multiNamespaceCache: support custom newCache funcs per namespace

Signed-off-by: Joe Lanford <joe.lanford@gmail.com>

Author: joelanford

pkg/cache/cache_test.go

@@ -121,6 +121,186 @@ var _ = Describe("Multi-Namespace Informer Cache", func() {
 var _ = Describe("Informer Cache without DeepCopy", func() {
 	CacheTest(cache.New, cache.Options{UnsafeDisableDeepCopyByObject: cache.DisableDeepCopyByObject{cache.ObjectAll{}: true}})
 })
+var _ = Describe("ByNamespace Cache", func() {
+	defer GinkgoRecover()
+	var (
+		informerCache       cache.Cache
+		informerCacheCtx    context.Context
+		informerCacheCancel context.CancelFunc
+		pod1a               client.Object
+		pod1b               client.Object
+		pod2a               client.Object
+		pod2b               client.Object
+		pod2c               client.Object
+		pod3a               client.Object
+		pod3b               client.Object
+	)
+	BeforeEach(func() {
+		informerCacheCtx, informerCacheCancel = context.WithCancel(context.Background())
+		Expect(cfg).NotTo(BeNil())
+		cl, err := client.New(cfg, client.Options{})
+		Expect(err).NotTo(HaveOccurred())
+		err = ensureNamespace(testNamespaceOne, cl)
+		Expect(err).NotTo(HaveOccurred())
+		err = ensureNamespace(testNamespaceTwo, cl)
+		Expect(err).NotTo(HaveOccurred())
+		err = ensureNamespace(testNamespaceThree, cl)
+		Expect(err).NotTo(HaveOccurred())
+		err = ensureNode(testNodeOne, cl)
+		Expect(err).NotTo(HaveOccurred())
+		// namespace 1 stuff
+		pod1a = createPod("pod-1a", testNamespaceOne, corev1.RestartPolicyNever)                                                     // matches (everything matches)
+		pod1b = createPodWithLabels("pod-1b", testNamespaceOne, corev1.RestartPolicyNever, map[string]string{"other-match": "true"}) // matches (everything matches)
+		// namespace 2 stuff
+		pod2a = createPodWithLabels("pod-2a", testNamespaceTwo, corev1.RestartPolicyNever, map[string]string{"ns2-match": "false"})  // no match (does not match ns2 label selector)
+		pod2b = createPodWithLabels("pod-2b", testNamespaceTwo, corev1.RestartPolicyNever, map[string]string{"ns2-match": "true"})   // matches (matches ns2 label selector)
+		pod2c = createPodWithLabels("pod-2c", testNamespaceTwo, corev1.RestartPolicyNever, map[string]string{"other-match": "true"}) // no match (does not match ns2 label selector)
+		// namespace 3 stuff
+		pod3a = createPodWithLabels("pod-3a", testNamespaceThree, corev1.RestartPolicyNever, map[string]string{"other-match": "false"}) // no match (does not match default cache label selector)
+		pod3b = createPodWithLabels("pod-3b", testNamespaceThree, corev1.RestartPolicyNever, map[string]string{"other-match": "true"})  // matches (matches default cache label selector)
+		By("creating the informer cache")
+		informerCache, err = cache.MultiNamespacedCacheWithOptionsBuilder(
+			cache.WithNamespaceCache(testNamespaceOne, cache.New),
+			cache.WithNamespaceCache(testNamespaceTwo, cache.BuilderWithOptions(cache.Options{
+				DefaultSelector: cache.ObjectSelector{
+					Label: labels.Set{"ns2-match": "true"}.AsSelector(),
+				},
+			})),
+			cache.WithDefaultNamespacedCache(cache.BuilderWithOptions(cache.Options{
+				DefaultSelector: cache.ObjectSelector{
+					Label: labels.Set{"other-match": "true"}.AsSelector(),
+				},
+			})),
+			cache.WithClusterScopedCache(cache.BuilderWithOptions(cache.Options{
+				DefaultSelector: cache.ObjectSelector{
+					Field: fields.OneTermEqualSelector("metadata.name", testNodeOne),
+				},
+			})),
+		)(cfg, cache.Options{})
+		Expect(err).NotTo(HaveOccurred())
+		By("running the cache and waiting for it to sync")
+		// pass as an arg so that we don't race between close and re-assign
+		go func(ctx context.Context) {
+			defer GinkgoRecover()
+			Expect(informerCache.Start(ctx)).To(Succeed())
+		}(informerCacheCtx)
+		Expect(informerCache.WaitForCacheSync(informerCacheCtx)).To(BeTrue())
+	})
+	Describe("Get", func() {
+		It("should get an item from a namespace cache", func() {
+			pod := &corev1.Pod{}
+			err := informerCache.Get(informerCacheCtx, client.ObjectKeyFromObject(pod1a), pod)
+			Expect(err).NotTo(HaveOccurred())
+		})
+		It("should get an item from the default namespace cache", func() {
+			pod := &corev1.Pod{}
+			err := informerCache.Get(informerCacheCtx, client.ObjectKeyFromObject(pod3b), pod)
+			Expect(err).NotTo(HaveOccurred())
+		})
+		It("should get a cluster-scoped item", func() {
+			node := &corev1.Node{}
+			err := informerCache.Get(informerCacheCtx, client.ObjectKey{Name: testNodeOne}, node)
+			Expect(err).NotTo(HaveOccurred())
+		})
+		It("should not find an item from a namespace-specific cache if it is not matched", func() {
+			pod := &corev1.Pod{}
+			err := informerCache.Get(informerCacheCtx, client.ObjectKeyFromObject(pod2a), pod)
+			Expect(apierrors.IsNotFound(err)).To(BeTrue())
+		})
+		It("should not find an item from the default namespace cache if it is not matched", func() {
+			pod := &corev1.Pod{}
+			err := informerCache.Get(informerCacheCtx, client.ObjectKeyFromObject(pod3a), pod)
+			Expect(apierrors.IsNotFound(err)).To(BeTrue())
+		})
+		It("should not find an item at the cluster-scope if it is not matched", func() {
+			ns := &corev1.Namespace{}
+			err := informerCache.Get(informerCacheCtx, client.ObjectKey{Name: testNamespaceOne}, ns)
+			Expect(apierrors.IsNotFound(err)).To(BeTrue())
+		})
+	})
+	Describe("List", func() {
+		When("Request is cluster-scoped", func() {
+			It("Should list all pods and find exactly four", func() {
+				var pods corev1.PodList
+				err := informerCache.List(informerCacheCtx, &pods)
+				Expect(err).NotTo(HaveOccurred())
+				sort.Slice(pods.Items, func(i, j int) bool {
+					if pods.Items[i].Namespace != pods.Items[j].Namespace {
+						return pods.Items[i].Namespace < pods.Items[j].Namespace
+					}
+					return pods.Items[i].Name < pods.Items[j].Name
+				})
+				Expect(pods.Items).To(HaveLen(4))
+				Expect(pods.Items[0].Namespace).To(Equal(testNamespaceOne))
+				Expect(pods.Items[0].Name).To(Equal("pod-1a"))
+				Expect(pods.Items[1].Namespace).To(Equal(testNamespaceOne))
+				Expect(pods.Items[1].Name).To(Equal("pod-1b"))
+				Expect(pods.Items[2].Namespace).To(Equal(testNamespaceTwo))
+				Expect(pods.Items[2].Name).To(Equal("pod-2b"))
+				Expect(pods.Items[3].Namespace).To(Equal(testNamespaceThree))
+				Expect(pods.Items[3].Name).To(Equal("pod-3b"))
+			})
+			It("Should list nodes and find exactly one", func() {
+				var nodes corev1.NodeList
+				err := informerCache.List(informerCacheCtx, &nodes)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(nodes.Items).To(HaveLen(1))
+				Expect(nodes.Items[0].Namespace).To(Equal(""))
+				Expect(nodes.Items[0].Name).To(Equal(testNodeOne))
+			})
+			It("Should list namespaces and find none", func() {
+				var namespaces corev1.NamespaceList
+				err := informerCache.List(informerCacheCtx, &namespaces)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(namespaces.Items).To(HaveLen(0))
+			})
+		})
+		When("Request is namespace-scoped", func() {
+			It("Should list pods in namespace one", func() {
+				var pods corev1.PodList
+				err := informerCache.List(informerCacheCtx, &pods, client.InNamespace(testNamespaceOne))
+				Expect(err).NotTo(HaveOccurred())
+				sort.Slice(pods.Items, func(i, j int) bool {
+					if pods.Items[i].Namespace != pods.Items[j].Namespace {
+						return pods.Items[i].Namespace < pods.Items[j].Namespace
+					}
+					return pods.Items[i].Name < pods.Items[j].Name
+				})
+				Expect(pods.Items).To(HaveLen(2))
+				Expect(pods.Items[0].Namespace).To(Equal(testNamespaceOne))
+				Expect(pods.Items[0].Name).To(Equal("pod-1a"))
+				Expect(pods.Items[1].Namespace).To(Equal(testNamespaceOne))
+				Expect(pods.Items[1].Name).To(Equal("pod-1b"))
+			})
+			It("Should list pods in namespace two", func() {
+				var pods corev1.PodList
+				err := informerCache.List(informerCacheCtx, &pods, client.InNamespace(testNamespaceTwo))
+				Expect(err).NotTo(HaveOccurred())
+				Expect(pods.Items).To(HaveLen(1))
+				Expect(pods.Items[0].Namespace).To(Equal(testNamespaceTwo))
+				Expect(pods.Items[0].Name).To(Equal("pod-2b"))
+			})
+			It("Should list pods in namespace three", func() {
+				var pods corev1.PodList
+				err := informerCache.List(informerCacheCtx, &pods, client.InNamespace(testNamespaceThree))
+				Expect(err).NotTo(HaveOccurred())
+				Expect(pods.Items).To(HaveLen(1))
+				Expect(pods.Items[0].Namespace).To(Equal(testNamespaceThree))
+				Expect(pods.Items[0].Name).To(Equal("pod-3b"))
+			})
+		})
+	})
+	AfterEach(func() {
+		deletePod(pod1a)
+		deletePod(pod1b)
+		deletePod(pod2a)
+		deletePod(pod2b)
+		deletePod(pod2c)
+		deletePod(pod3a)
+		deletePod(pod3b)
+		informerCacheCancel()
+	})
+})
 
 var _ = Describe("Cache with transformers", func() {
 	var (