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#include "DownloadManager.h"
// ----------------------------------------------------------------------------------------
void DownloadManager::get(QString& filename)
{
// Forge URL from the given filename and the base URL.
QUrl u = this->baseUrl.resolved(filename);
// If download in progress, enqueue file and return.
if (dip)
{
qDebug() << "Download in progress! Enqueueing:" << u.toString();
dlQ.enqueue(u);
return;
}
// No running downloads: enqueue and start next download.
dlQ.enqueue(u);
qDebug() << "Enqueueing:" << u.toString() << endl;
startNextDownload();
}
// ----------------------------------------------------------------------------------------
void DownloadManager::startNextDownload()
{
qDebug() << "Starting next download: " << dlQ.head().toString()
<< "(" << dlQ.size() << "in queue.)";
// Set flag for download in progress.
dip = true;
// TODO: needed ?
if (dlQ.isEmpty())
{
qDebug() << "Download queue empty! Exiting...";
return;
}
// Dequeue next URL to download.
QUrl url = dlQ.dequeue();
//qDebug() << "Dequeueing..." << url.toString();
// Extract the filename from the URL
QString path = url.path();
QString basename = QFileInfo(path).fileName();
if (basename.isEmpty())
this->filename = "download";
else
this->filename = basename;
//qDebug() << "Path is: " << path << endl;
//qDebug() << "Basename is: " << basename << endl;
//qDebug() << "Filename is: " << this->filename;
outfile.setFileName(this->filename);
// If error upon opening, skip this file.
if (!outfile.open(QIODevice::WriteOnly))
{
qDebug() << "Couldn't open file! Exiting...";
startNextDownload();
return;
}
// Start the request for this URL.
QNetworkRequest request(url);
currentDownload = (*qnam).get(request);
QObject::connect(currentDownload, SIGNAL(readyRead()), this, SLOT(downloadReady()));
QObject::connect(currentDownload, SIGNAL(downloadProgress(qint64, qint64)),
this, SLOT(downloadProgress(qint64, qint64)));
QObject::connect(currentDownload, SIGNAL(finished()), this, SLOT(downloadFinished()));
}
// ----------------------------------------------------------------------------------------
// Slots for the signals emmited by currentDownload.
// ----------------------------------------------------------------------------------------
// This slot listens to readyRead() emmited when data is available for reading.
void DownloadManager::downloadReady()
{
// readyRead() fired, so save the readable data.
outfile.write(this->currentDownload->readAll());
}
// ----------------------------------------------------------------------------------------
// This slot listens to the downloadProgress(..)
// which provides information on the download progress of the file.
void DownloadManager::downloadProgress(qint64 bytesIn, qint64 bytesTotal)
{
qDebug() << "Download progress of " << currentDownload->url().toString()
<< ": " << bytesIn << "/" << bytesTotal;
}
// ----------------------------------------------------------------------------------------
// This slot listens to the finished() which is emmited
// when all the data from the reply has been read.
void DownloadManager::downloadFinished()
{
// Second check if the download actually is finished.
if (currentDownload->isFinished())
qDebug() << "Downloaded " << currentDownload->url().toString() << endl;
// Close output file.
outfile.close();
// If queue is empty, we are done.
// TODO: not sure if this is actually needed...
if (dlQ.isEmpty())
return;
// Queue not empty.
// Delete current reply object.
currentDownload->deleteLater();
// Initialise next download.
dip = false;
startNextDownload();
}
// ----------------------------------------------------------------------------------------
// Constructor.
DownloadManager::DownloadManager(const QUrl& baseUrl)
{
qDebug() << endl << "Initialising Download Manager...";
this->qnam = new QNetworkAccessManager();
this->baseUrl = baseUrl;
dip = false;
}
// Destructor.
DownloadManager::~DownloadManager()
{
delete[] this->qnam;
}
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