From 42a914a84ffcc5d123af400c2cbcd34b05e2b0b3 Mon Sep 17 00:00:00 2001
From: Martin Holst Swende <martin@swende.se>
Date: Mon, 15 Oct 2018 12:28:44 +0200
Subject: cmd/evm, core/vm, eth: implement api methods to do stdjson dump to
local filesystem
---
core/vm/logger_json.go | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)
create mode 100644 core/vm/logger_json.go
(limited to 'core')
diff --git a/core/vm/logger_json.go b/core/vm/logger_json.go
new file mode 100644
index 000000000..ac3c40759
--- /dev/null
+++ b/core/vm/logger_json.go
@@ -0,0 +1,83 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. 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 {
+ return &JSONLogger{json.NewEncoder(writer), cfg}
+}
+
+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, 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 {
+ log.Stack = stack.Data()
+ }
+ 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, 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, ""})
+}
--
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