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<?php
declare(strict_types=1);
namespace RateLimit;
use DateTimeImmutable;
use Redis;
final class RedisRateLimiter implements RateLimiter
{
/** @var Redis */
private $redis;
/** @var string */
private $keyPrefix;
public function __construct(Redis $redis, string $keyPrefix = '')
$this->redis = $redis;
$this->keyPrefix = $keyPrefix;
}
public function handle(string $identifier, QuotaPolicy $quotaPolicy): Status
$key = $this->key($identifier, $quotaPolicy->getInterval());
$current = (int) $this->redis->get($key);
if ($current <= $quotaPolicy->getQuota()) {
$current = $this->redis->incr($key);
if ($current === 1) {
$this->redis->expire($key, $quotaPolicy->getInterval());
return Status::from(
$identifier,
$current,
$quotaPolicy,
(new DateTimeImmutable())->modify('+' . $this->ttl($key) . ' seconds')
);
private function key(string $identifier, int $interval): string
return "{$this->keyPrefix}:{$interval}:$identifier";
private function ttl(string $key): int
return max((int) ceil($this->redis->pttl($key) / 1000), 0);
nikolaposa /
rate-limit
