tail package

用于读取持续更新的文件（tail -f）

 

package main

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

func main() {
    fileName := "./my.log"
    config := tail.Config{
        Location:  &tail.SeekInfo{Offset: 0, Whence: 2}, //程序终止后,从文件的哪个地方开始读
        ReOpen:    true,                                 //重新打开
        MustExist: false,                                //文件不存在报错
        Follow:    true,                                 //是否跟随    xx.log.bak
        Poll:      true,
    }

    tails, err := tail.TailFile(fileName, config)
    if err != nil {
        fmt.Println("tail file failed ,err:", err)
        return
    }
    var (
        line *tail.Line
        ok   bool
    )
    for {
        line, ok = <-tails.Lines
        if !ok {
            fmt.Printf("tail file close reopen , filename:%s\n", tails.Filename)
            time.Sleep(time.Second)
            continue
        }
        fmt.Println("line:", line.Text)
    }
}