Go operation tail

Go operation tail

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table of Contents

1. Go operation tail

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1. Go operation tail

1. tail

1. The tail library produced by the HP team is often used for log collection

2. Download and install

go get github.com/hpcloud/tail

3. Go operation tail

package main

import (
	"fmt"
	"time"

	"github.com/hpcloud/tail"
)

// tailf的用法示例

func main() {
    
    
	fileName := "./my.log"
	config := tail.Config{
    
    
		ReOpen:    true,                                 // 重新打开
		Follow:    true,                                 // 是否跟随
		Location:  &tail.SeekInfo{
    
    Offset: 0, Whence: 2}, // 从文件的哪个地方开始读
		MustExist: false,                                // 文件不存在不报错
		Poll:      true,
	}
	tails, err := tail.TailFile(fileName, config) //开始跟踪文件。输出流是Tail.Lines的通道
	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)
	}
}