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#include "downloadmanager.h"
int DownloadManager::downloaded = 0;
// -------------------------------------------------------------------------------------------------------
DownloadManager::DownloadManager() {
qxtLog->debug() << "Initializing download manager...";
checkDownloadDirectory();
_qnam = new QNetworkAccessManager();
_qnam->moveToThread(&dmThread);
dip = false;
}
DownloadManager::~DownloadManager() {
delete _qnam;
}
// -------------------------------------------------------------------------------------------------------
void DownloadManager::checkDownloadDirectory() {
// check if downloadPath exists, if not create it.
downloadDir = QDir(downloadPath);
if (!downloadDir.exists()) {
qxtLog->debug() << "[dm] Download directory: " << downloadDir.path()
<< " doesn't exist.";
// try to create the directory
if (QDir::current().mkdir(downloadPath))
qxtLog->debug() << "[dm] Created download directory: "
<< downloadDir.path();
else {
qxtLog->debug() << "[dm] Failed to create directory: "
<< downloadDir.path();
// try to save to /tmp/fbgui
downloadDir.setPath(QDir::tempPath() + "/fbgui");
if (!downloadDir.exists()) {
if (QDir::current().mkdir(QDir::tempPath() + "/fbgui"))
qxtLog->debug() << "[dm] Successfully created: "
<< downloadDir.absolutePath();
else {
// just in case
qxtLog->debug() << "[dm] Failed to create: "
<< downloadDir.absolutePath();
qxtLog->debug() << "[dm] Exiting...";
exit( EXIT_FAILURE);
}
} else
qxtLog->debug() << "[dm] " << downloadDir.absolutePath()
<< " already exists.";
}
} else
qxtLog->debug() << "[dm] Download directory: "
<< downloadDir.absolutePath() << " already exists.";
qxtLog->debug() << "[dm] Saving downloads to: "
<< downloadDir.absolutePath();
downloadPath = downloadDir.absolutePath();
}
// -------------------------------------------------------------------------------------------------------
// Public access
// -------------------------------------------------------------------------------------------------------
void DownloadManager::downloadFile(const QString& filename) {
QUrl fileUrl(baseURL.resolved(QUrl(filename)));
this->processDownloadRequest(fileUrl);
}
// -------------------------------------------------------------------------------------------------------
void DownloadManager::downloadFile(const QUrl& fileUrl) {
this->processDownloadRequest(fileUrl);
}
// -------------------------------------------------------------------------------------------------------
// Private functions handling download requests and queueing
// -------------------------------------------------------------------------------------------------------
void DownloadManager::processDownloadRequest(const QUrl& url) {
if (url.isEmpty()) {
qxtLog->debug() << "[dm] No URL specified for download.";
return;
}
qxtLog->debug() << "[dm] Enqueueing: " << url.toString();
dlQ.enqueue(url);
if (dip) {
// download in progress, return.
qxtLog->debug() << "[dm] Download in progress! Queued:" << url.toString()
<< "(" << dlQ.size() << " in queue)";
return;
}
// no running downloads: start next in queue
startNextDownload();
}
// -------------------------------------------------------------------------------------------------------
void DownloadManager::startNextDownload() {
QWSServer::instance()->setCursorVisible(false);
if (dlQ.isEmpty()) {
emit downloadQueueEmpty();
qxtLog->debug() << "[dm] Download manager ready. (1)";
return;
}
qxtLog->debug() << "[dm] Starting next download: " << dlQ.head().toString()
<< " (" << dlQ.size() - 1 << " in queue.)";
// dequeue next URL to download.
QUrl url = dlQ.dequeue();
// get filename from URL.
QString tmp = url.path();
tmp.remove(0, tmp.lastIndexOf(QChar('/')) + 1);
// check if filename exists on target file system
if (downloadDir.exists(tmp)) {
qxtLog->debug() << "[dm] File already exists: "
<< downloadDir.absoluteFilePath(tmp);
outfile.setFileName(QString(downloadDir.absolutePath() + "/" + tmp
+ ".\%1").arg(downloaded));
} else
outfile.setFileName(downloadDir.absoluteFilePath(tmp));
qxtLog->debug() << "[dm] Saving to: " << outfile.fileName();
// try to open for writing
if (!outfile.open(QIODevice::WriteOnly)) {
qxtLog->debug() << "[dm] No write access to " << outfile.fileName()
<< " . Skipping download...";
return;
}
// send the request for the file
QNetworkRequest request(url);
currentDownload = _qnam->get(request);
lastProgress = 0;
currentProgress = 0;
dip = true;
_time.start();
QObject::connect(currentDownload, SIGNAL(readyRead()), this, SLOT(
downloadReady()));
QObject::connect(currentDownload, SIGNAL(metaDataChanged()), this, SLOT(
processMetaInfo()));
QObject::connect(currentDownload, SIGNAL(downloadProgress(qint64, qint64)),
this, SLOT(downloadProgress(qint64, qint64)));
QObject::connect(currentDownload, SIGNAL(finished()), this, SLOT(
downloadFinished()));
}
// -------------------------------------------------------------------------------------------------------
// Private slots to handle a download in progress
// -------------------------------------------------------------------------------------------------------
void DownloadManager::processMetaInfo() {
// fetch filesize from header & filename from URL (for now)
const QByteArray cltag = "Content-Length";
QByteArray clinfo = currentDownload->rawHeader(cltag);
QFileInfo fi(outfile);
qxtLog->debug() << "[dm] Download Info: " << fi.fileName() << " (Size: "
<< clinfo.toDouble() << ")";
emit downloadInfo(fi.fileName(), clinfo.toDouble());
}
// -------------------------------------------------------------------------------------------------------
void DownloadManager::downloadReady() {
// data ready, save it
outfile.write(currentDownload->readAll());
}
// -------------------------------------------------------------------------------------------------------
void DownloadManager::downloadProgress(qint64 bytesIn, qint64 bytesTotal) {
if (bytesIn > bytesTotal || bytesTotal <= 0) {
qxtLog->debug() << "[dm] downloadProgress invalid values:" << "In:"
<< bytesIn << " / Total: " << bytesTotal;
return;
}
// calculate current speed
double speed = bytesIn * 1000 / _time.elapsed();
QString unit;
if (speed < 1024) {
unit = "bytes/sec";
} else if (speed < 1024 * 1024) {
speed /= 1024;
unit = "KB/s";
} else {
speed /= 1024 * 1024;
unit = "MB/s";
}
// update progress only if difference higher than the updateInterval setting
currentProgress = ((bytesIn * 100) / bytesTotal);
if (currentProgress - lastProgress >= updateInterval) {
lastProgress = currentProgress;
emit updateProgress(currentProgress, speed, unit);
qxtLog->debug() << "[dm] Download progress of "
<< currentDownload->url().toString() << ": " << bytesIn << "/"
<< bytesTotal << "(" << currentProgress << "\%)";
}
}
// -------------------------------------------------------------------------------------------------------
void DownloadManager::downloadFinished() {
// check for errors
if (currentDownload->error()) {
outfile.close();
outfile.remove();
int statusCode = currentDownload->attribute(
QNetworkRequest::HttpStatusCodeAttribute).toInt();
qxtLog->debug() << "[dm] Download of "
<< currentDownload->url().toString()
<< " failed with HTTP error code: " << statusCode;
emit notify(QString("Download failed! HTTP Status Code: %1").arg(
statusCode));
currentDownload->deleteLater();
} else {
// end download
outfile.close();
downloaded++;
qxtLog->debug() << "[dm] Download of "
<< currentDownload->url().toString() << " finished. (downloaded = "
<< downloaded << ")";
emit notify(QString("Successfully downloaded %1").arg(
currentDownload->url().toString()));
currentDownload->deleteLater();
}
dip = false;
// process next in queue, if any
if (dlQ.isEmpty()) {
emit downloadQueueEmpty();
qxtLog->debug() << "[dm] Download manager ready. (2)";
return;
}
startNextDownload();
}
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