dterumalai

Software Engineer at SIB - Swiss Institute of Bioinformatics

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Geneva

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Level 1
1,050 XP
Apr
09
4 weeks ago
Activity icon

Started a new Conversation Listening To Events Inside An Artisan Command

Hi, I created a directory watcher as an artisan command to be able to monitor new files based on inotify. I had in mind that I wanted to be able to stop the command either by catching the SIGINT signal or by issuing an event which would stop the command.

php artisan watch => Start the watcher (Can be quit by using Ctrl+C)

But if you add &

php artisan watch & => You cannot quit easily (You can with kill, I know)

So my idea, was to design a second command

php artisan watch:stop => emit a stop watcher event and because php artisan watch command is listening to this event, it should stop.

I even went further by thinking about a php artisan watch:restart in case of... But that's not the topic

Unfortunately, the watch command doesn't seem to be able to catch the event and therefore, never stops.

Here's the main function of the watch command:

public function handle(): void
    {
        $this->line("<info>Starting directory watcher:</info>");

        $this->startProcess();

        $this->startWatchers();

        $this->listenForEvents();

        while (true) {
            $events = inotify_read($this->inotify);

            if (!empty($events)) {
                foreach ($events as $event) {
                    $filename = $event['name'];
                    //Handle file ...
                }
            }
            sleep($this->interval);

            if($this->shouldRestart) {
                $this->restartWatchers();
            }

            if ($this->shouldQuit) {
                $this->stopProcess();
                break;
            }
        }
    }

My listenForEvents()function is defined as such:

protected function listenForEvents(): void
    {
        $this->laravel['events']->listen(WatcherStopping::class, function ($event) {
            $this->writeOutput('stopping');
            $this->shouldQuit = true;
        });

        $this->laravel['events']->listen(WatcherRestarted::class, function ($event) {
            $this->writeOutput('restarted');
            $this->shouldRestart = true;
        });

    }

Here is my StopCommandmain class:

/**
     * Execute the console command.
     *
     * @return void
     */
    public function handle()
    {
        $this->stop();

        $this->info('Broadcasting watcher stop signal.');
    }

    /**
     * Dispatch the stop signal
     *
     * @param  int  $status
     * @return int
     */
    public function stop($status = 0)
    {
        $this->laravel['events']->dispatch(new WatcherStopping($status));

        return $status;
    }

And finally my WatcherStopping event:

<?php

namespace App\Events;

class WatcherStopping
{
    /**
     * The exit status.
     *
     * @var int
     */
    public int $status;

    /**
     * Create a new event instance.
     *
     * @param  int  $status
     * @return void
     */
    public function __construct(int $status)
    {
        $this->status = $status;
    }
}

I am clueless on why this doesn't work. I based my code on those lines from Laravel/framework:

https://github.com/laravel/framework/blob/277c2fbd0cebd2cb194807654d870f4040e288c0/src/Illuminate/Queue/Console/WorkCommand.php#L148

https://github.com/laravel/framework/blob/277c2fbd0cebd2cb194807654d870f4040e288c0/src/Illuminate/Foundation/Console/VendorPublishCommand.php#L174

Do you have any idea?