src/net/pterodactylus/fcp/FcpConnection.java

   1 /*
   2  * jSite2 - FpcConnection.java -
   3  * Copyright © 2008 David Roden
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 package net.pterodactylus.fcp;
  21
  22 import java.io.Closeable;
  23 import java.io.FilterInputStream;
  24 import java.io.IOException;
  25 import java.io.InputStream;
  26 import java.io.OutputStream;
  27 import java.net.InetAddress;
  28 import java.net.Socket;
  29 import java.net.UnknownHostException;
  30 import java.util.Collections;
  31 import java.util.HashMap;
  32 import java.util.Map;
  33 import java.util.logging.Logger;
  34
  35 /**
  36  * An FCP connection to a Freenet node.
  37  *
  38  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  39  */
  40 public class FcpConnection implements Closeable {
  41
  42         /** Logger. */
  43         private static final Logger logger = Logger.getLogger(FcpConnection.class.getName());
  44
  45         /** The default port for FCP v2. */
  46         public static final int DEFAULT_PORT = 9481;
  47
  48         /** Listener management. */
  49         private final FcpListenerManager fcpListenerManager = new FcpListenerManager(this);
  50
  51         /** The address of the node. */
  52         private final InetAddress address;
  53
  54         /** The port number of the node’s FCP port. */
  55         private final int port;
  56
  57         /** The remote socket. */
  58         private Socket remoteSocket;
  59
  60         /** The input stream from the node. */
  61         private InputStream remoteInputStream;
  62
  63         /** The output stream to the node. */
  64         private OutputStream remoteOutputStream;
  65
  66         /** The connection handler. */
  67         private FcpConnectionHandler connectionHandler;
  68
  69         /** Incoming message statistics. */
  70         private Map<String, Integer> incomingMessageStatistics = Collections.synchronizedMap(new HashMap<String, Integer>());
  71
  72         /**
  73          * Creates a new FCP connection to the freenet node running on localhost,
  74          * using the default port.
  75          *
  76          * @throws UnknownHostException
  77          *             if the hostname can not be resolved
  78          */
  79         public FcpConnection() throws UnknownHostException {
  80                 this(InetAddress.getLocalHost());
  81         }
  82
  83         /**
  84          * Creates a new FCP connection to the Freenet node running on the given
  85          * host, listening on the default port.
  86          *
  87          * @param host
  88          *            The hostname of the Freenet node
  89          * @throws UnknownHostException
  90          *             if <code>host</code> can not be resolved
  91          */
  92         public FcpConnection(String host) throws UnknownHostException {
  93                 this(host, DEFAULT_PORT);
  94         }
  95
  96         /**
  97          * Creates a new FCP connection to the Freenet node running on the given
  98          * host, listening on the given port.
  99          *
 100          * @param host
 101          *            The hostname of the Freenet node
 102          * @param port
 103          *            The port number of the node’s FCP port
 104          * @throws UnknownHostException
 105          *             if <code>host</code> can not be resolved
 106          */
 107         public FcpConnection(String host, int port) throws UnknownHostException {
 108                 this(InetAddress.getByName(host), port);
 109         }
 110
 111         /**
 112          * Creates a new FCP connection to the Freenet node running at the given
 113          * address, listening on the default port.
 114          *
 115          * @param address
 116          *            The address of the Freenet node
 117          */
 118         public FcpConnection(InetAddress address) {
 119                 this(address, DEFAULT_PORT);
 120         }
 121
 122         /**
 123          * Creates a new FCP connection to the Freenet node running at the given
 124          * address, listening on the given port.
 125          *
 126          * @param address
 127          *            The address of the Freenet node
 128          * @param port
 129          *            The port number of the node’s FCP port
 130          */
 131         public FcpConnection(InetAddress address, int port) {
 132                 this.address = address;
 133                 this.port = port;
 134         }
 135
 136         //
 137         // LISTENER MANAGEMENT
 138         //
 139
 140         /**
 141          * Adds the given listener to the list of listeners.
 142          *
 143          * @param fcpListener
 144          *            The listener to add
 145          */
 146         public void addFcpListener(FcpListener fcpListener) {
 147                 fcpListenerManager.addListener(fcpListener);
 148         }
 149
 150         /**
 151          * Removes the given listener from the list of listeners.
 152          *
 153          * @param fcpListener
 154          *            The listener to remove
 155          */
 156         public void removeFcpListener(FcpListener fcpListener) {
 157                 fcpListenerManager.removeListener(fcpListener);
 158         }
 159
 160         //
 161         // ACTIONS
 162         //
 163
 164         /**
 165          * Connects to the node.
 166          *
 167          * @throws IOException
 168          *             if an I/O error occurs
 169          * @throws IllegalStateException
 170          *             if there is already a connection to the node
 171          */
 172         public synchronized void connect() throws IOException, IllegalStateException {
 173                 if (connectionHandler != null) {
 174                         throw new IllegalStateException("already connected, disconnect first");
 175                 }
 176                 logger.info("connecting to " + address + ":" + port + "…");
 177                 remoteSocket = new Socket(address, port);
 178                 remoteInputStream = remoteSocket.getInputStream();
 179                 remoteOutputStream = remoteSocket.getOutputStream();
 180                 new Thread(connectionHandler = new FcpConnectionHandler(this, remoteInputStream)).start();
 181         }
 182
 183         /**
 184          * Disconnects from the node. If there is no connection to the node, this
 185          * method does nothing.
 186          *
 187          * @deprecated Use {@link #close()} instead
 188          */
 189         @Deprecated
 190         public synchronized void disconnect() {
 191                 close();
 192         }
 193
 194         /**
 195          * Closes the connection. If there is no connection to the node, this method
 196          * does nothing.
 197          */
 198         public void close() {
 199                 handleDisconnect(null);
 200         }
 201
 202         /**
 203          * Sends the given FCP message.
 204          *
 205          * @param fcpMessage
 206          *            The FCP message to send
 207          * @throws IOException
 208          *             if an I/O error occurs
 209          */
 210         public synchronized void sendMessage(FcpMessage fcpMessage) throws IOException {
 211                 logger.fine("sending message: " + fcpMessage.getName());
 212                 fcpMessage.write(remoteOutputStream);
 213         }
 214
 215         //
 216         // PACKAGE-PRIVATE METHODS
 217         //
 218
 219         /**
 220          * Handles the given message, notifying listeners. This message should only
 221          * be called by {@link FcpConnectionHandler}.
 222          *
 223          * @param fcpMessage
 224          *            The received message
 225          */
 226         void handleMessage(FcpMessage fcpMessage) {
 227                 logger.fine("received message: " + fcpMessage.getName());
 228                 String messageName = fcpMessage.getName();
 229                 countMessage(messageName);
 230                 if ("SimpleProgress".equals(messageName)) {
 231                         fcpListenerManager.fireReceivedSimpleProgress(new SimpleProgress(fcpMessage));
 232                 } else if ("ProtocolError".equals(messageName)) {
 233                         fcpListenerManager.fireReceivedProtocolError(new ProtocolError(fcpMessage));
 234                 } else if ("PersistentGet".equals(messageName)) {
 235                         fcpListenerManager.fireReceivedPersistentGet(new PersistentGet(fcpMessage));
 236                 } else if ("PersistentPut".equals(messageName)) {
 237                         fcpListenerManager.fireReceivedPersistentPut(new PersistentPut(fcpMessage));
 238                 } else if ("PersistentPutDir".equals(messageName)) {
 239                         fcpListenerManager.fireReceivedPersistentPutDir(new PersistentPutDir(fcpMessage));
 240                 } else if ("URIGenerated".equals(messageName)) {
 241                         fcpListenerManager.fireReceivedURIGenerated(new URIGenerated(fcpMessage));
 242                 } else if ("EndListPersistentRequests".equals(messageName)) {
 243                         fcpListenerManager.fireReceivedEndListPersistentRequests(new EndListPersistentRequests(fcpMessage));
 244                 } else if ("Peer".equals(messageName)) {
 245                         fcpListenerManager.fireReceivedPeer(new Peer(fcpMessage));
 246                 } else if ("PeerNote".equals(messageName)) {
 247                         fcpListenerManager.fireReceivedPeerNote(new PeerNote(fcpMessage));
 248                 } else if ("StartedCompression".equals(messageName)) {
 249                         fcpListenerManager.fireReceivedStartedCompression(new StartedCompression(fcpMessage));
 250                 } else if ("FinishedCompression".equals(messageName)) {
 251                         fcpListenerManager.fireReceivedFinishedCompression(new FinishedCompression(fcpMessage));
 252                 } else if ("GetFailed".equals(messageName)) {
 253                         fcpListenerManager.fireReceivedGetFailed(new GetFailed(fcpMessage));
 254                 } else if ("PutFetchable".equals(messageName)) {
 255                         fcpListenerManager.fireReceivedPutFetchable(new PutFetchable(fcpMessage));
 256                 } else if ("PutSuccessful".equals(messageName)) {
 257                         fcpListenerManager.fireReceivedPutSuccessful(new PutSuccessful(fcpMessage));
 258                 } else if ("PutFailed".equals(messageName)) {
 259                         fcpListenerManager.fireReceivedPutFailed(new PutFailed(fcpMessage));
 260                 } else if ("DataFound".equals(messageName)) {
 261                         fcpListenerManager.fireReceivedDataFound(new DataFound(fcpMessage));
 262                 } else if ("SubscribedUSKUpdate".equals(messageName)) {
 263                         fcpListenerManager.fireReceivedSubscribedUSKUpdate(new SubscribedUSKUpdate(fcpMessage));
 264                 } else if ("IdentifierCollision".equals(messageName)) {
 265                         fcpListenerManager.fireReceivedIdentifierCollision(new IdentifierCollision(fcpMessage));
 266                 } else if ("AllData".equals(messageName)) {
 267                         LimitedInputStream payloadInputStream = getInputStream(FcpUtils.safeParseLong(fcpMessage.getField("DataLength")));
 268                         fcpListenerManager.fireReceivedAllData(new AllData(fcpMessage, payloadInputStream));
 269                         try {
 270                                 payloadInputStream.consume();
 271                         } catch (IOException ioe1) {
 272                                 /* well, ignore. when the connection handler fails, all fails. */
 273                         }
 274                 } else if ("EndListPeerNotes".equals(messageName)) {
 275                         fcpListenerManager.fireReceivedEndListPeerNotes(new EndListPeerNotes(fcpMessage));
 276                 } else if ("EndListPeers".equals(messageName)) {
 277                         fcpListenerManager.fireReceivedEndListPeers(new EndListPeers(fcpMessage));
 278                 } else if ("SSKKeypair".equals(messageName)) {
 279                         fcpListenerManager.fireReceivedSSKKeypair(new SSKKeypair(fcpMessage));
 280                 } else if ("PeerRemoved".equals(messageName)) {
 281                         fcpListenerManager.fireReceivedPeerRemoved(new PeerRemoved(fcpMessage));
 282                 } else if ("PersistentRequestModified".equals(messageName)) {
 283                         fcpListenerManager.fireReceivedPersistentRequestModified(new PersistentRequestModified(fcpMessage));
 284                 } else if ("PersistentRequestRemoved".equals(messageName)) {
 285                         fcpListenerManager.fireReceivedPersistentRequestRemoved(new PersistentRequestRemoved(fcpMessage));
 286                 } else if ("UnknownPeerNoteType".equals(messageName)) {
 287                         fcpListenerManager.fireReceivedUnknownPeerNoteType(new UnknownPeerNoteType(fcpMessage));
 288                 } else if ("UnknownNodeIdentifier".equals(messageName)) {
 289                         fcpListenerManager.fireReceivedUnknownNodeIdentifier(new UnknownNodeIdentifier(fcpMessage));
 290                 } else if ("FCPPluginReply".equals(messageName)) {
 291                         LimitedInputStream payloadInputStream = getInputStream(FcpUtils.safeParseLong(fcpMessage.getField("DataLength")));
 292                         fcpListenerManager.fireReceivedFCPPluginReply(new FCPPluginReply(fcpMessage, payloadInputStream));
 293                         try {
 294                                 payloadInputStream.consume();
 295                         } catch (IOException ioe1) {
 296                                 /* ignore. */
 297                         }
 298                 } else if ("PluginInfo".equals(messageName)) {
 299                         fcpListenerManager.fireReceivedPluginInfo(new PluginInfo(fcpMessage));
 300                 } else if ("NodeData".equals(messageName)) {
 301                         fcpListenerManager.fireReceivedNodeData(new NodeData(fcpMessage));
 302                 } else if ("TestDDAReply".equals(messageName)) {
 303                         fcpListenerManager.fireReceivedTestDDAReply(new TestDDAReply(fcpMessage));
 304                 } else if ("TestDDAComplete".equals(messageName)) {
 305                         fcpListenerManager.fireReceivedTestDDAComplete(new TestDDAComplete(fcpMessage));
 306                 } else if ("ConfigData".equals(messageName)) {
 307                         fcpListenerManager.fireReceivedConfigData(new ConfigData(fcpMessage));
 308                 } else if ("NodeHello".equals(messageName)) {
 309                         fcpListenerManager.fireReceivedNodeHello(new NodeHello(fcpMessage));
 310                 } else if ("CloseConnectionDuplicateClientName".equals(messageName)) {
 311                         fcpListenerManager.fireReceivedCloseConnectionDuplicateClientName(new CloseConnectionDuplicateClientName(fcpMessage));
 312                 } else {
 313                         fcpListenerManager.fireMessageReceived(fcpMessage);
 314                 }
 315         }
 316
 317         /**
 318          * Handles a disconnect from the node.
 319          *
 320          * @param throwable
 321          *            The exception that caused the disconnect, or <code>null</code>
 322          *            if there was no exception
 323          */
 324         synchronized void handleDisconnect(Throwable throwable) {
 325                 FcpUtils.close(remoteInputStream);
 326                 FcpUtils.close(remoteOutputStream);
 327                 FcpUtils.close(remoteSocket);
 328                 if (connectionHandler != null) {
 329                         connectionHandler.stop();
 330                         connectionHandler = null;
 331                         fcpListenerManager.fireConnectionClosed(throwable);
 332                 }
 333         }
 334
 335         //
 336         // PRIVATE METHODS
 337         //
 338
 339         /**
 340          * Incremets the counter in {@link #incomingMessageStatistics} by <cod>1</code>
 341          * for the given message name.
 342          *
 343          * @param name
 344          *            The name of the message to count
 345          */
 346         private void countMessage(String name) {
 347                 int oldValue = 0;
 348                 if (incomingMessageStatistics.containsKey(name)) {
 349                         oldValue = incomingMessageStatistics.get(name);
 350                 }
 351                 incomingMessageStatistics.put(name, oldValue + 1);
 352                 logger.finest("count for " + name + ": " + (oldValue + 1));
 353         }
 354
 355         /**
 356          * Returns a limited input stream from the node’s input stream.
 357          *
 358          * @param dataLength
 359          *            The length of the stream
 360          * @return The limited input stream
 361          */
 362         private synchronized LimitedInputStream getInputStream(long dataLength) {
 363                 if (dataLength <= 0) {
 364                         return new LimitedInputStream(null, 0);
 365                 }
 366                 return new LimitedInputStream(remoteInputStream, dataLength);
 367         }
 368
 369         /**
 370          * A wrapper around an {@link InputStream} that only supplies a limit number
 371          * of bytes from the underlying input stream.
 372          *
 373          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 374          */
 375         private static class LimitedInputStream extends FilterInputStream {
 376
 377                 /** The remaining number of bytes that can be read. */
 378                 private long remaining;
 379
 380                 /**
 381                  * Creates a new LimitedInputStream that supplies at most
 382                  * <code>length</code> bytes from the given input stream.
 383                  *
 384                  * @param inputStream
 385                  *            The input stream
 386                  * @param length
 387                  *            The number of bytes to read
 388                  */
 389                 public LimitedInputStream(InputStream inputStream, long length) {
 390                         super(inputStream);
 391                         remaining = length;
 392                 }
 393
 394                 /**
 395                  * @see java.io.FilterInputStream#available()
 396                  */
 397                 @Override
 398                 public synchronized int available() throws IOException {
 399                         if (remaining == 0) {
 400                                 return 0;
 401                         }
 402                         return (int) Math.min(super.available(), Math.min(Integer.MAX_VALUE, remaining));
 403                 }
 404
 405                 /**
 406                  * @see java.io.FilterInputStream#read()
 407                  */
 408                 @Override
 409                 public synchronized int read() throws IOException {
 410                         int read = -1;
 411                         if (remaining > 0) {
 412                                 read = super.read();
 413                                 remaining--;
 414                         }
 415                         return read;
 416                 }
 417
 418                 /**
 419                  * @see java.io.FilterInputStream#read(byte[], int, int)
 420                  */
 421                 @Override
 422                 public synchronized int read(byte[] b, int off, int len) throws IOException {
 423                         if (remaining == 0) {
 424                                 return -1;
 425                         }
 426                         int toCopy = (int) Math.min(len, Math.min(remaining, Integer.MAX_VALUE));
 427                         int read = super.read(b, off, toCopy);
 428                         remaining -= read;
 429                         return read;
 430                 }
 431
 432                 /**
 433                  * @see java.io.FilterInputStream#skip(long)
 434                  */
 435                 @Override
 436                 public synchronized long skip(long n) throws IOException {
 437                         if ((n < 0) || (remaining == 0)) {
 438                                 return 0;
 439                         }
 440                         long skipped = super.skip(Math.min(n, remaining));
 441                         remaining -= skipped;
 442                         return skipped;
 443                 }
 444
 445                 /**
 446                  * {@inheritDoc} This method does nothing, as {@link #mark(int)} and
 447                  * {@link #reset()} are not supported.
 448                  *
 449                  * @see java.io.FilterInputStream#mark(int)
 450                  */
 451                 @Override
 452                 public void mark(int readlimit) {
 453                         /* do nothing. */
 454                 }
 455
 456                 /**
 457                  * {@inheritDoc}
 458                  *
 459                  * @see java.io.FilterInputStream#markSupported()
 460                  * @return <code>false</code>
 461                  */
 462                 @Override
 463                 public boolean markSupported() {
 464                         return false;
 465                 }
 466
 467                 /**
 468                  * {@inheritDoc} This method does nothing, as {@link #mark(int)} and
 469                  * {@link #reset()} are not supported.
 470                  *
 471                  * @see java.io.FilterInputStream#reset()
 472                  */
 473                 @Override
 474                 public void reset() throws IOException {
 475                         /* do nothing. */
 476                 }
 477
 478                 /**
 479                  * Consumes the input stream, i.e. read all bytes until the limit is
 480                  * reached.
 481                  *
 482                  * @throws IOException
 483                  *             if an I/O error occurs
 484                  */
 485                 public synchronized void consume() throws IOException {
 486                         while (remaining > 0) {
 487                                 skip(remaining);
 488                         }
 489                 }
 490
 491         }
 492
 493 }