package main

import (

	"os"

	"errors"

	"math/rand"

	"time"

	"log"

	"strconv"

)

func init() {

	rand.Seed(time.Now().Unix())

	file := "/www/logs/test.log";

	logFile, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0766)

	if err != nil {

		panic(err)

	}

	log.SetOutput(logFile) // 将文件设置为log输出的文件

	log.SetPrefix("[elk-test]")

	log.SetFlags(log.LstdFlags | log.Lshortfile | log.LUTC)

}

func main() {

	for {

		go func() {

			strs := []string{"浏览页面", "评论商品", "加入收藏", "加入购物车", "提交订单", "使用优惠券", "领取优惠券", "搜索", "查看订单"}

			a, _ := Random(strs, 1)

			now := time.Now()

			date := now.Format("2006-01-02 15:04:05")

			userId := rand.Intn(10000)

			result := "brady|" +strconv.Itoa(userId+1) + "|" + a + "|" + date;

			log.Println(result) // log 还是可以作为输出的前缀

		}()

		time.Sleep(1*time.Second)

	}

}

func Random(strings []string, length int) (string, error) {

	if len(strings) <= 0 {

		return "", errors.New("the length of the parameter strings should not be less than 0")

	}

	if length <= 0 || len(strings) <= length {

		return "", errors.New("the size of the parameter length illegal")

	}

	for i := len(strings) - 1; i > 0; i-- {

		num := rand.Intn(i + 1)

		strings[i], strings[num] = strings[num], strings[i]

	}

	str := ""

	for i := 0; i < length; i++ {

		str += strings[i]

	}

	return str, nil

}