kubectl: kubecfg rewrite for better modularity and improved UX

pkg/kubectl/proxy_server.go

@@ -0,0 +1,89 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubectl
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
+)
+
+// ProxyServer is a http.Handler which proxies Kubernetes APIs to remote API server.
+type ProxyServer struct {
+	Client *client.Client
+	Port   int
+}
+
+func newFileHandler(prefix, base string) http.Handler {
+	return http.StripPrefix(prefix, http.FileServer(http.Dir(base)))
+}
+
+// NewProxyServer creates and installs a new ProxyServer.
+// It automatically registers the created ProxyServer to http.DefaultServeMux.
+func NewProxyServer(filebase string, kubeClient *client.Client, port int) *ProxyServer {
+	server := &ProxyServer{
+		Client: kubeClient,
+		Port:   port,
+	}
+	http.Handle("/api/", server)
+	http.Handle("/static/", newFileHandler("/static/", filebase))
+	return server
+}
+
+// Serve starts the server (http.DefaultServeMux) on TCP port 8001, loops forever.
+func (s *ProxyServer) Serve() error {
+	addr := fmt.Sprintf(":%d", s.Port)
+	return http.ListenAndServe(addr, nil)
+}
+
+func (s *ProxyServer) doError(w http.ResponseWriter, err error) {
+	w.WriteHeader(http.StatusInternalServerError)
+	w.Header().Add("Content-type", "application/json")
+	data, _ := latest.Codec.Encode(&api.Status{
+		Status:  api.StatusFailure,
+		Message: fmt.Sprintf("internal error: %#v", err),
+	})
+	w.Write(data)
+}
+
+func (s *ProxyServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	url := r.URL
+	selector := url.Query().Get("labels")
+	fieldSelector := url.Query().Get("fields")
+	result := s.Client.
+		Verb(r.Method).
+		AbsPath(r.URL.Path).
+		ParseSelectorParam("labels", selector).
+		ParseSelectorParam("fields", fieldSelector).
+		Body(r.Body).
+		Do()
+	if result.Error() != nil {
+		s.doError(w, result.Error())
+		return
+	}
+	data, err := result.Raw()
+	if err != nil {
+		s.doError(w, err)
+		return
+	}
+	w.Header().Add("Content-type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	w.Write(data)
+}