Support to store and monitor kubevirt POD resource

Change-Id: I2b484a806549620c5b1352da63061cd850b0284c
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListPodCommand.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListPodCommand.java
new file mode 100644
index 0000000..2ad937a
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/cli/KubevirtListPodCommand.java
@@ -0,0 +1,97 @@
+/*
+ * 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.kubevirtnetworking.cli;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import io.fabric8.kubernetes.api.model.Pod;
+import io.fabric8.kubernetes.client.utils.Serialization;
+import org.apache.commons.lang.StringUtils;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodService;
+
+import java.io.IOException;
+import java.util.Comparator;
+import java.util.List;
+
+import static org.onosproject.kubevirtnetworking.api.Constants.CLI_IP_ADDRESS_LENGTH;
+import static org.onosproject.kubevirtnetworking.api.Constants.CLI_MARGIN_LENGTH;
+import static org.onosproject.kubevirtnetworking.api.Constants.CLI_NAMESPACE_LENGTH;
+import static org.onosproject.kubevirtnetworking.api.Constants.CLI_NAME_LENGTH;
+import static org.onosproject.kubevirtnetworking.api.Constants.CLI_STATUS_LENGTH;
+import static org.onosproject.kubevirtnetworking.util.KubevirtNetworkingUtil.genFormatString;
+import static org.onosproject.kubevirtnetworking.util.KubevirtNetworkingUtil.prettyJson;
+
+/**
+ * Lists kubevirt pods.
+ */
+@Service
+@Command(scope = "onos", name = "kubevirt-pods",
+        description = "Lists all kubevirt pods")
+public class KubevirtListPodCommand extends AbstractShellCommand {
+    @Override
+    protected void doExecute() throws Exception {
+        KubevirtPodService service = get(KubevirtPodService.class);
+        List<Pod> pods = Lists.newArrayList(service.pods());
+        pods.sort(Comparator.comparing(p -> p.getMetadata().getName()));
+
+        String format = genFormatString(ImmutableList.of(CLI_NAME_LENGTH,
+                CLI_NAMESPACE_LENGTH, CLI_STATUS_LENGTH, CLI_IP_ADDRESS_LENGTH));
+
+        if (outputJson()) {
+            print("%s", json(pods));
+        } else {
+            print(format, "Name", "Namespace", "Status", "IP Address");
+
+            for (Pod pod : pods) {
+
+                List<String> containers = Lists.newArrayList();
+
+                pod.getSpec().getContainers().forEach(c -> containers.add(c.getName()));
+
+                print(format,
+                        StringUtils.substring(pod.getMetadata().getName(),
+                                0, CLI_NAME_LENGTH - CLI_MARGIN_LENGTH),
+                        StringUtils.substring(pod.getMetadata().getNamespace(),
+                                0, CLI_NAMESPACE_LENGTH - CLI_MARGIN_LENGTH),
+                        pod.getStatus().getPhase(),
+                        StringUtils.substring(pod.getStatus().getPodIP(),
+                                0, CLI_IP_ADDRESS_LENGTH - CLI_MARGIN_LENGTH));
+            }
+        }
+    }
+
+    private String json(List<Pod> pods) {
+        ObjectMapper mapper = new ObjectMapper();
+        ArrayNode result = mapper.createArrayNode();
+        try {
+            for (Pod pod : pods) {
+                ObjectNode json = (ObjectNode) new ObjectMapper()
+                        .readTree(Serialization.asJson(pod));
+                result.add(json);
+            }
+            return prettyJson(mapper, result.toString());
+        } catch (IOException e) {
+            log.warn("Failed to parse POD's JSON string.");
+            return "";
+        }
+    }
+}
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/DistributedKubevirtPodStore.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/DistributedKubevirtPodStore.java
new file mode 100644
index 0000000..3b1a2fc
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/DistributedKubevirtPodStore.java
@@ -0,0 +1,365 @@
+/*
+ * 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.kubevirtnetworking.impl;
+
+import com.google.common.collect.ImmutableSet;
+import io.fabric8.kubernetes.api.model.Affinity;
+import io.fabric8.kubernetes.api.model.Capabilities;
+import io.fabric8.kubernetes.api.model.ConfigMapEnvSource;
+import io.fabric8.kubernetes.api.model.ConfigMapKeySelector;
+import io.fabric8.kubernetes.api.model.ConfigMapVolumeSource;
+import io.fabric8.kubernetes.api.model.Container;
+import io.fabric8.kubernetes.api.model.ContainerPort;
+import io.fabric8.kubernetes.api.model.ContainerState;
+import io.fabric8.kubernetes.api.model.ContainerStateRunning;
+import io.fabric8.kubernetes.api.model.ContainerStateTerminated;
+import io.fabric8.kubernetes.api.model.ContainerStateWaiting;
+import io.fabric8.kubernetes.api.model.ContainerStatus;
+import io.fabric8.kubernetes.api.model.EmptyDirVolumeSource;
+import io.fabric8.kubernetes.api.model.EnvFromSource;
+import io.fabric8.kubernetes.api.model.EnvVar;
+import io.fabric8.kubernetes.api.model.EnvVarSource;
+import io.fabric8.kubernetes.api.model.ExecAction;
+import io.fabric8.kubernetes.api.model.FieldsV1;
+import io.fabric8.kubernetes.api.model.HTTPGetAction;
+import io.fabric8.kubernetes.api.model.HTTPHeader;
+import io.fabric8.kubernetes.api.model.HostPathVolumeSource;
+import io.fabric8.kubernetes.api.model.IntOrString;
+import io.fabric8.kubernetes.api.model.KeyToPath;
+import io.fabric8.kubernetes.api.model.LabelSelector;
+import io.fabric8.kubernetes.api.model.LabelSelectorRequirement;
+import io.fabric8.kubernetes.api.model.Lifecycle;
+import io.fabric8.kubernetes.api.model.ManagedFieldsEntry;
+import io.fabric8.kubernetes.api.model.NodeAffinity;
+import io.fabric8.kubernetes.api.model.NodeSelector;
+import io.fabric8.kubernetes.api.model.NodeSelectorRequirement;
+import io.fabric8.kubernetes.api.model.NodeSelectorTerm;
+import io.fabric8.kubernetes.api.model.ObjectFieldSelector;
+import io.fabric8.kubernetes.api.model.ObjectMeta;
+import io.fabric8.kubernetes.api.model.OwnerReference;
+import io.fabric8.kubernetes.api.model.PersistentVolumeClaimVolumeSource;
+import io.fabric8.kubernetes.api.model.Pod;
+import io.fabric8.kubernetes.api.model.PodAffinity;
+import io.fabric8.kubernetes.api.model.PodAffinityTerm;
+import io.fabric8.kubernetes.api.model.PodAntiAffinity;
+import io.fabric8.kubernetes.api.model.PodCondition;
+import io.fabric8.kubernetes.api.model.PodIP;
+import io.fabric8.kubernetes.api.model.PodSecurityContext;
+import io.fabric8.kubernetes.api.model.PodSpec;
+import io.fabric8.kubernetes.api.model.PodStatus;
+import io.fabric8.kubernetes.api.model.PreferredSchedulingTerm;
+import io.fabric8.kubernetes.api.model.Probe;
+import io.fabric8.kubernetes.api.model.Quantity;
+import io.fabric8.kubernetes.api.model.ResourceFieldSelector;
+import io.fabric8.kubernetes.api.model.ResourceRequirements;
+import io.fabric8.kubernetes.api.model.SELinuxOptions;
+import io.fabric8.kubernetes.api.model.SecretEnvSource;
+import io.fabric8.kubernetes.api.model.SecretKeySelector;
+import io.fabric8.kubernetes.api.model.SecretVolumeSource;
+import io.fabric8.kubernetes.api.model.SecurityContext;
+import io.fabric8.kubernetes.api.model.TCPSocketAction;
+import io.fabric8.kubernetes.api.model.Toleration;
+import io.fabric8.kubernetes.api.model.Volume;
+import io.fabric8.kubernetes.api.model.VolumeDevice;
+import io.fabric8.kubernetes.api.model.VolumeMount;
+import io.fabric8.kubernetes.api.model.WeightedPodAffinityTerm;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodEvent;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodStore;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodStoreDelegate;
+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.Collection;
+import java.util.LinkedHashMap;
+import java.util.Map;
+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.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_ANNOTATION_ADDED;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_COMPLETED;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_CRASH_LOOP_BACK_OFF;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_CREATED;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_FAILED;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_PENDING;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_REMOVED;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_RUNNING;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_SUCCEEDED;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_UNKNOWN;
+import static org.onosproject.kubevirtnetworking.api.KubevirtPodEvent.Type.KUBEVIRT_POD_UPDATED;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of kubevirt pod store using consistent map.
+ */
+@Component(immediate = true, service = KubevirtPodStore.class)
+public class DistributedKubevirtPodStore
+        extends AbstractStore<KubevirtPodEvent, KubevirtPodStoreDelegate>
+        implements KubevirtPodStore {
+    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 String PENDING = "Pending";
+    private static final String RUNNING = "Running";
+    private static final String SUCCEEDED = "Succeeded";
+    private static final String FAILED = "Failed";
+    private static final String UNKNOWN = "Unknown";
+    private static final String COMPLETED = "Completed";
+    private static final String CRASH_LOOP_BACK_OFF = "CrashLoopBackOff";
+
+    private static final KryoNamespace
+            SERIALIZER_K8S_POD = KryoNamespace.newBuilder()
+            .register(KryoNamespaces.API)
+            .register(Pod.class)
+            .register(ObjectMeta.class)
+            .register(PodSpec.class)
+            .register(PodStatus.class)
+            .register(PodCondition.class)
+            .register(PodIP.class)
+            .register(Container.class)
+            .register(EnvVar.class)
+            .register(EnvVarSource.class)
+            .register(EnvFromSource.class)
+            .register(ConfigMapEnvSource.class)
+            .register(ConfigMapKeySelector.class)
+            .register(ObjectFieldSelector.class)
+            .register(ResourceFieldSelector.class)
+            .register(SecretKeySelector.class)
+            .register(Lifecycle.class)
+            .register(SecretEnvSource.class)
+            .register(ContainerStatus.class)
+            .register(ContainerState.class)
+            .register(ContainerStateRunning.class)
+            .register(ContainerStateTerminated.class)
+            .register(ContainerStateWaiting.class)
+            .register(OwnerReference.class)
+            .register(Probe.class)
+            .register(ExecAction.class)
+            .register(HTTPGetAction.class)
+            .register(HTTPHeader.class)
+            .register(TCPSocketAction.class)
+            .register(ContainerPort.class)
+            .register(ResourceRequirements.class)
+            .register(SecurityContext.class)
+            .register(PodSecurityContext.class)
+            .register(SELinuxOptions.class)
+            .register(Volume.class)
+            .register(VolumeDevice.class)
+            .register(VolumeMount.class)
+            .register(IntOrString.class)
+            .register(Toleration.class)
+            .register(PersistentVolumeClaimVolumeSource.class)
+            .register(SecretVolumeSource.class)
+            .register(EmptyDirVolumeSource.class)
+            .register(Quantity.class)
+            .register(Capabilities.class)
+            .register(ConfigMapVolumeSource.class)
+            .register(KeyToPath.class)
+            .register(HostPathVolumeSource.class)
+            .register(Affinity.class)
+            .register(NodeAffinity.class)
+            .register(NodeSelector.class)
+            .register(NodeSelectorTerm.class)
+            .register(NodeSelectorRequirement.class)
+            .register(PreferredSchedulingTerm.class)
+            .register(PodAffinity.class)
+            .register(WeightedPodAffinityTerm.class)
+            .register(PodAffinityTerm.class)
+            .register(LabelSelector.class)
+            .register(LabelSelectorRequirement.class)
+            .register(PodAntiAffinity.class)
+            .register(ManagedFieldsEntry.class)
+            .register(FieldsV1.class)
+            .register(LinkedHashMap.class)
+            .register(Collection.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, Pod> podMapListener = new KubevirtPodMapListener();
+
+    private ConsistentMap<String, Pod> podStore;
+
+    @Activate
+    protected void activate() {
+        ApplicationId appId = coreService.registerApplication(APP_ID);
+        podStore = storageService.<String, Pod>consistentMapBuilder()
+                .withSerializer(Serializer.using(SERIALIZER_K8S_POD))
+                .withName("kubevirt-pod-store")
+                .withApplicationId(appId)
+                .build();
+
+        podStore.addListener(podMapListener);
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        podStore.removeListener(podMapListener);
+        eventExecutor.shutdown();
+        log.info("Stopped");
+    }
+
+    @Override
+    public void createPod(Pod pod) {
+        podStore.compute(pod.getMetadata().getUid(), (uid, existing) -> {
+            final String error = pod.getMetadata().getUid() + ERR_DUPLICATE;
+            checkArgument(existing == null, error);
+            return pod;
+        });
+    }
+
+    @Override
+    public void updatePod(Pod pod) {
+        podStore.compute(pod.getMetadata().getUid(), (uid, existing) -> {
+            final String error = pod.getMetadata().getUid() + ERR_NOT_FOUND;
+            checkArgument(existing != null, error);
+            return pod;
+        });
+    }
+
+    @Override
+    public Pod removePod(String uid) {
+        Versioned<Pod> pod = podStore.remove(uid);
+        if (pod == null) {
+            final String error = uid + ERR_NOT_FOUND;
+            throw new IllegalArgumentException(error);
+        }
+        return pod.value();
+    }
+
+    @Override
+    public Pod pod(String uid) {
+        return podStore.asJavaMap().get(uid);
+    }
+
+    @Override
+    public Set<Pod> pods() {
+        return ImmutableSet.copyOf(podStore.asJavaMap().values());
+    }
+
+    @Override
+    public void clear() {
+        podStore.clear();
+    }
+
+    private class KubevirtPodMapListener implements MapEventListener<String, Pod> {
+
+        @Override
+        public void event(MapEvent<String, Pod> event) {
+
+            switch (event.type()) {
+                case INSERT:
+                    log.debug("Kubernetes pod created {}", event.newValue());
+                    eventExecutor.execute(() ->
+                            notifyDelegate(new KubevirtPodEvent(
+                                    KUBEVIRT_POD_CREATED, event.newValue().value())));
+                    break;
+                case UPDATE:
+                    log.debug("Kubernetes pod updated {}", event.newValue());
+                    eventExecutor.execute(() -> processUpdate(event));
+                    break;
+                case REMOVE:
+                    log.debug("Kubernetes pod removed {}", event.oldValue());
+                    eventExecutor.execute(() ->
+                            notifyDelegate(new KubevirtPodEvent(
+                                    KUBEVIRT_POD_REMOVED, event.oldValue().value())));
+                    break;
+                default:
+                    // do nothing
+                    break;
+            }
+        }
+
+        private void processUpdate(MapEvent<String, Pod> event) {
+            notifyDelegate(new KubevirtPodEvent(
+                    KUBEVIRT_POD_UPDATED, event.newValue().value()));
+
+            String oldPhase = event.oldValue().value().getStatus().getPhase();
+            String newPhase = event.newValue().value().getStatus().getPhase();
+
+            if (!PENDING.equals(oldPhase) && PENDING.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_PENDING, event.newValue().value()));
+            }
+
+            if (!RUNNING.equals(oldPhase) && RUNNING.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_RUNNING, event.newValue().value()));
+            }
+
+            if (!SUCCEEDED.equals(oldPhase) && SUCCEEDED.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_SUCCEEDED, event.newValue().value()));
+            }
+
+            if (!FAILED.equals(oldPhase) && FAILED.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_FAILED, event.newValue().value()));
+            }
+
+            if (!UNKNOWN.equals(oldPhase) && UNKNOWN.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_UNKNOWN, event.newValue().value()));
+            }
+
+            if (!COMPLETED.equals(oldPhase) && COMPLETED.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_COMPLETED, event.newValue().value()));
+            }
+
+            if (!CRASH_LOOP_BACK_OFF.equals(oldPhase) && CRASH_LOOP_BACK_OFF.equals(newPhase)) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_CRASH_LOOP_BACK_OFF, event.newValue().value()));
+            }
+
+            Map<String, String> oldAnnot = event.oldValue().value().getMetadata().getAnnotations();
+            Map<String, String> newAnnot = event.newValue().value().getMetadata().getAnnotations();
+
+            if (oldAnnot == null && newAnnot != null) {
+                notifyDelegate(new KubevirtPodEvent(
+                        KUBEVIRT_POD_ANNOTATION_ADDED, event.newValue().value()));
+            }
+        }
+    }
+}
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtPodManager.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtPodManager.java
new file mode 100644
index 0000000..3bb2241
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtPodManager.java
@@ -0,0 +1,162 @@
+/*
+ * 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.kubevirtnetworking.impl;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableSet;
+import io.fabric8.kubernetes.api.model.Pod;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.event.ListenerRegistry;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodAdminService;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodEvent;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodListener;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodService;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodStore;
+import org.onosproject.kubevirtnetworking.api.KubevirtPodStoreDelegate;
+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 static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.kubevirtnetworking.api.Constants.KUBEVIRT_NETWORKING_APP_ID;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Provides implementation of administering and interfacing kubernetes pod.
+ */
+@Component(
+        immediate = true,
+        service = {KubevirtPodAdminService.class, KubevirtPodService.class}
+)
+public class KubevirtPodManager
+        extends ListenerRegistry<KubevirtPodEvent, KubevirtPodListener>
+        implements KubevirtPodAdminService, KubevirtPodService {
+
+    protected final Logger log = getLogger(getClass());
+
+    private static final String MSG_POD  = "Kubernetes pod %s %s";
+    private static final String MSG_CREATED = "created";
+    private static final String MSG_UPDATED = "updated";
+    private static final String MSG_REMOVED = "removed";
+
+    private static final String ERR_NULL_POD  = "Kubevirt pod cannot be null";
+    private static final String ERR_NULL_POD_UID  = "Kubevirt pod UID cannot be null";
+
+    private static final String ERR_IN_USE = " still in use";
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    protected KubevirtPodStore kubevirtPodStore;
+
+    private final KubevirtPodStoreDelegate delegate = new InternalPodStorageDelegate();
+
+    private ApplicationId appId;
+
+    @Activate
+    protected void activate() {
+        appId = coreService.registerApplication(KUBEVIRT_NETWORKING_APP_ID);
+
+        kubevirtPodStore.setDelegate(delegate);
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        kubevirtPodStore.unsetDelegate(delegate);
+        log.info("Stopped");
+    }
+
+    @Override
+    public void createPod(Pod pod) {
+        checkNotNull(pod, ERR_NULL_POD);
+        checkArgument(!Strings.isNullOrEmpty(pod.getMetadata().getUid()),
+                ERR_NULL_POD_UID);
+
+        kubevirtPodStore.createPod(pod);
+
+        log.info(String.format(MSG_POD, pod.getMetadata().getName(), MSG_CREATED));
+    }
+
+    @Override
+    public void updatePod(Pod pod) {
+        checkNotNull(pod, ERR_NULL_POD);
+        checkArgument(!Strings.isNullOrEmpty(pod.getMetadata().getUid()),
+                ERR_NULL_POD_UID);
+
+        kubevirtPodStore.updatePod(pod);
+
+        log.info(String.format(MSG_POD, pod.getMetadata().getName(), MSG_UPDATED));
+    }
+
+    @Override
+    public void removePod(String uid) {
+        checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_POD_UID);
+
+        synchronized (this) {
+            if (isPodInUse(uid)) {
+                final String error = String.format(MSG_POD, uid, ERR_IN_USE);
+                throw new IllegalStateException(error);
+            }
+
+            Pod pod = kubevirtPodStore.removePod(uid);
+
+            if (pod != null) {
+                log.info(String.format(MSG_POD,
+                        pod.getMetadata().getName(), MSG_REMOVED));
+            }
+        }
+    }
+
+    @Override
+    public void clear() {
+        kubevirtPodStore.clear();
+    }
+
+    @Override
+    public Pod pod(String uid) {
+        checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_POD_UID);
+        return kubevirtPodStore.pod(uid);
+    }
+
+    @Override
+    public Set<Pod> pods() {
+        return ImmutableSet.copyOf(kubevirtPodStore.pods());
+    }
+
+    private boolean isPodInUse(String uid) {
+        return false;
+    }
+
+    private class InternalPodStorageDelegate implements KubevirtPodStoreDelegate {
+
+        @Override
+        public void notify(KubevirtPodEvent event) {
+            if (event != null) {
+                log.trace("send kubernetes pod event {}", event);
+                process(event);
+            }
+        }
+    }
+}
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtPodWatcher.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtPodWatcher.java
new file mode 100644
index 0000000..c792bef
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/KubevirtPodWatcher.java
@@ -0,0 +1,204 @@
+/*
+ * 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.kubevirtnetworking.impl;
+
+import io.fabric8.kubernetes.api.model.Pod;
+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.kubevirtnetworking.api.KubevirtPodAdminService;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfigEvent;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfigListener;
+import org.onosproject.kubevirtnode.api.KubevirtApiConfigService;
+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.kubevirtnetworking.api.Constants.KUBEVIRT_NETWORKING_APP_ID;
+import static org.onosproject.kubevirtnetworking.util.KubevirtNetworkingUtil.k8sClient;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Kubernetes pod watcher used for feeding pod information.
+ */
+@Component(immediate = true)
+public class KubevirtPodWatcher {
+
+    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 KubevirtPodAdminService kubevirtPodAdminService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    protected KubevirtApiConfigService kubevirtApiConfigService;
+
+    private final ExecutorService eventExecutor = newSingleThreadExecutor(
+            groupedThreads(this.getClass().getSimpleName(), "event-handler"));
+    private final Watcher<Pod> internalKubevirtPodWatcher = new InternalKubevirtPodWatcher();
+    private final InternalKubevirtApiConfigListener
+            internalKubevirtApiConfigListener = new InternalKubevirtApiConfigListener();
+
+    private ApplicationId appId;
+    private NodeId localNodeId;
+
+    @Activate
+    protected void activate() {
+        appId = coreService.registerApplication(KUBEVIRT_NETWORKING_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 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;
+            }
+
+            KubernetesClient client = k8sClient(kubevirtApiConfigService);
+
+            if (client != null) {
+                client.pods().inAnyNamespace().watch(internalKubevirtPodWatcher);
+            }
+        }
+    }
+
+    private class InternalKubevirtPodWatcher implements Watcher<Pod> {
+
+        @Override
+        public void eventReceived(Action action, Pod pod) {
+            switch (action) {
+                case ADDED:
+                    eventExecutor.execute(() -> processAddition(pod));
+                    break;
+                case MODIFIED:
+                    eventExecutor.execute(() -> processModification(pod));
+                    break;
+                case DELETED:
+                    eventExecutor.execute(() -> processDeletion(pod));
+                    break;
+                case ERROR:
+                    log.warn("Failures processing pod manipulation.");
+                    break;
+                default:
+                    break;
+            }
+        }
+
+        @Override
+        public void onClose(WatcherException e) {
+            log.warn("Pod watcher OnClose", e);
+        }
+
+        private void processAddition(Pod pod) {
+            if (!isMaster()) {
+                return;
+            }
+
+            log.trace("Process pod {} creating event from API server.",
+                    pod.getMetadata().getName());
+
+            if (kubevirtPodAdminService.pod(pod.getMetadata().getUid()) == null) {
+                kubevirtPodAdminService.createPod(pod);
+            }
+        }
+
+        private void processModification(Pod pod) {
+            if (!isMaster()) {
+                return;
+            }
+
+            log.trace("Process pod {} updating event from API server.",
+                    pod.getMetadata().getName());
+
+            if (kubevirtPodAdminService.pod(pod.getMetadata().getUid()) != null) {
+                kubevirtPodAdminService.updatePod(pod);
+            }
+        }
+
+        private void processDeletion(Pod pod) {
+            if (!isMaster()) {
+                return;
+            }
+
+            log.trace("Process pod {} removal event from API server.",
+                    pod.getMetadata().getName());
+
+            kubevirtPodAdminService.removePod(pod.getMetadata().getUid());
+        }
+
+        private boolean isMaster() {
+            return Objects.equals(localNodeId, leadershipService.getLeader(appId.name()));
+        }
+    }
+}