cd46a2daf5
Update files using old header.LGPL3 to header.LGPL Update files using old FDL template to use new one Update files using old BSD template to use new one Change-Id: I36a78272516f9953d02956522f285b40adfc8915 Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
1540 lines
51 KiB
C++
1540 lines
51 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "connectionmanager.h"
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#include "filemanager.h"
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#include "metainfo.h"
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#include "torrentclient.h"
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#include "torrentserver.h"
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#include "trackerclient.h"
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#include "peerwireclient.h"
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#include "ratecontroller.h"
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#include <QtCore>
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#include <QNetworkInterface>
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#include <algorithm>
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// These constants could also be configurable by the user.
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static const int ServerMinPort = 6881;
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static const int ServerMaxPort = /* 6889 */ 7000;
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static const int BlockSize = 16384;
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static const int MaxBlocksInProgress = 5;
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static const int MaxBlocksInMultiMode = 2;
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static const int MaxConnectionPerPeer = 1;
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static const int RateControlWindowLength = 10;
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static const int RateControlTimerDelay = 1000;
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static const int MinimumTimeBeforeRevisit = 30;
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static const int MaxUploads = 4;
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static const int UploadScheduleInterval = 10000;
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class TorrentPiece {
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public:
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int index;
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int length;
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QBitArray completedBlocks;
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QBitArray requestedBlocks;
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bool inProgress;
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};
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class TorrentClientPrivate
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{
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public:
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TorrentClientPrivate(TorrentClient *qq);
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// State / error
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void setError(TorrentClient::Error error);
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void setState(TorrentClient::State state);
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TorrentClient::Error error;
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TorrentClient::State state;
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QString errorString;
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QString stateString;
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// Where to save data
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QString destinationFolder;
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MetaInfo metaInfo;
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// Announce tracker and file manager
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QByteArray peerId;
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QByteArray infoHash;
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TrackerClient trackerClient;
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FileManager fileManager;
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// Connections
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QList<PeerWireClient *> connections;
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QList<TorrentPeer *> peers;
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bool schedulerCalled;
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void callScheduler();
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bool connectingToClients;
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void callPeerConnector();
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int uploadScheduleTimer;
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// Pieces
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QMap<int, PeerWireClient *> readIds;
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QMultiMap<PeerWireClient *, TorrentPiece *> payloads;
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QMap<int, TorrentPiece *> pendingPieces;
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QBitArray completedPieces;
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QBitArray incompletePieces;
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int pieceCount;
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// Progress
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int lastProgressValue;
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qint64 downloadedBytes;
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qint64 uploadedBytes;
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int downloadRate[RateControlWindowLength];
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int uploadRate[RateControlWindowLength];
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int transferRateTimer;
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TorrentClient *q;
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};
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TorrentClientPrivate::TorrentClientPrivate(TorrentClient *qq)
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: trackerClient(qq), q(qq)
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{
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error = TorrentClient::UnknownError;
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state = TorrentClient::Idle;
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errorString = QT_TRANSLATE_NOOP(TorrentClient, "Unknown error");
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Idle");
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schedulerCalled = false;
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connectingToClients = false;
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uploadScheduleTimer = 0;
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lastProgressValue = -1;
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pieceCount = 0;
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downloadedBytes = 0;
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uploadedBytes = 0;
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memset(downloadRate, 0, sizeof(downloadRate));
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memset(uploadRate, 0, sizeof(uploadRate));
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transferRateTimer = 0;
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}
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void TorrentClientPrivate::setError(TorrentClient::Error errorCode)
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{
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this->error = errorCode;
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switch (error) {
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case TorrentClient::UnknownError:
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errorString = QT_TRANSLATE_NOOP(TorrentClient, "Unknown error");
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break;
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case TorrentClient::TorrentParseError:
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errorString = QT_TRANSLATE_NOOP(TorrentClient, "Invalid torrent data");
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break;
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case TorrentClient::InvalidTrackerError:
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errorString = QT_TRANSLATE_NOOP(TorrentClient, "Unable to connect to tracker");
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break;
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case TorrentClient::FileError:
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errorString = QT_TRANSLATE_NOOP(TorrentClient, "File error");
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break;
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case TorrentClient::ServerError:
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errorString = QT_TRANSLATE_NOOP(TorrentClient, "Unable to initialize server");
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break;
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}
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emit q->error(errorCode);
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}
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void TorrentClientPrivate::setState(TorrentClient::State state)
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{
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this->state = state;
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switch (state) {
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case TorrentClient::Idle:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Idle");
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break;
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case TorrentClient::Paused:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Paused");
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break;
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case TorrentClient::Stopping:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Stopping");
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break;
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case TorrentClient::Preparing:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Preparing");
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break;
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case TorrentClient::Searching:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Searching");
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break;
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case TorrentClient::Connecting:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Connecting");
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break;
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case TorrentClient::WarmingUp:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Warming up");
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break;
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case TorrentClient::Downloading:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Downloading");
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break;
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case TorrentClient::Endgame:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Finishing");
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break;
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case TorrentClient::Seeding:
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stateString = QT_TRANSLATE_NOOP(TorrentClient, "Seeding");
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break;
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}
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emit q->stateChanged(state);
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}
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void TorrentClientPrivate::callScheduler()
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{
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if (!schedulerCalled) {
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schedulerCalled = true;
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QMetaObject::invokeMethod(q, "scheduleDownloads", Qt::QueuedConnection);
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}
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}
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void TorrentClientPrivate::callPeerConnector()
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{
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if (!connectingToClients) {
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connectingToClients = true;
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QTimer::singleShot(10000, q, SLOT(connectToPeers()));
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}
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}
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TorrentClient::TorrentClient(QObject *parent)
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: QObject(parent), d(new TorrentClientPrivate(this))
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{
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// Connect the file manager
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connect(&d->fileManager, SIGNAL(dataRead(int,int,int,QByteArray)),
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this, SLOT(sendToPeer(int,int,int,QByteArray)));
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connect(&d->fileManager, SIGNAL(verificationProgress(int)),
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this, SLOT(updateProgress(int)));
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connect(&d->fileManager, SIGNAL(verificationDone()),
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this, SLOT(fullVerificationDone()));
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connect(&d->fileManager, SIGNAL(pieceVerified(int,bool)),
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this, SLOT(pieceVerified(int,bool)));
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connect(&d->fileManager, SIGNAL(error()),
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this, SLOT(handleFileError()));
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// Connect the tracker client
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connect(&d->trackerClient, SIGNAL(peerListUpdated(QList<TorrentPeer>)),
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this, SLOT(addToPeerList(QList<TorrentPeer>)));
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connect(&d->trackerClient, SIGNAL(stopped()),
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this, SIGNAL(stopped()));
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}
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TorrentClient::~TorrentClient()
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{
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qDeleteAll(d->peers);
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qDeleteAll(d->pendingPieces);
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delete d;
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}
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bool TorrentClient::setTorrent(const QString &fileName)
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{
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QFile file(fileName);
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if (!file.open(QIODevice::ReadOnly) || !setTorrent(file.readAll())) {
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d->setError(TorrentParseError);
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return false;
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}
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return true;
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}
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bool TorrentClient::setTorrent(const QByteArray &torrentData)
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{
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if (!d->metaInfo.parse(torrentData)) {
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d->setError(TorrentParseError);
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return false;
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}
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// Calculate SHA1 hash of the "info" section in the torrent
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QByteArray infoValue = d->metaInfo.infoValue();
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d->infoHash = QCryptographicHash::hash(infoValue, QCryptographicHash::Sha1);
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return true;
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}
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MetaInfo TorrentClient::metaInfo() const
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{
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return d->metaInfo;
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}
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void TorrentClient::setDestinationFolder(const QString &directory)
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{
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d->destinationFolder = directory;
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}
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QString TorrentClient::destinationFolder() const
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{
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return d->destinationFolder;
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}
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void TorrentClient::setDumpedState(const QByteArray &dumpedState)
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{
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// Recover partially completed pieces
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QDataStream stream(dumpedState);
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quint16 version = 0;
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stream >> version;
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if (version != 2)
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return;
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stream >> d->completedPieces;
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while (!stream.atEnd()) {
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int index;
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int length;
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QBitArray completed;
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stream >> index >> length >> completed;
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if (stream.status() != QDataStream::Ok) {
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d->completedPieces.clear();
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break;
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}
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TorrentPiece *piece = new TorrentPiece;
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piece->index = index;
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piece->length = length;
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piece->completedBlocks = completed;
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piece->requestedBlocks.resize(completed.size());
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piece->inProgress = false;
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d->pendingPieces[index] = piece;
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}
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}
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QByteArray TorrentClient::dumpedState() const
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{
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QByteArray partials;
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QDataStream stream(&partials, QIODevice::WriteOnly);
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stream << quint16(2);
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stream << d->completedPieces;
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// Save the state of all partially downloaded pieces into a format
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// suitable for storing in settings.
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QMap<int, TorrentPiece *>::ConstIterator it = d->pendingPieces.constBegin();
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while (it != d->pendingPieces.constEnd()) {
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TorrentPiece *piece = it.value();
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if (blocksLeftForPiece(piece) > 0 && blocksLeftForPiece(piece) < piece->completedBlocks.size()) {
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stream << piece->index;
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stream << piece->length;
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stream << piece->completedBlocks;
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}
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++it;
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}
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return partials;
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}
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qint64 TorrentClient::progress() const
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{
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return d->lastProgressValue;
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}
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void TorrentClient::setDownloadedBytes(qint64 bytes)
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{
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d->downloadedBytes = bytes;
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}
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qint64 TorrentClient::downloadedBytes() const
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{
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return d->downloadedBytes;
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}
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void TorrentClient::setUploadedBytes(qint64 bytes)
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{
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d->uploadedBytes = bytes;
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}
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qint64 TorrentClient::uploadedBytes() const
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{
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return d->uploadedBytes;
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}
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int TorrentClient::connectedPeerCount() const
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{
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int tmp = 0;
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foreach (PeerWireClient *client, d->connections) {
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if (client->state() == QAbstractSocket::ConnectedState)
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++tmp;
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}
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return tmp;
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}
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int TorrentClient::seedCount() const
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{
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int tmp = 0;
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foreach (PeerWireClient *client, d->connections) {
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if (client->availablePieces().count(true) == d->pieceCount)
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++tmp;
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}
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return tmp;
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}
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TorrentClient::State TorrentClient::state() const
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{
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return d->state;
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}
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QString TorrentClient::stateString() const
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{
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return d->stateString;
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}
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TorrentClient::Error TorrentClient::error() const
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{
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return d->error;
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}
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QString TorrentClient::errorString() const
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{
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return d->errorString;
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}
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QByteArray TorrentClient::peerId() const
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{
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return d->peerId;
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}
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QByteArray TorrentClient::infoHash() const
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{
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return d->infoHash;
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}
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void TorrentClient::start()
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{
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if (d->state != Idle)
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return;
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TorrentServer::instance()->addClient(this);
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// Initialize the file manager
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d->setState(Preparing);
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d->fileManager.setMetaInfo(d->metaInfo);
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d->fileManager.setDestinationFolder(d->destinationFolder);
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d->fileManager.setCompletedPieces(d->completedPieces);
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d->fileManager.start(QThread::LowestPriority);
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d->fileManager.startDataVerification();
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}
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void TorrentClient::stop()
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{
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if (d->state == Stopping)
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return;
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TorrentServer::instance()->removeClient(this);
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// Update the state
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State oldState = d->state;
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d->setState(Stopping);
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// Stop the timer
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if (d->transferRateTimer) {
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killTimer(d->transferRateTimer);
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d->transferRateTimer = 0;
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}
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// Abort all existing connections
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foreach (PeerWireClient *client, d->connections) {
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RateController::instance()->removeSocket(client);
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ConnectionManager::instance()->removeConnection(client);
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client->abort();
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}
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d->connections.clear();
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// Perhaps stop the tracker
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if (oldState > Preparing) {
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d->trackerClient.stop();
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} else {
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d->setState(Idle);
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emit stopped();
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}
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}
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void TorrentClient::setPaused(bool paused)
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{
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if (paused) {
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// Abort all connections, and set the max number of
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// connections to 0. Keep the list of peers, so we can quickly
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// resume later.
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d->setState(Paused);
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foreach (PeerWireClient *client, d->connections)
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client->abort();
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d->connections.clear();
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TorrentServer::instance()->removeClient(this);
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} else {
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// Restore the max number of connections, and start the peer
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// connector. We should also quickly start receiving incoming
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// connections.
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d->setState(d->completedPieces.count(true) == d->fileManager.pieceCount()
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? Seeding : Searching);
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connectToPeers();
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TorrentServer::instance()->addClient(this);
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}
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}
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void TorrentClient::timerEvent(QTimerEvent *event)
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{
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if (event->timerId() == d->uploadScheduleTimer) {
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// Update the state of who's choked and who's not
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scheduleUploads();
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return;
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}
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if (event->timerId() != d->transferRateTimer) {
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QObject::timerEvent(event);
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return;
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}
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// Calculate average upload/download rate
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qint64 uploadBytesPerSecond = 0;
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qint64 downloadBytesPerSecond = 0;
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for (int i = 0; i < RateControlWindowLength; ++i) {
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uploadBytesPerSecond += d->uploadRate[i];
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downloadBytesPerSecond += d->downloadRate[i];
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}
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uploadBytesPerSecond /= qint64(RateControlWindowLength);
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downloadBytesPerSecond /= qint64(RateControlWindowLength);
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for (int i = RateControlWindowLength - 2; i >= 0; --i) {
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d->uploadRate[i + 1] = d->uploadRate[i];
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d->downloadRate[i + 1] = d->downloadRate[i];
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}
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d->uploadRate[0] = 0;
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d->downloadRate[0] = 0;
|
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emit uploadRateUpdated(int(uploadBytesPerSecond));
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emit downloadRateUpdated(int(downloadBytesPerSecond));
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|
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// Stop the timer if there is no activity.
|
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if (downloadBytesPerSecond == 0 && uploadBytesPerSecond == 0) {
|
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killTimer(d->transferRateTimer);
|
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d->transferRateTimer = 0;
|
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}
|
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}
|
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void TorrentClient::sendToPeer(int readId, int pieceIndex, int begin, const QByteArray &data)
|
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{
|
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// Send the requested block to the peer if the client connection
|
|
// still exists; otherwise do nothing. This slot is called by the
|
|
// file manager after it has read a block of data.
|
|
PeerWireClient *client = d->readIds.value(readId);
|
|
if (client) {
|
|
if ((client->peerWireState() & PeerWireClient::ChokingPeer) == 0)
|
|
client->sendBlock(pieceIndex, begin, data);
|
|
}
|
|
d->readIds.remove(readId);
|
|
}
|
|
|
|
void TorrentClient::fullVerificationDone()
|
|
{
|
|
// Update our list of completed and incomplete pieces.
|
|
d->completedPieces = d->fileManager.completedPieces();
|
|
d->incompletePieces.resize(d->completedPieces.size());
|
|
d->pieceCount = d->completedPieces.size();
|
|
for (int i = 0; i < d->fileManager.pieceCount(); ++i) {
|
|
if (!d->completedPieces.testBit(i))
|
|
d->incompletePieces.setBit(i);
|
|
}
|
|
|
|
updateProgress();
|
|
|
|
// If the checksums show that what the dumped state thought was
|
|
// partial was in fact complete, then we trust the checksums.
|
|
QMap<int, TorrentPiece *>::Iterator it = d->pendingPieces.begin();
|
|
while (it != d->pendingPieces.end()) {
|
|
if (d->completedPieces.testBit(it.key()))
|
|
it = d->pendingPieces.erase(it);
|
|
else
|
|
++it;
|
|
}
|
|
|
|
d->uploadScheduleTimer = startTimer(UploadScheduleInterval);
|
|
|
|
// Start the server
|
|
TorrentServer *server = TorrentServer::instance();
|
|
if (!server->isListening()) {
|
|
// Set up the peer wire server
|
|
for (int i = ServerMinPort; i <= ServerMaxPort; ++i) {
|
|
if (server->listen(QHostAddress::Any, i))
|
|
break;
|
|
}
|
|
if (!server->isListening()) {
|
|
d->setError(ServerError);
|
|
return;
|
|
}
|
|
}
|
|
|
|
d->setState(d->completedPieces.count(true) == d->pieceCount ? Seeding : Searching);
|
|
|
|
// Start the tracker client
|
|
d->trackerClient.start(d->metaInfo);
|
|
}
|
|
|
|
void TorrentClient::pieceVerified(int pieceIndex, bool ok)
|
|
{
|
|
TorrentPiece *piece = d->pendingPieces.value(pieceIndex);
|
|
|
|
// Remove this piece from all payloads
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.begin();
|
|
while (it != d->payloads.end()) {
|
|
if (it.value()->index == pieceIndex)
|
|
it = d->payloads.erase(it);
|
|
else
|
|
++it;
|
|
}
|
|
|
|
if (!ok) {
|
|
// If a piece did not pass the SHA1 check, we'll simply clear
|
|
// its state, and the scheduler will re-request it
|
|
piece->inProgress = false;
|
|
piece->completedBlocks.fill(false);
|
|
piece->requestedBlocks.fill(false);
|
|
d->callScheduler();
|
|
return;
|
|
}
|
|
|
|
// Update the peer list so we know who's still interesting.
|
|
foreach (TorrentPeer *peer, d->peers) {
|
|
if (!peer->interesting)
|
|
continue;
|
|
bool interesting = false;
|
|
for (int i = 0; i < d->pieceCount; ++i) {
|
|
if (peer->pieces.testBit(i) && d->incompletePieces.testBit(i)) {
|
|
interesting = true;
|
|
break;
|
|
}
|
|
}
|
|
peer->interesting = interesting;
|
|
}
|
|
|
|
// Delete the piece and update our structures.
|
|
delete piece;
|
|
d->pendingPieces.remove(pieceIndex);
|
|
d->completedPieces.setBit(pieceIndex);
|
|
d->incompletePieces.clearBit(pieceIndex);
|
|
|
|
// Notify connected peers.
|
|
foreach (PeerWireClient *client, d->connections) {
|
|
if (client->state() == QAbstractSocket::ConnectedState
|
|
&& !client->availablePieces().testBit(pieceIndex)) {
|
|
client->sendPieceNotification(pieceIndex);
|
|
}
|
|
}
|
|
|
|
// Notify the tracker if we've entered Seeding status; otherwise
|
|
// call the scheduler.
|
|
int completed = d->completedPieces.count(true);
|
|
if (completed == d->pieceCount) {
|
|
if (d->state != Seeding) {
|
|
d->setState(Seeding);
|
|
d->trackerClient.startSeeding();
|
|
}
|
|
} else {
|
|
if (completed == 1)
|
|
d->setState(Downloading);
|
|
else if (d->incompletePieces.count(true) < 5 && d->pendingPieces.size() > d->incompletePieces.count(true))
|
|
d->setState(Endgame);
|
|
d->callScheduler();
|
|
}
|
|
|
|
updateProgress();
|
|
}
|
|
|
|
void TorrentClient::handleFileError()
|
|
{
|
|
if (d->state == Paused)
|
|
return;
|
|
setPaused(true);
|
|
emit error(FileError);
|
|
}
|
|
|
|
void TorrentClient::connectToPeers()
|
|
{
|
|
d->connectingToClients = false;
|
|
|
|
if (d->state == Stopping || d->state == Idle || d->state == Paused)
|
|
return;
|
|
|
|
if (d->state == Searching)
|
|
d->setState(Connecting);
|
|
|
|
// Find the list of peers we are not currently connected to, where
|
|
// the more interesting peers are listed more than once.
|
|
QList<TorrentPeer *> weighedPeers = weighedFreePeers();
|
|
|
|
// Start as many connections as we can
|
|
while (!weighedPeers.isEmpty() && ConnectionManager::instance()->canAddConnection()
|
|
&& (qrand() % (ConnectionManager::instance()->maxConnections() / 2))) {
|
|
PeerWireClient *client = new PeerWireClient(ConnectionManager::instance()->clientId(), this);
|
|
RateController::instance()->addSocket(client);
|
|
ConnectionManager::instance()->addConnection(client);
|
|
|
|
initializeConnection(client);
|
|
d->connections << client;
|
|
|
|
// Pick a random peer from the list of weighed peers.
|
|
TorrentPeer *peer = weighedPeers.takeAt(qrand() % weighedPeers.size());
|
|
weighedPeers.removeAll(peer);
|
|
peer->connectStart = QDateTime::currentDateTime().toTime_t();
|
|
peer->lastVisited = peer->connectStart;
|
|
|
|
// Connect to the peer.
|
|
client->setPeer(peer);
|
|
client->connectToHost(peer->address, peer->port);
|
|
}
|
|
}
|
|
|
|
QList<TorrentPeer *> TorrentClient::weighedFreePeers() const
|
|
{
|
|
QList<TorrentPeer *> weighedPeers;
|
|
|
|
// Generate a list of peers that we want to connect to.
|
|
uint now = QDateTime::currentDateTime().toTime_t();
|
|
QList<TorrentPeer *> freePeers;
|
|
QMap<QString, int> connectionsPerPeer;
|
|
foreach (TorrentPeer *peer, d->peers) {
|
|
bool busy = false;
|
|
foreach (PeerWireClient *client, d->connections) {
|
|
if (client->state() == PeerWireClient::ConnectedState
|
|
&& client->peerAddress() == peer->address
|
|
&& client->peerPort() == peer->port) {
|
|
if (++connectionsPerPeer[peer->address.toString()] >= MaxConnectionPerPeer) {
|
|
busy = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!busy && (now - peer->lastVisited) > uint(MinimumTimeBeforeRevisit))
|
|
freePeers << peer;
|
|
}
|
|
|
|
// Nothing to connect to
|
|
if (freePeers.isEmpty())
|
|
return weighedPeers;
|
|
|
|
// Assign points based on connection speed and pieces available.
|
|
QList<QPair<int, TorrentPeer *> > points;
|
|
foreach (TorrentPeer *peer, freePeers) {
|
|
int tmp = 0;
|
|
if (peer->interesting) {
|
|
tmp += peer->numCompletedPieces;
|
|
if (d->state == Seeding)
|
|
tmp = d->pieceCount - tmp;
|
|
if (!peer->connectStart) // An unknown peer is as interesting as a seed
|
|
tmp += d->pieceCount;
|
|
|
|
// 1/5 of the total score for each second below 5 it takes to
|
|
// connect.
|
|
if (peer->connectTime < 5)
|
|
tmp += (d->pieceCount / 10) * (5 - peer->connectTime);
|
|
}
|
|
points << QPair<int, TorrentPeer *>(tmp, peer);
|
|
}
|
|
std::sort(points.begin(), points.end());
|
|
|
|
// Minimize the list so the point difference is never more than 1.
|
|
typedef QPair<int,TorrentPeer*> PointPair;
|
|
QMultiMap<int, TorrentPeer *> pointMap;
|
|
int lowestScore = 0;
|
|
int lastIndex = 0;
|
|
foreach (PointPair point, points) {
|
|
if (point.first > lowestScore) {
|
|
lowestScore = point.first;
|
|
++lastIndex;
|
|
}
|
|
pointMap.insert(lastIndex, point.second);
|
|
}
|
|
|
|
// Now make up a list of peers where the ones with more points are
|
|
// listed many times.
|
|
QMultiMap<int, TorrentPeer *>::ConstIterator it = pointMap.constBegin();
|
|
while (it != pointMap.constEnd()) {
|
|
for (int i = 0; i < it.key() + 1; ++i)
|
|
weighedPeers << it.value();
|
|
++it;
|
|
}
|
|
|
|
return weighedPeers;
|
|
}
|
|
|
|
void TorrentClient::setupIncomingConnection(PeerWireClient *client)
|
|
{
|
|
// Connect signals
|
|
initializeConnection(client);
|
|
|
|
// Initialize this client
|
|
RateController::instance()->addSocket(client);
|
|
d->connections << client;
|
|
|
|
client->initialize(d->infoHash, d->pieceCount);
|
|
client->sendPieceList(d->completedPieces);
|
|
|
|
emit peerInfoUpdated();
|
|
|
|
if (d->state == Searching || d->state == Connecting) {
|
|
int completed = d->completedPieces.count(true);
|
|
if (completed == 0)
|
|
d->setState(WarmingUp);
|
|
else if (d->incompletePieces.count(true) < 5 && d->pendingPieces.size() > d->incompletePieces.count(true))
|
|
d->setState(Endgame);
|
|
}
|
|
|
|
if (d->connections.isEmpty())
|
|
scheduleUploads();
|
|
}
|
|
|
|
void TorrentClient::setupOutgoingConnection()
|
|
{
|
|
PeerWireClient *client = qobject_cast<PeerWireClient *>(sender());
|
|
|
|
// Update connection statistics.
|
|
foreach (TorrentPeer *peer, d->peers) {
|
|
if (peer->port == client->peerPort() && peer->address == client->peerAddress()) {
|
|
peer->connectTime = peer->lastVisited - peer->connectStart;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Send handshake and piece list
|
|
client->initialize(d->infoHash, d->pieceCount);
|
|
client->sendPieceList(d->completedPieces);
|
|
|
|
emit peerInfoUpdated();
|
|
|
|
if (d->state == Searching || d->state == Connecting) {
|
|
int completed = d->completedPieces.count(true);
|
|
if (completed == 0)
|
|
d->setState(WarmingUp);
|
|
else if (d->incompletePieces.count(true) < 5 && d->pendingPieces.size() > d->incompletePieces.count(true))
|
|
d->setState(Endgame);
|
|
}
|
|
}
|
|
|
|
void TorrentClient::initializeConnection(PeerWireClient *client)
|
|
{
|
|
connect(client, SIGNAL(connected()),
|
|
this, SLOT(setupOutgoingConnection()));
|
|
connect(client, SIGNAL(disconnected()),
|
|
this, SLOT(removeClient()));
|
|
connect(client, SIGNAL(error(QAbstractSocket::SocketError)),
|
|
this, SLOT(removeClient()));
|
|
connect(client, SIGNAL(piecesAvailable(QBitArray)),
|
|
this, SLOT(peerPiecesAvailable(QBitArray)));
|
|
connect(client, SIGNAL(blockRequested(int,int,int)),
|
|
this, SLOT(peerRequestsBlock(int,int,int)));
|
|
connect(client, SIGNAL(blockReceived(int,int,QByteArray)),
|
|
this, SLOT(blockReceived(int,int,QByteArray)));
|
|
connect(client, SIGNAL(choked()),
|
|
this, SLOT(peerChoked()));
|
|
connect(client, SIGNAL(unchoked()),
|
|
this, SLOT(peerUnchoked()));
|
|
connect(client, SIGNAL(bytesWritten(qint64)),
|
|
this, SLOT(peerWireBytesWritten(qint64)));
|
|
connect(client, SIGNAL(bytesReceived(qint64)),
|
|
this, SLOT(peerWireBytesReceived(qint64)));
|
|
}
|
|
|
|
void TorrentClient::removeClient()
|
|
{
|
|
PeerWireClient *client = static_cast<PeerWireClient *>(sender());
|
|
|
|
// Remove the host from our list of known peers if the connection
|
|
// failed.
|
|
if (client->peer() && client->error() == QAbstractSocket::ConnectionRefusedError)
|
|
d->peers.removeAll(client->peer());
|
|
|
|
// Remove the client from RateController and all structures.
|
|
RateController::instance()->removeSocket(client);
|
|
d->connections.removeAll(client);
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.find(client);
|
|
while (it != d->payloads.end() && it.key() == client) {
|
|
TorrentPiece *piece = it.value();
|
|
piece->inProgress = false;
|
|
piece->requestedBlocks.fill(false);
|
|
it = d->payloads.erase(it);
|
|
}
|
|
|
|
// Remove pending read requests.
|
|
QMapIterator<int, PeerWireClient *> it2(d->readIds);
|
|
while (it2.findNext(client))
|
|
d->readIds.remove(it2.key());
|
|
|
|
// Delete the client later.
|
|
disconnect(client, SIGNAL(disconnected()), this, SLOT(removeClient()));
|
|
client->deleteLater();
|
|
ConnectionManager::instance()->removeConnection(client);
|
|
|
|
emit peerInfoUpdated();
|
|
d->callPeerConnector();
|
|
}
|
|
|
|
void TorrentClient::peerPiecesAvailable(const QBitArray &pieces)
|
|
{
|
|
PeerWireClient *client = qobject_cast<PeerWireClient *>(sender());
|
|
|
|
// Find the peer in our list of announced peers. If it's there,
|
|
// then we can use the piece list into to gather statistics that
|
|
// help us decide what peers to connect to.
|
|
TorrentPeer *peer = 0;
|
|
QList<TorrentPeer *>::Iterator it = d->peers.begin();
|
|
while (it != d->peers.end()) {
|
|
if ((*it)->address == client->peerAddress() && (*it)->port == client->peerPort()) {
|
|
peer = *it;
|
|
break;
|
|
}
|
|
++it;
|
|
}
|
|
|
|
// If the peer is a seed, and we are in seeding mode, then the
|
|
// peer is uninteresting.
|
|
if (pieces.count(true) == d->pieceCount) {
|
|
if (peer)
|
|
peer->seed = true;
|
|
emit peerInfoUpdated();
|
|
if (d->state == Seeding) {
|
|
client->abort();
|
|
return;
|
|
} else {
|
|
if (peer)
|
|
peer->interesting = true;
|
|
if ((client->peerWireState() & PeerWireClient::InterestedInPeer) == 0)
|
|
client->sendInterested();
|
|
d->callScheduler();
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Update our list of available pieces.
|
|
if (peer) {
|
|
peer->pieces = pieces;
|
|
peer->numCompletedPieces = pieces.count(true);
|
|
}
|
|
|
|
// Check for interesting pieces, and tell the peer whether we are
|
|
// interested or not.
|
|
bool interested = false;
|
|
int piecesSize = pieces.size();
|
|
for (int pieceIndex = 0; pieceIndex < piecesSize; ++pieceIndex) {
|
|
if (!pieces.testBit(pieceIndex))
|
|
continue;
|
|
if (!d->completedPieces.testBit(pieceIndex)) {
|
|
interested = true;
|
|
if ((client->peerWireState() & PeerWireClient::InterestedInPeer) == 0) {
|
|
if (peer)
|
|
peer->interesting = true;
|
|
client->sendInterested();
|
|
}
|
|
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.find(client);
|
|
int inProgress = 0;
|
|
while (it != d->payloads.end() && it.key() == client) {
|
|
if (it.value()->inProgress)
|
|
inProgress += it.value()->requestedBlocks.count(true);
|
|
++it;
|
|
}
|
|
if (!inProgress)
|
|
d->callScheduler();
|
|
break;
|
|
}
|
|
}
|
|
if (!interested && (client->peerWireState() & PeerWireClient::InterestedInPeer)) {
|
|
if (peer)
|
|
peer->interesting = false;
|
|
client->sendNotInterested();
|
|
}
|
|
}
|
|
|
|
void TorrentClient::peerRequestsBlock(int pieceIndex, int begin, int length)
|
|
{
|
|
PeerWireClient *client = qobject_cast<PeerWireClient *>(sender());
|
|
|
|
// Silently ignore requests from choked peers
|
|
if (client->peerWireState() & PeerWireClient::ChokingPeer)
|
|
return;
|
|
|
|
// Silently ignore requests for pieces we don't have.
|
|
if (!d->completedPieces.testBit(pieceIndex))
|
|
return;
|
|
|
|
// Request the block from the file manager
|
|
d->readIds.insert(d->fileManager.read(pieceIndex, begin, length),
|
|
qobject_cast<PeerWireClient *>(sender()));
|
|
}
|
|
|
|
void TorrentClient::blockReceived(int pieceIndex, int begin, const QByteArray &data)
|
|
{
|
|
PeerWireClient *client = qobject_cast<PeerWireClient *>(sender());
|
|
if (data.size() == 0) {
|
|
client->abort();
|
|
return;
|
|
}
|
|
|
|
// Ignore it if we already have this block.
|
|
int blockBit = begin / BlockSize;
|
|
TorrentPiece *piece = d->pendingPieces.value(pieceIndex);
|
|
if (!piece || piece->completedBlocks.testBit(blockBit)) {
|
|
// Discard blocks that we already have, and fill up the pipeline.
|
|
requestMore(client);
|
|
return;
|
|
}
|
|
|
|
// If we are in warmup or endgame mode, cancel all duplicate
|
|
// requests for this block.
|
|
if (d->state == WarmingUp || d->state == Endgame) {
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.begin();
|
|
while (it != d->payloads.end()) {
|
|
PeerWireClient *otherClient = it.key();
|
|
if (otherClient != client && it.value()->index == pieceIndex) {
|
|
if (otherClient->incomingBlocks().contains(TorrentBlock(pieceIndex, begin, data.size())))
|
|
it.key()->cancelRequest(pieceIndex, begin, data.size());
|
|
}
|
|
++it;
|
|
}
|
|
}
|
|
|
|
if (d->state != Downloading && d->state != Endgame && d->completedPieces.count(true) > 0)
|
|
d->setState(Downloading);
|
|
|
|
// Store this block
|
|
d->fileManager.write(pieceIndex, begin, data);
|
|
piece->completedBlocks.setBit(blockBit);
|
|
piece->requestedBlocks.clearBit(blockBit);
|
|
|
|
if (blocksLeftForPiece(piece) == 0) {
|
|
// Ask the file manager to verify the newly downloaded piece
|
|
d->fileManager.verifyPiece(piece->index);
|
|
|
|
// Remove this piece from all payloads
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.begin();
|
|
while (it != d->payloads.end()) {
|
|
if (!it.value() || it.value()->index == piece->index)
|
|
it = d->payloads.erase(it);
|
|
else
|
|
++it;
|
|
}
|
|
}
|
|
|
|
// Fill up the pipeline.
|
|
requestMore(client);
|
|
}
|
|
|
|
void TorrentClient::peerWireBytesWritten(qint64 size)
|
|
{
|
|
if (!d->transferRateTimer)
|
|
d->transferRateTimer = startTimer(RateControlTimerDelay);
|
|
|
|
d->uploadRate[0] += size;
|
|
d->uploadedBytes += size;
|
|
emit dataSent(size);
|
|
}
|
|
|
|
void TorrentClient::peerWireBytesReceived(qint64 size)
|
|
{
|
|
if (!d->transferRateTimer)
|
|
d->transferRateTimer = startTimer(RateControlTimerDelay);
|
|
|
|
d->downloadRate[0] += size;
|
|
d->downloadedBytes += size;
|
|
emit dataSent(size);
|
|
}
|
|
|
|
int TorrentClient::blocksLeftForPiece(const TorrentPiece *piece) const
|
|
{
|
|
int blocksLeft = 0;
|
|
int completedBlocksSize = piece->completedBlocks.size();
|
|
for (int i = 0; i < completedBlocksSize; ++i) {
|
|
if (!piece->completedBlocks.testBit(i))
|
|
++blocksLeft;
|
|
}
|
|
return blocksLeft;
|
|
}
|
|
|
|
void TorrentClient::scheduleUploads()
|
|
{
|
|
// Generate a list of clients sorted by their transfer
|
|
// speeds. When leeching, we sort by download speed, and when
|
|
// seeding, we sort by upload speed. Seeds are left out; there's
|
|
// no use in unchoking them.
|
|
QList<PeerWireClient *> allClients = d->connections;
|
|
QMultiMap<int, PeerWireClient *> transferSpeeds;
|
|
foreach (PeerWireClient *client, allClients) {
|
|
if (client->state() == QAbstractSocket::ConnectedState
|
|
&& client->availablePieces().count(true) != d->pieceCount) {
|
|
if (d->state == Seeding) {
|
|
transferSpeeds.insert(client->uploadSpeed(), client);
|
|
} else {
|
|
transferSpeeds.insert(client->downloadSpeed(), client);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Unchoke the top 'MaxUploads' downloaders (peers that we are
|
|
// uploading to) and choke all others.
|
|
int maxUploaders = MaxUploads;
|
|
QMapIterator<int, PeerWireClient *> it(transferSpeeds);
|
|
it.toBack();
|
|
while (it.hasPrevious()) {
|
|
PeerWireClient *client = it.previous().value();
|
|
bool interested = (client->peerWireState() & PeerWireClient::PeerIsInterested);
|
|
|
|
if (maxUploaders) {
|
|
allClients.removeAll(client);
|
|
if (client->peerWireState() & PeerWireClient::ChokingPeer)
|
|
client->unchokePeer();
|
|
--maxUploaders;
|
|
continue;
|
|
}
|
|
|
|
if ((client->peerWireState() & PeerWireClient::ChokingPeer) == 0) {
|
|
if ((qrand() % 10) == 0)
|
|
client->abort();
|
|
else
|
|
client->chokePeer();
|
|
allClients.removeAll(client);
|
|
}
|
|
if (!interested)
|
|
allClients.removeAll(client);
|
|
}
|
|
|
|
// Only interested peers are left in allClients. Unchoke one
|
|
// random peer to allow it to compete for a position among the
|
|
// downloaders. (This is known as an "optimistic unchoke".)
|
|
if (!allClients.isEmpty()) {
|
|
PeerWireClient *client = allClients[qrand() % allClients.size()];
|
|
if (client->peerWireState() & PeerWireClient::ChokingPeer)
|
|
client->unchokePeer();
|
|
}
|
|
}
|
|
|
|
void TorrentClient::scheduleDownloads()
|
|
{
|
|
d->schedulerCalled = false;
|
|
|
|
if (d->state == Stopping || d->state == Paused || d->state == Idle)
|
|
return;
|
|
|
|
// Check what each client is doing, and assign payloads to those
|
|
// who are either idle or done.
|
|
foreach (PeerWireClient *client, d->connections)
|
|
schedulePieceForClient(client);
|
|
}
|
|
|
|
void TorrentClient::schedulePieceForClient(PeerWireClient *client)
|
|
{
|
|
// Only schedule connected clients.
|
|
if (client->state() != QTcpSocket::ConnectedState)
|
|
return;
|
|
|
|
// The peer has choked us; try again later.
|
|
if (client->peerWireState() & PeerWireClient::ChokedByPeer)
|
|
return;
|
|
|
|
// Make a list of all the client's pending pieces, and count how
|
|
// many blocks have been requested.
|
|
QList<int> currentPieces;
|
|
bool somePiecesAreNotInProgress = false;
|
|
TorrentPiece *lastPendingPiece = 0;
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.find(client);
|
|
while (it != d->payloads.end() && it.key() == client) {
|
|
lastPendingPiece = it.value();
|
|
if (lastPendingPiece->inProgress) {
|
|
currentPieces << lastPendingPiece->index;
|
|
} else {
|
|
somePiecesAreNotInProgress = true;
|
|
}
|
|
++it;
|
|
}
|
|
|
|
// Skip clients that already have too many blocks in progress.
|
|
if (client->incomingBlocks().size() >= ((d->state == Endgame || d->state == WarmingUp)
|
|
? MaxBlocksInMultiMode : MaxBlocksInProgress))
|
|
return;
|
|
|
|
// If all pieces are in progress, but we haven't filled up our
|
|
// block requesting quota, then we need to schedule another piece.
|
|
if (!somePiecesAreNotInProgress || client->incomingBlocks().size() > 0)
|
|
lastPendingPiece = 0;
|
|
TorrentPiece *piece = lastPendingPiece;
|
|
|
|
// In warmup state, all clients request blocks from the same pieces.
|
|
if (d->state == WarmingUp && d->pendingPieces.size() >= 4) {
|
|
piece = d->payloads.value(client);
|
|
if (!piece) {
|
|
QList<TorrentPiece *> values = d->pendingPieces.values();
|
|
piece = values.value(qrand() % values.size());
|
|
piece->inProgress = true;
|
|
d->payloads.insert(client, piece);
|
|
}
|
|
if (piece->completedBlocks.count(false) == client->incomingBlocks().size())
|
|
return;
|
|
}
|
|
|
|
// If no pieces are currently in progress, schedule a new one.
|
|
if (!piece) {
|
|
// Build up a list of what pieces that we have not completed
|
|
// are available to this client.
|
|
QBitArray incompletePiecesAvailableToClient = d->incompletePieces;
|
|
|
|
// Remove all pieces that are marked as being in progress
|
|
// already (i.e., pieces that this or other clients are
|
|
// already waiting for). A special rule applies to warmup and
|
|
// endgame mode; there, we allow several clients to request
|
|
// the same piece. In endgame mode, this only applies to
|
|
// clients that are currently uploading (more than 1.0KB/s).
|
|
if ((d->state == Endgame && client->uploadSpeed() < 1024) || d->state != WarmingUp) {
|
|
QMap<int, TorrentPiece *>::ConstIterator it = d->pendingPieces.constBegin();
|
|
while (it != d->pendingPieces.constEnd()) {
|
|
if (it.value()->inProgress)
|
|
incompletePiecesAvailableToClient.clearBit(it.key());
|
|
++it;
|
|
}
|
|
}
|
|
|
|
// Remove all pieces that the client cannot download.
|
|
incompletePiecesAvailableToClient &= client->availablePieces();
|
|
|
|
// Remove all pieces that this client has already requested.
|
|
foreach (int i, currentPieces)
|
|
incompletePiecesAvailableToClient.clearBit(i);
|
|
|
|
// Only continue if more pieces can be scheduled. If no pieces
|
|
// are available and no blocks are in progress, just leave
|
|
// the connection idle; it might become interesting later.
|
|
if (incompletePiecesAvailableToClient.count(true) == 0)
|
|
return;
|
|
|
|
// Check if any of the partially completed pieces can be
|
|
// recovered, and if so, pick a random one of them.
|
|
QList<TorrentPiece *> partialPieces;
|
|
QMap<int, TorrentPiece *>::ConstIterator it = d->pendingPieces.constBegin();
|
|
while (it != d->pendingPieces.constEnd()) {
|
|
TorrentPiece *tmp = it.value();
|
|
if (incompletePiecesAvailableToClient.testBit(it.key())) {
|
|
if (!tmp->inProgress || d->state == WarmingUp || d->state == Endgame) {
|
|
partialPieces << tmp;
|
|
break;
|
|
}
|
|
}
|
|
++it;
|
|
}
|
|
if (!partialPieces.isEmpty())
|
|
piece = partialPieces.value(qrand() % partialPieces.size());
|
|
|
|
if (!piece) {
|
|
// Pick a random piece 3 out of 4 times; otherwise, pick either
|
|
// one of the most common or the least common pieces available,
|
|
// depending on the state we're in.
|
|
int pieceIndex = 0;
|
|
if (d->state == WarmingUp || (qrand() & 4) == 0) {
|
|
int *occurrences = new int[d->pieceCount];
|
|
memset(occurrences, 0, d->pieceCount * sizeof(int));
|
|
|
|
// Count how many of each piece are available.
|
|
foreach (PeerWireClient *peer, d->connections) {
|
|
QBitArray peerPieces = peer->availablePieces();
|
|
int peerPiecesSize = peerPieces.size();
|
|
for (int i = 0; i < peerPiecesSize; ++i) {
|
|
if (peerPieces.testBit(i))
|
|
++occurrences[i];
|
|
}
|
|
}
|
|
|
|
// Find the rarest or most common pieces.
|
|
int numOccurrences = d->state == WarmingUp ? 0 : 99999;
|
|
QList<int> piecesReadyForDownload;
|
|
for (int i = 0; i < d->pieceCount; ++i) {
|
|
if (d->state == WarmingUp) {
|
|
// Add common pieces
|
|
if (occurrences[i] >= numOccurrences
|
|
&& incompletePiecesAvailableToClient.testBit(i)) {
|
|
if (occurrences[i] > numOccurrences)
|
|
piecesReadyForDownload.clear();
|
|
piecesReadyForDownload.append(i);
|
|
numOccurrences = occurrences[i];
|
|
}
|
|
} else {
|
|
// Add rare pieces
|
|
if (occurrences[i] <= numOccurrences
|
|
&& incompletePiecesAvailableToClient.testBit(i)) {
|
|
if (occurrences[i] < numOccurrences)
|
|
piecesReadyForDownload.clear();
|
|
piecesReadyForDownload.append(i);
|
|
numOccurrences = occurrences[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
// Select one piece randomly
|
|
pieceIndex = piecesReadyForDownload.at(qrand() % piecesReadyForDownload.size());
|
|
delete [] occurrences;
|
|
} else {
|
|
// Make up a list of available piece indices, and pick
|
|
// a random one.
|
|
QList<int> values;
|
|
int incompletePiecesAvailableToClientSize = incompletePiecesAvailableToClient.size();
|
|
for (int i = 0; i < incompletePiecesAvailableToClientSize; ++i) {
|
|
if (incompletePiecesAvailableToClient.testBit(i))
|
|
values << i;
|
|
}
|
|
pieceIndex = values.at(qrand() % values.size());
|
|
}
|
|
|
|
// Create a new TorrentPiece and fill in all initial
|
|
// properties.
|
|
piece = new TorrentPiece;
|
|
piece->index = pieceIndex;
|
|
piece->length = d->fileManager.pieceLengthAt(pieceIndex);
|
|
int numBlocks = piece->length / BlockSize;
|
|
if (piece->length % BlockSize)
|
|
++numBlocks;
|
|
piece->completedBlocks.resize(numBlocks);
|
|
piece->requestedBlocks.resize(numBlocks);
|
|
d->pendingPieces.insert(pieceIndex, piece);
|
|
}
|
|
|
|
piece->inProgress = true;
|
|
d->payloads.insert(client, piece);
|
|
}
|
|
|
|
// Request more blocks from all pending pieces.
|
|
requestMore(client);
|
|
}
|
|
|
|
void TorrentClient::requestMore(PeerWireClient *client)
|
|
{
|
|
// Make a list of all pieces this client is currently waiting for,
|
|
// and count the number of blocks in progress.
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.find(client);
|
|
int numBlocksInProgress = client->incomingBlocks().size();
|
|
QList<TorrentPiece *> piecesInProgress;
|
|
while (it != d->payloads.end() && it.key() == client) {
|
|
TorrentPiece *piece = it.value();
|
|
if (piece->inProgress || (d->state == WarmingUp || d->state == Endgame))
|
|
piecesInProgress << piece;
|
|
++it;
|
|
}
|
|
|
|
// If no pieces are in progress, call the scheduler.
|
|
if (piecesInProgress.isEmpty() && d->incompletePieces.count(true)) {
|
|
d->callScheduler();
|
|
return;
|
|
}
|
|
|
|
// If too many pieces are in progress, there's nothing to do.
|
|
int maxInProgress = ((d->state == Endgame || d->state == WarmingUp)
|
|
? MaxBlocksInMultiMode : MaxBlocksInProgress);
|
|
if (numBlocksInProgress == maxInProgress)
|
|
return;
|
|
|
|
// Starting with the first piece that we're waiting for, request
|
|
// blocks until the quota is filled up.
|
|
foreach (TorrentPiece *piece, piecesInProgress) {
|
|
numBlocksInProgress += requestBlocks(client, piece, maxInProgress - numBlocksInProgress);
|
|
if (numBlocksInProgress == maxInProgress)
|
|
break;
|
|
}
|
|
|
|
// If we still didn't fill up the quota, we need to schedule more
|
|
// pieces.
|
|
if (numBlocksInProgress < maxInProgress && d->state != WarmingUp)
|
|
d->callScheduler();
|
|
}
|
|
|
|
int TorrentClient::requestBlocks(PeerWireClient *client, TorrentPiece *piece, int maxBlocks)
|
|
{
|
|
// Generate the list of incomplete blocks for this piece.
|
|
QVector<int> bits;
|
|
int completedBlocksSize = piece->completedBlocks.size();
|
|
for (int i = 0; i < completedBlocksSize; ++i) {
|
|
if (!piece->completedBlocks.testBit(i) && !piece->requestedBlocks.testBit(i))
|
|
bits << i;
|
|
}
|
|
|
|
// Nothing more to request.
|
|
if (bits.size() == 0) {
|
|
if (d->state != WarmingUp && d->state != Endgame)
|
|
return 0;
|
|
bits.clear();
|
|
for (int i = 0; i < completedBlocksSize; ++i) {
|
|
if (!piece->completedBlocks.testBit(i))
|
|
bits << i;
|
|
}
|
|
}
|
|
|
|
if (d->state == WarmingUp || d->state == Endgame) {
|
|
// By randomizing the list of blocks to request, we
|
|
// significantly speed up the warmup and endgame modes, where
|
|
// the same blocks are requested from multiple peers. The
|
|
// speedup comes from an increased chance of receiving
|
|
// different blocks from the different peers.
|
|
for (int i = 0; i < bits.size(); ++i) {
|
|
int a = qrand() % bits.size();
|
|
int b = qrand() % bits.size();
|
|
int tmp = bits[a];
|
|
bits[a] = bits[b];
|
|
bits[b] = tmp;
|
|
}
|
|
}
|
|
|
|
// Request no more blocks than we've been asked to.
|
|
int blocksToRequest = qMin(maxBlocks, bits.size());
|
|
|
|
// Calculate the offset and size of each block, and send requests.
|
|
for (int i = 0; i < blocksToRequest; ++i) {
|
|
int blockSize = BlockSize;
|
|
if ((piece->length % BlockSize) && bits.at(i) == completedBlocksSize - 1)
|
|
blockSize = piece->length % BlockSize;
|
|
client->requestBlock(piece->index, bits.at(i) * BlockSize, blockSize);
|
|
piece->requestedBlocks.setBit(bits.at(i));
|
|
}
|
|
|
|
return blocksToRequest;
|
|
}
|
|
|
|
void TorrentClient::peerChoked()
|
|
{
|
|
PeerWireClient *client = qobject_cast<PeerWireClient *>(sender());
|
|
if (!client)
|
|
return;
|
|
|
|
// When the peer chokes us, we immediately forget about all blocks
|
|
// we've requested from it. We also remove the piece from out
|
|
// payload, making it available to other clients.
|
|
QMultiMap<PeerWireClient *, TorrentPiece *>::Iterator it = d->payloads.find(client);
|
|
while (it != d->payloads.end() && it.key() == client) {
|
|
it.value()->inProgress = false;
|
|
it.value()->requestedBlocks.fill(false);
|
|
it = d->payloads.erase(it);
|
|
}
|
|
}
|
|
|
|
void TorrentClient::peerUnchoked()
|
|
{
|
|
PeerWireClient *client = qobject_cast<PeerWireClient *>(sender());
|
|
if (!client)
|
|
return;
|
|
|
|
// We got unchoked, which means we can request more blocks.
|
|
if (d->state != Seeding)
|
|
d->callScheduler();
|
|
}
|
|
|
|
void TorrentClient::addToPeerList(const QList<TorrentPeer> &peerList)
|
|
{
|
|
// Add peers we don't already know of to our list of peers.
|
|
QList<QHostAddress> addresses = QNetworkInterface::allAddresses();
|
|
foreach (TorrentPeer peer, peerList) {
|
|
if (addresses.contains(peer.address)
|
|
&& peer.port == TorrentServer::instance()->serverPort()) {
|
|
// Skip our own server.
|
|
continue;
|
|
}
|
|
|
|
bool known = false;
|
|
foreach (TorrentPeer *knownPeer, d->peers) {
|
|
if (knownPeer->port == peer.port
|
|
&& knownPeer->address == peer.address) {
|
|
known = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!known) {
|
|
TorrentPeer *newPeer = new TorrentPeer;
|
|
*newPeer = peer;
|
|
newPeer->interesting = true;
|
|
newPeer->seed = false;
|
|
newPeer->lastVisited = 0;
|
|
newPeer->connectStart = 0;
|
|
newPeer->connectTime = 999999;
|
|
newPeer->pieces.resize(d->pieceCount);
|
|
newPeer->numCompletedPieces = 0;
|
|
d->peers << newPeer;
|
|
}
|
|
}
|
|
|
|
// If we've got more peers than we can connect to, we remove some
|
|
// of the peers that have no (or low) activity.
|
|
int maxPeers = ConnectionManager::instance()->maxConnections() * 3;
|
|
if (d->peers.size() > maxPeers) {
|
|
// Find what peers are currently connected & active
|
|
QSet<TorrentPeer *> activePeers;
|
|
foreach (TorrentPeer *peer, d->peers) {
|
|
foreach (PeerWireClient *client, d->connections) {
|
|
if (client->peer() == peer && (client->downloadSpeed() + client->uploadSpeed()) > 1024)
|
|
activePeers << peer;
|
|
}
|
|
}
|
|
|
|
// Remove inactive peers from the peer list until we're below
|
|
// the max connections count.
|
|
QList<int> toRemove;
|
|
for (int i = 0; i < d->peers.size() && (d->peers.size() - toRemove.size()) > maxPeers; ++i) {
|
|
if (!activePeers.contains(d->peers.at(i)))
|
|
toRemove << i;
|
|
}
|
|
QListIterator<int> toRemoveIterator(toRemove);
|
|
toRemoveIterator.toBack();
|
|
while (toRemoveIterator.hasPrevious())
|
|
d->peers.removeAt(toRemoveIterator.previous());
|
|
|
|
// If we still have too many peers, remove the oldest ones.
|
|
while (d->peers.size() > maxPeers)
|
|
d->peers.takeFirst();
|
|
}
|
|
|
|
if (d->state != Paused && d->state != Stopping && d->state != Idle) {
|
|
if (d->state == Searching || d->state == WarmingUp)
|
|
connectToPeers();
|
|
else
|
|
d->callPeerConnector();
|
|
}
|
|
}
|
|
|
|
void TorrentClient::trackerStopped()
|
|
{
|
|
d->setState(Idle);
|
|
emit stopped();
|
|
}
|
|
|
|
void TorrentClient::updateProgress(int progress)
|
|
{
|
|
if (progress == -1 && d->pieceCount > 0) {
|
|
int newProgress = (d->completedPieces.count(true) * 100) / d->pieceCount;
|
|
if (d->lastProgressValue != newProgress) {
|
|
d->lastProgressValue = newProgress;
|
|
emit progressUpdated(newProgress);
|
|
}
|
|
} else if (d->lastProgressValue != progress) {
|
|
d->lastProgressValue = progress;
|
|
emit progressUpdated(progress);
|
|
}
|
|
}
|