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# torrentserver.cpp Example File

network/torrent/torrentserver.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 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."
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     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include "connectionmanager.h"
     #include "peerwireclient.h"
     #include "ratecontroller.h"
     #include "torrentclient.h"
     #include "torrentserver.h"

     Q_GLOBAL_STATIC(TorrentServer, torrentServer)

     TorrentServer *TorrentServer::instance()
     {
         return torrentServer();
     }

     void TorrentServer::addClient(TorrentClient *client)
     {
         clients << client;
     }

     void TorrentServer::removeClient(TorrentClient *client)
     {
         clients.removeAll(client);
     }

     void TorrentServer::incomingConnection(int socketDescriptor)
     {
         PeerWireClient *client =
             new PeerWireClient(ConnectionManager::instance()->clientId(), this);

         if (client->setSocketDescriptor(socketDescriptor)) {
             if (ConnectionManager::instance()->canAddConnection() && !clients.isEmpty()) {
                 connect(client, SIGNAL(infoHashReceived(QByteArray)),
                         this, SLOT(processInfoHash(QByteArray)));
                 connect(client, SIGNAL(error(QAbstractSocket::SocketError)),
                         this, SLOT(removeClient()));
                 RateController::instance()->addSocket(client);
                 ConnectionManager::instance()->addConnection(client);
                 return;
             }
         }
         client->abort();
         delete client;
     }

     void TorrentServer::removeClient()
     {
         PeerWireClient *peer = qobject_cast<PeerWireClient *>(sender());
         RateController::instance()->removeSocket(peer);
         ConnectionManager::instance()->removeConnection(peer);
         peer->deleteLater();
     }

     void TorrentServer::processInfoHash(const QByteArray &infoHash)
     {
         PeerWireClient *peer = qobject_cast<PeerWireClient *>(sender());
         foreach (TorrentClient *client, clients) {
             if (client->state() >= TorrentClient::Searching && client->infoHash() == infoHash) {
                 peer->disconnect(peer, 0, this, 0);
                 client->setupIncomingConnection(peer);
                 return;
             }
         }
         removeClient();
     }