mock.rs

// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot 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.

// Polkadot 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 Polkadot.  If not, see <http://www.gnu.org/licenses/>.

//! A mock runtime for XCM benchmarking.

use crate::{generic, mock::*, *};
use codec::Decode;
use frame_support::{
	derive_impl, parameter_types,
	traits::{Contains, Everything, OriginTrait},
};
use sp_runtime::traits::TrailingZeroInput;
use xcm_builder::{
	test_utils::{
		AssetsInHolding, TestAssetExchanger, TestAssetLocker, TestAssetTrap,
		TestSubscriptionService, TestUniversalAliases,
	},
	AliasForeignAccountId32, AllowUnpaidExecutionFrom, FrameTransactionalProcessor,
};
use xcm_executor::traits::ConvertOrigin;

type Block = frame_system::mocking::MockBlock<Test>;

frame_support::construct_runtime!(
	pub enum Test
	{
		System: frame_system,
		Balances: pallet_balances,
		XcmGenericBenchmarks: generic,
	}
);

#[derive_impl(frame_system::config_preludes::TestDefaultConfig)]
impl frame_system::Config for Test {
	type Block = Block;
	type AccountData = pallet_balances::AccountData<u64>;
}

/// The benchmarks in this pallet should never need an asset transactor to begin with.
pub struct NoAssetTransactor;
impl xcm_executor::traits::TransactAsset for NoAssetTransactor {
	fn deposit_asset(_: &Asset, _: &Location, _: Option<&XcmContext>) -> Result<(), XcmError> {
		unreachable!();
	}

	fn withdraw_asset(
		_: &Asset,
		_: &Location,
		_: Option<&XcmContext>,
	) -> Result<AssetsInHolding, XcmError> {
		unreachable!();
	}
}

parameter_types! {
	pub const MaxInstructions: u32 = 100;
	pub const MaxAssetsIntoHolding: u32 = 64;
}

pub struct OnlyParachains;
impl Contains<Location> for OnlyParachains {
	fn contains(location: &Location) -> bool {
		matches!(location.unpack(), (0, [Parachain(_)]))
	}
}

type Aliasers = AliasForeignAccountId32<OnlyParachains>;
pub struct XcmConfig;
impl xcm_executor::Config for XcmConfig {
	type RuntimeCall = RuntimeCall;
	type XcmSender = DevNull;
	type AssetTransactor = NoAssetTransactor;
	type OriginConverter = AlwaysSignedByDefault<RuntimeOrigin>;
	type IsReserve = AllAssetLocationsPass;
	type IsTeleporter = ();
	type UniversalLocation = UniversalLocation;
	type Barrier = AllowUnpaidExecutionFrom<Everything>;
	type Weigher = xcm_builder::FixedWeightBounds<UnitWeightCost, RuntimeCall, MaxInstructions>;
	type Trader = xcm_builder::FixedRateOfFungible<WeightPrice, ()>;
	type ResponseHandler = DevNull;
	type AssetTrap = TestAssetTrap;
	type AssetLocker = TestAssetLocker;
	type AssetExchanger = TestAssetExchanger;
	type AssetClaims = TestAssetTrap;
	type SubscriptionService = TestSubscriptionService;
	type PalletInstancesInfo = AllPalletsWithSystem;
	type MaxAssetsIntoHolding = MaxAssetsIntoHolding;
	type FeeManager = ();
	// No bridges yet...
	type MessageExporter = ();
	type UniversalAliases = TestUniversalAliases;
	type CallDispatcher = RuntimeCall;
	type SafeCallFilter = Everything;
	type Aliasers = Aliasers;
	type TransactionalProcessor = FrameTransactionalProcessor;
	type HrmpNewChannelOpenRequestHandler = ();
	type HrmpChannelAcceptedHandler = ();
	type HrmpChannelClosingHandler = ();
}

parameter_types! {
	pub const ExistentialDeposit: u64 = 7;
}

#[derive_impl(pallet_balances::config_preludes::TestDefaultConfig)]
impl pallet_balances::Config for Test {
	type ReserveIdentifier = [u8; 8];
	type AccountStore = System;
}

impl crate::Config for Test {
	type XcmConfig = XcmConfig;
	type AccountIdConverter = AccountIdConverter;
	type DeliveryHelper = ();
	fn valid_destination() -> Result<Location, BenchmarkError> {
		let valid_destination: Location =
			Junction::AccountId32 { network: None, id: [0u8; 32] }.into();

		Ok(valid_destination)
	}
	fn worst_case_holding(depositable_count: u32) -> Assets {
		generate_holding_assets(
			<XcmConfig as xcm_executor::Config>::MaxAssetsIntoHolding::get() - depositable_count,
		)
	}
}

impl generic::Config for Test {
	type TransactAsset = Balances;
	type RuntimeCall = RuntimeCall;

	fn worst_case_response() -> (u64, Response) {
		let assets: Assets = (AssetId(Here.into()), 100).into();
		(0, Response::Assets(assets))
	}

	fn worst_case_asset_exchange() -> Result<(Assets, Assets), BenchmarkError> {
		Ok(Default::default())
	}

	fn universal_alias() -> Result<(Location, Junction), BenchmarkError> {
		Ok((Here.into(), GlobalConsensus(ByGenesis([0; 32]))))
	}

	fn transact_origin_and_runtime_call(
	) -> Result<(Location, <Self as generic::Config>::RuntimeCall), BenchmarkError> {
		Ok((Default::default(), frame_system::Call::remark_with_event { remark: vec![] }.into()))
	}

	fn subscribe_origin() -> Result<Location, BenchmarkError> {
		Ok(Default::default())
	}

	fn claimable_asset() -> Result<(Location, Location, Assets), BenchmarkError> {
		let assets: Assets = (AssetId(Here.into()), 100).into();
		let ticket = Location { parents: 0, interior: [GeneralIndex(0)].into() };
		Ok((Default::default(), ticket, assets))
	}

	fn fee_asset() -> Result<Asset, BenchmarkError> {
		Ok(Asset { id: AssetId(Here.into()), fun: Fungible(1_000_000) })
	}

	fn unlockable_asset() -> Result<(Location, Location, Asset), BenchmarkError> {
		let assets: Asset = (AssetId(Here.into()), 100).into();
		Ok((Default::default(), account_id_junction::<Test>(1).into(), assets))
	}

	fn export_message_origin_and_destination(
	) -> Result<(Location, NetworkId, InteriorLocation), BenchmarkError> {
		// No MessageExporter in tests
		Err(BenchmarkError::Skip)
	}

	fn alias_origin() -> Result<(Location, Location), BenchmarkError> {
		let origin: Location = (Parachain(1), AccountId32 { network: None, id: [0; 32] }).into();
		let target: Location = AccountId32 { network: None, id: [0; 32] }.into();
		Ok((origin, target))
	}
}

#[cfg(feature = "runtime-benchmarks")]
pub fn new_test_ext() -> sp_io::TestExternalities {
	use sp_runtime::BuildStorage;
	let t = RuntimeGenesisConfig { ..Default::default() }.build_storage().unwrap();
	sp_tracing::try_init_simple();
	t.into()
}

pub struct AlwaysSignedByDefault<RuntimeOrigin>(core::marker::PhantomData<RuntimeOrigin>);
impl<RuntimeOrigin> ConvertOrigin<RuntimeOrigin> for AlwaysSignedByDefault<RuntimeOrigin>
where
	RuntimeOrigin: OriginTrait,
	<RuntimeOrigin as OriginTrait>::AccountId: Decode,
{
	fn convert_origin(
		_origin: impl Into<Location>,
		_kind: OriginKind,
	) -> Result<RuntimeOrigin, Location> {
		Ok(RuntimeOrigin::signed(
			<RuntimeOrigin as OriginTrait>::AccountId::decode(&mut TrailingZeroInput::zeroes())
				.expect("infinite length input; no invalid inputs for type; qed"),
		))
	}
}