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<?php
declare(strict_types=1);
namespace RateLimit;
use Memcached;
final class MemcachedRateLimiter extends AbstractElapsedTimeRateLimiter
{
private const MEMCACHED_SECONDS_LIMIT = 2592000; // Number of seconds in 30 days
/** @var Memcached */
private $memcached;
public function __construct(Memcached $memcached, string $keyPrefix = '')
if ($memcached->getOption(Memcached::OPT_BINARY_PROTOCOL) !== 1) {
throw new \RuntimeException('Memcached "OPT_BINARY_PROTOCOL" option should be set to "true".');
}
parent::__construct($keyPrefix);
$this->memcached = $memcached;
protected function getCurrent(string $valueKey): int
return (int) $this->memcached->get($valueKey);
protected function updateCounter(string $valueKey, string $timeKey, int $interval): int
$current = $this->memcached->increment($valueKey, 1, 1, $this->intervalToMemcachedTime($interval));
if ($current === 1) {
$this->memcached->add($timeKey, \time(), $this->intervalToMemcachedTime($interval));
return $current === false ? 1 : $current;
protected function getElapsedTime(string $timeKey): int
return \time() - (int) $this->memcached->get($timeKey);
/**
* Interval to Memcached expiration time.
*
* @see https://www.php.net/manual/en/memcached.expiration.php
* @param int $interval
* @return int
*/
private function intervalToMemcachedTime(int $interval): int
return $interval <= self::MEMCACHED_SECONDS_LIMIT ? $interval : \time() + $interval;
nikolaposa /
rate-limit
