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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** No Commercial Usage
**
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#include "qtlocalpeer.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QTime>
#if defined(Q_OS_WIN)
#include <QtCore/QLibrary>
#include <QtCore/qt_windows.h>
typedef BOOL(WINAPI*PProcessIdToSessionId)(DWORD,DWORD*);
static PProcessIdToSessionId pProcessIdToSessionId = 0;
#endif
#if defined(Q_OS_UNIX)
#include <time.h>
#include <unistd.h>
#endif
namespace SharedTools {
const char *QtLocalPeer::ack = "ack";
QtLocalPeer::QtLocalPeer(QObject *parent, const QString &appId)
: QObject(parent), id(appId)
{
if (id.isEmpty())
id = QCoreApplication::applicationFilePath(); //### On win, check if this returns .../argv[0] without casefolding; .\MYAPP == .\myapp on Win
QByteArray idc = id.toUtf8();
quint16 idNum = qChecksum(idc.constData(), idc.size());
//### could do: two 16bit checksums over separate halves of id, for a 32bit result - improved uniqeness probability. Every-other-char split would be best.
socketName = QLatin1String("qtsingleapplication-")
+ QString::number(idNum, 16);
#if defined(Q_OS_WIN)
if (!pProcessIdToSessionId) {
QLibrary lib("kernel32");
pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId");
}
if (pProcessIdToSessionId) {
DWORD sessionId = 0;
pProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
socketName += QLatin1Char('-') + QString::number(sessionId, 16);
}
#else
socketName += QLatin1Char('-') + QString::number(::getuid(), 16);
#endif
server = new QLocalServer(this);
QString lockName = QDir(QDir::tempPath()).absolutePath()
+ QLatin1Char('/') + socketName
+ QLatin1String("-lockfile");
lockFile.setFileName(lockName);
lockFile.open(QIODevice::ReadWrite);
}
bool QtLocalPeer::isClient()
{
if (lockFile.isLocked())
return false;
if (!lockFile.lock(QtLockedFile::WriteLock, false))
return true;
if (!QLocalServer::removeServer(socketName))
qWarning("QtSingleCoreApplication: could not cleanup socket");
bool res = server->listen(socketName);
if (!res)
qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection()));
return false;
}
bool QtLocalPeer::sendMessage(const QString &message, int timeout)
{
if (!isClient())
return false;
QLocalSocket socket;
bool connOk = false;
for (int i = 0; i < 2; i++) {
// Try twice, in case the other instance is just starting up
socket.connectToServer(socketName);
connOk = socket.waitForConnected(timeout/2);
if (connOk || i)
break;
int ms = 250;
#if defined(Q_OS_WIN)
Sleep(DWORD(ms));
#else
struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
nanosleep(&ts, NULL);
#endif
}
if (!connOk)
return false;
QByteArray uMsg(message.toUtf8());
QDataStream ds(&socket);
ds.writeBytes(uMsg.constData(), uMsg.size());
bool res = socket.waitForBytesWritten(timeout);
res &= socket.waitForReadyRead(timeout); // wait for ack
res &= (socket.read(qstrlen(ack)) == ack);
return res;
}
void QtLocalPeer::receiveConnection()
{
QLocalSocket* socket = server->nextPendingConnection();
if (!socket)
return;
// Why doesn't Qt have a blocking stream that takes care of this shait???
while (socket->bytesAvailable() < static_cast<int>(sizeof(quint32)))
socket->waitForReadyRead();
QDataStream ds(socket);
QByteArray uMsg;
quint32 remaining;
ds >> remaining;
uMsg.resize(remaining);
int got = 0;
char* uMsgBuf = uMsg.data();
//qDebug() << "RCV: remaining" << remaining;
do {
got = ds.readRawData(uMsgBuf, remaining);
remaining -= got;
uMsgBuf += got;
//qDebug() << "RCV: got" << got << "remaining" << remaining;
} while (remaining && got >= 0 && socket->waitForReadyRead(2000));
//### error check: got<0
if (got < 0) {
qWarning() << "QtLocalPeer: Message reception failed" << socket->errorString();
delete socket;
return;
}
// ### async this
QString message = QString::fromUtf8(uMsg.constData(), uMsg.size());
socket->write(ack, qstrlen(ack));
socket->waitForBytesWritten(1000);
delete socket;
emit messageReceived(message); // ##(might take a long time to return)
}
} // namespace SharedTools
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