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| 1 | +/* |
| 2 | +Copyright 2020 The Kubernetes Authors. |
| 3 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +you may not use this file except in compliance with the License. |
| 5 | +You may obtain a copy of the License at |
| 6 | +http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | +Unless required by applicable law or agreed to in writing, software |
| 8 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 9 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 10 | +See the License for the specific language governing permissions and |
| 11 | +limitations under the License. |
| 12 | +*/ |
| 13 | +package io.kubernetes.client.examples; |
| 14 | + |
| 15 | +import io.kubernetes.client.extended.controller.Controller; |
| 16 | +import io.kubernetes.client.extended.controller.ControllerManager; |
| 17 | +import io.kubernetes.client.extended.controller.LeaderElectingController; |
| 18 | +import io.kubernetes.client.extended.controller.builder.ControllerBuilder; |
| 19 | +import io.kubernetes.client.extended.controller.reconciler.Reconciler; |
| 20 | +import io.kubernetes.client.extended.controller.reconciler.Request; |
| 21 | +import io.kubernetes.client.extended.controller.reconciler.Result; |
| 22 | +import io.kubernetes.client.extended.event.EventType; |
| 23 | +import io.kubernetes.client.extended.event.legacy.EventBroadcaster; |
| 24 | +import io.kubernetes.client.extended.event.legacy.EventRecorder; |
| 25 | +import io.kubernetes.client.extended.event.legacy.LegacyEventBroadcaster; |
| 26 | +import io.kubernetes.client.extended.leaderelection.LeaderElectionConfig; |
| 27 | +import io.kubernetes.client.extended.leaderelection.LeaderElector; |
| 28 | +import io.kubernetes.client.extended.leaderelection.resourcelock.EndpointsLock; |
| 29 | +import io.kubernetes.client.informer.SharedIndexInformer; |
| 30 | +import io.kubernetes.client.informer.SharedInformerFactory; |
| 31 | +import io.kubernetes.client.informer.cache.Lister; |
| 32 | +import io.kubernetes.client.openapi.ApiClient; |
| 33 | +import io.kubernetes.client.openapi.apis.CoreV1Api; |
| 34 | +import io.kubernetes.client.openapi.models.V1EventSource; |
| 35 | +import io.kubernetes.client.openapi.models.V1Node; |
| 36 | +import io.kubernetes.client.openapi.models.V1NodeList; |
| 37 | +import io.kubernetes.client.util.CallGeneratorParams; |
| 38 | +import java.io.IOException; |
| 39 | +import java.time.Duration; |
| 40 | +import java.util.concurrent.TimeUnit; |
| 41 | +import okhttp3.OkHttpClient; |
| 42 | + |
| 43 | +public class ControllerExample { |
| 44 | + public static void main(String[] args) throws IOException { |
| 45 | + |
| 46 | + CoreV1Api coreV1Api = new CoreV1Api(); |
| 47 | + ApiClient apiClient = coreV1Api.getApiClient(); |
| 48 | + OkHttpClient httpClient = |
| 49 | + apiClient.getHttpClient().newBuilder().readTimeout(0, TimeUnit.SECONDS).build(); |
| 50 | + apiClient.setHttpClient(httpClient); |
| 51 | + |
| 52 | + // instantiating an informer-factory, and there should be only one informer-factory |
| 53 | + // globally. |
| 54 | + SharedInformerFactory informerFactory = new SharedInformerFactory(); |
| 55 | + // registering node-informer into the informer-factory. |
| 56 | + SharedIndexInformer<V1Node> nodeInformer = |
| 57 | + informerFactory.sharedIndexInformerFor( |
| 58 | + (CallGeneratorParams params) -> { |
| 59 | + return coreV1Api.listNodeCall( |
| 60 | + null, |
| 61 | + null, |
| 62 | + null, |
| 63 | + null, |
| 64 | + null, |
| 65 | + null, |
| 66 | + params.resourceVersion, |
| 67 | + params.timeoutSeconds, |
| 68 | + params.watch, |
| 69 | + null); |
| 70 | + }, |
| 71 | + V1Node.class, |
| 72 | + V1NodeList.class); |
| 73 | + informerFactory.startAllRegisteredInformers(); |
| 74 | + |
| 75 | + EventBroadcaster eventBroadcaster = new LegacyEventBroadcaster(coreV1Api); |
| 76 | + |
| 77 | + // nodeReconciler prints node information on events |
| 78 | + NodePrintingReconciler nodeReconciler = |
| 79 | + new NodePrintingReconciler( |
| 80 | + nodeInformer, |
| 81 | + eventBroadcaster.newRecorder( |
| 82 | + new V1EventSource().host("localhost").component("node-printer"))); |
| 83 | + |
| 84 | + // Use builder library to construct a default controller. |
| 85 | + Controller controller = |
| 86 | + ControllerBuilder.defaultBuilder(informerFactory) |
| 87 | + .watch( |
| 88 | + (workQueue) -> |
| 89 | + ControllerBuilder.controllerWatchBuilder(V1Node.class, workQueue) |
| 90 | + .withWorkQueueKeyFunc( |
| 91 | + (V1Node node) -> |
| 92 | + new Request(node.getMetadata().getName())) // optional, default to |
| 93 | + .withOnAddFilter( |
| 94 | + (V1Node createdNode) -> |
| 95 | + createdNode |
| 96 | + .getMetadata() |
| 97 | + .getName() |
| 98 | + .startsWith("docker-")) // optional, set onAdd filter |
| 99 | + .withOnUpdateFilter( |
| 100 | + (V1Node oldNode, V1Node newNode) -> |
| 101 | + newNode |
| 102 | + .getMetadata() |
| 103 | + .getName() |
| 104 | + .startsWith("docker-")) // optional, set onUpdate filter |
| 105 | + .withOnDeleteFilter( |
| 106 | + (V1Node deletedNode, Boolean stateUnknown) -> |
| 107 | + deletedNode |
| 108 | + .getMetadata() |
| 109 | + .getName() |
| 110 | + .startsWith("docker-")) // optional, set onDelete filter |
| 111 | + .build()) |
| 112 | + .withReconciler(nodeReconciler) // required, set the actual reconciler |
| 113 | + .withName("node-printing-controller") // optional, set name for controller |
| 114 | + .withWorkerCount(4) // optional, set worker thread count |
| 115 | + .withReadyFunc(nodeInformer::hasSynced) // optional, only starts controller when the |
| 116 | + // cache has synced up |
| 117 | + .build(); |
| 118 | + |
| 119 | + // Use builder library to manage one or multiple controllers. |
| 120 | + ControllerManager controllerManager = |
| 121 | + ControllerBuilder.controllerManagerBuilder(informerFactory) |
| 122 | + .addController(controller) |
| 123 | + .build(); |
| 124 | + |
| 125 | + LeaderElectingController leaderElectingController = |
| 126 | + new LeaderElectingController( |
| 127 | + new LeaderElector( |
| 128 | + new LeaderElectionConfig( |
| 129 | + new EndpointsLock("kube-system", "leader-election", "foo"), |
| 130 | + Duration.ofMillis(10000), |
| 131 | + Duration.ofMillis(8000), |
| 132 | + Duration.ofMillis(5000))), |
| 133 | + controllerManager); |
| 134 | + |
| 135 | + leaderElectingController.run(); |
| 136 | + } |
| 137 | + |
| 138 | + static class NodePrintingReconciler implements Reconciler { |
| 139 | + |
| 140 | + private Lister<V1Node> nodeLister; |
| 141 | + private EventRecorder eventRecorder; |
| 142 | + |
| 143 | + public NodePrintingReconciler( |
| 144 | + SharedIndexInformer<V1Node> nodeInformer, EventRecorder recorder) { |
| 145 | + this.nodeLister = new Lister<>(nodeInformer.getIndexer()); |
| 146 | + this.eventRecorder = recorder; |
| 147 | + } |
| 148 | + |
| 149 | + @Override |
| 150 | + public Result reconcile(Request request) { |
| 151 | + V1Node node = this.nodeLister.get(request.getName()); |
| 152 | + System.out.println("triggered reconciling " + node.getMetadata().getName()); |
| 153 | + this.eventRecorder.event( |
| 154 | + node, |
| 155 | + EventType.Normal, |
| 156 | + "Print Node", |
| 157 | + "Successfully printed %s", |
| 158 | + node.getMetadata().getName()); |
| 159 | + return new Result(false); |
| 160 | + } |
| 161 | + } |
| 162 | +} |
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