golang之log rotate

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操作系统: CentOS 6.9_x64

go语言版本: 1.8.3

问题描述

golang的log模块提供的有写日志功能,示例代码如下:

/* golang log example E-Mail : Mike_Zhang@live.com */ package main import ( "log"
    "os" ) func main() { logFile,err := os.Create("test1.log") defer logFile.Close() if err != nil { log.Fatalln("open file error!") } logger := log.New(logFile,"[Debug]",log.Ldate | log.Ltime | log.Lshortfile) logger.Println("test debug message") logger.SetPrefix("[Info]") logger.Println("test info message") }

运行效果

[root@local t2]# go build logTest1.go [root@local t2]# ./logTest1 [root@local t2]# cat test1.log [Debug]2017/06/13 23:18:36 logTest1.go:19: test debug message [Info]2017/06/13 23:18:36 logTest1.go:21: test info message [root@local t2]#

go语言的log模块没有提供log rotate接口,但实际开发中我们需要该功能

我们不希望单个日志过大,否则文本编辑器无法打开,查看比较困难;

更不希望占用太大的存储空间,可以指定最多存多少个日志文件

解决方

借助带缓冲的channel来实现。

示例代码如下:

/* golang log rotate example E-Mail : Mike_Zhang@live.com */ package main import ( "fmt"
    "log"
    "os"
    "time" ) const ( BACKUP_COUNT = 5 MAX_FILE_BYTES = 2 * 1024 ) func doRotate(fPrefix string) { for j := BACKUP_COUNT; j >= 1; j-- { curFileName := fmt.Sprintf("%s_%d.log",fPrefix,j) k := j-1 preFileName := fmt.Sprintf("%s_%d.log",k) if k == 0 { preFileName = fmt.Sprintf("%s.log",fPrefix) } _,err := os.Stat(curFileName) if err == nil { os.Remove(curFileName) fmt.Println("remove : ",curFileName) } _,err = os.Stat(preFileName) if err  == nil { fmt.Println("rename : ",preFileName," => ",curFileName) err = os.Rename(preFileName,curFileName) if err != nil { fmt.Println(err) } } } } func NewLogger(fPrefix string) (*log.Logger,*os.File) { var logger *log.Logger fileName := fmt.Sprintf("%s.log",fPrefix) fmt.Println("fileName :",fileName) logFile,err := os.OpenFile(fileName,os.O_RDWR|os.O_CREATE|os.O_APPEND,0666) if err != nil { fmt.Println("open file error!") } else { logger = log.New(logFile,log.Ldate|log.Ltime|log.Lshortfile) } return logger,logFile } func logWorker(msgQueue <-chan string) { fPrefix := "msg" logger,logFile := NewLogger(fPrefix) for msg := range msgQueue { logger.Println(msg) fi,err2 := logFile.Stat() if err2 == nil { if fi.Size() > MAX_FILE_BYTES { logFile.Close() doRotate(fPrefix) logger,logFile = NewLogger(fPrefix) } } } logFile.Close() } func main() { msgQueue := make(chan string,1000) go logWorker(msgQueue) for j := 1; j <= 1000; j++ { msgQueue <- fmt.Sprintf("msg_%d",j) time.Sleep(1 * time.Second) } close(msgQueue) return }

运行效果如下:

[root@local t2]# ./logRotateTest1 fileName : msg.log rename : msg.log => msg_1.log fileName : msg.log rename : msg_1.log => msg_2.log rename : msg.log => msg_1.log fileName : msg.log rename : msg_2.log => msg_3.log rename : msg_1.log => msg_2.log rename : msg.log => msg_1.log fileName : msg.log ^C

讨论

这里只是个简单的示例代码,实现了log rotate,更多功能需自行开发。

好,就这些了,希望对你有帮助。

本文github地址:

https://github.com/mike-zhang/mikeBlogEssays/blob/master/2017/20170614_golang之logRotate.rst

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