balances::set_balance(&sovereign_account, 0);
+
+		// Submit message
+		let message = Message {
+			event_log: mock_event_log(),
+			proof: Proof {
+				block_hash: Default::default(),
+				tx_index: Default::default(),
+				data: Default::default(),
+			},
+		};
+		assert_noop!(
+			InboundQueue::submit(origin.clone(), message.clone()),
+			TokenError::FundsUnavailable
+		);
+	});
+}
+
+#[test]
+fn test_set_operating_mode() {
+	new_tester().execute_with(|| {
+		let relayer: AccountId = Keyring::Bob.into();
+		let origin = RuntimeOrigin::signed(relayer);
+		let message = Message {
+			event_log: mock_event_log(),
+			proof: Proof {
+				block_hash: Default::default(),
+				tx_index: Default::default(),
+				data: Default::default(),
+			},
+		};
+
+		assert_ok!(InboundQueue::set_operating_mode(
+			RuntimeOrigin::root(),
+			snowbridge_core::BasicOperatingMode::Halted
+		));
+
+		assert_noop!(InboundQueue::submit(origin, message), Error::<Test>::Halted);
+	});
+}
+
+#[test]
+fn test_set_operating_mode_root_only() {
+	new_tester().execute_with(|| {
+		assert_noop!(
+			InboundQueue::set_operating_mode(
+				RuntimeOrigin::signed(Keyring::Bob.into()),
+				snowbridge_core::BasicOperatingMode::Halted
+			),
+			DispatchError::BadOrigin
+		);
+	});
+}

bridges/snowbridge/pallets/inbound-queue/src/weights.rs

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+//! Autogenerated weights for `snowbridge_inbound_queue`
+//!
+//! THIS FILE WAS AUTO-GENERATED USING THE SUBSTRATE BENCHMARK CLI VERSION 4.0.0-dev
+//! DATE: 2023-07-14, STEPS: `50`, REPEAT: `20`, LOW RANGE: `[]`, HIGH RANGE: `[]`
+//! WORST CASE MAP SIZE: `1000000`
+//! HOSTNAME: `macbook pro 14 m2`, CPU: `m2-arm64`
+//! EXECUTION: Some(Wasm), WASM-EXECUTION: Compiled, CHAIN: Some("bridge-hub-rococo-dev"), DB CACHE: 1024
+
+#![cfg_attr(rustfmt, rustfmt_skip)]
+#![allow(unused_parens)]
+#![allow(unused_imports)]
+
+use frame_support::{traits::Get, weights::{Weight, constants::RocksDbWeight}};
+use sp_std::marker::PhantomData;
+
+/// Weight functions needed for ethereum_beacon_client.
+pub trait WeightInfo {
+    fn submit() -> Weight;
+}
+
+// For backwards compatibility and tests
+impl WeightInfo for () {
+    fn submit() -> Weight {
+        Weight::from_parts(70_000_000, 0)
+            .saturating_add(Weight::from_parts(0, 3601))
+            .saturating_add(RocksDbWeight::get().reads(2))
+            .saturating_add(RocksDbWeight::get().writes(2))
+    }
+}