return
	}

	listener = &httpListener{
		listeners: listeners,
		acceptCh:  make(chan acceptResult, len(listeners)),
		opts:      opts,
	}
	listener.ctx, listener.ctxCanceler = context.WithCancel(ctx)
	if opts.Trace != nil {
		opts.Trace(fmt.Sprint("opening ", len(listener.listeners), " listeners"))
	}
	listener.start()

	return

	}
	diff := difflib.UnifiedDiff{
		FromFile: "Istiod Listeners",
		A:        difflib.SplitLines(istiodBytes.String()),
		ToFile:   "Envoy Listeners",
		B:        difflib.SplitLines(envoyBytes.String()),
		Context:  c.context,
	}
	text, err := difflib.GetUnifiedDiffString(diff)
	if err != nil {
		return err
	}
	if text != "" {
		fmt.Fprintln(c.w, "Listeners Don't Match")
		fmt.Fprintln(c.w, text)
	} else {

		if l.Listener != nil {
			listenerTyped := &listener.Listener{}
			// Support v2 or v3 in config dump. See ads.go:RequestedTypes for more info.
			l.Listener.TypeUrl = v3.ListenerType
			err = l.Listener.UnmarshalTo(listenerTyped)
			if err != nil {
				return nil, fmt.Errorf("unmarshal listener: %v", err)
			}
			listeners = append(listeners, listenerTyped)
		}
	}
	if len(listeners) == 0 {

		l := &listener.Listener{}
		err = dal[i].ActiveState.Listener.UnmarshalTo(l)
		if err != nil {
			return false
		}
		name := l.Name
		err = dal[j].ActiveState.Listener.UnmarshalTo(l)
		if err != nil {
			return false
		}
		return name < l.Name
	})
	if stripVersions {
		for i := range dal {
			dal[i].ActiveState.VersionInfo = ""
			dal[i].ActiveState.LastUpdated = nil

		return "", ""
	}
	return fmt.Sprintf("%s.%s", parts[2], parts[1]), parts[3]
}

// Print prints the AuthorizationPolicy in the listener.
func Print(writer io.Writer, listeners []*listener.Listener) {
	parsedListeners := parse(listeners)
	if parsedListeners == nil {
		return
	}

	actionToPolicy := map[rbacpb.RBAC_Action]map[string]struct{}{}
	policyToRule := map[string]map[string]struct{}{}

	}

	var err error
	listener, err := net.Listen("unix", path)
	if err != nil {
		return nil, fmt.Errorf("failed to listen on unix socket %q: %v", path, err)
	}

	// Update file permission so that cni plugin has permission to access it.
	if _, err := os.Stat(path); err != nil {
		return nil, fmt.Errorf("cni listener file %q doesn't exist", path)
	}

		listeners = append(listeners, l)
	}
	return
}

func startHTTPServer(listener net.Listener, handler http.Handler) (server *httptest.Server) {
	server = httptest.NewUnstartedServer(handler)
	server.Config.Addr = listener.Addr().String()
	server.Listener = listener
	server.Start()
	return server
}

func dummyRequestValidate(r *http.Request) error {
	return nil
}

				Type: "TCP",
			},
			inListener: &listener.Listener{
				FilterChains: []*listener.FilterChain{{
					Filters: []*listener.Filter{{
						Name: wellknown.TCPProxy,
					}},
				}},
			},
			expect: true,
		},
		{
			desc: "unknown-type",
			inFilter: &ListenerFilter{
				Type: "UNKNOWN",
			},
			inListener: &listener.Listener{
				FilterChains: []*listener.FilterChain{{

		// Support v2 or v3 in config dump. See ads.go:RequestedTypes for more info.
		l.ActiveState.Listener.TypeUrl = v3.ListenerType
		err := l.ActiveState.Listener.UnmarshalTo(listenerTyped)
		if err != nil {
			return
		}
		listeners = append(listeners, listenerTyped)
	}
	Print(writer, listeners)

)

func SetupMonitoring(port int, path string, stop <-chan struct{}) {
	if port <= 0 {
		return
	}
	mux := http.NewServeMux()
	var listener net.Listener
	var err error
	if listener, err = net.Listen("tcp", fmt.Sprintf(":%d", port)); err != nil {
		log.Errorf("unable to listen on socket: %v", err)
		return
	}
	exporter, err := monitoring.RegisterPrometheusExporter(nil, nil)
	if err != nil {