Memory leak in QNetworkProxy (should i post on bugtracker?)

Vlad_Savelyev

I working on a web-spider application that uses lot of proxies. The problem is the memory leaks are enormouse, up to 100 mb in 5 minutes. I wrote a simple test like this, which runs inside QThread:

worker::process()
{
//here i read the proxies from file first
  QString readAll;
  QFile file("proxies.txt");
  if(!file.open(QIODevice::ReadWrite))
  {
     qDebug() << file.errorString();
     emit finished();
     eturn;
  }
  QTextStream in(&file);

      while(!in.atEnd())
      {

          readAll = in.readAll();

      }
      file.close();

   
//split the proxies by new line to the QStringList
  QStringList lst = readAll.split(QRegExp("(\\r\\n)|(\\n\\r)|\\r|\\n"), QString::SkipEmptyParts);

  foreach(QString proxy,lst){

        QNetworkRequest request;
        request.setUrl(QUrl("https://google.com/"));

        request.setRawHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/2022021 Firefox/46.0");

        QStringList parts = proxy.split(":");
        QString s_port = parts[1];
      // here is the thing
        QNetworkProxy webProxy;
            webProxy.setHostName(parts[0]);
            webProxy.setPort(s_port.toUShort());
            webProxy.setType(QNetworkProxy::Socks5Proxy);

           m.setProxy(webProxy);


           QNetworkReply * reply = m.get(request);
           QTimer timer;
           timer.setSingleShot(true);

           QEventLoop loop;
           QObject::connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
           QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
           timer.start(1*1000);
           loop.exec();

           if(reply->isFinished())
               reply->abort();

           reply->close();
           delete reply;
     }
}

So in this foreach im doing the requests, and see memory goes SUPER crazy, and it never decreases even if i stop the thread. But if i comment out this:


 QNetworkProxy webProxy;
       /*     webProxy.setHostName(parts[0]);
            webProxy.setPort(s_port.toUShort());
            webProxy.setType(QNetworkProxy::Socks5Proxy);*/

           m.setProxy(webProxy);

So basically no proxy request, i dont see any leakages. All is stable. Is it a possible bug? I don't know if i write post here or report to bugtracker? Also im using a small timeout with QEventLoop here, its just for the sake of example, but in reality, i need to abort the request if the proxy is invalid, otherwise it could hang for hours (maybe even days)

kshegunov

@Vlad_Savelyev
Hello,
Could you prepare a minimal working example that reproduces this behavior. I could test on my machine, and you'd probably be asked for it anyway if you report as a bug.

Kind regards.

Vlad_Savelyev

sure i will reply with the project code