MshavliukSignalEventsBundle

About

This bundle provides service, that emits events for every handled UNIX signals into your Symfony application. It relies on PCNTL php-extension, which you can check by running

$ php --ri pcntl

Expected output:

pcntl
pcntl support => enabled

Installation

Add the mshavliuk/mshavliuk-signal-events-bundle package to your require section in the composer.json file.

$ composer require mshavliuk/mshavliuk-signal-events-bundle

Usage

Automatic startup

By default it will handle every possible signals and startup after console.command event which is basically in every php bin/console run.

Configure the bundle in your config.yml:

mshavliuk_signal_events:
    startup_events:
        - console.command       # to handle signals while console commands (default)
        - kernel.request        # to handle signals while requests processing
    handle_signals:
        - SIGINT                # ctrl+c
        - SIGTSTP               # ctrl+z

Manual

To prevent automatic startup you can specify empty arrays for startup_events config:

mshavliuk_signal_events:
    startup_events: []      # prevent startup

In that case you can manually inject Mshavliuk\MshavliukSignalEventsBundle\Service\SignalHandlerService and configure signals to handle:

public function __construct(SignalHandlerService $service)
{
    $service->addObservableSignals(['SIGINT', 'SIGHUP']);
}

Handling signal events

You can register any callback function to handle specific event via EventDispatcherInterface::addListener function. See the following example:

$eventDispatcher->addListener(SignalEvent::NAME, function($event, $eventName) use ($output) {
    if($event->getSignal() === SIGINT) {
        $output->writeln('Ctrl+C signal handled');
    }
});

Also you can create special listener class and bind its public method for process any signals:

services.yaml:

App\EventListener\SignalListener:
    tags:
        - { name: kernel.event_listener, event: signal.handled, method: onSignal }

SignalListener.php:

class SignalListener
{
    protected $logger;

    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }


    public function onSignal($event)
    {
        $this->logger->info('handle signal event', ['event' => $event]);
    }
}

For more information read the official Symfony documentation.

License

See LICENSE.