Logging

package main
 
import (
    "log"
    "os"
)
 
var (
    WarningLogger *log.Logger
    InfoLogger    *log.Logger
    ErrorLogger   *log.Logger
)
 
func init() {
    file, err := os.OpenFile("logs.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
    if err != nil {
        log.Fatal(err)
    }
 
    InfoLogger = log.New(file, "INFO: ", log.Ldate|log.Ltime|log.Lshortfile)
    WarningLogger = log.New(file, "WARNING: ", log.Ldate|log.Ltime|log.Lshortfile)
    ErrorLogger = log.New(file, "ERROR: ", log.Ldate|log.Ltime|log.Lshortfile)
}
 
func main() {
    InfoLogger.Println("Starting the application...")
    InfoLogger.Println("Something noteworthy happened")
    WarningLogger.Println("There is something you should know about")
    ErrorLogger.Println("Something went wrong")
}

When you run this program, the following will be written to *logs.txt*.

INFO: 2019/12/09 12:01:06 main.go:26: Starting the application...
INFO: 2019/12/09 12:01:06 main.go:27: Something noteworthy happened
WARNING: 2019/12/09 12:01:06 main.go:28: There is something you should know about
ERROR: 2019/12/09 12:01:06 main.go:29: Something went wrong

https://www.honeybadger.io/blog/golang-logging/

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