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<?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;

use Monolog\Formatter\LineFormatter;
use Monolog\Formatter\FormatterInterface;
use Monolog\Logger;

/**
 * Sends the message to a Redis Pub/Sub channel using PUBLISH
 *
 * usage example:
 *
 *   $log = new Logger('application');
 *   $redis = new RedisPubSubHandler(new Predis\Client("tcp://localhost:6379"), "logs", Logger::WARNING);
 *   $log->pushHandler($redis);
 *
 * @author Gaëtan Faugère <gaetan@fauge.re>
 */
class RedisPubSubHandler extends AbstractProcessingHandler
{
    /** @var \Predis\Client|\Redis */
    private $redisClient;
    /** @var string */
    private $channelKey;

    /**
     * @param \Predis\Client|\Redis $redis The redis instance
     * @param string                $key   The channel key to publish records to
     */
    public function __construct($redis, string $key, $level = Logger::DEBUG, bool $bubble = true)
    {
        if (!(($redis instanceof \Predis\Client) || ($redis instanceof \Redis))) {
            throw new \InvalidArgumentException('Predis\Client or Redis instance required');
        }

        $this->redisClient = $redis;
        $this->channelKey = $key;

        parent::__construct($level, $bubble);
    }

    /**
     * {@inheritDoc}
     */
    protected function write(array $record): void
    {
        $this->redisClient->publish($this->channelKey, $record["formatted"]);
    }

    /**
     * {@inheritDoc}
     */
    protected function getDefaultFormatter(): FormatterInterface
    {
        return new LineFormatter();
    }
}