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#include "bencodeparser.h"
#include "connectionmanager.h"
#include "torrentclient.h"
#include "torrentserver.h"
#include "trackerclient.h"
#include <QtCore>
TrackerClient::TrackerClient(TorrentClient *downloader, QObject *parent)
: QObject(parent), torrentDownloader(downloader)
{
length = 0;
requestInterval = 5 * 60;
requestIntervalTimer = -1;
firstTrackerRequest = true;
lastTrackerRequest = false;
firstSeeding = true;
connect(&http, SIGNAL(done(bool)), this, SLOT(httpRequestDone(bool)));
}
void TrackerClient::start(const MetaInfo &info)
{
metaInfo = info;
QTimer::singleShot(0, this, SLOT(fetchPeerList()));
if (metaInfo.fileForm() == MetaInfo::SingleFileForm) {
length = metaInfo.singleFile().length;
} else {
QList<MetaInfoMultiFile> files = metaInfo.multiFiles();
for (int i = 0; i < files.size(); ++i)
length += files.at(i).length;
}
}
void TrackerClient::startSeeding()
{
firstSeeding = true;
fetchPeerList();
}
void TrackerClient::stop()
{
lastTrackerRequest = true;
http.abort();
fetchPeerList();
}
void TrackerClient::timerEvent(QTimerEvent *event)
{
if (event->timerId() == requestIntervalTimer) {
if (http.state() == QHttp::Unconnected)
fetchPeerList();
} else {
QObject::timerEvent(event);
}
}
void TrackerClient::fetchPeerList()
{
<span class="comment">// Prepare connection details</span>
QString fullUrl = metaInfo.announceUrl();
QUrl url(fullUrl);
QString passkey = "?";
if (fullUrl.contains("?passkey")) {
passkey = metaInfo.announceUrl().mid(fullUrl.indexOf("?passkey"), -1);
passkey += '&';
}
<span class="comment">// Percent encode the hash</span>
QByteArray infoHash = torrentDownloader->infoHash();
QString encodedSum;
for (int i = 0; i < infoHash.size(); ++i) {
encodedSum += '%';
encodedSum += QString::number(infoHash[i], 16).right(2).rightJustified(2, '0');
}
bool seeding = (torrentDownloader->state() == TorrentClient::Seeding);
QByteArray query;
query += url.path().toLatin1();
query += passkey;
query += "info_hash=" + encodedSum;
query += "&peer_id=" + ConnectionManager::instance()->clientId();
query += "&port=" + QByteArray::number(TorrentServer::instance()->serverPort());
query += "&compact=1";
query += "&uploaded=" + QByteArray::number(torrentDownloader->uploadedBytes());
if (!firstSeeding) {
query += "&downloaded=0";
query += "&left=0";
} else {
query += "&downloaded=" + QByteArray::number(
torrentDownloader->downloadedBytes());
int left = qMax<int>(0, metaInfo.totalSize() - torrentDownloader->downloadedBytes());
query += "&left=" + QByteArray::number(seeding ? 0 : left);
}
if (seeding && firstSeeding) {
query += "&event=completed";
firstSeeding = false;
} else if (firstTrackerRequest) {
firstTrackerRequest = false;
query += "&event=started";
} else if(lastTrackerRequest) {
query += "&event=stopped";
}
if (!trackerId.isEmpty())
query += "&trackerid=" + trackerId;
http.setHost(url.host(), url.port() == -1 ? 80 : url.port());
if (!url.userName().isEmpty())
http.setUser(url.userName(), url.password());
http.get(query);
}
void TrackerClient::httpRequestDone(bool error)
{
if (lastTrackerRequest) {
emit stopped();
return;
}
if (error) {
emit connectionError(http.error());
return;
}
QByteArray response = http.readAll();
http.abort();
BencodeParser parser;
if (!parser.parse(response)) {
qWarning("Error parsing bencode response from tracker: %s",
qPrintable(parser.errorString()));
http.abort();
return;
}
QMap<QByteArray, QVariant> dict = parser.dictionary();
if (dict.contains("failure reason")) {
<span class="comment">// no other items are present</span>
emit failure(QString::fromUtf8(dict.value("failure reason").toByteArray()));
return;
}
if (dict.contains("warning message")) {
<span class="comment">// continue processing</span>
emit warning(QString::fromUtf8(dict.value("warning message").toByteArray()));
}
if (dict.contains("tracker id")) {
<span class="comment">// store it</span>
trackerId = dict.value("tracker id").toByteArray();
}
if (dict.contains("interval")) {
<span class="comment">// Mandatory item</span>
if (requestIntervalTimer != -1)
killTimer(requestIntervalTimer);
requestIntervalTimer = startTimer(dict.value("interval").toInt() * 1000);
}
if (dict.contains("peers")) {
<span class="comment">// store it</span>
peers.clear();
QVariant peerEntry = dict.value("peers");
if (peerEntry.type() == QVariant::List) {
QList<QVariant> peerTmp = peerEntry.toList();
for (int i = 0; i < peerTmp.size(); ++i) {
TorrentPeer tmp;
QMap<QByteArray, QVariant> peer = qVariantValue<QMap<QByteArray, QVariant> >(peerTmp.at(i));
tmp.id = QString::fromUtf8(peer.value("peer id").toByteArray());
tmp.address.setAddress(QString::fromUtf8(peer.value("ip").toByteArray()));
tmp.port = peer.value("port").toInt();
peers << tmp;
}
} else {
QByteArray peerTmp = peerEntry.toByteArray();
for (int i = 0; i < peerTmp.size(); i += 6) {
TorrentPeer tmp;
uchar *data = (uchar *)peerTmp.constData() + i;
tmp.port = (int(data[4]) << 8) + data[5];
uint ipAddress = 0;
ipAddress += uint(data[0]) << 24;
ipAddress += uint(data[1]) << 16;
ipAddress += uint(data[2]) << 8;
ipAddress += uint(data[3]);
tmp.address.setAddress(ipAddress);
peers << tmp;
}
}
emit peerListUpdated(peers);
}
}</pre>
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