b1f6dccfba
This PR simplifies the logic of chain tracer and also adds the unit tests. The most important change has been made in this PR is the state management. Whenever a tracing state is acquired there is a corresponding release function be returned as well. It must be called once the state is used up, otherwise resource leaking can happen. And also the logic of state management has been simplified a lot. Specifically, the state provider(eth backend, les backend) should ensure the state is available and referenced. State customers can use the state according to their own needs, or build other states based on the given state. But once the release function is called, there is no guarantee of the availability of the state. Co-authored-by: Sina Mahmoodi <1591639+s1na@users.noreply.github.com> Co-authored-by: Péter Szilágyi <peterke@gmail.com>
81 lines
3.6 KiB
Go
81 lines
3.6 KiB
Go
// Copyright 2021 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package les
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/ethereum/go-ethereum/core"
|
|
"github.com/ethereum/go-ethereum/core/state"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/core/vm"
|
|
"github.com/ethereum/go-ethereum/eth/tracers"
|
|
"github.com/ethereum/go-ethereum/light"
|
|
)
|
|
|
|
// noopReleaser is returned in case there is no operation expected
|
|
// for releasing state.
|
|
var noopReleaser = tracers.StateReleaseFunc(func() {})
|
|
|
|
// stateAtBlock retrieves the state database associated with a certain block.
|
|
func (leth *LightEthereum) stateAtBlock(ctx context.Context, block *types.Block, reexec uint64) (*state.StateDB, tracers.StateReleaseFunc, error) {
|
|
return light.NewState(ctx, block.Header(), leth.odr), noopReleaser, nil
|
|
}
|
|
|
|
// stateAtTransaction returns the execution environment of a certain transaction.
|
|
func (leth *LightEthereum) stateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, tracers.StateReleaseFunc, error) {
|
|
// Short circuit if it's genesis block.
|
|
if block.NumberU64() == 0 {
|
|
return nil, vm.BlockContext{}, nil, nil, errors.New("no transaction in genesis")
|
|
}
|
|
// Create the parent state database
|
|
parent, err := leth.blockchain.GetBlock(ctx, block.ParentHash(), block.NumberU64()-1)
|
|
if err != nil {
|
|
return nil, vm.BlockContext{}, nil, nil, err
|
|
}
|
|
statedb, release, err := leth.stateAtBlock(ctx, parent, reexec)
|
|
if err != nil {
|
|
return nil, vm.BlockContext{}, nil, nil, err
|
|
}
|
|
if txIndex == 0 && len(block.Transactions()) == 0 {
|
|
return nil, vm.BlockContext{}, statedb, release, nil
|
|
}
|
|
// Recompute transactions up to the target index.
|
|
signer := types.MakeSigner(leth.blockchain.Config(), block.Number())
|
|
for idx, tx := range block.Transactions() {
|
|
// Assemble the transaction call message and return if the requested offset
|
|
msg, _ := tx.AsMessage(signer, block.BaseFee())
|
|
txContext := core.NewEVMTxContext(msg)
|
|
context := core.NewEVMBlockContext(block.Header(), leth.blockchain, nil)
|
|
statedb.Prepare(tx.Hash(), idx)
|
|
if idx == txIndex {
|
|
return msg, context, statedb, release, nil
|
|
}
|
|
// Not yet the searched for transaction, execute on top of the current state
|
|
vmenv := vm.NewEVM(context, txContext, statedb, leth.blockchain.Config(), vm.Config{})
|
|
if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas())); err != nil {
|
|
return nil, vm.BlockContext{}, nil, nil, fmt.Errorf("transaction %#x failed: %v", tx.Hash(), err)
|
|
}
|
|
// Ensure any modifications are committed to the state
|
|
// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
|
|
statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
|
|
}
|
|
return nil, vm.BlockContext{}, nil, nil, fmt.Errorf("transaction index %d out of range for block %#x", txIndex, block.Hash())
|
|
}
|