logrus.go

// formatter adds default fields to each log entry.  https://github.com/sirupsen/logrus/pull/653#issuecomment-454467900
type formatter struct {
	Fields logrus.Fields
	Lf     logrus.Formatter
}

// Format satisfies the logrus.Formatter interface.
func (f *formatter) Format(e *logrus.Entry) ([]byte, error) {
	for k, v := range f.Fields {
		e.Data[k] = v
	}

	return f.Lf.Format(e)
}


// Set logrus global logger

logrus.SetFormatter(&formatter{
  Fields: logrus.Fields{
    "facility": "myApp",
  },
  Lf: &logrus.JSONFormatter{
    FieldMap: logrus.FieldMap{
      logrus.FieldKeyMsg: "message",
    },
    TimestampFormat: time.RFC3339Nano,
  },
})

// logrus.AddHook(hook)

myLogger := logrus.StandardLogger()