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<?php |
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declare(strict_types=1); |
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namespace RateLimit; |
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use RateLimit\Exception\LimitExceeded; |
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use Memcached; |
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final class MemcachedRateLimiter implements RateLimiter, SilentRateLimiter |
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{ |
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/** @var Memcached */ |
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private $memcached; |
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/** @var string */ |
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private $keyPrefix; |
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public function __construct(Memcached $memcached, string $keyPrefix = '') |
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{ |
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$this->memcached = $memcached; |
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$this->keyPrefix = $keyPrefix; |
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} |
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View Code Duplication |
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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View Code Duplication |
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) $this->memcached->get($key); |
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} |
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private function updateCounter(string $key, int $interval): int |
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{ |
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$this->memcached->increment($key, 1, 1); |
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$current = $this->getCurrent($key); |
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if ($current === 1) { |
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$this->memcached->touch($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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// memcached doesn't support retrieving TTL by key |
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// of course there are crutches, but we are normal developers |
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return 0; |
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} |
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} |
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nikolaposa /
rate-limit
Loading history...
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.