git.delta.rocks / unique-network / refs/commits / fd782c893f4c

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/>.1617#![cfg_attr(not(feature = "std"), no_std)]1819use core::marker::PhantomData;20use fp_evm::WithdrawReason;21use frame_support::traits::{Currency, IsSubType};22pub use pallet::*;23use pallet_evm::{EVMCurrencyAdapter, EnsureAddressOrigin};24use sp_core::{H160, U256};25use sp_runtime::TransactionOutcome;26use up_sponsorship::SponsorshipHandler;27use up_evm_mapping::EvmBackwardsAddressMapping;28use pallet_evm::AddressMapping;2930#[frame_support::pallet]31pub mod pallet {32	use super::*;3334	use frame_support::traits::Currency;35	use sp_std::vec::Vec;3637	#[pallet::config]38	pub trait Config: frame_system::Config {39		type EvmSponsorshipHandler: SponsorshipHandler<H160, (H160, Vec<u8>)>;40		type Currency: Currency<Self::AccountId>;41		type EvmBackwardsAddressMapping: EvmBackwardsAddressMapping<Self::AccountId>;42		type EvmAddressMapping: AddressMapping<Self::AccountId>;43	}4445	#[pallet::pallet]46	#[pallet::generate_store(pub(super) trait Store)]47	pub struct Pallet<T>(_);48}4950type NegativeImbalanceOf<C, T> =51	<C as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance;5253pub struct ChargeEvmLiquidityInfo<T>54where55	T: Config,56	T: pallet_evm::Config,57{58	who: H160,59	negative_imbalance: NegativeImbalanceOf<<T as Config>::Currency, T>,60}6162pub struct TransactionValidityHack<T: Config>(PhantomData<*const T>);63impl<T: Config> fp_evm::TransactionValidityHack for TransactionValidityHack<T> {64	fn who_pays_fee(origin: H160, reason: &WithdrawReason) -> Option<H160> {65		match reason {66			WithdrawReason::Call { target, input } => {67				// This method is only used for checking, we shouldn't touch storage in it68				frame_support::storage::with_transaction(|| {69					TransactionOutcome::Rollback(T::EvmSponsorshipHandler::get_sponsor(70						&origin,71						&(*target, input.clone()),72					))73				})74			}75			_ => None,76		}77	}78}79pub struct OnChargeTransaction<T: Config>(PhantomData<*const T>);80impl<T> pallet_evm::OnChargeEVMTransaction<T> for OnChargeTransaction<T>81where82	T: Config,83	T: pallet_evm::Config,84{85	type LiquidityInfo = Option<ChargeEvmLiquidityInfo<T>>;8687	fn withdraw_fee(88		who: &H160,89		reason: WithdrawReason,90		fee: U256,91	) -> core::result::Result<Self::LiquidityInfo, pallet_evm::Error<T>> {92		let mut who_pays_fee = *who;93		if let WithdrawReason::Call { target, input } = &reason {94			who_pays_fee = T::EvmSponsorshipHandler::get_sponsor(who, &(*target, input.clone()))95				.unwrap_or(who_pays_fee);96		}97		let negative_imbalance = EVMCurrencyAdapter::<<T as Config>::Currency, ()>::withdraw_fee(98			&who_pays_fee,99			reason,100			fee,101		)?;102		Ok(negative_imbalance.map(|i| ChargeEvmLiquidityInfo {103			who: who_pays_fee,104			negative_imbalance: i,105		}))106	}107108	fn correct_and_deposit_fee(109		who: &H160,110		corrected_fee: U256,111		already_withdrawn: Self::LiquidityInfo,112	) {113		<EVMCurrencyAdapter<<T as Config>::Currency, ()> as pallet_evm::OnChargeEVMTransaction<T>>::correct_and_deposit_fee(114			&already_withdrawn.as_ref().map(|e| e.who).unwrap_or(*who),115			corrected_fee,116			already_withdrawn.map(|e| e.negative_imbalance),117		)118	}119120	fn pay_priority_fee(tip: U256) {121		<EVMCurrencyAdapter<<T as Config>::Currency, ()> as pallet_evm::OnChargeEVMTransaction<T>>::pay_priority_fee(tip)122	}123}124125/// Implements sponsoring for evm calls performed from pallet-evm (via api.tx.ethereum.transact/api.tx.evm.call)126pub struct BridgeSponsorshipHandler<T>(PhantomData<T>);127impl<T, C> SponsorshipHandler<T::AccountId, C> for BridgeSponsorshipHandler<T>128where129	T: Config + pallet_evm::Config,130	C: IsSubType<pallet_evm::Call<T>>,131{132	fn get_sponsor(who: &T::AccountId, call: &C) -> Option<T::AccountId> {133		match call.is_sub_type()? {134			pallet_evm::Call::call {135				source,136				target,137				input,138				..139			} => {140				let _ = T::CallOrigin::ensure_address_origin(141					source,142					<frame_system::RawOrigin<T::AccountId>>::Signed(who.clone()).into(),143				)144				.ok()?;145				let who = T::EvmBackwardsAddressMapping::from_account_id(who.clone());146				// Effects from EvmSponsorshipHandler are applied in OnChargeEvmTransaction by pallet_evm::runner147				// TODO: Should we implement simulation mode (test, but do not apply effects) in `up-sponsorship`?148				let sponsor = frame_support::storage::with_transaction(|| {149					TransactionOutcome::Rollback(T::EvmSponsorshipHandler::get_sponsor(150						&who,151						&(*target, input.clone()),152					))153				})?;154				let sponsor = T::EvmAddressMapping::into_account_id(sponsor);155				Some(sponsor)156			}157			_ => None,158		}159	}160}