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   1 /**
   2  * Copyright (c) 2010-2023 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 public class KeContactTransceiver {
  49
  50     public static final int LISTENER_PORT_NUMBER = 7090;
  51     public static final int LISTENING_INTERVAL = 100;
  52     public static final int BUFFER_SIZE = 1024;
  53
  54     private DatagramChannel broadcastChannel;
  55     private SelectionKey broadcastKey;
  56     private Selector selector;
  57     private Thread transceiverThread;
  58     private boolean isStarted = false;
  59     private Set<KeContactHandler> handlers = Collections.synchronizedSet(new HashSet<>());
  60     private Map<KeContactHandler, DatagramChannel> datagramChannels = Collections.synchronizedMap(new HashMap<>());
  61     private Map<KeContactHandler, ByteBuffer> buffers = Collections.synchronizedMap(new HashMap<>());
  62     private Map<KeContactHandler, ReentrantLock> locks = Collections.synchronizedMap(new HashMap<>());
  63     private Map<KeContactHandler, Boolean> flags = Collections.synchronizedMap(new HashMap<>());
  64
  65     private final Logger logger = LoggerFactory.getLogger(KeContactTransceiver.class);
  66
  67     public void start() {
  68         if (!isStarted) {
  69             logger.debug("Starting the the KEBA KeContact transceiver");
  70             try {
  71                 selector = Selector.open();
  72
  73                 if (transceiverThread == null) {
  74                     transceiverThread = new Thread(transceiverRunnable, "OH-binding-Keba-Transceiver");
  75                     transceiverThread.start();
  76                 }
  77
  78                 broadcastChannel = DatagramChannel.open();
  79                 broadcastChannel.socket().bind(new InetSocketAddress(LISTENER_PORT_NUMBER));
  80                 broadcastChannel.configureBlocking(false);
  81
  82                 logger.info("Listening for incoming data on {}", broadcastChannel.getLocalAddress());
  83
  84                 synchronized (selector) {
  85                     selector.wakeup();
  86                     broadcastKey = broadcastChannel.register(selector, broadcastChannel.validOps());
  87                 }
  88
  89                 for (KeContactHandler listener : handlers) {
  90                     establishConnection(listener);
  91                 }
  92
  93                 isStarted = true;
  94             } catch (ClosedSelectorException | CancelledKeyException | IOException e) {
  95                 logger.error("An exception occurred while registering the selector: {}", e.getMessage());
  96             }
  97         }
  98     }
  99
 100     public void stop() {
 101         if (isStarted) {
 102             for (KeContactHandler listener : handlers) {
 103                 this.removeConnection(listener);
 104             }
 105
 106             try {
 107                 broadcastChannel.close();
 108             } catch (IOException e) {
 109                 logger.error("An exception occurred while closing the broadcast channel on port number {} : '{}'",
 110                         LISTENER_PORT_NUMBER, e.getMessage(), e);
 111             }
 112
 113             try {
 114                 selector.close();
 115             } catch (IOException e) {
 116                 logger.error("An exception occurred while closing the selector: '{}'", e.getMessage(), e);
 117             }
 118
 119             logger.debug("Stopping the the KEBA KeContact transceiver");
 120             if (transceiverThread != null) {
 121                 transceiverThread.interrupt();
 122                 try {
 123                     transceiverThread.join();
 124                 } catch (InterruptedException e) {
 125                     Thread.currentThread().interrupt();
 126                 }
 127                 transceiverThread = null;
 128             }
 129
 130             locks.clear();
 131             flags.clear();
 132
 133             isStarted = false;
 134         }
 135     }
 136
 137     private void reset() {
 138         stop();
 139         isStarted = false;
 140         start();
 141     }
 142
 143     public void registerHandler(KeContactHandler handler) {
 144         if (handler != null) {
 145             handlers.add(handler);
 146             locks.put(handler, new ReentrantLock());
 147
 148             if (logger.isTraceEnabled()) {
 149                 logger.trace("There are now {} KEBA KeContact handlers registered with the transceiver",
 150                         handlers.size());
 151             }
 152
 153             if (handlers.size() == 1) {
 154                 start();
 155             }
 156
 157             if (!isConnected(handler)) {
 158                 establishConnection(handler);
 159             }
 160         }
 161     }
 162
 163     public void unRegisterHandler(KeContactHandler handler) {
 164         if (handler != null) {
 165             locks.remove(handler);
 166             handlers.remove(handler);
 167
 168             if (logger.isTraceEnabled()) {
 169                 logger.trace("There are now {} KEBA KeContact handlers registered with the transceiver",
 170                         handlers.size());
 171             }
 172
 173             if (handlers.isEmpty()) {
 174                 stop();
 175             }
 176         }
 177     }
 178
 179     protected ByteBuffer send(String message, KeContactHandler handler) {
 180         ReentrantLock handlerLock = locks.get(handler);
 181
 182         if (handlerLock != null) {
 183             handlerLock.lock();
 184             try {
 185                 ByteBuffer buffer = ByteBuffer.allocate(message.getBytes().length);
 186                 buffer.put(message.getBytes("ASCII"));
 187
 188                 flags.put(handler, Boolean.TRUE);
 189                 buffers.put(handler, buffer);
 190
 191                 synchronized (handlerLock) {
 192                     if (logger.isTraceEnabled()) {
 193                         logger.trace("{} waiting on handerLock {}", Thread.currentThread().getName(),
 194                                 handlerLock.toString());
 195                     }
 196                     handlerLock.wait(KeContactHandler.REPORT_INTERVAL);
 197                 }
 198
 199                 return buffers.remove(handler);
 200             } catch (UnsupportedEncodingException | InterruptedException e) {
 201                 Thread.currentThread().interrupt();
 202                 handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, e.getMessage());
 203             } finally {
 204                 handlerLock.unlock();
 205             }
 206         } else {
 207             if (logger.isDebugEnabled()) {
 208                 logger.debug("The handler for '{}' is not yet registered with the KeContactTransceiver",
 209                         handler.getThing().getUID());
 210             }
 211         }
 212         return null;
 213     }
 214
 215     public Runnable transceiverRunnable = () -> {
 216         while (true) {
 217             try {
 218                 synchronized (selector) {
 219                     try {
 220                         selector.selectNow();
 221                     } catch (IOException e) {
 222                         logger.error("An exception occurred while selecting: {}", e.getMessage());
 223                     }
 224
 225                     Iterator<SelectionKey> it = selector.selectedKeys().iterator();
 226                     while (it.hasNext()) {
 227                         SelectionKey selKey = it.next();
 228                         it.remove();
 229
 230                         if (selKey.isValid() && selKey.isWritable()) {
 231                             DatagramChannel theChannel = (DatagramChannel) selKey.channel();
 232                             KeContactHandler theHandler = null;
 233                             boolean error = false;
 234
 235                             for (KeContactHandler handler : handlers) {
 236                                 if (theChannel.equals(datagramChannels.get(handler))) {
 237                                     theHandler = handler;
 238                                     break;
 239                                 }
 240                             }
 241
 242                             if (theHandler != null) {
 243                                 ReentrantLock theLock = locks.get(theHandler);
 244                                 Boolean theFlag = flags.get(theHandler);
 245                                 if (theLock != null && theLock.isLocked() && theFlag != null
 246                                         && theFlag.equals(Boolean.TRUE)) {
 247                                     ByteBuffer theBuffer = buffers.remove(theHandler);
 248                                     flags.put(theHandler, Boolean.FALSE);
 249
 250                                     if (theBuffer != null) {
 251                                         try {
 252                                             theBuffer.rewind();
 253                                             logger.debug("Sending '{}' on the channel '{}'->'{}'",
 254                                                     new Object[] { new String(theBuffer.array()),
 255                                                             theChannel.getLocalAddress(),
 256                                                             theChannel.getRemoteAddress() });
 257                                             theChannel.write(theBuffer);
 258                                         } catch (NotYetConnectedException e) {
 259                                             theHandler.updateStatus(ThingStatus.OFFLINE,
 260                                                     ThingStatusDetail.COMMUNICATION_ERROR,
 261                                                     "The remote host is not yet connected");
 262                                             error = true;
 263                                         } catch (ClosedChannelException e) {
 264                                             theHandler.updateStatus(ThingStatus.OFFLINE,
 265                                                     ThingStatusDetail.COMMUNICATION_ERROR,
 266                                                     "The connection to the remote host is closed");
 267                                             error = true;
 268                                         } catch (IOException e) {
 269                                             theHandler.updateStatus(ThingStatus.OFFLINE,
 270                                                     ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred");
 271                                             error = true;
 272                                         }
 273
 274                                         if (error) {
 275                                             removeConnection(theHandler);
 276                                             establishConnection(theHandler);
 277                                         }
 278                                     }
 279                                 }
 280                             }
 281                         }
 282
 283                         if (selKey.isValid() && selKey.isReadable()) {
 284                             int numberBytesRead = 0;
 285                             InetSocketAddress clientAddress = null;
 286                             ByteBuffer readBuffer = null;
 287                             boolean error = false;
 288
 289                             if (selKey.equals(broadcastKey)) {
 290                                 try {
 291                                     readBuffer = ByteBuffer.allocate(BUFFER_SIZE);
 292                                     clientAddress = (InetSocketAddress) broadcastChannel.receive(readBuffer);
 293                                     logger.debug("Received {} from {} on the transceiver listener port ",
 294                                             new String(readBuffer.array()), clientAddress);
 295                                     numberBytesRead = readBuffer.position();
 296                                 } catch (IOException e) {
 297                                     logger.error(
 298                                             "An exception occurred while receiving data on the transceiver listener port: '{}'",
 299                                             e.getMessage(), e);
 300                                     error = true;
 301                                 }
 302
 303                                 if (numberBytesRead == -1) {
 304                                     error = true;
 305                                 }
 306
 307                                 if (!error) {
 308                                     readBuffer.flip();
 309                                     if (readBuffer.remaining() > 0) {
 310                                         for (KeContactHandler handler : handlers) {
 311                                             if (clientAddress != null && handler.getIPAddress()
 312                                                     .equals(clientAddress.getAddress().getHostAddress())) {
 313                                                 ReentrantLock theLock = locks.get(handler);
 314                                                 if (theLock != null && theLock.isLocked()) {
 315                                                     buffers.put(handler, readBuffer);
 316                                                     synchronized (theLock) {
 317                                                         if (logger.isTraceEnabled()) {
 318                                                             logger.trace("{} notifyall on handerLock {}",
 319                                                                     Thread.currentThread().getName(),
 320                                                                     theLock.toString());
 321                                                         }
 322                                                         theLock.notifyAll();
 323                                                     }
 324                                                 } else {
 325                                                     handler.onData(readBuffer);
 326                                                 }
 327                                             }
 328                                         }
 329                                     }
 330                                 } else {
 331                                     handlers.forEach(listener -> listener.updateStatus(ThingStatus.OFFLINE,
 332                                             ThingStatusDetail.COMMUNICATION_ERROR, "The transceiver is offline"));
 333                                     reset();
 334                                 }
 335                             } else {
 336                                 DatagramChannel theChannel = (DatagramChannel) selKey.channel();
 337                                 KeContactHandler theHandler = null;
 338
 339                                 for (KeContactHandler handlers : handlers) {
 340                                     if (datagramChannels.get(handlers).equals(theChannel)) {
 341                                         theHandler = handlers;
 342                                         break;
 343                                     }
 344                                 }
 345
 346                                 if (theHandler != null) {
 347                                     try {
 348                                         readBuffer = ByteBuffer.allocate(BUFFER_SIZE);
 349                                         numberBytesRead = theChannel.read(readBuffer);
 350                                         logger.debug("Received {} from {} on the transceiver listener port ",
 351                                                 new String(readBuffer.array()), theChannel.getRemoteAddress());
 352                                     } catch (NotYetConnectedException e) {
 353                                         theHandler.updateStatus(ThingStatus.OFFLINE,
 354                                                 ThingStatusDetail.COMMUNICATION_ERROR,
 355                                                 "The remote host is not yet connected");
 356                                         error = true;
 357                                     } catch (PortUnreachableException e) {
 358                                         theHandler.updateStatus(ThingStatus.OFFLINE,
 359                                                 ThingStatusDetail.CONFIGURATION_ERROR,
 360                                                 "The remote host is probably not a KEBA KeContact");
 361                                         error = true;
 362                                     } catch (IOException e) {
 363                                         theHandler.updateStatus(ThingStatus.OFFLINE,
 364                                                 ThingStatusDetail.COMMUNICATION_ERROR, "An IO exception occurred");
 365                                         error = true;
 366                                     }
 367
 368                                     if (numberBytesRead == -1) {
 369                                         error = true;
 370                                     }
 371
 372                                     if (!error) {
 373                                         readBuffer.flip();
 374                                         if (readBuffer.remaining() > 0) {
 375                                             ReentrantLock theLock = locks.get(theHandler);
 376                                             if (theLock != null && theLock.isLocked()) {
 377                                                 buffers.put(theHandler, readBuffer);
 378                                                 synchronized (theLock) {
 379                                                     theLock.notifyAll();
 380                                                 }
 381                                             }
 382                                         }
 383                                     } else {
 384                                         removeConnection(theHandler);
 385                                         establishConnection(theHandler);
 386                                     }
 387                                 }
 388                             }
 389                         }
 390                     }
 391                 }
 392
 393                 if (!Thread.currentThread().isInterrupted()) {
 394                     Thread.sleep(LISTENING_INTERVAL);
 395                 } else {
 396                     return;
 397                 }
 398             } catch (InterruptedException | ClosedSelectorException e) {
 399                 Thread.currentThread().interrupt();
 400                 return;
 401             }
 402         }
 403     };
 404
 405     private void establishConnection(KeContactHandler handler) {
 406         String ipAddress = handler.getIPAddress();
 407         if (handler.getThing().getStatusInfo().getStatusDetail() != ThingStatusDetail.CONFIGURATION_ERROR
 408                 && !"".equals(ipAddress)) {
 409             logger.debug("Establishing the connection to the KEBA KeContact '{}'", handler.getThing().getUID());
 410
 411             DatagramChannel datagramChannel = null;
 412             try {
 413                 datagramChannel = DatagramChannel.open();
 414             } catch (Exception e2) {
 415                 handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 416                         "An exception occurred while opening a datagram channel");
 417             }
 418
 419             if (datagramChannel != null) {
 420                 datagramChannels.put(handler, datagramChannel);
 421
 422                 try {
 423                     datagramChannel.configureBlocking(false);
 424                 } catch (IOException e2) {
 425                     handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 426                             "An exception occurred while configuring a datagram channel");
 427                 }
 428
 429                 synchronized (selector) {
 430                     selector.wakeup();
 431                     int interestSet = SelectionKey.OP_READ | SelectionKey.OP_WRITE;
 432                     try {
 433                         datagramChannel.register(selector, interestSet);
 434                     } catch (ClosedChannelException e1) {
 435                         handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 436                                 "An exception occurred while registering a selector");
 437                     }
 438
 439                     InetSocketAddress remoteAddress = new InetSocketAddress(ipAddress, LISTENER_PORT_NUMBER);
 440
 441                     try {
 442                         if (logger.isTraceEnabled()) {
 443                             logger.trace("Connecting the channel for {} ", remoteAddress);
 444                         }
 445                         datagramChannel.connect(remoteAddress);
 446
 447                         handler.updateStatus(ThingStatus.ONLINE, ThingStatusDetail.NONE, "");
 448                     } catch (Exception e) {
 449                         logger.debug("An exception occurred while connecting connecting to '{}:{}' : {}",
 450                                 new Object[] { ipAddress, LISTENER_PORT_NUMBER, e.getMessage() });
 451                         handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 452                                 "An exception occurred while connecting");
 453                     }
 454                 }
 455             }
 456         } else {
 457             handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 458                     handler.getThing().getStatusInfo().getDescription());
 459         }
 460     }
 461
 462     private void removeConnection(KeContactHandler handler) {
 463         logger.debug("Tearing down the connection to the KEBA KeContact '{}'", handler.getThing().getUID());
 464         DatagramChannel datagramChannel = datagramChannels.remove(handler);
 465
 466         if (datagramChannel != null) {
 467             synchronized (selector) {
 468                 try {
 469                     datagramChannel.keyFor(selector).cancel();
 470                     datagramChannel.close();
 471                     handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.NONE, "");
 472                 } catch (Exception e) {
 473                     logger.debug("An exception occurred while closing the datagramchannel for '{}': {}",
 474                             handler.getThing().getUID(), e.getMessage());
 475                     handler.updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
 476                             "An exception occurred while closing the datagramchannel");
 477                 }
 478             }
 479         }
 480     }
 481
 482     private boolean isConnected(KeContactHandler handler) {
 483         return datagramChannels.get(handler) != null ? true : false;
 484     }
 485 }