Symfony execution of long running script

Question

I am using Symfony2 and I want to run a long script written in C++ (for example 60 minutes).

Now I do it via shell_exec():

$pid = shell_exec('nohup my/program/written/in/c++.out some arguments > /dev/null 2>/dev/null & echo $!');

If I keep refreshing a page the script runs fine, but if I go AFK the script is terminated with process of PHP server (/usr/bin/php-cgi).

Is there a way to isolate C++ program from PHP server process? With nohup the process has ppid = 1, so it should be isolated, but it is not.

consider using a symfony console command ... looks like you´re calling shell_exec() in a controller action which will terminate with terminating the http request AFAIK — john Smith
– john Smith, Commented Apr 20, 2015 at 13:53

luchaninov · Accepted Answer · 2016-05-26 18:41:28Z

2

You can look at the Symfony Process Component : http://symfony.com/doc/current/components/process.html

$process = new Process('nohup my/program/written/in/c++.out some arguments');
$process->run();

You will be able to run your process.

edited May 26, 2016 at 18:41

luchaninov

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answered Apr 20, 2015 at 14:43

Benjamin Lazarecki

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2 Comments

H.W. Over a year ago

But this waits until the process is finished. Am I right? It is not good for long running processes.

Christian Over a year ago

@H.W. You can use $process->start(); to run in background, however if the scripts ends (or, more accurately, if $process destructor is called), then the process will be killed. If your script will definitely have to quit before the process finishes, use something like nohup <your command> (on linux). You'll still have to make sure $process is not garbage collected, so store it somewhere safely. ;)

Evgeniy Kuzmin · Accepted Answer · 2015-04-20 15:13:19Z

You can create symfony2 console command "myapp:my-command-name" that will run your c++ command

class MyStandaloneCommand extends ContainerAwareCommand
{
    protected function configure()
    {
        $this->setName('myapp:my-command-name')
            ->setDescription('Will run standalone c++')
            ->addArgument('arg1', InputArgument::REQUIRED, 'Some arg');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {   
        $arg1 = $input->getArgument('arg1');
        $result = shell_exec('nohup my/program/written/in/c++.out '.$arg1.' 2>&1');

        $output->writeln('My cool command is started');

        return true;
    }

}

Then use JMSJobBundle
http://jmsyst.com/bundles/JMSJobQueueBundle/master/installation

Where you can create a queue of you console commands something like:

class HomeController ... {
 // inject service here
 private $cronJobHelper;
 // inject EM here
 private $em;
public function indexAction(){

 $job = $this->cronJobHelper->createConsoleJob('myapp:my-command-name', $event->getId(), 10);
        $this->em->persist($job);
 $this->em->persist($job);
$this->em->flush();
}


use JMS\JobQueueBundle\Entity\Job;

class CronJobHelper{

    public function createConsoleJob($consoleFunction, $params, $delayToRunInSeconds, $priority = Job::PRIORITY_DEFAULT, $queue = Job::DEFAULT_QUEUE){
        if(!is_array($params)){
            $params = [$params];
        }

        $job = new Job($consoleFunction, $params, 1, $queue, $priority);
        $date = $job->getExecuteAfter();
        $date = new \DateTime('now');
        $date->setTimezone(new \DateTimeZone('UTC')); //just in case
        $date->add(new \DateInterval('PT'.$delayToRunInSeconds.'S')); 
        $job->setExecuteAfter($date);

        return $job;
    }
}

Cool, but it would be cooler to use symfony/process instead of shell_exec(). ;) One known "feature" from that function is that STDOUT and STDERR of the executed program is redirect to the owning PHP process, something most people wouldn't want.

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