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|
package DownloadManager;
use strict;
use warnings;
use QtCore4;
use QtNetwork4;
use QtCore4::isa qw( Qt::Object );
use TextProgressBar;
use QtCore4::signals
finished => [];
use QtCore4::slots
startNextDownload => [],
downloadProgress => ['qint64', 'qint64'],
downloadFinished => [],
downloadReadyRead => [];
use Scalar::Util qw( reftype );
sub manager() {
return this->{manager};
}
sub downloadQueue() {
return this->{downloadQueue};
}
sub currentDownload() {
return this->{currentDownload};
}
sub output() {
return this->{output};
}
sub downloadTime() {
return this->{downloadTime};
}
sub progressBar() {
return this->{progressBar};
}
sub downloadedCount() {
return this->{downloadedCount};
}
sub totalCount() {
return this->{totalCount};
}
sub NEW
{
my ($class, $parent) = @_;
$class->SUPER::NEW($parent);
this->{downloadedCount} = 0;
this->{totalCount} = 0;
this->{manager} = Qt::NetworkAccessManager();
this->{output} = Qt::File();
this->{downloadTime} = Qt::Time();
this->{progressBar} = TextProgressBar->new();
this->{downloadQueue} = [];
}
sub append
{
my ($url) = @_;
if ( reftype( $url ) eq 'ARRAY' ) {
foreach my $url2 ( @{$url} ) {
append(Qt::Url::fromEncoded(Qt::ByteArray($url2)));
}
if (scalar @{downloadQueue()} == 0) {
Qt::Timer::singleShot(0, this, SIGNAL 'finished()');
}
return;
}
if (scalar @{downloadQueue()} == 0) {
Qt::Timer::singleShot(0, this, SLOT 'startNextDownload()');
}
push @{downloadQueue()}, $url;
++(this->{totalCount});
}
sub saveFileName
{
my ($url) = @_;
my $path = $url->path();
my $basename = Qt::FileInfo($path)->fileName();
if (!defined $basename) {
$basename = 'download';
}
if (Qt::File::exists($basename)) {
# already exists, don't overwrite
my $i = 0;
$basename .= '.';
while (Qt::File::exists($basename . $i)) {
++$i;
}
$basename .= $i;
}
return $basename;
}
sub startNextDownload
{
if (scalar @{downloadQueue()} == 0) {
printf "%d/%d files downloaded successfully\n", downloadedCount(), totalCount();
emit finished();
return;
}
my $url = shift @{downloadQueue()};
my $filename = saveFileName($url);
output()->setFileName($filename);
if (!output()->open(Qt::IODevice::WriteOnly())) {
printf STDERR "Problem opening save file '%s' for download '%s': %s\n",
$filename, $url->toEncoded()->constData(),
output()->errorString();
startNextDownload();
return; # skip this download
}
my $request = Qt::NetworkRequest($url);
this->{currentDownload} = manager()->get($request);
this->connect(currentDownload, SIGNAL 'downloadProgress(qint64,qint64)',
SLOT 'downloadProgress(qint64,qint64)');
this->connect(currentDownload, SIGNAL 'finished()',
SLOT 'downloadFinished()');
this->connect(currentDownload, SIGNAL 'readyRead()',
SLOT 'downloadReadyRead()');
# prepare the output
printf "Downloading %s...\n", $url->toEncoded()->constData();
downloadTime()->start();
}
sub downloadProgress
{
my ($bytesReceived, $bytesTotal) = @_;
progressBar()->setStatus($bytesReceived, $bytesTotal);
# calculate the download speed
my $speed = $bytesReceived * 1000.0 / downloadTime()->elapsed();
my $unit;
if ($speed < 1024) {
$unit = 'bytes/sec';
} elsif ($speed < 1024*1024) {
$speed /= 1024;
$unit = 'kB/s';
} else {
$speed /= 1024*1024;
$unit = 'MB/s';
}
progressBar()->setMessage(sprintf '%03f %s', $speed, $unit);
progressBar()->update();
}
sub downloadFinished
{
progressBar()->clear();
output()->close();
if (currentDownload->error() != Qt::NetworkReply::NoError()) {
# download failed
printf STDERR "Failed: %s\n", currentDownload->errorString();
} else {
printf "Succeeded.\n";
++(this->{downloadedCount});
}
startNextDownload();
}
sub downloadReadyRead
{
output()->write(currentDownload->readAll());
}
1;
|
