96 lines
3.1 KiB
Go
96 lines
3.1 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(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error {
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return nil
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}
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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, memory *Memory, stack *Stack, rData []byte, contract *Contract, depth int, err error) error {
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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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return l.encoder.Encode(log)
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}
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// CaptureFault outputs state information on the logger.
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func (l *JSONLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, contract *Contract, depth int, err error) error {
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return nil
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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) 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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return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, err.Error()})
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}
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return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, ""})
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}
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