| /* |
| * 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.xds.util; |
| |
| import org.apache.dubbo.common.URL; |
| import org.apache.dubbo.common.logger.ErrorTypeAwareLogger; |
| import org.apache.dubbo.common.logger.LoggerFactory; |
| import org.apache.dubbo.common.threadpool.manager.FrameworkExecutorRepository; |
| import org.apache.dubbo.registry.xds.util.protocol.AbstractProtocol; |
| import org.apache.dubbo.registry.xds.util.protocol.DeltaResource; |
| import org.apache.dubbo.rpc.model.ApplicationModel; |
| |
| import io.envoyproxy.envoy.config.core.v3.Node; |
| import io.envoyproxy.envoy.service.discovery.v3.DiscoveryRequest; |
| import io.envoyproxy.envoy.service.discovery.v3.DiscoveryResponse; |
| import io.grpc.stub.StreamObserver; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_ERROR_REQUEST_XDS; |
| |
| public class AdsObserver { |
| private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(AdsObserver.class); |
| private final ApplicationModel applicationModel; |
| private final URL url; |
| private final Node node; |
| private volatile XdsChannel xdsChannel; |
| |
| private final Map<String, XdsListener> listeners = new ConcurrentHashMap<>(); |
| |
| protected StreamObserver<DiscoveryRequest> requestObserver; |
| |
| private final Map<String, DiscoveryRequest> observedResources = new ConcurrentHashMap<>(); |
| |
| public AdsObserver(URL url, Node node) { |
| this.url = url; |
| this.node = node; |
| this.xdsChannel = new XdsChannel(url); |
| this.applicationModel = url.getOrDefaultApplicationModel(); |
| } |
| |
| public <T, S extends DeltaResource<T>> void addListener(AbstractProtocol<T, S> protocol) { |
| listeners.put(protocol.getTypeUrl(), protocol); |
| } |
| |
| public void request(DiscoveryRequest discoveryRequest) { |
| if (requestObserver == null) { |
| requestObserver = xdsChannel.createDeltaDiscoveryRequest(new ResponseObserver(this)); |
| } |
| requestObserver.onNext(discoveryRequest); |
| observedResources.put(discoveryRequest.getTypeUrl(), discoveryRequest); |
| } |
| |
| private static class ResponseObserver implements StreamObserver<DiscoveryResponse> { |
| private AdsObserver adsObserver; |
| |
| public ResponseObserver(AdsObserver adsObserver) { |
| this.adsObserver = adsObserver; |
| } |
| |
| @Override |
| public void onNext(DiscoveryResponse discoveryResponse) { |
| XdsListener xdsListener = adsObserver.listeners.get(discoveryResponse.getTypeUrl()); |
| xdsListener.process(discoveryResponse); |
| adsObserver.requestObserver.onNext(buildAck(discoveryResponse)); |
| } |
| |
| protected DiscoveryRequest buildAck(DiscoveryResponse response) { |
| // for ACK |
| return DiscoveryRequest.newBuilder() |
| .setNode(adsObserver.node) |
| .setTypeUrl(response.getTypeUrl()) |
| .setVersionInfo(response.getVersionInfo()) |
| .setResponseNonce(response.getNonce()) |
| .addAllResourceNames(adsObserver |
| .observedResources |
| .get(response.getTypeUrl()) |
| .getResourceNamesList()) |
| .build(); |
| } |
| |
| @Override |
| public void onError(Throwable throwable) { |
| logger.error(REGISTRY_ERROR_REQUEST_XDS, "", "", "xDS Client received error message! detail:", throwable); |
| adsObserver.triggerReConnectTask(); |
| } |
| |
| @Override |
| public void onCompleted() { |
| logger.info("xDS Client completed"); |
| adsObserver.triggerReConnectTask(); |
| } |
| } |
| |
| private void triggerReConnectTask() { |
| ScheduledExecutorService scheduledFuture = applicationModel |
| .getFrameworkModel() |
| .getBeanFactory() |
| .getBean(FrameworkExecutorRepository.class) |
| .getSharedScheduledExecutor(); |
| scheduledFuture.schedule(this::recover, 3, TimeUnit.SECONDS); |
| } |
| |
| private void recover() { |
| try { |
| xdsChannel = new XdsChannel(url); |
| if (xdsChannel.getChannel() != null) { |
| requestObserver = xdsChannel.createDeltaDiscoveryRequest(new ResponseObserver(this)); |
| observedResources.values().forEach(requestObserver::onNext); |
| return; |
| } else { |
| logger.error( |
| REGISTRY_ERROR_REQUEST_XDS, |
| "", |
| "", |
| "Recover failed for xDS connection. Will retry. Create channel failed."); |
| } |
| } catch (Exception e) { |
| logger.error(REGISTRY_ERROR_REQUEST_XDS, "", "", "Recover failed for xDS connection. Will retry.", e); |
| } |
| triggerReConnectTask(); |
| } |
| } |