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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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abstract class AbstractElapsedTimeRateLimiter implements RateLimiter, SilentRateLimiter |
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{ |
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/** |
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* @var string |
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*/ |
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private $keyPrefix; |
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public function __construct(string $keyPrefix = '') |
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{ |
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$this->keyPrefix = $keyPrefix; |
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} |
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final 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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final 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 \sprintf('%s%s:value:%d', $this->keyPrefix, $identifier, $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 \sprintf('%s%s:time:%d', $this->keyPrefix, $identifier, $interval); |
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} |
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abstract protected function getCurrent(string $valueKey): int; |
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abstract protected function updateCounter(string $valueKey, string $timeKey, int $interval): int; |
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abstract protected function getElapsedTime(string $timeKey): int; |
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} |
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nikolaposa /
rate-limit
