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// Copyright 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/>.
use super::{
AccountId, Balances, ParachainInfo, ParachainSystem, PolkadotXcm, Runtime, RuntimeCall,
RuntimeEvent, RuntimeOrigin, WeightToFee, XcmpQueue,
};
use frame_support::{
match_types, parameter_types,
traits::{Everything, Nothing},
};
use pallet_xcm::XcmPassthrough;
use parachains_common::xcm_config::{
ConcreteNativeAssetFrom, DenyReserveTransferToRelayChain, DenyThenTry,
};
use polkadot_parachain::primitives::Sibling;
use polkadot_runtime_common::impls::ToAuthor;
use xcm::latest::prelude::*;
use xcm_builder::{
AccountId32Aliases, AllowKnownQueryResponses, AllowSubscriptionsFrom,
AllowTopLevelPaidExecutionFrom, AllowUnpaidExecutionFrom, CurrencyAdapter, EnsureXcmOrigin,
IsConcrete, LocationInverter, ParentAsSuperuser, ParentIsPreset, RelayChainAsNative,
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SiblingParachainAsNative, SiblingParachainConvertsVia, SignedAccountId32AsNative,
SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit, UsingComponents,
WeightInfoBounds,
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};
use xcm_executor::XcmExecutor;
parameter_types! {
pub const RelayLocation: MultiLocation = MultiLocation::parent();
pub const RelayNetwork: NetworkId = NetworkId::Any;
pub RelayChainOrigin: RuntimeOrigin = cumulus_pallet_xcm::Origin::Relay.into();
pub Ancestry: MultiLocation = Parachain(ParachainInfo::parachain_id().into()).into();
pub const MaxInstructions: u32 = 100;
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}
/// 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<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.
(),
>;
/// 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 converts to a `Relay` origin when
// recognized.
RelayChainAsNative<RelayChainOrigin, RuntimeOrigin>,
// Native converter for sibling Parachains; will convert to a `SiblingPara` origin when
// recognized.
SiblingParachainAsNative<cumulus_pallet_xcm::Origin, RuntimeOrigin>,
// Superuser converter for the Relay-chain (Parent) location. This will allow it to issue a
// transaction from the Root origin.
ParentAsSuperuser<RuntimeOrigin>,
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// Native signed account converter; this just converts an `AccountId32` origin into a normal
// `Origin::Signed` origin of the same 32-byte value.
SignedAccountId32AsNative<RelayNetwork, RuntimeOrigin>,
// Xcm origins can be represented natively under the Xcm pallet's Xcm origin.
XcmPassthrough<RuntimeOrigin>,
);
match_types! {
pub type ParentOrParentsExecutivePlurality: impl Contains<MultiLocation> = {
MultiLocation { parents: 1, interior: Here } |
MultiLocation { parents: 1, interior: X1(Plurality { id: BodyId::Executive, .. }) }
};
pub type ParentOrSiblings: impl Contains<MultiLocation> = {
MultiLocation { parents: 1, interior: Here } |
MultiLocation { parents: 1, interior: X1(_) }
};
}
pub type Barrier = DenyThenTry<
DenyReserveTransferToRelayChain,
(
// Allow local users to buy weight credit.
TakeWeightCredit,
// Parent and its exec plurality get free execution.
AllowUnpaidExecutionFrom<ParentOrParentsExecutivePlurality>,
// Expected responses are OK.
AllowKnownQueryResponses<PolkadotXcm>,
// Subscriptions for version tracking are OK.
AllowSubscriptionsFrom<ParentOrSiblings>,
// Allow anything to pay for execution.
AllowTopLevelPaidExecutionFrom<Everything>,
),
>;
pub struct XcmConfig;
impl xcm_executor::Config for XcmConfig {
type RuntimeCall = RuntimeCall;
type XcmSender = XcmRouter;
type AssetTransactor = CurrencyTransactor;
type OriginConverter = XcmOriginToTransactDispatchOrigin;
// BridgeHub does not recognize a reserve location for any asset. Users must teleport Native token
// where allowed (e.g. with the Relay Chain).
type IsReserve = ();
/// Only allow teleportation of NativeToken of relay chain.
type IsTeleporter = ConcreteNativeAssetFrom<RelayLocation>;
type LocationInverter = LocationInverter<Ancestry>;
type Barrier = Barrier;
type Weigher = WeightInfoBounds<
crate::weights::xcm::BridgeHubRococoXcmWeight<RuntimeCall>,
RuntimeCall,
MaxInstructions,
>;
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type Trader =
UsingComponents<WeightToFee, RelayLocation, AccountId, Balances, ToAuthor<Runtime>>;
type ResponseHandler = PolkadotXcm;
type AssetTrap = PolkadotXcm;
type AssetClaims = PolkadotXcm;
type SubscriptionService = PolkadotXcm;
}
/// Converts a local signed origin into an XCM multilocation.
/// Forms the basis for local origins sending/executing XCMs.
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,
);
impl pallet_xcm::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
// We want to disallow users sending (arbitrary) XCMs from this chain.
type SendXcmOrigin = EnsureXcmOrigin<RuntimeOrigin, ()>;
type XcmRouter = XcmRouter;
// We support local origins dispatching XCM executions in principle...
type ExecuteXcmOrigin = EnsureXcmOrigin<RuntimeOrigin, LocalOriginToLocation>;
// ... but disallow generic XCM execution. As a result only teleports are allowed.
type XcmExecuteFilter = Nothing;
type XcmExecutor = XcmExecutor<XcmConfig>;
type XcmTeleportFilter = Everything;
type XcmReserveTransferFilter = Nothing; // This parachain is not meant as a reserve location.
type Weigher = WeightInfoBounds<
crate::weights::xcm::BridgeHubRococoXcmWeight<RuntimeCall>,
RuntimeCall,
MaxInstructions,
>;
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type LocationInverter = LocationInverter<Ancestry>;
type RuntimeOrigin = RuntimeOrigin;
type RuntimeCall = RuntimeCall;
const VERSION_DISCOVERY_QUEUE_SIZE: u32 = 100;
type AdvertisedXcmVersion = pallet_xcm::CurrentXcmVersion;
}
impl cumulus_pallet_xcm::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
type XcmExecutor = XcmExecutor<XcmConfig>;
}