src/main/java/net/pterodactylus/irc/Connection.java

   1 /*
   2  * XdccDownloader - Connection.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.irc;
  19
  20 import static com.google.common.base.Preconditions.checkState;
  21
  22 import java.io.BufferedReader;
  23 import java.io.Closeable;
  24 import java.io.EOFException;
  25 import java.io.IOException;
  26 import java.io.InputStream;
  27 import java.io.InputStreamReader;
  28 import java.io.OutputStream;
  29 import java.io.UnsupportedEncodingException;
  30 import java.net.InetAddress;
  31 import java.net.Socket;
  32 import java.net.UnknownHostException;
  33 import java.util.ArrayList;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Set;
  37 import java.util.logging.Level;
  38 import java.util.logging.Logger;
  39 import javax.net.SocketFactory;
  40
  41 import net.pterodactylus.irc.event.ChannelJoined;
  42 import net.pterodactylus.irc.event.ChannelLeft;
  43 import net.pterodactylus.irc.event.ChannelMessageReceived;
  44 import net.pterodactylus.irc.event.ChannelNicknames;
  45 import net.pterodactylus.irc.event.ChannelNotJoined;
  46 import net.pterodactylus.irc.event.ChannelNotJoined.Reason;
  47 import net.pterodactylus.irc.event.ChannelTopic;
  48 import net.pterodactylus.irc.event.ClientQuit;
  49 import net.pterodactylus.irc.event.ConnectionClosed;
  50 import net.pterodactylus.irc.event.ConnectionEstablished;
  51 import net.pterodactylus.irc.event.ConnectionFailed;
  52 import net.pterodactylus.irc.event.DccAcceptReceived;
  53 import net.pterodactylus.irc.event.DccSendReceived;
  54 import net.pterodactylus.irc.event.MotdReceived;
  55 import net.pterodactylus.irc.event.NicknameChanged;
  56 import net.pterodactylus.irc.event.NicknameInUseReceived;
  57 import net.pterodactylus.irc.event.NoNicknameGivenReceived;
  58 import net.pterodactylus.irc.event.PrivateMessageReceived;
  59 import net.pterodactylus.irc.event.UnknownReplyReceived;
  60 import net.pterodactylus.irc.util.RandomNickname;
  61
  62 import com.google.common.base.Optional;
  63 import com.google.common.collect.Maps;
  64 import com.google.common.collect.Sets;
  65 import com.google.common.eventbus.EventBus;
  66 import com.google.common.io.Closeables;
  67 import com.google.common.primitives.Ints;
  68 import com.google.common.primitives.Longs;
  69 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  70 import com.google.common.util.concurrent.Service;
  71
  72 /**
  73  * A connection to an IRC server.
  74  *
  75  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  76  */
  77 public class Connection extends AbstractExecutionThreadService implements Service {
  78
  79         /* The logger. */
  80         private static final Logger logger = Logger.getLogger(Connection.class.getName());
  81
  82         /** The event bus. */
  83         private final EventBus eventBus;
  84
  85         /** The socket factory. */
  86         private final SocketFactory socketFactory;
  87
  88         /** The hostname to connect to. */
  89         private final String hostname;
  90
  91         /** The port to connect to. */
  92         private final int port;
  93
  94         /** The nickname chooser. */
  95         private NicknameChooser nicknameChooser = new NicknameChooser() {
  96
  97                 @Override
  98                 public String getNickname() {
  99                         return RandomNickname.get();
 100                 }
 101         };
 102
 103         /** The nickname. */
 104         private String nickname = null;
 105
 106         /** The username. */
 107         private Optional<String> username = Optional.absent();
 108
 109         /** The real name. */
 110         private Optional<String> realName = Optional.absent();
 111
 112         /** The optional password for the connection. */
 113         private Optional<String> password = Optional.absent();
 114
 115         /** The connection handler. */
 116         private ConnectionHandler connectionHandler;
 117
 118         /** Whether the connection has already been established. */
 119         private boolean established;
 120
 121         /**
 122          * Creates a new connection.
 123          *
 124          * @param eventBus
 125          *              The event bus
 126          * @param socketFactory
 127          *              The socket factory
 128          * @param hostname
 129          *              The hostname of the IRC server
 130          * @param port
 131          *              The port number of the IRC server
 132          */
 133         public Connection(EventBus eventBus, SocketFactory socketFactory, String hostname, int port) {
 134                 this.eventBus = eventBus;
 135                 this.socketFactory = socketFactory;
 136                 this.hostname = hostname;
 137                 this.port = port;
 138         }
 139
 140         //
 141         // ACCESSORS
 142         //
 143
 144         /**
 145          * Returns whether this connection has already been established.
 146          *
 147          * @return {@code true} as long as this connection is established, {@code
 148          *         false} otherwise
 149          */
 150         public boolean established() {
 151                 return established;
 152         }
 153
 154         /**
 155          * Returns the nickname that is currently in use by this connection. The
 156          * nickname is only available once the connection has been {@link #start()}ed.
 157          *
 158          * @return The current nickname
 159          */
 160         public String nickname() {
 161                 return nickname;
 162         }
 163
 164         //
 165         // MUTATORS
 166         //
 167
 168         /**
 169          * Sets the nickname chooser. The nickname chooser is only used during the
 170          * creation of the connection.
 171          *
 172          * @param nicknameChooser
 173          *              The nickname chooser
 174          * @return This connection
 175          */
 176         public Connection nicknameChooser(NicknameChooser nicknameChooser) {
 177                 this.nicknameChooser = nicknameChooser;
 178                 return this;
 179         }
 180
 181         /**
 182          * Sets the username to use.
 183          *
 184          * @param username
 185          *              The username to use
 186          * @return This connection
 187          */
 188         public Connection username(String username) {
 189                 this.username = Optional.fromNullable(username);
 190                 return this;
 191         }
 192
 193         /**
 194          * Sets the real name to use.
 195          *
 196          * @param realName
 197          *              The real name to use
 198          * @return This connection
 199          */
 200         public Connection realName(String realName) {
 201                 this.realName = Optional.fromNullable(realName);
 202                 return this;
 203         }
 204
 205         /**
 206          * Sets the optional password for the connection.
 207          *
 208          * @param password
 209          *              The password for the connection
 210          * @return This connection
 211          */
 212         public Connection password(String password) {
 213                 this.password = Optional.fromNullable(password);
 214                 return this;
 215         }
 216
 217         //
 218         // ACTIONS
 219         //
 220
 221         /**
 222          * Checks whether the given source is the client represented by this
 223          * connection.
 224          *
 225          * @param source
 226          *              The source to check
 227          * @return {@code true} if this connection represents the given source, {@code
 228          *         false} otherwise
 229          */
 230         public boolean isSource(Source source) {
 231                 return source.nick().isPresent() && source.nick().get().equals(nickname);
 232         }
 233
 234         /**
 235          * Joins the given channel.
 236          *
 237          * @param channel
 238          *              The channel to join
 239          * @throws IOException
 240          *              if an I/O error occurs
 241          */
 242         public void joinChannel(final String channel) throws IOException {
 243                 connectionHandler.sendCommand("JOIN", channel);
 244         }
 245
 246         /**
 247          * Sends a message to the given recipient, which may be a channel or another
 248          * nickname.
 249          *
 250          * @param recipient
 251          *              The recipient of the message
 252          * @param message
 253          *              The message
 254          * @throws IOException
 255          *              if an I/O error occurs
 256          */
 257         public void sendMessage(String recipient, String message) throws IOException {
 258                 connectionHandler.sendCommand("PRIVMSG", recipient, message);
 259         }
 260
 261         /**
 262          * Sends a DCC RESUME request to the given recipient.
 263          *
 264          * @param recipient
 265          *              The recipient of the request
 266          * @param filename
 267          *              The name of the file to resume
 268          * @param port
 269          *              The port number from the original DCC SEND request
 270          * @param position
 271          *              The position at which to resume the transfer
 272          * @throws IOException
 273          *              if an I/O error occurs
 274          */
 275         public void sendDccResume(String recipient, String filename, int port, long position) throws IOException {
 276                 connectionHandler.sendCommand("PRIVMSG", recipient, String.format("\u0001DCC RESUME %s %d %d\u0001", filename, port, position));
 277         }
 278
 279         //
 280         // ABSTRACTEXECUTIONTHREADSERVICE METHODS
 281         //
 282
 283         @Override
 284         protected void startUp() throws IllegalStateException {
 285                 checkState(username.isPresent(), "username must be set");
 286                 checkState(realName.isPresent(), "realName must be set");
 287         }
 288
 289         @Override
 290         protected void run() {
 291
 292                 /* connect to remote socket. */
 293                 try {
 294                         Socket socket = socketFactory.createSocket(hostname, port);
 295                         connectionHandler = new ConnectionHandler(socket.getInputStream(), socket.getOutputStream());
 296
 297                         /* register connection. */
 298                         if (password.isPresent()) {
 299                                 connectionHandler.sendCommand("PASSWORD", password.get());
 300                         }
 301                         connectionHandler.sendCommand("USER", username.get(), "8", "*", realName.get());
 302                         nickname = nicknameChooser.getNickname();
 303                         connectionHandler.sendCommand("NICK", nickname);
 304
 305                 } catch (IOException ioe1) {
 306                         eventBus.post(new ConnectionFailed(this, ioe1));
 307                         return;
 308                 }
 309
 310                 /* now read replies and react. */
 311                 try {
 312                         /* some status variables. */
 313                         int oldConnectionStatus = 0;
 314                         int connectionStatus = 0;
 315                         boolean connected = true;
 316                         StringBuilder motd = new StringBuilder();
 317                         Set<Nickname> nicks = Sets.newHashSet();
 318
 319                         /* server modes. */
 320                         Map<String, String> nickPrefixes = Maps.newHashMap();
 321                         Set<Character> channelTypes = Sets.newHashSet();
 322
 323                         while (connected) {
 324                                 Reply reply = connectionHandler.readReply();
 325                                 logger.finest(String.format("<< %s", reply));
 326                                 String command = reply.command();
 327                                 List<String> parameters = reply.parameters();
 328
 329                                 /* most common events. */
 330                                 if (command.equalsIgnoreCase("PRIVMSG")) {
 331                                         String recipient = parameters.get(0);
 332                                         String message = parameters.get(1);
 333                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 334                                                 /* CTCP! */
 335                                                 handleCtcp(reply.source().get(), message);
 336                                         } else if (!channelTypes.contains(recipient.charAt(0))) {
 337                                                 eventBus.post(new PrivateMessageReceived(this, reply.source().get(), message));
 338                                         } else {
 339                                                 eventBus.post(new ChannelMessageReceived(this, recipient, reply.source().get(), message));
 340                                         }
 341
 342                                         }
 343
 344                                 /* 43x replies are for nick change errors. */
 345                                 } else if (command.equals("431")) {
 346                                         eventBus.post(new NoNicknameGivenReceived(this, reply));
 347                                 } else if (command.equals("433")) {
 348                                         if (connectionStatus == 0) {
 349                                                 nickname = nicknameChooser.getNickname();
 350                                                 connectionHandler.sendCommand("NICK", nickname);
 351                                         } else {
 352                                                 eventBus.post(new NicknameInUseReceived(this, reply));
 353                                         }
 354
 355                                 /* client stuff. */
 356                                 } else if (command.equalsIgnoreCase("NICK")) {
 357                                         eventBus.post(new NicknameChanged(this, reply.source().get(), parameters.get(0)));
 358
 359                                 /* channel stuff. */
 360                                 } else if (command.equalsIgnoreCase("JOIN")) {
 361                                         eventBus.post(new ChannelJoined(this, parameters.get(0), reply.source().get()));
 362                                 } else if (command.equals("331")) {
 363                                         /* no topic is set. */
 364                                 } else if (command.equals("332")) {
 365                                         eventBus.post(new ChannelTopic(this, parameters.get(1), parameters.get(2)));
 366                                 } else if (command.equals("353")) {
 367                                         for (String nickname : parameters.get(3).split(" ")) {
 368                                                 if (nickPrefixes.containsKey(nickname.substring(0, 1))) {
 369                                                         nicks.add(new Nickname(nickname.substring(1), nickname.substring(0, 1)));
 370                                                 } else {
 371                                                         nicks.add(new Nickname(nickname, ""));
 372                                                 }
 373                                         }
 374                                 } else if (command.equals("366")) {
 375                                         eventBus.post(new ChannelNicknames(this, parameters.get(1), nicks));
 376                                         nicks.clear();
 377                                 } else if (command.equalsIgnoreCase("PART")) {
 378                                         eventBus.post(new ChannelLeft(this, parameters.get(0), reply.source().get(), getOptional(parameters, 1)));
 379                                 } else if (command.equalsIgnoreCase("QUIT")) {
 380                                         eventBus.post(new ClientQuit(this, reply.source().get(), parameters.get(0)));
 381
 382                                 /* common channel join errors. */
 383                                 } else if (command.equals("474")) {
 384                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.banned));
 385                                 } else if (command.equals("473")) {
 386                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.inviteOnly));
 387                                 } else if (command.equals("475")) {
 388                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.badChannelKey));
 389
 390                                 /* basic connection housekeeping. */
 391                                 } else if (command.equalsIgnoreCase("PING")) {
 392                                         connectionHandler.sendCommand("PONG", getOptional(parameters, 0), getOptional(parameters, 1));
 393
 394                                 /* replies 001-004 don’t hold information but they have to be sent on a successful connection. */
 395                                 } else if (command.equals("001")) {
 396                                         connectionStatus |= 0x01;
 397                                 } else if (command.equals("002")) {
 398                                         connectionStatus |= 0x02;
 399                                 } else if (command.equals("003")) {
 400                                         connectionStatus |= 0x04;
 401                                 } else if (command.equals("004")) {
 402                                         connectionStatus |= 0x08;
 403
 404                                 /* 005 originally was a bounce message, now used to transmit useful information about the server. */
 405                                 } else if (command.equals("005")) {
 406                                         for (String parameter : parameters) {
 407                                                 if (parameter.startsWith("PREFIX=")) {
 408                                                         int openParen = parameter.indexOf('(');
 409                                                         int closeParen = parameter.indexOf(')');
 410                                                         if ((openParen != -1) && (closeParen != -1)) {
 411                                                                 for (int modeCharacterIndex = 1; modeCharacterIndex < (closeParen - openParen); ++modeCharacterIndex) {
 412                                                                         char modeCharacter = parameter.charAt(openParen + modeCharacterIndex);
 413                                                                         char modeSymbol = parameter.charAt(closeParen + modeCharacterIndex);
 414                                                                         nickPrefixes.put(String.valueOf(modeSymbol), String.valueOf(modeCharacter));
 415                                                                 }
 416                                                                 logger.fine(String.format("Parsed Prefixes: %s", nickPrefixes));
 417                                                         }
 418                                                 } else if (parameter.startsWith("CHANTYPES=")) {
 419                                                         for (int typeIndex = 10; typeIndex < parameter.length(); ++typeIndex) {
 420                                                                 channelTypes.add(parameter.charAt(typeIndex));
 421                                                         }
 422                                                         logger.fine(String.format("Parsed Channel Types: %s", channelTypes));
 423                                                 }
 424                                         }
 425
 426                                 /* 375, 372, and 376 handle the server’s MOTD. */
 427                                 } else if (command.equals("375")) {
 428                                         /* MOTD starts. */
 429                                         motd.append(parameters.get(1)).append('\n');
 430                                 } else if (command.equals("372")) {
 431                                         motd.append(parameters.get(1)).append('\n');
 432                                 } else if (command.equals("376")) {
 433                                         motd.append(parameters.get(1)).append('\n');
 434                                         eventBus.post(new MotdReceived(this, motd.toString()));
 435                                         motd.setLength(0);
 436
 437                                 /* okay, everything else. */
 438                                 } else {
 439                                         eventBus.post(new UnknownReplyReceived(this, reply));
 440                                 }
 441
 442                                 if ((connectionStatus == 0x0f) && (connectionStatus != oldConnectionStatus)) {
 443                                         /* connection succeeded! */
 444                                         established = true;
 445                                         eventBus.post(new ConnectionEstablished(this));
 446                                 }
 447                                 oldConnectionStatus = connectionStatus;
 448                         }
 449                         eventBus.post(new ConnectionClosed(this));
 450                 } catch (IOException ioe1) {
 451                         logger.log(Level.WARNING, "I/O error", ioe1);
 452                         eventBus.post(new ConnectionClosed(this, ioe1));
 453                 } finally {
 454                         established = false;
 455                         logger.info("Closing Connection.");
 456                         try {
 457                                 Closeables.close(connectionHandler, true);
 458                         } catch (IOException ioe1) {
 459                                 /* will not be thrown. */
 460                         }
 461                 }
 462
 463         }
 464
 465         //
 466         // PRIVATE METHODS
 467         //
 468
 469         /**
 470          * Handles a CTCP message.
 471          *
 472          * @param client
 473          *              The client sending the message
 474          * @param message
 475          *              The message
 476          */
 477         private void handleCtcp(Source client, String message) {
 478                 String[] messageWords = message.substring(1, message.length() - 1).split(" +");
 479                 String ctcpCommand = messageWords[0];
 480                 if (ctcpCommand.equalsIgnoreCase("DCC")) {
 481                         if (messageWords[1].equalsIgnoreCase("SEND")) {
 482                                 Optional<InetAddress> inetAddress = parseInetAddress(messageWords[3]);
 483                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[4]));
 484                                 long fileSize = Optional.fromNullable(Longs.tryParse(messageWords[5])).or(-1L);
 485                                 if (inetAddress.isPresent() && port.isPresent()) {
 486                                         eventBus.post(new DccSendReceived(this, client, messageWords[2], inetAddress.get(), port.get(), fileSize));
 487                                 } else {
 488                                         logger.warning(String.format("Received malformed DCC SEND: “%s”", message));
 489                                 }
 490                         } else if (messageWords[1].equalsIgnoreCase("ACCEPT")) {
 491                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[3]));
 492                                 long position = Optional.fromNullable(Longs.tryParse(messageWords[4])).or(-1L);
 493                                 if (port.isPresent()) {
 494                                         eventBus.post(new DccAcceptReceived(this, client, messageWords[2], port.get(), position));
 495                                 } else {
 496                                         logger.warning(String.format("Received malformed DCC ACCEPT: “%s”", message));
 497                                 }
 498                         }
 499                 }
 500         }
 501
 502         /**
 503          * Returns an item from the list, or {@link Optional#absent()} if the list is
 504          * shorter than required for the given index.
 505          *
 506          * @param list
 507          *              The list to get an item from
 508          * @param index
 509          *              The index of the item
 510          * @param <T>
 511          *              The type of the list items
 512          * @return This list item wrapped in an {@link Optional}, or {@link
 513          *         Optional#absent()} if the list is not long enough
 514          */
 515         private static <T> Optional<T> getOptional(List<T> list, int index) {
 516                 if (index < list.size()) {
 517                         return Optional.fromNullable(list.get(index));
 518                 }
 519                 return Optional.absent();
 520         }
 521
 522         /**
 523          * Parses the given {@code ip} and returns an {@link InetAddress} from it.
 524          *
 525          * @param ip
 526          *              The IP to parse
 527          * @return The parsed inet address, or {@link Optional#absent()} if no inet
 528          *         address could be parsed
 529          */
 530         private Optional<InetAddress> parseInetAddress(String ip) {
 531                 Long ipNumber = Longs.tryParse(ip);
 532                 if (ipNumber == null) {
 533                         return Optional.absent();
 534                 }
 535
 536                 StringBuilder hostname = new StringBuilder(15);
 537                 hostname.append((ipNumber >>> 24) & 0xff).append('.');
 538                 hostname.append((ipNumber >>> 16) & 0xff).append('.');
 539                 hostname.append((ipNumber >>> 8) & 0xff).append('.');
 540                 hostname.append(ipNumber & 0xff);
 541                 try {
 542                         return Optional.of(InetAddress.getByName(hostname.toString()));
 543                 } catch (UnknownHostException uhe1) {
 544                         return Optional.absent();
 545                 }
 546         }
 547
 548         /** Handles input and output for the connection. */
 549         private class ConnectionHandler implements Closeable {
 550
 551                 /** The output stream of the connection. */
 552                 private final OutputStream outputStream;
 553
 554                 /** The input stream of the connection. */
 555                 private final BufferedReader inputStreamReader;
 556
 557                 /**
 558                  * Creates a new connection handler for the given input stream and output
 559                  * stream.
 560                  *
 561                  * @param inputStream
 562                  *              The input stream of the connection
 563                  * @param outputStream
 564                  *              The output stream of the connection
 565                  * @throws UnsupportedEncodingException
 566                  *              if the encoding (currently “UTF-8”) is not valid
 567                  */
 568                 private ConnectionHandler(InputStream inputStream, OutputStream outputStream) throws UnsupportedEncodingException {
 569                         this.outputStream = outputStream;
 570                         inputStreamReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
 571                 }
 572
 573                 //
 574                 // ACTIONS
 575                 //
 576
 577                 /**
 578                  * Sends a command with the given parameters, skipping all {@link
 579                  * Optional#absent()} optionals.
 580                  *
 581                  * @param command
 582                  *              The command to send
 583                  * @param parameters
 584                  *              The parameters
 585                  * @throws IOException
 586                  *              if an I/O error occurs
 587                  */
 588                 public void sendCommand(String command, Optional<String>... parameters) throws IOException {
 589                         List<String> setParameters = new ArrayList<String>();
 590                         for (Optional<String> maybeSetParameter : parameters) {
 591                                 if (maybeSetParameter.isPresent()) {
 592                                         setParameters.add(maybeSetParameter.get());
 593                                 }
 594                         }
 595                         sendCommand(command, setParameters.toArray(new String[setParameters.size()]));
 596                 }
 597
 598                 /**
 599                  * Sends a command with the given parameters.
 600                  *
 601                  * @param command
 602                  *              The command to send
 603                  * @param parameters
 604                  *              The parameters of the command
 605                  * @throws IOException
 606                  *              if an I/O error occurs
 607                  * @throws IllegalArgumentException
 608                  *              if any parameter but that last contains a space character
 609                  */
 610                 public void sendCommand(String command, String... parameters) throws IOException, IllegalArgumentException {
 611                         StringBuilder commandBuilder = new StringBuilder();
 612
 613                         commandBuilder.append(command);
 614                         for (int parameterIndex = 0; parameterIndex < parameters.length; ++parameterIndex) {
 615                                 String parameter = parameters[parameterIndex];
 616                                 /* space is only allowed in the last parameter. */
 617                                 commandBuilder.append(' ');
 618                                 if (parameter.contains(" ")) {
 619                                         if (parameterIndex == (parameters.length - 1)) {
 620                                                 commandBuilder.append(':');
 621                                         } else {
 622                                                 throw new IllegalArgumentException(String.format("parameter “%s” must not contain space!", parameter));
 623                                         }
 624                                 }
 625                                 commandBuilder.append(parameter);
 626                         }
 627
 628                         logger.finest(String.format(">> %s", commandBuilder));
 629                         outputStream.write((commandBuilder.toString() + "\r\n").getBytes("UTF-8"));
 630                         outputStream.flush();
 631                 }
 632
 633                 /**
 634                  * Reads a line of reply from the connection.
 635                  *
 636                  * @return The reply
 637                  * @throws IOException
 638                  *              if an I/O error occurs
 639                  * @throws EOFException
 640                  *              if EOF was reached
 641                  */
 642                 public Reply readReply() throws IOException, EOFException {
 643                         String line = inputStreamReader.readLine();
 644                         if (line == null) {
 645                                 throw new EOFException();
 646                         }
 647
 648                         return Reply.parseLine(line);
 649                 }
 650
 651                 //
 652                 // CLOSEABLE METHODS
 653                 //
 654
 655                 @Override
 656                 public void close() throws IOException {
 657                         Closeables.close(outputStream, true);
 658                         Closeables.close(inputStreamReader, true);
 659                 }
 660
 661         }
 662
 663 }