| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.skywalking.library.kubernetes; |
| |
| import static java.util.Objects.requireNonNull; |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| import io.kubernetes.client.informer.ResourceEventHandler; |
| import io.kubernetes.client.informer.SharedInformerFactory; |
| import io.kubernetes.client.openapi.apis.CoreV1Api; |
| import io.kubernetes.client.openapi.models.V1Endpoints; |
| import io.kubernetes.client.openapi.models.V1EndpointsList; |
| |
| public enum KubernetesEndpointWatcher implements ResourceEventHandler<V1Endpoints> { |
| INSTANCE; |
| |
| private final ExecutorService executor = Executors.newCachedThreadPool( |
| new ThreadFactoryBuilder() |
| .setNameFormat("KubernetesEndpointWatcher-%d") |
| .setDaemon(true) |
| .build() |
| ); |
| private final AtomicBoolean started = new AtomicBoolean(); |
| private final Set<KubernetesEndpointsListener> listeners = Collections.newSetFromMap(new ConcurrentHashMap<>()); |
| |
| public void start() throws IOException { |
| if (!started.compareAndSet(false, true)) { |
| return; |
| } |
| |
| KubernetesClient.setDefault(); |
| |
| final CoreV1Api coreV1Api = new CoreV1Api(); |
| final SharedInformerFactory factory = new SharedInformerFactory(executor); |
| |
| listenEndpointEvents(coreV1Api, factory); |
| |
| factory.startAllRegisteredInformers(); |
| } |
| |
| public KubernetesEndpointWatcher addListener(KubernetesEndpointsListener listener) { |
| requireNonNull(listener, "listener"); |
| |
| listeners.add(listener); |
| |
| return this; |
| } |
| |
| @Override |
| public void onAdd(V1Endpoints endpoints) { |
| listeners.forEach(it -> it.onEndpointsAdded(endpoints)); |
| } |
| |
| @Override |
| public void onUpdate(V1Endpoints oldEndpoints, V1Endpoints newEndpoints) { |
| listeners.forEach(it -> it.onEndpointsUpdated(oldEndpoints, newEndpoints)); |
| } |
| |
| @Override |
| public void onDelete(V1Endpoints endpoints, boolean deletedFinalStateUnknown) { |
| listeners.forEach(it -> it.onEndpointsDeleted(endpoints)); |
| } |
| |
| private void listenEndpointEvents(final CoreV1Api coreV1Api, |
| final SharedInformerFactory factory) { |
| factory.sharedIndexInformerFor( |
| params -> coreV1Api.listEndpointsForAllNamespacesCall( |
| null, |
| null, |
| null, |
| null, |
| null, |
| null, |
| params.resourceVersion, |
| null, |
| params.timeoutSeconds, |
| params.watch, |
| null |
| ), |
| V1Endpoints.class, |
| V1EndpointsList.class |
| ).addEventHandler(this); |
| } |
| } |