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// Copyright 2019-2022 Parity Technologies (UK) Ltd.
// This file is part of Cumulus.
// Cumulus 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.
// Cumulus 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 Cumulus. If not, see <http://www.gnu.org/licenses/>.
//! Holds the XCM specific configuration that would otherwise be in lib.rs
//!
//! This configuration dictates how the Penpal chain will communicate with other chains.
//!
//! One of the main uses of the penpal chain will be to be a benefactor of reserve asset transfers
//! with statemine as the reserve. At present no derivative tokens are minted on receipt of a
//! ReserveAssetTransferDeposited message but that will but the intension will be to support this soon.
use super::{
AccountId, AllPalletsWithSystem, AssetId as AssetIdPalletAssets, Assets, Balance, Balances,
ParachainInfo, ParachainSystem, PolkadotXcm, Runtime, RuntimeCall, RuntimeEvent, RuntimeOrigin,
WeightToFee, XcmpQueue,
};
use core::marker::PhantomData;
use frame_support::{
Branislav Kontur
committed
match_types, parameter_types,
fungibles::{self, Balanced, Credit},
ConstU32, Contains, ContainsPair, Everything, Get, Nothing,
use pallet_asset_tx_payment::HandleCredit;
use pallet_xcm::XcmPassthrough;
Branislav Kontur
committed
use parachains_common::xcm_config::{DenyReserveTransferToRelayChain, DenyThenTry};
use polkadot_parachain::primitives::Sibling;
use polkadot_runtime_common::impls::ToAuthor;
use sp_runtime::traits::Zero;
Branislav Kontur
committed
use xcm::latest::prelude::*;
AccountId32Aliases, AllowExplicitUnpaidExecutionFrom, AllowKnownQueryResponses,
AllowSubscriptionsFrom, AllowTopLevelPaidExecutionFrom, AsPrefixedGeneralIndex,
ConvertedConcreteId, CurrencyAdapter, EnsureXcmOrigin, FixedWeightBounds, FungiblesAdapter,
IsConcrete, LocalMint, NativeAsset, ParentIsPreset, RelayChainAsNative,
SiblingParachainAsNative, SiblingParachainConvertsVia, SignedAccountId32AsNative,
SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit, UsingComponents,
WithComputedOrigin,
parameter_types! {
pub const RelayLocation: MultiLocation = MultiLocation::parent();
pub RelayChainOrigin: RuntimeOrigin = cumulus_pallet_xcm::Origin::Relay.into();
pub UniversalLocation: InteriorMultiLocation = X1(Parachain(ParachainInfo::parachain_id().into()));
}
/// 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 assets 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<RelayLocation>,
// Do a simple punn to convert an AccountId32 MultiLocation into a native chain 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.
(),
>;
/// 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:
AssetIdPalletAssets,
Balance,
AsPrefixedGeneralIndex<CommonGoodAssetsPalletLocation, AssetIdPalletAssets, 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.
// 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, RuntimeOrigin>,
// Native converter for Relay-chain (Parent) location; will convert to a `Relay` origin when
RelayChainAsNative<RelayChainOrigin, RuntimeOrigin>,
// Native converter for sibling Parachains; will convert to a `SiblingPara` origin when
// recognized.
SiblingParachainAsNative<cumulus_pallet_xcm::Origin, RuntimeOrigin>,
// Native signed account converter; this just converts an `AccountId32` origin into a normal
// `RuntimeOrigin::Signed` origin of the same 32-byte value.
SignedAccountId32AsNative<RelayNetwork, RuntimeOrigin>,
// Xcm origins can be represented natively under the Xcm pallet's Xcm origin.
);
parameter_types! {
// One XCM operation is 1_000_000_000 weight - almost certainly a conservative estimate.
pub UnitWeightCost: Weight = Weight::from_parts(1_000_000_000, 64 * 1024);
}
match_types! {
pub type ParentOrParentsExecutivePlurality: impl Contains<MultiLocation> = {
MultiLocation { parents: 1, interior: Here } |
MultiLocation { parents: 1, interior: X1(Plurality { id: BodyId::Executive, .. }) }
};
pub type CommonGoodAssetsParachain: impl Contains<MultiLocation> = {
MultiLocation { parents: 1, interior: X1(Parachain(1000)) }
};
}
pub type Barrier = DenyThenTry<
DenyReserveTransferToRelayChain,
(
TakeWeightCredit,
// Expected responses are OK.
AllowKnownQueryResponses<PolkadotXcm>,
// Allow XCMs with some computed origins to pass through.
WithComputedOrigin<
(
// If the message is one that immediately attemps to pay for execution, then allow it.
AllowTopLevelPaidExecutionFrom<Everything>,
// Common Good Assets parachain, parent and its exec plurality get free execution
AllowExplicitUnpaidExecutionFrom<(
CommonGoodAssetsParachain,
ParentOrParentsExecutivePlurality,
)>,
// Subscriptions for version tracking are OK.
AllowSubscriptionsFrom<Everything>,
),
UniversalLocation,
ConstU32<8>,
>,
),
>;
/// Type alias to conveniently refer to `frame_system`'s `Config::AccountId`.
pub type AccountIdOf<R> = <R as frame_system::Config>::AccountId;
/// Asset filter that allows all assets from a certain location.
pub struct AssetsFrom<T>(PhantomData<T>);
impl<T: Get<MultiLocation>> ContainsPair<MultiAsset, MultiLocation> for AssetsFrom<T> {
fn contains(asset: &MultiAsset, origin: &MultiLocation) -> bool {
let loc = T::get();
&loc == origin &&
matches!(asset, MultiAsset { id: AssetId::Concrete(asset_loc), fun: Fungible(_a) }
if asset_loc.match_and_split(&loc).is_some())
}
}
/// Allow checking in assets that have issuance > 0.
pub struct NonZeroIssuance<AccountId, Assets>(PhantomData<(AccountId, Assets)>);
impl<AccountId, Assets> Contains<<Assets as fungibles::Inspect<AccountId>>::AssetId>
for NonZeroIssuance<AccountId, Assets>
where
Assets: fungibles::Inspect<AccountId>,
{
fn contains(id: &<Assets as fungibles::Inspect<AccountId>>::AssetId) -> bool {
!Assets::total_issuance(*id).is_zero()
}
}
/// A `HandleCredit` implementation that naively transfers the fees to the block author.
/// Will drop and burn the assets in case the transfer fails.
pub struct AssetsToBlockAuthor<R>(PhantomData<R>);
impl<R> HandleCredit<AccountIdOf<R>, pallet_assets::Pallet<R>> for AssetsToBlockAuthor<R>
where
R: pallet_authorship::Config + pallet_assets::Config,
AccountIdOf<R>: From<polkadot_primitives::AccountId> + Into<polkadot_primitives::AccountId>,
fn handle_credit(credit: Credit<AccountIdOf<R>, pallet_assets::Pallet<R>>) {
if let Some(author) = pallet_authorship::Pallet::<R>::author() {
// In case of error: Will drop the result triggering the `OnDrop` of the imbalance.
let _ = pallet_assets::Pallet::<R>::resolve(&author, credit);
}
}
}
pub trait Reserve {
/// Returns assets reserve location.
fn reserve(&self) -> Option<MultiLocation>;
}
// Takes the chain part of a MultiAsset
impl Reserve for MultiAsset {
fn reserve(&self) -> Option<MultiLocation> {
let first_interior = location.first_interior();
let parents = location.parent_count();
match (parents, first_interior) {
(0, Some(Parachain(id))) => Some(MultiLocation::new(0, X1(Parachain(*id)))),
(1, Some(Parachain(id))) => Some(MultiLocation::new(1, X1(Parachain(*id)))),
(1, _) => Some(MultiLocation::parent()),
_ => None,
}
} else {
None
}
}
}
/// A `FilterAssetLocation` implementation. Filters multi native assets whose
/// reserve is same with `origin`.
pub struct MultiNativeAsset;
impl ContainsPair<MultiAsset, MultiLocation> for MultiNativeAsset {
fn contains(asset: &MultiAsset, origin: &MultiLocation) -> bool {
if let Some(ref reserve) = asset.reserve() {
if reserve == origin {
return true
}
}
false
}
}
parameter_types! {
pub CommonGoodAssetsLocation: MultiLocation = MultiLocation::new(1, X1(Parachain(1000)));
// ALWAYS ensure that the index in PalletInstance stays up-to-date with
// Statemint's Assets pallet index
pub CommonGoodAssetsPalletLocation: MultiLocation =
MultiLocation::new(1, X2(Parachain(1000), PalletInstance(50)));
pub CheckingAccount: AccountId = PolkadotXcm::check_account();
}
pub type Reserves = (NativeAsset, AssetsFrom<CommonGoodAssetsLocation>);
pub struct XcmConfig;
impl xcm_executor::Config for XcmConfig {
type XcmSender = XcmRouter;
// How to withdraw and deposit an asset.
type AssetTransactor = AssetTransactors;
type OriginConverter = XcmOriginToTransactDispatchOrigin;
type IsReserve = MultiNativeAsset; // TODO: maybe needed to be replaced by Reserves
type IsTeleporter = NativeAsset;
type Weigher = FixedWeightBounds<UnitWeightCost, RuntimeCall, MaxInstructions>;
type Trader =
UsingComponents<WeightToFee, RelayLocation, AccountId, Balances, ToAuthor<Runtime>>;
type ResponseHandler = PolkadotXcm;
type AssetTrap = PolkadotXcm;
type AssetClaims = PolkadotXcm;
type SubscriptionService = PolkadotXcm;
type PalletInstancesInfo = AllPalletsWithSystem;
type MaxAssetsIntoHolding = MaxAssetsIntoHolding;
type AssetLocker = ();
type AssetExchanger = ();
type FeeManager = ();
type MessageExporter = ();
type UniversalAliases = Nothing;
type CallDispatcher = RuntimeCall;
type SafeCallFilter = Everything;
}
/// No local origins on this chain are allowed to dispatch XCM sends/executions.
pub type LocalOriginToLocation = SignedToAccountId32<RuntimeOrigin, 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,
);
#[cfg(feature = "runtime-benchmarks")]
parameter_types! {
pub ReachableDest: Option<MultiLocation> = Some(Parent.into());
}
type SendXcmOrigin = EnsureXcmOrigin<RuntimeOrigin, LocalOriginToLocation>;
type ExecuteXcmOrigin = EnsureXcmOrigin<RuntimeOrigin, LocalOriginToLocation>;
type XcmExecuteFilter = Nothing;
// ^ Disable dispatchable execute on the XCM pallet.
// Needs to be `Everything` for local testing.
type XcmExecutor = XcmExecutor<XcmConfig>;
type XcmTeleportFilter = Everything;
type XcmReserveTransferFilter = Everything;
type Weigher = FixedWeightBounds<UnitWeightCost, RuntimeCall, MaxInstructions>;
const VERSION_DISCOVERY_QUEUE_SIZE: u32 = 100;
// ^ Override for AdvertisedXcmVersion default
type AdvertisedXcmVersion = pallet_xcm::CurrentXcmVersion;
type Currency = Balances;
type CurrencyMatcher = ();
type TrustedLockers = ();
type SovereignAccountOf = LocationToAccountId;
type MaxLockers = ConstU32<8>;
type WeightInfo = pallet_xcm::TestWeightInfo;
#[cfg(feature = "runtime-benchmarks")]
type ReachableDest = ReachableDest;
type AdminOrigin = EnsureRoot<AccountId>;
type MaxRemoteLockConsumers = ConstU32<0>;
type RemoteLockConsumerIdentifier = ();
}
impl cumulus_pallet_xcm::Config for Runtime {
type XcmExecutor = XcmExecutor<XcmConfig>;
}