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<?php |
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declare(strict_types=1); |
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namespace WyriHaximus\React\Mutex; |
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use React\Cache\ArrayCache; |
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use React\Cache\CacheInterface; |
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use React\Promise\PromiseInterface; |
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use WyriHaximus\React\Mutex\Contracts\LockInterface; |
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use WyriHaximus\React\Mutex\Contracts\MutexInterface; |
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1 |
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use function bin2hex; |
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use function random_bytes; |
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use function React\Promise\resolve; |
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use function WyriHaximus\React\timedPromise; |
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final class Memory implements MutexInterface |
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{ |
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private const NO_MORE_ATTEMPTS_LEFT = 0; |
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private const RANDOM_BYTES_LENGTH = 13; |
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private CacheInterface $locks; |
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public function __construct() |
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{ |
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$this->locks = new ArrayCache(); |
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} |
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public function acquire(string $key, float $ttl): PromiseInterface |
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{ |
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/** |
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* @phpstan-ignore-next-line |
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* @psalm-suppress TooManyTemplateParams |
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*/ |
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return $this->locks->has($key)->then(function (bool $has) use ($key, $ttl): ?Lock { |
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if ($has) { |
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return null; |
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} |
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$rng = bin2hex(random_bytes(self::RANDOM_BYTES_LENGTH)); |
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$lock = new Lock($key, $rng); |
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$this->locks->set($key, $lock, $ttl); |
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return $lock; |
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}); |
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} |
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public function spin(string $key, float $ttl, int $attempts, float $interval): PromiseInterface |
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{ |
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/** |
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* @phpstan-ignore-next-line |
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*/ |
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return $this->acquire($key, $ttl)->then(function (?LockInterface $lock) use ($key, $ttl, $attempts, $interval): PromiseInterface { |
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if ($lock instanceof LockInterface || $attempts === self::NO_MORE_ATTEMPTS_LEFT) { |
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return resolve($lock); |
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} |
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return timedPromise($interval, [$key, $ttl, --$attempts, $interval])->then(function (array $args): PromiseInterface { |
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return $this->spin(...$args); |
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}); |
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}); |
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} |
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public function release(LockInterface $lock): PromiseInterface |
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{ |
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/** |
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* @psalm-suppress TooManyTemplateParams |
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*/ |
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return $this->locks->has($lock->key())->then(function (bool $has) use ($lock) { |
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return $has ? $this->locks->get($lock->key()) : $has; |
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})->then( |
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/** @phpstan-ignore-next-line */ |
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function (?Lock $storedLock) use ($lock) { |
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if ($storedLock instanceof Lock && $storedLock->rng() === $lock->rng()) { |
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return $this->locks->delete($lock->key()); |
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} |
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return ! ($storedLock instanceof Lock) || $storedLock->rng() === $lock->rng(); |
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} |
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); |
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} |
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} |
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WyriHaximus /
reactphp-mutex
