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<h1 class="title">trackerclient.cpp Example File</h1>
<span class="small-subtitle">network/torrent/trackerclient.cpp</span>
<!-- $$$network/torrent/trackerclient.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "bencodeparser.h"</span>
<span class="preprocessor">#include "connectionmanager.h"</span>
<span class="preprocessor">#include "torrentclient.h"</span>
<span class="preprocessor">#include "torrentserver.h"</span>
<span class="preprocessor">#include "trackerclient.h"</span>
<span class="preprocessor">#include <QtCore></span>
TrackerClient<span class="operator">::</span>TrackerClient(TorrentClient <span class="operator">*</span>downloader<span class="operator">,</span> <span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qobject.html">QObject</a></span>(parent)<span class="operator">,</span> torrentDownloader(downloader)
{
length <span class="operator">=</span> <span class="number">0</span>;
requestInterval <span class="operator">=</span> <span class="number">5</span> <span class="operator">*</span> <span class="number">60</span>;
requestIntervalTimer <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
firstTrackerRequest <span class="operator">=</span> <span class="keyword">true</span>;
lastTrackerRequest <span class="operator">=</span> <span class="keyword">false</span>;
firstSeeding <span class="operator">=</span> <span class="keyword">true</span>;
connect(<span class="operator">&</span>http<span class="operator">,</span> SIGNAL(done(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(httpRequestDone(<span class="type">bool</span>)));
}
<span class="type">void</span> TrackerClient<span class="operator">::</span>start(<span class="keyword">const</span> MetaInfo <span class="operator">&</span>info)
{
metaInfo <span class="operator">=</span> info;
<span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(fetchPeerList()));
<span class="keyword">if</span> (metaInfo<span class="operator">.</span>fileForm() <span class="operator">=</span><span class="operator">=</span> MetaInfo<span class="operator">::</span>SingleFileForm) {
length <span class="operator">=</span> metaInfo<span class="operator">.</span>singleFile()<span class="operator">.</span>length;
} <span class="keyword">else</span> {
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>MetaInfoMultiFile<span class="operator">></span> files <span class="operator">=</span> metaInfo<span class="operator">.</span>multiFiles();
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> files<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i)
length <span class="operator">+</span><span class="operator">=</span> files<span class="operator">.</span>at(i)<span class="operator">.</span>length;
}
}
<span class="type">void</span> TrackerClient<span class="operator">::</span>startSeeding()
{
firstSeeding <span class="operator">=</span> <span class="keyword">true</span>;
fetchPeerList();
}
<span class="type">void</span> TrackerClient<span class="operator">::</span>stop()
{
lastTrackerRequest <span class="operator">=</span> <span class="keyword">true</span>;
http<span class="operator">.</span>abort();
fetchPeerList();
}
<span class="type">void</span> TrackerClient<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> requestIntervalTimer) {
<span class="keyword">if</span> (http<span class="operator">.</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qhttp.html">QHttp</a></span><span class="operator">::</span>Unconnected)
fetchPeerList();
} <span class="keyword">else</span> {
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>timerEvent(event);
}
}
<span class="type">void</span> TrackerClient<span class="operator">::</span>fetchPeerList()
{
<span class="comment">// Prepare connection details</span>
<span class="type"><a href="qstring.html">QString</a></span> fullUrl <span class="operator">=</span> metaInfo<span class="operator">.</span>announceUrl();
<span class="type"><a href="qurl.html">QUrl</a></span> url(fullUrl);
<span class="type"><a href="qstring.html">QString</a></span> passkey <span class="operator">=</span> <span class="string">"?"</span>;
<span class="keyword">if</span> (fullUrl<span class="operator">.</span>contains(<span class="string">"?passkey"</span>)) {
passkey <span class="operator">=</span> metaInfo<span class="operator">.</span>announceUrl()<span class="operator">.</span>mid(fullUrl<span class="operator">.</span>indexOf(<span class="string">"?passkey"</span>)<span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>);
passkey <span class="operator">+</span><span class="operator">=</span> <span class="char">'&'</span>;
}
<span class="comment">// Percent encode the hash</span>
<span class="type"><a href="qbytearray.html">QByteArray</a></span> infoHash <span class="operator">=</span> torrentDownloader<span class="operator">-</span><span class="operator">></span>infoHash();
<span class="type"><a href="qstring.html">QString</a></span> encodedSum;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> infoHash<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
encodedSum <span class="operator">+</span><span class="operator">=</span> <span class="char">'%'</span>;
encodedSum <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(infoHash<span class="operator">[</span>i<span class="operator">]</span><span class="operator">,</span> <span class="number">16</span>)<span class="operator">.</span>right(<span class="number">2</span>)<span class="operator">.</span>rightJustified(<span class="number">2</span><span class="operator">,</span> <span class="char">'0'</span>);
}
<span class="type">bool</span> seeding <span class="operator">=</span> (torrentDownloader<span class="operator">-</span><span class="operator">></span>state() <span class="operator">=</span><span class="operator">=</span> TorrentClient<span class="operator">::</span>Seeding);
<span class="type"><a href="qbytearray.html">QByteArray</a></span> query;
query <span class="operator">+</span><span class="operator">=</span> url<span class="operator">.</span>path()<span class="operator">.</span>toLatin1();
query <span class="operator">+</span><span class="operator">=</span> passkey;
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"info_hash="</span> <span class="operator">+</span> encodedSum;
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&peer_id="</span> <span class="operator">+</span> ConnectionManager<span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">></span>clientId();
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&port="</span> <span class="operator">+</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(TorrentServer<span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">></span>serverPort());
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&compact=1"</span>;
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&uploaded="</span> <span class="operator">+</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(torrentDownloader<span class="operator">-</span><span class="operator">></span>uploadedBytes());
<span class="keyword">if</span> (<span class="operator">!</span>firstSeeding) {
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&downloaded=0"</span>;
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&left=0"</span>;
} <span class="keyword">else</span> {
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&downloaded="</span> <span class="operator">+</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(
torrentDownloader<span class="operator">-</span><span class="operator">></span>downloadedBytes());
<span class="type">int</span> left <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a><span class="operator"><</span><span class="type">int</span><span class="operator">></span>(<span class="number">0</span><span class="operator">,</span> metaInfo<span class="operator">.</span>totalSize() <span class="operator">-</span> torrentDownloader<span class="operator">-</span><span class="operator">></span>downloadedBytes());
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&left="</span> <span class="operator">+</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(seeding <span class="operator">?</span> <span class="number">0</span> : left);
}
<span class="keyword">if</span> (seeding <span class="operator">&</span><span class="operator">&</span> firstSeeding) {
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&event=completed"</span>;
firstSeeding <span class="operator">=</span> <span class="keyword">false</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (firstTrackerRequest) {
firstTrackerRequest <span class="operator">=</span> <span class="keyword">false</span>;
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&event=started"</span>;
} <span class="keyword">else</span> <span class="keyword">if</span>(lastTrackerRequest) {
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&event=stopped"</span>;
}
<span class="keyword">if</span> (<span class="operator">!</span>trackerId<span class="operator">.</span>isEmpty())
query <span class="operator">+</span><span class="operator">=</span> <span class="string">"&trackerid="</span> <span class="operator">+</span> trackerId;
http<span class="operator">.</span>setHost(url<span class="operator">.</span>host()<span class="operator">,</span> url<span class="operator">.</span>port() <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span> <span class="operator">?</span> <span class="number">80</span> : url<span class="operator">.</span>port());
<span class="keyword">if</span> (<span class="operator">!</span>url<span class="operator">.</span>userName()<span class="operator">.</span>isEmpty())
http<span class="operator">.</span>setUser(url<span class="operator">.</span>userName()<span class="operator">,</span> url<span class="operator">.</span>password());
http<span class="operator">.</span>get(query);
}
<span class="type">void</span> TrackerClient<span class="operator">::</span>httpRequestDone(<span class="type">bool</span> error)
{
<span class="keyword">if</span> (lastTrackerRequest) {
<span class="keyword">emit</span> stopped();
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (error) {
<span class="keyword">emit</span> connectionError(http<span class="operator">.</span>error());
<span class="keyword">return</span>;
}
<span class="type"><a href="qbytearray.html">QByteArray</a></span> response <span class="operator">=</span> http<span class="operator">.</span>readAll();
http<span class="operator">.</span>abort();
BencodeParser parser;
<span class="keyword">if</span> (<span class="operator">!</span>parser<span class="operator">.</span>parse(response)) {
<a href="qtglobal.html#qWarning">qWarning</a>(<span class="string">"Error parsing bencode response from tracker: %s"</span><span class="operator">,</span>
<a href="qtglobal.html#qPrintable">qPrintable</a>(parser<span class="operator">.</span>errorString()));
http<span class="operator">.</span>abort();
<span class="keyword">return</span>;
}
<span class="type"><a href="qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">></span> dict <span class="operator">=</span> parser<span class="operator">.</span>dictionary();
<span class="keyword">if</span> (dict<span class="operator">.</span>contains(<span class="string">"failure reason"</span>)) {
<span class="comment">// no other items are present</span>
<span class="keyword">emit</span> failure(<span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromUtf8(dict<span class="operator">.</span>value(<span class="string">"failure reason"</span>)<span class="operator">.</span>toByteArray()));
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (dict<span class="operator">.</span>contains(<span class="string">"warning message"</span>)) {
<span class="comment">// continue processing</span>
<span class="keyword">emit</span> warning(<span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromUtf8(dict<span class="operator">.</span>value(<span class="string">"warning message"</span>)<span class="operator">.</span>toByteArray()));
}
<span class="keyword">if</span> (dict<span class="operator">.</span>contains(<span class="string">"tracker id"</span>)) {
<span class="comment">// store it</span>
trackerId <span class="operator">=</span> dict<span class="operator">.</span>value(<span class="string">"tracker id"</span>)<span class="operator">.</span>toByteArray();
}
<span class="keyword">if</span> (dict<span class="operator">.</span>contains(<span class="string">"interval"</span>)) {
<span class="comment">// Mandatory item</span>
<span class="keyword">if</span> (requestIntervalTimer <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
killTimer(requestIntervalTimer);
requestIntervalTimer <span class="operator">=</span> startTimer(dict<span class="operator">.</span>value(<span class="string">"interval"</span>)<span class="operator">.</span>toInt() <span class="operator">*</span> <span class="number">1000</span>);
}
<span class="keyword">if</span> (dict<span class="operator">.</span>contains(<span class="string">"peers"</span>)) {
<span class="comment">// store it</span>
peers<span class="operator">.</span>clear();
<span class="type"><a href="qvariant.html">QVariant</a></span> peerEntry <span class="operator">=</span> dict<span class="operator">.</span>value(<span class="string">"peers"</span>);
<span class="keyword">if</span> (peerEntry<span class="operator">.</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">::</span>List) {
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">></span> peerTmp <span class="operator">=</span> peerEntry<span class="operator">.</span>toList();
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> peerTmp<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
TorrentPeer tmp;
<span class="type"><a href="qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">></span> peer <span class="operator">=</span> qvariant_cast<span class="operator"><</span><span class="type"><a href="qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">></span> <span class="operator">></span>(peerTmp<span class="operator">.</span>at(i));
tmp<span class="operator">.</span>id <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromUtf8(peer<span class="operator">.</span>value(<span class="string">"peer id"</span>)<span class="operator">.</span>toByteArray());
tmp<span class="operator">.</span>address<span class="operator">.</span>setAddress(<span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromUtf8(peer<span class="operator">.</span>value(<span class="string">"ip"</span>)<span class="operator">.</span>toByteArray()));
tmp<span class="operator">.</span>port <span class="operator">=</span> peer<span class="operator">.</span>value(<span class="string">"port"</span>)<span class="operator">.</span>toInt();
peers <span class="operator"><</span><span class="operator"><</span> tmp;
}
} <span class="keyword">else</span> {
<span class="type"><a href="qbytearray.html">QByteArray</a></span> peerTmp <span class="operator">=</span> peerEntry<span class="operator">.</span>toByteArray();
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> peerTmp<span class="operator">.</span>size(); i <span class="operator">+</span><span class="operator">=</span> <span class="number">6</span>) {
TorrentPeer tmp;
<span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span> <span class="operator">*</span>data <span class="operator">=</span> (<span class="type"><a href="qtglobal.html#uchar-typedef">uchar</a></span> <span class="operator">*</span>)peerTmp<span class="operator">.</span>constData() <span class="operator">+</span> i;
tmp<span class="operator">.</span>port <span class="operator">=</span> (<span class="type">int</span>(data<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span>) <span class="operator">+</span> data<span class="operator">[</span><span class="number">5</span><span class="operator">]</span>;
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> ipAddress <span class="operator">=</span> <span class="number">0</span>;
ipAddress <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span>(data<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">24</span>;
ipAddress <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span>(data<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">16</span>;
ipAddress <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span>(data<span class="operator">[</span><span class="number">2</span><span class="operator">]</span>) <span class="operator"><</span><span class="operator"><</span> <span class="number">8</span>;
ipAddress <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span>(data<span class="operator">[</span><span class="number">3</span><span class="operator">]</span>);
tmp<span class="operator">.</span>address<span class="operator">.</span>setAddress(ipAddress);
peers <span class="operator"><</span><span class="operator"><</span> tmp;
}
}
<span class="keyword">emit</span> peerListUpdated(peers);
}
}</pre>
</div>
<!-- @@@network/torrent/trackerclient.cpp -->
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