git.delta.rocks / unique-network / refs/commits / c521d2f9a970

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//! ERC-20 standart support implementation.1819use core::char::{REPLACEMENT_CHARACTER, decode_utf16};20use core::convert::TryInto;21use evm_coder::{ToLog, execution::*, generate_stubgen, solidity_interface, types::*, weight};22use up_data_structs::CollectionMode;23use pallet_common::erc::{CommonEvmHandler, PrecompileResult};24use sp_std::vec::Vec;25use pallet_evm::{account::CrossAccountId, PrecompileHandle};26use pallet_evm_coder_substrate::{call, dispatch_to_evm};27use pallet_structure::{SelfWeightOf as StructureWeight, weights::WeightInfo as _};28use pallet_common::{CollectionHandle, erc::CollectionCall};2930use crate::{31	Allowance, Balance, Config, FungibleHandle, Pallet, SelfWeightOf, TotalSupply,32	weights::WeightInfo,33};3435#[derive(ToLog)]36pub enum ERC20Events {37	Transfer {38		#[indexed]39		from: address,40		#[indexed]41		to: address,42		value: uint256,43	},44	Approval {45		#[indexed]46		owner: address,47		#[indexed]48		spender: address,49		value: uint256,50	},51}5253#[solidity_interface(name = ERC20, events(ERC20Events))]54impl<T: Config> FungibleHandle<T> {55	fn name(&self) -> Result<string> {56		Ok(decode_utf16(self.name.iter().copied())57			.map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))58			.collect::<string>())59	}60	fn symbol(&self) -> Result<string> {61		Ok(string::from_utf8_lossy(&self.token_prefix).into())62	}63	fn total_supply(&self) -> Result<uint256> {64		self.consume_store_reads(1)?;65		Ok(<TotalSupply<T>>::get(self.id).into())66	}6768	fn decimals(&self) -> Result<uint8> {69		Ok(if let CollectionMode::Fungible(decimals) = &self.mode {70			*decimals71		} else {72			unreachable!()73		})74	}75	fn balance_of(&self, owner: address) -> Result<uint256> {76		self.consume_store_reads(1)?;77		let owner = T::CrossAccountId::from_eth(owner);78		let balance = <Balance<T>>::get((self.id, owner));79		Ok(balance.into())80	}81	#[weight(<SelfWeightOf<T>>::transfer())]82	fn transfer(&mut self, caller: caller, to: address, amount: uint256) -> Result<bool> {83		let caller = T::CrossAccountId::from_eth(caller);84		let to = T::CrossAccountId::from_eth(to);85		let amount = amount.try_into().map_err(|_| "amount overflow")?;86		let budget = self87			.recorder88			.weight_calls_budget(<StructureWeight<T>>::find_parent());8990		<Pallet<T>>::transfer(self, &caller, &to, amount, &budget).map_err(|_| "transfer error")?;91		Ok(true)92	}93	#[weight(<SelfWeightOf<T>>::transfer_from())]94	fn transfer_from(95		&mut self,96		caller: caller,97		from: address,98		to: address,99		amount: uint256,100	) -> Result<bool> {101		let caller = T::CrossAccountId::from_eth(caller);102		let from = T::CrossAccountId::from_eth(from);103		let to = T::CrossAccountId::from_eth(to);104		let amount = amount.try_into().map_err(|_| "amount overflow")?;105		let budget = self106			.recorder107			.weight_calls_budget(<StructureWeight<T>>::find_parent());108109		<Pallet<T>>::transfer_from(self, &caller, &from, &to, amount, &budget)110			.map_err(dispatch_to_evm::<T>)?;111		Ok(true)112	}113	#[weight(<SelfWeightOf<T>>::approve())]114	fn approve(&mut self, caller: caller, spender: address, amount: uint256) -> Result<bool> {115		let caller = T::CrossAccountId::from_eth(caller);116		let spender = T::CrossAccountId::from_eth(spender);117		let amount = amount.try_into().map_err(|_| "amount overflow")?;118119		<Pallet<T>>::set_allowance(self, &caller, &spender, amount)120			.map_err(dispatch_to_evm::<T>)?;121		Ok(true)122	}123	fn allowance(&self, owner: address, spender: address) -> Result<uint256> {124		self.consume_store_reads(1)?;125		let owner = T::CrossAccountId::from_eth(owner);126		let spender = T::CrossAccountId::from_eth(spender);127128		Ok(<Allowance<T>>::get((self.id, owner, spender)).into())129	}130}131132#[solidity_interface(name = ERC20Mintable)]133impl<T: Config> FungibleHandle<T> {134	/// Mint tokens for `to` account.135	/// @param to account that will receive minted tokens136	/// @param amount amount of tokens to mint137	#[weight(<SelfWeightOf<T>>::create_item())]138	fn mint(&mut self, caller: caller, to: address, amount: uint256) -> Result<bool> {139		let caller = T::CrossAccountId::from_eth(caller);140		let to = T::CrossAccountId::from_eth(to);141		let amount = amount.try_into().map_err(|_| "amount overflow")?;142		let budget = self143			.recorder144			.weight_calls_budget(<StructureWeight<T>>::find_parent());145		<Pallet<T>>::create_item(&self, &caller, (to, amount), &budget)146			.map_err(dispatch_to_evm::<T>)?;147		Ok(true)148	}149}150151#[solidity_interface(name = ERC20UniqueExtensions)]152impl<T: Config> FungibleHandle<T> {153	/// Burn tokens from account154	/// @dev Function that burns an `amount` of the tokens of a given account,155	/// deducting from the sender's allowance for said account.156	/// @param from The account whose tokens will be burnt.157	/// @param amount The amount that will be burnt.158	#[weight(<SelfWeightOf<T>>::burn_from())]159	fn burn_from(&mut self, caller: caller, from: address, amount: uint256) -> Result<bool> {160		let caller = T::CrossAccountId::from_eth(caller);161		let from = T::CrossAccountId::from_eth(from);162		let amount = amount.try_into().map_err(|_| "amount overflow")?;163		let budget = self164			.recorder165			.weight_calls_budget(<StructureWeight<T>>::find_parent());166167		<Pallet<T>>::burn_from(self, &caller, &from, amount, &budget)168			.map_err(dispatch_to_evm::<T>)?;169		Ok(true)170	}171172	/// Mint tokens for multiple accounts.173	/// @param amounts array of pairs of account address and amount174	#[weight(<SelfWeightOf<T>>::create_multiple_items_ex(amounts.len() as u32))]175	fn mint_bulk(&mut self, caller: caller, amounts: Vec<(address, uint256)>) -> Result<bool> {176		let caller = T::CrossAccountId::from_eth(caller);177		let budget = self178			.recorder179			.weight_calls_budget(<StructureWeight<T>>::find_parent());180		let amounts = amounts181			.into_iter()182			.map(|(to, amount)| {183				Ok((184					T::CrossAccountId::from_eth(to),185					amount.try_into().map_err(|_| "amount overflow")?,186				))187			})188			.collect::<Result<_>>()?;189190		<Pallet<T>>::create_multiple_items(&self, &caller, amounts, &budget)191			.map_err(dispatch_to_evm::<T>)?;192		Ok(true)193	}194}195196#[solidity_interface(197	name = UniqueFungible,198	is(199		ERC20,200		ERC20Mintable,201		ERC20UniqueExtensions,202		Collection(via(common_mut returns CollectionHandle<T>)),203	)204)]205impl<T: Config> FungibleHandle<T> where T::AccountId: From<[u8; 32]> + AsRef<[u8; 32]> {}206207generate_stubgen!(gen_impl, UniqueFungibleCall<()>, true);208generate_stubgen!(gen_iface, UniqueFungibleCall<()>, false);209210impl<T: Config> CommonEvmHandler for FungibleHandle<T>211where212	T::AccountId: From<[u8; 32]> + AsRef<[u8; 32]>,213{214	const CODE: &'static [u8] = include_bytes!("./stubs/UniqueFungible.raw");215216	fn call(self, handle: &mut impl PrecompileHandle) -> Option<PrecompileResult> {217		call::<T, UniqueFungibleCall<T>, _, _>(handle, self)218	}219}