Support to add/update/remove kubevirt node, and add node watcher
Change-Id: I3cae33625b2dd6deb88f7bca2d0252d65667f2c9
(cherry picked from commit b9eb11d5b7012ea1619f512b27766dc04f657f72)
diff --git a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/KubevirtNodeWatcher.java b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/KubevirtNodeWatcher.java
new file mode 100644
index 0000000..89086bf
--- /dev/null
+++ b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/KubevirtNodeWatcher.java
@@ -0,0 +1,240 @@
+/*
+ * Copyright 2021-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.kubevirtnode.impl;
+
+import io.fabric8.kubernetes.api.model.Node;
+import io.fabric8.kubernetes.client.KubernetesClient;
+import io.fabric8.kubernetes.client.Watcher;
+import io.fabric8.kubernetes.client.WatcherException;
+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.kubevirtnode.api.KubevirtApiConfig;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfigEvent;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfigListener;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfigService;
+import org.onosproject.kubevirtnode.api.KubevirtNode;
+import org.onosproject.kubevirtnode.api.KubevirtNodeAdminService;
+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.kubevirtnode.api.KubevirtNode.Type.WORKER;
+import static org.onosproject.kubevirtnode.api.KubevirtNodeService.APP_ID;
+import static org.onosproject.kubevirtnode.api.KubevirtNodeState.INIT;
+import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.buildKubevirtNode;
+import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.k8sClient;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Kubernetes node watcher used for feeding node information.
+ */
+@Component(immediate = true)
+public class KubevirtNodeWatcher {
+
+ 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 KubevirtNodeAdminService kubevirtNodeAdminService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected KubevirtApiConfigService kubevirtApiConfigService;
+
+ private final ExecutorService eventExecutor = newSingleThreadExecutor(
+ groupedThreads(this.getClass().getSimpleName(), "event-handler"));
+ private final Watcher<Node> internalKubevirtNodeWatcher = new InternalKubevirtNodeWatcher();
+ private final InternalKubevirtApiConfigListener
+ internalKubevirtApiConfigListener = new InternalKubevirtApiConfigListener();
+
+ private ApplicationId appId;
+ private NodeId localNodeId;
+
+ @Activate
+ protected void activate() {
+ appId = coreService.registerApplication(APP_ID);
+ localNodeId = clusterService.getLocalNode().id();
+ leadershipService.runForLeadership(appId.name());
+ kubevirtApiConfigService.addListener(internalKubevirtApiConfigListener);
+
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ kubevirtApiConfigService.removeListener(internalKubevirtApiConfigListener);
+ leadershipService.withdraw(appId.name());
+ eventExecutor.shutdown();
+
+ log.info("Stopped");
+ }
+
+ private void instantiateNodeWatcher() {
+ KubevirtApiConfig config = kubevirtApiConfigService.apiConfig();
+ if (config == null) {
+ return;
+ }
+ KubernetesClient client = k8sClient(config);
+
+ if (client != null) {
+ client.nodes().watch(internalKubevirtNodeWatcher);
+ }
+ }
+
+ private class InternalKubevirtApiConfigListener implements KubevirtApiConfigListener {
+
+ private boolean isRelevantHelper() {
+ return Objects.equals(localNodeId, leadershipService.getLeader(appId.name()));
+ }
+
+ @Override
+ public void event(KubevirtApiConfigEvent event) {
+
+ switch (event.type()) {
+ case KUBEVIRT_API_CONFIG_UPDATED:
+ eventExecutor.execute(this::processConfigUpdating);
+ break;
+ case KUBEVIRT_API_CONFIG_CREATED:
+ case KUBEVIRT_API_CONFIG_REMOVED:
+ default:
+ // do nothing
+ break;
+ }
+ }
+
+ private void processConfigUpdating() {
+ if (!isRelevantHelper()) {
+ return;
+ }
+
+ instantiateNodeWatcher();
+ }
+ }
+
+ private class InternalKubevirtNodeWatcher implements Watcher<Node> {
+
+ @Override
+ public void eventReceived(Action action, Node node) {
+ switch (action) {
+ case ADDED:
+ eventExecutor.execute(() -> processAddition(node));
+ break;
+ case MODIFIED:
+ eventExecutor.execute(() -> processModification(node));
+ break;
+ case DELETED:
+ eventExecutor.execute(() -> processDeletion(node));
+ break;
+ case ERROR:
+ log.warn("Failures processing node manipulation.");
+ break;
+ default:
+ // do nothing
+ break;
+ }
+ }
+
+ @Override
+ public void onClose(WatcherException e) {
+ // due to the bugs in fabric8, node watcher might be closed,
+ // we will re-instantiate the node watcher in this case
+ // FIXME: https://github.com/fabric8io/kubernetes-client/issues/2135
+ log.warn("Node watcher OnClose, re-instantiate the node watcher...");
+ instantiateNodeWatcher();
+ }
+
+ private void processAddition(Node node) {
+ if (!isMaster()) {
+ return;
+ }
+
+ log.trace("Process node {} creating event from API server.",
+ node.getMetadata().getName());
+
+ KubevirtNode kubevirtNode = buildKubevirtNode(node);
+ if (kubevirtNode.type() == WORKER) {
+ if (!kubevirtNodeAdminService.hasNode(kubevirtNode.hostname())) {
+ kubevirtNodeAdminService.createNode(kubevirtNode);
+ }
+ }
+ }
+
+ private void processModification(Node node) {
+ if (!isMaster()) {
+ return;
+ }
+
+ log.trace("Process node {} updating event from API server.",
+ node.getMetadata().getName());
+
+ KubevirtNode existing = kubevirtNodeAdminService.node(node.getMetadata().getName());
+
+ if (existing != null) {
+ KubevirtNode kubevirtNode = buildKubevirtNode(node);
+
+ // we update the kubevirt node and re-run bootstrapping,
+ // only if the updated node has different phyInts and data IP
+ // this means we assume that the node's hostname, type and mgmt IP
+ // are immutable
+ if (!kubevirtNode.phyIntfs().equals(existing.phyIntfs()) ||
+ !kubevirtNode.dataIp().equals(existing.dataIp())) {
+ kubevirtNodeAdminService.updateNode(kubevirtNode.updateState(INIT));
+ }
+ }
+ }
+
+ private void processDeletion(Node node) {
+ if (!isMaster()) {
+ return;
+ }
+
+ log.trace("Process node {} removal event from API server.",
+ node.getMetadata().getName());
+
+ KubevirtNode existing = kubevirtNodeAdminService.node(node.getMetadata().getName());
+
+ if (existing != null) {
+ kubevirtNodeAdminService.removeNode(node.getMetadata().getName());
+ }
+ }
+
+ private boolean isMaster() {
+ return Objects.equals(localNodeId, leadershipService.getLeader(appId.name()));
+ }
+ }
+}