Do interface{} -> runtime.Object rename everywhere

examples/examples_test.go

@@ -31,7 +31,7 @@ import (
 	"github.com/golang/glog"
 )
 
-func validateObject(obj interface{}) (errors []error) {
+func validateObject(obj runtime.Object) (errors []error) {
 	switch t := obj.(type) {
 	case *api.ReplicationController:
 		errors = validation.ValidateManifest(&t.DesiredState.PodTemplate.DesiredState.Manifest)
@@ -85,7 +85,7 @@ func walkJSONFiles(inDir string, fn func(name, path string, data []byte)) error
 }
 
 func TestApiExamples(t *testing.T) {
-	expected := map[string]interface{}{
+	expected := map[string]runtime.Object{
 		"controller":       &api.ReplicationController{},
 		"controller-list":  &api.ReplicationControllerList{},
 		"pod":              &api.Pod{},
@@ -120,7 +120,7 @@ func TestApiExamples(t *testing.T) {
 }
 
 func TestExamples(t *testing.T) {
-	expected := map[string]interface{}{
+	expected := map[string]runtime.Object{
 		"frontend-controller":    &api.ReplicationController{},
 		"redis-slave-controller": &api.ReplicationController{},
 		"redis-master":           &api.Pod{},

pkg/apiserver/apiserver.go

@@ -27,17 +27,11 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/healthz"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/version"
 	"github.com/golang/glog"
 )
 
-// Codec defines methods for serializing and deserializing API objects.
-type Codec interface {
-	Encode(obj interface{}) (data []byte, err error)
-	Decode(data []byte) (interface{}, error)
-	DecodeInto(data []byte, obj interface{}) error
-}
-
 // mux is an object that can register http handlers.
 type mux interface {
 	Handle(pattern string, handler http.Handler)
@@ -53,7 +47,7 @@ type defaultAPIServer struct {
 // Handle returns a Handler function that expose the provided storage interfaces
 // as RESTful resources at prefix, serialized by codec, and also includes the support
 // http resources.
-func Handle(storage map[string]RESTStorage, codec Codec, prefix string) http.Handler {
+func Handle(storage map[string]RESTStorage, codec runtime.Codec, prefix string) http.Handler {
 	group := NewAPIGroup(storage, codec)
 
 	mux := http.NewServeMux()
@@ -78,7 +72,7 @@ type APIGroup struct {
 // This is a helper method for registering multiple sets of REST handlers under different
 // prefixes onto a server.
 // TODO: add multitype codec serialization
-func NewAPIGroup(storage map[string]RESTStorage, codec Codec) *APIGroup {
+func NewAPIGroup(storage map[string]RESTStorage, codec runtime.Codec) *APIGroup {
 	return &APIGroup{RESTHandler{
 		storage: storage,
 		codec:   codec,
@@ -147,7 +141,7 @@ func handleVersion(w http.ResponseWriter, req *http.Request) {
 }
 
 // writeJSON renders an object as JSON to the response.
-func writeJSON(statusCode int, codec Codec, object interface{}, w http.ResponseWriter) {
+func writeJSON(statusCode int, codec runtime.Codec, object runtime.Object, w http.ResponseWriter) {
 	output, err := codec.Encode(object)
 	if err != nil {
 		errorJSON(err, codec, w)
@@ -159,7 +153,7 @@ func writeJSON(statusCode int, codec Codec, object interface{}, w http.ResponseW
 }
 
 // errorJSON renders an error to the response.
-func errorJSON(err error, codec Codec, w http.ResponseWriter) {
+func errorJSON(err error, codec runtime.Codec, w http.ResponseWriter) {
 	status := errToAPIStatus(err)
 	writeJSON(status.Code, codec, status, w)
 }

pkg/apiserver/async.go

@@ -17,18 +17,19 @@ limitations under the License.
 package apiserver
 
 import (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
 // WorkFunc is used to perform any time consuming work for an api call, after
 // the input has been validated. Pass one of these to MakeAsync to create an
 // appropriate return value for the Update, Delete, and Create methods.
-type WorkFunc func() (result interface{}, err error)
+type WorkFunc func() (result runtime.Object, err error)
 
 // MakeAsync takes a function and executes it, delivering the result in the way required
 // by RESTStorage's Update, Delete, and Create methods.
-func MakeAsync(fn WorkFunc) <-chan interface{} {
-	channel := make(chan interface{})
+func MakeAsync(fn WorkFunc) <-chan runtime.Object {
+	channel := make(chan runtime.Object)
 	go func() {
 		defer util.HandleCrash()
 		obj, err := fn()

pkg/apiserver/interfaces.go

@@ -18,6 +18,7 @@ package apiserver
 
 import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 )
 
@@ -25,25 +26,25 @@ import (
 // Resources which are exported to the RESTful API of apiserver need to implement this interface.
 type RESTStorage interface {
 	// New returns an empty object that can be used with Create and Update after request data has been put into it.
-	// This object must be a pointer type for use with Codec.DecodeInto([]byte, interface{})
-	New() interface{}
+	// This object must be a pointer type for use with Codec.DecodeInto([]byte, runtime.Object)
+	New() runtime.Object
 
 	// List selects resources in the storage which match to the selector.
 	// TODO: add field selector in addition to label selector.
-	List(labels.Selector) (interface{}, error)
+	List(labels.Selector) (runtime.Object, error)
 
 	// Get finds a resource in the storage by id and returns it.
 	// Although it can return an arbitrary error value, IsNotFound(err) is true for the
 	// returned error value err when the specified resource is not found.
-	Get(id string) (interface{}, error)
+	Get(id string) (runtime.Object, error)
 
 	// Delete finds a resource in the storage and deletes it.
 	// Although it can return an arbitrary error value, IsNotFound(err) is true for the
 	// returned error value err when the specified resource is not found.
-	Delete(id string) (<-chan interface{}, error)
+	Delete(id string) (<-chan runtime.Object, error)
 
-	Create(interface{}) (<-chan interface{}, error)
-	Update(interface{}) (<-chan interface{}, error)
+	Create(runtime.Object) (<-chan runtime.Object, error)
+	Update(runtime.Object) (<-chan runtime.Object, error)
 }
 
 // ResourceWatcher should be implemented by all RESTStorage objects that

pkg/apiserver/operation.go

@@ -25,12 +25,13 @@ import (
 	"time"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
 type OperationHandler struct {
 	ops   *Operations
-	codec Codec
+	codec runtime.Codec
 }
 
 func (h *OperationHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
@@ -63,8 +64,8 @@ func (h *OperationHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 // Operation represents an ongoing action which the server is performing.
 type Operation struct {
 	ID       string
-	result   interface{}
-	awaiting <-chan interface{}
+	result   runtime.Object
+	awaiting <-chan runtime.Object
 	finished *time.Time
 	lock     sync.Mutex
 	notify   chan struct{}
@@ -90,7 +91,7 @@ func NewOperations() *Operations {
 }
 
 // NewOperation adds a new operation. It is lock-free.
-func (ops *Operations) NewOperation(from <-chan interface{}) *Operation {
+func (ops *Operations) NewOperation(from <-chan runtime.Object) *Operation {
 	id := atomic.AddInt64(&ops.lastID, 1)
 	op := &Operation{
 		ID:       strconv.FormatInt(id, 10),
@@ -110,7 +111,7 @@ func (ops *Operations) insert(op *Operation) {
 }
 
 // List lists operations for an API client.
-func (ops *Operations) List() api.ServerOpList {
+func (ops *Operations) List() *api.ServerOpList {
 	ops.lock.Lock()
 	defer ops.lock.Unlock()
 
@@ -119,7 +120,7 @@ func (ops *Operations) List() api.ServerOpList {
 		ids = append(ids, id)
 	}
 	sort.StringSlice(ids).Sort()
-	ol := api.ServerOpList{}
+	ol := &api.ServerOpList{}
 	for _, id := range ids {
 		ol.Items = append(ol.Items, api.ServerOp{JSONBase: api.JSONBase{ID: id}})
 	}
@@ -185,7 +186,7 @@ func (op *Operation) expired(limitTime time.Time) bool {
 
 // StatusOrResult returns status information or the result of the operation if it is complete,
 // with a bool indicating true in the latter case.
-func (op *Operation) StatusOrResult() (description interface{}, finished bool) {
+func (op *Operation) StatusOrResult() (description runtime.Object, finished bool) {
 	op.lock.Lock()
 	defer op.lock.Unlock()
 

pkg/apiserver/redirect.go

@@ -20,11 +20,12 @@ import (
 	"net/http"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 )
 
 type RedirectHandler struct {
 	storage map[string]RESTStorage
-	codec   Codec
+	codec   runtime.Codec
 }
 
 func (r *RedirectHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {

pkg/apiserver/resthandler.go

@@ -23,11 +23,12 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 )
 
 type RESTHandler struct {
 	storage     map[string]RESTStorage
-	codec       Codec
+	codec       runtime.Codec
 	ops         *Operations
 	asyncOpWait time.Duration
 }
@@ -158,7 +159,7 @@ func (h *RESTHandler) handleRESTStorage(parts []string, req *http.Request, w htt
 }
 
 // createOperation creates an operation to process a channel response.
-func (h *RESTHandler) createOperation(out <-chan interface{}, sync bool, timeout time.Duration) *Operation {
+func (h *RESTHandler) createOperation(out <-chan runtime.Object, sync bool, timeout time.Duration) *Operation {
 	op := h.ops.NewOperation(out)
 	if sync {
 		op.WaitFor(timeout)
@@ -175,11 +176,6 @@ func (h *RESTHandler) finishReq(op *Operation, w http.ResponseWriter) {
 	if complete {
 		status := http.StatusOK
 		switch stat := obj.(type) {
-		case api.Status:
-			httplog.LogOf(w).Addf("programmer error: use *api.Status as a result, not api.Status.")
-			if stat.Code != 0 {
-				status = stat.Code
-			}
 		case *api.Status:
 			if stat.Code != 0 {
 				status = stat.Code

pkg/apiserver/watch.go

@@ -32,7 +32,7 @@ import (
 
 type WatchHandler struct {
 	storage map[string]RESTStorage
-	codec   Codec
+	codec   runtime.Codec
 }
 
 func getWatchParams(query url.Values) (label, field labels.Selector, resourceVersion uint64) {

pkg/client/request.go

@@ -187,7 +187,8 @@ func (r *Request) Timeout(d time.Duration) *Request {
 // If obj is a string, try to read a file of that name.
 // If obj is a []byte, send it directly.
 // If obj is an io.Reader, use it directly.
-// Otherwise, assume obj is an api type and marshall it correctly.
+// If obj is a runtime.Object, marshal it correctly.
+// Otherwise, set an error.
 func (r *Request) Body(obj interface{}) *Request {
 	if r.err != nil {
 		return r
@@ -204,13 +205,15 @@ func (r *Request) Body(obj interface{}) *Request {
 		r.body = bytes.NewBuffer(t)
 	case io.Reader:
 		r.body = t
-	default:
-		data, err := runtime.DefaultCodec.Encode(obj)
+	case runtime.Object:
+		data, err := runtime.DefaultCodec.Encode(t)
 		if err != nil {
 			r.err = err
 			return r
 		}
 		r.body = bytes.NewBuffer(data)
+	default:
+		r.err = fmt.Errorf("Unknown type used for body: %#v", obj)
 	}
 	return r
 }
@@ -314,7 +317,7 @@ func (r Result) Raw() ([]byte, error) {
 }
 
 // Get returns the result as an object.
-func (r Result) Get() (interface{}, error) {
+func (r Result) Get() (runtime.Object, error) {
 	if r.err != nil {
 		return nil, r.err
 	}
@@ -322,7 +325,7 @@ func (r Result) Get() (interface{}, error) {
 }
 
 // Into stores the result into obj, if possible.
-func (r Result) Into(obj interface{}) error {
+func (r Result) Into(obj runtime.Object) error {
 	if r.err != nil {
 		return r.err
 	}

pkg/kubecfg/parse.go

@@ -43,7 +43,7 @@ func (p *Parser) ToWireFormat(data []byte, storage string) ([]byte, error) {
 		return nil, fmt.Errorf("unknown storage type: %v", storage)
 	}
 
-	obj := reflect.New(prototypeType).Interface()
+	obj := reflect.New(prototypeType).Interface().(runtime.Object)
 	err := runtime.DefaultCodec.DecodeInto(data, obj)
 	if err != nil {
 		return nil, err

pkg/kubecfg/proxy_server.go

@@ -53,7 +53,7 @@ func (s *ProxyServer) Serve() error {
 func (s *ProxyServer) doError(w http.ResponseWriter, err error) {
 	w.WriteHeader(http.StatusInternalServerError)
 	w.Header().Add("Content-type", "application/json")
-	data, _ := runtime.DefaultCodec.Encode(api.Status{
+	data, _ := runtime.DefaultCodec.Encode(&api.Status{
 		Status:  api.StatusFailure,
 		Message: fmt.Sprintf("internal error: %#v", err),
 	})

pkg/kubecfg/resource_printer.go

@@ -36,7 +36,7 @@ import (
 type ResourcePrinter interface {
 	// Print receives an arbitrary JSON body, formats it and prints it to a writer.
 	Print([]byte, io.Writer) error
-	PrintObj(interface{}, io.Writer) error
+	PrintObj(runtime.Object, io.Writer) error
 }
 
 // IdentityPrinter is an implementation of ResourcePrinter which simply copies the body out to the output stream.
@@ -49,7 +49,7 @@ func (i *IdentityPrinter) Print(data []byte, w io.Writer) error {
 }
 
 // PrintObj is an implementation of ResourcePrinter.PrintObj which simply writes the object to the Writer.
-func (i *IdentityPrinter) PrintObj(obj interface{}, output io.Writer) error {
+func (i *IdentityPrinter) PrintObj(obj runtime.Object, output io.Writer) error {
 	data, err := runtime.DefaultCodec.Encode(obj)
 	if err != nil {
 		return err
@@ -62,7 +62,7 @@ type YAMLPrinter struct{}
 
 // Print parses the data as JSON, re-formats as YAML and prints the YAML.
 func (y *YAMLPrinter) Print(data []byte, w io.Writer) error {
-	var obj interface{}
+	var obj runtime.Object
 	if err := json.Unmarshal(data, &obj); err != nil {
 		return err
 	}
@@ -75,7 +75,7 @@ func (y *YAMLPrinter) Print(data []byte, w io.Writer) error {
 }
 
 // PrintObj prints the data as YAML.
-func (y *YAMLPrinter) PrintObj(obj interface{}, w io.Writer) error {
+func (y *YAMLPrinter) PrintObj(obj runtime.Object, w io.Writer) error {
 	output, err := yaml.Marshal(obj)
 	if err != nil {
 		return err
@@ -251,7 +251,7 @@ func printStatus(status *api.Status, w io.Writer) error {
 // Print parses the data as JSON, then prints the parsed data in a human-friendly
 // format according to the type of the data.
 func (h *HumanReadablePrinter) Print(data []byte, output io.Writer) error {
-	var mapObj map[string]interface{}
+	var mapObj map[string]runtime.Object
 	if err := json.Unmarshal([]byte(data), &mapObj); err != nil {
 		return err
 	}
@@ -268,7 +268,7 @@ func (h *HumanReadablePrinter) Print(data []byte, output io.Writer) error {
 }
 
 // PrintObj prints the obj in a human-friendly format according to the type of the obj.
-func (h *HumanReadablePrinter) PrintObj(obj interface{}, output io.Writer) error {
+func (h *HumanReadablePrinter) PrintObj(obj runtime.Object, output io.Writer) error {
 	w := tabwriter.NewWriter(output, 20, 5, 3, ' ', 0)
 	defer w.Flush()
 	if handler := h.handlerMap[reflect.TypeOf(obj)]; handler != nil {
@@ -300,6 +300,6 @@ func (t *TemplatePrinter) Print(data []byte, w io.Writer) error {
 }
 
 // PrintObj formats the obj with the Go Template.
-func (t *TemplatePrinter) PrintObj(obj interface{}, w io.Writer) error {
+func (t *TemplatePrinter) PrintObj(obj runtime.Object, w io.Writer) error {
 	return t.Template.Execute(w, obj)
 }

pkg/master/master.go

@@ -131,7 +131,7 @@ func (m *Master) init(cloud cloudprovider.Interface, podInfoGetter client.PodInf
 }
 
 // API_v1beta1 returns the resources and codec for API version v1beta1.
-func (m *Master) API_v1beta1() (map[string]apiserver.RESTStorage, apiserver.Codec) {
+func (m *Master) API_v1beta1() (map[string]apiserver.RESTStorage, runtime.Codec) {
 	storage := make(map[string]apiserver.RESTStorage)
 	for k, v := range m.storage {
 		storage[k] = v

pkg/registry/binding/storage.go

@@ -23,6 +23,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 )
 
 // BindingStorage implements the RESTStorage interface. When bindings are written, it
@@ -40,32 +41,32 @@ func NewBindingStorage(bindingRegistry Registry) *BindingStorage {
 }
 
 // List returns an error because bindings are write-only objects.
-func (*BindingStorage) List(selector labels.Selector) (interface{}, error) {
+func (*BindingStorage) List(selector labels.Selector) (runtime.Object, error) {
 	return nil, errors.NewNotFound("binding", "list")
 }
 
 // Get returns an error because bindings are write-only objects.
-func (*BindingStorage) Get(id string) (interface{}, error) {
+func (*BindingStorage) Get(id string) (runtime.Object, error) {
 	return nil, errors.NewNotFound("binding", id)
 }
 
 // Delete returns an error because bindings are write-only objects.
-func (*BindingStorage) Delete(id string) (<-chan interface{}, error) {
+func (*BindingStorage) Delete(id string) (<-chan runtime.Object, error) {
 	return nil, errors.NewNotFound("binding", id)
 }
 
 // New returns a new binding object fit for having data unmarshalled into it.
-func (*BindingStorage) New() interface{} {
+func (*BindingStorage) New() runtime.Object {
 	return &api.Binding{}
 }
 
 // Create attempts to make the assignment indicated by the binding it recieves.
-func (b *BindingStorage) Create(obj interface{}) (<-chan interface{}, error) {
+func (b *BindingStorage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	binding, ok := obj.(*api.Binding)
 	if !ok {
 		return nil, fmt.Errorf("incorrect type: %#v", obj)
 	}
-	return apiserver.MakeAsync(func() (interface{}, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		if err := b.registry.ApplyBinding(binding); err != nil {
 			return nil, err
 		}
@@ -74,6 +75,6 @@ func (b *BindingStorage) Create(obj interface{}) (<-chan interface{}, error) {
 }
 
 // Update returns an error-- this object may not be updated.
-func (b *BindingStorage) Update(obj interface{}) (<-chan interface{}, error) {
+func (b *BindingStorage) Update(obj runtime.Object) (<-chan runtime.Object, error) {
 	return nil, fmt.Errorf("Bindings may not be changed.")
 }

pkg/registry/controller/registry.go

@@ -26,7 +26,7 @@ type Registry interface {
 	ListControllers() (*api.ReplicationControllerList, error)
 	WatchControllers(resourceVersion uint64) (watch.Interface, error)
 	GetController(controllerID string) (*api.ReplicationController, error)
-	CreateController(controller api.ReplicationController) error
-	UpdateController(controller api.ReplicationController) error
+	CreateController(controller *api.ReplicationController) error
+	UpdateController(controller *api.ReplicationController) error
 	DeleteController(controllerID string) error
 }

pkg/registry/controller/storage.go

@@ -26,6 +26,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/pod"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 
@@ -51,7 +52,7 @@ func NewRegistryStorage(registry Registry, podRegistry pod.Registry) apiserver.R
 }
 
 // Create registers the given ReplicationController.
-func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	controller, ok := obj.(*api.ReplicationController)
 	if !ok {
 		return nil, fmt.Errorf("not a replication controller: %#v", obj)
@@ -67,8 +68,8 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 
 	controller.CreationTimestamp = util.Now()
 
-	return apiserver.MakeAsync(func() (interface{}, error) {
-		err := rs.registry.CreateController(*controller)
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
+		err := rs.registry.CreateController(controller)
 		if err != nil {
 			return nil, err
 		}
@@ -77,14 +78,14 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 }
 
 // Delete asynchronously deletes the ReplicationController specified by its id.
-func (rs *RegistryStorage) Delete(id string) (<-chan interface{}, error) {
-	return apiserver.MakeAsync(func() (interface{}, error) {
+func (rs *RegistryStorage) Delete(id string) (<-chan runtime.Object, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		return &api.Status{Status: api.StatusSuccess}, rs.registry.DeleteController(id)
 	}), nil
 }
 
 // Get obtains the ReplicationController specified by its id.
-func (rs *RegistryStorage) Get(id string) (interface{}, error) {
+func (rs *RegistryStorage) Get(id string) (runtime.Object, error) {
 	controller, err := rs.registry.GetController(id)
 	if err != nil {
 		return nil, err
@@ -93,7 +94,7 @@ func (rs *RegistryStorage) Get(id string) (interface{}, error) {
 }
 
 // List obtains a list of ReplicationControllers that match selector.
-func (rs *RegistryStorage) List(selector labels.Selector) (interface{}, error) {
+func (rs *RegistryStorage) List(selector labels.Selector) (runtime.Object, error) {
 	controllers, err := rs.registry.ListControllers()
 	if err != nil {
 		return nil, err
@@ -109,13 +110,13 @@ func (rs *RegistryStorage) List(selector labels.Selector) (interface{}, error) {
 }
 
 // New creates a new ReplicationController for use with Create and Update.
-func (rs RegistryStorage) New() interface{} {
+func (rs RegistryStorage) New() runtime.Object {
 	return &api.ReplicationController{}
 }
 
 // Update replaces a given ReplicationController instance with an existing
 // instance in storage.registry.
-func (rs *RegistryStorage) Update(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Update(obj runtime.Object) (<-chan runtime.Object, error) {
 	controller, ok := obj.(*api.ReplicationController)
 	if !ok {
 		return nil, fmt.Errorf("not a replication controller: %#v", obj)
@@ -123,8 +124,8 @@ func (rs *RegistryStorage) Update(obj interface{}) (<-chan interface{}, error) {
 	if errs := validation.ValidateReplicationController(controller); len(errs) > 0 {
 		return nil, errors.NewInvalid("replicationController", controller.ID, errs)
 	}
-	return apiserver.MakeAsync(func() (interface{}, error) {
-		err := rs.registry.UpdateController(*controller)
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
+		err := rs.registry.UpdateController(controller)
 		if err != nil {
 			return nil, err
 		}
@@ -148,7 +149,7 @@ func (rs *RegistryStorage) Watch(label, field labels.Selector, resourceVersion u
 	}), nil
 }
 
-func (rs *RegistryStorage) waitForController(ctrl api.ReplicationController) (interface{}, error) {
+func (rs *RegistryStorage) waitForController(ctrl *api.ReplicationController) (runtime.Object, error) {
 	for {
 		pods, err := rs.podRegistry.ListPods(labels.Set(ctrl.DesiredState.ReplicaSelector).AsSelector())
 		if err != nil {

pkg/registry/endpoint/registry.go

@@ -27,5 +27,5 @@ type Registry interface {
 	ListEndpoints() (*api.EndpointsList, error)
 	GetEndpoints(name string) (*api.Endpoints, error)
 	WatchEndpoints(labels, fields labels.Selector, resourceVersion uint64) (watch.Interface, error)
-	UpdateEndpoints(e api.Endpoints) error
+	UpdateEndpoints(e *api.Endpoints) error
 }

pkg/registry/endpoint/storage.go

@@ -22,6 +22,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 )
 
@@ -38,12 +39,12 @@ func NewStorage(registry Registry) apiserver.RESTStorage {
 }
 
 // Get satisfies the RESTStorage interface.
-func (rs *Storage) Get(id string) (interface{}, error) {
+func (rs *Storage) Get(id string) (runtime.Object, error) {
 	return rs.registry.GetEndpoints(id)
 }
 
 // List satisfies the RESTStorage interface.
-func (rs *Storage) List(selector labels.Selector) (interface{}, error) {
+func (rs *Storage) List(selector labels.Selector) (runtime.Object, error) {
 	if !selector.Empty() {
 		return nil, errors.New("label selectors are not supported on endpoints")
 	}
@@ -57,21 +58,21 @@ func (rs *Storage) Watch(label, field labels.Selector, resourceVersion uint64) (
 }
 
 // Create satisfies the RESTStorage interface but is unimplemented.
-func (rs *Storage) Create(obj interface{}) (<-chan interface{}, error) {
+func (rs *Storage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	return nil, errors.New("unimplemented")
 }
 
 // Update satisfies the RESTStorage interface but is unimplemented.
-func (rs *Storage) Update(obj interface{}) (<-chan interface{}, error) {
+func (rs *Storage) Update(obj runtime.Object) (<-chan runtime.Object, error) {
 	return nil, errors.New("unimplemented")
 }
 
 // Delete satisfies the RESTStorage interface but is unimplemented.
-func (rs *Storage) Delete(id string) (<-chan interface{}, error) {
+func (rs *Storage) Delete(id string) (<-chan runtime.Object, error) {
 	return nil, errors.New("unimplemented")
 }
 
 // New implements the RESTStorage interface.
-func (rs Storage) New() interface{} {
+func (rs Storage) New() runtime.Object {
 	return &api.Endpoints{}
 }

pkg/registry/etcd/etcd.go

@@ -82,7 +82,7 @@ func (r *Registry) ListPods(selector labels.Selector) (*api.PodList, error) {
 
 // WatchPods begins watching for new, changed, or deleted pods.
 func (r *Registry) WatchPods(resourceVersion uint64, filter func(*api.Pod) bool) (watch.Interface, error) {
-	return r.WatchList("/registry/pods", resourceVersion, func(obj interface{}) bool {
+	return r.WatchList("/registry/pods", resourceVersion, func(obj runtime.Object) bool {
 		pod, ok := obj.(*api.Pod)
 		if !ok {
 			glog.Errorf("Unexpected object during pod watch: %#v", obj)
@@ -110,14 +110,14 @@ func makeContainerKey(machine string) string {
 }
 
 // CreatePod creates a pod based on a specification.
-func (r *Registry) CreatePod(pod api.Pod) error {
+func (r *Registry) CreatePod(pod *api.Pod) error {
 	// Set current status to "Waiting".
 	pod.CurrentState.Status = api.PodWaiting
 	pod.CurrentState.Host = ""
 	// DesiredState.Host == "" is a signal to the scheduler that this pod needs scheduling.
 	pod.DesiredState.Status = api.PodRunning
 	pod.DesiredState.Host = ""
-	return r.CreateObj(makePodKey(pod.ID), &pod)
+	return r.CreateObj(makePodKey(pod.ID), pod)
 }
 
 // ApplyBinding implements binding's registry
@@ -129,7 +129,7 @@ func (r *Registry) ApplyBinding(binding *api.Binding) error {
 // Returns the current state of the pod, or an error.
 func (r *Registry) setPodHostTo(podID, oldMachine, machine string) (finalPod *api.Pod, err error) {
 	podKey := makePodKey(podID)
-	err = r.AtomicUpdate(podKey, &api.Pod{}, func(obj interface{}) (interface{}, error) {
+	err = r.AtomicUpdate(podKey, &api.Pod{}, func(obj runtime.Object) (runtime.Object, error) {
 		pod, ok := obj.(*api.Pod)
 		if !ok {
 			return nil, fmt.Errorf("unexpected object: %#v", obj)
@@ -156,13 +156,13 @@ func (r *Registry) assignPod(podID string, machine string) error {
 		return err
 	}
 	contKey := makeContainerKey(machine)
-	err = r.AtomicUpdate(contKey, &api.ContainerManifestList{}, func(in interface{}) (interface{}, error) {
+	err = r.AtomicUpdate(contKey, &api.ContainerManifestList{}, func(in runtime.Object) (runtime.Object, error) {
 		manifests := *in.(*api.ContainerManifestList)
 		manifests.Items = append(manifests.Items, manifest)
 		if !constraint.Allowed(manifests.Items) {
 			return nil, fmt.Errorf("The assignment would cause a constraint violation")
 		}
-		return manifests, nil
+		return &manifests, nil
 	})
 	if err != nil {
 		// Put the pod's host back the way it was. This is a terrible hack that
@@ -174,7 +174,7 @@ func (r *Registry) assignPod(podID string, machine string) error {
 	return err
 }
 
-func (r *Registry) UpdatePod(pod api.Pod) error {
+func (r *Registry) UpdatePod(pod *api.Pod) error {
 	return fmt.Errorf("unimplemented!")
 }
 
@@ -205,7 +205,7 @@ func (r *Registry) DeletePod(podID string) error {
 	}
 	// Next, remove the pod from the machine atomically.
 	contKey := makeContainerKey(machine)
-	return r.AtomicUpdate(contKey, &api.ContainerManifestList{}, func(in interface{}) (interface{}, error) {
+	return r.AtomicUpdate(contKey, &api.ContainerManifestList{}, func(in runtime.Object) (runtime.Object, error) {
 		manifests := in.(*api.ContainerManifestList)
 		newManifests := make([]api.ContainerManifest, 0, len(manifests.Items))
 		found := false
@@ -258,7 +258,7 @@ func (r *Registry) GetController(controllerID string) (*api.ReplicationControlle
 }
 
 // CreateController creates a new ReplicationController.
-func (r *Registry) CreateController(controller api.ReplicationController) error {
+func (r *Registry) CreateController(controller *api.ReplicationController) error {
 	err := r.CreateObj(makeControllerKey(controller.ID), controller)
 	if tools.IsEtcdNodeExist(err) {
 		return errors.NewAlreadyExists("replicationController", controller.ID)
@@ -267,8 +267,8 @@ func (r *Registry) CreateController(controller api.ReplicationController) error
 }
 
 // UpdateController replaces an existing ReplicationController.
-func (r *Registry) UpdateController(controller api.ReplicationController) error {
-	return r.SetObj(makeControllerKey(controller.ID), &controller)
+func (r *Registry) UpdateController(controller *api.ReplicationController) error {
+	return r.SetObj(makeControllerKey(controller.ID), controller)
 }
 
 // DeleteController deletes a ReplicationController specified by its ID.
@@ -293,7 +293,7 @@ func (r *Registry) ListServices() (*api.ServiceList, error) {
 }
 
 // CreateService creates a new Service.
-func (r *Registry) CreateService(svc api.Service) error {
+func (r *Registry) CreateService(svc *api.Service) error {
 	err := r.CreateObj(makeServiceKey(svc.ID), svc)
 	if tools.IsEtcdNodeExist(err) {
 		return errors.NewAlreadyExists("service", svc.ID)
@@ -352,8 +352,8 @@ func (r *Registry) DeleteService(name string) error {
 }
 
 // UpdateService replaces an existing Service.
-func (r *Registry) UpdateService(svc api.Service) error {
-	return r.SetObj(makeServiceKey(svc.ID), &svc)
+func (r *Registry) UpdateService(svc *api.Service) error {
+	return r.SetObj(makeServiceKey(svc.ID), svc)
 }
 
 // WatchServices begins watching for new, changed, or deleted service configurations.
@@ -378,10 +378,10 @@ func (r *Registry) ListEndpoints() (*api.EndpointsList, error) {
 }
 
 // UpdateEndpoints update Endpoints of a Service.
-func (r *Registry) UpdateEndpoints(e api.Endpoints) error {
+func (r *Registry) UpdateEndpoints(e *api.Endpoints) error {
 	// TODO: this is a really bad misuse of AtomicUpdate, need to compute a diff inside the loop.
 	return r.AtomicUpdate(makeServiceEndpointsKey(e.ID), &api.Endpoints{},
-		func(input interface{}) (interface{}, error) {
+		func(input runtime.Object) (runtime.Object, error) {
 			// TODO: racy - label query is returning different results for two simultaneous updaters
 			return e, nil
 		})

pkg/registry/minion/storage.go

@@ -22,6 +22,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
@@ -37,7 +38,7 @@ func NewRegistryStorage(m Registry) apiserver.RESTStorage {
 	}
 }
 
-func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	minion, ok := obj.(*api.Minion)
 	if !ok {
 		return nil, fmt.Errorf("not a minion: %#v", obj)
@@ -48,7 +49,7 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 
 	minion.CreationTimestamp = util.Now()
 
-	return apiserver.MakeAsync(func() (interface{}, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		err := rs.registry.Insert(minion.ID)
 		if err != nil {
 			return nil, err
@@ -64,7 +65,7 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 	}), nil
 }
 
-func (rs *RegistryStorage) Delete(id string) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Delete(id string) (<-chan runtime.Object, error) {
 	exists, err := rs.registry.Contains(id)
 	if !exists {
 		return nil, ErrDoesNotExist
@@ -72,12 +73,12 @@ func (rs *RegistryStorage) Delete(id string) (<-chan interface{}, error) {
 	if err != nil {
 		return nil, err
 	}
-	return apiserver.MakeAsync(func() (interface{}, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		return &api.Status{Status: api.StatusSuccess}, rs.registry.Delete(id)
 	}), nil
 }
 
-func (rs *RegistryStorage) Get(id string) (interface{}, error) {
+func (rs *RegistryStorage) Get(id string) (runtime.Object, error) {
 	exists, err := rs.registry.Contains(id)
 	if !exists {
 		return nil, ErrDoesNotExist
@@ -85,26 +86,26 @@ func (rs *RegistryStorage) Get(id string) (interface{}, error) {
 	return rs.toApiMinion(id), err
 }
 
-func (rs *RegistryStorage) List(selector labels.Selector) (interface{}, error) {
+func (rs *RegistryStorage) List(selector labels.Selector) (runtime.Object, error) {
 	nameList, err := rs.registry.List()
 	if err != nil {
 		return nil, err
 	}
 	var list api.MinionList
 	for _, name := range nameList {
-		list.Items = append(list.Items, rs.toApiMinion(name))
+		list.Items = append(list.Items, *rs.toApiMinion(name))
 	}
-	return list, nil
+	return &list, nil
 }
 
-func (rs RegistryStorage) New() interface{} {
+func (rs RegistryStorage) New() runtime.Object {
 	return &api.Minion{}
 }
 
-func (rs *RegistryStorage) Update(minion interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Update(minion runtime.Object) (<-chan runtime.Object, error) {
 	return nil, fmt.Errorf("Minions can only be created (inserted) and deleted.")
 }
 
-func (rs *RegistryStorage) toApiMinion(name string) api.Minion {
-	return api.Minion{JSONBase: api.JSONBase{ID: name}}
+func (rs *RegistryStorage) toApiMinion(name string) *api.Minion {
+	return &api.Minion{JSONBase: api.JSONBase{ID: name}}
 }

pkg/registry/pod/registry.go

@@ -31,9 +31,9 @@ type Registry interface {
 	// Get a specific pod
 	GetPod(podID string) (*api.Pod, error)
 	// Create a pod based on a specification.
-	CreatePod(pod api.Pod) error
+	CreatePod(pod *api.Pod) error
 	// Update an existing pod
-	UpdatePod(pod api.Pod) error
+	UpdatePod(pod *api.Pod) error
 	// Delete an existing pod
 	DeletePod(podID string) error
 }

pkg/registry/pod/storage.go

@@ -29,6 +29,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 
@@ -64,7 +65,7 @@ func NewRegistryStorage(config *RegistryStorageConfig) apiserver.RESTStorage {
 	}
 }
 
-func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	pod := obj.(*api.Pod)
 	if len(pod.ID) == 0 {
 		pod.ID = uuid.NewUUID().String()
@@ -76,21 +77,21 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 
 	pod.CreationTimestamp = util.Now()
 
-	return apiserver.MakeAsync(func() (interface{}, error) {
-		if err := rs.registry.CreatePod(*pod); err != nil {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
+		if err := rs.registry.CreatePod(pod); err != nil {
 			return nil, err
 		}
 		return rs.registry.GetPod(pod.ID)
 	}), nil
 }
 
-func (rs *RegistryStorage) Delete(id string) (<-chan interface{}, error) {
-	return apiserver.MakeAsync(func() (interface{}, error) {
+func (rs *RegistryStorage) Delete(id string) (<-chan runtime.Object, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		return &api.Status{Status: api.StatusSuccess}, rs.registry.DeletePod(id)
 	}), nil
 }
 
-func (rs *RegistryStorage) Get(id string) (interface{}, error) {
+func (rs *RegistryStorage) Get(id string) (runtime.Object, error) {
 	pod, err := rs.registry.GetPod(id)
 	if err != nil {
 		return pod, err
@@ -106,7 +107,7 @@ func (rs *RegistryStorage) Get(id string) (interface{}, error) {
 	return pod, err
 }
 
-func (rs *RegistryStorage) List(selector labels.Selector) (interface{}, error) {
+func (rs *RegistryStorage) List(selector labels.Selector) (runtime.Object, error) {
 	pods, err := rs.registry.ListPods(selector)
 	if err == nil {
 		for i := range pods.Items {
@@ -131,17 +132,17 @@ func (rs *RegistryStorage) Watch(label, field labels.Selector, resourceVersion u
 	})
 }
 
-func (rs RegistryStorage) New() interface{} {
+func (rs RegistryStorage) New() runtime.Object {
 	return &api.Pod{}
 }
 
-func (rs *RegistryStorage) Update(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Update(obj runtime.Object) (<-chan runtime.Object, error) {
 	pod := obj.(*api.Pod)
 	if errs := validation.ValidatePod(pod); len(errs) > 0 {
 		return nil, errors.NewInvalid("pod", pod.ID, errs)
 	}
-	return apiserver.MakeAsync(func() (interface{}, error) {
-		if err := rs.registry.UpdatePod(*pod); err != nil {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
+		if err := rs.registry.UpdatePod(pod); err != nil {
 			return nil, err
 		}
 		return rs.registry.GetPod(pod.ID)
@@ -235,7 +236,7 @@ func getPodStatus(pod *api.Pod) api.PodStatus {
 	}
 }
 
-func (rs *RegistryStorage) waitForPodRunning(pod api.Pod) (interface{}, error) {
+func (rs *RegistryStorage) waitForPodRunning(pod *api.Pod) (runtime.Object, error) {
 	for {
 		podObj, err := rs.Get(pod.ID)
 		if err != nil || podObj == nil {

pkg/registry/service/registry.go

@@ -26,10 +26,10 @@ import (
 // Registry is an interface for things that know how to store services.
 type Registry interface {
 	ListServices() (*api.ServiceList, error)
-	CreateService(svc api.Service) error
+	CreateService(svc *api.Service) error
 	GetService(name string) (*api.Service, error)
 	DeleteService(name string) error
-	UpdateService(svc api.Service) error
+	UpdateService(svc *api.Service) error
 	WatchServices(labels, fields labels.Selector, resourceVersion uint64) (watch.Interface, error)
 
 	// TODO: endpoints and their implementation should be separated, setting endpoints should be

pkg/registry/service/storage.go

@@ -29,6 +29,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/minion"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 )
@@ -49,7 +50,7 @@ func NewRegistryStorage(registry Registry, cloud cloudprovider.Interface, machin
 	}
 }
 
-func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Create(obj runtime.Object) (<-chan runtime.Object, error) {
 	srv := obj.(*api.Service)
 	if errs := validation.ValidateService(srv); len(errs) > 0 {
 		return nil, errors.NewInvalid("service", srv.ID, errs)
@@ -57,7 +58,7 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 
 	srv.CreationTimestamp = util.Now()
 
-	return apiserver.MakeAsync(func() (interface{}, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		// TODO: Consider moving this to a rectification loop, so that we make/remove external load balancers
 		// correctly no matter what http operations happen.
 		if srv.CreateExternalLoadBalancer {
@@ -85,7 +86,7 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 				return nil, err
 			}
 		}
-		err := rs.registry.CreateService(*srv)
+		err := rs.registry.CreateService(srv)
 		if err != nil {
 			return nil, err
 		}
@@ -93,18 +94,18 @@ func (rs *RegistryStorage) Create(obj interface{}) (<-chan interface{}, error) {
 	}), nil
 }
 
-func (rs *RegistryStorage) Delete(id string) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Delete(id string) (<-chan runtime.Object, error) {
 	service, err := rs.registry.GetService(id)
 	if err != nil {
 		return nil, err
 	}
-	return apiserver.MakeAsync(func() (interface{}, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		rs.deleteExternalLoadBalancer(service)
 		return &api.Status{Status: api.StatusSuccess}, rs.registry.DeleteService(id)
 	}), nil
 }
 
-func (rs *RegistryStorage) Get(id string) (interface{}, error) {
+func (rs *RegistryStorage) Get(id string) (runtime.Object, error) {
 	s, err := rs.registry.GetService(id)
 	if err != nil {
 		return nil, err
@@ -112,7 +113,7 @@ func (rs *RegistryStorage) Get(id string) (interface{}, error) {
 	return s, err
 }
 
-func (rs *RegistryStorage) List(selector labels.Selector) (interface{}, error) {
+func (rs *RegistryStorage) List(selector labels.Selector) (runtime.Object, error) {
 	list, err := rs.registry.ListServices()
 	if err != nil {
 		return nil, err
@@ -133,7 +134,7 @@ func (rs *RegistryStorage) Watch(label, field labels.Selector, resourceVersion u
 	return rs.registry.WatchServices(label, field, resourceVersion)
 }
 
-func (rs RegistryStorage) New() interface{} {
+func (rs RegistryStorage) New() runtime.Object {
 	return &api.Service{}
 }
 
@@ -155,14 +156,14 @@ func GetServiceEnvironmentVariables(registry Registry, machine string) ([]api.En
 	return result, nil
 }
 
-func (rs *RegistryStorage) Update(obj interface{}) (<-chan interface{}, error) {
+func (rs *RegistryStorage) Update(obj runtime.Object) (<-chan runtime.Object, error) {
 	srv := obj.(*api.Service)
 	if errs := validation.ValidateService(srv); len(errs) > 0 {
 		return nil, errors.NewInvalid("service", srv.ID, errs)
 	}
-	return apiserver.MakeAsync(func() (interface{}, error) {
+	return apiserver.MakeAsync(func() (runtime.Object, error) {
 		// TODO: check to see if external load balancer status changed
-		err := rs.registry.UpdateService(*srv)
+		err := rs.registry.UpdateService(srv)
 		if err != nil {
 			return nil, err
 		}

pkg/runtime/types.go

@@ -20,15 +20,6 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
-// All api types must support the Object interface. It's deliberately tiny so that this is not an onerous
-// burden. Implement it with a pointer reciever; this will allow us to use the go compiler to check the
-// one thing about our objects that it's capable of checking for us.
-type Object interface {
-	// This function is used only to enforce membership. It's never called.
-	// TODO: Consider mass rename in the future to make it do something useful.
-	IsAnAPIObject()
-}
-
 // Note that the types provided in this file are not versioned and are intended to be
 // safe to use from within all versions of every API object.
 

pkg/service/endpoints_controller.go

@@ -73,7 +73,7 @@ func (e *EndpointController) SyncServiceEndpoints() error {
 			endpoints[ix] = net.JoinHostPort(pod.CurrentState.PodIP, strconv.Itoa(port))
 		}
 		// TODO: this is totally broken, we need to compute this and store inside an AtomicUpdate loop.
-		err = e.serviceRegistry.UpdateEndpoints(api.Endpoints{
+		err = e.serviceRegistry.UpdateEndpoints(&api.Endpoints{
 			JSONBase:  api.JSONBase{ID: service.ID},
 			Endpoints: endpoints,
 		})

pkg/tools/decoder.go

@@ -22,6 +22,7 @@ import (
 	"io"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 )
 
@@ -42,7 +43,7 @@ func NewAPIEventDecoder(stream io.ReadCloser) *APIEventDecoder {
 
 // Decode blocks until it can return the next object in the stream. Returns an error
 // if the stream is closed or an object can't be decoded.
-func (d *APIEventDecoder) Decode() (action watch.EventType, object interface{}, err error) {
+func (d *APIEventDecoder) Decode() (action watch.EventType, object runtime.Object, err error) {
 	var got api.WatchEvent
 	err = d.decoder.Decode(&got)
 	if err != nil {

pkg/tools/etcd_tools.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"reflect"
 
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/coreos/go-etcd/etcd"
 )
 
@@ -38,19 +39,6 @@ var (
 	EtcdErrorValueRequired = &etcd.EtcdError{ErrorCode: EtcdErrorCodeValueRequired}
 )
 
-// Codec provides methods for transforming Etcd values into objects and back.
-type Codec interface {
-	Encode(obj interface{}) (data []byte, err error)
-	Decode(data []byte) (interface{}, error)
-	DecodeInto(data []byte, obj interface{}) error
-}
-
-// ResourceVersioner provides methods for managing object modification tracking.
-type ResourceVersioner interface {
-	SetResourceVersion(obj interface{}, version uint64) error
-	ResourceVersion(obj interface{}) (uint64, error)
-}
-
 // EtcdClient is an injectable interface for testing.
 type EtcdClient interface {
 	AddChild(key, data string, ttl uint64) (*etcd.Response, error)
@@ -77,9 +65,9 @@ type EtcdGetSet interface {
 // EtcdHelper offers common object marshalling/unmarshalling operations on an etcd client.
 type EtcdHelper struct {
 	Client EtcdGetSet
-	Codec  Codec
+	Codec  runtime.Codec
 	// optional, no atomic operations can be performed without this interface
-	ResourceVersioner ResourceVersioner
+	ResourceVersioner runtime.ResourceVersioner
 }
 
 // IsEtcdNotFound returns true iff err is an etcd not found error.
@@ -151,9 +139,9 @@ func (h *EtcdHelper) ExtractList(key string, slicePtr interface{}, resourceVersi
 	v := pv.Elem()
 	for _, node := range nodes {
 		obj := reflect.New(v.Type().Elem())
-		err = h.Codec.DecodeInto([]byte(node.Value), obj.Interface())
+		err = h.Codec.DecodeInto([]byte(node.Value), obj.Interface().(runtime.Object))
 		if h.ResourceVersioner != nil {
-			_ = h.ResourceVersioner.SetResourceVersion(obj.Interface(), node.ModifiedIndex)
+			_ = h.ResourceVersioner.SetResourceVersion(obj.Interface().(runtime.Object), node.ModifiedIndex)
 			// being unable to set the version does not prevent the object from being extracted
 		}
 		if err != nil {
@@ -167,12 +155,12 @@ func (h *EtcdHelper) ExtractList(key string, slicePtr interface{}, resourceVersi
 // ExtractObj unmarshals json found at key into objPtr. On a not found error, will either return
 // a zero object of the requested type, or an error, depending on ignoreNotFound. Treats
 // empty responses and nil response nodes exactly like a not found error.
-func (h *EtcdHelper) ExtractObj(key string, objPtr interface{}, ignoreNotFound bool) error {
+func (h *EtcdHelper) ExtractObj(key string, objPtr runtime.Object, ignoreNotFound bool) error {
 	_, _, err := h.bodyAndExtractObj(key, objPtr, ignoreNotFound)
 	return err
 }
 
-func (h *EtcdHelper) bodyAndExtractObj(key string, objPtr interface{}, ignoreNotFound bool) (body string, modifiedIndex uint64, err error) {
+func (h *EtcdHelper) bodyAndExtractObj(key string, objPtr runtime.Object, ignoreNotFound bool) (body string, modifiedIndex uint64, err error) {
 	response, err := h.Client.Get(key, false, false)
 
 	if err != nil && !IsEtcdNotFound(err) {
@@ -198,7 +186,7 @@ func (h *EtcdHelper) bodyAndExtractObj(key string, objPtr interface{}, ignoreNot
 }
 
 // CreateObj adds a new object at a key unless it already exists.
-func (h *EtcdHelper) CreateObj(key string, obj interface{}) error {
+func (h *EtcdHelper) CreateObj(key string, obj runtime.Object) error {
 	data, err := h.Codec.Encode(obj)
 	if err != nil {
 		return err
@@ -221,7 +209,7 @@ func (h *EtcdHelper) Delete(key string, recursive bool) error {
 
 // SetObj marshals obj via json, and stores under key. Will do an
 // atomic update if obj's ResourceVersion field is set.
-func (h *EtcdHelper) SetObj(key string, obj interface{}) error {
+func (h *EtcdHelper) SetObj(key string, obj runtime.Object) error {
 	data, err := h.Codec.Encode(obj)
 	if err != nil {
 		return err
@@ -240,7 +228,7 @@ func (h *EtcdHelper) SetObj(key string, obj interface{}) error {
 
 // Pass an EtcdUpdateFunc to EtcdHelper.AtomicUpdate to make an atomic etcd update.
 // See the comment for AtomicUpdate for more detail.
-type EtcdUpdateFunc func(input interface{}) (output interface{}, err error)
+type EtcdUpdateFunc func(input runtime.Object) (output runtime.Object, err error)
 
 // AtomicUpdate generalizes the pattern that allows for making atomic updates to etcd objects.
 // Note, tryUpdate may be called more than once.
@@ -248,7 +236,7 @@ type EtcdUpdateFunc func(input interface{}) (output interface{}, err error)
 // Example:
 //
 // h := &util.EtcdHelper{client, encoding, versioning}
-// err := h.AtomicUpdate("myKey", &MyType{}, func(input interface{}) (interface{}, error) {
+// err := h.AtomicUpdate("myKey", &MyType{}, func(input runtime.Object) (runtime.Object, error) {
 //	// Before this function is called, currentObj has been reset to etcd's current
 //	// contents for "myKey".
 //
@@ -261,14 +249,14 @@ type EtcdUpdateFunc func(input interface{}) (output interface{}, err error)
 //	return cur, nil
 // })
 //
-func (h *EtcdHelper) AtomicUpdate(key string, ptrToType interface{}, tryUpdate EtcdUpdateFunc) error {
+func (h *EtcdHelper) AtomicUpdate(key string, ptrToType runtime.Object, tryUpdate EtcdUpdateFunc) error {
 	pt := reflect.TypeOf(ptrToType)
 	if pt.Kind() != reflect.Ptr {
 		// Panic is appropriate, because this is a programming error.
 		panic("need ptr to type")
 	}
 	for {
-		obj := reflect.New(pt.Elem()).Interface()
+		obj := reflect.New(pt.Elem()).Interface().(runtime.Object)
 		origBody, index, err := h.bodyAndExtractObj(key, obj, true)
 		if err != nil {
 			return err

pkg/tools/etcd_tools_watch.go

@@ -19,6 +19,7 @@ package tools
 import (
 	"sync"
 
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 	"github.com/coreos/go-etcd/etcd"
@@ -27,10 +28,10 @@ import (
 
 // FilterFunc is a predicate which takes an API object and returns true
 // iff the object should remain in the set.
-type FilterFunc func(obj interface{}) bool
+type FilterFunc func(obj runtime.Object) bool
 
 // Everything is a FilterFunc which accepts all objects.
-func Everything(interface{}) bool {
+func Everything(runtime.Object) bool {
 	return true
 }
 
@@ -59,7 +60,7 @@ func (h *EtcdHelper) Watch(key string, resourceVersion uint64) (watch.Interface,
 // change or wrap the serialized etcd object.
 //
 //   startTime := time.Now()
-//   helper.WatchAndTransform(key, version, func(input interface{}) (interface{}, error) {
+//   helper.WatchAndTransform(key, version, func(input runtime.Object) (runtime.Object, error) {
 //     value := input.(TimeAwareValue)
 //     value.Since = startTime
 //     return value, nil
@@ -72,12 +73,12 @@ func (h *EtcdHelper) WatchAndTransform(key string, resourceVersion uint64, trans
 }
 
 // TransformFunc attempts to convert an object to another object for use with a watcher.
-type TransformFunc func(interface{}) (interface{}, error)
+type TransformFunc func(runtime.Object) (runtime.Object, error)
 
 // etcdWatcher converts a native etcd watch to a watch.Interface.
 type etcdWatcher struct {
-	encoding  Codec
-	versioner ResourceVersioner
+	encoding  runtime.Codec
+	versioner runtime.ResourceVersioner
 	transform TransformFunc
 
 	list   bool // If we're doing a recursive watch, should be true.
@@ -98,7 +99,7 @@ type etcdWatcher struct {
 
 // newEtcdWatcher returns a new etcdWatcher; if list is true, watch sub-nodes.  If you provide a transform
 // and a versioner, the versioner must be able to handle the objects that transform creates.
-func newEtcdWatcher(list bool, filter FilterFunc, encoding Codec, versioner ResourceVersioner, transform TransformFunc) *etcdWatcher {
+func newEtcdWatcher(list bool, filter FilterFunc, encoding runtime.Codec, versioner runtime.ResourceVersioner, transform TransformFunc) *etcdWatcher {
 	w := &etcdWatcher{
 		encoding:      encoding,
 		versioner:     versioner,
@@ -192,7 +193,7 @@ func (w *etcdWatcher) translate() {
 	}
 }
 
-func (w *etcdWatcher) decodeObject(data []byte, index uint64) (interface{}, error) {
+func (w *etcdWatcher) decodeObject(data []byte, index uint64) (runtime.Object, error) {
 	obj, err := w.encoding.Decode(data)
 	if err != nil {
 		return nil, err
@@ -260,7 +261,7 @@ func (w *etcdWatcher) sendModify(res *etcd.Response) {
 	}
 	curObjPasses := w.filter(curObj)
 	oldObjPasses := false
-	var oldObj interface{}
+	var oldObj runtime.Object
 	if res.PrevNode != nil && res.PrevNode.Value != "" {
 		// Ignore problems reading the old object.
 		if oldObj, err = w.decodeObject([]byte(res.PrevNode.Value), res.PrevNode.ModifiedIndex); err == nil {

pkg/watch/iowatcher.go

@@ -19,6 +19,7 @@ package watch
 import (
 	"sync"
 
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
 
@@ -27,7 +28,7 @@ type Decoder interface {
 	// Decode should return the type of event, the decoded object, or an error.
 	// An error will cause StreamWatcher to call Close(). Decode should block until
 	// it has data or an error occurs.
-	Decode() (action EventType, object interface{}, err error)
+	Decode() (action EventType, object runtime.Object, err error)
 
 	// Close should close the underlying io.Reader, signalling to the source of
 	// the stream that it is no longer being watched. Close() must cause any

pkg/watch/mux.go

@@ -18,6 +18,8 @@ package watch
 
 import (
 	"sync"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 )
 
 // Mux distributes event notifications among any number of watchers. Every event
@@ -88,7 +90,7 @@ func (m *Mux) closeAll() {
 }
 
 // Action distributes the given event among all watchers.
-func (m *Mux) Action(action EventType, obj interface{}) {
+func (m *Mux) Action(action EventType, obj runtime.Object) {
 	m.incoming <- Event{action, obj}
 }
 

pkg/watch/mux_test.go

@@ -22,16 +22,19 @@ import (
 	"testing"
 )
 
+type myType struct {
+	ID    string
+	Value string
+}
+
+func (*myType) IsAnAPIObject() {}
+
 func TestMux(t *testing.T) {
-	type myType struct {
-		ID    string
-		Value string
-	}
 	table := []Event{
-		{Added, myType{"foo", "hello world 1"}},
-		{Added, myType{"bar", "hello world 2"}},
-		{Modified, myType{"foo", "goodbye world 3"}},
-		{Deleted, myType{"bar", "hello world 4"}},
+		{Added, &myType{"foo", "hello world 1"}},
+		{Added, &myType{"bar", "hello world 2"}},
+		{Modified, &myType{"foo", "goodbye world 3"}},
+		{Deleted, &myType{"bar", "hello world 4"}},
 	}
 
 	// The mux we're testing

pkg/watch/watch.go

@@ -18,6 +18,8 @@ package watch
 
 import (
 	"sync"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 )
 
 // Interface can be implemented by anything that knows how to watch and report changes.
@@ -47,7 +49,7 @@ type Event struct {
 
 	// If Type == Deleted, then this is the state of the object
 	// immediately before deletion.
-	Object interface{}
+	Object runtime.Object
 }
 
 // FakeWatcher lets you test anything that consumes a watch.Interface; threadsafe.
@@ -78,21 +80,21 @@ func (f *FakeWatcher) ResultChan() <-chan Event {
 }
 
 // Add sends an add event.
-func (f *FakeWatcher) Add(obj interface{}) {
+func (f *FakeWatcher) Add(obj runtime.Object) {
 	f.result <- Event{Added, obj}
 }
 
 // Modify sends a modify event.
-func (f *FakeWatcher) Modify(obj interface{}) {
+func (f *FakeWatcher) Modify(obj runtime.Object) {
 	f.result <- Event{Modified, obj}
 }
 
 // Delete sends a delete event.
-func (f *FakeWatcher) Delete(lastValue interface{}) {
+func (f *FakeWatcher) Delete(lastValue runtime.Object) {
 	f.result <- Event{Deleted, lastValue}
 }
 
 // Action sends an event of the requested type, for table-based testing.
-func (f *FakeWatcher) Action(action EventType, obj interface{}) {
+func (f *FakeWatcher) Action(action EventType, obj runtime.Object) {
 	f.result <- Event{action, obj}
 }