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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "peerwireclient.h"
#include "ratecontroller.h"
#include <QtCore>
Q_GLOBAL_STATIC(RateController, rateController)
RateController *RateController::instance()
{
return rateController();
}
void RateController::addSocket(PeerWireClient *socket)
{
connect(socket, &PeerWireClient::readyToTransfer,
this, &RateController::scheduleTransfer);
socket->setReadBufferSize(downLimit * 4);
sockets << socket;
scheduleTransfer();
}
void RateController::removeSocket(PeerWireClient *socket)
{
disconnect(socket, &PeerWireClient::readyToTransfer,
this, &RateController::scheduleTransfer);
socket->setReadBufferSize(0);
sockets.remove(socket);
}
void RateController::setDownloadLimit(int bytesPerSecond)
{
downLimit = bytesPerSecond;
for (PeerWireClient *socket : qAsConst(sockets))
socket->setReadBufferSize(downLimit * 4);
}
void RateController::scheduleTransfer()
{
if (transferScheduled)
return;
transferScheduled = true;
QTimer::singleShot(50, this, SLOT(transfer()));
}
void RateController::transfer()
{
transferScheduled = false;
if (sockets.isEmpty())
return;
qint64 msecs = 1000;
if (stopWatch.isValid())
msecs = qMin(msecs, stopWatch.elapsed());
qint64 bytesToWrite = (upLimit * msecs) / 1000;
qint64 bytesToRead = (downLimit * msecs) / 1000;
if (bytesToWrite == 0 && bytesToRead == 0) {
scheduleTransfer();
return;
}
QSet<PeerWireClient *> pendingSockets;
for (PeerWireClient *client : qAsConst(sockets)) {
if (client->canTransferMore())
pendingSockets << client;
}
if (pendingSockets.isEmpty())
return;
stopWatch.start();
bool canTransferMore;
do {
canTransferMore = false;
qint64 writeChunk = qMax<qint64>(1, bytesToWrite / pendingSockets.size());
qint64 readChunk = qMax<qint64>(1, bytesToRead / pendingSockets.size());
for (auto it = pendingSockets.begin(), end = pendingSockets.end(); it != end && (bytesToWrite > 0 || bytesToRead > 0); /*erasing*/) {
auto current = it++;
PeerWireClient *socket = *current;
if (socket->state() != QAbstractSocket::ConnectedState) {
it = pendingSockets.erase(current);
continue;
}
bool dataTransferred = false;
qint64 available = qMin<qint64>(socket->socketBytesAvailable(), readChunk);
if (available > 0) {
qint64 readBytes = socket->readFromSocket(qMin<qint64>(available, bytesToRead));
if (readBytes > 0) {
bytesToRead -= readBytes;
dataTransferred = true;
}
}
if (upLimit * 2 > socket->bytesToWrite()) {
qint64 chunkSize = qMin<qint64>(writeChunk, bytesToWrite);
qint64 toWrite = qMin(upLimit * 2 - socket->bytesToWrite(), chunkSize);
if (toWrite > 0) {
qint64 writtenBytes = socket->writeToSocket(toWrite);
if (writtenBytes > 0) {
bytesToWrite -= writtenBytes;
dataTransferred = true;
}
}
}
if (dataTransferred && socket->canTransferMore())
canTransferMore = true;
else
it = pendingSockets.erase(current);
}
} while (canTransferMore && (bytesToWrite > 0 || bytesToRead > 0) && !pendingSockets.isEmpty());
if (canTransferMore || bytesToWrite == 0 || bytesToRead == 0)
scheduleTransfer();
}
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