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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\CannotUseRateLimiter; |
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use RateLimit\Exception\LimitExceeded; |
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final class ApcuRateLimiter implements RateLimiter, SilentRateLimiter |
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{ |
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/** @var string */ |
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private $keyPrefix; |
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public function __construct(string $keyPrefix = '') |
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{ |
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if (!\extension_loaded('apcu') || \ini_get('apc.enabled') === '0') { |
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throw new CannotUseRateLimiter('APCu extension is not loaded or not enabled.'); |
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} |
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if (\ini_get('apc.use_request_time') === '1') { |
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throw new CannotUseRateLimiter('APCu ini configuration "apc.use_request_time" should be set to "0".'); |
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} |
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$this->keyPrefix = $keyPrefix; |
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} |
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public function limit(string $identifier, Rate $rate): void |
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{ |
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$interval = $rate->getInterval(); |
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$valueKey = $this->valueKey($identifier, $interval); |
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$timeKey = $this->timeKey($identifier, $interval); |
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$current = $this->getCurrent($valueKey); |
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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($valueKey, $timeKey, $rate->getInterval()); |
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} |
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public function limitSilently(string $identifier, Rate $rate): Status |
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{ |
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$interval = $rate->getInterval(); |
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$valueKey = $this->valueKey($identifier, $interval); |
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$timeKey = $this->timeKey($identifier, $interval); |
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$current = $this->getCurrent($valueKey); |
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if ($current <= $rate->getOperations()) { |
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$current = $this->updateCounter($valueKey, $timeKey, $interval); |
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} |
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return Status::from( |
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\sprintf('%s%s', $this->keyPrefix, $identifier), |
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$current, |
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$rate->getOperations(), |
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\time() + \max(0, $interval - $this->getElapsedTime($timeKey)) |
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); |
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} |
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private function valueKey(string $identifier, int $interval): string |
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{ |
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return "{$this->keyPrefix}{$identifier}:value:$interval"; |
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} |
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private function timeKey(string $identifier, int $interval): string |
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{ |
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return "{$this->keyPrefix}{$identifier}:time:$interval"; |
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} |
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private function getCurrent(string $valueKey): int |
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{ |
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return (int) \apcu_fetch($valueKey); |
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} |
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private function updateCounter(string $valueKey, string $timeKey, int $interval): int |
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{ |
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$current = \apcu_inc($valueKey, 1, $success, $interval); |
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if ($current === 1) { |
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\apcu_store($timeKey, \time(), $interval); |
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} |
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return $current === false ? 1 : $current; |
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} |
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protected function getElapsedTime(string $timeKey): int |
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{ |
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return \time() - (int) \apcu_fetch($timeKey); |
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} |
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} |
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nikolaposa /
rate-limit
