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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QHOSTINFO_P_H
#define QHOSTINFO_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of the QHostInfo class. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtNetwork/private/qtnetworkglobal_p.h>
#include "QtCore/qcoreapplication.h"
#include "private/qcoreapplication_p.h"
#include "private/qmetaobject_p.h"
#include "QtNetwork/qhostinfo.h"
#include "QtCore/qmutex.h"
#include "QtCore/qwaitcondition.h"
#include "QtCore/qobject.h"
#include "QtCore/qpointer.h"
#include "QtCore/qthread.h"
#if QT_CONFIG(thread)
#include "QtCore/qthreadpool.h"
#endif
#include "QtCore/qrunnable.h"
#include "QtCore/qlist.h"
#include "QtCore/qqueue.h"
#include <QElapsedTimer>
#include <QCache>
#include <atomic>
QT_BEGIN_NAMESPACE
class QHostInfoResult : public QObject
{
Q_OBJECT
public:
explicit QHostInfoResult(const QObject *receiver, QtPrivate::SlotObjUniquePtr slot);
~QHostInfoResult() override;
void postResultsReady(const QHostInfo &info);
Q_SIGNALS:
void resultsReady(const QHostInfo &info);
private Q_SLOTS:
void finalizePostResultsReady(const QHostInfo &info);
private:
QHostInfoResult(QHostInfoResult *other)
: receiver(other->receiver.get() != other ? other->receiver.get() : this),
slotObj{std::move(other->slotObj)}
{
// cleanup if the application terminates before results are delivered
connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit,
this, &QObject::deleteLater);
// maintain thread affinity
moveToThread(other->thread());
}
// receiver is either a QObject provided by the user,
// or it's set to `this` (to emulate the behavior of the contextless connect())
QPointer<const QObject> receiver = nullptr;
QtPrivate::SlotObjUniquePtr slotObj;
};
class QHostInfoAgent
{
public:
static QHostInfo fromName(const QString &hostName);
static QHostInfo lookup(const QString &hostName);
static QHostInfo reverseLookup(const QHostAddress &address);
};
class QHostInfoPrivate
{
public:
inline QHostInfoPrivate()
: err(QHostInfo::NoError),
errorStr(QLatin1StringView(QT_TRANSLATE_NOOP("QHostInfo", "Unknown error"))),
lookupId(0)
{
}
static int lookupHostImpl(const QString &name,
const QObject *receiver,
QtPrivate::QSlotObjectBase *slotObj,
const char *member);
QHostInfo::HostInfoError err;
QString errorStr;
QList<QHostAddress> addrs;
QString hostName;
int lookupId;
};
// These functions are outside of the QHostInfo class and strictly internal.
// Do NOT use them outside of QAbstractSocket.
QHostInfo Q_NETWORK_EXPORT qt_qhostinfo_lookup(const QString &name, QObject *receiver, const char *member, bool *valid, int *id);
void Q_AUTOTEST_EXPORT qt_qhostinfo_clear_cache();
void Q_AUTOTEST_EXPORT qt_qhostinfo_enable_cache(bool e);
void Q_AUTOTEST_EXPORT qt_qhostinfo_cache_inject(const QString &hostname, const QHostInfo &resolution);
class QHostInfoCache
{
public:
QHostInfoCache();
const int max_age; // seconds
QHostInfo get(const QString &name, bool *valid);
void put(const QString &name, const QHostInfo &info);
void clear();
bool isEnabled() { return enabled.load(std::memory_order_relaxed); }
// this function is currently only used for the auto tests
// and not usable by public API
void setEnabled(bool e) { enabled.store(e, std::memory_order_relaxed); }
private:
std::atomic<bool> enabled;
struct QHostInfoCacheElement {
QHostInfo info;
QElapsedTimer age;
};
QCache<QString,QHostInfoCacheElement> cache;
QMutex mutex;
};
// the following classes are used for the (normal) case: We use multiple threads to lookup DNS
class QHostInfoRunnable : public QRunnable
{
public:
explicit QHostInfoRunnable(const QString &hn, int i, const QObject *receiver,
QtPrivate::SlotObjUniquePtr slotObj);
~QHostInfoRunnable() override;
void run() override;
QString toBeLookedUp;
int id;
QHostInfoResult resultEmitter;
};
class QHostInfoLookupManager
{
public:
QHostInfoLookupManager();
~QHostInfoLookupManager();
void clear();
// called from QHostInfo
void scheduleLookup(QHostInfoRunnable *r);
void abortLookup(int id);
// called from QHostInfoRunnable
void lookupFinished(QHostInfoRunnable *r);
bool wasAborted(int id);
QHostInfoCache cache;
friend class QHostInfoRunnable;
protected:
#if QT_CONFIG(thread)
QList<QHostInfoRunnable*> currentLookups; // in progress
QList<QHostInfoRunnable*> postponedLookups; // postponed because in progress for same host
#endif
QQueue<QHostInfoRunnable*> scheduledLookups; // not yet started
QList<QHostInfoRunnable*> finishedLookups; // recently finished
QList<int> abortedLookups; // ids of aborted lookups
#if QT_CONFIG(thread)
QThreadPool threadPool;
#endif
QMutex mutex;
bool wasDeleted;
private:
void rescheduleWithMutexHeld();
};
QT_END_NAMESPACE
#endif // QHOSTINFO_P_H
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