torrentclient.h Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** 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 Nokia Corporation 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."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #ifndef TORRENTCLIENT_H
 #define TORRENTCLIENT_H

 #include <QBitArray>
 #include <QHostAddress>
 #include <QList>

 class MetaInfo;
 class PeerWireClient;
 class TorrentClientPrivate;
 class TorrentPeer;
 class TorrentPiece;
 class QTimerEvent;

 class TorrentPeer {
 public:
     QHostAddress address;
     quint16 port;
     QString id;
     bool interesting;
     bool seed;
     uint lastVisited;
     uint connectStart;
     uint connectTime;
     QBitArray pieces;
     int numCompletedPieces;

     inline bool operator==(const TorrentPeer &other)
     {
         return port == other.port
             && address == other.address
             && id == other.id;
     }
 };

 class TorrentClient : public QObject
 {
     Q_OBJECT

 public:
     enum State {
         Idle,
         Paused,
         Stopping,
         Preparing,
         Searching,
         Connecting,
         WarmingUp,
         Downloading,
         Endgame,
         Seeding
     };
     enum Error {
         UnknownError,
         TorrentParseError,
         InvalidTrackerError,
         FileError,
         ServerError
     };

     TorrentClient(QObject *parent = 0);
     ~TorrentClient();

     bool setTorrent(const QString &fileName);
     bool setTorrent(const QByteArray &torrentData);
     MetaInfo metaInfo() const;

     void setMaxConnections(int connections);
     int maxConnections() const;

     void setDestinationFolder(const QString &directory);
     QString destinationFolder() const;

     void setDumpedState(const QByteArray &dumpedState);
     QByteArray dumpedState() const;

     // Progress and stats for download feedback.
     qint64 progress() const;
     void setDownloadedBytes(qint64 bytes);
     qint64 downloadedBytes() const;
     void setUploadedBytes(qint64 bytes);
     qint64 uploadedBytes() const;
     int connectedPeerCount() const;
     int seedCount() const;

     // Accessors for the tracker
     QByteArray peerId() const;
     QByteArray infoHash() const;
     quint16 serverPort() const;

     // State and error.
     State state() const;
     QString stateString() const;
     Error error() const;
     QString errorString() const;

 signals:
     void stateChanged(TorrentClient::State state);
     void error(TorrentClient::Error error);

     void downloadCompleted();
     void peerInfoUpdated();

     void dataSent(int uploadedBytes);
     void dataReceived(int downloadedBytes);
     void progressUpdated(int percentProgress);
     void downloadRateUpdated(int bytesPerSecond);
     void uploadRateUpdated(int bytesPerSecond);

     void stopped();

 public slots:
     void start();
     void stop();
     void setPaused(bool paused);
     void setupIncomingConnection(PeerWireClient *client);

 protected slots:
     void timerEvent(QTimerEvent *event);

 private slots:
     // File management
     void sendToPeer(int readId, int pieceIndex, int begin, const QByteArray &data);
     void fullVerificationDone();
     void pieceVerified(int pieceIndex, bool ok);
     void handleFileError();

     // Connection handling
     void connectToPeers();
     QList<TorrentPeer *> weighedFreePeers() const;
     void setupOutgoingConnection();
     void initializeConnection(PeerWireClient *client);
     void removeClient();
     void peerPiecesAvailable(const QBitArray &pieces);
     void peerRequestsBlock(int pieceIndex, int begin, int length);
     void blockReceived(int pieceIndex, int begin, const QByteArray &data);
     void peerWireBytesWritten(qint64 bytes);
     void peerWireBytesReceived(qint64 bytes);
     int blocksLeftForPiece(const TorrentPiece *piece) const;

     // Scheduling
     void scheduleUploads();
     void scheduleDownloads();
     void schedulePieceForClient(PeerWireClient *client);
     void requestMore(PeerWireClient *client);
     int requestBlocks(PeerWireClient *client, TorrentPiece *piece, int maxBlocks);
     void peerChoked();
     void peerUnchoked();

     // Tracker handling
     void addToPeerList(const QList<TorrentPeer> &peerList);
     void trackerStopped();

     // Progress
     void updateProgress(int progress = -1);

 private:
     TorrentClientPrivate *d;
     friend class TorrentClientPrivate;
 };

 #endif