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//===========================================
// Lumina-DE source code
// Copyright (c) 2014, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
#include "LuminaSingleApplication.h"
#include <QDir>
#include <QFile>
#include <QLocalSocket>
#include <QDebug>
#include <QX11Info>
#include <unistd.h> //for getlogin()
LSingleApplication::LSingleApplication(int &argc, char **argv, QString appname) : QApplication(argc, argv){
//Load the proper translation systems
cTrans = LUtils::LoadTranslation(this, appname); //save the translator for later
//Initialize a couple convenience internal variables
cfile = QDir::tempPath()+"/.LSingleApp-%1-%2-%3";
QString username = QString(getlogin());
//For locking the process use the official process name - not the user input (no masking)
appname = this->applicationName();
cfile = cfile.arg( username, appname, QString::number(QX11Info::appScreen()) );
lockfile = new QLockFile(cfile+"-lock");
lockfile->setStaleLockTime(0); //long-lived processes
for(int i=1; i<argc; i++){
QString path = QString::fromLocal8Bit(argv[i]);
//do few quick conversions for relative paths and such as necessary
// (Remember: this is only used for secondary processes, not the primary)
if(path=="."){
//Insert the current working directory instead
path = QDir::currentPath();
}else{
if(!path.startsWith("/") && !path.startsWith("-") ){ path.prepend(QDir::currentPath()+"/"); }
}
inputlist << path;
}
isActive = false;
lserver = 0;
PerformLockChecks();
}
LSingleApplication::~LSingleApplication(){
if(lserver != 0 && lockfile->isLocked() ){
//currently locked instance: remove the lock now
lserver->close();
QLocalServer::removeServer(cfile);
lockfile->unlock();
}
}
bool LSingleApplication::isPrimaryProcess(){
return isActive;
}
void LSingleApplication::PerformLockChecks(){
bool primary = lockfile->tryLock();
//qDebug() << "Try Lock: " << primary;
if(!primary){
//Pre-existing lock - check it for validity
QString appname, hostname;
qint64 pid;
lockfile->getLockInfo(&pid, &hostname, &appname); //PID already exists if it gets this far, ignore hostname
//qDebug() << " - Lock Info:" << pid << hostname << appname;
if( appname!=this->applicationName() || !QFile::exists(cfile) ){
//Some other process has the same PID or the server does not exist - stale lock
qDebug() << " - Cleaning stale single-instance lock:";
if(lockfile->removeStaleLockFile() ){
if(QFile::exists(cfile)){ QLocalServer::removeServer(cfile); } //also remove stale socket/server file
}else{
qDebug() << " -- Could not remove lock file";
}
//Now re-try to create the lock
primary = lockfile->tryLock();
//qDebug() << " - Try Lock Again:" << primary;
}
}
if(primary || !QFile::exists(cfile) ){
//Create the server socket
//qDebug() << "Create Local Server";
if(QFile::exists(cfile)){ QLocalServer::removeServer(cfile); } //stale socket/server file
lserver = new QLocalServer(this);
connect(lserver, SIGNAL(newConnection()), this, SLOT(newInputsAvailable()) );
if( lserver->listen(cfile) ){
qDebug() << " - Created new single-instance lock";
lserver->setSocketOptions(QLocalServer::UserAccessOption);
//qDebug() << " - Success";
isActive = true;
}else{
qDebug() << " - WARNING: Could not create single-instance framework";
qDebug() << " - Falling back on standard application startup";
lockfile->unlock();
isActive = true;
}
}else{
//forward the current inputs to the locked process for processing and exit
//Check the connection to the local server first
qDebug() << "Single-instance lock found";
QLocalSocket socket(this);
socket.connectToServer(cfile);
socket.waitForConnected();
if(!socket.isValid() || socket.state()!=QLocalSocket::ConnectedState){
//error - could not forward info for some reason
qDebug() << " - Could not connect to locking process: exiting...";
exit(1);
}
qDebug() << " - Forwarding inputs to locking process and closing down this instance...";
socket.write( inputlist.join("::::").toLocal8Bit() );
socket.waitForDisconnected(500); //max out at 1/2 second (only hits this if no inputs)
}
}
//New messages detected
void LSingleApplication::newInputsAvailable(){
while(lserver->hasPendingConnections()){
QLocalSocket *sock = lserver->nextPendingConnection();
QByteArray bytes;
sock->waitForReadyRead();
while(sock->bytesAvailable() > 0){ //if(sock->waitForReadyRead()){
//qDebug() << "Info Available";
bytes.append( sock->readAll() );
}
sock->disconnectFromServer();
QStringList inputs = QString::fromLocal8Bit(bytes).split("::::");
//qDebug() << " - New Inputs Detected:" << inputs;
emit InputsAvailable(inputs);
}
}
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