PHP Exporter to native Redis protocol.

NativeProtocolExporter.php

<?php

namespace App\Infra\Redis;

use Webmozart\Assert\Assert;

class NativeProtocolExporter
{
    const NEWLINE = "\r\n";

    /**
     * @see https://redis.io/topics/mass-insert
     *
     * @return string
     */
    public function __invoke(): string
    {
        /* @see https://github.com/redis/hiredis/issues/225#issuecomment-40100171 */
        Assert::maxLength(func_num_args(), 1024 * 1024 + 1, '1048576 is maximum number of keys in buld insert');
        $buf = '';
        $buf .= '*'.func_num_args().self::NEWLINE;
        foreach (func_get_args() as $arg) {
            Assert::string($arg);
            $buf .= '$'.strlen($arg).self::NEWLINE;
            $buf .= $arg.self::NEWLINE;
        }

        return $buf;
    }
}