git.delta.rocks / unique-network / refs/commits / 335fdfbf30ef

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)]1819#[cfg(not(feature = "std"))]20extern crate alloc;21// #[cfg(feature = "runtime-benchmarks")]22// pub mod benchmarking;2324pub use pallet::*;2526#[frame_support::pallet]27pub mod pallet {28	#[cfg(not(feature = "std"))]29	use alloc::format;3031	use evm_coder::{32		ToLog,33		abi::{AbiReader, AbiWrite, AbiWriter},34		execution::{self, Result},35		types::{Msg, value},36	};37	use frame_support::{ensure, sp_runtime::ModuleError};38	use pallet_evm::{39		ExitError, ExitRevert, ExitSucceed, GasWeightMapping, PrecompileFailure, PrecompileOutput,40		PrecompileResult, runner::stack::MaybeMirroredLog,41	};42	use frame_system::ensure_signed;43	pub use frame_support::dispatch::DispatchResult;44	use pallet_ethereum::EthereumTransactionSender;45	use sp_std::cell::RefCell;46	use sp_std::vec::Vec;47	use sp_core::H160;48	use frame_support::{pallet_prelude::*, traits::PalletInfo};49	use frame_system::pallet_prelude::*;5051	/// DispatchError is opaque, but we need to somehow extract correct error in case of OutOfGas failure52	/// So we have this pallet, which defines OutOfGas error, and knews its own id to check if DispatchError53	/// is thrown because of it54	///55	/// These errors shouldn't end in extrinsic results, as they only used in evm execution path56	#[pallet::error]57	pub enum Error<T> {58		OutOfGas,59		OutOfFund,60	}6162	#[pallet::config]63	pub trait Config: frame_system::Config {64		type EthereumTransactionSender: pallet_ethereum::EthereumTransactionSender;65		type GasWeightMapping: pallet_evm::GasWeightMapping;66	}6768	#[pallet::pallet]69	pub struct Pallet<T>(_);7071	#[pallet::call]72	impl<T: Config> Pallet<T> {73		#[pallet::weight(0)]74		pub fn empty_call(origin: OriginFor<T>) -> DispatchResult {75			let _sender = ensure_signed(origin)?;76			Ok(())77		}78	}7980	// From instabul hardfork configuration: https://github.com/rust-blockchain/evm/blob/fd4fd6acc0ca3208d6770fdb3ba407c94cdf97c6/runtime/src/lib.rs#L28481	pub const G_SLOAD_WORD: u64 = 800;82	pub const G_SSTORE_WORD: u64 = 20000;8384	#[derive(Default)]85	pub struct SubstrateRecorder<T: Config> {86		contract: H160,87		logs: RefCell<Vec<MaybeMirroredLog>>,88		initial_gas: u64,89		gas_limit: RefCell<u64>,90		_phantom: PhantomData<*const T>,91	}9293	impl<T: Config> SubstrateRecorder<T> {94		pub fn new(contract: H160, gas_limit: u64) -> Self {95			Self {96				contract,97				logs: RefCell::new(Vec::new()),98				initial_gas: gas_limit,99				gas_limit: RefCell::new(gas_limit),100				_phantom: PhantomData,101			}102		}103104		pub fn is_empty(&self) -> bool {105			self.logs.borrow().is_empty()106		}107		// Logs emitted with log_direct appear as substrate evm.Log event108		pub fn log_direct(&self, log: impl ToLog) {109			self.logs110				.borrow_mut()111				.push(MaybeMirroredLog::direct(log.to_log(self.contract)))112		}113		/// If log already has substrate equivalent - then we don't need to emit evm.Log114		pub fn log_mirrored(&self, log: impl ToLog) {115			self.logs116				.borrow_mut()117				.push(MaybeMirroredLog::mirrored(log.to_log(self.contract)))118		}119		pub fn retrieve_logs(self) -> Vec<MaybeMirroredLog> {120			self.logs.into_inner()121		}122123		pub fn gas_left(&self) -> u64 {124			*self.gas_limit.borrow()125		}126		pub fn consume_sload_sub(&self) -> DispatchResult {127			self.consume_gas_sub(G_SLOAD_WORD)128		}129		pub fn consume_sstores_sub(&self, amount: usize) -> DispatchResult {130			self.consume_gas_sub(G_SSTORE_WORD.saturating_mul(amount as u64))131		}132		pub fn consume_sstore_sub(&self) -> DispatchResult {133			self.consume_gas_sub(G_SSTORE_WORD)134		}135		pub fn consume_gas_sub(&self, gas: u64) -> DispatchResult {136			ensure!(gas != u64::MAX, Error::<T>::OutOfGas);137			let mut gas_limit = self.gas_limit.borrow_mut();138			ensure!(gas <= *gas_limit, Error::<T>::OutOfGas);139			*gas_limit -= gas;140			Ok(())141		}142143		pub fn consume_sload(&self) -> Result<()> {144			self.consume_gas(G_SLOAD_WORD)145		}146		pub fn consume_sstore(&self) -> Result<()> {147			self.consume_gas(G_SSTORE_WORD)148		}149		pub fn consume_gas(&self, gas: u64) -> Result<()> {150			if gas == u64::MAX {151				return Err(execution::Error::Error(ExitError::OutOfGas));152			}153			let mut gas_limit = self.gas_limit.borrow_mut();154			if gas > *gas_limit {155				return Err(execution::Error::Error(ExitError::OutOfGas));156			}157			*gas_limit -= gas;158			Ok(())159		}160		pub fn return_gas(&self, gas: u64) {161			let mut gas_limit = self.gas_limit.borrow_mut();162			*gas_limit += gas;163		}164165		pub fn evm_to_precompile_output(166			self,167			result: evm_coder::execution::Result<Option<AbiWriter>>,168		) -> Option<PrecompileResult> {169			use evm_coder::execution::Error;170			Some(match result {171				Ok(Some(v)) => Ok(PrecompileOutput {172					exit_status: ExitSucceed::Returned,173					cost: self.initial_gas - self.gas_left(),174					// TODO: preserve mirroring status175					logs: self.retrieve_logs().into_iter().map(|l| l.log).collect(),176					output: v.finish(),177				}),178				Ok(None) => return None,179				Err(Error::Revert(e)) => {180					let mut writer = AbiWriter::new_call(evm_coder::fn_selector!(Error(string)));181					(&e as &str).abi_write(&mut writer);182183					Err(PrecompileFailure::Revert {184						exit_status: ExitRevert::Reverted,185						cost: self.initial_gas - self.gas_left(),186						output: writer.finish(),187					})188				}189				Err(Error::Fatal(f)) => Err(f.into()),190				Err(Error::Error(e)) => Err(e.into()),191			})192		}193194		pub fn submit_logs(self) {195			let logs = self.retrieve_logs();196			if logs.is_empty() {197				return;198			}199			T::EthereumTransactionSender::submit_logs_transaction(Default::default(), logs)200		}201	}202203	pub fn dispatch_to_evm<T: Config>(err: DispatchError) -> evm_coder::execution::Error {204		use evm_coder::execution::Error as ExError;205		match err {206			DispatchError::Module(ModuleError { index, error, .. })207				if index208					== T::PalletInfo::index::<Pallet<T>>()209						.expect("evm-coder-substrate is a pallet, which should be added to runtime")210						as u8 =>211			{212				let mut read = &error as &[u8];213				match Error::<T>::decode(&mut read) {214					Ok(Error::<T>::OutOfGas) => ExError::Error(ExitError::OutOfGas),215					Ok(Error::<T>::OutOfFund) => ExError::Error(ExitError::OutOfFund),216					_ => unreachable!("this pallet only defines two possible errors"),217				}218			}219			DispatchError::Module(ModuleError {220				message: Some(msg), ..221			}) => ExError::Revert(msg.into()),222			DispatchError::Module(ModuleError { index, error, .. }) => {223				ExError::Revert(format!("error {:?} in pallet {}", error, index))224			}225			e => ExError::Revert(format!("substrate error: {:?}", e)),226		}227	}228229	pub trait WithRecorder<T: Config> {230		fn recorder(&self) -> &SubstrateRecorder<T>;231		fn into_recorder(self) -> SubstrateRecorder<T>;232	}233234	/// Helper to simplify implementing bridge between evm-coder definitions and pallet-evm235	pub fn call<236		T: Config,237		C: evm_coder::Call + evm_coder::Weighted,238		E: evm_coder::Callable<C> + WithRecorder<T>,239	>(240		caller: H160,241		mut e: E,242		value: value,243		input: &[u8],244	) -> Option<PrecompileResult> {245		let result = call_internal(caller, &mut e, value, input);246		e.into_recorder().evm_to_precompile_output(result)247	}248249	fn call_internal<250		T: Config,251		C: evm_coder::Call + evm_coder::Weighted,252		E: evm_coder::Callable<C> + WithRecorder<T>,253	>(254		caller: H160,255		e: &mut E,256		value: value,257		input: &[u8],258	) -> evm_coder::execution::Result<Option<AbiWriter>> {259		let (selector, mut reader) = AbiReader::new_call(input)?;260		let call = C::parse(selector, &mut reader)?;261		if call.is_none() {262			return Ok(None);263		}264		let call = call.unwrap();265266		let dispatch_info = call.weight();267		e.recorder()268			.consume_gas(T::GasWeightMapping::weight_to_gas(dispatch_info.weight))?;269270		match e.call(Msg {271			call,272			caller,273			value,274		}) {275			Ok(v) => {276				let unspent = v.post_info.calc_unspent(&dispatch_info);277				e.recorder()278					.return_gas(T::GasWeightMapping::weight_to_gas(unspent));279				Ok(Some(v.data))280			}281			Err(v) => {282				let unspent = v.post_info.calc_unspent(&dispatch_info);283				e.recorder()284					.return_gas(T::GasWeightMapping::weight_to_gas(unspent));285				Err(v.data)286			}287		}288	}289}