git.delta.rocks / unique-network / refs/commits / d191478d543b

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::{EnsureAddressOrigin, account::CrossAccountId};24use sp_core::H160;25use sp_runtime::{TransactionOutcome, DispatchError};26use up_sponsorship::SponsorshipHandler;2728#[frame_support::pallet]29pub mod pallet {30	use super::*;3132	use frame_support::traits::Currency;33	use sp_std::vec::Vec;3435	#[pallet::config]36	pub trait Config: frame_system::Config + pallet_evm::account::Config {37		type EvmSponsorshipHandler: SponsorshipHandler<Self::CrossAccountId, (H160, Vec<u8>)>;38		type Currency: Currency<Self::AccountId>;39	}4041	#[pallet::pallet]42	#[pallet::generate_store(pub(super) trait Store)]43	pub struct Pallet<T>(_);44}4546pub struct TransactionValidityHack<T: Config>(PhantomData<*const T>);47impl<T: Config> fp_evm::TransactionValidityHack<T::CrossAccountId> for TransactionValidityHack<T> {48	fn who_pays_fee(origin: H160, reason: &WithdrawReason) -> Option<T::CrossAccountId> {49		match reason {50			WithdrawReason::Call { target, input } => {51				let origin_sub = T::CrossAccountId::from_eth(origin);52				T::EvmSponsorshipHandler::get_sponsor(&origin_sub, &(*target, input.clone()))53			}54			_ => None,55		}56	}57}5859/// Implements sponsoring for evm calls performed from pallet-evm (via api.tx.ethereum.transact/api.tx.evm.call)60pub struct BridgeSponsorshipHandler<T>(PhantomData<T>);61impl<T, C> SponsorshipHandler<T::AccountId, C> for BridgeSponsorshipHandler<T>62where63	T: Config + pallet_evm::Config,64	C: IsSubType<pallet_evm::Call<T>>,65{66	fn get_sponsor(who: &T::AccountId, call: &C) -> Option<T::AccountId> {67		match call.is_sub_type()? {68			pallet_evm::Call::call {69				source,70				target,71				input,72				..73			} => {74				let _ = T::CallOrigin::ensure_address_origin(75					source,76					<frame_system::RawOrigin<T::AccountId>>::Signed(who.clone()).into(),77				)78				.ok()?;79				let who = T::CrossAccountId::from_sub(who.clone());80				// Effects from EvmSponsorshipHandler are applied by pallet_evm::runner81				// TODO: Should we implement simulation mode (test, but do not apply effects) in `up-sponsorship`?82				let sponsor = frame_support::storage::with_transaction(|| {83					TransactionOutcome::Rollback(Ok::<_, DispatchError>(84						T::EvmSponsorshipHandler::get_sponsor(&who, &(*target, input.clone())),85					))86				})87				// FIXME: it may fail with DispatchError in case of depth limit88				.ok()??;89				Some(sponsor.as_sub().clone())90			}91			_ => None,92		}93	}94}