[{"data":1,"prerenderedAt":233},["ShallowReactive",2],{"tag-窗口-1":3},{"title":4,"articles":5,"hot_article":18,"month_arch":81,"total":229,"cover":230},"窗口 - 独孤影的博客",[6],{"id":7,"title":8,"uri":8,"author":9,"tags":10,"created_at":15,"view_count":16,"content":17},60,"对gin应用基于TCP窗口的流量控制","duguying",[11,12,13,14],"gin","tcp","窗口","流量控制","2018-09-05 23:24:32",3584,"\u003Cp>TCP可以基于滑动窗口进行流量控制，使用setsockopt系统调用实现，可以限定客户端或者服务端连接的入网或出网流量，http是基于TCP协议的，因此http也可以基于TCP滑动窗口实现流量控制。golang自有的net包不支持server端TCP窗口设置，因此无法直接实现基于TCP窗口的流量控制。今天我们要对一个基于gin实现的微服务进行流量限制。\u003C\u002Fp>\u003Cp>首先，gin自带的r.Run()启动的http肯定是不行的，然后http包中的http.ListenAndServer()也是不行的，那么我们就基于TCP来实现，但是golang得net包中的net.Listen()也是不行的。这时候我们只有调用底层的系统调用了（不是cgo），我们可以使用syscall包来实现系统调用。我们分为五步：创建socket，设置socket选项，绑定端口地址，转换为golang的listener，listen。\u003C\u002Fp>\u003Cul class=\" list-paddingleft-2\" style=\"list-style-type: disc;\">\u003Cli>\u003Cp>创建原生的socket\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cpre class=\"brush:go;toolbar:false\">s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, 0)\nif err != nil {\n    log.Println("create socket failed, err:", err.Error())\n    return\n}\u003C\u002Fpre>\u003Cul class=\" list-paddingleft-2\" style=\"list-style-type: disc;\">\u003Cli>\u003Cp>设置socket选项\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cpre class=\"brush:go;toolbar:false\">\u002F\u002F set receive buffer here\nerr = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_RCVBUF, 2350)\nif err != nil {\n    log.Println("set socket option receive buffer failed, err:", err.Error())\n    return\n}\n\n\u002F\u002F set send buffer here\nerr = syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_SNDBUF, 2450)\nif err != nil {\n    log.Println("set socket option send buffer failed, err:", err.Error())\n    return\n}\u003C\u002Fpre>\u003Cul class=\" list-paddingleft-2\" style=\"list-style-type: disc;\">\u003Cli>\u003Cp>绑定端口地址\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cpre class=\"brush:go;toolbar:false\">err = syscall.Bind(s, &syscall.SockaddrInet4{Port: 8099, Addr: inetAddr("192.168.31.11")})\nif err != nil {\n    log.Println("bind socket failed, err:", err.Error())\n    return\n}\u003C\u002Fpre>\u003Cul class=\" list-paddingleft-2\" style=\"list-style-type: disc;\">\u003Cli>\u003Cp>转换为golang的listener\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cpre class=\"brush:go;toolbar:false\">f := os.NewFile(uintptr(s), "")\nln, err := net.FileListener(f)\nif err != nil {\n    log.Println("create listener failed, err:", err.Error())\n    return\n}\u003C\u002Fpre>\u003Cul class=\" list-paddingleft-2\" style=\"list-style-type: disc;\">\u003Cli>\u003Cp>listen\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cpre class=\"brush:go;toolbar:false\">err = syscall.Listen(s, 0)\nif err != nil {\n    log.Println("listen failed, err:", err.Error())\n    return\n}\u003C\u002Fpre>\u003Cp>最后我们把我们自定义的支持限流的listener应用于gin上\u003Cbr\u002F>\u003C\u002Fp>\u003Cpre class=\"brush:go;toolbar:false\">r := gin.Default()\n\nr.GET("\u002F", func(context *gin.Context) {\n    context.File("socket")\n})\n\nerr = http.Serve(ln, r)\nif err != nil {\n    log.Println("create http server failed, err:", err.Error())\n    return\n}\u003C\u002Fpre>\u003Cp>一个支持限流的http server就此实现。\u003C\u002Fp>",{"title":19,"list":20},"最热文章",[21,27,33,39,45,51,57,63,69,75],{"id":22,"title":23,"uri":24,"author":9,"created_at":25,"view_count":26},28,"docker容器目录与主机目录同步","\u002Farticle\u002Fdocker容器目录与主机目录同步","2014-12-31 12:34:08",15573,{"id":28,"title":29,"uri":30,"author":9,"created_at":31,"view_count":32},21,"beego中使用fis","\u002Farticle\u002Fbeego中使用fis","2014-12-03 10:47:56",9253,{"id":34,"title":35,"uri":36,"author":9,"created_at":37,"view_count":38},20,"用github登录，oauth开发","\u002Farticle\u002F用github登录，oauth开发","2014-11-23 13:33:37",9115,{"id":40,"title":41,"uri":42,"author":9,"created_at":43,"view_count":44},18,"windows服务注册工具nssm","\u002Farticle\u002Fwindows服务注册工具nssm","2014-10-31 21:34:39",9054,{"id":46,"title":47,"uri":48,"author":9,"created_at":49,"view_count":50},49,"用latex排版中文书籍","\u002Farticle\u002F用latex排版中文书籍","2016-10-31 11:12:02",8645,{"id":52,"title":53,"uri":54,"author":9,"created_at":55,"view_count":56},19,"texlive中文书签乱码","\u002Farticle\u002Ftexlive中文书签乱码","2014-11-15 02:54:01",8466,{"id":58,"title":59,"uri":60,"author":9,"created_at":61,"view_count":62},6,"Windows上的软件包管理器chocolatey","\u002Farticle\u002FWindows上的软件包管理器chocolatey","2014-08-10 15:55:22",8012,{"id":64,"title":65,"uri":66,"author":9,"created_at":67,"view_count":68},3,"利用开源和免费资源搭建CI环境","\u002Farticle\u002F利用开源和免费资源搭建CI环境","2014-07-04 16:54:58",7740,{"id":70,"title":71,"uri":72,"author":9,"created_at":73,"view_count":74},16,"php-fpm网站目录权限配置","\u002Farticle\u002Fphp-fpm网站目录权限配置","2014-10-18 01:36:10",7276,{"id":76,"title":77,"uri":78,"author":9,"created_at":79,"view_count":80},27,"sublime text 2插件开发，外部修改文件无法重新加载","\u002Farticle\u002Fsublime text 2插件开发，外部修改文件无法重新加载","2014-12-26 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