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3rdparty: import KDSingleApplication

Browse Source 
This was removed (in favor of DBus activation) but DBus activation
does not work; re-import the latest version, now under the MIT
license. Pull in only src/ and the license file, though.

https://github.com/KDAB/KDSingleApplication
9dc8b2f61638aa1c4dbf49d38f8b97178974409f
This commit is contained in:
Adriaan de Groot 2022-06-26 21:59:53 +02:00
parent 3b9aa272f7
commit e80764a01e
10 changed files with 777 additions and 0 deletions
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.reuse/dep5
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@ -15,6 +15,10 @@ Files: man/calamares.8
License: GPL-3.0-or-later License: GPL-3.0-or-later
Copyright: 2017 Jonathan Carter <jcarter@linux.com> Copyright: 2017 Jonathan Carter <jcarter@linux.com>
Files: 3rdparty/kdsingleapplication/*
License: MIT
Copyright: Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@ kdab.com
### BUILD ARTIFACTS / NOT SOURCE ### BUILD ARTIFACTS / NOT SOURCE
# #
# QRC Files are basically build artifacts # QRC Files are basically build artifacts

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3rdparty/kdsingleapplication/CMakeLists.txt vendored Normal file
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set(KDSINGLEAPPLICATION_SRCS
kdsingleapplication.cpp
kdsingleapplication_localsocket.cpp)
set(KDSINGLEAPPLICATION_INSTALLABLE_INCLUDES
kdsingleapplication.h
kdsingleapplication_lib.h
)
set(KDSINGLEAPPLICATION_NON_INSTALLABLE_INCLUDES
kdsingleapplication_localsocket_p.h
)
if (${PROJECT_NAME}_STATIC)
add_library(kdsingleapplication STATIC ${KDSINGLEAPPLICATION_INSTALLABLE_INCLUDES} ${KDSINGLEAPPLICATION_SRCS})
target_compile_definitions(kdsingleapplication PUBLIC KDSINGLEAPPLICATION_STATIC_BUILD)
else()
add_library(kdsingleapplication SHARED ${KDSINGLEAPPLICATION_INSTALLABLE_INCLUDES} ${KDSINGLEAPPLICATION_SRCS})
target_compile_definitions(kdsingleapplication PRIVATE KDSINGLEAPPLICATION_SHARED_BUILD)
endif()
include(GNUInstallDirs)
set(KDSINGLEAPPLICATION_INCLUDEDIR ${CMAKE_INSTALL_INCLUDEDIR}/kdsingleapplication)
target_include_directories(kdsingleapplication
PUBLIC
$<INSTALL_INTERFACE:${KDSINGLEAPPLICATION_INCLUDEDIR}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}
)
if (WIN32)
target_link_libraries(kdsingleapplication kernel32)
endif()
target_link_libraries(kdsingleapplication Qt5::Core Qt5::Network)
install (FILES ${KDSINGLEAPPLICATION_INSTALLABLE_INCLUDES} DESTINATION ${KDSINGLEAPPLICATION_INCLUDEDIR})
install (TARGETS kdsingleapplication
EXPORT kdsingleapplicationTargets
RUNTIME DESTINATION bin
LIBRARY DESTINATION lib
ARCHIVE DESTINATION lib
)
include(CMakePackageConfigHelpers)
write_basic_package_version_file(
KDSingleApplicationConfigVersion.cmake
VERSION ${PACKAGE_VERSION}
COMPATIBILITY AnyNewerVersion
)
install(EXPORT kdsingleapplicationTargets
FILE KDSingleApplicationTargets.cmake
NAMESPACE KDAB::
DESTINATION lib/cmake/KDSingleApplication
)
configure_file(KDSingleApplicationConfig.cmake.in KDSingleApplicationConfig.cmake @ONLY)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/KDSingleApplicationConfig.cmake"
"${CMAKE_CURRENT_BINARY_DIR}/KDSingleApplicationConfigVersion.cmake"
DESTINATION lib/cmake/KDSingleApplication
)

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include(CMakeFindDependencyMacro)
find_dependency(Qt5Widgets REQUIRED)
find_dependency(Qt5Network REQUIRED)
# Add the targets file
include("${CMAKE_CURRENT_LIST_DIR}/KDSingleApplicationTargets.cmake")

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MIT License
Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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3rdparty/kdsingleapplication/kdsingleapplication.cpp vendored Normal file
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/*
MIT License
Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "kdsingleapplication.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QFileInfo>
// TODO: make this pluggable.
#include "kdsingleapplication_localsocket_p.h"
// Avoiding dragging in Qt private APIs for now, so this does not inherit
// from QObjectPrivate.
class KDSingleApplicationPrivate
{
public:
explicit KDSingleApplicationPrivate(const QString &name, KDSingleApplication *q);
void initialize();
QString name() const
{
return m_name;
}
bool isPrimaryInstance() const
{
return m_impl.isPrimaryInstance();
}
bool sendMessage(const QByteArray &message, int timeout)
{
return m_impl.sendMessage(message, timeout);
}
private:
Q_DECLARE_PUBLIC(KDSingleApplication)
KDSingleApplication *q_ptr;
QString m_name;
KDSingleApplicationLocalSocket m_impl;
};
KDSingleApplicationPrivate::KDSingleApplicationPrivate(const QString &name, KDSingleApplication *q)
: q_ptr(q)
, m_name(name)
, m_impl(name)
{
if (Q_UNLIKELY(name.isEmpty()))
qFatal("KDSingleApplication requires a non-empty application name");
if (isPrimaryInstance()) {
QObject::connect(&m_impl, &KDSingleApplicationLocalSocket::messageReceived,
q, &KDSingleApplication::messageReceived);
}
}
static QString extractExecutableName(const QString &applicationFilePath)
{
return QFileInfo(applicationFilePath).fileName();
}
KDSingleApplication::KDSingleApplication(QObject *parent)
: KDSingleApplication(extractExecutableName(QCoreApplication::applicationFilePath()), parent)
{
}
KDSingleApplication::KDSingleApplication(const QString &name, QObject *parent)
: QObject(parent)
, d_ptr(new KDSingleApplicationPrivate(name, this))
{
}
QString KDSingleApplication::name() const
{
Q_D(const KDSingleApplication);
return d->name();
}
bool KDSingleApplication::isPrimaryInstance() const
{
Q_D(const KDSingleApplication);
return d->isPrimaryInstance();
}
bool KDSingleApplication::sendMessage(const QByteArray &message)
{
return sendMessageWithTimeout(message, 5000);
}
bool KDSingleApplication::sendMessageWithTimeout(const QByteArray &message, int timeout)
{
Q_ASSERT(!isPrimaryInstance());
Q_D(KDSingleApplication);
return d->sendMessage(message, timeout);
}
KDSingleApplication::~KDSingleApplication() = default;

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/*
MIT License
Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef KDSINGLEAPPLICATION_H
#define KDSINGLEAPPLICATION_H
#include <QtCore/QObject>
#include <memory>
#include "kdsingleapplication_lib.h"
class KDSingleApplicationPrivate;
class KDSINGLEAPPLICATION_EXPORT KDSingleApplication : public QObject
{
Q_OBJECT
Q_PROPERTY(QString name READ name CONSTANT)
Q_PROPERTY(bool isPrimaryInstance READ isPrimaryInstance CONSTANT)
public:
explicit KDSingleApplication(QObject *parent = nullptr);
explicit KDSingleApplication(const QString &name, QObject *parent = nullptr);
~KDSingleApplication();
QString name() const;
bool isPrimaryInstance() const;
public Q_SLOTS:
// avoid default arguments and overloads, as they don't mix with connections
bool sendMessage(const QByteArray &message);
bool sendMessageWithTimeout(const QByteArray &message, int timeout);
Q_SIGNALS:
void messageReceived(const QByteArray &message);
private:
Q_DECLARE_PRIVATE(KDSingleApplication)
std::unique_ptr<KDSingleApplicationPrivate> d_ptr;
};
#endif // KDSINGLEAPPLICATION_H

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/*
MIT License
Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef KDSINGLEAPPLICATION_LIB_H
#define KDSINGLEAPPLICATION_LIB_H
#include <QtCore/QtGlobal>
#if defined(KDSINGLEAPPLICATION_STATIC_BUILD)
#define KDSINGLEAPPLICATION_EXPORT
#elif defined(KDSINGLEAPPLICATION_SHARED_BUILD)
#define KDSINGLEAPPLICATION_EXPORT Q_DECL_EXPORT
#else
#define KDSINGLEAPPLICATION_EXPORT Q_DECL_IMPORT
#endif
#endif // KDSINGLEAPPLICATION_LIB_H

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/*
MIT License
Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "kdsingleapplication_localsocket_p.h"
#include <QtCore/QDir>
#include <QtCore/QDeadlineTimer>
#include <QtCore/QTimer>
#include <QtCore/QLockFile>
#include <QtCore/QDataStream>
#include <QtCore/QtDebug>
#include <QtCore/QLoggingCategory>
#include <QtNetwork/QLocalServer>
#include <QtNetwork/QLocalSocket>
#include <chrono>
#include <algorithm>
#if defined(Q_OS_UNIX)
// for ::getuid()
#include <sys/types.h>
#include <unistd.h>
#endif
#if defined(Q_OS_WIN)
#include <qt_windows.h>
#endif
static const auto LOCALSOCKET_CONNECTION_TIMEOUT = std::chrono::seconds(5);
static const char LOCALSOCKET_PROTOCOL_VERSION = 2;
Q_LOGGING_CATEGORY(kdsaLocalSocket, "kdsingleapplication.localsocket", QtWarningMsg);
KDSingleApplicationLocalSocket::KDSingleApplicationLocalSocket(const QString &name, QObject *parent)
: QObject(parent)
{
#if defined(Q_OS_UNIX)
m_socketName = QStringLiteral("kdsingleapp-%1-%2-%3")
.arg(::getuid())
.arg(qEnvironmentVariable("XDG_SESSION_ID"), name);
#elif defined(Q_OS_WIN)
// I'm not sure of a "global session identifier" on Windows; are
// multiple logins from the same user a possibility? For now, following this:
// https://docs.microsoft.com/en-us/windows/desktop/devnotes/getting-the-session-id-of-the-current-process
DWORD sessionId;
BOOL haveSessionId = ProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
m_socketName = QString::fromUtf8("kdsingleapp-%1-%2")
.arg(haveSessionId ? sessionId : 0)
.arg(name);
#else
#error "KDSingleApplication has not been ported to this platform"
#endif
const QString lockFilePath =
QDir::tempPath() + QLatin1Char('/') + m_socketName + QLatin1String(".lock");
qCDebug(kdsaLocalSocket) << "Socket name is" << m_socketName;
qCDebug(kdsaLocalSocket) << "Lock file path is" << lockFilePath;
std::unique_ptr<QLockFile> lockFile(new QLockFile(lockFilePath));
lockFile->setStaleLockTime(0);
if (!lockFile->tryLock()) {
// someone else has the lock => we're secondary
return;
}
std::unique_ptr<QLocalServer> server = std::make_unique<QLocalServer>();
if (!server->listen(m_socketName)) {
// maybe the primary crashed, leaving a stale socket; delete it and try again
QLocalServer::removeServer(m_socketName);
if (!server->listen(m_socketName)) {
// TODO: better error handling.
qWarning("KDSingleApplication: unable to make the primary instance listen on %ls: %ls",
qUtf16Printable(m_socketName),
qUtf16Printable(server->errorString()));
return;
}
}
connect(server.get(), &QLocalServer::newConnection,
this, &KDSingleApplicationLocalSocket::handleNewConnection);
m_lockFile = std::move(lockFile);
m_localServer = std::move(server);
}
KDSingleApplicationLocalSocket::~KDSingleApplicationLocalSocket() = default;
bool KDSingleApplicationLocalSocket::isPrimaryInstance() const
{
return m_localServer != nullptr;
}
bool KDSingleApplicationLocalSocket::sendMessage(const QByteArray &message, int timeout)
{
Q_ASSERT(!isPrimaryInstance());
QLocalSocket socket;
qCDebug(kdsaLocalSocket) << "Preparing to send message" << message << "with timeout" << timeout;
QDeadlineTimer deadline(timeout);
// There is an inherent race here with the setup of the server side.
// Even if the socket lock is held by the server, the server may not
// be listening yet. So this connection may fail; keep retrying
// until we hit the timeout.
do {
socket.connectToServer(m_socketName);
if (socket.waitForConnected(deadline.remainingTime()))
break;
} while (!deadline.hasExpired());
qCDebug(kdsaLocalSocket) << "Socket state:" << socket.state() << "Timer remaining" << deadline.remainingTime() << "Expired?" << deadline.hasExpired();
if (deadline.hasExpired())
return false;
socket.write(&LOCALSOCKET_PROTOCOL_VERSION, 1);
{
QByteArray encodedMessage;
QDataStream ds(&encodedMessage, QIODevice::WriteOnly);
ds << message;
socket.write(encodedMessage);
}
qCDebug(kdsaLocalSocket) << "Wrote message in the socket" << "Timer remaining" << deadline.remainingTime() << "Expired?" << deadline.hasExpired();
// There is no acknowledgement mechanism here.
// Should there be one?
while (socket.bytesToWrite() > 0) {
if (!socket.waitForBytesWritten(deadline.remainingTime()))
return false;
}
qCDebug(kdsaLocalSocket) << "Bytes written, now disconnecting" << "Timer remaining" << deadline.remainingTime() << "Expired?" << deadline.hasExpired();
socket.disconnectFromServer();
if (socket.state() == QLocalSocket::UnconnectedState)
return true;
if (!socket.waitForDisconnected(deadline.remainingTime()))
return false;
qCDebug(kdsaLocalSocket) << "Disconnected -- success!";
return true;
}
void KDSingleApplicationLocalSocket::handleNewConnection()
{
Q_ASSERT(m_localServer);
QLocalSocket *socket = m_localServer->nextPendingConnection();
qCDebug(kdsaLocalSocket) << "Got new connection on" << m_socketName << "state" << socket->state();
Connection c(socket);
c.readDataConnection = QObjectConnectionHolder(
connect(c.socket.get(), &QLocalSocket::readyRead,
this, &KDSingleApplicationLocalSocket::readDataFromSecondary));
c.secondaryDisconnectedConnection = QObjectConnectionHolder(
connect(c.socket.get(), &QLocalSocket::disconnected,
this, &KDSingleApplicationLocalSocket::secondaryDisconnected));
c.abortConnection = QObjectConnectionHolder(
connect(c.timeoutTimer.get(), &QTimer::timeout,
this, &KDSingleApplicationLocalSocket::abortConnectionToSecondary));
m_clients.push_back(std::move(c));
// Note that by the time we get here, the socket could've already been closed,
// and no signals emitted (hello, Windows!). Read what's already in the socket.
if (readDataFromSecondarySocket(socket))
return;
if (socket->state() == QLocalSocket::UnconnectedState)
secondarySocketDisconnected(socket);
}
template <typename Container>
static auto findConnectionBySocket(Container &container, QLocalSocket *socket)
{
auto i = std::find_if(container.begin(),
container.end(),
[socket](const auto &c) { return c.socket.get() == socket; });
Q_ASSERT(i != container.end());
return i;
}
template <typename Container>
static auto findConnectionByTimer(Container &container, QTimer *timer)
{
auto i = std::find_if(container.begin(),
container.end(),
[timer](const auto &c) { return c.timeoutTimer.get() == timer; });
Q_ASSERT(i != container.end());
return i;
}
void KDSingleApplicationLocalSocket::readDataFromSecondary()
{
QLocalSocket *socket = static_cast<QLocalSocket *>(sender());
readDataFromSecondarySocket(socket);
}
bool KDSingleApplicationLocalSocket::readDataFromSecondarySocket(QLocalSocket *socket)
{
auto i = findConnectionBySocket(m_clients, socket);
Connection &c = *i;
c.readData.append(socket->readAll());
qCDebug(kdsaLocalSocket) << "Got more data from a secondary. Data read so far:" << c.readData;
const QByteArray &data = c.readData;
if (data.size() >= 1) {
if (data[0] != LOCALSOCKET_PROTOCOL_VERSION) {
qCDebug(kdsaLocalSocket) << "Got an invalid protocol version";
m_clients.erase(i);
return true;
}
}
QDataStream ds(data);
ds.skipRawData(1);
ds.startTransaction();
QByteArray message;
ds >> message;
if (ds.commitTransaction()) {
qCDebug(kdsaLocalSocket) << "Got a complete message:" << message;
Q_EMIT messageReceived(message);
m_clients.erase(i);
return true;
}
return false;
}
void KDSingleApplicationLocalSocket::secondaryDisconnected()
{
QLocalSocket *socket = static_cast<QLocalSocket *>(sender());
secondarySocketDisconnected(socket);
}
void KDSingleApplicationLocalSocket::secondarySocketDisconnected(QLocalSocket *socket)
{
auto i = findConnectionBySocket(m_clients, socket);
Connection c = std::move(*i);
m_clients.erase(i);
qCDebug(kdsaLocalSocket) << "Secondary disconnected. Data read:" << c.readData;
}
void KDSingleApplicationLocalSocket::abortConnectionToSecondary()
{
QTimer *timer = static_cast<QTimer *>(sender());
auto i = findConnectionByTimer(m_clients, timer);
Connection c = std::move(*i);
m_clients.erase(i);
qCDebug(kdsaLocalSocket) << "Secondary timed out. Data read:" << c.readData;
}
KDSingleApplicationLocalSocket::Connection::Connection(QLocalSocket *socket)
: socket(socket)
, timeoutTimer(new QTimer)
{
timeoutTimer->start(LOCALSOCKET_CONNECTION_TIMEOUT);
}

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/*
MIT License
Copyright (C) 2019-2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef KDSINGLEAPPLICATION_LOCALSOCKET_P_H
#define KDSINGLEAPPLICATION_LOCALSOCKET_P_H
#include <QtCore/QObject>
#include <QtCore/QByteArray>
#include <QtCore/QString>
QT_BEGIN_NAMESPACE
class QLockFile;
class QLocalServer;
class QLocalSocket;
class QTimer;
QT_END_NAMESPACE
#include <memory>
#include <vector>
struct QObjectDeleteLater
{
void operator()(QObject *o) { o->deleteLater(); }
};
class QObjectConnectionHolder
{
Q_DISABLE_COPY(QObjectConnectionHolder)
QMetaObject::Connection c;
public:
QObjectConnectionHolder() {}
explicit QObjectConnectionHolder(QMetaObject::Connection c)
: c(std::move(c))
{
}
~QObjectConnectionHolder()
{
QObject::disconnect(c);
}
QObjectConnectionHolder(QObjectConnectionHolder &&other) noexcept
: c(std::exchange(other.c, {}))
{}
QObjectConnectionHolder &operator=(QObjectConnectionHolder &&other) noexcept
{
QObjectConnectionHolder moved(std::move(other));
swap(moved);
return *this;
}
void swap(QObjectConnectionHolder &other) noexcept
{
using std::swap;
swap(c, other.c);
}
};
class KDSingleApplicationLocalSocket : public QObject
{
Q_OBJECT
public:
explicit KDSingleApplicationLocalSocket(const QString &name,
QObject *parent = nullptr);
~KDSingleApplicationLocalSocket();
bool isPrimaryInstance() const;
public Q_SLOTS:
bool sendMessage(const QByteArray &message, int timeout);
Q_SIGNALS:
void messageReceived(const QByteArray &message);
private:
void handleNewConnection();
void readDataFromSecondary();
bool readDataFromSecondarySocket(QLocalSocket *socket);
void secondaryDisconnected();
void secondarySocketDisconnected(QLocalSocket *socket);
void abortConnectionToSecondary();
QString m_socketName;
std::unique_ptr<QLockFile> m_lockFile; // protects m_localServer
std::unique_ptr<QLocalServer> m_localServer;
struct Connection {
explicit Connection(QLocalSocket *s);
std::unique_ptr<QLocalSocket, QObjectDeleteLater> socket;
std::unique_ptr<QTimer, QObjectDeleteLater> timeoutTimer;
QByteArray readData;
// socket/timeoutTimer are deleted via deleteLater (as we delete them
// in slots connected to their signals). Before the deleteLater is acted upon,
// they may emit further signals, triggering logic that it's not supposed
// to be triggered (as the Connection has already been destroyed).
// Use this Holder to break the connections.
QObjectConnectionHolder readDataConnection;
QObjectConnectionHolder secondaryDisconnectedConnection;
QObjectConnectionHolder abortConnection;
};
std::vector<Connection> m_clients;
};
#endif // KDSINGLEAPPLICATION_LOCALSOCKET_P_H

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include(../common.pri)
TEMPLATE = lib
TARGET = kdsingleapplication
QT = core network
CONFIG += static
SOURCES += \
kdsingleapplication.cpp \
kdsingleapplication_localsocket.cpp \
HEADERS += \
kdsingleapplication.h \
kdsingleapplication_lib.h \
kdsingleapplication_localsocket_p.h \
DEFINES += \
KDSINGLEAPPLICATION_BUILD
win32:LIBS += -lkernel32