php-monolog/src/Monolog/Handler/ProcessableHandlerTrait.php

<?php declare(strict_types=1);

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Monolog\Handler;

/**
 * Helper trait for implementing ProcessableInterface
 *
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
trait ProcessableHandlerTrait
{
    /**
     * @var callable[]
     */
    protected $processors = [];

    /**
     * {@inheritdoc}
     */
    public function pushProcessor(callable $callback): HandlerInterface
    {
        if (!is_callable($callback)) {
            throw new \InvalidArgumentException('Processors must be valid callables (callback or object with an __invoke method), '.var_export($callback, true).' given');
        }
        array_unshift($this->processors, $callback);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function popProcessor(): callable
    {
        if (!$this->processors) {
            throw new \LogicException('You tried to pop from an empty processor stack.');
        }

        return array_shift($this->processors);
    }

    /**
     * Processes a record.
     *
     * @param  array $record
     * @return array
     */
    protected function processRecord(array $record)
    {
        foreach ($this->processors as $processor) {
            $record = $processor($record);
        }

        return $record;
    }
}