package logger

import (
	"fmt"
	"io"
	"log"
	"math"
	"os"
	"time"

	"gopkg.in/natefinch/lumberjack.v2"
)

func newRollingWriter() io.Writer {
	if err := os.MkdirAll("log", 0744); err != nil {
		log.Println("不能创建用于保存日志的目录。")
		return nil
	}

	now := time.Now()
	return &lumberjack.Logger{
		Filename:   fmt.Sprintf("log/service_%s.log", now.Format("2006-01-02_15")),
		MaxBackups: math.MaxInt, // files
		MaxSize:    200,         // megabytes
		MaxAge:     math.MaxInt, // days
	}
}