Foreign assets creation via token reserve

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

@@ -16,18 +16,27 @@
 
 #![cfg(feature = "runtime-benchmarks")]
 
-use crate::{AssetStatus, Call, Config, Pallet};
-use frame_benchmarking::{benchmarks, impl_benchmark_test_suite};
+use crate::{pallet, AssetStatus, Call, Config, Pallet};
+use frame_benchmarking::{account, benchmarks, impl_benchmark_test_suite};
 use frame_support::pallet_prelude::*;
+use frame_support::traits::Currency;
 use frame_system::RawOrigin;
 use sp_runtime::traits::ConstU32;
 use sp_runtime::BoundedVec;
 use xcm::latest::prelude::*;
 
+fn create_funded_user<T: Config>(string: &'static str, n: u32, balance: u32) -> T::AccountId {
+	const SEED: u32 = 0;
+	let user = account(string, n, SEED);
+	let _ = <T as pallet::Config>::Currency::make_free_balance_be(&user, balance.into());
+	let _ = <T as pallet::Config>::Currency::issue(balance.into());
+	user
+}
 fn create_n_foreign_asset<T: Config>(n: u32) -> DispatchResult {
+	let user: T::AccountId = create_funded_user::<T>("user", n, 100);
 	for i in 1..=n {
 		Pallet::<T>::create_foreign_asset(
-			RawOrigin::Root.into(),
+			RawOrigin::Signed(user.clone()).into(),
 			i as u128,
 			location_of(i),
 			18,
@@ -53,7 +62,7 @@ benchmarks! {
 	create_foreign_asset {
 		create_n_foreign_asset::<T>(T::MaxForeignAssets::get().saturating_sub(1))?;
 		let asset_id = T::MaxForeignAssets::get() as u128;
-	}: _(RawOrigin::Root, asset_id, Location::parent(), 18, str_to_bv("MT"), str_to_bv("Mytoken"))
+	}: _(RawOrigin::Signed(create_funded_user::<T>("user", 1, 100)), asset_id, Location::parent(), 18, str_to_bv("MT"), str_to_bv("Mytoken"))
 	verify {
 		assert_eq!(
 			Pallet::<T>::assets_by_id(asset_id),

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

@@ -107,8 +107,9 @@ pub enum AssetStatus {
 #[pallet]
 pub mod pallet {
 	use super::*;
+	use frame_support::traits::{Currency, ReservableCurrency};
 	use pallet_evm::{GasWeightMapping, Runner};
-	use sp_runtime::traits::{AccountIdConversion, Convert};
+	use sp_runtime::traits::{AccountIdConversion, AtLeast32BitUnsigned, Convert};
 	use xcm_executor::traits::ConvertLocation;
 	use xcm_executor::traits::Error as MatchError;
 	use xcm_executor::AssetsInHolding;
@@ -121,7 +122,7 @@ pub mod pallet {
 	pub const PALLET_ID: frame_support::PalletId = frame_support::PalletId(*b"forgasst");
 
 	#[pallet::config]
-	pub trait Config: frame_system::Config + pallet_evm::Config {
+	pub trait Config: frame_system::Config + pallet_evm::Config + scale_info::TypeInfo {
 		// Convert AccountId to H160
 		type AccountIdToH160: Convert<Self::AccountId, H160>;
 
@@ -147,7 +148,7 @@ pub mod pallet {
 		/// Hook to be called when new foreign asset is registered.
 		type OnForeignAssetCreated: ForeignAssetCreatedHook<Location>;
 
-		/// Maximum nulmbers of differnt foreign assets
+		/// Maximum numbers of differnt foreign assets
 		type MaxForeignAssets: Get<u32>;
 
 		/// The overarching event type.
@@ -158,8 +159,27 @@ pub mod pallet {
 
 		// Convert XCM Location to H160
 		type XcmLocationToH160: ConvertLocation<H160>;
+
+		/// Amount of tokens required to lock for creating a new foreign asset
+		type ForeignAssetCreationDeposit: Get<BalanceOf<Self>>;
+
+		/// The balance type for locking funds
+		type Balance: Member
+			+ Parameter
+			+ AtLeast32BitUnsigned
+			+ Default
+			+ Copy
+			+ MaybeSerializeDeserialize
+			+ MaxEncodedLen
+			+ TypeInfo;
+
+		/// The currency type for locking funds
+		type Currency: ReservableCurrency<Self::AccountId>;
 	}
 
+	type BalanceOf<T> =
+		<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;
+
 	pub type AssetBalance = U256;
 	pub type AssetId = u128;
 
@@ -177,6 +197,9 @@ pub mod pallet {
 		EvmCallPauseFail,
 		EvmCallUnpauseFail,
 		EvmInternalError,
+		/// Account has insufficient balance for locking
+		InsufficientBalance,
+		OriginIsNotAssetCreator,
 		InvalidSymbol,
 		InvalidTokenName,
 		LocationAlreadyExists,
@@ -191,6 +214,7 @@ pub mod pallet {
 			contract_address: H160,
 			asset_id: AssetId,
 			xcm_location: Location,
+			deposit: Option<BalanceOf<T>>,
 		},
 		/// Changed the xcm type mapping for a given asset id
 		ForeignAssetXcmLocationChanged {
@@ -207,6 +231,10 @@ pub mod pallet {
 			asset_id: AssetId,
 			xcm_location: Location,
 		},
+		/// Tokens have been locked for asset creation
+		TokensLocked(T::AccountId, AssetId, AssetBalance),
+		/// Lock verification failed
+		LockVerificationFailed(T::AccountId, AssetId),
 	}
 
 	/// Mapping from an asset id to a Foreign asset type.
@@ -225,6 +253,24 @@ pub mod pallet {
 	pub type AssetsByLocation<T: Config> =
 		StorageMap<_, Blake2_128Concat, Location, (AssetId, AssetStatus)>;
 
+	/// Mapping from an asset id to its creation details
+	#[pallet::storage]
+	#[pallet::getter(fn assets_creation_details)]
+	pub type AssetsCreationDetails<T: Config> =
+		StorageMap<_, Blake2_128Concat, AssetId, AssetCreationDetails<T>>;
+
+	#[derive(Clone, Eq, PartialEq, Debug, Encode, Decode, TypeInfo, MaxEncodedLen)]
+	pub enum AssetOwner<T: Config + scale_info::TypeInfo> {
+		Governance,
+		Account(T::AccountId),
+	}
+
+	#[derive(Clone, Decode, Encode, Eq, PartialEq, Debug, TypeInfo, MaxEncodedLen)]
+	pub struct AssetCreationDetails<T: Config + scale_info::TypeInfo> {
+		pub owner: AssetOwner<T>,
+		pub deposit: Option<BalanceOf<T>>,
+	}
+
 	impl<T: Config> Pallet<T> {
 		/// The account ID of this pallet
 		#[inline]
@@ -242,6 +288,8 @@ pub mod pallet {
 			H160(buffer)
 		}
 
+		/// This method only exists for migration purposes and will be deleted once the
+		/// foreign assets migration is finished.
 		pub fn register_foreign_asset(
 			asset_id: AssetId,
 			xcm_location: Location,
@@ -274,18 +322,25 @@ pub mod pallet {
 			let name = core::str::from_utf8(&name).map_err(|_| Error::<T>::InvalidTokenName)?;
 
 			let contract_address = EvmCaller::<T>::erc20_create(asset_id, decimals, symbol, name)?;
+			let owner = AssetOwner::<T>::Governance;
 
 			// 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);
+			AssetsCreationDetails::<T>::insert(
+				&asset_id,
+				AssetCreationDetails {
+					owner,
+					deposit: None,
+				},
+			);
 
 			Self::deposit_event(Event::ForeignAssetCreated {
 				contract_address,
 				asset_id,
 				xcm_location,
+				deposit: None,
 			});
 			Ok(())
 		}
@@ -355,7 +410,7 @@ pub mod pallet {
 			symbol: BoundedVec<u8, ConstU32<256>>,
 			name: BoundedVec<u8, ConstU32<256>>,
 		) -> DispatchResult {
-			T::ForeignAssetCreatorOrigin::ensure_origin(origin)?;
+			T::ForeignAssetCreatorOrigin::ensure_origin(origin.clone())?;
 
 			// Ensure such an assetId does not exist
 			ensure!(
@@ -380,20 +435,35 @@ pub mod pallet {
 
 			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 owner_account = ensure_signed(origin)?;
 			let contract_address = EvmCaller::<T>::erc20_create(asset_id, decimals, symbol, name)?;
+			let deposit = T::ForeignAssetCreationDeposit::get();
+			let owner = AssetOwner::<T>::Account(owner_account.clone());
 
 			// 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));
 
+			// Reserve _deposit_ amount of funds from the caller
+			<T as Config>::Currency::reserve(&owner_account, deposit)?;
+
+			// Insert the amount that is reserved from the user
+			AssetsCreationDetails::<T>::insert(
+				&asset_id,
+				AssetCreationDetails {
+					owner,
+					deposit: Some(deposit),
+				},
+			);
+
 			T::OnForeignAssetCreated::on_asset_created(&xcm_location, &asset_id);
 
 			Self::deposit_event(Event::ForeignAssetCreated {
 				contract_address,
 				asset_id,
 				xcm_location,
+				deposit: Some(deposit),
 			});
 			Ok(())
 		}

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

@@ -19,7 +19,7 @@ use crate as pallet_moonbeam_foreign_assets;
 
 use frame_support::traits::Everything;
 use frame_support::{construct_runtime, pallet_prelude::*, parameter_types};
-use frame_system::EnsureRoot;
+use frame_system::{EnsureRoot, EnsureSigned};
 use pallet_evm::{FrameSystemAccountProvider, SubstrateBlockHashMapping};
 use precompile_utils::testing::MockAccount;
 use sp_core::{H256, U256};
@@ -29,6 +29,7 @@ use xcm::latest::Location;
 
 pub type Balance = u128;
 
+pub type BlockNumber = u32;
 type AccountId = MockAccount;
 type Block = frame_system::mocking::MockBlock<Test>;
 
@@ -176,11 +177,15 @@ impl sp_runtime::traits::Convert<AccountId, H160> for AccountIdToH160 {
 	}
 }
 
+parameter_types! {
+	pub const ForeignAssetCreationDeposit: u128 = 1;
+}
+
 impl crate::Config for Test {
 	type AccountIdToH160 = AccountIdToH160;
 	type AssetIdFilter = Everything;
 	type EvmRunner = pallet_evm::runner::stack::Runner<Self>;
-	type ForeignAssetCreatorOrigin = EnsureRoot<AccountId>;
+	type ForeignAssetCreatorOrigin = EnsureSigned<AccountId>;
 	type ForeignAssetFreezerOrigin = EnsureRoot<AccountId>;
 	type ForeignAssetModifierOrigin = EnsureRoot<AccountId>;
 	type ForeignAssetUnfreezerOrigin = EnsureRoot<AccountId>;
@@ -189,6 +194,10 @@ impl crate::Config for Test {
 	type RuntimeEvent = RuntimeEvent;
 	type WeightInfo = ();
 	type XcmLocationToH160 = ();
+	type ForeignAssetCreationDeposit = ForeignAssetCreationDeposit;
+	type Balance = Balance;
+
+	type Currency = Balances;
 }
 
 pub(crate) struct ExtBuilder {
@@ -217,6 +226,11 @@ impl ExtBuilder {
 		ext.execute_with(|| System::set_block_number(1));
 		ext
 	}
+
+	pub fn with_balances(mut self, balances: Vec<(AccountId, Balance)>) -> Self {
+		self.balances = balances;
+		self
+	}
 }
 
 pub(crate) fn events() -> Vec<super::Event<Test>> {