Basic logging in Go

log.go

package main

import (
	"log"
	"os"
)

var (
	InfoLogger *log.Logger
	WarningLogger *log.Logger
	ErrorLogger *log.Logger
)

func init() {
	fp, err := os.OpenFile("logs.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
	if err != nil {
		log.Fatal(err)
	}
	InfoLogger = log.New(os.Stdout, "INFO: ", log.LstdFlags)
	WarningLogger = log.New(fp, "WARNING: ", log.LstdFlags|log.Lshortfile)
	ErrorLogger = log.New(fp, "ERROR: ", log.LstdFlags|log.Lshortfile)
}

func main() {
	log.SetFlags(log.LstdFlags | log.Lshortfile)
	log.Println("Hey!")
	log.SetOutput(os.Stdout)
	log.Println("Hey again!")

	InfoLogger.Println("This is some info")
	WarningLogger.Println("This is something serious")
	ErrorLogger.Println("Something bad happened")
}