I want to generate four log files for warning, debug, error, and info. I want to control which file should be print at run time

package Loggers

import (
	"io"
	"os"
	"log"
)

var logCloser io.Closer
func MyLogger() {
	logFile, err := os.OpenFile("C:/Git/goclassec/src/gclassec/Logs/log.txt", os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666)
	if err != nil {
		panic(err)
	}
	logCloser = logFile
	log.SetOutput(logFile)
}
func CloseMyLogger() {
	logCloser.Close()
}

You can use log.New to create different loggers and wrap it inside your MyLogger

This is the New format

 New(out io.Writer, prefix string, flag int)

Here is a sample implementation

Code

package loggers
import (
"log"
"os"
)
//MyLogger custom logger
type MyLogger struct {
ErrorL *log.Logger
InfoL  *log.Logger
DebugL *log.Logger
}
//New returns logger
//TODO : deal with error
func New() *MyLogger {
ml := new(MyLogger)
if logFile, err := os.OpenFile("C:/Git/goclassec/src/gclassec/Logs/log_error.txt", os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666); err == nil {
ml.ErrorL = log.New(logFile, "ERROR", log.LUTC)
}
if logFile, err := os.OpenFile("C:/Git/goclassec/src/gclassec/Logs/log_info.txt", os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666); err == nil {
ml.InfoL = log.New(logFile, "INFO", log.LUTC)
}
if logFile, err := os.OpenFile("C:/Git/goclassec/src/gclassec/Logs/log_debug.txt", os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666); err == nil {
ml.DebugL = log.New(logFile, "DEBUG", log.LUTC)
}
return ml
}
func (ml MyLogger) Error(data ...interface{}) {
ml.ErrorL.Println(data...)
}
func (ml MyLogger) Info(data ...interface{}) {
ml.InfoL.Println(data...)
}
func (ml MyLogger) Debug(data ...interface{}) {
ml.DebugL.Println(data...)
}

Usage

logger := loggers.New()
logger.Error("Error occured",err)
logger.Info("Doing","something","again","blah")