src/net/pterodactylus/util/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.util.fcp;
  21
  22 import java.io.IOException;
  23 import java.io.InputStream;
  24 import java.io.OutputStream;
  25 import java.net.InetAddress;
  26 import java.net.Socket;
  27 import java.net.UnknownHostException;
  28 import java.util.ArrayList;
  29 import java.util.List;
  30
  31 import net.pterodactylus.util.io.Closer;
  32
  33 /**
  34  * An FCP connection to a Freenet node.
  35  *
  36  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  37  * @version $Id$
  38  */
  39 public class FcpConnection {
  40
  41         /** The default port for FCP v2. */
  42         public static final int DEFAULT_PORT = 9481;
  43
  44         /** The list of FCP listeners. */
  45         private final List<FcpListener> fcpListeners = new ArrayList<FcpListener>();
  46
  47         /** The address of the node. */
  48         private final InetAddress address;
  49
  50         /** The port number of the node’s FCP port. */
  51         private final int port;
  52
  53         /** The remote socket. */
  54         private Socket remoteSocket;
  55
  56         /** The input stream from the node. */
  57         private InputStream remoteInputStream;
  58
  59         /** The output stream to the node. */
  60         private OutputStream remoteOutputStream;
  61
  62         /** The connection handler. */
  63         private FcpConnectionHandler connectionHandler;
  64
  65         /**
  66          * Creates a new FCP connection to the Freenet node running on the given
  67          * host, listening on the default port.
  68          *
  69          * @param host
  70          *            The hostname of the Freenet node
  71          * @throws UnknownHostException
  72          *             if <code>host</code> can not be resolved
  73          */
  74         public FcpConnection(String host) throws UnknownHostException {
  75                 this(host, DEFAULT_PORT);
  76         }
  77
  78         /**
  79          * Creates a new FCP connection to the Freenet node running on the given
  80          * host, listening on the given port.
  81          *
  82          * @param host
  83          *            The hostname of the Freenet node
  84          * @param port
  85          *            The port number of the node’s FCP port
  86          * @throws UnknownHostException
  87          *             if <code>host</code> can not be resolved
  88          */
  89         public FcpConnection(String host, int port) throws UnknownHostException {
  90                 this(InetAddress.getByName(host), port);
  91         }
  92
  93         /**
  94          * Creates a new FCP connection to the Freenet node running at the given
  95          * address, listening on the default port.
  96          *
  97          * @param address
  98          *            The address of the Freenet node
  99          */
 100         public FcpConnection(InetAddress address) {
 101                 this(address, DEFAULT_PORT);
 102         }
 103
 104         /**
 105          * Creates a new FCP connection to the Freenet node running at the given
 106          * address, listening on the given port.
 107          *
 108          * @param address
 109          *            The address of the Freenet node
 110          * @param port
 111          *            The port number of the node’s FCP port
 112          */
 113         public FcpConnection(InetAddress address, int port) {
 114                 this.address = address;
 115                 this.port = port;
 116         }
 117
 118         //
 119         // LISTENER MANAGEMENT
 120         //
 121
 122         /**
 123          * Adds the given listener to the list of listeners.
 124          *
 125          * @param fcpListener
 126          *            The listener to add
 127          */
 128         public void addFcpListener(FcpListener fcpListener) {
 129                 fcpListeners.add(fcpListener);
 130         }
 131
 132         /**
 133          * Removes the given listener from the list of listeners.
 134          *
 135          * @param fcpListener
 136          *            The listener to remove
 137          */
 138         public void removeFcpListener(FcpListener fcpListener) {
 139                 fcpListeners.remove(fcpListener);
 140         }
 141
 142         /**
 143          * Notifies listeners that a “NodeHello” message was received.
 144          *
 145          * @see FcpListener#receivedNodeHello(FcpConnection, NodeHello)
 146          * @param nodeHello
 147          *            The “NodeHello” message
 148          */
 149         private void fireReceivedNodeHello(NodeHello nodeHello) {
 150                 for (FcpListener fcpListener: fcpListeners) {
 151                         fcpListener.receivedNodeHello(this, nodeHello);
 152                 }
 153         }
 154
 155         /**
 156          * Notifies listeners that a “CloseConnectionDuplicateClientName” message
 157          * was received.
 158          *
 159          * @see FcpListener#receivedCloseConnectionDuplicateClientName(FcpConnection,
 160          *      CloseConnectionDuplicateClientName)
 161          * @param closeConnectionDuplicateClientName
 162          *            The “CloseConnectionDuplicateClientName” message
 163          */
 164         private void fireReceivedCloseConnectionDuplicateClientName(CloseConnectionDuplicateClientName closeConnectionDuplicateClientName) {
 165                 for (FcpListener fcpListener: fcpListeners) {
 166                         fcpListener.receivedCloseConnectionDuplicateClientName(this, closeConnectionDuplicateClientName);
 167                 }
 168         }
 169
 170         /**
 171          * Notifies listeners that a “SSKKeypair” message was received.
 172          *
 173          * @see FcpListener#receivedSSKKeypair(FcpConnection, SSKKeypair)
 174          * @param sskKeypair
 175          *            The “SSKKeypair” message
 176          */
 177         private void fireReceivedSSKKeypair(SSKKeypair sskKeypair) {
 178                 for (FcpListener fcpListener: fcpListeners) {
 179                         fcpListener.receivedSSKKeypair(this, sskKeypair);
 180                 }
 181         }
 182
 183         /**
 184          * Notifies listeners that a “Peer” message was received.
 185          *
 186          * @see FcpListener#receivedPeer(FcpConnection, Peer)
 187          * @param peer
 188          *            The “Peer” message
 189          */
 190         private void fireReceivedPeer(Peer peer) {
 191                 for (FcpListener fcpListener: fcpListeners) {
 192                         fcpListener.receivedPeer(this, peer);
 193                 }
 194         }
 195
 196         /**
 197          * Notifies all listeners that an “EndListPeers” message was received.
 198          *
 199          * @see FcpListener#receivedEndListPeers(FcpConnection, EndListPeers)
 200          * @param endListPeers
 201          *            The “EndListPeers” message
 202          */
 203         private void fireReceivedEndListPeers(EndListPeers endListPeers) {
 204                 for (FcpListener fcpListener: fcpListeners) {
 205                         fcpListener.receivedEndListPeers(this, endListPeers);
 206                 }
 207         }
 208
 209         /**
 210          * Notifies all listeners that a “PeerNote” message was received.
 211          *
 212          * @see FcpListener#receviedPeerNote(FcpConnection, PeerNote)
 213          * @param peerNote
 214          */
 215         private void fireReceivedPeerNote(PeerNote peerNote) {
 216                 for (FcpListener fcpListener: fcpListeners) {
 217                         fcpListener.receviedPeerNote(this, peerNote);
 218                 }
 219         }
 220
 221         /**
 222          * Notifies all listeners that an “EndListPeerNotes” message was received.
 223          *
 224          * @see FcpListener#receivedEndListPeerNotes(FcpConnection,
 225          *      EndListPeerNotes)
 226          * @param endListPeerNotes
 227          *            The “EndListPeerNotes” message
 228          */
 229         private void fireReceivedEndListPeerNotes(EndListPeerNotes endListPeerNotes) {
 230                 for (FcpListener fcpListener: fcpListeners) {
 231                         fcpListener.receivedEndListPeerNotes(this, endListPeerNotes);
 232                 }
 233         }
 234
 235         /**
 236          * Notifies all listeners that a “PeerRemoved” message was received.
 237          *
 238          * @see FcpListener#receviedPeerRemoved(FcpConnection, PeerRemoved)
 239          * @param peerRemoved
 240          *            The “PeerRemoved” message
 241          */
 242         private void fireReceivedPeerRemoved(PeerRemoved peerRemoved) {
 243                 for (FcpListener fcpListener: fcpListeners) {
 244                         fcpListener.receviedPeerRemoved(this, peerRemoved);
 245                 }
 246         }
 247
 248         /**
 249          * Notifies all registered listeners that a message has been received.
 250          *
 251          * @see FcpListener#receivedMessage(FcpConnection, FcpMessage)
 252          * @param fcpMessage
 253          *            The message that was received
 254          */
 255         private void fireMessageReceived(FcpMessage fcpMessage) {
 256                 for (FcpListener fcpListener: fcpListeners) {
 257                         fcpListener.receivedMessage(this, fcpMessage);
 258                 }
 259         }
 260
 261         //
 262         // ACTIONS
 263         //
 264
 265         /**
 266          * Connects to the node.
 267          *
 268          * @throws IOException
 269          *             if an I/O error occurs
 270          * @throws IllegalStateException
 271          *             if there is already a connection to the node
 272          */
 273         public synchronized void connect() throws IOException, IllegalStateException {
 274                 if (connectionHandler != null) {
 275                         throw new IllegalStateException("already connected, disconnect first");
 276                 }
 277                 remoteSocket = new Socket(address, port);
 278                 remoteInputStream = remoteSocket.getInputStream();
 279                 remoteOutputStream = remoteSocket.getOutputStream();
 280                 new Thread(connectionHandler = new FcpConnectionHandler(this, remoteInputStream)).start();
 281         }
 282
 283         /**
 284          * Disconnects from the node. If there is no connection to the node, this
 285          * method does nothing.
 286          */
 287         public synchronized void disconnect() {
 288                 if (connectionHandler == null) {
 289                         return;
 290                 }
 291                 Closer.close(remoteSocket);
 292                 connectionHandler.stop();
 293                 connectionHandler = null;
 294         }
 295
 296         /**
 297          * Sends the given FCP message.
 298          *
 299          * @param fcpMessage
 300          *            The FCP message to send
 301          * @throws IOException
 302          *             if an I/O error occurs
 303          */
 304         public synchronized void sendMessage(FcpMessage fcpMessage) throws IOException {
 305                 System.out.println("sending message: " + fcpMessage.getName());
 306                 fcpMessage.write(remoteOutputStream);
 307         }
 308
 309         //
 310         // PACKAGE-PRIVATE METHODS
 311         //
 312
 313         /**
 314          * Handles the given message, notifying listeners. This message should only
 315          * be called by {@link FcpConnectionHandler}.
 316          *
 317          * @param fcpMessage
 318          *            The received message
 319          */
 320         void handleMessage(FcpMessage fcpMessage) {
 321                 String messageName = fcpMessage.getName();
 322                 if ("Peer".equals(messageName)) {
 323                         fireReceivedPeer(new Peer(fcpMessage));
 324                 } else if ("PeerNote".equals(messageName)) {
 325                         fireReceivedPeerNote(new PeerNote(fcpMessage));
 326                 } else if ("EndListPeerNotes".equals(messageName)) {
 327                         fireReceivedEndListPeerNotes(new EndListPeerNotes(fcpMessage));
 328                 } else if ("EndListPeers".equals(messageName)) {
 329                         fireReceivedEndListPeers(new EndListPeers(fcpMessage));
 330                 } else if ("SSKKeypair".equals(messageName)) {
 331                         fireReceivedSSKKeypair(new SSKKeypair(fcpMessage));
 332                 } else if ("PeerRemoved".equals(messageName)) {
 333                         fireReceivedPeerRemoved(new PeerRemoved(fcpMessage));
 334                 } else if ("NodeHello".equals(messageName)) {
 335                         fireReceivedNodeHello(new NodeHello(fcpMessage));
 336                 } else if ("CloseConnectionDuplicateClientName".equals(messageName)) {
 337                         fireReceivedCloseConnectionDuplicateClientName(new CloseConnectionDuplicateClientName(fcpMessage));
 338                 } else {
 339                         fireMessageReceived(fcpMessage);
 340                 }
 341         }
 342
 343 }