2 * jFCPlib - FpcConnection.java - Copyright © 2008 David Roden
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 2 of the License, or
7 * (at your option) any later version.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 package net.pterodactylus.fcp;
21 import java.io.Closeable;
22 import java.io.FilterInputStream;
23 import java.io.IOException;
24 import java.io.InputStream;
25 import java.io.OutputStream;
26 import java.net.InetAddress;
27 import java.net.Socket;
28 import java.net.UnknownHostException;
29 import java.util.Collections;
30 import java.util.HashMap;
32 import java.util.logging.Logger;
34 import net.pterodactylus.util.logging.Logging;
37 * An FCP connection to a Freenet node.
39 * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
41 public class FcpConnection implements Closeable {
44 private static final Logger logger = Logging.getLogger(FcpConnection.class.getName());
46 /** The default port for FCP v2. */
47 public static final int DEFAULT_PORT = 9481;
49 /** Listener management. */
50 private final FcpListenerManager fcpListenerManager = new FcpListenerManager(this);
52 /** The address of the node. */
53 private final InetAddress address;
55 /** The port number of the node’s FCP port. */
56 private final int port;
58 /** The remote socket. */
59 private Socket remoteSocket;
61 /** The input stream from the node. */
62 private InputStream remoteInputStream;
64 /** The output stream to the node. */
65 private OutputStream remoteOutputStream;
67 /** The connection handler. */
68 private FcpConnectionHandler connectionHandler;
70 /** Incoming message statistics. */
71 private Map<String, Integer> incomingMessageStatistics = Collections.synchronizedMap(new HashMap<String, Integer>());
74 * Creates a new FCP connection to the freenet node running on localhost,
75 * using the default port.
77 * @throws UnknownHostException
78 * if the hostname can not be resolved
80 public FcpConnection() throws UnknownHostException {
81 this(InetAddress.getLocalHost());
85 * Creates a new FCP connection to the Freenet node running on the given
86 * host, listening on the default port.
89 * The hostname of the Freenet node
90 * @throws UnknownHostException
91 * if <code>host</code> can not be resolved
93 public FcpConnection(String host) throws UnknownHostException {
94 this(host, DEFAULT_PORT);
98 * Creates a new FCP connection to the Freenet node running on the given
99 * host, listening on the given port.
102 * The hostname of the Freenet node
104 * The port number of the node’s FCP port
105 * @throws UnknownHostException
106 * if <code>host</code> can not be resolved
108 public FcpConnection(String host, int port) throws UnknownHostException {
109 this(InetAddress.getByName(host), port);
113 * Creates a new FCP connection to the Freenet node running at the given
114 * address, listening on the default port.
117 * The address of the Freenet node
119 public FcpConnection(InetAddress address) {
120 this(address, DEFAULT_PORT);
124 * Creates a new FCP connection to the Freenet node running at the given
125 * address, listening on the given port.
128 * The address of the Freenet node
130 * The port number of the node’s FCP port
132 public FcpConnection(InetAddress address, int port) {
133 this.address = address;
138 // LISTENER MANAGEMENT
142 * Adds the given listener to the list of listeners.
145 * The listener to add
147 public void addFcpListener(FcpListener fcpListener) {
148 fcpListenerManager.addListener(fcpListener);
152 * Removes the given listener from the list of listeners.
155 * The listener to remove
157 public void removeFcpListener(FcpListener fcpListener) {
158 fcpListenerManager.removeListener(fcpListener);
166 * Connects to the node.
168 * @throws IOException
169 * if an I/O error occurs
170 * @throws IllegalStateException
171 * if there is already a connection to the node
173 public synchronized void connect() throws IOException, IllegalStateException {
174 if (connectionHandler != null) {
175 throw new IllegalStateException("already connected, disconnect first");
177 logger.info("connecting to " + address + ":" + port + "…");
178 remoteSocket = new Socket(address, port);
179 remoteInputStream = remoteSocket.getInputStream();
180 remoteOutputStream = remoteSocket.getOutputStream();
181 new Thread(connectionHandler = new FcpConnectionHandler(this, remoteInputStream)).start();
185 * Disconnects from the node. If there is no connection to the node, this
186 * method does nothing.
188 * @deprecated Use {@link #close()} instead
191 public synchronized void disconnect() {
196 * Closes the connection. If there is no connection to the node, this method
199 public void close() {
200 handleDisconnect(null);
204 * Sends the given FCP message.
207 * The FCP message to send
208 * @throws IOException
209 * if an I/O error occurs
211 public synchronized void sendMessage(FcpMessage fcpMessage) throws IOException {
212 logger.fine("sending message: " + fcpMessage.getName());
213 fcpMessage.write(remoteOutputStream);
217 // PACKAGE-PRIVATE METHODS
221 * Handles the given message, notifying listeners. This message should only
222 * be called by {@link FcpConnectionHandler}.
225 * The received message
227 void handleMessage(FcpMessage fcpMessage) {
228 logger.fine("received message: " + fcpMessage.getName());
229 String messageName = fcpMessage.getName();
230 countMessage(messageName);
231 if ("SimpleProgress".equals(messageName)) {
232 fcpListenerManager.fireReceivedSimpleProgress(new SimpleProgress(fcpMessage));
233 } else if ("ProtocolError".equals(messageName)) {
234 fcpListenerManager.fireReceivedProtocolError(new ProtocolError(fcpMessage));
235 } else if ("PersistentGet".equals(messageName)) {
236 fcpListenerManager.fireReceivedPersistentGet(new PersistentGet(fcpMessage));
237 } else if ("PersistentPut".equals(messageName)) {
238 fcpListenerManager.fireReceivedPersistentPut(new PersistentPut(fcpMessage));
239 } else if ("PersistentPutDir".equals(messageName)) {
240 fcpListenerManager.fireReceivedPersistentPutDir(new PersistentPutDir(fcpMessage));
241 } else if ("URIGenerated".equals(messageName)) {
242 fcpListenerManager.fireReceivedURIGenerated(new URIGenerated(fcpMessage));
243 } else if ("EndListPersistentRequests".equals(messageName)) {
244 fcpListenerManager.fireReceivedEndListPersistentRequests(new EndListPersistentRequests(fcpMessage));
245 } else if ("Peer".equals(messageName)) {
246 fcpListenerManager.fireReceivedPeer(new Peer(fcpMessage));
247 } else if ("PeerNote".equals(messageName)) {
248 fcpListenerManager.fireReceivedPeerNote(new PeerNote(fcpMessage));
249 } else if ("StartedCompression".equals(messageName)) {
250 fcpListenerManager.fireReceivedStartedCompression(new StartedCompression(fcpMessage));
251 } else if ("FinishedCompression".equals(messageName)) {
252 fcpListenerManager.fireReceivedFinishedCompression(new FinishedCompression(fcpMessage));
253 } else if ("GetFailed".equals(messageName)) {
254 fcpListenerManager.fireReceivedGetFailed(new GetFailed(fcpMessage));
255 } else if ("PutFetchable".equals(messageName)) {
256 fcpListenerManager.fireReceivedPutFetchable(new PutFetchable(fcpMessage));
257 } else if ("PutSuccessful".equals(messageName)) {
258 fcpListenerManager.fireReceivedPutSuccessful(new PutSuccessful(fcpMessage));
259 } else if ("PutFailed".equals(messageName)) {
260 fcpListenerManager.fireReceivedPutFailed(new PutFailed(fcpMessage));
261 } else if ("DataFound".equals(messageName)) {
262 fcpListenerManager.fireReceivedDataFound(new DataFound(fcpMessage));
263 } else if ("SubscribedUSKUpdate".equals(messageName)) {
264 fcpListenerManager.fireReceivedSubscribedUSKUpdate(new SubscribedUSKUpdate(fcpMessage));
265 } else if ("IdentifierCollision".equals(messageName)) {
266 fcpListenerManager.fireReceivedIdentifierCollision(new IdentifierCollision(fcpMessage));
267 } else if ("AllData".equals(messageName)) {
268 LimitedInputStream payloadInputStream = getInputStream(FcpUtils.safeParseLong(fcpMessage.getField("DataLength")));
269 fcpListenerManager.fireReceivedAllData(new AllData(fcpMessage, payloadInputStream));
271 payloadInputStream.consume();
272 } catch (IOException ioe1) {
273 /* well, ignore. when the connection handler fails, all fails. */
275 } else if ("EndListPeerNotes".equals(messageName)) {
276 fcpListenerManager.fireReceivedEndListPeerNotes(new EndListPeerNotes(fcpMessage));
277 } else if ("EndListPeers".equals(messageName)) {
278 fcpListenerManager.fireReceivedEndListPeers(new EndListPeers(fcpMessage));
279 } else if ("SSKKeypair".equals(messageName)) {
280 fcpListenerManager.fireReceivedSSKKeypair(new SSKKeypair(fcpMessage));
281 } else if ("PeerRemoved".equals(messageName)) {
282 fcpListenerManager.fireReceivedPeerRemoved(new PeerRemoved(fcpMessage));
283 } else if ("PersistentRequestModified".equals(messageName)) {
284 fcpListenerManager.fireReceivedPersistentRequestModified(new PersistentRequestModified(fcpMessage));
285 } else if ("PersistentRequestRemoved".equals(messageName)) {
286 fcpListenerManager.fireReceivedPersistentRequestRemoved(new PersistentRequestRemoved(fcpMessage));
287 } else if ("UnknownPeerNoteType".equals(messageName)) {
288 fcpListenerManager.fireReceivedUnknownPeerNoteType(new UnknownPeerNoteType(fcpMessage));
289 } else if ("UnknownNodeIdentifier".equals(messageName)) {
290 fcpListenerManager.fireReceivedUnknownNodeIdentifier(new UnknownNodeIdentifier(fcpMessage));
291 } else if ("FCPPluginReply".equals(messageName)) {
292 LimitedInputStream payloadInputStream = getInputStream(FcpUtils.safeParseLong(fcpMessage.getField("DataLength")));
293 fcpListenerManager.fireReceivedFCPPluginReply(new FCPPluginReply(fcpMessage, payloadInputStream));
295 payloadInputStream.consume();
296 } catch (IOException ioe1) {
299 } else if ("PluginInfo".equals(messageName)) {
300 fcpListenerManager.fireReceivedPluginInfo(new PluginInfo(fcpMessage));
301 } else if ("NodeData".equals(messageName)) {
302 fcpListenerManager.fireReceivedNodeData(new NodeData(fcpMessage));
303 } else if ("TestDDAReply".equals(messageName)) {
304 fcpListenerManager.fireReceivedTestDDAReply(new TestDDAReply(fcpMessage));
305 } else if ("TestDDAComplete".equals(messageName)) {
306 fcpListenerManager.fireReceivedTestDDAComplete(new TestDDAComplete(fcpMessage));
307 } else if ("ConfigData".equals(messageName)) {
308 fcpListenerManager.fireReceivedConfigData(new ConfigData(fcpMessage));
309 } else if ("NodeHello".equals(messageName)) {
310 fcpListenerManager.fireReceivedNodeHello(new NodeHello(fcpMessage));
311 } else if ("CloseConnectionDuplicateClientName".equals(messageName)) {
312 fcpListenerManager.fireReceivedCloseConnectionDuplicateClientName(new CloseConnectionDuplicateClientName(fcpMessage));
313 } else if ("SentFeed".equals(messageName)) {
314 fcpListenerManager.fireSentFeed(new SentFeed(fcpMessage));
315 } else if ("ReceivedBookmarkFeed".equals(messageName)) {
316 fcpListenerManager.fireReceivedBookmarkFeed(new ReceivedBookmarkFeed(fcpMessage));
318 fcpListenerManager.fireMessageReceived(fcpMessage);
323 * Handles a disconnect from the node.
326 * The exception that caused the disconnect, or <code>null</code>
327 * if there was no exception
329 synchronized void handleDisconnect(Throwable throwable) {
330 FcpUtils.close(remoteInputStream);
331 FcpUtils.close(remoteOutputStream);
332 FcpUtils.close(remoteSocket);
333 if (connectionHandler != null) {
334 connectionHandler.stop();
335 connectionHandler = null;
336 fcpListenerManager.fireConnectionClosed(throwable);
345 * Incremets the counter in {@link #incomingMessageStatistics} by
346 * <cod>1</code> for the given message name.
349 * The name of the message to count
351 private void countMessage(String name) {
353 if (incomingMessageStatistics.containsKey(name)) {
354 oldValue = incomingMessageStatistics.get(name);
356 incomingMessageStatistics.put(name, oldValue + 1);
357 logger.finest("count for " + name + ": " + (oldValue + 1));
361 * Returns a limited input stream from the node’s input stream.
364 * The length of the stream
365 * @return The limited input stream
367 private synchronized LimitedInputStream getInputStream(long dataLength) {
368 if (dataLength <= 0) {
369 return new LimitedInputStream(null, 0);
371 return new LimitedInputStream(remoteInputStream, dataLength);
375 * A wrapper around an {@link InputStream} that only supplies a limit number
376 * of bytes from the underlying input stream.
378 * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
380 private static class LimitedInputStream extends FilterInputStream {
382 /** The remaining number of bytes that can be read. */
383 private long remaining;
386 * Creates a new LimitedInputStream that supplies at most
387 * <code>length</code> bytes from the given input stream.
392 * The number of bytes to read
394 public LimitedInputStream(InputStream inputStream, long length) {
400 * @see java.io.FilterInputStream#available()
403 public synchronized int available() throws IOException {
404 if (remaining == 0) {
407 return (int) Math.min(super.available(), Math.min(Integer.MAX_VALUE, remaining));
411 * @see java.io.FilterInputStream#read()
414 public synchronized int read() throws IOException {
424 * @see java.io.FilterInputStream#read(byte[], int, int)
427 public synchronized int read(byte[] b, int off, int len) throws IOException {
428 if (remaining == 0) {
431 int toCopy = (int) Math.min(len, Math.min(remaining, Integer.MAX_VALUE));
432 int read = super.read(b, off, toCopy);
438 * @see java.io.FilterInputStream#skip(long)
441 public synchronized long skip(long n) throws IOException {
442 if ((n < 0) || (remaining == 0)) {
445 long skipped = super.skip(Math.min(n, remaining));
446 remaining -= skipped;
451 * {@inheritDoc} This method does nothing, as {@link #mark(int)} and
452 * {@link #reset()} are not supported.
454 * @see java.io.FilterInputStream#mark(int)
457 public void mark(int readlimit) {
464 * @see java.io.FilterInputStream#markSupported()
465 * @return <code>false</code>
468 public boolean markSupported() {
473 * {@inheritDoc} This method does nothing, as {@link #mark(int)} and
474 * {@link #reset()} are not supported.
476 * @see java.io.FilterInputStream#reset()
479 public void reset() throws IOException {
484 * Consumes the input stream, i.e. read all bytes until the limit is
487 * @throws IOException
488 * if an I/O error occurs
490 public synchronized void consume() throws IOException {
491 while (remaining > 0) {