[ONOS-8014] Implement kubernetes namespace store and manager
Change-Id: I86200d9a49a7935738e6599829d297196ab50131
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sNamespaceStore.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sNamespaceStore.java
new file mode 100644
index 0000000..a60354a
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sNamespaceStore.java
@@ -0,0 +1,185 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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 org.onosproject.k8snetworking.impl;
+
+import com.google.common.collect.ImmutableSet;
+import io.fabric8.kubernetes.api.model.Namespace;
+import io.fabric8.kubernetes.api.model.NamespaceSpec;
+import io.fabric8.kubernetes.api.model.NamespaceStatus;
+import io.fabric8.kubernetes.api.model.ObjectMeta;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.k8snetworking.api.K8sNamespaceEvent;
+import org.onosproject.k8snetworking.api.K8sNamespaceStore;
+import org.onosproject.k8snetworking.api.K8sNamespaceStoreDelegate;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.MapEvent;
+import org.onosproject.store.service.MapEventListener;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
+import org.slf4j.Logger;
+
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.k8snetworking.api.K8sNamespaceEvent.Type.K8S_NAMESPACE_CREATED;
+import static org.onosproject.k8snetworking.api.K8sNamespaceEvent.Type.K8S_NAMESPACE_REMOVED;
+import static org.onosproject.k8snetworking.api.K8sNamespaceEvent.Type.K8S_NAMESPACE_UPDATED;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of kubernetes namespace store using consistent map.
+ */
+@Component(immediate = true, service = K8sNamespaceStore.class)
+public class DistributedK8sNamespaceStore
+ extends AbstractStore<K8sNamespaceEvent, K8sNamespaceStoreDelegate>
+ implements K8sNamespaceStore {
+
+ private final Logger log = getLogger(getClass());
+
+ private static final String ERR_NOT_FOUND = " does not exist";
+ private static final String ERR_DUPLICATE = " already exists";
+ private static final String APP_ID = "org.onosproject.k8snetwork";
+
+ private static final KryoNamespace
+ SERIALIZER_K8S_NAMESPACE = KryoNamespace.newBuilder()
+ .register(KryoNamespaces.API)
+ .register(Namespace.class)
+ .register(ObjectMeta.class)
+ .register(NamespaceSpec.class)
+ .register(NamespaceStatus.class)
+ .build();
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected CoreService coreService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected StorageService storageService;
+
+ private final ExecutorService eventExecutor = newSingleThreadExecutor(
+ groupedThreads(this.getClass().getSimpleName(), "event-handler", log));
+
+ private final MapEventListener<String, Namespace> namespaceMapListener =
+ new K8sNamespaceMapListener();
+
+ private ConsistentMap<String, Namespace> namespaceStore;
+
+ @Activate
+ protected void activate() {
+ ApplicationId appId = coreService.registerApplication(APP_ID);
+ namespaceStore = storageService.<String, Namespace>consistentMapBuilder()
+ .withSerializer(Serializer.using(SERIALIZER_K8S_NAMESPACE))
+ .withName("k8s-namespace-store")
+ .withApplicationId(appId)
+ .build();
+
+ namespaceStore.addListener(namespaceMapListener);
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ namespaceStore.removeListener(namespaceMapListener);
+ eventExecutor.shutdown();
+ log.info("Stopped");
+ }
+
+ @Override
+ public void createNamespace(Namespace namespace) {
+ namespaceStore.compute(namespace.getMetadata().getUid(), (uid, existing) -> {
+ final String error = namespace.getMetadata().getUid() + ERR_DUPLICATE;
+ checkArgument(existing == null, error);
+ return namespace;
+ });
+ }
+
+ @Override
+ public void updateNamespace(Namespace namespace) {
+ namespaceStore.compute(namespace.getMetadata().getUid(), (uid, existing) -> {
+ final String error = namespace.getMetadata().getUid() + ERR_NOT_FOUND;
+ checkArgument(existing != null, error);
+ return namespace;
+ });
+ }
+
+ @Override
+ public Namespace removeNamespace(String uid) {
+ Versioned<Namespace> namespace = namespaceStore.remove(uid);
+ if (namespace == null) {
+ final String error = uid + ERR_NOT_FOUND;
+ throw new IllegalArgumentException(error);
+ }
+ return namespace.value();
+ }
+
+ @Override
+ public Namespace namespace(String uid) {
+ return namespaceStore.asJavaMap().get(uid);
+ }
+
+ @Override
+ public Set<Namespace> namespaces() {
+ return ImmutableSet.copyOf(namespaceStore.asJavaMap().values());
+ }
+
+ @Override
+ public void clear() {
+ namespaceStore.clear();
+ }
+
+ private class K8sNamespaceMapListener implements MapEventListener<String, Namespace> {
+
+ @Override
+ public void event(MapEvent<String, Namespace> event) {
+
+ switch (event.type()) {
+ case INSERT:
+ log.debug("Kubernetes namespace created {}", event.newValue());
+ eventExecutor.execute(() ->
+ notifyDelegate(new K8sNamespaceEvent(
+ K8S_NAMESPACE_CREATED, event.newValue().value())));
+ break;
+ case UPDATE:
+ log.debug("Kubernetes namespace updated {}", event.newValue());
+ eventExecutor.execute(() ->
+ notifyDelegate(new K8sNamespaceEvent(
+ K8S_NAMESPACE_UPDATED, event.newValue().value())));
+ break;
+ case REMOVE:
+ log.debug("Kubernetes namespace removed {}", event.oldValue());
+ eventExecutor.execute(() ->
+ notifyDelegate(new K8sNamespaceEvent(
+ K8S_NAMESPACE_REMOVED, event.oldValue().value())));
+ break;
+ default:
+ // do nothing
+ break;
+ }
+ }
+ }
+}