golang中常见的logrus日志库

log.WithFields(log.Fields{
 "event": event,
 "topic": topic,
 "key": key,
}).Fatal("Failed to send event")

logf, err := rotatelogs.New(
  	cfg.Log.LogDir+logName+".%Y%m%d%H%M",
  	rotatelogs.WithLinkName(cfg.Log.LogDir+logName),
  	rotatelogs.WithMaxAge(24*time.Hour),
  	rotatelogs.WithRotationTime(time.Hour),
  )
  if err != nil {
  	stdLog.Printf("failed to create rotatelogs: %s", err)
  	return
  }

11:44:44.827 WARN [93ef3E0120160803114444] [main] [ClassPathXmlApplicationContext] Exception encountered during context initialization - cancelling refresh attempt

log.SetFormatter(&nested.Formatter{ // 嵌套日志兼容skynet日志格式
		HideKeys:        true,
		FieldsOrder:     []string{"region", "node", "topic"},
		TimestampFormat: "2006-01-02 15:04:05.000", // 显示ms
	})

type Hook interface {
	Levels() []Level
	Fire(*Entry) error
}

type FixedFieldHook struct {
	LogLevels  []logrus.Level
	FixedField map[string]string
}

// Fire will be called when some logging function is called with current hook
// It will format log entry to string and write it to appropriate writer
func (hook *FixedFieldHook) Fire(entry *logrus.Entry) error {
	for k, v := range hook.FixedField {
		entry.Data[k] = v
	}
	return nil
}

log.AddHook(&FixedFieldHook{ // Set fixed field
		FixedField: map[string]string{"region": cfg.LocalRegion, "node": ip},
		LogLevels: []logrus.Level{
			logrus.InfoLevel,
			logrus.ErrorLevel,
			logrus.WarnLevel,
			logrus.FatalLevel,
		},
	})