| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * 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.onlab.stc; |
| |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| import org.eclipse.jetty.websocket.WebSocket; |
| |
| import java.io.IOException; |
| |
| import static org.onlab.stc.Coordinator.print; |
| |
| /** |
| * Web socket capable of interacting with the STC monitor GUI. |
| */ |
| public class MonitorWebSocket implements WebSocket.OnTextMessage, WebSocket.OnControl { |
| |
| private static final long MAX_AGE_MS = 30_000; |
| |
| private static final byte PING = 0x9; |
| private static final byte PONG = 0xA; |
| private static final byte[] PING_DATA = new byte[]{(byte) 0xde, (byte) 0xad}; |
| |
| private final Monitor monitor; |
| |
| private Connection connection; |
| private FrameConnection control; |
| |
| private final ObjectMapper mapper = new ObjectMapper(); |
| |
| private long lastActive = System.currentTimeMillis(); |
| |
| /** |
| * Creates a new monitor client GUI web-socket. |
| * |
| * @param monitor shared process flow monitor |
| */ |
| MonitorWebSocket(Monitor monitor) { |
| this.monitor = monitor; |
| } |
| |
| /** |
| * Issues a close on the connection. |
| */ |
| synchronized void close() { |
| destroyHandlers(); |
| if (connection.isOpen()) { |
| connection.close(); |
| } |
| } |
| |
| /** |
| * Indicates if this connection is idle. |
| * |
| * @return true if idle or closed |
| */ |
| synchronized boolean isIdle() { |
| long quietFor = System.currentTimeMillis() - lastActive; |
| boolean idle = quietFor > MAX_AGE_MS; |
| if (idle || (connection != null && !connection.isOpen())) { |
| return true; |
| } else if (connection != null) { |
| try { |
| control.sendControl(PING, PING_DATA, 0, PING_DATA.length); |
| } catch (IOException e) { |
| print("Unable to send ping message due to: %s", e); |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void onOpen(Connection connection) { |
| this.connection = connection; |
| this.control = (FrameConnection) connection; |
| try { |
| createHandlers(); |
| sendMessage(message("flow", monitor.scenarioData())); |
| |
| } catch (Exception e) { |
| print("Unable to open monitor connection: %s", e); |
| this.connection.close(); |
| this.connection = null; |
| this.control = null; |
| } |
| } |
| |
| @Override |
| public synchronized void onClose(int closeCode, String message) { |
| destroyHandlers(); |
| } |
| |
| @Override |
| public boolean onControl(byte controlCode, byte[] data, int offset, int length) { |
| lastActive = System.currentTimeMillis(); |
| return true; |
| } |
| |
| @Override |
| public void onMessage(String data) { |
| lastActive = System.currentTimeMillis(); |
| try { |
| ObjectNode message = (ObjectNode) mapper.reader().readTree(data); |
| // TODO: |
| print("Got message: %s", message); |
| } catch (Exception e) { |
| print("Unable to parse GUI message %s due to %s", data, e); |
| } |
| } |
| |
| public synchronized void sendMessage(ObjectNode message) { |
| try { |
| if (connection.isOpen()) { |
| connection.sendMessage(message.toString()); |
| } |
| } catch (IOException e) { |
| print("Unable to send message %s to GUI due to %s", message, e); |
| } |
| } |
| |
| public ObjectNode message(String type, ObjectNode payload) { |
| ObjectNode message = mapper.createObjectNode().put("event", type); |
| message.set("payload", payload); |
| return message; |
| } |
| |
| // Creates new message handlers. |
| private synchronized void createHandlers() { |
| } |
| |
| // Destroys message handlers. |
| private synchronized void destroyHandlers() { |
| } |
| |
| } |
| |