| /* |
| * 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.servicecomb.service.center.client; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.servicecomb.http.client.auth.RequestAuthHeaderProvider; |
| import org.apache.servicecomb.http.client.common.HttpConfiguration.SSLProperties; |
| import org.apache.servicecomb.http.client.common.WebSocketListener; |
| import org.apache.servicecomb.http.client.common.WebSocketTransport; |
| import org.apache.servicecomb.service.center.client.DiscoveryEvents.PullInstanceEvent; |
| import org.java_websocket.handshake.ServerHandshake; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.eventbus.EventBus; |
| |
| public class ServiceCenterWatch implements WebSocketListener { |
| private static final Logger LOGGER = LoggerFactory.getLogger(ServiceCenterWatch.class); |
| |
| private static final String HTTP = "http://"; |
| |
| private static final String HTTPS = "https://"; |
| |
| private static final String WS = "ws://"; |
| |
| private static final String WSS = "wss://"; |
| |
| private static final String WATCH = "/v4/%s/registry/microservices/%s/watcher"; |
| |
| private static final long SLEEP_BASE = 3000; |
| |
| private static final long SLEEP_MAX = 10 * 60 * 10000; |
| |
| private final AddressManager addressManager; |
| |
| private final SSLProperties sslProperties; |
| |
| private final RequestAuthHeaderProvider requestAuthHeaderProvider; |
| |
| private final String tenantName; |
| |
| private final Map<String, String> extraGlobalHeaders; |
| |
| private WebSocketTransport webSocketTransport; |
| |
| private String project; |
| |
| private String serviceId; |
| |
| private int continuousError = 0; |
| |
| private final AtomicBoolean reconnecting = new AtomicBoolean(false); |
| |
| private final EventBus eventBus; |
| |
| private String currentServerUri; |
| |
| private final ExecutorService connector = Executors.newFixedThreadPool(1, (r) -> new |
| Thread(r, "web-socket-connector")); |
| |
| public ServiceCenterWatch(AddressManager addressManager, |
| SSLProperties sslProperties, |
| RequestAuthHeaderProvider requestAuthHeaderProvider, |
| String tenantName, |
| Map<String, String> extraGlobalHeaders, |
| EventBus eventBus) { |
| this.addressManager = addressManager; |
| this.sslProperties = sslProperties; |
| this.requestAuthHeaderProvider = requestAuthHeaderProvider; |
| this.tenantName = tenantName; |
| this.extraGlobalHeaders = extraGlobalHeaders; |
| this.eventBus = eventBus; |
| } |
| |
| public void startWatch(String project, String serviceId) { |
| this.project = project; |
| this.serviceId = serviceId; |
| |
| startWatch(); |
| } |
| |
| private void startWatch() { |
| connector.submit(() -> { |
| backOff(); |
| String address = addressManager.address(); |
| try { |
| Map<String, String> headers = new HashMap<>(); |
| headers.put("x-domain-name", this.tenantName); |
| headers.putAll(this.extraGlobalHeaders); |
| headers.putAll(this.requestAuthHeaderProvider.loadAuthHeader(null)); |
| currentServerUri = convertAddress(address); |
| LOGGER.info("start watch to address {}", currentServerUri); |
| webSocketTransport = new WebSocketTransport(currentServerUri, sslProperties, |
| headers, this); |
| webSocketTransport.connectBlocking(); |
| addressManager.recordSuccessState(address); |
| } catch (Exception e) { |
| addressManager.recordFailState(address); |
| LOGGER.error("start watch failed. ", e); |
| } |
| }); |
| } |
| |
| private String convertAddress(String address) { |
| String url = String.format(WATCH, project, serviceId); |
| if (address.startsWith(HTTP)) { |
| return WS + address.substring(HTTP.length()) + url; |
| } |
| |
| if (address.startsWith(HTTPS)) { |
| return WSS + address.substring(HTTPS.length()) + url; |
| } |
| return address + url; |
| } |
| |
| public void stop() { |
| if (webSocketTransport != null) { |
| webSocketTransport.close(); |
| } |
| } |
| |
| private void reconnect() { |
| if (reconnecting.getAndSet(true)) { |
| return; |
| } |
| continuousError++; |
| if (webSocketTransport != null) { |
| webSocketTransport.close(); |
| } |
| startWatch(); |
| } |
| |
| private void backOff() { |
| if (this.continuousError <= 0) { |
| return; |
| } |
| try { |
| Thread.sleep(Math.min(SLEEP_MAX, this.continuousError * this.continuousError * SLEEP_BASE)); |
| } catch (InterruptedException e) { |
| // do not care |
| } |
| } |
| |
| @Override |
| public void onMessage(String s) { |
| LOGGER.info("web socket receive message [{}], start query instance", s); |
| this.eventBus.post(new PullInstanceEvent()); |
| } |
| |
| @Override |
| public void onError(Exception e) { |
| LOGGER.warn("web socket receive error [{}], will restart.", e.getMessage()); |
| reconnect(); |
| } |
| |
| @Override |
| public void onClose(int code, String reason, boolean remote) { |
| LOGGER.warn("web socket closed, code={}, reason={}.", code, reason); |
| } |
| |
| @Override |
| public void onOpen(ServerHandshake serverHandshake) { |
| LOGGER.info("web socket connected to server {}, status={}, message={}", currentServerUri, |
| serverHandshake.getHttpStatus(), |
| serverHandshake.getHttpStatusMessage()); |
| continuousError = 0; |
| reconnecting.set(false); |
| } |
| } |