parallel/bin/worker

#!/usr/bin/env php
<?php

use Amp\Parallel\Sync;
use Amp\Parallel\Worker;

const AMP_WORKER = "amp-worker";

// Doesn't exist in phpdbg...
if (function_exists("cli_set_process_title")) {
    @cli_set_process_title(AMP_WORKER);
}

// Redirect all output written using echo, print, printf, etc. to STDERR.
ob_start(function ($data) {
    fwrite(STDERR, $data);
    return '';
}, 1, PHP_OUTPUT_HANDLER_CLEANABLE | PHP_OUTPUT_HANDLER_FLUSHABLE);

(function () {
    $paths = [
        dirname(__DIR__, 3) . "/autoload.php",
        dirname(__DIR__) . "/vendor/autoload.php",
    ];

    foreach ($paths as $path) {
        if (file_exists($path)) {
            $autoloadPath = $path;
            break;
        }
    }

    if (!isset($autoloadPath)) {
        fwrite(STDERR, "Could not locate autoload.php");
        exit(1);
    }

    require $autoloadPath;
})();

Amp\Loop::run(function () {
    $channel = new Sync\ChannelledSocket(STDIN, STDOUT);
    $environment = new Worker\BasicEnvironment;
    $runner = new Worker\Internal\TaskRunner($channel, $environment);

    try {
        $result = new Sync\Internal\ExitSuccess(yield $runner->run());
    } catch (Sync\ChannelException $exception) {
        exit(1); // Parent context died, simply exit.
    } catch (Throwable $exception) {
        $result = new Sync\Internal\ExitFailure($exception);
    }

    try {
        yield $channel->send($result);
    } catch (Throwable $exception) {
        exit(1); // Parent context died, simply exit.
    }
});