Jian Li | ac31f65 | 2021-01-17 02:18:30 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2021-present Open Networking Foundation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.kubevirtnetworking.impl; |
| 17 | |
| 18 | import io.fabric8.kubernetes.api.model.Pod; |
| 19 | import io.fabric8.kubernetes.client.KubernetesClient; |
| 20 | import io.fabric8.kubernetes.client.Watcher; |
| 21 | import io.fabric8.kubernetes.client.WatcherException; |
| 22 | import org.onosproject.cluster.ClusterService; |
| 23 | import org.onosproject.cluster.LeadershipService; |
| 24 | import org.onosproject.cluster.NodeId; |
| 25 | import org.onosproject.core.ApplicationId; |
| 26 | import org.onosproject.core.CoreService; |
| 27 | import org.onosproject.kubevirtnetworking.api.KubevirtPodAdminService; |
| 28 | import org.onosproject.kubevirtnode.api.KubevirtApiConfigEvent; |
| 29 | import org.onosproject.kubevirtnode.api.KubevirtApiConfigListener; |
| 30 | import org.onosproject.kubevirtnode.api.KubevirtApiConfigService; |
| 31 | import org.onosproject.mastership.MastershipService; |
| 32 | import org.osgi.service.component.annotations.Activate; |
| 33 | import org.osgi.service.component.annotations.Component; |
| 34 | import org.osgi.service.component.annotations.Deactivate; |
| 35 | import org.osgi.service.component.annotations.Reference; |
| 36 | import org.osgi.service.component.annotations.ReferenceCardinality; |
| 37 | import org.slf4j.Logger; |
| 38 | |
| 39 | import java.util.Objects; |
| 40 | import java.util.concurrent.ExecutorService; |
| 41 | |
| 42 | import static java.util.concurrent.Executors.newSingleThreadExecutor; |
| 43 | import static org.onlab.util.Tools.groupedThreads; |
| 44 | import static org.onosproject.kubevirtnetworking.api.Constants.KUBEVIRT_NETWORKING_APP_ID; |
| 45 | import static org.onosproject.kubevirtnetworking.util.KubevirtNetworkingUtil.k8sClient; |
| 46 | import static org.slf4j.LoggerFactory.getLogger; |
| 47 | |
| 48 | /** |
| 49 | * Kubernetes pod watcher used for feeding pod information. |
| 50 | */ |
| 51 | @Component(immediate = true) |
| 52 | public class KubevirtPodWatcher { |
| 53 | |
| 54 | private final Logger log = getLogger(getClass()); |
| 55 | |
| 56 | @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| 57 | protected CoreService coreService; |
| 58 | |
| 59 | @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| 60 | protected MastershipService mastershipService; |
| 61 | |
| 62 | @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| 63 | protected ClusterService clusterService; |
| 64 | |
| 65 | @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| 66 | protected LeadershipService leadershipService; |
| 67 | |
| 68 | @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| 69 | protected KubevirtPodAdminService kubevirtPodAdminService; |
| 70 | |
| 71 | @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| 72 | protected KubevirtApiConfigService kubevirtApiConfigService; |
| 73 | |
| 74 | private final ExecutorService eventExecutor = newSingleThreadExecutor( |
| 75 | groupedThreads(this.getClass().getSimpleName(), "event-handler")); |
| 76 | private final Watcher<Pod> internalKubevirtPodWatcher = new InternalKubevirtPodWatcher(); |
| 77 | private final InternalKubevirtApiConfigListener |
| 78 | internalKubevirtApiConfigListener = new InternalKubevirtApiConfigListener(); |
| 79 | |
| 80 | private ApplicationId appId; |
| 81 | private NodeId localNodeId; |
| 82 | |
| 83 | @Activate |
| 84 | protected void activate() { |
| 85 | appId = coreService.registerApplication(KUBEVIRT_NETWORKING_APP_ID); |
| 86 | localNodeId = clusterService.getLocalNode().id(); |
| 87 | leadershipService.runForLeadership(appId.name()); |
| 88 | kubevirtApiConfigService.addListener(internalKubevirtApiConfigListener); |
| 89 | |
| 90 | log.info("Started"); |
| 91 | } |
| 92 | |
| 93 | @Deactivate |
| 94 | protected void deactivate() { |
| 95 | kubevirtApiConfigService.removeListener(internalKubevirtApiConfigListener); |
| 96 | leadershipService.withdraw(appId.name()); |
| 97 | eventExecutor.shutdown(); |
| 98 | |
| 99 | log.info("Stopped"); |
| 100 | } |
| 101 | |
Jian Li | d2ade0f | 2021-02-19 14:00:07 +0900 | [diff] [blame] | 102 | private void instantiatePodWatcher() { |
| 103 | KubernetesClient client = k8sClient(kubevirtApiConfigService); |
| 104 | |
| 105 | if (client != null) { |
| 106 | client.pods().inAnyNamespace().watch(internalKubevirtPodWatcher); |
| 107 | } |
| 108 | } |
| 109 | |
Jian Li | ac31f65 | 2021-01-17 02:18:30 +0900 | [diff] [blame] | 110 | private class InternalKubevirtApiConfigListener implements KubevirtApiConfigListener { |
| 111 | |
| 112 | private boolean isRelevantHelper() { |
| 113 | return Objects.equals(localNodeId, leadershipService.getLeader(appId.name())); |
| 114 | } |
| 115 | |
| 116 | @Override |
| 117 | public void event(KubevirtApiConfigEvent event) { |
| 118 | |
| 119 | switch (event.type()) { |
| 120 | case KUBEVIRT_API_CONFIG_UPDATED: |
| 121 | eventExecutor.execute(this::processConfigUpdating); |
| 122 | break; |
| 123 | case KUBEVIRT_API_CONFIG_CREATED: |
| 124 | case KUBEVIRT_API_CONFIG_REMOVED: |
| 125 | default: |
| 126 | // do nothing |
| 127 | break; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | private void processConfigUpdating() { |
| 132 | if (!isRelevantHelper()) { |
| 133 | return; |
| 134 | } |
| 135 | |
Jian Li | d2ade0f | 2021-02-19 14:00:07 +0900 | [diff] [blame] | 136 | instantiatePodWatcher(); |
Jian Li | ac31f65 | 2021-01-17 02:18:30 +0900 | [diff] [blame] | 137 | } |
| 138 | } |
| 139 | |
| 140 | private class InternalKubevirtPodWatcher implements Watcher<Pod> { |
| 141 | |
| 142 | @Override |
| 143 | public void eventReceived(Action action, Pod pod) { |
| 144 | switch (action) { |
| 145 | case ADDED: |
| 146 | eventExecutor.execute(() -> processAddition(pod)); |
| 147 | break; |
| 148 | case MODIFIED: |
| 149 | eventExecutor.execute(() -> processModification(pod)); |
| 150 | break; |
| 151 | case DELETED: |
| 152 | eventExecutor.execute(() -> processDeletion(pod)); |
| 153 | break; |
| 154 | case ERROR: |
| 155 | log.warn("Failures processing pod manipulation."); |
| 156 | break; |
| 157 | default: |
| 158 | break; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | @Override |
| 163 | public void onClose(WatcherException e) { |
Jian Li | d2ade0f | 2021-02-19 14:00:07 +0900 | [diff] [blame] | 164 | // due to the bugs in fabric8, pod watcher might be closed, |
| 165 | // we will re-instantiate the pod watcher in this case |
| 166 | // FIXME: https://github.com/fabric8io/kubernetes-client/issues/2135 |
| 167 | log.warn("Pod watcher OnClose, re-instantiate the POD watcher..."); |
| 168 | instantiatePodWatcher(); |
Jian Li | ac31f65 | 2021-01-17 02:18:30 +0900 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | private void processAddition(Pod pod) { |
| 172 | if (!isMaster()) { |
| 173 | return; |
| 174 | } |
| 175 | |
| 176 | log.trace("Process pod {} creating event from API server.", |
| 177 | pod.getMetadata().getName()); |
| 178 | |
| 179 | if (kubevirtPodAdminService.pod(pod.getMetadata().getUid()) == null) { |
| 180 | kubevirtPodAdminService.createPod(pod); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | private void processModification(Pod pod) { |
| 185 | if (!isMaster()) { |
| 186 | return; |
| 187 | } |
| 188 | |
| 189 | log.trace("Process pod {} updating event from API server.", |
| 190 | pod.getMetadata().getName()); |
| 191 | |
| 192 | if (kubevirtPodAdminService.pod(pod.getMetadata().getUid()) != null) { |
| 193 | kubevirtPodAdminService.updatePod(pod); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | private void processDeletion(Pod pod) { |
| 198 | if (!isMaster()) { |
| 199 | return; |
| 200 | } |
| 201 | |
| 202 | log.trace("Process pod {} removal event from API server.", |
| 203 | pod.getMetadata().getName()); |
| 204 | |
| 205 | kubevirtPodAdminService.removePod(pod.getMetadata().getUid()); |
| 206 | } |
| 207 | |
| 208 | private boolean isMaster() { |
| 209 | return Objects.equals(localNodeId, leadershipService.getLeader(appId.name())); |
| 210 | } |
| 211 | } |
| 212 | } |