Fix fabric8io#3228: Add support for Dynamic informers in KubernetesCl…

…ient Introduce a new method in SharedInformerFactory which will only accept CustomResourceDefinitionContext, types would automatically be assumed to be GenericKubernetesResource and GenericKubernetesResourceList. Till now we were deciding whether a resource is namespaced or not depending upon whether it implements Namespaced interface or not. But having dynamic informers required change to consider `scope` field in CustomResourceDefinitionContext as well, hence I introduced a new class SharedInformerOperationsImpl which overrides `isResourceNamespaced()` so that it can be configured from calling methods.
rohanKanojia · Jun 9, 2021 · 06e0980 · 06e0980
1 parent fb5e638
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -41,6 +41,7 @@
 * Add DSL support for `user.openshift.io/v1` Identity in OpenShiftClient DSL
 * Add DSL support for OpenShift Whereabouts CNI Model `whereabouts.cni.cncf.io` to OpenShiftClient DSL
 * Add DSL support for OpenShift Kube Storage Version Migrator resources in OpenShiftClient DSL
+* Fix #3228: Add support for Dynamic informers for custom resources in KubernetesClient
 
 #### _**Note**_: Breaking changes in the API
 ##### DSL Changes:

diff --git a/...netes-client/src/main/java/io/fabric8/kubernetes/client/SharedInformerOperationsImpl.java b/...netes-client/src/main/java/io/fabric8/kubernetes/client/SharedInformerOperationsImpl.java
@@ -0,0 +1,36 @@
+/**
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.fabric8.kubernetes.client;
+
+import io.fabric8.kubernetes.api.model.HasMetadata;
+import io.fabric8.kubernetes.api.model.KubernetesResourceList;
+import io.fabric8.kubernetes.client.dsl.Resource;
+import io.fabric8.kubernetes.client.dsl.base.HasMetadataOperation;
+import io.fabric8.kubernetes.client.dsl.base.OperationContext;
+
+public class SharedInformerOperationsImpl<T extends HasMetadata, L extends KubernetesResourceList<T>, R extends Resource<T>> extends HasMetadataOperation<T, L, R> {
+  private final boolean resourceNamespaced;
+
+  public SharedInformerOperationsImpl(OperationContext context, boolean resourceNamespaced) {
+    super(context);
+    this.resourceNamespaced = resourceNamespaced;
+  }
+
+  @Override
+  public boolean isResourceNamespaced() {
+    return resourceNamespaced;
+  }
+}
diff --git a/.../src/main/java/io/fabric8/kubernetes/client/dsl/base/CustomResourceDefinitionContext.java b/.../src/main/java/io/fabric8/kubernetes/client/dsl/base/CustomResourceDefinitionContext.java
@@ -62,6 +62,13 @@ public boolean isStatusSubresource() {
     return statusSubresource;
   }
 
+  public boolean isNamespaceScoped() {
+    if (scope != null) {
+      return scope.equals("Namespaced");
+    }
+    return false;
+  }
+
   @SuppressWarnings("rawtypes")
   public static CustomResourceDefinitionBuilder v1beta1CRDFromCustomResourceType(Class<? extends CustomResource> customResource) {
     try {

diff --git a/...es-client/src/main/java/io/fabric8/kubernetes/client/informers/SharedInformerFactory.java b/...es-client/src/main/java/io/fabric8/kubernetes/client/informers/SharedInformerFactory.java
@@ -17,20 +17,28 @@
 
 import static io.fabric8.kubernetes.client.utils.KubernetesResourceUtil.inferListType;
 
+import io.fabric8.kubernetes.api.model.GenericKubernetesResource;
+import io.fabric8.kubernetes.api.model.GenericKubernetesResourceList;
 import io.fabric8.kubernetes.api.model.HasMetadata;
 import io.fabric8.kubernetes.api.model.KubernetesResourceList;
 import io.fabric8.kubernetes.api.model.ListOptions;
 import io.fabric8.kubernetes.client.Config;
 import io.fabric8.kubernetes.client.ConfigBuilder;
 import io.fabric8.kubernetes.client.CustomResource;
+import io.fabric8.kubernetes.client.Handlers;
+import io.fabric8.kubernetes.client.ResourceHandler;
+import io.fabric8.kubernetes.client.SharedInformerOperationsImpl;
 import io.fabric8.kubernetes.client.Watch;
 import io.fabric8.kubernetes.client.Watcher;
+import io.fabric8.kubernetes.client.dsl.Resource;
 import io.fabric8.kubernetes.client.dsl.base.BaseOperation;
 import io.fabric8.kubernetes.client.dsl.base.CustomResourceDefinitionContext;
 import io.fabric8.kubernetes.client.dsl.base.OperationContext;
 import io.fabric8.kubernetes.client.informers.impl.DefaultSharedIndexInformer;
+import io.fabric8.kubernetes.client.utils.ApiVersionUtil;
 import io.fabric8.kubernetes.client.utils.Utils;
 import io.fabric8.kubernetes.internal.KubernetesDeserializer;
+
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -122,7 +130,7 @@ public SharedInformerFactory withName(String name) {
    * @return the shared index informer
    */
   public synchronized <T extends HasMetadata> SharedIndexInformer<T> sharedIndexInformerFor(Class<T> apiTypeClass, long resyncPeriodInMillis) {
-    return sharedIndexInformerFor(apiTypeClass, inferListType(apiTypeClass), null, resyncPeriodInMillis);
+    return sharedIndexInformerFor(apiTypeClass, inferListType(apiTypeClass), null, resyncPeriodInMillis, Utils.isResourceNamespaced(apiTypeClass));
   }
 
   /**
@@ -137,7 +145,7 @@ public synchronized <T extends HasMetadata> SharedIndexInformer<T> sharedIndexIn
    * @return the shared index informer
    */
   public synchronized <T extends HasMetadata> SharedIndexInformer<T> sharedIndexInformerFor(Class<T> apiTypeClass, OperationContext operationContext, long resyncPeriodInMillis) {
-    return sharedIndexInformerFor(apiTypeClass, inferListType(apiTypeClass), operationContext, resyncPeriodInMillis);
+    return sharedIndexInformerFor(apiTypeClass, inferListType(apiTypeClass), operationContext, resyncPeriodInMillis, Utils.isResourceNamespaced(apiTypeClass));
   }
 
   /**
@@ -165,7 +173,28 @@ public synchronized <T extends HasMetadata> SharedIndexInformer<T> sharedIndexIn
       .withApiGroupName(customResourceContext.getGroup())
       .withApiGroupVersion(customResourceContext.getVersion())
       .withPlural(customResourceContext.getPlural())
-      .withIsNamespaceConfiguredFromGlobalConfig(context.isNamespaceFromGlobalConfig()), resyncPeriodInMillis);
+      .withIsNamespaceConfiguredFromGlobalConfig(context.isNamespaceFromGlobalConfig()), resyncPeriodInMillis, Utils.isResourceNamespaced(apiTypeClass));
+  }
+
+  /**
+   * Constructs and returns a shared index informer with resync period specified for a Custom Resource. You
+   * can use it for scenarios where you don't have a POJO for your custom type by specifying group, version and plural in
+   * {@link CustomResourceDefinitionContext}
+   *
+   * <b>Note:</b>It watches for events in <b>ALL NAMESPACES</b>.
+   *
+   * @param genericResourceContext object containing details about resource like apiGroup, version and plural, etc.
+   * @param resyncPeriodInMillis resync period in milliseconds.
+   * @return {@link SharedIndexInformer} for GenericKubernetesResource
+   */
+  public synchronized SharedIndexInformer<GenericKubernetesResource> sharedIndexInformerForCustomResource(CustomResourceDefinitionContext genericResourceContext, long resyncPeriodInMillis) {
+    validateCustomResourceProvided(genericResourceContext);
+    return sharedIndexInformerFor(GenericKubernetesResource.class, GenericKubernetesResourceList.class, new OperationContext()
+      .withApiGroupName(genericResourceContext.getGroup())
+      .withApiGroupVersion(genericResourceContext.getVersion())
+      .withPlural(genericResourceContext.getPlural())
+      .withNamespace(this.namespace)
+      .withIsNamespaceConfiguredFromGlobalConfig(context.isNamespaceFromGlobalConfig()), resyncPeriodInMillis, genericResourceContext.isNamespaceScoped());
   }
 
   /**
@@ -178,7 +207,7 @@ public synchronized <T extends HasMetadata> SharedIndexInformer<T> sharedIndexIn
    */
   public synchronized <T extends CustomResource<?,?>> SharedIndexInformer<T> sharedIndexInformerForCustomResource(
     Class<T> apiTypeClass, OperationContext operationContext, long resyncPeriodInMillis) {
-    return sharedIndexInformerFor(apiTypeClass, inferListType(apiTypeClass), operationContext, resyncPeriodInMillis);
+    return sharedIndexInformerFor(apiTypeClass, inferListType(apiTypeClass), operationContext, resyncPeriodInMillis, Utils.isResourceNamespaced(apiTypeClass));
   }
 
   /**
@@ -208,7 +237,7 @@ public synchronized <T extends CustomResource<?,?>> SharedIndexInformer<T> share
    * @return the shared index informer
    */
   public synchronized <T extends CustomResource<?,?>, L extends KubernetesResourceList<T>> SharedIndexInformer<T> sharedIndexInformerForCustomResource(Class<T> apiTypeClass, Class<L> apiListTypeClass, long resyncPeriodInMillis) {
-    return sharedIndexInformerFor(apiTypeClass, apiListTypeClass, null, resyncPeriodInMillis);
+    return sharedIndexInformerFor(apiTypeClass, apiListTypeClass, null, resyncPeriodInMillis, Utils.isResourceNamespaced(apiTypeClass));
   }
 
   /**
@@ -224,8 +253,8 @@ public synchronized <T extends CustomResource<?,?>, L extends KubernetesResource
    * @param <L> the type's list parameter (should extend {@link io.fabric8.kubernetes.api.model.KubernetesResourceList}
    * @return the shared index informer
    */
-  private synchronized <T extends HasMetadata, L extends KubernetesResourceList<T>> SharedIndexInformer<T> sharedIndexInformerFor(Class<T> apiTypeClass, Class<L> apiListTypeClass, OperationContext operationContext, long resyncPeriodInMillis) {
-    ListerWatcher<T, L> listerWatcher = listerWatcherFor(apiTypeClass, apiListTypeClass);
+  private synchronized <T extends HasMetadata, L extends KubernetesResourceList<T>> SharedIndexInformer<T> sharedIndexInformerFor(Class<T> apiTypeClass, Class<L> apiListTypeClass, OperationContext operationContext, long resyncPeriodInMillis, boolean isResourceNamespaced) {
+    ListerWatcher<T, L> listerWatcher = listerWatcherFor(apiTypeClass, apiListTypeClass, isResourceNamespaced);
     OperationContext context = this.context.withApiGroupName(HasMetadata.getGroup(apiTypeClass))
       .withApiGroupVersion(HasMetadata.getVersion(apiTypeClass))
       .withPlural(HasMetadata.getPlural(apiTypeClass))
@@ -248,19 +277,19 @@ private synchronized <T extends HasMetadata, L extends KubernetesResourceList<T>
     return informer;
   }
 
-  private <T extends HasMetadata, L extends KubernetesResourceList<T>> ListerWatcher<T, L> listerWatcherFor(Class<T> apiTypeClass, Class<L> apiListTypeClass) {
+  private <T extends HasMetadata, L extends KubernetesResourceList<T>> ListerWatcher<T, L> listerWatcherFor(Class<T> apiTypeClass, Class<L> apiListTypeClass, boolean isResourceNamespaced) {
 
     return new ListerWatcher<T, L>() {
       @Override
       public L list(ListOptions params, String namespace, OperationContext context) {
-        BaseOperation<T, L, ?> listBaseOperation = getConfiguredBaseOperation(namespace, context, apiTypeClass, apiListTypeClass);
+        BaseOperation<T, L, ?> listBaseOperation = getConfiguredBaseOperation(namespace, context, apiTypeClass, apiListTypeClass, isResourceNamespaced);
         registerKindToKubernetesDeserializer(apiTypeClass);
         return listBaseOperation.list();
       }
 
       @Override
       public Watch watch(ListOptions params, String namespace, OperationContext context, Watcher<T> resourceWatcher) {
-        BaseOperation<T, L, ?> watchBaseOperation = getConfiguredBaseOperation(namespace, context, apiTypeClass, apiListTypeClass);
+        BaseOperation<T, L, ?> watchBaseOperation = getConfiguredBaseOperation(namespace, context, apiTypeClass, apiListTypeClass, isResourceNamespaced);
         registerKindToKubernetesDeserializer(apiTypeClass);
         return watchBaseOperation.watch(params.getResourceVersion(), resourceWatcher);
       }
@@ -372,23 +401,23 @@ private static <T> boolean isKeyOfType(String key, Class<T> apiTypeClass) {
     return key.contains(plural);
   }
 
-    private <T extends HasMetadata, L extends KubernetesResourceList<T>> BaseOperation<T, L, ?> getConfiguredBaseOperation(String namespace, OperationContext context, Class<T> apiTypeClass, Class<L> apiListTypeClass) {
-    BaseOperation<T, L, ?> baseOperationWithContext;
+  private <T extends HasMetadata, L extends KubernetesResourceList<T>> BaseOperation<T, L, ?> getConfiguredBaseOperation(String namespace, OperationContext context, Class<T> apiTypeClass, Class<L> apiListTypeClass, boolean isNamespacedScoped) {
+    SharedInformerOperationsImpl<T, L, Resource<T>> sharedInformerOperations;
     // Avoid adding Namespace if it's picked from Global Configuration
     if (context.isNamespaceFromGlobalConfig()) {
       // SharedInformer default behavior is to watch in all namespaces
       // unless we specify namespace explicitly in OperationContext
-      baseOperationWithContext = baseOperation.newInstance(context
+      sharedInformerOperations = new SharedInformerOperationsImpl<>(context
         .withConfig(new ConfigBuilder(config)
           .withNamespace(null)
           .build())
-        .withNamespace(null));
+        .withNamespace(null), isNamespacedScoped);
     } else {
-      baseOperationWithContext = baseOperation.newInstance(context.withNamespace(namespace));
+      sharedInformerOperations = new SharedInformerOperationsImpl<>(context.withNamespace(namespace), isNamespacedScoped);
     }
-    baseOperationWithContext.setType(apiTypeClass);
-    baseOperationWithContext.setListType(apiListTypeClass);
-    return baseOperationWithContext;
+    sharedInformerOperations.setType(apiTypeClass);
+    sharedInformerOperations.setListType(apiListTypeClass);
+    return sharedInformerOperations;
   }
 
   private void initOperationContext(Config configuration) {
@@ -402,4 +431,15 @@ private <T extends HasMetadata> void registerKindToKubernetesDeserializer(Class<
       KubernetesDeserializer.registerCustomKind(HasMetadata.getApiVersion(apiTypeClass), apiTypeClass.getSimpleName(), apiTypeClass);
     }
   }
+
+  private void validateCustomResourceProvided(CustomResourceDefinitionContext genericResourceContext) {
+    if (Utils.isNullOrEmpty(genericResourceContext.getKind())) {
+      throw new IllegalArgumentException("CustomResourceDefinitionContext.kind: required value.");
+    }
+    ResourceHandler<HasMetadata, ?> resourceHandler = Handlers.get(genericResourceContext.getKind(), ApiVersionUtil.joinApiGroupAndVersion(genericResourceContext.getGroup(), genericResourceContext.getVersion()));
+
+    if (resourceHandler != null) {
+      throw new IllegalArgumentException("Using sharedIndexInformerDynamicResource for core type. Please use sharedIndexInformerFor(Class<T>, long) instead.");
+    }
+  }
 }
diff --git a/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/utils/ApiVersionUtil.java b/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/utils/ApiVersionUtil.java
@@ -94,4 +94,18 @@ public static String trimGroupOrNull(String apiVersion) {
     }
     return null;
   }
+
+  /**
+   * Join group and version strings to form apiVersion key in Kubernetes objects
+   *
+   * @param group ApiGroup for resource
+   * @param version ApiVersion for resource
+   * @return version if group is null or empty, joined string otherwise.
+   */
+  public static String joinApiGroupAndVersion(String group, String version) {
+    if (Utils.isNullOrEmpty(group)) {
+      return version;
+    }
+    return group + "/" + version;
+  }
 }
diff --git a/.../test/java/io/fabric8/kubernetes/client/dsl/base/CustomResourceDefinitionContextTest.java b/.../test/java/io/fabric8/kubernetes/client/dsl/base/CustomResourceDefinitionContextTest.java
@@ -138,4 +138,15 @@ void fromCrdV1beta1OldVersionStyle() {
       .hasFieldOrPropertyWithValue("plural", "foobars")
       .hasFieldOrPropertyWithValue("kind", "Foobar");
   }
+
+  @Test
+  void isNamespaceScoped() {
+    // Given
+    CustomResourceDefinitionContext crdc1 = new CustomResourceDefinitionContext.Builder().withScope("Namespaced").build();
+    CustomResourceDefinitionContext crdc2 = new CustomResourceDefinitionContext.Builder().withScope("Cluster").build();
+
+    // When + Then
+    assertThat(crdc1.isNamespaceScoped()).isTrue();
+    assertThat(crdc2.isNamespaceScoped()).isFalse();
+  }
 }
diff --git a/...lient/src/test/java/io/fabric8/kubernetes/client/informers/SharedInformerFactoryTest.java b/...lient/src/test/java/io/fabric8/kubernetes/client/informers/SharedInformerFactoryTest.java
@@ -20,6 +20,7 @@
 import io.fabric8.kubernetes.client.Config;
 import io.fabric8.kubernetes.client.ConfigBuilder;
 import io.fabric8.kubernetes.client.CustomResource;
+import io.fabric8.kubernetes.client.dsl.base.CustomResourceDefinitionContext;
 import io.fabric8.kubernetes.client.dsl.base.OperationContext;
 import io.fabric8.kubernetes.model.annotation.Group;
 import io.fabric8.kubernetes.model.annotation.Kind;
@@ -33,6 +34,8 @@
 
 import static io.fabric8.kubernetes.client.informers.SharedInformerFactory.getInformerKey;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 class SharedInformerFactoryTest {
   private OkHttpClient mockClient;
@@ -98,6 +101,44 @@ void testInformersCreatedWithSameNameButDifferentCRDContext() {
       .hasSize(2);
   }
 
+  @Test
+  void testSharedIndexInformerForCustomResourceNoType() {
+    // Given
+    SharedInformerFactory sharedInformerFactory = new SharedInformerFactory(executorService, mockClient, config);
+    CustomResourceDefinitionContext context = new CustomResourceDefinitionContext.Builder()
+      .withKind("Dummy")
+      .withScope("Namespaced")
+      .withVersion("v1")
+      .withGroup("demos.fabric8.io")
+      .withPlural("dummies")
+      .build();
+
+    // When
+    sharedInformerFactory.inNamespace("ns1").sharedIndexInformerForCustomResource(context, 10 * 1000L);
+
+    // Then
+    assertThat(sharedInformerFactory.getInformers())
+      .hasSize(1)
+      .containsKey("demos.fabric8.io/v1/dummies/ns1");
+  }
+
+  @Test
+  void testSharedIndexInformerForCustomResourceThrowsIllegalArgumentExceptionOnCoreType() {
+    // Given
+    SharedInformerFactory sharedInformerFactory = new SharedInformerFactory(executorService, mockClient, config);
+    CustomResourceDefinitionContext context = new CustomResourceDefinitionContext.Builder()
+      .withKind("Service")
+      .withScope("Namespaced")
+      .withVersion("v1")
+      .withGroup("")
+      .withPlural("services")
+      .build();
+
+    // When + Then
+    IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> sharedInformerFactory.sharedIndexInformerForCustomResource(context, 10 * 1000L));
+    assertEquals("Using sharedIndexInformerDynamicResource for core type. Please use sharedIndexInformerFor(Class<T>, long) instead.", exception.getMessage());
+  }
+
   @Test
   void testGetExistingSharedIndexInformer() {
     // Given