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// Copyright 2017 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 vm
import (
"encoding/json"
"io"
"math/big"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
)
type JSONLogger struct {
encoder *json.Encoder
cfg *LogConfig
}
// NewJSONLogger creates a new EVM tracer that prints execution steps as JSON objects
// into the provided stream.
func NewJSONLogger(cfg *LogConfig, writer io.Writer) *JSONLogger {
l := &JSONLogger{json.NewEncoder(writer), cfg}
if l.cfg == nil {
l.cfg = &LogConfig{}
}
return l
}
func (l *JSONLogger) CaptureStart(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error {
return nil
}
// CaptureState outputs state information on the logger.
func (l *JSONLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, rData []byte, contract *Contract, depth int, err error) error {
log := StructLog{
Pc: pc,
Op: op,
Gas: gas,
GasCost: cost,
MemorySize: memory.Len(),
Storage: nil,
Depth: depth,
RefundCounter: env.StateDB.GetRefund(),
Err: err,
}
if !l.cfg.DisableMemory {
log.Memory = memory.Data()
}
if !l.cfg.DisableStack {
//TODO(@holiman) improve this
logstack := make([]*big.Int, len(stack.Data()))
for i, item := range stack.Data() {
logstack[i] = item.ToBig()
}
log.Stack = logstack
log.ReturnStack = rStack.data
}
if !l.cfg.DisableReturnData {
log.ReturnData = rData
}
return l.encoder.Encode(log)
}
// CaptureFault outputs state information on the logger.
func (l *JSONLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, contract *Contract, depth int, err error) error {
return nil
}
// CaptureEnd is triggered at end of execution.
func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) error {
type endLog struct {
Output string `json:"output"`
GasUsed math.HexOrDecimal64 `json:"gasUsed"`
Time time.Duration `json:"time"`
Err string `json:"error,omitempty"`
}
if err != nil {
return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, err.Error()})
}
return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, ""})
}