monitor_layout/app/Commands/Monitor.php

<?php

declare(strict_types=1);

namespace App\Commands;

use Illuminate\Console\Command;

/**
 * Continually relayout based on the passed in config
 *
 * @author Adam Pippin <hello@adampippin.ca>
 */
class Monitor extends Command
{
	/**
	 * The name and signature of the console command.
	 *
	 * @var string
	 */
	protected $signature = 'monitor {config} {--interval=5 : how often to attempt relayout in seconds}';

	/**
	 * The console command description.
	 *
	 * @var string
	 */
	protected $description = 'Relayout on a schedule';

	/**
	 * Create a new command instance.
	 *
	 * @return void
	 */
	public function __construct()
	{
		parent::__construct();
	}

	/**
	 * Execute the console command.
	 *
	 * @param  \App\ILayoutDriver $driver
	 * @return void
	 */
	public function handle(\App\ILayoutDriver $driver)
	{
		$config_file = $this->argument('config');

		if (!file_exists($config_file) || !is_readable($config_file))
		{
			throw new \Exception("Cannot read config file: $config_file");
		}

		$config = new \App\Configuration();
		$config->load($config_file);

		$engine = app()->make(\App\Engine::class, ['config' => $config]);

		declare(ticks=1);

		$signal_handler = static function(int $signal) use ($config_file, &$engine) {
			switch ($signal)
			{
				case SIGHUP:
					$config = new \App\Configuration();
					$config->load($config_file);
					$engine = app()->make(\App\Engine::class, ['config' => $config]);
					break;
			}
		};

		pcntl_signal(SIGHUP, $signal_handler);

		while (true)
		{
			$engine->layout();
			sleep((int)$this->option('interval'));
		}
	}
}