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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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 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)
explicit PeerWireClient(const QByteArray &peerId, QObject *parent = nullptr);
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 override { return incomingBuffer.size() + QTcpSocket::bytesAvailable(); }
qint64 socketBytesAvailable() const { return socket.bytesAvailable(); }
qint64 socketBytesToWrite() const { return socket.bytesToWrite(); }
void setReadBufferSize(qint64 size) override;
void connectToHost(const QHostAddress &address,
quint16 port, OpenMode openMode = ReadWrite) override;
void diconnectFromHost();
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:
void timerEvent(QTimerEvent *event) override;
qint64 readData(char *data, qint64 maxlen) override;
qint64 readLineData(char *data, qint64 maxlen) override;
qint64 writeData(const char *data, qint64 len) override;
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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