0fda25e471
Fixes the CaptureStart api to include the EVM, thus being able to set the statedb early on. This pr also exposes the struct we used internally in the interpreter to encapsulate the contract, mem, stack, rstack, so we pass it as a single struct to the tracer, and removes the error returns on the capture methods.
95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
// Copyright 2017 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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"encoding/json"
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"io"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/math"
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)
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type JSONLogger struct {
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encoder *json.Encoder
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cfg *LogConfig
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}
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// NewJSONLogger creates a new EVM tracer that prints execution steps as JSON objects
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// into the provided stream.
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func NewJSONLogger(cfg *LogConfig, writer io.Writer) *JSONLogger {
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l := &JSONLogger{json.NewEncoder(writer), cfg}
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if l.cfg == nil {
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l.cfg = &LogConfig{}
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}
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return l
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}
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func (l *JSONLogger) CaptureStart(env *EVM, from, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
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}
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func (l *JSONLogger) CaptureFault(*EVM, uint64, OpCode, uint64, uint64, *ScopeContext, int, error) {}
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// CaptureState outputs state information on the logger.
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func (l *JSONLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
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memory := scope.Memory
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stack := scope.Stack
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log := StructLog{
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Pc: pc,
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Op: op,
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Gas: gas,
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GasCost: cost,
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MemorySize: memory.Len(),
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Storage: nil,
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Depth: depth,
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RefundCounter: env.StateDB.GetRefund(),
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Err: err,
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}
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if !l.cfg.DisableMemory {
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log.Memory = memory.Data()
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}
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if !l.cfg.DisableStack {
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//TODO(@holiman) improve this
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logstack := make([]*big.Int, len(stack.Data()))
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for i, item := range stack.Data() {
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logstack[i] = item.ToBig()
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}
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log.Stack = logstack
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}
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if !l.cfg.DisableReturnData {
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log.ReturnData = rData
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}
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l.encoder.Encode(log)
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}
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// CaptureEnd is triggered at end of execution.
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func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
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type endLog struct {
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Output string `json:"output"`
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GasUsed math.HexOrDecimal64 `json:"gasUsed"`
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Time time.Duration `json:"time"`
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Err string `json:"error,omitempty"`
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}
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if err != nil {
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l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, err.Error()})
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}
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l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, ""})
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}
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