Is there a GoLang logger that allows logging in different formats to the console as well as a log file [closed]

Question

I come from a node.js background and am comfortable with a number of loggers (such as winston) that allow configurable formatted output to multiple sources such as the console as well as a log file, where the outputs to each may be formatted differently.

I am attempting to do something similar with GoLang and have had difficulty finding a logging package that supports this capability.

Is there a GoLang package that I could use to achieve this outcome?

Answer 1

logrus is already mentioned here and it can give you exactly what you need using hooks. Hooks can send the log to different destinations, using different formats. You can find a list of hooks in the documentation like for sending logs to InfluxDB or Logstash. You can even implement your own hook based on your needs.

Answer 2

Below is an example of achieving this with Sirupsen/logrus

package main

import (
  "github.com/Sirupsen/logrus"
  "os"
)

// Create a new instance of the logger. You can have any number of instances.
var log1 = logrus.New()
var log2 = logrus.New()

func main() {
  // The API for setting attributes is a little different than the package level
  // exported logger. See Godoc.
  log1.Out = os.Stderr
  log1.Formatter = &logrus.TextFormatter{}

  LogOutputFile, err := os.OpenFile("out.log", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
  if err != nil {
    logrus.Fatalf("error opening file: %v", err) 
  }  

  log2.Out = LogOutputFile
  log2.Formatter = &logrus.JSONFormatter{}

  log1.WithFields(logrus.Fields{
    "animal": "walrus",
    "size":   10,
  }).Info("A group of walrus emerges from the ocean")

  log2.WithFields(logrus.Fields{
    "animal": "walrus",
    "size":   10,
  }).Info("A group of walrus emerges from the ocean")

}