kubectl 源码分析之proxy

今天药忘吃喽~ 2023-02-17 13:26 16阅读 0赞

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![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAaHhwamF2YTE_size_8_color_FFFFFF_t_70_g_se_x_16][]

目前刚开始写一个月，一共写了18篇原创文章，文章目录如下：

[istio多集群探秘，部署了50次多集群后我得出的结论][istio_50]

[istio多集群链路追踪，附实操视频][istio]

[istio防故障利器，你知道几个,istio新手不要读，太难！][istio_istio]

[istio业务权限控制，原来可以这么玩][istio 1]

[istio实现非侵入压缩，微服务之间如何实现压缩][istio 2]

[不懂envoyfilter也敢说精通istio系列-http-rbac-不要只会用AuthorizationPolicy配置权限][envoyfilter_istio_-http-rbac-_AuthorizationPolicy]

[不懂envoyfilter也敢说精通istio系列-02-http-corsFilter-不要只会vs][envoyfilter_istio_-02-http-corsFilter-_vs]

[不懂envoyfilter也敢说精通istio系列-03-http-csrf filter-再也不用再代码里写csrf逻辑了][envoyfilter_istio_-03-http-csrf filter-_csrf]

[不懂envoyfilter也敢说精通istio系列http-jwt\_authn-不要只会RequestAuthorization][envoyfilter_istio_http-jwt_authn-_RequestAuthorization]

[不懂envoyfilter也敢说精通istio系列-05-fault-filter-故障注入不止是vs][envoyfilter_istio_-05-fault-filter-_vs]

[不懂envoyfilter也敢说精通istio系列-06-http-match-配置路由不只是vs][envoyfilter_istio_-06-http-match-_vs]

[不懂envoyfilter也敢说精通istio系列-07-负载均衡配置不止是dr][envoyfilter_istio_-07-_dr]

[不懂envoyfilter也敢说精通istio系列-08-连接池和断路器][envoyfilter_istio_-08-]

[不懂envoyfilter也敢说精通istio系列-09-http-route filter][envoyfilter_istio_-09-http-route filter]

[不懂envoyfilter也敢说精通istio系列-network filter-redis proxy][envoyfilter_istio_-network filter-redis proxy]

[不懂envoyfilter也敢说精通istio系列-network filter-HttpConnectionManager][envoyfilter_istio_-network filter-HttpConnectionManager]

[不懂envoyfilter也敢说精通istio系列-ratelimit-istio ratelimit完全手册][envoyfilter_istio_-ratelimit-istio ratelimit]

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//创建proxy命令
    func NewCmdProxy(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
    	cmd := &cobra.Command{//创建cobra命令
    		Use:                   "proxy [--port=PORT] [--www=static-dir] [--www-prefix=prefix] [--api-prefix=prefix]",
    		DisableFlagsInUseLine: true,
    		Short:                 i18n.T("Run a proxy to the Kubernetes API server"),
    		Long:                  proxyLong,
    		Example:               proxyExample,
    		Run: func(cmd *cobra.Command, args []string) {
    			err := RunProxy(f, streams.Out, cmd)//运行
    			cmdutil.CheckErr(err)
    		},
    	}
    	cmd.Flags().StringP("www", "w", "", "Also serve static files from the given directory under the specified prefix.")//www选项
    	cmd.Flags().StringP("www-prefix", "P", "/static/", "Prefix to serve static files under, if static file directory is specified.")//www-prefix选项
    	cmd.Flags().StringP("api-prefix", "", "/", "Prefix to serve the proxied API under.")//api-prefix选项
    	cmd.Flags().String("accept-paths", proxy.DefaultPathAcceptRE, "Regular expression for paths that the proxy should accept.")//accept-paths选项
    	cmd.Flags().String("reject-paths", proxy.DefaultPathRejectRE, "Regular expression for paths that the proxy should reject. Paths specified here will be rejected even accepted by --accept-paths.")//reject-paths选项
    	cmd.Flags().String("accept-hosts", proxy.DefaultHostAcceptRE, "Regular expression for hosts that the proxy should accept.")//accept-hosts选项
    	cmd.Flags().String("reject-methods", proxy.DefaultMethodRejectRE, "Regular expression for HTTP methods that the proxy should reject (example --reject-methods='POST,PUT,PATCH'). ")//reject-methos选项
    	cmd.Flags().IntP("port", "p", defaultPort, "The port on which to run the proxy. Set to 0 to pick a random port.")//port选项
    	cmd.Flags().StringP("address", "", "127.0.0.1", "The IP address on which to serve on.")//address选项
    	cmd.Flags().Bool("disable-filter", false, "If true, disable request filtering in the proxy. This is dangerous, and can leave you vulnerable to XSRF attacks, when used with an accessible port.")//disable-filter选项
    	cmd.Flags().StringP("unix-socket", "u", "", "Unix socket on which to run the proxy.")//unix-socket选项
    	cmd.Flags().Duration("keepalive", 0, "keepalive specifies the keep-alive period for an active network connection. Set to 0 to disable keepalive.")//keepalive选项
    	return cmd
    }

//运行
    func RunProxy(f cmdutil.Factory, out io.Writer, cmd *cobra.Command) error {
    	path := cmdutil.GetFlagString(cmd, "unix-socket")//获取unix-socket path
    	port := cmdutil.GetFlagInt(cmd, "port")//获取端口
    	address := cmdutil.GetFlagString(cmd, "address")//获取地址
    
    	if port != defaultPort && path != "" {//不能同时指定unix-socket和端口
    		return errors.New("Don't specify both --unix-socket and --port")
    	}
    
    	clientConfig, err := f.ToRESTConfig()//获取restconfig
    	if err != nil {
    		return err
    	}
    
    	staticPrefix := cmdutil.GetFlagString(cmd, "www-prefix")//获取www-prefix
    	if !strings.HasSuffix(staticPrefix, "/") {//staticPrefix追加/
    		staticPrefix += "/"
    	}
    	staticDir := cmdutil.GetFlagString(cmd, "www")//获取www选项
    	if staticDir != "" {// www选项不为空
    		fileInfo, err := os.Stat(staticDir)//判断路径是否存在，并且为目录
    		if err != nil {
    			klog.Warning("Failed to stat static file directory "+staticDir+": ", err)
    		} else if !fileInfo.IsDir() {
    			klog.Warning("Static file directory " + staticDir + " is not a directory")
    		}
    	}
    
    	apiProxyPrefix := cmdutil.GetFlagString(cmd, "api-prefix")//获取api-prefix选项
    	if !strings.HasSuffix(apiProxyPrefix, "/") {//api-prefix加/
    		apiProxyPrefix += "/"
    	}
    	filter := &proxy.FilterServer{//构造过滤器
    		AcceptPaths:   proxy.MakeRegexpArrayOrDie(cmdutil.GetFlagString(cmd, "accept-paths")),//accept-paths过滤器
    		RejectPaths:   proxy.MakeRegexpArrayOrDie(cmdutil.GetFlagString(cmd, "reject-paths")),//reject-paths过滤器
    		AcceptHosts:   proxy.MakeRegexpArrayOrDie(cmdutil.GetFlagString(cmd, "accept-hosts")),//accept-hosts过滤器
    		RejectMethods: proxy.MakeRegexpArrayOrDie(cmdutil.GetFlagString(cmd, "reject-methods")),//reject-methods过滤器
    	}
    	if cmdutil.GetFlagBool(cmd, "disable-filter") {//获取disable-filter选项
    		if path == "" {
    			klog.Warning("Request filter disabled, your proxy is vulnerable to XSRF attacks, please be cautious")
    		}
    		filter = nil//设置filter为空
    	}
    
    	keepalive := cmdutil.GetFlagDuration(cmd, "keepalive")//获取keepalived
    
    	server, err := proxy.NewServer(staticDir, apiProxyPrefix, staticPrefix, filter, clientConfig, keepalive)//构造server
    
    	// Separate listening from serving so we can report the bound port
    	// when it is chosen by os (eg: port == 0)
    	var l net.Listener
    	if path == "" {//获取监听器
    		l, err = server.Listen(address, port)
    	} else {
    		l, err = server.ListenUnix(path)
    	}
    	if err != nil {
    		klog.Fatal(err)
    	}
    	fmt.Fprintf(out, "Starting to serve on %s\n", l.Addr().String())
    	klog.Fatal(server.ServeOnListener(l))//启动服务
    	return nil
    }

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAaHhwamF2YTE_size_8_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/20211007094240106.jpg?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAaHhwamF2YTE=,size_8,color_FFFFFF,t_70,g_se,x_16
[istio_50]: https://mp.weixin.qq.com/s/_OPMjmWCDSTlmbAxytg33A
[istio]: https://mp.weixin.qq.com/s/kjvtno_UzJAGr1joxm3tvw
[istio_istio]: https://mp.weixin.qq.com/s/e2-p_NY31Mc5y07S4Bb1JQ
[istio 1]: https://mp.weixin.qq.com/s/iTV0SCQLhSOTYncp3PxoHQ
[istio 2]: https://mp.weixin.qq.com/s/eINlrT242RlAwfuZu1_PcA
[envoyfilter_istio_-http-rbac-_AuthorizationPolicy]: https://mp.weixin.qq.com/s/Q-yTGBNqkjOov49LTXPrPA
[envoyfilter_istio_-02-http-corsFilter-_vs]: https://mp.weixin.qq.com/s/bFMdrT7OKSqoWv8pDXOIqQ
[envoyfilter_istio_-03-http-csrf filter-_csrf]: https://mp.weixin.qq.com/s/dlG9phV-kMMxs4UPzuRNYg
[envoyfilter_istio_http-jwt_authn-_RequestAuthorization]: https://mp.weixin.qq.com/s/IfrJ-FdLYsdhPkDrcO_YXA
[envoyfilter_istio_-05-fault-filter-_vs]: https://mp.weixin.qq.com/s/a4gDXqD8uswgglMwkUph2Q
[envoyfilter_istio_-06-http-match-_vs]: https://mp.weixin.qq.com/s/TpS3DHdcaJiPivIS_jsIGw
[envoyfilter_istio_-07-_dr]: https://mp.weixin.qq.com/s/k-zJm7n7OOKg6MotQJYPAA
[envoyfilter_istio_-08-]: https://mp.weixin.qq.com/s/n_bJ3saNeTtXRprIymhwzg
[envoyfilter_istio_-09-http-route filter]: https://mp.weixin.qq.com/s/JAeZr0BMVQxIrB3S_7Ru0A
[envoyfilter_istio_-network filter-redis proxy]: https://mp.weixin.qq.com/s/B9IPTI8F3q42nVkqbQRlPw
[envoyfilter_istio_-network filter-HttpConnectionManager]: https://mp.weixin.qq.com/s/W3OPQWkCVvuHGS49cTNhlg
[envoyfilter_istio_-ratelimit-istio ratelimit]: https://mp.weixin.qq.com/s/KgiDsELNol27mgZvDbFsqw