Golang meta.Accessor函數代碼示例

func TestControllerRoleLabel(t *testing.T) {
	roles := ControllerRoles()
	for i := range roles {
		role := roles[i]
		accessor, err := meta.Accessor(&role)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got, want := accessor.GetLabels(), map[string]string{"kubernetes.io/bootstrapping": "rbac-defaults"}; !reflect.DeepEqual(got, want) {
			t.Errorf("ClusterRole: %s GetLabels() = %s, want %s", accessor.GetName(), got, want)
		}
	}

	rolebindings := ControllerRoleBindings()
	for i := range rolebindings {
		rolebinding := rolebindings[i]
		accessor, err := meta.Accessor(&rolebinding)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got, want := accessor.GetLabels(), map[string]string{"kubernetes.io/bootstrapping": "rbac-defaults"}; !reflect.DeepEqual(got, want) {
			t.Errorf("ClusterRoleBinding: %s GetLabels() = %s, want %s", accessor.GetName(), got, want)
		}
	}
}

func isChangingOwnerReference(newObj, oldObj runtime.Object) bool {
	newMeta, err := meta.Accessor(newObj)
	if err != nil {
		// if we don't have objectmeta, we don't have the object reference
		return false
	}

	if oldObj == nil {
		return len(newMeta.GetOwnerReferences()) > 0
	}
	oldMeta, err := meta.Accessor(oldObj)
	if err != nil {
		// if we don't have objectmeta, we don't have the object reference
		return false
	}

	// compare the old and new.  If they aren't the same, then we're trying to change an ownerRef
	oldOwners := oldMeta.GetOwnerReferences()
	newOwners := newMeta.GetOwnerReferences()
	if len(oldOwners) != len(newOwners) {
		return true
	}
	for i := range oldOwners {
		if !api.Semantic.DeepEqual(oldOwners[i], newOwners[i]) {
			return true
		}
	}

	return false
}

func annotateRuntimeObject(t *testing.T, originalObj, currentObj runtime.Object, kind string) (string, []byte) {
	originalAccessor, err := meta.Accessor(originalObj)
	if err != nil {
		t.Fatal(err)
	}

	originalLabels := originalAccessor.GetLabels()
	originalLabels["DELETE_ME"] = "DELETE_ME"
	originalAccessor.SetLabels(originalLabels)
	original, err := runtime.Encode(testapi.Default.Codec(), originalObj)
	if err != nil {
		t.Fatal(err)
	}

	currentAccessor, err := meta.Accessor(currentObj)
	if err != nil {
		t.Fatal(err)
	}

	currentAnnotations := currentAccessor.GetAnnotations()
	if currentAnnotations == nil {
		currentAnnotations = make(map[string]string)
	}
	currentAnnotations[annotations.LastAppliedConfigAnnotation] = string(original)
	currentAccessor.SetAnnotations(currentAnnotations)
	current, err := runtime.Encode(testapi.Default.Codec(), currentObj)
	if err != nil {
		t.Fatal(err)
	}

	return currentAccessor.GetName(), current
}

func TestNoOpUpdates(t *testing.T) {
	destroyFunc, registry := NewTestGenericStoreRegistry(t)
	defer destroyFunc()

	newPod := func() *api.Pod {
		return &api.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Namespace: api.NamespaceDefault,
				Name:      "foo",
				Labels:    map[string]string{"prepare_create": "true"},
			},
			Spec: api.PodSpec{NodeName: "machine"},
		}
	}

	var err error
	var createResult runtime.Object
	if createResult, err = registry.Create(genericapirequest.NewDefaultContext(), newPod()); err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	createdPod, err := registry.Get(genericapirequest.NewDefaultContext(), "foo", &metav1.GetOptions{})
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	var updateResult runtime.Object
	p := newPod()
	if updateResult, _, err = registry.Update(genericapirequest.NewDefaultContext(), p.Name, rest.DefaultUpdatedObjectInfo(p, api.Scheme)); err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	// Check whether we do not return empty result on no-op update.
	if !reflect.DeepEqual(createResult, updateResult) {
		t.Errorf("no-op update should return a correct value, got: %#v", updateResult)
	}

	updatedPod, err := registry.Get(genericapirequest.NewDefaultContext(), "foo", &metav1.GetOptions{})
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	createdMeta, err := meta.Accessor(createdPod)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	updatedMeta, err := meta.Accessor(updatedPod)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}

	if createdMeta.GetResourceVersion() != updatedMeta.GetResourceVersion() {
		t.Errorf("no-op update should be ignored and not written to etcd")
	}
}

// storeObjectUpdate updates given cache with a new object version from Informer
// callback (i.e. with events from etcd) or with an object modified by the
// controller itself. Returns "true", if the cache was updated, false if the
// object is an old version and should be ignored.
func storeObjectUpdate(store cache.Store, obj interface{}, className string) (bool, error) {
	objName, err := controller.KeyFunc(obj)
	if err != nil {
		return false, fmt.Errorf("Couldn't get key for object %+v: %v", obj, err)
	}
	oldObj, found, err := store.Get(obj)
	if err != nil {
		return false, fmt.Errorf("Error finding %s %q in controller cache: %v", className, objName, err)
	}

	objAccessor, err := meta.Accessor(obj)
	if err != nil {
		return false, err
	}

	if !found {
		// This is a new object
		glog.V(4).Infof("storeObjectUpdate: adding %s %q, version %s", className, objName, objAccessor.GetResourceVersion())
		if err = store.Add(obj); err != nil {
			return false, fmt.Errorf("Error adding %s %q to controller cache: %v", className, objName, err)
		}
		return true, nil
	}

	oldObjAccessor, err := meta.Accessor(oldObj)
	if err != nil {
		return false, err
	}

	objResourceVersion, err := strconv.ParseInt(objAccessor.GetResourceVersion(), 10, 64)
	if err != nil {
		return false, fmt.Errorf("Error parsing ResourceVersion %q of %s %q: %s", objAccessor.GetResourceVersion(), className, objName, err)
	}
	oldObjResourceVersion, err := strconv.ParseInt(oldObjAccessor.GetResourceVersion(), 10, 64)
	if err != nil {
		return false, fmt.Errorf("Error parsing old ResourceVersion %q of %s %q: %s", oldObjAccessor.GetResourceVersion(), className, objName, err)
	}

	// Throw away only older version, let the same version pass - we do want to
	// get periodic sync events.
	if oldObjResourceVersion > objResourceVersion {
		glog.V(4).Infof("storeObjectUpdate: ignoring %s %q version %s", className, objName, objAccessor.GetResourceVersion())
		return false, nil
	}

	glog.V(4).Infof("storeObjectUpdate updating %s %q with version %s", className, objName, objAccessor.GetResourceVersion())
	if err = store.Update(obj); err != nil {
		return false, fmt.Errorf("Error updating %s %q in controller cache: %v", className, objName, err)
	}
	return true, nil
}

// updateAnnotations updates annotations of obj
func (o AnnotateOptions) updateAnnotations(obj runtime.Object) error {
	accessor, err := meta.Accessor(obj)
	if err != nil {
		return err
	}
	if !o.overwrite {
		if err := validateNoAnnotationOverwrites(accessor, o.newAnnotations); err != nil {
			return err
		}
	}

	annotations := accessor.GetAnnotations()
	if annotations == nil {
		annotations = make(map[string]string)
	}

	for key, value := range o.newAnnotations {
		annotations[key] = value
	}
	for _, annotation := range o.removeAnnotations {
		delete(annotations, annotation)
	}
	accessor.SetAnnotations(annotations)

	if len(o.resourceVersion) != 0 {
		accessor.SetResourceVersion(o.resourceVersion)
	}
	return nil
}

func labelFunc(obj runtime.Object, overwrite bool, resourceVersion string, labels map[string]string, remove []string) error {
	accessor, err := meta.Accessor(obj)
	if err != nil {
		return err
	}
	if !overwrite {
		if err := validateNoOverwrites(accessor, labels); err != nil {
			return err
		}
	}

	objLabels := accessor.GetLabels()
	if objLabels == nil {
		objLabels = make(map[string]string)
	}

	for key, value := range labels {
		objLabels[key] = value
	}
	for _, label := range remove {
		delete(objLabels, label)
	}
	accessor.SetLabels(objLabels)

	if len(resourceVersion) != 0 {
		accessor.SetResourceVersion(resourceVersion)
	}
	return nil
}

// BenchmarkAccessorSetFastPath shows the interface fast path
func BenchmarkAccessorSetFastPath(b *testing.B) {
	obj := &api.Pod{
		TypeMeta: metav1.TypeMeta{APIVersion: "/a", Kind: "b"},
		ObjectMeta: metav1.ObjectMeta{
			Namespace:       "bar",
			Name:            "foo",
			GenerateName:    "prefix",
			UID:             "uid",
			ResourceVersion: "1",
			SelfLink:        "some/place/only/we/know",
			Labels:          map[string]string{"foo": "bar"},
			Annotations:     map[string]string{"x": "y"},
		},
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		acc, err := meta.Accessor(obj)
		if err != nil {
			b.Fatal(err)
		}
		acc.SetNamespace("something")
	}
	b.StopTimer()
}

// updateTaints updates taints of obj
func (o TaintOptions) updateTaints(obj runtime.Object) error {
	accessor, err := meta.Accessor(obj)
	if err != nil {
		return err
	}
	if !o.overwrite {
		if err := validateNoTaintOverwrites(accessor, o.taintsToAdd); err != nil {
			return err
		}
	}

	annotations := accessor.GetAnnotations()
	if annotations == nil {
		annotations = make(map[string]string)
	}

	newTaints, err := reorganizeTaints(accessor, o.overwrite, o.taintsToAdd, o.taintsToRemove)
	if err != nil {
		return err
	}
	taintsData, err := json.Marshal(newTaints)
	if err != nil {
		return err
	}
	annotations[v1.TaintsAnnotationKey] = string(taintsData)
	accessor.SetAnnotations(annotations)

	return nil
}

func TestParseFederationReplicaSetReference(t *testing.T) {
	successPrefs := []string{
		`{"rebalance": true,
		  "clusters": {
		    "k8s-1": {"minReplicas": 10, "maxReplicas": 20, "weight": 2},
		    "*": {"weight": 1}
		}}`,
	}
	failedPrefes := []string{
		`{`, // bad json
	}

	rs := newReplicaSetWithReplicas("rs-1", 100)
	accessor, _ := meta.Accessor(rs)
	anno := accessor.GetAnnotations()
	if anno == nil {
		anno = make(map[string]string)
		accessor.SetAnnotations(anno)
	}
	for _, prefString := range successPrefs {
		anno[FedReplicaSetPreferencesAnnotation] = prefString
		pref, err := parseFederationReplicaSetReference(rs)
		assert.NotNil(t, pref)
		assert.Nil(t, err)
	}
	for _, prefString := range failedPrefes {
		anno[FedReplicaSetPreferencesAnnotation] = prefString
		pref, err := parseFederationReplicaSetReference(rs)
		assert.Nil(t, pref)
		assert.NotNil(t, err)
	}
}

// getChangeCause returns the change-cause annotation of the input object
func getChangeCause(obj runtime.Object) string {
	accessor, err := meta.Accessor(obj)
	if err != nil {
		return ""
	}
	return accessor.GetAnnotations()[ChangeCauseAnnotation]
}

func GetPodFromTemplate(template *v1.PodTemplateSpec, parentObject runtime.Object, controllerRef *metav1.OwnerReference) (*v1.Pod, error) {
	desiredLabels := getPodsLabelSet(template)
	desiredFinalizers := getPodsFinalizers(template)
	desiredAnnotations, err := getPodsAnnotationSet(template, parentObject)
	if err != nil {
		return nil, err
	}
	accessor, err := meta.Accessor(parentObject)
	if err != nil {
		return nil, fmt.Errorf("parentObject does not have ObjectMeta, %v", err)
	}
	prefix := getPodsPrefix(accessor.GetName())

	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Labels:       desiredLabels,
			Annotations:  desiredAnnotations,
			GenerateName: prefix,
			Finalizers:   desiredFinalizers,
		},
	}
	if controllerRef != nil {
		pod.OwnerReferences = append(pod.OwnerReferences, *controllerRef)
	}
	clone, err := api.Scheme.DeepCopy(&template.Spec)
	if err != nil {
		return nil, err
	}
	pod.Spec = *clone.(*v1.PodSpec)
	return pod, nil
}

// MetaNamespaceIndexFunc is a default index function that indexes based on an object's namespace
func MetaNamespaceIndexFunc(obj interface{}) ([]string, error) {
	meta, err := meta.Accessor(obj)
	if err != nil {
		return []string{""}, fmt.Errorf("object has no meta: %v", err)
	}
	return []string{meta.GetNamespace()}, nil
}

func (t *tracker) Delete(gvk schema.GroupVersionKind, ns, name string) error {
	if err := checkNamespace(gvk, ns); err != nil {
		return err
	}

	t.lock.Lock()
	defer t.lock.Unlock()

	found := false

	for i, existingObj := range t.objects[gvk] {
		objMeta, err := meta.Accessor(existingObj)
		if err != nil {
			return err
		}
		if objMeta.GetNamespace() == ns && objMeta.GetName() == name {
			t.objects[gvk] = append(t.objects[gvk][:i], t.objects[gvk][i+1:]...)
			found = true
			break
		}
	}

	if found {
		return nil
	}

	return errors.NewNotFound(schema.GroupResource{Group: gvk.Group, Resource: gvk.Kind}, name)
}

func shouldOrphanDependents(e *event, accessor metav1.Object) bool {
	// The delta_fifo may combine the creation and update of the object into one
	// event, so we need to check AddEvent as well.
	if e.oldObj == nil {
		if accessor.GetDeletionTimestamp() == nil {
			return false
		}
	} else {
		oldAccessor, err := meta.Accessor(e.oldObj)
		if err != nil {
			utilruntime.HandleError(fmt.Errorf("cannot access oldObj: %v", err))
			return false
		}
		// ignore the event if it's not updating DeletionTimestamp from non-nil to nil.
		if accessor.GetDeletionTimestamp() == nil || oldAccessor.GetDeletionTimestamp() != nil {
			return false
		}
	}
	finalizers := accessor.GetFinalizers()
	for _, finalizer := range finalizers {
		if finalizer == v1.FinalizerOrphan {
			return true
		}
	}
	return false
}