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 import static java.util.Arrays.asList;
  22 import static java.util.concurrent.TimeUnit.SECONDS;
  23
  24 import java.io.BufferedReader;
  25 import java.io.Closeable;
  26 import java.io.EOFException;
  27 import java.io.IOException;
  28 import java.io.InputStream;
  29 import java.io.InputStreamReader;
  30 import java.io.OutputStream;
  31 import java.io.UnsupportedEncodingException;
  32 import java.net.Socket;
  33 import java.util.ArrayList;
  34 import java.util.List;
  35 import java.util.concurrent.TimeUnit;
  36 import java.util.concurrent.atomic.AtomicBoolean;
  37
  38 import javax.net.SocketFactory;
  39
  40 import net.pterodactylus.irc.connection.ChannelNickHandler;
  41 import net.pterodactylus.irc.connection.ChannelNotJoinedHandler;
  42 import net.pterodactylus.irc.connection.ConnectionEstablishHandler;
  43 import net.pterodactylus.irc.connection.CtcpHandler;
  44 import net.pterodactylus.irc.connection.Handler;
  45 import net.pterodactylus.irc.connection.MessageHandler;
  46 import net.pterodactylus.irc.connection.MotdHandler;
  47 import net.pterodactylus.irc.connection.PrefixHandler;
  48 import net.pterodactylus.irc.connection.SimpleCommandHandler;
  49 import net.pterodactylus.irc.event.ChannelJoined;
  50 import net.pterodactylus.irc.event.ChannelLeft;
  51 import net.pterodactylus.irc.event.ChannelTopic;
  52 import net.pterodactylus.irc.event.ClientQuit;
  53 import net.pterodactylus.irc.event.ConnectionClosed;
  54 import net.pterodactylus.irc.event.ConnectionEstablished;
  55 import net.pterodactylus.irc.event.ConnectionFailed;
  56 import net.pterodactylus.irc.event.KickedFromChannel;
  57 import net.pterodactylus.irc.event.NicknameChanged;
  58 import net.pterodactylus.irc.event.NicknameInUseReceived;
  59 import net.pterodactylus.irc.event.NoNicknameGivenReceived;
  60 import net.pterodactylus.irc.event.ReplyReceived;
  61 import net.pterodactylus.irc.event.UnknownReplyReceived;
  62 import net.pterodactylus.irc.util.RandomNickname;
  63 import net.pterodactylus.xdcc.util.io.BandwidthCountingInputStream;
  64 import net.pterodactylus.xdcc.util.io.BandwidthCountingOutputStream;
  65
  66 import com.google.common.base.Optional;
  67 import com.google.common.eventbus.EventBus;
  68 import com.google.common.eventbus.Subscribe;
  69 import com.google.common.io.Closeables;
  70 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  71 import com.google.common.util.concurrent.Service;
  72 import org.apache.log4j.Logger;
  73
  74 /**
  75  * A connection to an IRC server.
  76  *
  77  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  78  */
  79 public class Connection extends AbstractExecutionThreadService implements Service {
  80
  81         /* The logger. */
  82         private static final Logger logger = Logger.getLogger(Connection.class.getName());
  83
  84         /** The event bus. */
  85         private final EventBus eventBus;
  86
  87         /** The socket factory. */
  88         private final SocketFactory socketFactory;
  89
  90         /** The hostname to connect to. */
  91         private final String hostname;
  92
  93         /** The port to connect to. */
  94         private final int port;
  95
  96         /** The nickname chooser. */
  97         private NicknameChooser nicknameChooser = new NicknameChooser() {
  98
  99                 @Override
 100                 public String getNickname() {
 101                         return RandomNickname.get();
 102                 }
 103         };
 104
 105         /** The nickname. */
 106         private String nickname = null;
 107
 108         /** The username. */
 109         private Optional<String> username = Optional.absent();
 110
 111         /** The real name. */
 112         private Optional<String> realName = Optional.absent();
 113
 114         /** The optional password for the connection. */
 115         private Optional<String> password = Optional.absent();
 116
 117         /** The connection handler. */
 118         private ConnectionHandler connectionHandler;
 119
 120         /** Whether the connection has already been established. */
 121         private final AtomicBoolean established = new AtomicBoolean();
 122
 123         /**
 124          * Creates a new connection.
 125          *
 126          * @param eventBus
 127          *              The event bus
 128          * @param socketFactory
 129          *              The socket factory
 130          * @param hostname
 131          *              The hostname of the IRC server
 132          * @param port
 133          *              The port number of the IRC server
 134          */
 135         public Connection(EventBus eventBus, SocketFactory socketFactory, String hostname, int port) {
 136                 this.eventBus = eventBus;
 137                 this.socketFactory = socketFactory;
 138                 this.hostname = hostname;
 139                 this.port = port;
 140         }
 141
 142         //
 143         // ACCESSORS
 144         //
 145
 146         /**
 147          * Returns the hostname of the remote end of the connection.
 148          *
 149          * @return The remote’s hostname
 150          */
 151         public String hostname() {
 152                 return hostname;
 153         }
 154
 155         /**
 156          * Returns the port number of the remote end of the connection.
 157          *
 158          * @return The remote’s port number
 159          */
 160         public int port() {
 161                 return port;
 162         }
 163
 164         /**
 165          * Returns whether this connection has already been established.
 166          *
 167          * @return {@code true} as long as this connection is established, {@code
 168          *         false} otherwise
 169          */
 170         public boolean established() {
 171                 return established.get();
 172         }
 173
 174         /**
 175          * Returns the nickname that is currently in use by this connection. The
 176          * nickname is only available once the connection has been {@link #start()}ed.
 177          *
 178          * @return The current nickname
 179          */
 180         public String nickname() {
 181                 return nickname;
 182         }
 183
 184         //
 185         // MUTATORS
 186         //
 187
 188         /**
 189          * Sets the nickname chooser. The nickname chooser is only used during the
 190          * creation of the connection.
 191          *
 192          * @param nicknameChooser
 193          *              The nickname chooser
 194          * @return This connection
 195          */
 196         public Connection nicknameChooser(NicknameChooser nicknameChooser) {
 197                 this.nicknameChooser = nicknameChooser;
 198                 return this;
 199         }
 200
 201         /**
 202          * Sets the username to use.
 203          *
 204          * @param username
 205          *              The username to use
 206          * @return This connection
 207          */
 208         public Connection username(String username) {
 209                 this.username = Optional.fromNullable(username);
 210                 return this;
 211         }
 212
 213         /**
 214          * Sets the real name to use.
 215          *
 216          * @param realName
 217          *              The real name to use
 218          * @return This connection
 219          */
 220         public Connection realName(String realName) {
 221                 this.realName = Optional.fromNullable(realName);
 222                 return this;
 223         }
 224
 225         /**
 226          * Sets the optional password for the connection.
 227          *
 228          * @param password
 229          *              The password for the connection
 230          * @return This connection
 231          */
 232         public Connection password(String password) {
 233                 this.password = Optional.fromNullable(password);
 234                 return this;
 235         }
 236
 237         //
 238         // ACTIONS
 239         //
 240
 241         /**
 242          * Returns the current rate of the connection’s incoming side.
 243          *
 244          * @return The current input rate (in bytes per second)
 245          */
 246         public long getInputRate() {
 247                 return (connectionHandler != null) ? connectionHandler.getInputRate() : 0;
 248         }
 249
 250         /**
 251          * Returns the current rate of the connection’s outgoing side.
 252          *
 253          * @return The current output rate (in bytes per second)
 254          */
 255         public long getOutputRate() {
 256                 return (connectionHandler != null) ? connectionHandler.getOutputRate() : 0;
 257         }
 258
 259         /**
 260          * Checks whether the given source is the client represented by this
 261          * connection.
 262          *
 263          * @param source
 264          *              The source to check
 265          * @return {@code true} if this connection represents the given source, {@code
 266          *         false} otherwise
 267          */
 268         public boolean isSource(Source source) {
 269                 return source.nick().isPresent() && source.nick().get().equals(nickname);
 270         }
 271
 272         /**
 273          * Joins the given channel.
 274          *
 275          * @param channel
 276          *              The channel to join
 277          * @throws IOException
 278          *              if an I/O error occurs
 279          */
 280         public void joinChannel(final String channel) throws IOException {
 281                 connectionHandler.sendCommand("JOIN", channel);
 282         }
 283
 284         /**
 285          * Sends a message to the given recipient, which may be a channel or another
 286          * nickname.
 287          *
 288          * @param recipient
 289          *              The recipient of the message
 290          * @param message
 291          *              The message
 292          * @throws IOException
 293          *              if an I/O error occurs
 294          */
 295         public void sendMessage(String recipient, String message) throws IOException {
 296                 connectionHandler.sendCommand("PRIVMSG", recipient, message);
 297         }
 298
 299         /**
 300          * Sends a DCC RESUME request to the given recipient.
 301          *
 302          * @param recipient
 303          *              The recipient of the request
 304          * @param filename
 305          *              The name of the file to resume
 306          * @param port
 307          *              The port number from the original DCC SEND request
 308          * @param position
 309          *              The position at which to resume the transfer
 310          * @throws IOException
 311          *              if an I/O error occurs
 312          */
 313         public void sendDccResume(String recipient, String filename, int port, long position) throws IOException {
 314                 connectionHandler.sendCommand("PRIVMSG", recipient, String.format("\u0001DCC RESUME %s %d %d\u0001", filename, port, position));
 315         }
 316
 317         /**
 318          * Closes this connection.
 319          *
 320          * @throws IOException
 321          *              if an I/O error occurs
 322          */
 323         public void close() throws IOException {
 324                 if (connectionHandler != null) {
 325                         connectionHandler.close();
 326                 }
 327         }
 328
 329         //
 330         // ABSTRACTEXECUTIONTHREADSERVICE METHODS
 331         //
 332
 333         @Override
 334         protected void startUp() throws IllegalStateException {
 335                 checkState(username.isPresent(), "username must be set");
 336                 checkState(realName.isPresent(), "realName must be set");
 337         }
 338
 339         @Override
 340         protected void run() {
 341
 342                 /* connect to remote socket. */
 343                 try {
 344                         Socket socket = socketFactory.createSocket(hostname, port);
 345                         socket.setSoTimeout((int) TimeUnit.MINUTES.toMillis(3));
 346                         connectionHandler = new ConnectionHandler(socket.getInputStream(), socket.getOutputStream());
 347
 348                         /* register connection. */
 349                         if (password.isPresent()) {
 350                                 connectionHandler.sendCommand("PASSWORD", password.get());
 351                         }
 352                         connectionHandler.sendCommand("USER", username.get(), "8", "*", realName.get());
 353                         nickname = nicknameChooser.getNickname();
 354                         connectionHandler.sendCommand("NICK", nickname);
 355
 356                 } catch (IOException ioe1) {
 357                         eventBus.post(new ConnectionFailed(this, ioe1));
 358                         return;
 359                 }
 360
 361                 eventBus.register(this);
 362                 /* now read replies and react. */
 363                 try {
 364                         /* some status variables. */
 365                         boolean connected = true;
 366
 367                         PrefixHandler prefixHandler = new PrefixHandler();
 368                         List<Handler> handlers = asList(
 369                                         new MessageHandler(eventBus, this, prefixHandler),
 370                                         new CtcpHandler(eventBus, this),
 371                                         new ChannelNickHandler(eventBus, this, prefixHandler),
 372                                         new SimpleCommandHandler(eventBus)
 373                                                         .addCommand("431",
 374                                                                         (s, p) -> new NoNicknameGivenReceived(
 375                                                                                         this))
 376                                                         .addCommand("NICK",
 377                                                                         (s, p) -> new NicknameChanged(this,
 378                                                                                         s.get(), p.get(0)))
 379                                                         .addCommand("JOIN",
 380                                                                         (s, p) -> new ChannelJoined(this,
 381                                                                                         p.get(0), s.get()))
 382                                                         .addCommand("332",
 383                                                                         (s, p) -> new ChannelTopic(this, p.get(1),
 384                                                                                         p.get(2)))
 385                                                         .addCommand("PART",
 386                                                                         (s, p) -> new ChannelLeft(this, p.get(0),
 387                                                                                         s.get(), getOptional(p, 1)))
 388                                                         .addCommand("QUIT",
 389                                                                         (s, p) -> new ClientQuit(this, s.get(),
 390                                                                                         p.get(0)))
 391                                                         .addCommand("KICK",
 392                                                                         (s, p) -> new KickedFromChannel(this,
 393                                                                                         p.get(0), s.get(), p.get(1),
 394                                                                                         getOptional(p, 2))),
 395                                         new MotdHandler(eventBus, this),
 396                                         new ChannelNotJoinedHandler(eventBus, this),
 397                                         new ConnectionEstablishHandler(eventBus, this),
 398                                         prefixHandler
 399                         );
 400
 401                         while (connected) {
 402                                 Reply reply = connectionHandler.readReply();
 403                                 eventBus.post(new ReplyReceived(this, reply));
 404                                 logger.trace(String.format("<< %s", reply));
 405                                 String command = reply.command();
 406                                 List<String> parameters = reply.parameters();
 407
 408                                 for (Handler handler : handlers) {
 409                                         if (handler.willHandle(reply)) {
 410                                                 handler.handleReply(reply);
 411                                                 break;
 412                                         }
 413                                 }
 414
 415                                 /* 43x replies are for nick change errors. */
 416                                 if (command.equals("433")) {
 417                                         if (!established.get()) {
 418                                                 nickname = nicknameChooser.getNickname();
 419                                                 connectionHandler.sendCommand("NICK", nickname);
 420                                         } else {
 421                                                 eventBus.post(new NicknameInUseReceived(this, reply));
 422                                         }
 423
 424                                 /* channel stuff. */
 425                                 } else if (command.equals("331")) {
 426                                         /* no topic is set. */
 427
 428                                 /* basic connection housekeeping. */
 429                                 } else if (command.equalsIgnoreCase("PING")) {
 430                                         connectionHandler.sendCommand("PONG", getOptional(parameters, 0), getOptional(parameters, 1));
 431
 432                                 /* okay, everything else. */
 433                                 } else {
 434                                         eventBus.post(new UnknownReplyReceived(this, reply));
 435                                 }
 436                         }
 437                         eventBus.post(new ConnectionClosed(this));
 438                 } catch (IOException ioe1) {
 439                         logger.warn("I/O error", ioe1);
 440                         eventBus.post(new ConnectionClosed(this, ioe1));
 441                 } catch (RuntimeException re1) {
 442                         logger.error("Runtime error", re1);
 443                         eventBus.post(new ConnectionClosed(this, re1));
 444                 } finally {
 445                         established.set(false);
 446                         eventBus.unregister(this);
 447                         logger.info("Closing Connection.");
 448                         try {
 449                                 Closeables.close(connectionHandler, true);
 450                         } catch (IOException ioe1) {
 451                                 /* will not be thrown. */
 452                         }
 453                 }
 454
 455         }
 456
 457         @Subscribe
 458         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 459                 if (connectionEstablished.connection() == this) {
 460                         established.set(true);
 461                 }
 462         }
 463
 464         //
 465         // PRIVATE METHODS
 466         //
 467
 468         /**
 469          * Returns an item from the list, or {@link Optional#absent()} if the list is
 470          * shorter than required for the given index.
 471          *
 472          * @param list
 473          *              The list to get an item from
 474          * @param index
 475          *              The index of the item
 476          * @param <T>
 477          *              The type of the list items
 478          * @return This list item wrapped in an {@link Optional}, or {@link
 479          *         Optional#absent()} if the list is not long enough
 480          */
 481         private static <T> Optional<T> getOptional(List<T> list, int index) {
 482                 if (index < list.size()) {
 483                         return Optional.fromNullable(list.get(index));
 484                 }
 485                 return Optional.absent();
 486         }
 487
 488         /** Handles input and output for the connection. */
 489         private class ConnectionHandler implements Closeable {
 490
 491                 /** The output stream of the connection. */
 492                 private final BandwidthCountingOutputStream outputStream;
 493
 494                 /** The input stream. */
 495                 private final BandwidthCountingInputStream inputStream;
 496
 497                 /** The input stream of the connection. */
 498                 private final BufferedReader inputStreamReader;
 499
 500                 /**
 501                  * Creates a new connection handler for the given input stream and output
 502                  * stream.
 503                  *
 504                  * @param inputStream
 505                  *              The input stream of the connection
 506                  * @param outputStream
 507                  *              The output stream of the connection
 508                  * @throws UnsupportedEncodingException
 509                  *              if the encoding (currently “UTF-8”) is not valid
 510                  */
 511                 private ConnectionHandler(InputStream inputStream, OutputStream outputStream) throws UnsupportedEncodingException {
 512                         this.outputStream = new BandwidthCountingOutputStream(outputStream, 5, SECONDS);
 513                         this.inputStream = new BandwidthCountingInputStream(inputStream, 5, SECONDS);
 514                         inputStreamReader = new BufferedReader(new InputStreamReader(this.inputStream, "UTF-8"));
 515                 }
 516
 517                 //
 518                 // ACTIONS
 519                 //
 520
 521                 /**
 522                  * Returns the current rate of the connection’s incoming side.
 523                  *
 524                  * @return The current input rate (in bytes per second)
 525                  */
 526                 public long getInputRate() {
 527                         return inputStream.getCurrentRate();
 528                 }
 529
 530                 /**
 531                  * Returns the current rate of the connection’s outgoing side.
 532                  *
 533                  * @return The current output rate (in bytes per second)
 534                  */
 535                 public long getOutputRate() {
 536                         return outputStream.getCurrentRate();
 537                 }
 538
 539                 /**
 540                  * Sends a command with the given parameters, skipping all {@link
 541                  * Optional#absent()} optionals.
 542                  *
 543                  * @param command
 544                  *              The command to send
 545                  * @param parameters
 546                  *              The parameters
 547                  * @throws IOException
 548                  *              if an I/O error occurs
 549                  */
 550                 public void sendCommand(String command, Optional<String>... parameters) throws IOException {
 551                         List<String> setParameters = new ArrayList<String>();
 552                         for (Optional<String> maybeSetParameter : parameters) {
 553                                 if (maybeSetParameter.isPresent()) {
 554                                         setParameters.add(maybeSetParameter.get());
 555                                 }
 556                         }
 557                         sendCommand(command, setParameters.toArray(new String[setParameters.size()]));
 558                 }
 559
 560                 /**
 561                  * Sends a command with the given parameters.
 562                  *
 563                  * @param command
 564                  *              The command to send
 565                  * @param parameters
 566                  *              The parameters of the command
 567                  * @throws IOException
 568                  *              if an I/O error occurs
 569                  * @throws IllegalArgumentException
 570                  *              if any parameter but that last contains a space character
 571                  */
 572                 public void sendCommand(String command, String... parameters) throws IOException, IllegalArgumentException {
 573                         StringBuilder commandBuilder = new StringBuilder();
 574
 575                         commandBuilder.append(command);
 576                         for (int parameterIndex = 0; parameterIndex < parameters.length; ++parameterIndex) {
 577                                 String parameter = parameters[parameterIndex];
 578                                 /* space is only allowed in the last parameter. */
 579                                 commandBuilder.append(' ');
 580                                 if (parameter.contains(" ")) {
 581                                         if (parameterIndex == (parameters.length - 1)) {
 582                                                 commandBuilder.append(':');
 583                                         } else {
 584                                                 throw new IllegalArgumentException(String.format("parameter “%s” must not contain space!", parameter));
 585                                         }
 586                                 }
 587                                 commandBuilder.append(parameter);
 588                         }
 589
 590                         logger.trace(String.format(">> %s", commandBuilder));
 591                         outputStream.write((commandBuilder.toString() + "\r\n").getBytes("UTF-8"));
 592                         outputStream.flush();
 593                 }
 594
 595                 /**
 596                  * Reads a line of reply from the connection.
 597                  *
 598                  * @return The reply
 599                  * @throws IOException
 600                  *              if an I/O error occurs
 601                  * @throws EOFException
 602                  *              if EOF was reached
 603                  */
 604                 public Reply readReply() throws IOException, EOFException {
 605                         String line = inputStreamReader.readLine();
 606                         if (line == null) {
 607                                 throw new EOFException();
 608                         }
 609
 610                         return Reply.parseLine(line);
 611                 }
 612
 613                 //
 614                 // CLOSEABLE METHODS
 615                 //
 616
 617                 @Override
 618                 public void close() throws IOException {
 619                         Closeables.close(outputStream, true);
 620                         Closeables.close(inputStreamReader, true);
 621                         Closeables.close(inputStream, true);
 622                 }
 623
 624         }
 625
 626 }