Go语言实现http共享(带客户访问trace)
我之前有篇文章(http://www.cnblogs.com/MikeZhang/archive/2012/03/13/httpShareGolang20120312.html)中提到过用Go语言实现http文件共享,这个版本的程序比python的实现快了点,默认情况下支持的客户端多了些,但是没有客户访问的trace,程序运行过程中,感觉像是死掉了。我想改进下,让它有trace。
代码如下:
/* File : httpShareWithTrace.go Author : Mike E-Mail : Mike_Zhang@live.com */ package main import( "fmt" "net/http" "io/ioutil" "log" "time" "os" "strings" ) func getFilelist(path string) string { m_files,err := ioutil.ReadDir(path) if err !=nil{ // println( "Get filelist error !" ) return"" } var strRet string for _,f := range m_files { // println(f.Name(),f.IsDir()) if path == "./" { strRet += "<p><a href=\""+path+""+f.Name() +" \">" + f.Name() + "</a></p>" }else{ strRet += "<p><a href=\""+path[1:]+"/"+f.Name() +" \">" + f.Name() + "</a></p>" } } return strRet } func Handler( w http.ResponseWriter,r *http.Request ){ println("Request ",r.URL.Path," from ",r.RemoteAddr) // path := r.URL.Path[1:] path := "." + r.URL.Path if path == "./favicon.ico" {http.NotFound(w,r);return} if path == "./" || getFilelist(path) != "" {fmt.Fprintf( w,"%s",getFilelist(path));return} fin,err := os.Open(path) defer fin.Close() if err != nil {fmt.Fprintf( w,"404 : Not found" );return} readLen := 1024 * 1024 buf := make([]byte,readLen) startPos := 0 println("Transfer file ",path," ... ") for { n,err := fin.ReadAt(buf,int64(startPos)) fmt.Fprintf(w,"%s",buf[:n]) if 0 == n || err != nil {break} startPos += readLen } } func main(){ port := "8080"//Default port if len(os.Args)>1 { port = strings.Join(os.Args[1:2],"")} http.HandleFunc( "/",Handler) s := &http.Server{ Addr: ":"+port, ReadTimeout: 1 * time.Hour, WriteTimeout: 1 * time.Hour, MaxHeaderBytes: (1 << 31) - 1 , //Max file size is 2048M } println("Listening on port ",port,"...") log.Fatal(s.ListenAndServe()) }
运行效果如下:
1、启动http文件共享
2、web访问
3、后台trace
说明:最大支持2G文件的下载,限时为1个小时,这里没有用充分使用http协议,直接用文件io做的。时间有限,这里暂时达到了预期功能,够局域网使用,这个等以后有时间了做进一步的优化。