// 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 .
use super::{
AccountId, AllPalletsWithSystem, Balances, ParachainInfo, ParachainSystem, PolkadotXcm,
Runtime, RuntimeCall, RuntimeEvent, RuntimeOrigin, WeightToFee, XcmpQueue,
};
use frame_support::{
match_types, parameter_types,
traits::{ConstU32, Contains, Everything, Nothing},
};
use frame_system::EnsureRoot;
use pallet_xcm::XcmPassthrough;
use parachains_common::{
impls::ToStakingPot,
xcm_config::{ConcreteNativeAssetFrom, DenyReserveTransferToRelayChain, DenyThenTry},
};
use polkadot_parachain::primitives::Sibling;
use xcm::latest::prelude::*;
use xcm_builder::{
AccountId32Aliases, AllowExplicitUnpaidExecutionFrom, AllowKnownQueryResponses,
AllowSubscriptionsFrom, AllowTopLevelPaidExecutionFrom, CurrencyAdapter, EnsureXcmOrigin,
IsConcrete, ParentAsSuperuser, ParentIsPreset, RelayChainAsNative, SiblingParachainAsNative,
SiblingParachainConvertsVia, SignedAccountId32AsNative, SignedToAccountId32,
SovereignSignedViaLocation, TakeWeightCredit, UsingComponents, WeightInfoBounds,
WithComputedOrigin,
};
use xcm_executor::{traits::WithOriginFilter, XcmExecutor};
parameter_types! {
pub const RelayLocation: MultiLocation = MultiLocation::parent();
pub const RelayNetwork: Option = Some(NetworkId::Rococo);
pub RelayChainOrigin: RuntimeOrigin = cumulus_pallet_xcm::Origin::Relay.into();
pub UniversalLocation: InteriorMultiLocation =
X2(GlobalConsensus(RelayNetwork::get().unwrap()), Parachain(ParachainInfo::parachain_id().into()));
pub const MaxInstructions: u32 = 100;
pub const MaxAssetsIntoHolding: u32 = 64;
}
/// 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,
// Sibling parachain origins convert to AccountId via the `ParaId::into`.
SiblingParachainConvertsVia,
// Straight up local `AccountId32` origins just alias directly to `AccountId`.
AccountId32Aliases,
);
/// 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,
// 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 of `Balances`.
(),
>;
/// 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,
// Native converter for Relay-chain (Parent) location; will converts to a `Relay` origin when
// recognized.
RelayChainAsNative,
// Native converter for sibling Parachains; will convert to a `SiblingPara` origin when
// recognized.
SiblingParachainAsNative,
// Superuser converter for the Relay-chain (Parent) location. This will allow it to issue a
// transaction from the Root origin.
ParentAsSuperuser,
// Native signed account converter; this just converts an `AccountId32` origin into a normal
// `RuntimeOrigin::Signed` origin of the same 32-byte value.
SignedAccountId32AsNative,
// Xcm origins can be represented natively under the Xcm pallet's Xcm origin.
XcmPassthrough,
);
match_types! {
pub type ParentOrParentsPlurality: impl Contains = {
MultiLocation { parents: 1, interior: Here } |
MultiLocation { parents: 1, interior: X1(Plurality { .. }) }
};
pub type ParentOrSiblings: impl Contains = {
MultiLocation { parents: 1, interior: Here } |
MultiLocation { parents: 1, interior: X1(_) }
};
}
/// A call filter for the XCM Transact instruction. This is a temporary measure until we properly
/// account for proof size weights.
///
/// Calls that are allowed through this filter must:
/// 1. Have a fixed weight;
/// 2. Cannot lead to another call being made;
/// 3. Have a defined proof size weight, e.g. no unbounded vecs in call parameters.
pub struct SafeCallFilter;
impl Contains for SafeCallFilter {
fn contains(call: &RuntimeCall) -> bool {
#[cfg(feature = "runtime-benchmarks")]
{
if matches!(call, RuntimeCall::System(frame_system::Call::remark_with_event { .. })) {
return true
}
}
match call {
RuntimeCall::PolkadotXcm(pallet_xcm::Call::force_xcm_version { .. }) |
RuntimeCall::System(
frame_system::Call::set_heap_pages { .. } |
frame_system::Call::set_code { .. } |
frame_system::Call::set_code_without_checks { .. } |
frame_system::Call::kill_prefix { .. },
) |
RuntimeCall::ParachainSystem(..) |
RuntimeCall::Timestamp(..) |
RuntimeCall::Balances(..) |
RuntimeCall::CollatorSelection(
pallet_collator_selection::Call::set_desired_candidates { .. } |
pallet_collator_selection::Call::set_candidacy_bond { .. } |
pallet_collator_selection::Call::register_as_candidate { .. } |
pallet_collator_selection::Call::leave_intent { .. },
) |
RuntimeCall::Session(pallet_session::Call::purge_keys { .. }) |
RuntimeCall::XcmpQueue(..) |
RuntimeCall::DmpQueue(..) |
RuntimeCall::Utility(pallet_utility::Call::as_derivative { .. }) => true,
_ => false,
}
}
}
pub type Barrier = DenyThenTry<
DenyReserveTransferToRelayChain,
(
// Allow local users to buy weight credit.
TakeWeightCredit,
// Expected responses are OK.
AllowKnownQueryResponses,
WithComputedOrigin<
(
// If the message is one that immediately attemps to pay for execution, then allow it.
AllowTopLevelPaidExecutionFrom,
// Parent and its pluralities (i.e. governance bodies) get free execution.
AllowExplicitUnpaidExecutionFrom,
// Subscriptions for version tracking are OK.
AllowSubscriptionsFrom,
),
UniversalLocation,
ConstU32<8>,
>,
),
>;
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;
type UniversalLocation = UniversalLocation;
type Barrier = Barrier;
type Weigher = WeightInfoBounds<
crate::weights::xcm::BridgeHubRococoXcmWeight,
RuntimeCall,
MaxInstructions,
>;
type Trader =
UsingComponents>;
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 = WithOriginFilter;
type SafeCallFilter = SafeCallFilter;
}
/// Converts a local signed origin into an XCM multilocation.
/// Forms the basis for local origins sending/executing XCMs.
pub type LocalOriginToLocation = SignedToAccountId32;
/// 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,
// ..and XCMP to communicate with the sibling chains.
XcmpQueue,
);
#[cfg(feature = "runtime-benchmarks")]
parameter_types! {
pub ReachableDest: Option = Some(Parent.into());
}
impl pallet_xcm::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
// We want to disallow users sending (arbitrary) XCMs from this chain.
type SendXcmOrigin = EnsureXcmOrigin;
type XcmRouter = XcmRouter;
// We support local origins dispatching XCM executions in principle...
type ExecuteXcmOrigin = EnsureXcmOrigin;
// ... but disallow generic XCM execution. As a result only teleports are allowed.
type XcmExecuteFilter = Nothing;
type XcmExecutor = XcmExecutor;
type XcmTeleportFilter = Everything;
type XcmReserveTransferFilter = Nothing; // This parachain is not meant as a reserve location.
type Weigher = WeightInfoBounds<
crate::weights::xcm::BridgeHubRococoXcmWeight,
RuntimeCall,
MaxInstructions,
>;
type UniversalLocation = UniversalLocation;
type RuntimeOrigin = RuntimeOrigin;
type RuntimeCall = RuntimeCall;
const VERSION_DISCOVERY_QUEUE_SIZE: u32 = 100;
type AdvertisedXcmVersion = pallet_xcm::CurrentXcmVersion;
type Currency = Balances;
type CurrencyMatcher = ();
type TrustedLockers = ();
type SovereignAccountOf = LocationToAccountId;
type MaxLockers = ConstU32<8>;
type WeightInfo = crate::weights::pallet_xcm::WeightInfo;
#[cfg(feature = "runtime-benchmarks")]
type ReachableDest = ReachableDest;
type AdminOrigin = EnsureRoot;
}
impl cumulus_pallet_xcm::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
type XcmExecutor = XcmExecutor;
}