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   1 /**
   2  * Copyright (c) 2010-2021 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.denonmarantz.internal.connector.telnet;
  14
  15 import java.io.BufferedReader;
  16 import java.io.IOException;
  17 import java.io.InputStreamReader;
  18 import java.io.OutputStreamWriter;
  19 import java.net.InetSocketAddress;
  20 import java.net.Socket;
  21 import java.net.SocketTimeoutException;
  22
  23 import org.apache.commons.lang.StringUtils;
  24 import org.openhab.binding.denonmarantz.internal.config.DenonMarantzConfiguration;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 /**
  29  * Manage telnet connection to the Denon/Marantz Receiver
  30  *
  31  * @author Jeroen Idserda - Initial contribution (1.x Binding)
  32  * @author Jan-Willem Veldhuis - Refactored for 2.x
  33  */
  34 public class DenonMarantzTelnetClientThread extends Thread {
  35
  36     private Logger logger = LoggerFactory.getLogger(DenonMarantzTelnetClientThread.class);
  37
  38     private static final Integer RECONNECT_DELAY = 60000; // 1 minute
  39
  40     private static final Integer TIMEOUT = 60000; // 1 minute
  41
  42     private DenonMarantzConfiguration config;
  43
  44     private DenonMarantzTelnetListener listener;
  45
  46     private boolean connected = false;
  47
  48     private Socket socket;
  49
  50     private OutputStreamWriter out;
  51
  52     private BufferedReader in;
  53
  54     public DenonMarantzTelnetClientThread(DenonMarantzConfiguration config, DenonMarantzTelnetListener listener) {
  55         logger.debug("Denon listener created");
  56         this.config = config;
  57         this.listener = listener;
  58     }
  59
  60     @Override
  61     public void run() {
  62         while (!isInterrupted()) {
  63             if (!connected) {
  64                 connectTelnetSocket();
  65             }
  66
  67             do {
  68                 try {
  69                     String line = in.readLine();
  70                     if (line == null) {
  71                         logger.debug("No more data read from client. Disconnecting..");
  72                         listener.telnetClientConnected(false);
  73                         disconnect();
  74                         break;
  75                     }
  76                     logger.trace("Received from {}: {}", config.getHost(), line);
  77                     if (!StringUtils.isBlank(line)) {
  78                         listener.receivedLine(line);
  79                     }
  80                 } catch (SocketTimeoutException e) {
  81                     logger.trace("Socket timeout");
  82                     // Disconnects are not always detected unless you write to the socket.
  83                     try {
  84                         out.write('\r');
  85                         out.flush();
  86                     } catch (IOException e2) {
  87                         logger.debug("Error writing to socket");
  88                         connected = false;
  89                     }
  90                 } catch (IOException e) {
  91                     if (!isInterrupted()) {
  92                         // only log if we don't stop this on purpose causing a SocketClosed
  93                         logger.debug("Error in telnet connection ", e);
  94                     }
  95                     connected = false;
  96                     listener.telnetClientConnected(false);
  97                 }
  98             } while (!isInterrupted() && connected);
  99         }
 100         disconnect();
 101         logger.debug("Stopped client thread");
 102     }
 103
 104     public void sendCommand(String command) {
 105         if (out != null) {
 106             try {
 107                 out.write(command + '\r');
 108                 out.flush();
 109             } catch (IOException e) {
 110                 logger.debug("Error sending command", e);
 111             }
 112         } else {
 113             logger.debug("Cannot send command, no telnet connection");
 114         }
 115     }
 116
 117     public void shutdown() {
 118         disconnect();
 119     }
 120
 121     private void connectTelnetSocket() {
 122         disconnect();
 123         int delay = 0;
 124
 125         while (!isInterrupted() && (socket == null || !socket.isConnected())) {
 126             try {
 127                 Thread.sleep(delay);
 128                 logger.debug("Connecting to {}", config.getHost());
 129
 130                 // Use raw socket instead of TelnetClient here because TelnetClient sends an
 131                 // extra newline char after each write which causes the connection to become
 132                 // unresponsive.
 133                 socket = new Socket();
 134                 socket.connect(new InetSocketAddress(config.getHost(), config.getTelnetPort()), TIMEOUT);
 135                 socket.setKeepAlive(true);
 136                 socket.setSoTimeout(TIMEOUT);
 137
 138                 in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
 139                 out = new OutputStreamWriter(socket.getOutputStream(), "UTF-8");
 140
 141                 connected = true;
 142                 listener.telnetClientConnected(true);
 143                 logger.debug("Denon telnet client connected to {}", config.getHost());
 144             } catch (IOException e) {
 145                 logger.debug("Cannot connect to {}", config.getHost(), e);
 146                 listener.telnetClientConnected(false);
 147             } catch (InterruptedException e) {
 148                 logger.debug("Interrupted while connecting to {}", config.getHost(), e);
 149             }
 150             delay = RECONNECT_DELAY;
 151         }
 152     }
 153
 154     public boolean isConnected() {
 155         return connected;
 156     }
 157
 158     private void disconnect() {
 159         if (socket != null) {
 160             logger.debug("Disconnecting socket");
 161             try {
 162                 socket.close();
 163             } catch (IOException e) {
 164                 logger.debug("Error while disconnecting telnet client", e);
 165             } finally {
 166                 socket = null;
 167                 out = null;
 168                 in = null;
 169                 listener.telnetClientConnected(false);
 170             }
 171         }
 172     }
 173 }