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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 <unistd.h> //for getlogin()
LSingleApplication::LSingleApplication(int &argc, char **argv) : QApplication(argc, argv){
//Initialize a couple convenience internal variables
cfile = QDir::tempPath()+"/.LSingleApp-%1-%2";
QString username = QString(getlogin());
QString appname = this->applicationName();
//Obscure the user/app in the filename (TO DO)
//qDebug() << username << appname;
//bool junk;
//qDebug() << QString::number( username.toInt(&junk,16) );
cfile = cfile.arg( username, appname );
lockfile = new QLockFile(cfile+"-lock");
lockfile->setStaleLockTime(0); //long-lived processes
for(int i=1; i<argc; i++){ inputlist << QString(argv[i]); }
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() << " - Stale Lock";
lockfile->removeStaleLockFile();
//Now re-try to create the lock
primary = lockfile->tryLock();
//qDebug() << " - Try Lock Again:" << primary;
}
}
if(primary){
//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) ){
lserver->setSocketOptions(QLocalServer::UserAccessOption);
//qDebug() << " - Success";
isActive = true;
}else{
//qDebug() << " - Failure:" << lserver->errorString();
lockfile->unlock();
}
}else{
//forward the current inputs to the locked process for processing and exit
//qDebug() << "Forward inputs to locking process:" << inputlist;
QLocalSocket socket(this);
socket.connectToServer(cfile);
socket.waitForConnected();
if(!socket.isValid()){ exit(1); } //error - could not forward info
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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