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