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<?php |
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namespace BeyondCode\FixedWindowLimiter; |
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use Carbon\CarbonInterval; |
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use Illuminate\Support\Facades\Redis; |
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use Illuminate\Redis\Connections\Connection; |
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class FixedWindowLimiter |
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{ |
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/** @var int */ |
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private $timeWindow; |
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/** @var int */ |
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private $limit; |
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public function __construct(CarbonInterval $timeWindow, int $limit) |
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{ |
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$this->timeWindow = $timeWindow->totalSeconds; |
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$this->limit = $limit; |
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} |
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public static function create(CarbonInterval $timeWindow, int $limit): self |
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{ |
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return new static($timeWindow, $limit); |
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} |
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public function attempt(string $resource): bool |
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{ |
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$key = $this->buildKey($resource); |
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$hits = $this->getConnection()->hincrby($key, 'attempts', 1); |
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if ($hits === 1) { |
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$this->getConnection()->expire($key, $this->timeWindow); |
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} |
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return $hits <= $this->limit; |
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} |
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public function getUsage(string $resource): int |
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{ |
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$usage = (int)$this->getConnection()->hget($this->buildKey($resource), 'attempts'); |
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return min($this->limit, $usage); |
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} |
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public function getRemaining(string $resource): int |
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{ |
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$remaining = $this->limit - $this->getUsage($resource); |
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return max(0, $remaining); |
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} |
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private function getConnection(): Connection |
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{ |
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return Redis::connection(config('limiter.connection')); |
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} |
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private function buildKey(string $resource): string |
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{ |
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return config('limiter.prefix') . $resource; |
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} |
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public function getRealUsage(string $resource): int |
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{ |
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return (int)$this->getConnection()->hget($this->buildKey($resource), 'attempts'); |
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} |
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public function reset(string $resource, array $additionalData = []) |
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{ |
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$key = $this->buildKey($resource); |
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$this->getConnection()->hset($key, 'attempts', 0); |
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foreach ($additionalData as $field => $value) { |
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$this->getConnection()->hset($key, $field, $value); |
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} |
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$this->getConnection()->expire($key, $this->timeWindow); |
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} |
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public function getAdditionalData(string $resource, string $key) |
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{ |
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return $this->getConnection()->hget($this->buildKey($resource), $key); |
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} |
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} |
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beyondcode /
laravel-fixed-window-limiter
This check looks for assignments to scalar types that may be of the wrong type.
To ensure the code behaves as expected, it may be a good idea to add an explicit type cast.