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/*
* 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.dubbo.registry.kubernetes;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.rpc.cluster.router.mesh.route.MeshAppRuleListener;
import org.apache.dubbo.rpc.cluster.router.mesh.route.MeshEnvListener;
import io.fabric8.kubernetes.api.model.GenericKubernetesResource;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.Watch;
import io.fabric8.kubernetes.client.Watcher;
import io.fabric8.kubernetes.client.WatcherException;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.SafeConstructor;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_ERROR_LISTEN_KUBERNETES;
public class KubernetesMeshEnvListener implements MeshEnvListener {
public static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(KubernetesMeshEnvListener.class);
private static volatile boolean usingApiServer = false;
private static volatile KubernetesClient kubernetesClient;
private static volatile String namespace;
private final Map appRuleListenerMap = new ConcurrentHashMap<>();
private final Map vsAppWatch = new ConcurrentHashMap<>();
private final Map drAppWatch = new ConcurrentHashMap<>();
private final Map vsAppCache = new ConcurrentHashMap<>();
private final Map drAppCache = new ConcurrentHashMap<>();
public static void injectKubernetesEnv(KubernetesClient client, String configuredNamespace) {
usingApiServer = true;
kubernetesClient = client;
namespace = configuredNamespace;
}
@Override
public boolean isEnable() {
return usingApiServer;
}
@Override
public void onSubscribe(String appName, MeshAppRuleListener listener) {
appRuleListenerMap.put(appName, listener);
logger.info("Subscribe Mesh Rule in Kubernetes. AppName: " + appName);
// subscribe VisualService
subscribeVs(appName);
// subscribe DestinationRule
subscribeDr(appName);
// notify for start
notifyOnce(appName);
}
private void subscribeVs(String appName) {
if (vsAppWatch.containsKey(appName)) {
return;
}
try {
Watch watch = kubernetesClient
.genericKubernetesResources(
MeshConstant.getVsDefinition())
.inNamespace(namespace)
.withName(appName)
.watch(new Watcher() {
@Override
public void eventReceived(Action action, GenericKubernetesResource resource) {
if (logger.isInfoEnabled()) {
logger.info("Received VS Rule notification. AppName: " + appName + " Action:" + action + " Resource:" + resource);
}
if (action == Action.ADDED || action == Action.MODIFIED) {
String vsRule = new Yaml(new SafeConstructor()).dump(resource);
vsAppCache.put(appName, vsRule);
if (drAppCache.containsKey(appName)) {
notifyListener(vsRule, appName, drAppCache.get(appName));
}
} else {
appRuleListenerMap.get(appName).receiveConfigInfo("");
}
}
@Override
public void onClose(WatcherException cause) {
// ignore
}
});
vsAppWatch.put(appName, watch);
try {
GenericKubernetesResource vsRule = kubernetesClient
.genericKubernetesResources(
MeshConstant.getVsDefinition())
.inNamespace(namespace)
.withName(appName)
.get();
vsAppCache.put(appName, new Yaml(new SafeConstructor()).dump(vsRule));
} catch (Throwable ignore) {
}
} catch (Exception e) {
logger.error(REGISTRY_ERROR_LISTEN_KUBERNETES, "", "", "Error occurred when listen kubernetes crd.", e);
}
}
private void notifyListener(String vsRule, String appName, String drRule) {
String rule = vsRule + "\n---\n" + drRule;
logger.info("Notify App Rule Listener. AppName: " + appName + " Rule:" + rule);
appRuleListenerMap.get(appName).receiveConfigInfo(rule);
}
private void subscribeDr(String appName) {
if (drAppWatch.containsKey(appName)) {
return;
}
try {
Watch watch = kubernetesClient
.genericKubernetesResources(
MeshConstant.getDrDefinition())
.inNamespace(namespace)
.withName(appName)
.watch(new Watcher() {
@Override
public void eventReceived(Action action, GenericKubernetesResource resource) {
if (logger.isInfoEnabled()) {
logger.info("Received VS Rule notification. AppName: " + appName + " Action:" + action + " Resource:" + resource);
}
if (action == Action.ADDED || action == Action.MODIFIED) {
String drRule = new Yaml(new SafeConstructor()).dump(resource);
drAppCache.put(appName, drRule);
if (vsAppCache.containsKey(appName)) {
notifyListener(vsAppCache.get(appName), appName, drRule);
}
} else {
appRuleListenerMap.get(appName).receiveConfigInfo("");
}
}
@Override
public void onClose(WatcherException cause) {
// ignore
}
});
drAppWatch.put(appName, watch);
try {
GenericKubernetesResource drRule = kubernetesClient
.genericKubernetesResources(
MeshConstant.getDrDefinition())
.inNamespace(namespace)
.withName(appName)
.get();
drAppCache.put(appName, new Yaml(new SafeConstructor()).dump(drRule));
} catch (Throwable ignore) {
}
} catch (Exception e) {
logger.error(REGISTRY_ERROR_LISTEN_KUBERNETES, "", "", "Error occurred when listen kubernetes crd.", e);
}
}
private void notifyOnce(String appName) {
if (vsAppCache.containsKey(appName) && drAppCache.containsKey(appName)) {
notifyListener(vsAppCache.get(appName), appName, drAppCache.get(appName));
}
}
@Override
public void onUnSubscribe(String appName) {
appRuleListenerMap.remove(appName);
if (vsAppWatch.containsKey(appName)) {
vsAppWatch.remove(appName).close();
}
vsAppCache.remove(appName);
if (drAppWatch.containsKey(appName)) {
drAppWatch.remove(appName).close();
}
drAppCache.remove(appName);
}
}