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feat: move erc20 transfer to its own shared crate
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| [package] | ||
| name = "evm-erc20-utils" | ||
| authors = { workspace = true } | ||
| description = "A Package containing ERC20 utility functions for EVM precompiles." | ||
| edition = { workspace = true } | ||
| version = "0.1.0" | ||
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| [dependencies] | ||
| ethabi = { workspace = true } | ||
| hex = { workspace = true, default-features = false } | ||
| precompile-utils = { workspace = true } | ||
| log = { workspace = true, default-features = false } | ||
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| # Substrate | ||
| sp-core = { workspace = true } | ||
| sp-std = { workspace = true } | ||
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| # Frontier | ||
| fp-evm = { workspace = true } | ||
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| [dev-dependencies] | ||
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| [features] | ||
| default = ["std"] | ||
| std = ["ethabi/std", "hex/std", "fp-evm/std", "precompile-utils/std", "sp-core/std", "sp-std/std"] |
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| Original file line number | Diff line number | Diff line change |
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| // This file is part of Tangle. | ||
| // Copyright (C) 2022-2024 Tangle Foundation. | ||
| // | ||
| // This file is part of pallet-evm-precompile-multi-asset-delegation package. | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #![cfg_attr(not(feature = "std"), no_std)] | ||
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| #[cfg(not(feature = "std"))] | ||
| extern crate alloc; | ||
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| use ethabi::Function; | ||
| use fp_evm::PrecompileFailure; | ||
| use precompile_utils::prelude::*; | ||
| use sp_core::U256; | ||
| use sp_std::prelude::*; | ||
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| #[cfg(not(feature = "std"))] | ||
| use alloc::format; | ||
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| /// Executes an ERC20 token transfer by calling the `transfer` function on the specified ERC20 contract | ||
| /// | ||
| /// # Arguments | ||
| /// | ||
| /// * `handle` - Handle for the precompile execution context | ||
| /// * `erc20` - Address of the ERC20 token contract | ||
| /// * `to` - Destination address to transfer tokens to | ||
| /// * `amount` - Amount of tokens to transfer | ||
| /// | ||
| /// # Returns | ||
| /// | ||
| /// * `Ok(bool)` - Returns true if transfer succeeded, false otherwise | ||
| /// * `Err(PrecompileFailure)` - If the transfer call fails or returns invalid data | ||
| pub fn erc20_transfer( | ||
| handle: &mut impl PrecompileHandle, | ||
| erc20: Address, | ||
| to: Address, | ||
| amount: U256, | ||
| ) -> EvmResult<bool> { | ||
| #[allow(deprecated)] | ||
| let transfer_fn = Function { | ||
| name: String::from("transfer"), | ||
| inputs: Vec::from([ | ||
| ethabi::Param { | ||
| name: String::from("to"), | ||
| kind: ethabi::ParamType::Address, | ||
| internal_type: None, | ||
| }, | ||
| ethabi::Param { | ||
| name: String::from("value"), | ||
| kind: ethabi::ParamType::Uint(256), | ||
| internal_type: None, | ||
| }, | ||
| ]), | ||
| outputs: Vec::from([ethabi::Param { | ||
| name: String::from("success"), | ||
| kind: ethabi::ParamType::Bool, | ||
| internal_type: None, | ||
| }]), | ||
| constant: None, | ||
| state_mutability: ethabi::StateMutability::NonPayable, | ||
| }; | ||
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| let args = [ethabi::Token::Address(to.0), ethabi::Token::Uint(ethabi::Uint::from(amount))]; | ||
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| let data = transfer_fn | ||
| .encode_input(&args) | ||
| .map_err(|e| revert(format!("failed to encode IERC20.transfer call: {e:?}")))?; | ||
| // let gas_limit = Some(handle.remaining_gas()); | ||
| let gas_limit = None; | ||
| let is_static = false; | ||
| let caller = handle.context().caller; | ||
| let context = fp_evm::Context { address: erc20.0, caller, apparent_value: U256::zero() }; | ||
| let (exit_reason, output) = handle.call(erc20.0, None, data, gas_limit, is_static, &context); | ||
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| log::debug!( | ||
| target: "evm", | ||
| "erc20_transfer: context: {:?}, exit_reason: {:?}, input: ({:?}, {}), output: 0x{}", | ||
| context, | ||
| exit_reason, | ||
| to.0, | ||
| amount, | ||
| hex::encode(&output), | ||
| ); | ||
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| match exit_reason { | ||
| fp_evm::ExitReason::Succeed(_) => { | ||
| // decode the result and return it | ||
| let result = transfer_fn | ||
| .decode_output(&output) | ||
| .map_err(|e| revert(format!("failed to decode IERC20.transfer result: {e:?}")))?; | ||
| let first_token = result.first().ok_or(RevertReason::custom("no return value"))?; | ||
| let s = if let ethabi::Token::Bool(val) = first_token { *val } else { false }; | ||
| Ok(s) | ||
| }, | ||
| fp_evm::ExitReason::Error(e) => Err(PrecompileFailure::Error { exit_status: e }), | ||
| fp_evm::ExitReason::Revert(e) => Err(PrecompileFailure::Revert { exit_status: e, output }), | ||
| fp_evm::ExitReason::Fatal(e) => Err(PrecompileFailure::Fatal { exit_status: e }), | ||
| } | ||
| } |
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