git.delta.rocks / unique-network / refs/commits / d030d8a70b74

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, account::CrossAccountId};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 + pallet_evm::account::Config {39		type EvmSponsorshipHandler: SponsorshipHandler<Self::AccountId, (H160, Vec<u8>)>;40		type Currency: Currency<Self::AccountId>;41	}4243	#[pallet::pallet]44	#[pallet::generate_store(pub(super) trait Store)]45	pub struct Pallet<T>(_);46}4748type NegativeImbalanceOf<C, T> =49	<C as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance;5051pub struct ChargeEvmLiquidityInfo<T>52where53	T: Config,54	T: pallet_evm::Config,55{56	who: H160,57	negative_imbalance: NegativeImbalanceOf<<T as Config>::Currency, T>,58}5960pub struct TransactionValidityHack<T: Config>(PhantomData<*const T>);61impl<T: Config> fp_evm::TransactionValidityHack<T::AccountId> for TransactionValidityHack<T> {62	fn who_pays_fee(origin: H160, reason: &WithdrawReason) -> Option<T::AccountId> {63		match reason {64			WithdrawReason::Call { target, input } => {65				// This method is only used for checking, we shouldn't touch storage in it66				frame_support::storage::with_transaction(|| {67					let origin_sub = T::EvmAddressMapping::into_account_id(origin);68					TransactionOutcome::Rollback(T::EvmSponsorshipHandler::get_sponsor(69						&origin_sub,70						&(*target, input.clone()),71					))72				})73			}74			_ => None,75		}76	}77}78pub struct OnChargeTransaction<T: Config>(PhantomData<*const T>);79impl<T> pallet_evm::OnChargeEVMTransaction<T> for OnChargeTransaction<T>80where81	T: Config,82	T: pallet_evm::Config,83{84	type LiquidityInfo = Option<ChargeEvmLiquidityInfo<T>>;8586	fn withdraw_fee(87		who: &T::CrossAccountId,88		reason: WithdrawReason,89		fee: U256,90	) -> core::result::Result<Self::LiquidityInfo, pallet_evm::Error<T>> {91		let who_pays_fee;92		if let WithdrawReason::Call { target, input } = &reason {93			who_pays_fee = <T as pallet_evm::account::Config>::CrossAccountId::from_sub(T::EvmSponsorshipHandler::get_sponsor(&who.as_sub(), &(*target, input.clone()))94				.unwrap_or(who.as_sub().clone()));95		} else {96			who_pays_fee = who.clone();97		}9899		let negative_imbalance = EVMCurrencyAdapter::<<T as Config>::Currency, ()>::withdraw_fee(100			&who_pays_fee,101			reason,102			fee,103		)?;104105		Ok(negative_imbalance.map(|i| ChargeEvmLiquidityInfo {106			who: who_pays_fee.as_eth().clone(),107			negative_imbalance: i,108		}))109	}110111	fn correct_and_deposit_fee(112		who: &T::CrossAccountId,113		corrected_fee: U256,114		already_withdrawn: Self::LiquidityInfo,115	) {116		<EVMCurrencyAdapter<<T as Config>::Currency, ()> as pallet_evm::OnChargeEVMTransaction<T>>::correct_and_deposit_fee(117			&already_withdrawn.as_ref().map(|e| T::CrossAccountId::from_eth(e.who)).unwrap_or(who.clone()),118			corrected_fee,119			already_withdrawn.map(|e| e.negative_imbalance),120		)121	}122123	fn pay_priority_fee(tip: U256) {124		<EVMCurrencyAdapter<<T as Config>::Currency, ()> as pallet_evm::OnChargeEVMTransaction<T>>::pay_priority_fee(tip)125	}126}127128/// Implements sponsoring for evm calls performed from pallet-evm (via api.tx.ethereum.transact/api.tx.evm.call)129pub struct BridgeSponsorshipHandler<T>(PhantomData<T>);130impl<T, C> SponsorshipHandler<T::AccountId, C> for BridgeSponsorshipHandler<T>131where132	T: Config + pallet_evm::Config,133	C: IsSubType<pallet_evm::Call<T>>,134{135	fn get_sponsor(who: &T::AccountId, call: &C) -> Option<T::AccountId> {136		match call.is_sub_type()? {137			pallet_evm::Call::call {138				source,139				target,140				input,141				..142			} => {143				let _ = T::CallOrigin::ensure_address_origin(144					source,145					<frame_system::RawOrigin<T::AccountId>>::Signed(who.clone()).into(),146				)147				.ok()?;148				// Effects from EvmSponsorshipHandler are applied in OnChargeEvmTransaction by pallet_evm::runner149				// TODO: Should we implement simulation mode (test, but do not apply effects) in `up-sponsorship`?150				let sponsor = frame_support::storage::with_transaction(|| {151					TransactionOutcome::Rollback(T::EvmSponsorshipHandler::get_sponsor(152						&who,153						&(*target, input.clone()),154					))155				})?;156				Some(sponsor)157			}158			_ => None,159		}160	}161}