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[Backport release-3_4] Fix import URL eating tons of memory on large file downloads #5833

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[Backport release-3_4] Fix import URL eating tons of memory on large file downloads #5833

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658eec9
Fix import URL eating tons of memory on large file downloads
nirvn Nov 17, 2024
eab0e15
Silence warning
nirvn Nov 18, 2024
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38 changes: 27 additions & 11 deletions src/core/appinterface.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
#include <QFileInfo>
#include <QImageReader>
#include <QQuickItem>
#include <QTemporaryFile>
#include <qgsapplication.h>
#include <qgsmessagelog.h>
#include <qgsproject.h>
Expand Down Expand Up @@ -278,6 +279,15 @@ void AppInterface::importUrl( const QString &url )
sanitizedUrl = QStringLiteral( "https://%1" ).arg( sanitizedUrl );
}

const QString applicationDirectory = PlatformUtilities::instance()->applicationDirectory();
if ( applicationDirectory.isEmpty() )
return;

QTemporaryFile *temporaryFile = new QTemporaryFile();
temporaryFile->setFileTemplate( QStringLiteral( "%1/XXXXXXXXXXXX" ).arg( applicationDirectory ) );
temporaryFile->setAutoRemove( false );
temporaryFile->open();

QgsNetworkAccessManager *manager = QgsNetworkAccessManager::instance();
QNetworkRequest request( ( QUrl( sanitizedUrl ) ) );
request.setAttribute( QNetworkRequest::RedirectPolicyAttribute, QNetworkRequest::NoLessSafeRedirectPolicy );
Expand All @@ -286,15 +296,18 @@ void AppInterface::importUrl( const QString &url )

QNetworkReply *reply = manager->get( request );
connect( reply, &QNetworkReply::downloadProgress, this, [=]( int bytesReceived, int bytesTotal ) {
temporaryFile->write( reply->readAll() );
if ( bytesTotal != 0 )
{
emit importProgress( static_cast<double>( bytesReceived ) / bytesTotal );
}
} );

connect( reply, &QNetworkReply::finished, this, [=]() {
const QString applicationDirectory = PlatformUtilities::instance()->applicationDirectory();
if ( !applicationDirectory.isEmpty() && reply->error() == QNetworkReply::NoError )
std::unique_ptr<QTemporaryFile> tmpFile;
tmpFile.reset( temporaryFile );

if ( reply->error() == QNetworkReply::NoError )
{
QString fileName = reply->url().fileName();
QString contentDisposition = reply->header( QNetworkRequest::ContentDispositionHeader ).toString();
Expand Down Expand Up @@ -322,13 +335,10 @@ void AppInterface::importUrl( const QString &url )
}
QDir( QFileInfo( filePath ).absolutePath() ).mkpath( "." );

QFile file( filePath );
if ( file.open( QIODevice::WriteOnly ) )
tmpFile->write( reply->readAll() );
tmpFile->close();
if ( tmpFile->rename( filePath ) )
{
const QByteArray data = reply->readAll();
file.write( data );
file.close();

if ( fileSuffix == QLatin1String( "zip" ) )
{
// Check if this is a compressed project and handle accordingly
Expand All @@ -353,26 +363,32 @@ void AppInterface::importUrl( const QString &url )

if ( QgsZipUtils::unzip( filePath, zipDirectory, zipFiles, false ) )
{
file.remove();
tmpFile->remove();
// Project archive successfully imported
emit importEnded( zipDirectory );
return;
}
else
{
// Broken archive, bail out
// Broken project archive, bail out
QDir dir( zipDirectory );
dir.removeRecursively();
file.remove();
tmpFile->remove();
filePath.clear();
emit importEnded();
return;
}
}
}

// Dataset successfully imported
emit importEnded( QFileInfo( filePath ).absolutePath() );
return;
}
}

// cppcheck-suppress nullPointer
tmpFile->remove();
emit importEnded();
} );
}
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