pezkuwi-runtime-templates/runtime/src/xcm_config.rs

use frame_support::{
    match_types, parameter_types,
    traits::{ConstU32, Everything, Nothing},
    weights::Weight,
};
use frame_system::EnsureRoot;
use pallet_xcm::XcmPassthrough;
use polkadot_parachain_primitives::primitives::Sibling;
use polkadot_runtime_common::impls::ToAuthor;
use xcm::latest::prelude::*;
use xcm_builder::{
    AccountId32Aliases, AllowExplicitUnpaidExecutionFrom, AllowTopLevelPaidExecutionFrom,
    CurrencyAdapter, DenyReserveTransferToRelayChain, DenyThenTry, EnsureXcmOrigin,
    FixedWeightBounds, IsConcrete, NativeAsset, ParentIsPreset, RelayChainAsNative,
    SiblingParachainAsNative, SiblingParachainConvertsVia, SignedAccountId32AsNative,
    SignedToAccountId32, SovereignSignedViaLocation, TakeWeightCredit, TrailingSetTopicAsId,
    UsingComponents, WithComputedOrigin, WithUniqueTopic,
};
use xcm_executor::XcmExecutor;

use super::{
    AccountId, AllPalletsWithSystem, Balances, ParachainInfo, ParachainSystem, PolkadotXcm,
    Runtime, RuntimeCall, RuntimeEvent, RuntimeOrigin, WeightToFee, XcmpQueue,
};

parameter_types! {
    pub const RelayLocation: MultiLocation = MultiLocation::parent();
    pub const RelayNetwork: Option<NetworkId> = None;
    pub RelayChainOrigin: RuntimeOrigin = cumulus_pallet_xcm::Origin::Relay.into();
    pub UniversalLocation: InteriorMultiLocation = Parachain(ParachainInfo::parachain_id().into()).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 LocalAssetTransactor = 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 convert 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>,
    // 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.
    XcmPassthrough<RuntimeOrigin>,
);

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);
    pub const MaxInstructions: u32 = 100;
    pub const MaxAssetsIntoHolding: u32 = 64;
}

match_types! {
    pub type ParentOrParentsExecutivePlurality: impl Contains<MultiLocation> = {
        MultiLocation { parents: 1, interior: Here } |
        MultiLocation { parents: 1, interior: X1(Plurality { id: BodyId::Executive, .. }) }
    };
}

pub type Barrier = TrailingSetTopicAsId<
    DenyThenTry<
        DenyReserveTransferToRelayChain,
        (
            TakeWeightCredit,
            WithComputedOrigin<
                (
                    AllowTopLevelPaidExecutionFrom<Everything>,
                    AllowExplicitUnpaidExecutionFrom<ParentOrParentsExecutivePlurality>,
                    // ^^^ Parent and its exec plurality get free execution
                ),
                UniversalLocation,
                ConstU32<8>,
            >,
        ),
    >,
>;

pub struct XcmConfig;
impl xcm_executor::Config for XcmConfig {
    type Aliasers = Nothing;
    type AssetClaims = PolkadotXcm;
    type AssetExchanger = ();
    type AssetLocker = ();
    // How to withdraw and deposit an asset.
    type AssetTransactor = LocalAssetTransactor;
    type AssetTrap = PolkadotXcm;
    type Barrier = Barrier;
    type CallDispatcher = RuntimeCall;
    type FeeManager = ();
    type IsReserve = NativeAsset;
    type IsTeleporter = ();
    type MaxAssetsIntoHolding = MaxAssetsIntoHolding;
    type MessageExporter = ();
    type OriginConverter = XcmOriginToTransactDispatchOrigin;
    type PalletInstancesInfo = AllPalletsWithSystem;
    type ResponseHandler = PolkadotXcm;
    type RuntimeCall = RuntimeCall;
    type SafeCallFilter = Everything;
    type SubscriptionService = PolkadotXcm;
    type Trader =
        UsingComponents<WeightToFee, RelayLocation, AccountId, Balances, ToAuthor<Runtime>>;
    type UniversalAliases = Nothing;
    // Teleporting is disabled.
    type UniversalLocation = UniversalLocation;
    type Weigher = FixedWeightBounds<UnitWeightCost, RuntimeCall, MaxInstructions>;
    type XcmSender = XcmRouter;
}

/// 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 = WithUniqueTopic<(
    // Two routers - use UMP to communicate with the relay chain:
    cumulus_primitives_utility::ParentAsUmp<ParachainSystem, (), ()>,
    // ..and XCMP to communicate with the sibling chains.
    XcmpQueue,
)>;

#[cfg(feature = "runtime-benchmarks")]
parameter_types! {
    pub ReachableDest: Option<MultiLocation> = Some(Parent.into());
}

impl pallet_xcm::Config for Runtime {
    type AdminOrigin = EnsureRoot<AccountId>;
    // ^ Override for AdvertisedXcmVersion default
    type AdvertisedXcmVersion = pallet_xcm::CurrentXcmVersion;
    type Currency = Balances;
    type CurrencyMatcher = ();
    type ExecuteXcmOrigin = EnsureXcmOrigin<RuntimeOrigin, LocalOriginToLocation>;
    type MaxLockers = ConstU32<8>;
    type MaxRemoteLockConsumers = ConstU32<0>;
    #[cfg(feature = "runtime-benchmarks")]
    type ReachableDest = ReachableDest;
    type RemoteLockConsumerIdentifier = ();
    type RuntimeCall = RuntimeCall;
    type RuntimeEvent = RuntimeEvent;
    type RuntimeOrigin = RuntimeOrigin;
    type SendXcmOrigin = EnsureXcmOrigin<RuntimeOrigin, LocalOriginToLocation>;
    type SovereignAccountOf = LocationToAccountId;
    type TrustedLockers = ();
    type UniversalLocation = UniversalLocation;
    type Weigher = FixedWeightBounds<UnitWeightCost, RuntimeCall, MaxInstructions>;
    type WeightInfo = pallet_xcm::TestWeightInfo;
    type XcmExecuteFilter = Nothing;
    // ^ Disable dispatchable execute on the XCM pallet.
    // Needs to be `Everything` for local testing.
    type XcmExecutor = XcmExecutor<XcmConfig>;
    type XcmReserveTransferFilter = Nothing;
    type XcmRouter = XcmRouter;
    type XcmTeleportFilter = Everything;

    const VERSION_DISCOVERY_QUEUE_SIZE: u32 = 100;
}

impl cumulus_pallet_xcm::Config for Runtime {
    type RuntimeEvent = RuntimeEvent;
    type XcmExecutor = XcmExecutor<XcmConfig>;
}