[ONOS-7926] Implement IPAM service to allocate IP for Kubernetes POD
Change-Id: I32fd1fffb41ec728d0be092ac5a8f555179e7a9e
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sIpamHandler.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sIpamHandler.java
new file mode 100644
index 0000000..5591d2e
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sIpamHandler.java
@@ -0,0 +1,136 @@
+/*
+ * 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 org.onlab.packet.IpAddress;
+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.K8sIpamAdminService;
+import org.onosproject.k8snetworking.api.K8sNetworkEvent;
+import org.onosproject.k8snetworking.api.K8sNetworkListener;
+import org.onosproject.k8snetworking.api.K8sNetworkService;
+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.Set;
+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.getSubnetIps;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Initializes and purges the kubernetes IPAM.
+ */
+@Component(immediate = true)
+public class K8sIpamHandler {
+
+ 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 K8sNetworkService k8sNetworkService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected K8sIpamAdminService k8sIpamAdminService;
+
+ private final ExecutorService eventExecutor = newSingleThreadExecutor(
+ groupedThreads(this.getClass().getSimpleName(), "event-handler"));
+ private final InternalK8sNetworkListener k8sNetworkListener =
+ new InternalK8sNetworkListener();
+
+ 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());
+ k8sNetworkService.addListener(k8sNetworkListener);
+
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ k8sNetworkService.removeListener(k8sNetworkListener);
+ leadershipService.withdraw(appId.name());
+ eventExecutor.shutdown();
+
+ log.info("Stopped");
+ }
+
+ private class InternalK8sNetworkListener implements K8sNetworkListener {
+
+ private boolean isRelevantHelper() {
+ return Objects.equals(localNodeId, leadershipService.getLeader(appId.name()));
+ }
+
+ @Override
+ public void event(K8sNetworkEvent event) {
+ switch (event.type()) {
+ case K8S_NETWORK_CREATED:
+ eventExecutor.execute(() -> processNetworkAddition(event));
+ break;
+ case K8S_NETWORK_REMOVED:
+ eventExecutor.execute(() -> processNetworkRemoval(event));
+ break;
+ default:
+ break;
+ }
+ }
+
+ private void processNetworkAddition(K8sNetworkEvent event) {
+ if (!isRelevantHelper()) {
+ return;
+ }
+
+ Set<IpAddress> ips = getSubnetIps(event.subject().cidr());
+ k8sIpamAdminService.initializeIpPool(event.subject().networkId(), ips);
+ }
+
+ private void processNetworkRemoval(K8sNetworkEvent event) {
+ if (!isRelevantHelper()) {
+ return;
+ }
+
+ k8sIpamAdminService.purgeIpPool(event.subject().networkId());
+ }
+ }
+}