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/*
* Copyright (C) 2008-2021 The QXmpp developers
*
* Author:
* Linus Jahn
*
* Source:
* https://github.com/qxmpp-project/qxmpp
*
* This file is a part of QXmpp library.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
*/
#ifndef QXMPPFUTUREUTILS_P_H
#define QXMPPFUTUREUTILS_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the QXmpp API. This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//
#include <QXmppIq.h>
#include <memory>
#include <variant>
#include <QFutureWatcher>
#include <QObject>
namespace QXmpp::Private {
// helper for std::visit
template<class... Ts>
struct overloaded : Ts... {
using Ts::operator()...;
};
// explicit deduction guide (not needed as of C++20)
template<class... Ts>
overloaded(Ts...) -> overloaded<Ts...>;
template<typename F, typename Ret, typename A, typename... Rest>
A lambda_helper(Ret (F::*)(A, Rest...));
template<typename F, typename Ret, typename A, typename... Rest>
A lambda_helper(Ret (F::*)(A, Rest...) const);
template<typename F>
struct first_argument {
using type = decltype(lambda_helper(&F::operator()));
};
template<typename F>
using first_argument_t = typename first_argument<F>::type;
template<typename T>
QFuture<T> makeReadyFuture(T &&value)
{
QFutureInterface<T> interface(QFutureInterfaceBase::Started);
interface.reportResult(std::move(value));
interface.reportFinished();
return interface.future();
}
inline QFuture<void> makeReadyFuture()
{
using State = QFutureInterfaceBase::State;
return QFutureInterface<void>(State(State::Started | State::Finished)).future();
}
template<typename T, typename Handler>
void awaitLast(const QFuture<T> &future, QObject *context, Handler handler)
{
auto *watcher = new QFutureWatcher<T>(context);
QObject::connect(watcher, &QFutureWatcherBase::finished,
context, [watcher, handler { std::move(handler) }]() {
auto future = watcher->future();
handler(future.resultAt(future.resultCount() - 1));
watcher->deleteLater();
});
watcher->setFuture(future);
}
template<typename T, typename Handler>
void await(const QFuture<T> &future, QObject *context, Handler handler)
{
auto *watcher = new QFutureWatcher<T>(context);
QObject::connect(watcher, &QFutureWatcherBase::finished,
context, [watcher, handler { std::move(handler) }]() {
handler(watcher->result());
watcher->deleteLater();
});
watcher->setFuture(future);
}
template<typename Handler>
void await(const QFuture<void> &future, QObject *context, Handler handler)
{
auto *watcher = new QFutureWatcher<void>(context);
QObject::connect(watcher, &QFutureWatcherBase::finished,
context, [watcher, handler { std::move(handler) }]() {
handler();
watcher->deleteLater();
});
watcher->setFuture(future);
}
template<typename Result, typename Input, typename Converter>
auto chain(QFuture<Input> &&source, QObject *context, Converter task) -> QFuture<Result>
{
auto resultInterface = std::make_shared<QFutureInterface<Result>>(QFutureInterfaceBase::Started);
auto *watcher = new QFutureWatcher<Input>(context);
QObject::connect(watcher, &QFutureWatcherBase::finished, context, [=]() {
resultInterface->reportResult(task(watcher->result()));
resultInterface->reportFinished();
watcher->deleteLater();
});
watcher->setFuture(source);
return resultInterface->future();
}
template<typename IqType, typename Input, typename Converter>
auto parseIq(Input &&sendResult, Converter convert) -> decltype(convert({}))
{
using Result = decltype(convert({}));
return std::visit(overloaded {
[convert { std::move(convert) }](const QDomElement &element) -> Result {
IqType iq;
iq.parse(element);
if (iq.type() == QXmppIq::Error) {
return iq.error();
}
return convert(std::move(iq));
},
[](QXmpp::PacketState) -> Result {
using Error = QXmppStanza::Error;
return Error(Error::Wait, Error::UndefinedCondition,
QStringLiteral("Couldn't send request: lost connection."));
},
},
sendResult);
}
template<typename IqType, typename Result, typename Input>
auto parseIq(Input &&sendResult) -> Result
{
return parseIq<IqType>(std::move(sendResult), [](IqType &&iq) -> Result {
// no conversion
return iq;
});
}
template<typename Input, typename Converter>
auto chainIq(QFuture<Input> &&input, QObject *context, Converter convert) -> QFuture<decltype(convert({}))>
{
using Result = decltype(convert({}));
using IqType = std::decay_t<first_argument_t<Converter>>;
return chain<Result>(std::move(input), context, [convert { std::move(convert) }](Input &&input) -> Result {
return parseIq<IqType>(std::move(input), convert);
});
}
template<typename Result, typename Input>
auto chainIq(QFuture<Input> &&input, QObject *context) -> QFuture<Result>
{
// IQ type is first std::variant parameter
using IqType = std::decay_t<decltype(std::get<0>(Result {}))>;
return chain<Result>(std::move(input), context, [](Input &&sendResult) {
return parseIq<IqType, Result>(sendResult);
});
}
}
#endif // QXMPPFUTUREUTILS_P_H
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