Add JsonLogger type

eth/backend.go

@@ -44,6 +44,7 @@ type Config struct {
 }
 
 var logger = ethlogger.NewLogger("SERV")
+var jsonlogger = ethlogger.NewJsonLogger()
 
 type Ethereum struct {
 	// Channel for shutting down the ethereum
@@ -221,6 +222,14 @@ func (s *Ethereum) MaxPeers() int {
 
 // Start the ethereum
 func (s *Ethereum) Start(seed bool) error {
+	evd := map[string]interface{}{
+		"version_string": s.ClientIdentity().String(),
+		"guid":           ethutil.Bytes2Hex(s.ClientIdentity().Pubkey()),
+		"level":          "debug",
+		"coinbase":       ethutil.Bytes2Hex(s.KeyManager().Address()),
+		"eth_version":    ProtocolVersion,
+	}
+	jsonlogger.Log("starting", evd)
 	err := s.net.Start()
 	if err != nil {
 		return err

logger/loggers.go

@@ -13,8 +13,10 @@ logging of mutable state.
 package logger
 
 import (
+	"encoding/json"
 	"fmt"
 	"os"
+	"time"
 )
 
 type LogLevel uint32
@@ -112,3 +114,27 @@ func (logger *Logger) Fatalf(format string, v ...interface{}) {
 	Flush()
 	os.Exit(0)
 }
+
+type JsonLogger struct{}
+
+func NewJsonLogger() *JsonLogger {
+	return &JsonLogger{}
+}
+
+func (logger *JsonLogger) Log(msgname string, dict map[string]interface{}) {
+	if _, ok := dict["ts"]; !ok {
+		dict["ts"] = time.Now().Local().Format(time.RFC3339Nano)
+	}
+
+	// FIX
+	if _, ok := dict["level"]; !ok {
+		dict["level"] = "debug"
+	}
+
+	obj := map[string]interface{}{
+		msgname: dict,
+	}
+
+	jsontxt, _ := json.Marshal(obj)
+	logMessageC <- message{JsonLevel, fmt.Sprintf("%s", jsontxt)}
+}