add ResourceVersion to DeleteOptions.Preconditions

Kubernetes-commit: 8f48d762717dfe1f479cfabaabc4fb9261a1bc8f

pkg/registry/generic/registry/store.go

@@ -448,6 +448,7 @@ func (e *Store) Update(ctx context.Context, name string, objInfo rest.UpdatedObj
 	storagePreconditions := &storage.Preconditions{}
 	if preconditions := objInfo.Preconditions(); preconditions != nil {
 		storagePreconditions.UID = preconditions.UID
+		storagePreconditions.ResourceVersion = preconditions.ResourceVersion
 	}
 
 	out := e.NewFunc()
@@ -879,6 +880,7 @@ func (e *Store) Delete(ctx context.Context, name string, options *metav1.DeleteO
 	var preconditions storage.Preconditions
 	if options.Preconditions != nil {
 		preconditions.UID = options.Preconditions.UID
+		preconditions.ResourceVersion = options.Preconditions.ResourceVersion
 	}
 	graceful, pendingGraceful, err := rest.BeforeDelete(e.DeleteStrategy, ctx, obj, options)
 	if err != nil {

pkg/registry/rest/delete.go

@@ -77,9 +77,14 @@ func BeforeDelete(strategy RESTDeleteStrategy, ctx context.Context, obj runtime.
 		return false, false, errors.NewInvalid(schema.GroupKind{Group: metav1.GroupName, Kind: "DeleteOptions"}, "", errs)
 	}
 	// Checking the Preconditions here to fail early. They'll be enforced later on when we actually do the deletion, too.
-	if options.Preconditions != nil && options.Preconditions.UID != nil && *options.Preconditions.UID != objectMeta.GetUID() {
+	if options.Preconditions != nil {
+		if options.Preconditions.UID != nil && *options.Preconditions.UID != objectMeta.GetUID() {
 			return false, false, errors.NewConflict(schema.GroupResource{Group: gvk.Group, Resource: gvk.Kind}, objectMeta.GetName(), fmt.Errorf("the UID in the precondition (%s) does not match the UID in record (%s). The object might have been deleted and then recreated", *options.Preconditions.UID, objectMeta.GetUID()))
 		}
+		if options.Preconditions.ResourceVersion != nil && *options.Preconditions.ResourceVersion != objectMeta.GetResourceVersion() {
+			return false, false, errors.NewConflict(schema.GroupResource{Group: gvk.Group, Resource: gvk.Kind}, objectMeta.GetName(), fmt.Errorf("the ResourceVersion in the precondition (%s) does not match the ResourceVersion in record (%s). The object might have been deleted and then recreated", *options.Preconditions.ResourceVersion, objectMeta.GetResourceVersion()))
+		}
+	}
 	gracefulStrategy, ok := strategy.(RESTGracefulDeleteStrategy)
 	if !ok {
 		// If we're not deleting gracefully there's no point in updating Generation, as we won't update

pkg/registry/rest/resttest/resttest.go

@@ -909,6 +909,43 @@ func (t *Tester) testDeleteWithUID(obj runtime.Object, createFn CreateFunc, getF
 	}
 }
 
+//  This test the fast-fail path. We test that the precondition gets verified
+//  again before deleting the object in tests of pkg/storage/etcd.
+func (t *Tester) testDeleteWithResourceVersion(obj runtime.Object, createFn CreateFunc, getFn GetFunc, isNotFoundFn IsErrorFunc, opts metav1.DeleteOptions) {
+	ctx := t.TestContext()
+
+	foo := obj.DeepCopyObject()
+	t.setObjectMeta(foo, t.namer(1))
+	objectMeta := t.getObjectMetaOrFail(foo)
+	objectMeta.SetResourceVersion("RV0000")
+	if err := createFn(ctx, foo); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	opts.Preconditions = metav1.NewPreconditionDeleteOptionsWithResourceVersion("RV1111").Preconditions
+	obj, _, err := t.storage.(rest.GracefulDeleter).Delete(ctx, objectMeta.GetName(), &opts)
+	if err == nil || !errors.IsConflict(err) {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	obj, _, err = t.storage.(rest.GracefulDeleter).Delete(ctx, objectMeta.GetName(), metav1.NewPreconditionDeleteOptionsWithResourceVersion("RV0000"))
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if !t.returnDeletedObject {
+		if status, ok := obj.(*metav1.Status); !ok {
+			t.Errorf("expected status of delete, got %v", status)
+		} else if status.Status != metav1.StatusSuccess {
+			t.Errorf("expected success, got: %v", status.Status)
+		}
+	}
+
+	_, err = getFn(ctx, foo)
+	if err == nil || !isNotFoundFn(err) {
+		t.Errorf("unexpected error: %v", err)
+	}
+}
+
 // =============================================================================
 // Graceful Deletion tests.
 

pkg/storage/interfaces.go

@@ -98,6 +98,9 @@ type Preconditions struct {
 	// Specifies the target UID.
 	// +optional
 	UID *types.UID `json:"uid,omitempty"`
+	// Specifies the target ResourceVersion
+	// +optional
+	ResourceVersion *string `json:"resourceVersion,omitempty"`
 }
 
 // NewUIDPreconditions returns a Preconditions with UID set.