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<?php |
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namespace Ackintosh\Ganesha\Storage\Adapter; |
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use Ackintosh\Ganesha; |
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use Ackintosh\Ganesha\Configuration; |
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use Ackintosh\Ganesha\Exception\StorageException; |
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use Ackintosh\Ganesha\Storage\AdapterInterface; |
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class Redis implements AdapterInterface, SlidingTimeWindowInterface |
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{ |
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/** |
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* @var \Ackintosh\Ganesha\Storage\Adapter\RedisStore |
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*/ |
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private $redis; |
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/** |
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* @var Configuration |
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*/ |
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private $configuration; |
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/** |
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* @param \Redis|\RedisArray|\RedisCluster|\Predis\Client|\Ackintosh\Ganesha\Storage\Adapter\RedisStore $redis |
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*/ |
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public function __construct($redis) |
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{ |
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if (!($redis instanceof RedisStore)) { |
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$redis = new RedisStore($redis); |
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} |
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$this->redis = $redis; |
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} |
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/** |
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* @return bool |
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*/ |
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public function supportCountStrategy(): bool |
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{ |
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return false; |
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} |
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/** |
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* @return bool |
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*/ |
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public function supportRateStrategy(): bool |
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{ |
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return true; |
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} |
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/** |
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* @param Configuration $configuration |
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* |
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* @return void |
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*/ |
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public function setConfiguration(Configuration $configuration): void |
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{ |
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$this->configuration = $configuration; |
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} |
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/** |
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* @param string $service |
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* |
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* @return int |
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* @throws StorageException |
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*/ |
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public function load(string $service): int |
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{ |
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$expires = microtime(true) - $this->configuration['timeWindow']; |
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if ($this->redis->zRemRangeByScore($service, '-inf', $expires) === false) { |
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throw new StorageException('Failed to remove expired elements. service: ' . $service); |
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} |
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$r = $this->redis->zCard($service); |
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if ($r === false) { |
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throw new StorageException('Failed to load cardinality. service: ' . $service); |
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} |
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return $r; |
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} |
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/** |
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* @param string $service |
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* @param int $count |
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* @return void |
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*/ |
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public function save(string $service, int $count): void |
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{ |
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// Redis adapter does not support Count strategy |
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} |
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/** |
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* @param string $service |
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* |
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* @throws StorageException |
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*/ |
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public function increment(string $service): void |
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{ |
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$t = microtime(true); |
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$this->redis->zAdd($service, $t, $t); |
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} |
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public function decrement(string $service): void |
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{ |
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// Redis adapter does not support Count strategy |
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} |
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public function saveLastFailureTime(string $service, int $lastFailureTime): void |
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{ |
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// nop |
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} |
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/** |
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* @param $service |
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* |
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* @return int|null |
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* @throws StorageException |
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*/ |
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public function loadLastFailureTime(string $service) |
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{ |
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$lastFailure = $this->redis->zRange($service, -1, -1); |
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if (!$lastFailure) { |
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return null; |
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} |
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return (int)$lastFailure[0]; |
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} |
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/** |
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* @param string $service |
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* @param int $status |
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* |
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* @throws StorageException |
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*/ |
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public function saveStatus(string $service, int $status): void |
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{ |
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$r = $this->redis->set($service, $status); |
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if ($r === false) { |
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throw new StorageException(sprintf( |
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'Failed to save status. service: %s, status: %d', |
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$service, |
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$status |
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)); |
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} |
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} |
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/** |
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* @param string $service |
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* |
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* @return int |
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* @throws StorageException |
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*/ |
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public function loadStatus(string $service): int |
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{ |
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$r = $this->redis->get($service); |
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// \Redis::get() returns FALSE if key didn't exist. |
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// @see https://github.com/phpredis/phpredis#get |
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if ($r === false) { |
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$this->saveStatus($service, Ganesha::STATUS_CALMED_DOWN); |
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return Ganesha::STATUS_CALMED_DOWN; |
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} |
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return (int)$r; |
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} |
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public function reset(): void |
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{ |
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// TODO: Implement reset() method. |
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} |
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} |
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ackintosh /
ganesha
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