| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * Licensed 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.onosproject.ui.impl; |
| |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Sets; |
| import org.eclipse.jetty.websocket.WebSocket; |
| import org.eclipse.jetty.websocket.WebSocketServlet; |
| import org.onlab.osgi.DefaultServiceDirectory; |
| import org.onlab.osgi.ServiceDirectory; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import java.security.Principal; |
| import java.util.Set; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| |
| /** |
| * Web socket servlet capable of creating web sockets for the user interface. |
| */ |
| public class UiWebSocketServlet extends WebSocketServlet { |
| |
| private static final long PING_DELAY_MS = 5000; |
| |
| private static UiWebSocketServlet instance; |
| private static final Object INSTANCE_LOCK = new Object(); |
| |
| private static ServiceDirectory directory = new DefaultServiceDirectory(); |
| |
| private final Set<UiWebSocket> sockets = Sets.newConcurrentHashSet(); |
| private final Timer timer = new Timer(); |
| private final TimerTask pruner = new Pruner(); |
| private static boolean isStopped = false; |
| |
| /** |
| * Closes all currently open UI web-sockets. |
| */ |
| public static void closeAll() { |
| synchronized (INSTANCE_LOCK) { |
| if (instance != null) { |
| isStopped = true; |
| instance.sockets.forEach(UiWebSocket::close); |
| instance.sockets.clear(); |
| instance.pruner.cancel(); |
| instance.timer.cancel(); |
| } |
| } |
| } |
| |
| @Override |
| public void init() throws ServletException { |
| super.init(); |
| synchronized (INSTANCE_LOCK) { |
| instance = this; |
| } |
| timer.schedule(pruner, PING_DELAY_MS, PING_DELAY_MS); |
| } |
| |
| @Override |
| public WebSocket doWebSocketConnect(HttpServletRequest request, String protocol) { |
| if (isStopped) { |
| return null; |
| } |
| |
| // FIXME: Replace this with globally shared opaque token to allow secure failover |
| Principal p = request.getUserPrincipal(); |
| String userName = p != null ? p.getName() : FAKE_USERNAME; |
| |
| UiWebSocket socket = new UiWebSocket(directory, userName); |
| sockets.add(socket); |
| return socket; |
| } |
| |
| // FIXME: This should not be necessary |
| private static final String FAKE_USERNAME = "UI-user"; |
| |
| /** |
| * Sends the specified message to all the GUI clients. |
| * |
| * @param type message type |
| * @param payload message payload |
| */ |
| static void sendToAll(String type, ObjectNode payload) { |
| synchronized (INSTANCE_LOCK) { |
| if (instance != null) { |
| instance.sockets.forEach(ws -> ws.sendMessage(type, payload)); |
| } |
| } |
| } |
| |
| /** |
| * Sends the specified message to all the GUI clients of the specified user. |
| * |
| * @param userName user name |
| * @param type message type |
| * @param payload message payload |
| */ |
| static void sendToUser(String userName, String type, ObjectNode payload) { |
| synchronized (INSTANCE_LOCK) { |
| if (instance != null) { |
| instance.sockets.stream().filter(ws -> userName.equals(ws.userName())) |
| .forEach(ws -> ws.sendMessage(type, payload)); |
| } |
| } |
| } |
| |
| // Task for pruning web-sockets that are idle. |
| private class Pruner extends TimerTask { |
| @Override |
| public void run() { |
| ImmutableSet<UiWebSocket> set = ImmutableSet.copyOf(sockets); |
| set.stream().filter(UiWebSocket::isIdle).forEach(s -> { |
| sockets.remove(s); |
| s.close(); |
| }); |
| } |
| } |
| } |