Foreign Assets Migration

pallets/moonbeam-foreign-assets/src/evm.rs

@@ -32,12 +32,13 @@ use xcm::latest::Error as XcmError;
 const ERC20_CALL_MAX_CALLDATA_SIZE: usize = 4 + 32 + 32; // selector + address + uint256
 const ERC20_CREATE_MAX_CALLDATA_SIZE: usize = 16 * 1024; // 16Ko
 
-// Hardcoded gas limits (from manueal binary search)
-const ERC20_CREATE_GAS_LIMIT: u64 = 3_367_000; // highest failure: 3_366_000
+// Hardcoded gas limits (from manual binary search)
+const ERC20_CREATE_GAS_LIMIT: u64 = 3_410_000; // highest failure: 3_406_000
 pub(crate) const ERC20_BURN_FROM_GAS_LIMIT: u64 = 155_000; // highest failure: 154_000
 pub(crate) const ERC20_MINT_INTO_GAS_LIMIT: u64 = 155_000; // highest failure: 154_000
 const ERC20_PAUSE_GAS_LIMIT: u64 = 150_000; // highest failure: 149_500
 pub(crate) const ERC20_TRANSFER_GAS_LIMIT: u64 = 155_000; // highest failure: 154_000
+pub(crate) const ERC20_APPROVE_GAS_LIMIT: u64 = 154_000; // highest failure: 153_000
 const ERC20_UNPAUSE_GAS_LIMIT: u64 = 150_000; // highest failure: 149_500
 
 pub enum EvmError {
@@ -247,6 +248,51 @@ impl<T: crate::Config> EvmCaller<T> {
 		Ok(())
 	}
 
+	pub(crate) fn erc20_approve(
+		erc20_contract_address: H160,
+		owner: H160,
+		spender: H160,
+		amount: U256,
+	) -> Result<(), EvmError> {
+		let mut input = Vec::with_capacity(ERC20_CALL_MAX_CALLDATA_SIZE);
+		// Selector
+		input.extend_from_slice(&keccak256!("approve(address,uint256)")[..4]);
+		// append spender address
+		input.extend_from_slice(H256::from(spender).as_bytes());
+		// append amount to be approved
+		input.extend_from_slice(H256::from_uint(&amount).as_bytes());
+		let weight_limit: Weight =
+			T::GasWeightMapping::gas_to_weight(ERC20_APPROVE_GAS_LIMIT, true);
+
+		let exec_info = T::EvmRunner::call(
+			owner,
+			erc20_contract_address,
+			input,
+			U256::default(),
+			ERC20_APPROVE_GAS_LIMIT,
+			None,
+			None,
+			None,
+			Default::default(),
+			false,
+			false,
+			Some(weight_limit),
+			Some(0),
+			&<T as pallet_evm::Config>::config(),
+		)
+		.map_err(|_| EvmError::EvmCallFail)?;
+
+		ensure!(
+			matches!(
+				exec_info.exit_reason,
+				ExitReason::Succeed(ExitSucceed::Returned | ExitSucceed::Stopped)
+			),
+			EvmError::EvmCallFail
+		);
+
+		Ok(())
+	}
+
 	pub(crate) fn erc20_burn_from(
 		erc20_contract_address: H160,
 		who: H160,

pallets/moonbeam-foreign-assets/src/lib.rs

@@ -235,13 +235,61 @@ pub mod pallet {
 
 		/// Compute asset contract address from asset id
 		#[inline]
-		pub(crate) fn contract_address_from_asset_id(asset_id: AssetId) -> H160 {
+		pub fn contract_address_from_asset_id(asset_id: AssetId) -> H160 {
 			let mut buffer = [0u8; 20];
 			buffer[..4].copy_from_slice(&FOREIGN_ASSETS_PREFIX);
 			buffer[4..].copy_from_slice(&asset_id.to_be_bytes());
 			H160(buffer)
 		}
 
+		pub fn register_foreign_asset(
+			asset_id: AssetId,
+			xcm_location: Location,
+			decimals: u8,
+			symbol: BoundedVec<u8, ConstU32<256>>,
+			name: BoundedVec<u8, ConstU32<256>>,
+		) -> DispatchResult {
+			// Ensure such an assetId does not exist
+			ensure!(
+				!AssetsById::<T>::contains_key(&asset_id),
+				Error::<T>::AssetAlreadyExists
+			);
+
+			ensure!(
+				!AssetsByLocation::<T>::contains_key(&xcm_location),
+				Error::<T>::LocationAlreadyExists
+			);
+
+			ensure!(
+				AssetsById::<T>::count() < T::MaxForeignAssets::get(),
+				Error::<T>::TooManyForeignAssets
+			);
+
+			ensure!(
+				T::AssetIdFilter::contains(&asset_id),
+				Error::<T>::AssetIdFiltered
+			);
+
+			let symbol = core::str::from_utf8(&symbol).map_err(|_| Error::<T>::InvalidSymbol)?;
+			let name = core::str::from_utf8(&name).map_err(|_| Error::<T>::InvalidTokenName)?;
+
+			let contract_address = EvmCaller::<T>::erc20_create(asset_id, decimals, symbol, name)?;
+
+			// Insert the association assetId->foreigAsset
+			// Insert the association foreigAsset->assetId
+			AssetsById::<T>::insert(&asset_id, &xcm_location);
+			AssetsByLocation::<T>::insert(&xcm_location, (asset_id, AssetStatus::Active));
+
+			T::OnForeignAssetCreated::on_asset_created(&xcm_location, &asset_id);
+
+			Self::deposit_event(Event::ForeignAssetCreated {
+				contract_address,
+				asset_id,
+				xcm_location,
+			});
+			Ok(())
+		}
+
 		/// Mint an asset into a specific account
 		pub fn mint_into(
 			asset_id: AssetId,
@@ -259,6 +307,25 @@ pub mod pallet {
 			})
 			.map_err(Into::into)
 		}
+
+		/// Aprrove a spender to spend a certain amount of tokens from the owner account
+		pub fn approve(
+			asset_id: AssetId,
+			owner: T::AccountId,
+			spender: T::AccountId,
+			amount: U256,
+		) -> Result<(), evm::EvmError> {
+			// We perform the evm call in a storage transaction to ensure that if it fail
+			// any contract storage changes are rolled back.
+			EvmCaller::<T>::erc20_approve(
+				Self::contract_address_from_asset_id(asset_id),
+				T::AccountIdToH160::convert(owner),
+				T::AccountIdToH160::convert(spender),
+				amount,
+			)
+			.map_err(Into::into)
+		}
+
 		pub fn weight_of_erc20_burn() -> Weight {
 			T::GasWeightMapping::gas_to_weight(evm::ERC20_BURN_FROM_GAS_LIMIT, true)
 		}

pallets/moonbeam-lazy-migrations/Cargo.toml

@@ -13,13 +13,19 @@ frame-support = { workspace = true }
 frame-system = { workspace = true }
 pallet-scheduler = { workspace = true }
 pallet-assets = { workspace = true }
+pallet-asset-manager = { workspace = true }
 pallet-balances = { workspace = true }
+pallet-moonbeam-foreign-assets = { workspace = true }
 parity-scale-codec = { workspace = true }
 scale-info = { workspace = true, features = ["derive"] }
 sp-core = { workspace = true }
 sp-io = { workspace = true }
 sp-runtime = { workspace = true }
 sp-std = { workspace = true }
+xcm = { workspace = true }
+xcm-primitives = { workspace = true }
+
+environmental = { workspace = true }
 
 # Frontier
 pallet-evm = { workspace = true, features = ["forbid-evm-reentrancy"] }
@@ -34,13 +40,15 @@ frame-benchmarking = { workspace = true, optional = true }
 frame-benchmarking = { workspace = true, features = ["std"] }
 pallet-balances = { workspace = true, features = ["std", "insecure_zero_ed"] }
 pallet-timestamp = { workspace = true, features = ["std"] }
+precompile-utils = { workspace = true, features = ["std"] }
 rlp = { workspace = true, features = ["std"] }
 sp-io = { workspace = true, features = ["std"] }
 
 [features]
 default = ["std"]
 runtime-benchmarks = ["frame-benchmarking"]
 std = [
+  "environmental/std",
   "pallet-balances/std",
   "frame-support/std",
   "frame-system/std",
@@ -52,7 +60,11 @@ std = [
   "pallet-evm/std",
   "pallet-timestamp/std",
   "pallet-assets/std",
+  "pallet-moonbeam-foreign-assets/std",
+  "pallet-asset-manager/std", 
+  "precompile-utils/std",
   "cumulus-primitives-storage-weight-reclaim/std",
   "rlp/std",
+  "xcm-primitives/std",
 ]
 try-runtime = ["frame-support/try-runtime"]