Implement kubernetes pod, service and endpoints watcher
Change-Id: I0c364f370de9599b124f0e85f093099e8b4d97f3
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sEndpointsWatcher.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sEndpointsWatcher.java
new file mode 100644
index 0000000..371a34a
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sEndpointsWatcher.java
@@ -0,0 +1,184 @@
+/*
+ * 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 io.fabric8.kubernetes.api.model.Endpoints;
+import io.fabric8.kubernetes.client.KubernetesClient;
+import io.fabric8.kubernetes.client.KubernetesClientException;
+import io.fabric8.kubernetes.client.Watcher;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.LeadershipService;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.k8snetworking.api.K8sEndpointsAdminService;
+import org.onosproject.k8snode.api.K8sApiConfig;
+import org.onosproject.k8snode.api.K8sApiConfigService;
+import org.onosproject.mastership.MastershipService;
+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.Objects;
+import java.util.concurrent.ExecutorService;
+
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.k8snetworking.api.Constants.K8S_NETWORKING_APP_ID;
+import static org.onosproject.k8snetworking.util.K8sNetworkingUtil.k8sClient;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Kubernetes endpoints watcher used for feeding endpoints information.
+ */
+@Component(immediate = true)
+public class K8sEndpointsWatcher {
+
+ private final Logger log = getLogger(getClass());
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected CoreService coreService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected MastershipService mastershipService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected ClusterService clusterService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected LeadershipService leadershipService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected K8sEndpointsAdminService k8sEndpointsAdminService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected K8sApiConfigService k8sApiConfigService;
+
+ private final ExecutorService eventExecutor = newSingleThreadExecutor(
+ groupedThreads(this.getClass().getSimpleName(), "event-handler"));
+ private final Watcher<Endpoints>
+ internalEndpointsWatcher = new InternalK8sEndpointsWatcher();
+
+
+ private ApplicationId appId;
+ private NodeId localNodeId;
+
+ @Activate
+ protected void activate() {
+ appId = coreService.registerApplication(K8S_NETWORKING_APP_ID);
+ localNodeId = clusterService.getLocalNode().id();
+ leadershipService.runForLeadership(appId.name());
+
+ initWatcher();
+
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ leadershipService.withdraw(appId.name());
+ eventExecutor.shutdown();
+
+ log.info("Stopped");
+ }
+
+ private void initWatcher() {
+ K8sApiConfig config =
+ k8sApiConfigService.apiConfigs().stream().findAny().orElse(null);
+ if (config == null) {
+ log.error("Failed to find valid kubernetes API configuration.");
+ return;
+ }
+
+ KubernetesClient client = k8sClient(config);
+
+ if (client == null) {
+ log.error("Failed to connect to kubernetes API server.");
+ return;
+ }
+
+ client.endpoints().watch(internalEndpointsWatcher);
+ }
+
+ private class InternalK8sEndpointsWatcher implements Watcher<Endpoints> {
+
+ @Override
+ public void eventReceived(Action action, Endpoints endpoints) {
+ switch (action) {
+ case ADDED:
+ eventExecutor.execute(() -> processAddition(endpoints));
+ break;
+ case MODIFIED:
+ eventExecutor.execute(() -> processModification(endpoints));
+ break;
+ case DELETED:
+ eventExecutor.execute(() -> processDeletion(endpoints));
+ break;
+ case ERROR:
+ log.warn("Failures processing endpoints manipulation.");
+ break;
+ default:
+ // do nothing
+ break;
+ }
+ }
+
+ @Override
+ public void onClose(KubernetesClientException e) {
+ log.info("Endpoints watcher OnClose: {}" + e);
+ }
+
+ private void processAddition(Endpoints endpoints) {
+ if (!isMaster()) {
+ return;
+ }
+
+ log.info("Process endpoints {} creating event from API server.",
+ endpoints.getMetadata().getName());
+
+ k8sEndpointsAdminService.createEndpoints(endpoints);
+ }
+
+ private void processModification(Endpoints endpoints) {
+ if (!isMaster()) {
+ return;
+ }
+
+ log.info("Process endpoints {} updating event from API server.",
+ endpoints.getMetadata().getName());
+
+ k8sEndpointsAdminService.updateEndpoints(endpoints);
+ }
+
+ private void processDeletion(Endpoints endpoints) {
+ if (!isMaster()) {
+ return;
+ }
+
+ log.info("Process endpoints {} removal event from API server.",
+ endpoints.getMetadata().getName());
+
+ k8sEndpointsAdminService.removeEndpoints(endpoints.getMetadata().getUid());
+ }
+
+ private boolean isMaster() {
+ return Objects.equals(localNodeId, leadershipService.getLeader(appId.name()));
+ }
+ }
+}