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// Copyright (C) 2022 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use super::{
AccountId, AssetId, Assets, Authorship, Balance, Balances, Call, Event, Origin, ParachainInfo,
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Keith Yeung
committed
ParachainSystem, PolkadotXcm, Runtime, WeightToFee, XcmpQueue,
};
use frame_support::{
match_types, parameter_types,
traits::{Everything, PalletInfoAccess},
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Keith Yeung
committed
weights::Weight,
};
use pallet_xcm::XcmPassthrough;
use parachains_common::{
impls::ToStakingPot,
xcm_config::{
AssetFeeAsExistentialDepositMultiplier, DenyReserveTransferToRelayChain, DenyThenTry,
},
use polkadot_parachain::primitives::Sibling;
use sp_runtime::traits::ConvertInto;
use xcm::latest::prelude::*;
use xcm_builder::{
AccountId32Aliases, AllowKnownQueryResponses, AllowSubscriptionsFrom,
AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom, AsPrefixedGeneralIndex,
ConvertedConcreteAssetId, CurrencyAdapter, EnsureXcmOrigin, FixedWeightBounds,
FungiblesAdapter, IsConcrete, LocationInverter, NativeAsset, ParentAsSuperuser, ParentIsPreset,
RelayChainAsNative, SiblingParachainAsNative, SiblingParachainConvertsVia,
SignedAccountId32AsNative, SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit,
UsingComponents,
};
use xcm_executor::{traits::JustTry, XcmExecutor};
parameter_types! {
pub const WestendLocation: MultiLocation = MultiLocation::parent();
pub RelayNetwork: NetworkId =
NetworkId::Named(b"Westend".to_vec().try_into().expect("less than length limit; qed"));
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pub RelayChainOrigin: Origin = cumulus_pallet_xcm::Origin::Relay.into();
pub Ancestry: MultiLocation = Parachain(ParachainInfo::parachain_id().into()).into();
pub const Local: MultiLocation = Here.into();
pub AssetsPalletLocation: MultiLocation =
PalletInstance(<Assets as PalletInfoAccess>::index() as u8).into();
pub CheckingAccount: AccountId = PolkadotXcm::check_account();
}
/// Type for specifying how a `MultiLocation` can be converted into an `AccountId`. This is used
/// when determining ownership of accounts for asset transacting and when attempting to use XCM
/// `Transact` in order to determine the dispatch Origin.
pub type LocationToAccountId = (
// The parent (Relay-chain) origin converts to the parent `AccountId`.
ParentIsPreset<AccountId>,
// Sibling parachain origins convert to AccountId via the `ParaId::into`.
SiblingParachainConvertsVia<Sibling, AccountId>,
// Straight up local `AccountId32` origins just alias directly to `AccountId`.
AccountId32Aliases<RelayNetwork, AccountId>,
);
/// Means for transacting the native currency on this chain.
pub type CurrencyTransactor = CurrencyAdapter<
// Use this currency:
Balances,
// Use this currency when it is a fungible asset matching the given location or name:
IsConcrete<WestendLocation>,
// Convert an XCM MultiLocation into a local account id:
LocationToAccountId,
// Our chain's account ID type (we can't get away without mentioning it explicitly):
AccountId,
// We don't track any teleports of `Balances`.
(),
>;
/// Means for transacting assets besides the native currency on this chain.
pub type FungiblesTransactor = FungiblesAdapter<
// Use this fungibles implementation:
Assets,
// Use this currency when it is a fungible asset matching the given location or name:
ConvertedConcreteAssetId<
AssetId,
Balance,
AsPrefixedGeneralIndex<AssetsPalletLocation, AssetId, JustTry>,
JustTry,
>,
// Convert an XCM MultiLocation into a local account id:
LocationToAccountId,
// Our chain's account ID type (we can't get away without mentioning it explicitly):
AccountId,
// We only want to allow teleports of known assets. We use non-zero issuance as an indication
// that this asset is known.
parachains_common::impls::NonZeroIssuance<AccountId, Assets>,
// The account to use for tracking teleports.
CheckingAccount,
>;
/// Means for transacting assets on this chain.
pub type AssetTransactors = (CurrencyTransactor, FungiblesTransactor);
/// This is the type we use to convert an (incoming) XCM origin into a local `Origin` instance,
/// ready for dispatching a transaction with Xcm's `Transact`. There is an `OriginKind` which can
/// biases the kind of local `Origin` it will become.
pub type XcmOriginToTransactDispatchOrigin = (
// Sovereign account converter; this attempts to derive an `AccountId` from the origin location
// using `LocationToAccountId` and then turn that into the usual `Signed` origin. Useful for
// foreign chains who want to have a local sovereign account on this chain which they control.
SovereignSignedViaLocation<LocationToAccountId, Origin>,
// Native converter for Relay-chain (Parent) location; will convert to a `Relay` origin when
// recognised.
RelayChainAsNative<RelayChainOrigin, Origin>,
// Native converter for sibling Parachains; will convert to a `SiblingPara` origin when
// recognised.
SiblingParachainAsNative<cumulus_pallet_xcm::Origin, Origin>,
// Superuser converter for the Relay-chain (Parent) location. This will allow it to issue a
// transaction from the Root origin.
ParentAsSuperuser<Origin>,
// Native signed account converter; this just converts an `AccountId32` origin into a normal
// `Origin::Signed` origin of the same 32-byte value.
SignedAccountId32AsNative<RelayNetwork, Origin>,
// Xcm origins can be represented natively under the Xcm pallet's Xcm origin.
XcmPassthrough<Origin>,
);
parameter_types! {
// One XCM operation is 1_000_000_000 weight - almost certainly a conservative estimate.
pub UnitWeightCost: Weight = 1_000_000_000;
pub const MaxInstructions: u32 = 100;
pub XcmAssetFeesReceiver: Option<AccountId> = Authorship::author();
match_types! {
pub type ParentOrParentsPlurality: impl Contains<MultiLocation> = {
MultiLocation { parents: 1, interior: Here } |
MultiLocation { parents: 1, interior: X1(Plurality { .. }) }
};
}
pub type Barrier = DenyThenTry<
DenyReserveTransferToRelayChain,
(
TakeWeightCredit,
AllowTopLevelPaidExecutionFrom<Everything>,
// Parent and its plurality get free execution
AllowUnpaidExecutionFrom<ParentOrParentsPlurality>,
// Expected responses are OK.
AllowKnownQueryResponses<PolkadotXcm>,
// Subscriptions for version tracking are OK.
AllowSubscriptionsFrom<Everything>,
),
>;
pub struct XcmConfig;
impl xcm_executor::Config for XcmConfig {
type Call = Call;
type XcmSender = XcmRouter;
type AssetTransactor = AssetTransactors;
type OriginConverter = XcmOriginToTransactDispatchOrigin;
// Westmint does not recognize a reserve location for any asset. This does not prevent
// Westmint acting _as_ a reserve location for WND and assets created under `pallet-assets`.
// For WND, users must use teleport where allowed (e.g. with the Relay Chain).
type IsReserve = ();
type IsTeleporter = NativeAsset; // <- should be enough to allow teleportation of WND
type LocationInverter = LocationInverter<Ancestry>;
type Barrier = Barrier;
type Weigher = FixedWeightBounds<UnitWeightCost, Call, MaxInstructions>;
type Trader = (
UsingComponents<WeightToFee, WestendLocation, AccountId, Balances, ToStakingPot<Runtime>>,
cumulus_primitives_utility::TakeFirstAssetTrader<
AccountId,
AssetFeeAsExistentialDepositMultiplier<
Runtime,
WeightToFee,
pallet_assets::BalanceToAssetBalance<Balances, Runtime, ConvertInto>,
>,
ConvertedConcreteAssetId<
AssetId,
Balance,
AsPrefixedGeneralIndex<AssetsPalletLocation, AssetId, JustTry>,
JustTry,
>,
Assets,
cumulus_primitives_utility::XcmFeesTo32ByteAccount<
FungiblesTransactor,
AccountId,
XcmAssetFeesReceiver,
>,
>,
);
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type ResponseHandler = PolkadotXcm;
type AssetTrap = PolkadotXcm;
type AssetClaims = PolkadotXcm;
type SubscriptionService = PolkadotXcm;
}
/// Local origins on this chain are allowed to dispatch XCM sends/executions.
pub type LocalOriginToLocation = SignedToAccountId32<Origin, AccountId, RelayNetwork>;
/// The means for routing XCM messages which are not for local execution into the right message
/// queues.
pub type XcmRouter = (
// Two routers - use UMP to communicate with the relay chain:
cumulus_primitives_utility::ParentAsUmp<ParachainSystem, PolkadotXcm>,
// ..and XCMP to communicate with the sibling chains.
XcmpQueue,
);
impl pallet_xcm::Config for Runtime {
type Event = Event;
type SendXcmOrigin = EnsureXcmOrigin<Origin, LocalOriginToLocation>;
type XcmRouter = XcmRouter;
type ExecuteXcmOrigin = EnsureXcmOrigin<Origin, LocalOriginToLocation>;
type XcmExecuteFilter = Everything;
type XcmExecutor = XcmExecutor<XcmConfig>;
type XcmTeleportFilter = Everything;
type XcmReserveTransferFilter = Everything;
type Weigher = FixedWeightBounds<UnitWeightCost, Call, MaxInstructions>;
type LocationInverter = LocationInverter<Ancestry>;
type Origin = Origin;
type Call = Call;
const VERSION_DISCOVERY_QUEUE_SIZE: u32 = 100;
type AdvertisedXcmVersion = pallet_xcm::CurrentXcmVersion;
}
impl cumulus_pallet_xcm::Config for Runtime {
type Event = Event;
type XcmExecutor = XcmExecutor<XcmConfig>;
}