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/*
Copyright (C) 2012 Sebastian Herbord. All rights reserved.
This file is part of Mod Organizer.
Mod Organizer is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Mod Organizer 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Mod Organizer. If not, see <http://www.gnu.org/licenses/>.
*/
#include "singleinstance.h"
#include "utility.h"
#include <report.h>
#include <log.h>
#include <QLocalSocket>
static const char s_Key[] = "mo-43d1a3ad-eeb0-4818-97c9-eda5216c29b5";
static const int s_Timeout = 5000;
using MOBase::reportError;
SingleInstance::SingleInstance(Flags flags, QObject *parent) :
QObject(parent), m_Ephemeral(false), m_OwnsSM(false)
{
m_SharedMem.setKey(s_Key);
if (!m_SharedMem.create(1)) {
if (flags.testFlag(ForcePrimary)) {
while (m_SharedMem.error() == QSharedMemory::AlreadyExists) {
Sleep(500);
if (m_SharedMem.create(1)) {
m_OwnsSM = true;
break;
}
}
}
if (m_SharedMem.error() == QSharedMemory::AlreadyExists) {
if (!flags.testFlag(AllowMultiple)) {
m_SharedMem.attach();
m_Ephemeral = true;
}
}
if ((m_SharedMem.error() != QSharedMemory::NoError) &&
(m_SharedMem.error() != QSharedMemory::AlreadyExists)) {
throw MOBase::MyException(tr("SHM error: %1").arg(m_SharedMem.errorString()));
}
} else {
m_OwnsSM = true;
}
if (m_OwnsSM) {
connect(&m_Server, SIGNAL(newConnection()), this, SLOT(receiveMessage()), Qt::QueuedConnection);
// has to be called before listen
m_Server.setSocketOptions(QLocalServer::WorldAccessOption);
m_Server.listen(s_Key);
}
}
void SingleInstance::sendMessage(const QString &message)
{
if (m_OwnsSM) {
// nobody there to receive the message
return;
}
QLocalSocket socket(this);
bool connected = false;
for(int i = 0; i < 2 && !connected; ++i) {
if (i > 0) {
Sleep(250);
}
// other instance may be just starting up
socket.connectToServer(s_Key, QIODevice::WriteOnly);
connected = socket.waitForConnected(s_Timeout);
}
if (!connected) {
reportError(tr("failed to connect to running instance: %1").arg(socket.errorString()));
return;
}
socket.write(message.toUtf8());
if (!socket.waitForBytesWritten(s_Timeout)) {
reportError(tr("failed to communicate with running instance: %1").arg(socket.errorString()));
return;
}
socket.disconnectFromServer();
socket.waitForDisconnected();
}
void SingleInstance::receiveMessage()
{
QLocalSocket *socket = m_Server.nextPendingConnection();
if (!socket) {
return;
}
if (!socket->waitForReadyRead(s_Timeout)) {
// check if there are bytes available; if so, it probably means the data was
// already received by the time waitForReadyRead() was called and the
// connection has been closed
const auto av = socket->bytesAvailable();
if (av <= 0) {
MOBase::log::error(
"failed to receive data from secondary instance: {}",
socket->errorString());
reportError(tr("failed to receive data from secondary instance: %1").arg(socket->errorString()));
return;
}
}
QString message = QString::fromUtf8(socket->readAll().constData());
emit messageSent(message);
socket->disconnectFromServer();
}
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