Improve ResourceLocation API, allow proxy to use authenticated transport

pkg/registry/pod/etcd/etcd.go

@@ -18,6 +18,8 @@ package etcd
 
 import (
 	"fmt"
+	"net/http"
+	"net/url"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
@@ -75,8 +77,11 @@ func NewStorage(h tools.EtcdHelper) (*REST, *BindingREST, *StatusREST) {
 	return &REST{*store}, &BindingREST{store: store}, &StatusREST{store: &statusStore}
 }
 
+// Implement Redirector.
+var _ = rest.Redirector(&REST{})
+
 // ResourceLocation returns a pods location from its HostIP
-func (r *REST) ResourceLocation(ctx api.Context, name string) (string, error) {
+func (r *REST) ResourceLocation(ctx api.Context, name string) (*url.URL, http.RoundTripper, error) {
 	return pod.ResourceLocation(r, ctx, name)
 }
 

pkg/registry/pod/etcd/etcd_test.go

@@ -683,13 +683,19 @@ func TestResourceLocation(t *testing.T) {
 		storage = storage.WithPodStatus(cache)
 
 		redirector := rest.Redirector(storage)
-		location, err := redirector.ResourceLocation(api.NewDefaultContext(), tc.query)
+		location, _, err := redirector.ResourceLocation(api.NewDefaultContext(), tc.query)
 		if err != nil {
 			t.Errorf("Unexpected error: %v", err)
 		}
+		if location == nil {
+			t.Errorf("Unexpected nil: %v", location)
+		}
 
-		if location != tc.location {
-			t.Errorf("Expected %v, but got %v", tc.location, location)
+		if location.Scheme != "" {
+			t.Errorf("Expected '%v', but got '%v'", "", location.Scheme)
+		}
+		if location.Host != tc.location {
+			t.Errorf("Expected %v, but got %v", tc.location, location.Host)
 		}
 	}
 }

pkg/registry/pod/rest.go

@@ -18,6 +18,9 @@ package pod
 
 import (
 	"fmt"
+	"net"
+	"net/http"
+	"net/url"
 	"strings"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
@@ -151,12 +154,12 @@ type ResourceGetter interface {
 }
 
 // ResourceLocation returns a URL to which one can send traffic for the specified pod.
-func ResourceLocation(getter ResourceGetter, ctx api.Context, id string) (string, error) {
+func ResourceLocation(getter ResourceGetter, ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
 	// Allow ID as "podname" or "podname:port".  If port is not specified,
 	// try to use the first defined port on the pod.
 	parts := strings.Split(id, ":")
 	if len(parts) > 2 {
-		return "", errors.NewBadRequest(fmt.Sprintf("invalid pod request %q", id))
+		return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid pod request %q", id))
 	}
 	name := parts[0]
 	port := ""
@@ -167,11 +170,11 @@ func ResourceLocation(getter ResourceGetter, ctx api.Context, id string) (string
 
 	obj, err := getter.Get(ctx, name)
 	if err != nil {
-		return "", err
+		return nil, nil, err
 	}
 	pod := obj.(*api.Pod)
 	if pod == nil {
-		return "", nil
+		return nil, nil, nil
 	}
 
 	// Try to figure out a port.
@@ -186,9 +189,11 @@ func ResourceLocation(getter ResourceGetter, ctx api.Context, id string) (string
 
 	// We leave off the scheme ('http://') because we have no idea what sort of server
 	// is listening at this endpoint.
-	loc := pod.Status.PodIP
-	if port != "" {
-		loc += fmt.Sprintf(":%s", port)
+	loc := &url.URL{}
+	if port == "" {
+		loc.Host = pod.Status.PodIP
+	} else {
+		loc.Host = net.JoinHostPort(pod.Status.PodIP, port)
 	}
-	return loc, nil
+	return loc, nil, nil
 }