Load input object for increased safety

pkg/kubectl/cmd/cmd_test.go

@@ -171,6 +171,10 @@ func NewAPIFactory() (*cmdutil.Factory, *testFactory, runtime.Codec) {
 	t := &testFactory{
 		Validator: validation.NullSchema{},
 	}
+	generators := map[string]kubectl.Generator{
+		"run-container/v1": kubectl.BasicReplicationController{},
+		"service/v1":       kubectl.ServiceGenerator{},
+	}
 	return &cmdutil.Factory{
 		Object: func() (meta.RESTMapper, runtime.ObjectTyper) {
 			return latest.RESTMapper, api.Scheme
@@ -200,6 +204,10 @@ func NewAPIFactory() (*cmdutil.Factory, *testFactory, runtime.Codec) {
 		ClientConfig: func() (*client.Config, error) {
 			return t.ClientConfig, t.Err
 		},
+		Generator: func(name string) (kubectl.Generator, bool) {
+			generator, ok := generators[name]
+			return generator, ok
+		},
 	}, t, testapi.Codec()
 }
 

pkg/kubectl/cmd/expose.go

@@ -86,8 +86,28 @@ func RunExpose(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []str
 		return err
 	}
 
-	generatorName := cmdutil.GetFlagString(cmd, "generator")
+	// Get the input object
+	var mapping *meta.RESTMapping
+	mapper, typer := f.Object()
+	v, k, err := mapper.VersionAndKindForResource(res)
+	if err != nil {
+		return err
+	}
+	mapping, err = mapper.RESTMapping(k, v)
+	if err != nil {
+		return err
+	}
+	client, err := f.RESTClient(mapping)
+	if err != nil {
+		return err
+	}
+	inputObject, err := resource.NewHelper(client, mapping).Get(namespace, name)
+	if err != nil {
+		return err
+	}
 
+	// Get the generator, setup and validate all required parameters
+	generatorName := cmdutil.GetFlagString(cmd, "generator")
 	generator, found := f.Generator(generatorName)
 	if !found {
 		return cmdutil.UsageError(cmd, fmt.Sprintf("generator %q not found.", generator))
@@ -99,19 +119,9 @@ func RunExpose(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []str
 	} else {
 		params["name"] = cmdutil.GetFlagString(cmd, "service-name")
 	}
-	var mapping *meta.RESTMapping
 	if s, found := params["selector"]; !found || len(s) == 0 || cmdutil.GetFlagInt(cmd, "port") < 1 {
-		mapper, _ := f.Object()
-		v, k, err := mapper.VersionAndKindForResource(res)
-		if err != nil {
-			return err
-		}
-		mapping, err = mapper.RESTMapping(k, v)
-		if err != nil {
-			return err
-		}
 		if len(s) == 0 {
-			s, err := f.PodSelectorForResource(mapping, namespace, name)
+			s, err := f.PodSelectorForObject(inputObject)
 			if err != nil {
 				return err
 			}
@@ -125,7 +135,7 @@ func RunExpose(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []str
 			}
 		}
 		if cmdutil.GetFlagInt(cmd, "port") < 0 && !noPorts {
-			ports, err := f.PortsForResource(mapping, namespace, name)
+			ports, err := f.PortsForObject(inputObject)
 			if err != nil {
 				return err
 			}
@@ -141,12 +151,12 @@ func RunExpose(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []str
 	if cmdutil.GetFlagBool(cmd, "create-external-load-balancer") {
 		params["create-external-load-balancer"] = "true"
 	}
-
 	err = kubectl.ValidateParams(names, params)
 	if err != nil {
 		return err
 	}
 
+	// Expose new object
 	object, err := generator.Generate(params)
 	if err != nil {
 		return err
@@ -162,7 +172,6 @@ func RunExpose(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []str
 
 	// TODO: extract this flag to a central location, when such a location exists.
 	if !cmdutil.GetFlagBool(cmd, "dry-run") {
-		mapper, typer := f.Object()
 		resourceMapper := &resource.Mapper{typer, mapper, f.ClientMapperForCommand()}
 		info, err := resourceMapper.InfoForObject(object)
 		if err != nil {

pkg/kubectl/cmd/expose_test.go

@@ -0,0 +1,98 @@
+/*
+Copyright 2015 The Kubernetes Authors 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 cmd
+
+import (
+	"bytes"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+)
+
+func TestRunExposeService(t *testing.T) {
+	tests := []struct {
+		name   string
+		args   []string
+		input  runtime.Object
+		flags  map[string]string
+		output runtime.Object
+		status int
+	}{
+		{
+			name: "expose-service-from-service",
+			args: []string{"service", "baz"},
+			input: &api.Service{
+				ObjectMeta: api.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
+				Spec: api.ServiceSpec{
+					Selector: map[string]string{"app": "go"},
+				},
+			},
+			flags: map[string]string{"selector": "func=stream", "protocol": "UDP", "port": "14", "service-name": "foo"},
+			output: &api.Service{
+				ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: "test", ResourceVersion: "12"},
+				Spec: api.ServiceSpec{
+					Ports: []api.ServicePort{
+						{
+							Name:     "default",
+							Protocol: api.Protocol("UDP"),
+							Port:     14,
+						},
+					},
+					Selector: map[string]string{"func": "stream"},
+				},
+			},
+			status: 200,
+		},
+	}
+
+	for _, test := range tests {
+		f, tf, codec := NewAPIFactory()
+		tf.Printer = &testPrinter{}
+		tf.Client = &client.FakeRESTClient{
+			Codec: codec,
+			Client: client.HTTPClientFunc(func(req *http.Request) (*http.Response, error) {
+				switch p, m := req.URL.Path, req.Method; {
+				case p == "/namespaces/test/services/baz" && m == "GET":
+					return &http.Response{StatusCode: test.status, Body: objBody(codec, test.input)}, nil
+				case p == "/namespaces/test/services" && m == "POST":
+					return &http.Response{StatusCode: test.status, Body: objBody(codec, test.output)}, nil
+				default:
+					t.Fatalf("unexpected request: %#v\n%#v", req.URL, req)
+					return nil, nil
+				}
+			}),
+		}
+		tf.Namespace = "test"
+		buf := bytes.NewBuffer([]byte{})
+
+		cmd := NewCmdExposeService(f, buf)
+		cmd.SetOutput(buf)
+		for flag, value := range test.flags {
+			cmd.Flags().Set(flag, value)
+		}
+		cmd.Run(cmd, test.args)
+
+		out := buf.String()
+		if strings.Contains(out, "services/foo") {
+			t.Errorf("%s: unexpected output: %s", test.name, out)
+		}
+	}
+}

pkg/kubectl/cmd/util/factory.go

@@ -69,11 +69,10 @@ type Factory struct {
 	Resizer func(mapping *meta.RESTMapping) (kubectl.Resizer, error)
 	// Returns a Reaper for gracefully shutting down resources.
 	Reaper func(mapping *meta.RESTMapping) (kubectl.Reaper, error)
-	// PodSelectorForResource returns the pod selector associated with the provided resource name
-	// or an error.
-	PodSelectorForResource func(mapping *meta.RESTMapping, namespace, name string) (string, error)
-	// PortForResource returns the ports associated with the provided resource name or an error
-	PortsForResource func(mapping *meta.RESTMapping, namespace, name string) ([]string, error)
+	// PodSelectorForObject returns the pod selector associated with the provided object
+	PodSelectorForObject func(object runtime.Object) (string, error)
+	// PortsForObject returns the ports associated with the provided object
+	PortsForObject func(object runtime.Object) ([]string, error)
 	// Returns a schema that can validate objects stored on disk.
 	Validator func() (validation.Schema, error)
 	// Returns the default namespace to use in cases where no other namespace is specified
@@ -145,62 +144,42 @@ func NewFactory(optionalClientConfig clientcmd.ClientConfig) *Factory {
 		Printer: func(mapping *meta.RESTMapping, noHeaders bool) (kubectl.ResourcePrinter, error) {
 			return kubectl.NewHumanReadablePrinter(noHeaders), nil
 		},
-		PodSelectorForResource: func(mapping *meta.RESTMapping, namespace, name string) (string, error) {
+		PodSelectorForObject: func(object runtime.Object) (string, error) {
 			// TODO: replace with a swagger schema based approach (identify pod selector via schema introspection)
-			client, err := clients.ClientForVersion("")
-			if err != nil {
-				return "", err
-			}
-			switch mapping.Kind {
-			case "ReplicationController":
-				rc, err := client.ReplicationControllers(namespace).Get(name)
-				if err != nil {
-					return "", err
-				}
-				return kubectl.MakeLabels(rc.Spec.Selector), nil
-			case "Pod":
-				pod, err := client.Pods(namespace).Get(name)
-				if err != nil {
-					return "", err
-				}
-				if len(pod.Labels) == 0 {
+			switch t := object.(type) {
+			case *api.ReplicationController:
+				return kubectl.MakeLabels(t.Spec.Selector), nil
+			case *api.Pod:
+				if len(t.Labels) == 0 {
 					return "", fmt.Errorf("the pod has no labels and cannot be exposed")
 				}
-				return kubectl.MakeLabels(pod.Labels), nil
-			case "Service":
-				svc, err := client.Services(namespace).Get(name)
+				return kubectl.MakeLabels(t.Labels), nil
+			case *api.Service:
+				if t.Spec.Selector == nil {
+					return "", fmt.Errorf("the service has no pod selector set")
+				}
+				return kubectl.MakeLabels(t.Spec.Selector), nil
+			default:
+				kind, err := meta.NewAccessor().Kind(object)
 				if err != nil {
 					return "", err
 				}
-				if svc.Spec.Selector == nil {
-					return "", fmt.Errorf("the service has no pod selector set")
-				}
-				return kubectl.MakeLabels(svc.Spec.Selector), nil
-			default:
-				return "", fmt.Errorf("it is not possible to get a pod selector from %s", mapping.Kind)
+				return "", fmt.Errorf("it is not possible to get a pod selector from %s", kind)
 			}
 		},
-		PortsForResource: func(mapping *meta.RESTMapping, namespace, name string) ([]string, error) {
+		PortsForObject: func(object runtime.Object) ([]string, error) {
 			// TODO: replace with a swagger schema based approach (identify pod selector via schema introspection)
-			client, err := clients.ClientForVersion("")
-			if err != nil {
-				return nil, err
-			}
-			switch mapping.Kind {
-			case "ReplicationController":
-				rc, err := client.ReplicationControllers(namespace).Get(name)
-				if err != nil {
-					return nil, err
-				}
-				return getPorts(rc.Spec.Template.Spec), nil
-			case "Pod":
-				pod, err := client.Pods(namespace).Get(name)
-				if err != nil {
-					return nil, err
-				}
-				return getPorts(pod.Spec), nil
+			switch t := object.(type) {
+			case *api.ReplicationController:
+				return getPorts(t.Spec.Template.Spec), nil
+			case *api.Pod:
+				return getPorts(t.Spec), nil
 			default:
-				return nil, fmt.Errorf("it is not possible to get ports from %s", mapping.Kind)
+				kind, err := meta.NewAccessor().Kind(object)
+				if err != nil {
+					return nil, err
+				}
+				return nil, fmt.Errorf("it is not possible to get ports from %s", kind)
 			}
 		},
 		Resizer: func(mapping *meta.RESTMapping) (kubectl.Resizer, error) {

pkg/kubectl/cmd/util/factory_test.go

@@ -17,8 +17,10 @@ limitations under the License.
 package util
 
 import (
+	"sort"
 	"testing"
 
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd"
 	clientcmdapi "github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd/api"
 )
@@ -39,3 +41,62 @@ func TestNewFactoryNoFlagBindings(t *testing.T) {
 		t.Errorf("Expected zero flags, but got %v", factory.flags)
 	}
 }
+
+func TestPodSelectorForObject(t *testing.T) {
+	f := NewFactory(nil)
+
+	svc := &api.Service{
+		ObjectMeta: api.ObjectMeta{Name: "baz", Namespace: "test"},
+		Spec: api.ServiceSpec{
+			Selector: map[string]string{
+				"foo": "bar",
+			},
+		},
+	}
+
+	expected := "foo=bar"
+	got, err := f.PodSelectorForObject(svc)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if expected != got {
+		t.Fatalf("Selector mismatch! Expected %s, got %s", expected, got)
+	}
+}
+
+func TestPortsForObject(t *testing.T) {
+	f := NewFactory(nil)
+
+	pod := &api.Pod{
+		ObjectMeta: api.ObjectMeta{Name: "baz", Namespace: "test", ResourceVersion: "12"},
+		Spec: api.PodSpec{
+			Containers: []api.Container{
+				{
+					Ports: []api.ContainerPort{
+						{
+							ContainerPort: 101,
+						},
+					},
+				},
+			},
+		},
+	}
+
+	expected := []string{"101"}
+	got, err := f.PortsForObject(pod)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	if len(expected) != len(got) {
+		t.Fatalf("Ports size mismatch! Expected %d, got %d", len(expected), len(got))
+	}
+
+	sort.Strings(expected)
+	sort.Strings(got)
+
+	for i, port := range got {
+		if port != expected[i] {
+			t.Fatalf("Port mismatch! Expected %s, got %s", expected[i], port)
+		}
+	}
+}