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   1 /**
   2  * Copyright (c) 2010-2020 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.keba.internal.handler;
  14
  15 import java.io.IOException;
  16 import java.io.UnsupportedEncodingException;
  17 import java.net.InetSocketAddress;
  18 import java.net.PortUnreachableException;
  19 import java.nio.ByteBuffer;
  20 import java.nio.channels.CancelledKeyException;
  21 import java.nio.channels.ClosedChannelException;
  22 import java.nio.channels.ClosedSelectorException;
  23 import java.nio.channels.DatagramChannel;
  24 import java.nio.channels.NotYetConnectedException;
  25 import java.nio.channels.SelectionKey;
  26 import java.nio.channels.Selector;
  27 import java.util.Collections;
  28 import java.util.HashMap;
  29 import java.util.HashSet;
  30 import java.util.Iterator;
  31 import java.util.Map;
  32 import java.util.Set;
  33 import java.util.concurrent.locks.ReentrantLock;
  34
  35 import org.openhab.core.thing.ThingStatus;
  36 import org.openhab.core.thing.ThingStatusDetail;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 /**
  41  * The {@link KeContactTransceiver} is responsible for receiving UDP broadcast messages sent by the KEBA Charging
  42  * Stations. {@link KeContactHandler} willing to receive these messages have to register themselves with the
  43  * {@link KeContactTransceiver}
  44  *
  45  * @author Karel Goderis - Initial contribution
  46  */
  47
  48 class KeContactTransceiver {
  49
  50     public static final int LISTENER_PORT_NUMBER = 7090;
  51     public static final int REMOTE_PORT_NUMBER = 7090;
  52     public static final int LISTENING_INTERVAL = 100;
  53     public static final int BUFFER_SIZE = 1024;
  54     public static final String IP_ADDRESS = "ipAddress";
  55     public static final String POLLING_REFRESH_INTERVAL = "refreshInterval";
  56
  57     private DatagramChannel broadcastChannel;
  58     private SelectionKey broadcastKey;
  59     private Selector selector;
  60     private Thread transceiverThread;
  61     private boolean isStarted = false;
  62     private Set<KeContactHandler> handlers = Collections.synchronizedSet(new HashSet<>());
  63     private Map<KeContactHandler, DatagramChannel> datagramChannels = Collections.synchronizedMap(new HashMap<>());
  64     private Map<KeContactHandler, ByteBuffer> buffers = Collections.synchronizedMap(new HashMap<>());
  65     private Map<KeContactHandler, ReentrantLock> locks = Collections.synchronizedMap(new HashMap<>());
  66     private Map<KeContactHandler, Boolean> flags = Collections.synchronizedMap(new HashMap<>());
  67
  68     private final Logger logger = LoggerFactory.getLogger(KeContactTransceiver.class);
  69
  70     public void start() {
  71         if (!isStarted) {
  72             logger.debug("Starting the the KEBA KeContact transceiver");
  73             try {
  74                 selector = Selector.open();
  75
  76                 if (transceiverThread == null) {
  77                     transceiverThread = new Thread(transceiverRunnable, "openHAB-Keba-Transceiver");
  78                     transceiverThread.start();
  79                 }
  80
  81                 broadcastChannel = DatagramChannel.open();
  82                 broadcastChannel.socket().bind(new InetSocketAddress(LISTENER_PORT_NUMBER));
  83                 broadcastChannel.configureBlocking(false);
  84
  85                 logger.info("Listening for incoming data on {}", broadcastChannel.getLocalAddress());
  86
  87                 synchronized (selector) {
  88                     selector.wakeup();
  89                     broadcastKey = broadcastChannel.register(selector, broadcastChannel.validOps());
  90                 }
  91
  92                 for (KeContactHandler listener : handlers) {
  93                     establishConnection(listener);
  94                 }
  95
  96                 isStarted = true;
  97             } catch (ClosedSelectorException | CancelledKeyException | IOException e) {
  98                 logger.error("An exception occurred while registering the selector: {}", e.getMessage());
  99             }
 100         }
 101     }
 102
 103     public void stop() {
 104         if (isStarted) {
 105             for (KeContactHandler listener : handlers) {
 106                 this.removeConnection(listener);
 107             }
 108
 109             try {
 110                 broadcastChannel.close();
 111             } catch (IOException e) {
 112                 logger.error("An exception occurred while closing the broadcast channel on port number {} : '{}'",
 113                         LISTENER_PORT_NUMBER, e.getMessage(), e);
 114             }
 115
 116             try {
 117                 selector.close();
 118             } catch (IOException e) {
 119                 logger.error("An exception occurred while closing the selector: '{}'", e.getMessage(), e);
 120             }
 121
 122             logger.debug("Stopping the the KEBA KeContact transceiver");
 123             if (transceiverThread != null) {
 124                 transceiverThread.interrupt();
 125                 try {
 126                     transceiverThread.join();
 127                 } catch (InterruptedException e) {
 128                     Thread.currentThread().interrupt();
 129                 }
 130                 transceiverThread = null;
 131             }
 132
 133             locks.clear();
 134             flags.clear();
 135
 136             isStarted = false;
 137         }
 138     }
 139
 140     private void reset() {
 141         stop();
 142         isStarted = false;
 143         start();
 144     }
 145
 146     public void registerHandler(KeContactHandler handler) {
 147         if (handler != null) {
 148             handlers.add(handler);
 149             locks.put(handler, new ReentrantLock());
 150
 151             if (logger.isTraceEnabled()) {
 152                 logger.trace("There are now {} KEBA KeContact handlers registered with the transceiver",
 153                         handlers.size());
 154             }
 155
 156             if (handlers.size() == 1) {
 157                 start();
 158             }
 159
 160             if (!isConnected(handler)) {
 161                 establishConnection(handler);
 162             }
 163         }
 164     }
 165
 166     public void unRegisterHandler(KeContactHandler handler) {
 167         if (handler != null) {
 168             locks.remove(handler);
 169             handlers.remove(handler);
 170
 171             if (logger.isTraceEnabled()) {
 172                 logger.trace("There are now {} KEBA KeContact handlers registered with the transceiver",
 173                         handlers.size());
 174             }
 175
 176             if (handlers.isEmpty()) {
 177                 stop();
 178             }
 179         }
 180     }
 181
 182     protected ByteBuffer send(String message, KeContactHandler handler) {
 183         ReentrantLock handlerLock = locks.get(handler);
 184
 185         if (handlerLock != null) {
 186             handlerLock.lock();
 187             try {
 188                 ByteBuffer buffer = ByteBuffer.allocate(message.getBytes().length);
 189                 buffer.put(message.getBytes("ASCII"));
 190
 191                 flags.put(handler, Boolean.TRUE);
 192                 buffers.put(handler, buffer);
 193
 194                 synchronized (handlerLock) {
 195                     if (logger.isTraceEnabled()) {
 196                         logger.trace("{} waiting on handerLock {}", Thread.currentThread().getName(),
 197                                 handlerLock.toString());
 198                     }
 199                     handlerLock.wait(KeContactHandler.REPORT_INTERVAL);
 200                 }
 201
 202                 return buffers.remove(handler);
 203             } catch (UnsupportedEncodingException | InterruptedException e) {
 204                 Thread.currentThread().interrupt();
 205                 handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, e.getMessage());
 206             } finally {
 207                 handlerLock.unlock();
 208             }
 209         } else {
 210             if (logger.isDebugEnabled()) {
 211                 logger.debug("The handler for '{}' is not yet registered with the KeContactTransceiver",
 212                         handler.getThing().getUID());
 213             }
 214         }
 215         return null;
 216     }
 217
 218     public Runnable transceiverRunnable = () -> {
 219         while (true) {
 220             try {
 221                 synchronized (selector) {
 222                     try {
 223                         selector.selectNow();
 224                     } catch (IOException e) {
 225                         logger.error("An exception occurred while selecting: {}", e.getMessage());
 226                     }
 227
 228                     Iterator<SelectionKey> it = selector.selectedKeys().iterator();
 229                     while (it.hasNext()) {
 230                         SelectionKey selKey = it.next();
 231                         it.remove();
 232
 233                         if (selKey.isValid() && selKey.isWritable()) {
 234                             DatagramChannel theChannel = (DatagramChannel) selKey.channel();
 235                             KeContactHandler theHandler = null;
 236                             boolean error = false;
 237
 238                             for (KeContactHandler handler : handlers) {
 239                                 if (theChannel.equals(datagramChannels.get(handler))) {
 240                                     theHandler = handler;
 241                                     break;
 242                                 }
 243                             }
 244
 245                             if (theHandler != null) {
 246                                 ReentrantLock theLock = locks.get(theHandler);
 247                                 Boolean theFlag = flags.get(theHandler);
 248                                 if (theLock != null && theLock.isLocked() && theFlag != null
 249                                         && theFlag.equals(Boolean.TRUE)) {
 250                                     ByteBuffer theBuffer = buffers.remove(theHandler);
 251                                     flags.put(theHandler, Boolean.FALSE);
 252
 253                                     if (theBuffer != null) {
 254                                         try {
 255                                             theBuffer.rewind();
 256                                             logger.debug("Sending '{}' on the channel '{}'->'{}'",
 257                                                     new Object[] { new String(theBuffer.array()),
 258                                                             theChannel.getLocalAddress(),
 259                                                             theChannel.getRemoteAddress() });
 260                                             int byteswritten = theChannel.write(theBuffer);
 261                                         } catch (NotYetConnectedException e) {
 262                                             theHandler.updateStatus(ThingStatus.OFFLINE,
 263                                                     ThingStatusDetail.COMMUNICATION_ERROR,
 264                                                     "The remote host is not yet connected");
 265                                             error = true;
 266                                         } catch (ClosedChannelException e) {
 267                                             theHandler.updateStatus(ThingStatus.OFFLINE,
 268                                                     ThingStatusDetail.COMMUNICATION_ERROR,
 269                                                     "The connection to the remote host is closed");
 270                                             error = true;
 271                                         } catch (IOException e) {
 272                                             theHandler.updateStatus(ThingStatus.OFFLINE,
 273                                                     ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred");
 274                                             error = true;
 275                                         }
 276
 277                                         if (error) {
 278                                             removeConnection(theHandler);
 279                                             establishConnection(theHandler);
 280                                         }
 281                                     }
 282                                 }
 283                             }
 284                         }
 285
 286                         if (selKey.isValid() && selKey.isReadable()) {
 287                             int numberBytesRead = 0;
 288                             InetSocketAddress clientAddress = null;
 289                             ByteBuffer readBuffer = null;
 290                             boolean error = false;
 291
 292                             if (selKey.equals(broadcastKey)) {
 293                                 try {
 294                                     readBuffer = ByteBuffer.allocate(BUFFER_SIZE);
 295                                     clientAddress = (InetSocketAddress) broadcastChannel.receive(readBuffer);
 296                                     logger.debug("Received {} from {} on the transceiver listener port ",
 297                                             new String(readBuffer.array()), clientAddress);
 298                                     numberBytesRead = readBuffer.position();
 299                                 } catch (IOException e) {
 300                                     logger.error(
 301                                             "An exception occurred while receiving data on the transceiver listener port: '{}'",
 302                                             e.getMessage(), e);
 303                                     error = true;
 304                                 }
 305
 306                                 if (numberBytesRead == -1) {
 307                                     error = true;
 308                                 }
 309
 310                                 if (!error) {
 311                                     readBuffer.flip();
 312                                     if (readBuffer.remaining() > 0) {
 313                                         for (KeContactHandler handler : handlers) {
 314                                             if (clientAddress != null && handler.getIPAddress()
 315                                                     .equals(clientAddress.getAddress().getHostAddress())) {
 316                                                 ReentrantLock theLock = locks.get(handler);
 317                                                 if (theLock != null && theLock.isLocked()) {
 318                                                     buffers.put(handler, readBuffer);
 319                                                     synchronized (theLock) {
 320                                                         if (logger.isTraceEnabled()) {
 321                                                             logger.trace("{} notifyall on handerLock {}",
 322                                                                     Thread.currentThread().getName(),
 323                                                                     theLock.toString());
 324                                                         }
 325                                                         theLock.notifyAll();
 326                                                     }
 327                                                 } else {
 328                                                     handler.onData(readBuffer);
 329                                                 }
 330                                             }
 331                                         }
 332                                     }
 333                                 } else {
 334                                     handlers.forEach(listener -> listener.updateStatus(ThingStatus.OFFLINE,
 335                                             ThingStatusDetail.COMMUNICATION_ERROR, "The transceiver is offline"));
 336                                     reset();
 337                                 }
 338                             } else {
 339                                 DatagramChannel theChannel = (DatagramChannel) selKey.channel();
 340                                 KeContactHandler theHandler = null;
 341
 342                                 for (KeContactHandler handlers : handlers) {
 343                                     if (datagramChannels.get(handlers).equals(theChannel)) {
 344                                         theHandler = handlers;
 345                                         break;
 346                                     }
 347                                 }
 348
 349                                 if (theHandler != null) {
 350                                     try {
 351                                         readBuffer = ByteBuffer.allocate(BUFFER_SIZE);
 352                                         numberBytesRead = theChannel.read(readBuffer);
 353                                         logger.debug("Received {} from {} on the transceiver listener port ",
 354                                                 new String(readBuffer.array()), theChannel.getRemoteAddress());
 355                                     } catch (NotYetConnectedException e) {
 356                                         theHandler.updateStatus(ThingStatus.OFFLINE,
 357                                                 ThingStatusDetail.COMMUNICATION_ERROR,
 358                                                 "The remote host is not yet connected");
 359                                         error = true;
 360                                     } catch (PortUnreachableException e) {
 361                                         theHandler.updateStatus(ThingStatus.OFFLINE,
 362                                                 ThingStatusDetail.CONFIGURATION_ERROR,
 363                                                 "The remote host is probably not a KEBA KeContact");
 364                                         error = true;
 365                                     } catch (IOException e) {
 366                                         theHandler.updateStatus(ThingStatus.OFFLINE,
 367                                                 ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred");
 368                                         error = true;
 369                                     }
 370
 371                                     if (numberBytesRead == -1) {
 372                                         error = true;
 373                                     }
 374
 375                                     if (!error) {
 376                                         readBuffer.flip();
 377                                         if (readBuffer.remaining() > 0) {
 378                                             ReentrantLock theLock = locks.get(theHandler);
 379                                             if (theLock != null && theLock.isLocked()) {
 380                                                 buffers.put(theHandler, readBuffer);
 381                                                 synchronized (theLock) {
 382                                                     theLock.notifyAll();
 383                                                 }
 384                                             }
 385                                         }
 386                                     } else {
 387                                         removeConnection(theHandler);
 388                                         establishConnection(theHandler);
 389                                     }
 390                                 }
 391                             }
 392                         }
 393                     }
 394                 }
 395
 396                 if (!Thread.currentThread().isInterrupted()) {
 397                     Thread.sleep(LISTENING_INTERVAL);
 398                 } else {
 399                     return;
 400                 }
 401             } catch (InterruptedException | ClosedSelectorException e) {
 402                 Thread.currentThread().interrupt();
 403                 return;
 404             }
 405         }
 406     };
 407
 408     private void establishConnection(KeContactHandler handler) {
 409         if (handler.getThing().getStatusInfo().getStatusDetail() != ThingStatusDetail.CONFIGURATION_ERROR
 410                 && handler.getConfig().get(IP_ADDRESS) != null && !handler.getConfig().get(IP_ADDRESS).equals("")) {
 411             logger.debug("Establishing the connection to the KEBA KeContact '{}'", handler.getThing().getUID());
 412
 413             DatagramChannel datagramChannel = null;
 414             try {
 415                 datagramChannel = DatagramChannel.open();
 416             } catch (Exception e2) {
 417                 handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 418                         "An exception occurred while opening a datagram channel");
 419             }
 420
 421             if (datagramChannel != null) {
 422                 datagramChannels.put(handler, datagramChannel);
 423
 424                 try {
 425                     datagramChannel.configureBlocking(false);
 426                 } catch (IOException e2) {
 427                     handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 428                             "An exception occurred while configuring a datagram channel");
 429                 }
 430
 431                 synchronized (selector) {
 432                     selector.wakeup();
 433                     int interestSet = SelectionKey.OP_READ | SelectionKey.OP_WRITE;
 434                     try {
 435                         datagramChannel.register(selector, interestSet);
 436                     } catch (ClosedChannelException e1) {
 437                         handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 438                                 "An exception occurred while registering a selector");
 439                     }
 440
 441                     InetSocketAddress remoteAddress = new InetSocketAddress(
 442                             (String) handler.getConfig().get(IP_ADDRESS), REMOTE_PORT_NUMBER);
 443
 444                     try {
 445                         if (logger.isTraceEnabled()) {
 446                             logger.trace("Connecting the channel for {} ", remoteAddress);
 447                         }
 448                         datagramChannel.connect(remoteAddress);
 449
 450                         handler.updateStatus(ThingStatus.ONLINE, ThingStatusDetail.NONE, "");
 451                     } catch (Exception e) {
 452                         logger.debug("An exception occurred while connecting connecting to '{}:{}' : {}", new Object[] {
 453                                 (String) handler.getConfig().get(IP_ADDRESS), REMOTE_PORT_NUMBER, e.getMessage() });
 454                         handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 455                                 "An exception occurred while connecting");
 456                     }
 457                 }
 458             }
 459         } else {
 460             handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 461                     handler.getThing().getStatusInfo().getDescription());
 462         }
 463     }
 464
 465     private void removeConnection(KeContactHandler handler) {
 466         logger.debug("Tearing down the connection to the KEBA KeContact '{}'", handler.getThing().getUID());
 467         DatagramChannel datagramChannel = datagramChannels.remove(handler);
 468
 469         if (datagramChannel != null) {
 470             synchronized (selector) {
 471                 try {
 472                     datagramChannel.keyFor(selector).cancel();
 473                     datagramChannel.close();
 474                     handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.NONE, "");
 475                 } catch (Exception e) {
 476                     logger.debug("An exception occurred while closing the datagramchannel for '{}': {}",
 477                             handler.getThing().getUID(), e.getMessage());
 478                     handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 479                             "An exception occurred while closing the datagramchannel");
 480                 }
 481             }
 482         }
 483     }
 484
 485     private boolean isConnected(KeContactHandler handler) {
 486         return datagramChannels.get(handler) != null ? true : false;
 487     }
 488 }