git.delta.rocks / unique-network / refs/commits / ec6ce248bb21

1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617use cumulus_primitives_core::XcmContext;18use frame_support::{19	traits::{tokens::currency::Currency as CurrencyT, Get, OnUnbalanced as OnUnbalancedT},20	weights::WeightToFeePolynomial,21};22use pallet_foreign_assets::{AssetIds, NativeCurrency};23use sp_runtime::traits::{CheckedConversion, Convert, Zero};24use sp_std::marker::PhantomData;25use staging_xcm::latest::{26	AssetId::Concrete, Error as XcmError, Fungibility::Fungible as XcmFungible, Junction::*,27	Junctions::*, MultiAsset, MultiLocation, Weight,28};29use staging_xcm_builder::{CurrencyAdapter, NativeAsset};30use staging_xcm_executor::{31	traits::{MatchesFungible, WeightTrader},32	Assets,33};34use up_common::types::{AccountId, Balance};3536use super::{LocationToAccountId, RelayLocation};37use crate::{Balances, ParachainInfo};3839pub struct OnlySelfCurrency;40impl<B: TryFrom<u128>> MatchesFungible<B> for OnlySelfCurrency {41	fn matches_fungible(a: &MultiAsset) -> Option<B> {42		let paraid = Parachain(ParachainInfo::parachain_id().into());43		match (&a.id, &a.fun) {44			(45				Concrete(MultiLocation {46					parents: 1,47					interior: X1(loc),48				}),49				XcmFungible(ref amount),50			) if paraid == *loc => CheckedConversion::checked_from(*amount),51			(52				Concrete(MultiLocation {53					parents: 0,54					interior: Here,55				}),56				XcmFungible(ref amount),57			) => CheckedConversion::checked_from(*amount),58			_ => None,59		}60	}61}6263/// Means for transacting assets on this chain.64pub type LocalAssetTransactor = CurrencyAdapter<65	// Use this currency:66	Balances,67	// Use this currency when it is a fungible asset matching the given location or name:68	OnlySelfCurrency,69	// Do a simple punn to convert an AccountId32 MultiLocation into a native chain account ID:70	LocationToAccountId,71	// Our chain's account ID type (we can't get away without mentioning it explicitly):72	AccountId,73	// We don't track any teleports.74	(),75>;7677pub type AssetTransactor = LocalAssetTransactor;7879pub type IsReserve = NativeAsset;8081pub struct UsingOnlySelfCurrencyComponents<82	WeightToFee: WeightToFeePolynomial<Balance = Currency::Balance>,83	AssetId: Get<MultiLocation>,84	AccountId,85	Currency: CurrencyT<AccountId>,86	OnUnbalanced: OnUnbalancedT<Currency::NegativeImbalance>,87>(88	Weight,89	Currency::Balance,90	PhantomData<(WeightToFee, AssetId, AccountId, Currency, OnUnbalanced)>,91);92impl<93		WeightToFee: WeightToFeePolynomial<Balance = Currency::Balance>,94		AssetId: Get<MultiLocation>,95		AccountId,96		Currency: CurrencyT<AccountId>,97		OnUnbalanced: OnUnbalancedT<Currency::NegativeImbalance>,98	> WeightTrader99	for UsingOnlySelfCurrencyComponents<WeightToFee, AssetId, AccountId, Currency, OnUnbalanced>100{101	fn new() -> Self {102		// FIXME: benchmark103		Self(Weight::from_parts(0, 0), Zero::zero(), PhantomData)104	}105106	fn buy_weight(107		&mut self,108		_weight: Weight,109		payment: Assets,110		_xcm: &XcmContext,111	) -> Result<Assets, XcmError> {112		Ok(payment)113	}114}115impl<116		WeightToFee: WeightToFeePolynomial<Balance = Currency::Balance>,117		AssetId: Get<MultiLocation>,118		AccountId,119		Currency: CurrencyT<AccountId>,120		OnUnbalanced: OnUnbalancedT<Currency::NegativeImbalance>,121	> Drop122	for UsingOnlySelfCurrencyComponents<WeightToFee, AssetId, AccountId, Currency, OnUnbalanced>123{124	fn drop(&mut self) {125		OnUnbalanced::on_unbalanced(Currency::issue(self.1));126	}127}128129pub type Trader<T> = UsingOnlySelfCurrencyComponents<130	pallet_configuration::WeightToFee<T, Balance>,131	RelayLocation,132	AccountId,133	Balances,134	(),135>;136137pub struct CurrencyIdConvert;138impl Convert<AssetIds, Option<MultiLocation>> for CurrencyIdConvert {139	fn convert(id: AssetIds) -> Option<MultiLocation> {140		match id {141			AssetIds::NativeAssetId(NativeCurrency::Here) => Some(MultiLocation::new(142				1,143				X1(Parachain(ParachainInfo::get().into())),144			)),145			_ => None,146		}147	}148}