Async/bin/supervisor

#!/usr/bin/env php
<?php
/**
 * FuzeWorks Async Library
 *
 * The FuzeWorks PHP FrameWork
 *
 * Copyright (C) 2013-2020 TechFuze
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * @author    TechFuze
 * @copyright Copyright (c) 2013 - 2020, TechFuze. (http://techfuze.net)
 * @license   https://opensource.org/licenses/MIT MIT License
 *
 * @link  http://techfuze.net/fuzeworks
 * @since Version 1.0.0
 *
 * @version Version 1.0.0
 */

use FuzeWorks\Async\SuperVisor;
use FuzeWorks\Async\Tasks;
use FuzeWorks\Async\TasksException;
use FuzeWorks\Exception\InvalidArgumentException;
use FuzeWorks\Exception\LibraryException;
use FuzeWorks\Factory;

// First perform a PHP version check
if (version_compare('7.3.0', PHP_VERSION, '>')) {
    fwrite(
        STDERR,
        sprintf(
            'FuzeWorks Async requires PHP 7.3 or higher.' . PHP_EOL .
            'You are using PHP %s (%s).' . PHP_EOL,
            PHP_VERSION,
            PHP_BINARY
        )
    );

    die(1);
}

// First load composer
$autoloaders = [
    __DIR__ . '/../../autoload.php',
    __DIR__ . '/../vendor/autoload.php',
    __DIR__ . '/vendor/autoload.php'
];
foreach ($autoloaders as $file)
    if (file_exists($file))
        require_once($file);

// If a bootstrap is provided, use that one
$arguments = getopt('', ['bootstrap:']);
if (!isset($arguments['bootstrap']) || empty($arguments['bootstrap']))
{
    fwrite(STDERR, "Could not load supervisor. No bootstrap provided.");
    die(1);
}


// Load the file. If it doesn't exist, fail.
$bootstrap = $arguments['bootstrap'];
if (!file_exists($bootstrap))
{
    fwrite(STDERR, "Could not load supervisor. Provided bootstrap doesn't exist.");
    die(1);
}

// Load the bootstrap
/** @var Factory $container */
$container = require($bootstrap);

// Check if container is a Factory
if (!$container instanceof Factory)
{
    fwrite(STDERR, "Could not load supervisor. Provided bootstrap is not a valid bootstrap.");
    die(1);
}

// Check if the Async library is already loaded. If not, load it.
// @todo: Better check in libraries for existing library
try {
    /** @var Tasks $lib */
    $lib = $container->libraries->get('async');
} catch (LibraryException $e) {
    $container->libraries->addLibraryClass('async', '\FuzeWorks\Async\Tasks');
    /** @var Tasks $lib */
    $lib = $container->libraries->get('async');
}

// And finally, run the supervisor
try {
    $supervisor = $lib->getSuperVisor($bootstrap);
    $res = SuperVisor::RUNNING;
    while ($res === SuperVisor::RUNNING) {
        $res = $supervisor->cycle();
        usleep(250000);
    }

    // Write results
    if ($res === SuperVisor::CONSTRAINED)
        fwrite(STDOUT, "SuperVisor finished due to constrained tasks." . PHP_EOL);
    else
        fwrite(STDOUT, "SuperVisor finished due to finishing all tasks." . PHP_EOL);
} catch (InvalidArgumentException | TasksException | LibraryException $e) {
    fwrite(STDERR, sprintf('FuzeWorks Async could not load.' . PHP_EOL .
            'Exception: ' . $e->getMessage() . PHP_EOL)
    );
}