✨ Implement delete collection via delete options

implement `CollectionOptions` in `DeleteOptions` that allow to issue a
`DeleteCollection` call under the hood

add tests + examples

Co-Authored-By: Aaron Clawson <Aaron.Clawson@gmail.com>

pkg/client/client_test.go

@@ -70,7 +70,7 @@ var _ = Describe("Client", func() {
 	BeforeEach(func(done Done) {
 		atomic.AddUint64(&count, 1)
 		dep = &appsv1.Deployment{
-			ObjectMeta: metav1.ObjectMeta{Name: fmt.Sprintf("deployment-name-%v", count), Namespace: ns},
+			ObjectMeta: metav1.ObjectMeta{Name: fmt.Sprintf("deployment-name-%v", count), Namespace: ns, Labels: map[string]string{"app": fmt.Sprintf("bar-%v", count)}},
 			Spec: appsv1.DeploymentSpec{
 				Replicas: &replicaCount,
 				Selector: &metav1.LabelSelector{
@@ -898,6 +898,42 @@ var _ = Describe("Client", func() {
 			PIt("should fail if the GVK cannot be mapped to a Resource", func() {
 
 			})
+
+			It("should delete a collection of object", func(done Done) {
+				cl, err := client.New(cfg, client.Options{})
+				Expect(err).NotTo(HaveOccurred())
+				Expect(cl).NotTo(BeNil())
+
+				By("initially creating two Deployments")
+
+				dep2 := dep.DeepCopy()
+				dep2.Name = dep2.Name + "-2"
+
+				dep, err = clientset.AppsV1().Deployments(ns).Create(dep)
+				Expect(err).NotTo(HaveOccurred())
+				dep2, err = clientset.AppsV1().Deployments(ns).Create(dep2)
+				Expect(err).NotTo(HaveOccurred())
+
+				depName := dep.Name
+				dep2Name := dep2.Name
+
+				labelmatcher := client.CollectionOptions(
+					client.MatchingLabels(dep.ObjectMeta.Labels),
+					client.InNamespace(ns),
+				)
+
+				By("deleting Deployments")
+				err = cl.Delete(context.TODO(), dep, labelmatcher)
+				Expect(err).NotTo(HaveOccurred())
+
+				By("validating the Deployment no longer exists")
+				_, err = clientset.AppsV1().Deployments(ns).Get(depName, metav1.GetOptions{})
+				Expect(err).To(HaveOccurred())
+				_, err = clientset.AppsV1().Deployments(ns).Get(dep2Name, metav1.GetOptions{})
+				Expect(err).To(HaveOccurred())
+
+				close(done)
+			})
 		})
 		Context("with unstructured objects", func() {
 			It("should delete an existing object from a go struct", func(done Done) {
@@ -974,6 +1010,49 @@ var _ = Describe("Client", func() {
 
 				close(done)
 			})
+
+			It("should delete a collection of object", func(done Done) {
+				cl, err := client.New(cfg, client.Options{})
+				Expect(err).NotTo(HaveOccurred())
+				Expect(cl).NotTo(BeNil())
+
+				By("initially creating two Deployments")
+
+				dep2 := dep.DeepCopy()
+				dep2.Name = dep2.Name + "-2"
+
+				dep, err = clientset.AppsV1().Deployments(ns).Create(dep)
+				Expect(err).NotTo(HaveOccurred())
+				dep2, err = clientset.AppsV1().Deployments(ns).Create(dep2)
+				Expect(err).NotTo(HaveOccurred())
+
+				depName := dep.Name
+				dep2Name := dep2.Name
+
+				labelmatcher := client.CollectionOptions(
+					client.MatchingLabels(dep.ObjectMeta.Labels),
+					client.InNamespace(ns),
+				)
+
+				By("deleting Deployments")
+				u := &unstructured.Unstructured{}
+				Expect(scheme.Convert(dep, u, nil)).To(Succeed())
+				u.SetGroupVersionKind(schema.GroupVersionKind{
+					Group:   "apps",
+					Kind:    "Deployment",
+					Version: "v1",
+				})
+				err = cl.Delete(context.TODO(), u, labelmatcher)
+				Expect(err).NotTo(HaveOccurred())
+
+				By("validating the Deployment no longer exists")
+				_, err = clientset.AppsV1().Deployments(ns).Get(depName, metav1.GetOptions{})
+				Expect(err).To(HaveOccurred())
+				_, err = clientset.AppsV1().Deployments(ns).Get(dep2Name, metav1.GetOptions{})
+				Expect(err).To(HaveOccurred())
+
+				close(done)
+			})
 		})
 	})
 
@@ -1994,6 +2073,10 @@ var _ = Describe("Client", func() {
 			PIt("should fail if the object doesn't have meta", func() {
 
 			})
+
+			PIt("should filter results by namespace selector", func() {
+
+			})
 		})
 	})
 
@@ -2043,6 +2126,12 @@ var _ = Describe("Client", func() {
 			Expect(do.AsDeleteOptions()).To(Equal(&metav1.DeleteOptions{}))
 		})
 
+		It("should producte nil CollectionOptions if not present", func() {
+			do := &client.DeleteOptions{}
+			do.AsDeleteOptions()
+			Expect(do.CollectionOptions).To(BeNil())
+		})
+
 		It("should merge multiple options together", func() {
 			gp := int64(1)
 			pc := metav1.NewUIDPreconditions("uid")
@@ -2052,10 +2141,13 @@ var _ = Describe("Client", func() {
 				client.GracePeriodSeconds(gp),
 				client.Preconditions(pc),
 				client.PropagationPolicy(dp),
+				client.CollectionOptions(client.UseListOptions(&client.ListOptions{Namespace: "test"})),
 			})
 			Expect(do.GracePeriodSeconds).To(Equal(&gp))
 			Expect(do.Preconditions).To(Equal(pc))
 			Expect(do.PropagationPolicy).To(Equal(&dp))
+			Expect(do.CollectionOptions).NotTo(BeNil())
+			Expect(do.CollectionOptions.Namespace).To(Equal("test"))
 		})
 	})
 
@@ -2136,6 +2228,13 @@ var _ = Describe("Client", func() {
 			Expect(lo).NotTo(BeNil())
 			Expect(lo.Namespace).To(Equal("test"))
 		})
+
+		It("should produce empty metav1.ListOptions if nil", func() {
+			var do *client.ListOptions
+			Expect(do.AsListOptions()).To(Equal(&metav1.ListOptions{}))
+			do = &client.ListOptions{}
+			Expect(do.AsListOptions()).To(Equal(&metav1.ListOptions{}))
+		})
 	})
 
 	Describe("UpdateOptions", func() {

pkg/client/example_test.go

@@ -199,6 +199,27 @@ func ExampleClient_delete() {
 	_ = c.Delete(context.Background(), u)
 }
 
+// This example shows how to use the client with typed and unstrucurted objects to delete collections of objects.
+func ExampleClient_deleteCollection() {
+	labelMatcher := client.CollectionOptions(
+		client.MatchingLabels(map[string]string{"app": "foo"}),
+		client.InNamespace("foo"),
+	)
+	// Using a typed object.
+	pod := &corev1.Pod{}
+	// c is a created client.
+	_ = c.Delete(context.Background(), pod, labelMatcher)
+
+	// Using an unstructured Object
+	u := &unstructured.UnstructuredList{}
+	u.SetGroupVersionKind(schema.GroupVersionKind{
+		Group:   "apps",
+		Kind:    "Deployment",
+		Version: "v1",
+	})
+	_ = c.Delete(context.Background(), u, labelMatcher)
+}
+
 // This example shows how to set up and consume a field selector over a pod's volumes' secretName field.
 func ExampleFieldIndexer_secretName() {
 	// someIndexer is a FieldIndexer over a Cache

pkg/client/fake/client.go

@@ -161,10 +161,49 @@ func (c *fakeClient) Delete(ctx context.Context, obj runtime.Object, opts ...cli
 	if err != nil {
 		return err
 	}
+	delOptions := client.DeleteOptions{}
+	delOptions.ApplyOptions(opts)
+	if delOptions.CollectionOptions != nil {
+		return c.deleteCollection(obj, delOptions)
+	}
+
 	//TODO: implement propagation
 	return c.tracker.Delete(gvr, accessor.GetNamespace(), accessor.GetName())
 }
 
+func (c *fakeClient) deleteCollection(obj runtime.Object, dcOptions client.DeleteOptions) error {
+	gvk, err := apiutil.GVKForObject(obj, scheme.Scheme)
+	if err != nil {
+		return err
+	}
+
+	gvr, _ := meta.UnsafeGuessKindToResource(gvk)
+	o, err := c.tracker.List(gvr, gvk, dcOptions.CollectionOptions.Namespace)
+	if err != nil {
+		return err
+	}
+
+	objs, err := meta.ExtractList(o)
+	if err != nil {
+		return err
+	}
+	filteredObjs, err := objectutil.FilterWithLabels(objs, dcOptions.CollectionOptions.LabelSelector)
+	if err != nil {
+		return err
+	}
+	for _, o := range filteredObjs {
+		accessor, err := meta.Accessor(o)
+		if err != nil {
+			return err
+		}
+		err = c.tracker.Delete(gvr, accessor.GetNamespace(), accessor.GetName())
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (c *fakeClient) Update(ctx context.Context, obj runtime.Object, opts ...client.UpdateOptionFunc) error {
 	updateOptions := &client.UpdateOptions{}
 	updateOptions.ApplyOptions(opts)

pkg/client/fake/client_test.go

@@ -158,6 +158,21 @@ var _ = Describe("Fake client", func() {
 			Expect(list.Items).To(ConsistOf(*dep2))
 		})
 
+		It("should be able to Delete a Collection", func() {
+			By("Deleting a deploymentList")
+			labelFilter := client.CollectionOptions(
+				client.InNamespace("ns1"),
+			)
+			err := cl.Delete(nil, &appsv1.Deployment{}, labelFilter)
+			Expect(err).To(BeNil())
+
+			By("Listing all deployments in the namespace")
+			list := &appsv1.DeploymentList{}
+			err = cl.List(nil, list, client.InNamespace("ns1"))
+			Expect(err).To(BeNil())
+			Expect(list.Items).To(BeEmpty())
+		})
+
 		Context("with the DryRun option", func() {
 			It("should not create a new object", func() {
 				By("Creating a new configmap with DryRun")

pkg/client/options.go

@@ -94,6 +94,10 @@ type DeleteOptions struct {
 	// foreground.
 	PropagationPolicy *metav1.DeletionPropagation
 
+	// CollectionOptions is used by the DeleteCollection to determine the objects
+	// To be deleted.
+	CollectionOptions *ListOptions
+
 	// Raw represents raw DeleteOptions, as passed to the API server.
 	Raw *metav1.DeleteOptions
 }
@@ -153,6 +157,17 @@ func PropagationPolicy(p metav1.DeletionPropagation) DeleteOptionFunc {
 	}
 }
 
+// CollectionOptions is a functional option that sets the CollectionOptions
+// field of a DeleteOptions struct
+func CollectionOptions(listOpts ...ListOptionFunc) DeleteOptionFunc {
+	return func(opts *DeleteOptions) {
+		if opts.CollectionOptions == nil {
+			opts.CollectionOptions = &ListOptions{}
+		}
+		opts.CollectionOptions.ApplyOptions(listOpts)
+	}
+}
+
 // ListOptions contains options for limiting or filtering results.
 // It's generally a subset of metav1.ListOptions, with support for
 // pre-parsed selectors (since generally, selectors will be executed

pkg/client/typed_client.go

@@ -76,11 +76,29 @@ func (c *typedClient) Delete(ctx context.Context, obj runtime.Object, opts ...De
 	}
 
 	deleteOpts := DeleteOptions{}
+	deleteOpts.ApplyOptions(opts)
+
+	if deleteOpts.CollectionOptions != nil {
+		return c.deleteCollection(ctx, o, deleteOpts)
+	}
+
 	return o.Delete().
 		NamespaceIfScoped(o.GetNamespace(), o.isNamespaced()).
 		Resource(o.resource()).
 		Name(o.GetName()).
-		Body(deleteOpts.ApplyOptions(opts).AsDeleteOptions()).
+		Body(deleteOpts.AsDeleteOptions()).
+		Context(ctx).
+		Do().
+		Error()
+}
+
+// DeleteCollection implements client.Client
+func (c *typedClient) deleteCollection(ctx context.Context, o *objMeta, deleteOpts DeleteOptions) error {
+	return o.Delete().
+		NamespaceIfScoped(deleteOpts.CollectionOptions.Namespace, o.isNamespaced()).
+		Resource(o.resource()).
+		VersionedParams(deleteOpts.CollectionOptions.AsListOptions(), c.paramCodec).
+		Body(deleteOpts.AsDeleteOptions()).
 		Context(ctx).
 		Do().
 		Error()

pkg/client/unstructured_client.go

@@ -87,7 +87,23 @@ func (uc *unstructuredClient) Delete(_ context.Context, obj runtime.Object, opts
 		return err
 	}
 	deleteOpts := DeleteOptions{}
-	err = r.Delete(u.GetName(), deleteOpts.ApplyOptions(opts).AsDeleteOptions())
+	deleteOpts.ApplyOptions(opts)
+	if deleteOpts.CollectionOptions != nil {
+		return uc.deleteCollection(u, deleteOpts)
+	}
+	err = r.Delete(u.GetName(), deleteOpts.AsDeleteOptions())
+	return err
+}
+
+func (uc *unstructuredClient) deleteCollection(u *unstructured.Unstructured, dcOpts DeleteOptions) error {
+	gvk := u.GroupVersionKind()
+
+	r, err := uc.getResourceInterface(gvk, dcOpts.CollectionOptions.Namespace)
+	if err != nil {
+		return err
+	}
+
+	err = r.DeleteCollection(dcOpts.AsDeleteOptions(), *dcOpts.CollectionOptions.AsListOptions())
 	return err
 }