github.com/clem109/go-ethereum@v1.8.3-0.20180316121352-fe6cf00f480a/cmd/evm/json_logger.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"encoding/json"
    21  	"io"
    22  	"math/big"
    23  	"time"
    24  
    25  	"github.com/ethereum/go-ethereum/common"
    26  	"github.com/ethereum/go-ethereum/common/math"
    27  	"github.com/ethereum/go-ethereum/core/vm"
    28  )
    29  
    30  type JSONLogger struct {
    31  	encoder *json.Encoder
    32  	cfg     *vm.LogConfig
    33  }
    34  
    35  func NewJSONLogger(cfg *vm.LogConfig, writer io.Writer) *JSONLogger {
    36  	return &JSONLogger{json.NewEncoder(writer), cfg}
    37  }
    38  
    39  func (l *JSONLogger) CaptureStart(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error {
    40  	return nil
    41  }
    42  
    43  // CaptureState outputs state information on the logger.
    44  func (l *JSONLogger) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) error {
    45  	log := vm.StructLog{
    46  		Pc:         pc,
    47  		Op:         op,
    48  		Gas:        gas,
    49  		GasCost:    cost,
    50  		MemorySize: memory.Len(),
    51  		Storage:    nil,
    52  		Depth:      depth,
    53  		Err:        err,
    54  	}
    55  	if !l.cfg.DisableMemory {
    56  		log.Memory = memory.Data()
    57  	}
    58  	if !l.cfg.DisableStack {
    59  		log.Stack = stack.Data()
    60  	}
    61  	return l.encoder.Encode(log)
    62  }
    63  
    64  // CaptureFault outputs state information on the logger.
    65  func (l *JSONLogger) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) error {
    66  	return nil
    67  }
    68  
    69  // CaptureEnd is triggered at end of execution.
    70  func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) error {
    71  	type endLog struct {
    72  		Output  string              `json:"output"`
    73  		GasUsed math.HexOrDecimal64 `json:"gasUsed"`
    74  		Time    time.Duration       `json:"time"`
    75  		Err     string              `json:"error,omitempty"`
    76  	}
    77  	if err != nil {
    78  		return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, err.Error()})
    79  	}
    80  	return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, ""})
    81  }