zerolog output to different file by level error

main.go

package main

import (
	"fmt"
	"io"
	"os"
	"time"

	"github.com/rs/zerolog"
)

type SpecificLevelWriter struct {
	io.Writer
	Levels []zerolog.Level
}

func (w SpecificLevelWriter) WriteLevel(level zerolog.Level, p []byte) (int, error) {
	for _, l := range w.Levels {
		if l == level {
			return w.Write(p)
		}
	}
	return len(p), nil
}

func CreateLogger() zerolog.Logger {
	ifile, _ := os.OpenFile(fmt.Sprintf("%s-info.log", time.Now().Format("2006-01-02")), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
	efile, _ := os.OpenFile(fmt.Sprintf("%s-error.log", time.Now().Format("2006-01-02")), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)

	writer := zerolog.MultiLevelWriter(
		SpecificLevelWriter{
			Writer: ifile,
			Levels: []zerolog.Level{
				zerolog.DebugLevel, zerolog.InfoLevel, zerolog.WarnLevel,
			},
		},
		SpecificLevelWriter{
			Writer: efile,
			Levels: []zerolog.Level{
				zerolog.ErrorLevel, zerolog.FatalLevel, zerolog.PanicLevel,
			},
		},
	)

	return zerolog.New(writer).With().Timestamp().Logger()
}

func main() {
	l := CreateLogger()
	l.Debug().Msg("debugnya masuk ke info.log")
	l.Info().Msg("infonya masuk ke info.log")
	l.Error().Msg("error masuk ke error.log")
	l.Fatal().Msg("fatal masuk ke error.log")
}