Add status subresource to HorizontalPodAutoscaler

pkg/apis/extensions/validation/validation.go

@@ -51,6 +51,19 @@ func ValidateHorizontalPodAutoscalerName(name string, prefix bool) (bool, string
 	return apivalidation.ValidateReplicationControllerName(name, prefix)
 }
 
+func validateResourceConsumption(consumption *extensions.ResourceConsumption, fieldName string) errs.ValidationErrorList {
+	allErrs := errs.ValidationErrorList{}
+	resource := consumption.Resource.String()
+	if resource != string(api.ResourceMemory) && resource != string(api.ResourceCPU) {
+		allErrs = append(allErrs, errs.NewFieldInvalid(fieldName+".resource", resource, "resource not supported by autoscaler"))
+	}
+	quantity := consumption.Quantity.Value()
+	if quantity < 0 {
+		allErrs = append(allErrs, errs.NewFieldInvalid(fieldName+".quantity", quantity, "must be non-negative"))
+	}
+	return allErrs
+}
+
 func validateHorizontalPodAutoscalerSpec(autoscaler extensions.HorizontalPodAutoscalerSpec) errs.ValidationErrorList {
 	allErrs := errs.ValidationErrorList{}
 	if autoscaler.MinReplicas < 0 {
@@ -87,6 +100,19 @@ func ValidateHorizontalPodAutoscalerUpdate(newAutoscler, oldAutoscaler *extensio
 	return allErrs
 }
 
+func ValidateHorizontalPodAutoscalerStatusUpdate(controller, oldController *extensions.HorizontalPodAutoscaler) errs.ValidationErrorList {
+	allErrs := errs.ValidationErrorList{}
+	allErrs = append(allErrs, apivalidation.ValidateObjectMetaUpdate(&controller.ObjectMeta, &oldController.ObjectMeta).Prefix("metadata")...)
+
+	status := controller.Status
+	allErrs = append(allErrs, apivalidation.ValidatePositiveField(int64(status.CurrentReplicas), "currentReplicas")...)
+	allErrs = append(allErrs, apivalidation.ValidatePositiveField(int64(status.DesiredReplicas), "desiredReplicas")...)
+	if status.CurrentConsumption != nil {
+		allErrs = append(allErrs, validateResourceConsumption(status.CurrentConsumption, "currentConsumption")...)
+	}
+	return allErrs
+}
+
 func ValidateThirdPartyResourceUpdate(old, update *extensions.ThirdPartyResource) errs.ValidationErrorList {
 	return ValidateThirdPartyResource(update)
 }

pkg/client/unversioned/horizontalpodautoscaler.go

@@ -36,6 +36,7 @@ type HorizontalPodAutoscalerInterface interface {
 	Delete(name string, options *api.DeleteOptions) error
 	Create(horizontalPodAutoscaler *extensions.HorizontalPodAutoscaler) (*extensions.HorizontalPodAutoscaler, error)
 	Update(horizontalPodAutoscaler *extensions.HorizontalPodAutoscaler) (*extensions.HorizontalPodAutoscaler, error)
+	UpdateStatus(horizontalPodAutoscaler *extensions.HorizontalPodAutoscaler) (*extensions.HorizontalPodAutoscaler, error)
 	Watch(label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error)
 }
 
@@ -94,6 +95,13 @@ func (c *horizontalPodAutoscalers) Update(horizontalPodAutoscaler *extensions.Ho
 	return
 }
 
+// UpdateStatus takes the representation of a horizontalPodAutoscaler and updates it.  Returns the server's representation of the horizontalPodAutoscaler, and an error, if it occurs.
+func (c *horizontalPodAutoscalers) UpdateStatus(horizontalPodAutoscaler *extensions.HorizontalPodAutoscaler) (result *extensions.HorizontalPodAutoscaler, err error) {
+	result = &extensions.HorizontalPodAutoscaler{}
+	err = c.client.Put().Namespace(c.ns).Resource("horizontalPodAutoscalers").Name(horizontalPodAutoscaler.Name).SubResource("status").Body(horizontalPodAutoscaler).Do().Into(result)
+	return
+}
+
 // Watch returns a watch.Interface that watches the requested horizontalPodAutoscalers.
 func (c *horizontalPodAutoscalers) Watch(label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
 	return c.client.Get().

pkg/client/unversioned/horizontalpodautoscaler_test.go

@@ -120,6 +120,23 @@ func TestHorizontalPodAutoscalerUpdate(t *testing.T) {
 	c.Validate(t, response, err)
 }
 
+func TestHorizontalPodAutoscalerUpdateStatus(t *testing.T) {
+	ns := api.NamespaceDefault
+	horizontalPodAutoscaler := &extensions.HorizontalPodAutoscaler{
+		ObjectMeta: api.ObjectMeta{
+			Name:            "abc",
+			Namespace:       ns,
+			ResourceVersion: "1",
+		},
+	}
+	c := &testClient{
+		Request:  testRequest{Method: "PUT", Path: testapi.Extensions.ResourcePath(getHorizontalPodAutoscalersResoureName(), ns, "abc") + "/status", Query: buildQueryValues(nil)},
+		Response: Response{StatusCode: 200, Body: horizontalPodAutoscaler},
+	}
+	response, err := c.Setup(t).Experimental().HorizontalPodAutoscalers(ns).UpdateStatus(horizontalPodAutoscaler)
+	c.Validate(t, response, err)
+}
+
 func TestHorizontalPodAutoscalerDelete(t *testing.T) {
 	ns := api.NamespaceDefault
 	c := &testClient{

pkg/client/unversioned/testclient/fake_horizontal_pod_autoscalers.go

@@ -72,6 +72,14 @@ func (c *FakeHorizontalPodAutoscalers) Update(a *extensions.HorizontalPodAutosca
 	return obj.(*extensions.HorizontalPodAutoscaler), err
 }
 
+func (c *FakeHorizontalPodAutoscalers) UpdateStatus(a *extensions.HorizontalPodAutoscaler) (*extensions.HorizontalPodAutoscaler, error) {
+	obj, err := c.Fake.Invokes(NewUpdateSubresourceAction("horizontalpodautoscalers", "status", c.Namespace, a), &extensions.HorizontalPodAutoscaler{})
+	if obj == nil {
+		return nil, err
+	}
+	return obj.(*extensions.HorizontalPodAutoscaler), err
+}
+
 func (c *FakeHorizontalPodAutoscalers) Delete(name string, options *api.DeleteOptions) error {
 	_, err := c.Fake.Invokes(NewDeleteAction("horizontalpodautoscalers", c.Namespace, name), &extensions.HorizontalPodAutoscaler{})
 	return err

pkg/controller/podautoscaler/horizontal.go

@@ -147,7 +147,7 @@ func (a *HorizontalController) reconcileAutoscaler(hpa extensions.HorizontalPodA
 		hpa.Status.LastScaleTimestamp = &now
 	}
 
-	_, err = a.client.Experimental().HorizontalPodAutoscalers(hpa.Namespace).Update(&hpa)
+	_, err = a.client.Experimental().HorizontalPodAutoscalers(hpa.Namespace).UpdateStatus(&hpa)
 	if err != nil {
 		a.eventRecorder.Event(&hpa, "FailedUpdateStatus", err.Error())
 		return fmt.Errorf("failed to update status for %s: %v", hpa.Name, err)

pkg/master/master.go

@@ -1042,7 +1042,7 @@ func (m *Master) experimental(c *Config) *apiserver.APIGroupVersion {
 	dbClient := func(resource string) storage.Interface {
 		return c.StorageDestinations.get("extensions", resource)
 	}
-	autoscalerStorage := horizontalpodautoscaleretcd.NewREST(dbClient("horizonalpodautoscalers"))
+	autoscalerStorage, autoscalerStatusStorage := horizontalpodautoscaleretcd.NewREST(dbClient("horizonalpodautoscalers"))
 	thirdPartyResourceStorage := thirdpartyresourceetcd.NewREST(dbClient("thirdpartyresources"))
 	daemonSetStorage, daemonSetStatusStorage := daemonetcd.NewREST(dbClient("daemonsets"))
 	deploymentStorage := deploymentetcd.NewStorage(dbClient("deployments"))
@@ -1061,17 +1061,18 @@ func (m *Master) experimental(c *Config) *apiserver.APIGroupVersion {
 		}, 10*time.Second)
 	}()
 	storage := map[string]rest.Storage{
-		strings.ToLower("replicationControllers"):       controllerStorage.ReplicationController,
-		strings.ToLower("replicationControllers/scale"): controllerStorage.Scale,
-		strings.ToLower("horizontalpodautoscalers"):     autoscalerStorage,
-		strings.ToLower("thirdpartyresources"):          thirdPartyResourceStorage,
-		strings.ToLower("daemonsets"):                   daemonSetStorage,
-		strings.ToLower("daemonsets/status"):            daemonSetStatusStorage,
-		strings.ToLower("deployments"):                  deploymentStorage.Deployment,
-		strings.ToLower("deployments/scale"):            deploymentStorage.Scale,
-		strings.ToLower("jobs"):                         jobStorage,
-		strings.ToLower("jobs/status"):                  jobStatusStorage,
-		strings.ToLower("ingress"):                      ingressStorage,
+		strings.ToLower("replicationControllers"):          controllerStorage.ReplicationController,
+		strings.ToLower("replicationControllers/scale"):    controllerStorage.Scale,
+		strings.ToLower("horizontalpodautoscalers"):        autoscalerStorage,
+		strings.ToLower("horizontalpodautoscalers/status"): autoscalerStatusStorage,
+		strings.ToLower("thirdpartyresources"):             thirdPartyResourceStorage,
+		strings.ToLower("daemonsets"):                      daemonSetStorage,
+		strings.ToLower("daemonsets/status"):               daemonSetStatusStorage,
+		strings.ToLower("deployments"):                     deploymentStorage.Deployment,
+		strings.ToLower("deployments/scale"):               deploymentStorage.Scale,
+		strings.ToLower("jobs"):                            jobStorage,
+		strings.ToLower("jobs/status"):                     jobStatusStorage,
+		strings.ToLower("ingress"):                         ingressStorage,
 	}
 
 	expMeta := latest.GroupOrDie("extensions")

pkg/registry/horizontalpodautoscaler/etcd/etcd.go

@@ -33,7 +33,7 @@ type REST struct {
 }
 
 // NewREST returns a RESTStorage object that will work against horizontal pod autoscalers.
-func NewREST(s storage.Interface) *REST {
+func NewREST(s storage.Interface) (*REST, *StatusREST) {
 	prefix := "/horizontalpodautoscalers"
 	store := &etcdgeneric.Etcd{
 		NewFunc: func() runtime.Object { return &extensions.HorizontalPodAutoscaler{} },
@@ -67,5 +67,21 @@ func NewREST(s storage.Interface) *REST {
 
 		Storage: s,
 	}
-	return &REST{store}
+	statusStore := *store
+	statusStore.UpdateStrategy = horizontalpodautoscaler.StatusStrategy
+	return &REST{store}, &StatusREST{store: &statusStore}
+}
+
+// StatusREST implements the REST endpoint for changing the status of a daemonset
+type StatusREST struct {
+	store *etcdgeneric.Etcd
+}
+
+func (r *StatusREST) New() runtime.Object {
+	return &extensions.HorizontalPodAutoscaler{}
+}
+
+// Update alters the status subset of an object.
+func (r *StatusREST) Update(ctx api.Context, obj runtime.Object) (runtime.Object, bool, error) {
+	return r.store.Update(ctx, obj)
 }

pkg/registry/horizontalpodautoscaler/etcd/etcd_test.go

@@ -31,9 +31,10 @@ import (
 	"k8s.io/kubernetes/pkg/tools"
 )
 
-func newStorage(t *testing.T) (*REST, *tools.FakeEtcdClient) {
+func newStorage(t *testing.T) (*REST, *StatusREST, *tools.FakeEtcdClient) {
 	etcdStorage, fakeClient := registrytest.NewEtcdStorage(t, "extensions")
-	return NewREST(etcdStorage), fakeClient
+	storage, statusStorage := NewREST(etcdStorage)
+	return storage, statusStorage, fakeClient
 }
 
 func validNewHorizontalPodAutoscaler(name string) *extensions.HorizontalPodAutoscaler {
@@ -54,7 +55,7 @@ func validNewHorizontalPodAutoscaler(name string) *extensions.HorizontalPodAutos
 }
 
 func TestCreate(t *testing.T) {
-	storage, fakeClient := newStorage(t)
+	storage, _, fakeClient := newStorage(t)
 	test := registrytest.New(t, fakeClient, storage.Etcd)
 	autoscaler := validNewHorizontalPodAutoscaler("foo")
 	autoscaler.ObjectMeta = api.ObjectMeta{}
@@ -67,7 +68,7 @@ func TestCreate(t *testing.T) {
 }
 
 func TestUpdate(t *testing.T) {
-	storage, fakeClient := newStorage(t)
+	storage, _, fakeClient := newStorage(t)
 	test := registrytest.New(t, fakeClient, storage.Etcd)
 	test.TestUpdate(
 		// valid
@@ -82,25 +83,25 @@ func TestUpdate(t *testing.T) {
 }
 
 func TestDelete(t *testing.T) {
-	storage, fakeClient := newStorage(t)
+	storage, _, fakeClient := newStorage(t)
 	test := registrytest.New(t, fakeClient, storage.Etcd)
 	test.TestDelete(validNewHorizontalPodAutoscaler("foo"))
 }
 
 func TestGet(t *testing.T) {
-	storage, fakeClient := newStorage(t)
+	storage, _, fakeClient := newStorage(t)
 	test := registrytest.New(t, fakeClient, storage.Etcd)
 	test.TestGet(validNewHorizontalPodAutoscaler("foo"))
 }
 
 func TestList(t *testing.T) {
-	storage, fakeClient := newStorage(t)
+	storage, _, fakeClient := newStorage(t)
 	test := registrytest.New(t, fakeClient, storage.Etcd)
 	test.TestList(validNewHorizontalPodAutoscaler("foo"))
 }
 
 func TestWatch(t *testing.T) {
-	storage, fakeClient := newStorage(t)
+	storage, _, fakeClient := newStorage(t)
 	test := registrytest.New(t, fakeClient, storage.Etcd)
 	test.TestWatch(
 		validNewHorizontalPodAutoscaler("foo"),
@@ -119,3 +120,5 @@ func TestWatch(t *testing.T) {
 		},
 	)
 }
+
+// TODO TestUpdateStatus

pkg/registry/horizontalpodautoscaler/strategy.go

@@ -46,7 +46,10 @@ func (autoscalerStrategy) NamespaceScoped() bool {
 
 // PrepareForCreate clears fields that are not allowed to be set by end users on creation.
 func (autoscalerStrategy) PrepareForCreate(obj runtime.Object) {
-	_ = obj.(*extensions.HorizontalPodAutoscaler)
+	newHPA := obj.(*extensions.HorizontalPodAutoscaler)
+
+	// create cannot set status
+	newHPA.Status = extensions.HorizontalPodAutoscalerStatus{}
 }
 
 // Validate validates a new autoscaler.
@@ -62,7 +65,10 @@ func (autoscalerStrategy) AllowCreateOnUpdate() bool {
 
 // PrepareForUpdate clears fields that are not allowed to be set by end users on update.
 func (autoscalerStrategy) PrepareForUpdate(obj, old runtime.Object) {
-	_ = obj.(*extensions.HorizontalPodAutoscaler)
+	newHPA := obj.(*extensions.HorizontalPodAutoscaler)
+	oldHPA := obj.(*extensions.HorizontalPodAutoscaler)
+	// Update is not allowed to set status
+	newHPA.Status = oldHPA.Status
 }
 
 // ValidateUpdate is the default update validation for an end user.
@@ -91,3 +97,20 @@ func MatchAutoscaler(label labels.Selector, field fields.Selector) generic.Match
 		},
 	}
 }
+
+type autoscalerStatusStrategy struct {
+	autoscalerStrategy
+}
+
+var StatusStrategy = autoscalerStatusStrategy{Strategy}
+
+func (autoscalerStatusStrategy) PrepareForUpdate(obj, old runtime.Object) {
+	newAutoscaler := obj.(*extensions.HorizontalPodAutoscaler)
+	oldAutoscaler := old.(*extensions.HorizontalPodAutoscaler)
+	// status changes are not allowed to update spec
+	newAutoscaler.Spec = oldAutoscaler.Spec
+}
+
+func (autoscalerStatusStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) errs.ValidationErrorList {
+	return validation.ValidateHorizontalPodAutoscalerStatusUpdate(obj.(*extensions.HorizontalPodAutoscaler), old.(*extensions.HorizontalPodAutoscaler))
+}