mirror of
https://github.com/ethereum/go-ethereum.git
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137 lines
3.9 KiB
Go
137 lines
3.9 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"context"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/ethclient"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/params"
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)
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// l1Call implemented as a native contract. it executes read-only code from
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// an L1 Contract in the context of the L1 contract.
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type l1Call struct{}
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// RequiredGas returns the gas required to execute the pre-compiled contract.
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func (c *l1Call) RequiredGas(input []byte) uint64 {
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return params.L1Call
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}
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// Run implements
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// solidity call such as:
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// l1call(abi.encodePacked(address(contractAddress), abiEncodedData))
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func (c *l1Call) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
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r, err := rpc.Dial(opts.L1RPCUrl)
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if err != nil {
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return nil, err
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}
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client := ethclient.NewClient(r)
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// get first 32 bytes which should be the address of the contract
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addr := common.BytesToAddress(input[:32])
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// rest of bytes should be msg data
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msgData := input[64:]
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// use latest blockNumber for now?
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// call contract, get the response, but dont execute it on L1.
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contractResponse, err := client.CallContract(
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context.Background(),
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ethereum.CallMsg{
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To: &addr,
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Data: msgData,
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},
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nil,
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)
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if err != nil {
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return nil, err
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}
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return contractResponse, nil
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}
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// l1DelegateCall implemented as a native contract.
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// it executes read-only code from an L1 contract in the context of the L2
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// calling contract.
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type l1DelegateCall struct{}
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// RequiredGas returns the gas required to execute the pre-compiled contract.
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func (c *l1DelegateCall) RequiredGas(input []byte) uint64 {
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return params.L1DelegateCall
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}
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// Run implements
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// solidity call such as:
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// l1delegetecall(abi.encodePacked(address(contractAddress), abiEncodedData))
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// defaults to latest block. TODO: get latest block synced from
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// TaikoL2 contract, dont allow usage of L1 blocks that havent been
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// synced to L2.
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func (c *l1DelegateCall) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
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snapshot := opts.StateDB.Snapshot()
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defer func() {
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opts.StateDB.RevertToSnapshot(snapshot)
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}()
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// add the L1 bytecode gotten below to this stateDB, then execute contract, then REVERT.
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r, err := rpc.Dial(opts.L1RPCUrl)
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if err != nil {
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return nil, err
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}
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client := ethclient.NewClient(r)
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// get first 32 bytes which should be the address of the contract
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addr := common.BytesToAddress(input[:32])
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// rest of bytes should be msg data
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msgData := input[32:]
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// use latest blockNumber for now?
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// call contract, get the response, but dont execute it on L1.
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l1ContractBytecode, err := client.CodeAt(
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context.Background(),
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addr,
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nil,
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)
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// load this bytecode in at an address, and execute the rest of this msg.data
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// at that address.
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if err != nil {
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return nil, err
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}
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// overwrite L2 contract with the L1 contract, at the same address.
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// it will be reverted after
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contract := NewContract(opts.Caller, AccountRef(addr), nil, 0)
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contract.SetCallCode(&addr, opts.StateDB.GetCodeHash(addr), l1ContractBytecode)
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ret, err := opts.Interpreter.Run(contract, msgData, false)
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if err != nil {
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return nil, err
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}
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return ret, nil
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}
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