/* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies) (C) 2012 Digia Plc. and/or its subsidiary(-ies) This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include "DNSResolveQueue.h" #include <QHostInfo> #include <QObject> #include <QString> #include <wtf/text/WTFString.h> namespace WebCore { class DnsPrefetchHelper : public QObject { Q_OBJECT public: DnsPrefetchHelper() : QObject() { } public Q_SLOTS: void lookup(QString hostname) { if (hostname.isEmpty()) { DNSResolveQueue::shared().decrementRequestCount(); return; // this actually happens } QHostInfo::lookupHost(hostname, this, SLOT(lookedUp(QHostInfo))); } void lookedUp(const QHostInfo&) { // we do not cache the result, we throw it away. // we currently rely on the OS to cache the results. If it does not do that // then at least the ISP nameserver did it. // Since Qt 4.6.3, Qt also has a small DNS cache. DNSResolveQueue::shared().decrementRequestCount(); } }; // This is called on mouse over a href and on page loading. void prefetchDNS(const String& hostname) { if (hostname.isEmpty()) return; DNSResolveQueue::shared().add(hostname); } bool DNSResolveQueue::platformProxyIsEnabledInSystemPreferences() { // Qt expects the system or a proxy to cache the result, but other platforms disable WebCore DNS prefetching when proxies are enabled. return false; } // This is called by the platform-independent DNSResolveQueue. void DNSResolveQueue::platformResolve(const String& hostname) { static DnsPrefetchHelper dnsPrefetchHelper; dnsPrefetchHelper.lookup(QString(hostname)); } } // namespace #include "DNSQt.moc"