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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef PEERWIRECLIENT_H
#define PEERWIRECLIENT_H
#include <QBitArray>
#include <QList>
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
class QHostAddress;
class QTimerEvent;
QT_END_NAMESPACE
class TorrentPeer;
struct TorrentBlock
{
inline TorrentBlock(int p, int o, int l)
: pieceIndex(p), offset(o), length(l)
{
}
inline bool operator==(const TorrentBlock &other) const
{
return pieceIndex == other.pieceIndex
&& offset == other.offset
&& length == other.length;
}
int pieceIndex;
int offset;
int length;
};
class PeerWireClient : public QTcpSocket
{
Q_OBJECT
public:
enum PeerWireStateFlag {
ChokingPeer = 0x1,
InterestedInPeer = 0x2,
ChokedByPeer = 0x4,
PeerIsInterested = 0x8
};
Q_DECLARE_FLAGS(PeerWireState, PeerWireStateFlag)
PeerWireClient(const QByteArray &peerId, QObject *parent = 0);
void initialize(const QByteArray &infoHash, int pieceCount);
void setPeer(TorrentPeer *peer);
TorrentPeer *peer() const;
// State
inline PeerWireState peerWireState() const { return pwState; }
QBitArray availablePieces() const;
QList<TorrentBlock> incomingBlocks() const;
// Protocol
void chokePeer();
void unchokePeer();
void sendInterested();
void sendKeepAlive();
void sendNotInterested();
void sendPieceNotification(int piece);
void sendPieceList(const QBitArray &bitField);
void requestBlock(int piece, int offset, int length);
void cancelRequest(int piece, int offset, int length);
void sendBlock(int piece, int offset, const QByteArray &data);
// Rate control
qint64 writeToSocket(qint64 bytes);
qint64 readFromSocket(qint64 bytes);
qint64 downloadSpeed() const;
qint64 uploadSpeed() const;
bool canTransferMore() const;
qint64 bytesAvailable() const { return incomingBuffer.size() + QTcpSocket::bytesAvailable(); }
qint64 socketBytesAvailable() const { return socket.bytesAvailable(); }
qint64 socketBytesToWrite() const { return socket.bytesToWrite(); }
void setReadBufferSize(int size);
signals:
void infoHashReceived(const QByteArray &infoHash);
void readyToTransfer();
void choked();
void unchoked();
void interested();
void notInterested();
void piecesAvailable(const QBitArray &pieces);
void blockRequested(int pieceIndex, int begin, int length);
void blockReceived(int pieceIndex, int begin, const QByteArray &data);
void bytesReceived(qint64 size);
protected slots:
void connectToHostImplementation(const QString &hostName,
quint16 port, OpenMode openMode = ReadWrite);
void diconnectFromHostImplementation();
protected:
void timerEvent(QTimerEvent *event);
qint64 readData(char *data, qint64 maxlen);
qint64 readLineData(char *data, qint64 maxlen);
qint64 writeData(const char *data, qint64 len);
private slots:
void sendHandShake();
void processIncomingData();
void socketStateChanged(QAbstractSocket::SocketState state);
private:
// Data waiting to be read/written
QByteArray incomingBuffer;
QByteArray outgoingBuffer;
struct BlockInfo {
int pieceIndex;
int offset;
int length;
QByteArray block;
};
QList<BlockInfo> pendingBlocks;
int pendingBlockSizes;
QList<TorrentBlock> incoming;
enum PacketType {
ChokePacket = 0,
UnchokePacket = 1,
InterestedPacket = 2,
NotInterestedPacket = 3,
HavePacket = 4,
BitFieldPacket = 5,
RequestPacket = 6,
PiecePacket = 7,
CancelPacket = 8
};
// State
PeerWireState pwState;
bool receivedHandShake;
bool gotPeerId;
bool sentHandShake;
int nextPacketLength;
// Upload/download speed records
qint64 uploadSpeedData[8];
qint64 downloadSpeedData[8];
int transferSpeedTimer;
// Timeout handling
int timeoutTimer;
int pendingRequestTimer;
bool invalidateTimeout;
int keepAliveTimer;
// Checksum, peer ID and set of available pieces
QByteArray infoHash;
QByteArray peerIdString;
QBitArray peerPieces;
TorrentPeer *torrentPeer;
QTcpSocket socket;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(PeerWireClient::PeerWireState)
#endif
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