// monitorFilter creates a filter that reports the metrics for a given resource and action.
func monitorFilter(action, resource string) restful.FilterFunction {
	return func(req *restful.Request, res *restful.Response, chain *restful.FilterChain) {
		reqStart := time.Now()
		chain.ProcessFilter(req, res)
		httpCode := res.StatusCode()
		metrics.Monitor(&action, &resource, util.GetClient(req.Request), &httpCode, reqStart)
	}
}

func (r *ProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	proxyHandlerTraceID := rand.Int63()

	var verb string
	var apiResource string
	var httpCode int
	reqStart := time.Now()
	defer metrics.Monitor(&verb, &apiResource, net.GetHTTPClient(req), w.Header().Get("Content-Type"), httpCode, reqStart)

	ctx, ok := r.mapper.Get(req)
	if !ok {
		internalError(w, req, errors.New("Error getting request context"))
		httpCode = http.StatusInternalServerError
		return
	}

	requestInfo, ok := request.RequestInfoFrom(ctx)
	if !ok {
		internalError(w, req, errors.New("Error getting RequestInfo from context"))
		httpCode = http.StatusInternalServerError
		return
	}
	if !requestInfo.IsResourceRequest {
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	verb = requestInfo.Verb
	namespace, resource, parts := requestInfo.Namespace, requestInfo.Resource, requestInfo.Parts

	ctx = api.WithNamespace(ctx, namespace)
	if len(parts) < 2 {
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	id := parts[1]
	remainder := ""
	if len(parts) > 2 {
		proxyParts := parts[2:]
		remainder = strings.Join(proxyParts, "/")
		if strings.HasSuffix(req.URL.Path, "/") {
			// The original path had a trailing slash, which has been stripped
			// by KindAndNamespace(). We should add it back because some
			// servers (like etcd) require it.
			remainder = remainder + "/"
		}
	}
	storage, ok := r.storage[resource]
	if !ok {
		httplog.LogOf(req, w).Addf("'%v' has no storage object", resource)
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	apiResource = resource

	gv := schema.GroupVersion{Group: requestInfo.APIGroup, Version: requestInfo.APIVersion}

	redirector, ok := storage.(rest.Redirector)
	if !ok {
		httplog.LogOf(req, w).Addf("'%v' is not a redirector", resource)
		httpCode = errorNegotiated(apierrors.NewMethodNotSupported(api.Resource(resource), "proxy"), r.serializer, gv, w, req)
		return
	}

	location, roundTripper, err := redirector.ResourceLocation(ctx, id)
	if err != nil {
		httplog.LogOf(req, w).Addf("Error getting ResourceLocation: %v", err)
		httpCode = errorNegotiated(err, r.serializer, gv, w, req)
		return
	}
	if location == nil {
		httplog.LogOf(req, w).Addf("ResourceLocation for %v returned nil", id)
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}

	if roundTripper != nil {
		glog.V(5).Infof("[%x: %v] using transport %T...", proxyHandlerTraceID, req.URL, roundTripper)
	}

	// Default to http
	if location.Scheme == "" {
		location.Scheme = "http"
	}
	// Add the subpath
	if len(remainder) > 0 {
		location.Path = singleJoiningSlash(location.Path, remainder)
	}
	// Start with anything returned from the storage, and add the original request's parameters
	values := location.Query()
	for k, vs := range req.URL.Query() {
		for _, v := range vs {
			values.Add(k, v)
		}
	}
	location.RawQuery = values.Encode()

//.........这里部分代码省略.........

func (r *ProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	proxyHandlerTraceID := rand.Int63()

	var verb string
	var apiResource string
	var httpCode int
	reqStart := time.Now()
	defer metrics.Monitor(&verb, &apiResource, util.GetClient(req), &httpCode, reqStart)

	requestInfo, err := r.apiRequestInfoResolver.GetAPIRequestInfo(req)
	if err != nil {
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	verb = requestInfo.Verb
	namespace, resource, parts := requestInfo.Namespace, requestInfo.Resource, requestInfo.Parts

	ctx, ok := r.context.Get(req)
	if !ok {
		ctx = api.NewContext()
	}
	ctx = api.WithNamespace(ctx, namespace)
	if len(parts) < 2 {
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	id := parts[1]
	remainder := ""
	if len(parts) > 2 {
		proxyParts := parts[2:]
		remainder = strings.Join(proxyParts, "/")
		if strings.HasSuffix(req.URL.Path, "/") {
			// The original path had a trailing slash, which has been stripped
			// by KindAndNamespace(). We should add it back because some
			// servers (like etcd) require it.
			remainder = remainder + "/"
		}
	}
	storage, ok := r.storage[resource]
	if !ok {
		httplog.LogOf(req, w).Addf("'%v' has no storage object", resource)
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	apiResource = resource

	redirector, ok := storage.(rest.Redirector)
	if !ok {
		httplog.LogOf(req, w).Addf("'%v' is not a redirector", resource)
		httpCode = errorJSON(errors.NewMethodNotSupported(resource, "proxy"), r.codec, w)
		return
	}

	location, roundTripper, err := redirector.ResourceLocation(ctx, id)
	if err != nil {
		httplog.LogOf(req, w).Addf("Error getting ResourceLocation: %v", err)
		status := errToAPIStatus(err)
		writeJSON(status.Code, r.codec, status, w, true)
		httpCode = status.Code
		return
	}
	if location == nil {
		httplog.LogOf(req, w).Addf("ResourceLocation for %v returned nil", id)
		notFound(w, req)
		httpCode = http.StatusNotFound
		return
	}
	// If we have a custom dialer, and no pre-existing transport, initialize it to use the dialer.
	if roundTripper == nil && r.dial != nil {
		glog.V(5).Infof("[%x: %v] making a dial-only transport...", proxyHandlerTraceID, req.URL)
		roundTripper = &http.Transport{Dial: r.dial}
	} else if roundTripper != nil {
		glog.V(5).Infof("[%x: %v] using transport %T...", proxyHandlerTraceID, req.URL, roundTripper)
	}

	// Default to http
	if location.Scheme == "" {
		location.Scheme = "http"
	}
	// Add the subpath
	if len(remainder) > 0 {
		location.Path = singleJoiningSlash(location.Path, remainder)
	}
	// Start with anything returned from the storage, and add the original request's parameters
	values := location.Query()
	for k, vs := range req.URL.Query() {
		for _, v := range vs {
			values.Add(k, v)
		}
	}
	location.RawQuery = values.Encode()

	newReq, err := http.NewRequest(req.Method, location.String(), req.Body)
	if err != nil {
		status := errToAPIStatus(err)
		writeJSON(status.Code, r.codec, status, w, true)
		notFound(w, req)
//.........这里部分代码省略.........