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<?php |
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declare(strict_types=1); |
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namespace RateLimit; |
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use Predis\ClientInterface; |
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use RateLimit\Exception\LimitExceeded; |
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View Code Duplication |
final class PredisRateLimiter implements RateLimiter, SilentRateLimiter |
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{ |
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/** @var ClientInterface */ |
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private $predis; |
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/** @var string */ |
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private $keyPrefix; |
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public function __construct(ClientInterface $predis, string $keyPrefix = '') |
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{ |
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$this->predis = $predis; |
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$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->getOperations(), |
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time() + $this->ttl($key) |
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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}{$identifier}:$interval"; |
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} |
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private function getCurrent(string $key): int |
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{ |
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return (int) $this->predis->get($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 = $this->predis->incr($key); |
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if ($current === 1) { |
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$this->predis->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->predis->pttl($key) / 1000), 0); |
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} |
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} |
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nikolaposa /
rate-limit
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.