package main

import (
	"fmt"
	"github.com/hpcloud/tail"
	"time"
)

// tail 示例
func main() {
	fileName := "./my.log"
	config := tail.Config{
		Location:  &tail.SeekInfo{Offset: 0, Whence: 2}, //从文件的哪个地方开始读 filebeat记录了文件断点的位置
		ReOpen:    true,                                 //重新打开，切分用
		MustExist: false,                                //文件不存在不报错
		Poll:      true,
		Follow:    true, //是否跟随
	}
	tails, err := tail.TailFile(fileName, config)
	if err != nil {
		fmt.Printf("tail file error:%s\n", err)
	}
	var (
		line *tail.Line
		ok   bool
	)
	for {
		line, ok = <-tails.Lines
		if !ok {
			fmt.Printf("tail file closed reopen,file name:%s\n", tails.Filename)
			time.Sleep(1 * time.Second)
			continue
		}
		fmt.Println("msg:", line.Text)
	}
}