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<?php declare(strict_types=1); |
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namespace LeoCarmo\CircuitBreaker\Adapters; |
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class RedisAdapter implements AdapterInterface |
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{ |
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/** |
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* @var \Redis |
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*/ |
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protected $redis; |
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/** |
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* @var string |
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*/ |
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protected string $redisNamespace; |
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/** |
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* Set settings for start circuit service |
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* |
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* @param $redis |
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* @param string $redisNamespace |
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*/ |
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public function __construct($redis, string $redisNamespace) |
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{ |
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$this->checkExtensionLoaded(); |
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$this->redis = $redis; |
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$this->redisNamespace = $redisNamespace; |
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} |
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protected function checkExtensionLoaded() |
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{ |
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if (! extension_loaded('redis')) { |
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throw new \RuntimeException('Extension redis is required to use RedisAdapter.'); |
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} |
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} |
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/** |
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* @param string $service |
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* @return bool |
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*/ |
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public function isOpen(string $service): bool |
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{ |
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return (bool) $this->redis->get( |
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$this->makeNamespace($service) . ':open' |
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); |
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} |
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/** |
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* @param string $service |
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* @param int $failureRateThreshold |
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* @return bool |
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*/ |
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public function reachRateLimit(string $service, int $failureRateThreshold): bool |
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{ |
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$failures = (int) $this->redis->get( |
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$this->makeNamespace($service) . ':failures' |
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); |
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return ($failures >= $failureRateThreshold); |
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} |
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/** |
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* @param string $service |
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* @return bool|string |
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*/ |
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public function isHalfOpen(string $service): bool |
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{ |
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return (bool) $this->redis->get( |
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$this->makeNamespace($service) . ':half_open' |
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); |
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} |
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/** |
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* @param string $service |
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* @param int $timeWindow |
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* @return bool |
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*/ |
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public function incrementFailure(string $service, int $timeWindow) : bool |
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{ |
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$serviceName = $this->makeNamespace($service) . ':failures'; |
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$this->resetKeyIfInfiniteTTL($serviceName); |
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if (! $this->redis->get($serviceName)) { |
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$this->redis->multi(); |
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$this->redis->incr($serviceName); |
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$this->redis->expire($serviceName, $timeWindow); |
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return (bool) ($this->redis->exec()[0] ?? false); |
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} |
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return (bool) $this->redis->incr($serviceName); |
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} |
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/** |
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* @param string $service |
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*/ |
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public function setSuccess(string $service): void |
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{ |
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$serviceName = $this->makeNamespace($service); |
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$this->redis->multi(); |
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$this->redis->del($serviceName . ':open'); |
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$this->redis->del($serviceName . ':failures'); |
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$this->redis->del($serviceName . ':half_open'); |
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$this->redis->exec(); |
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} |
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/** |
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* @param string $service |
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* @param int $timeWindow |
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*/ |
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public function setOpenCircuit(string $service, int $timeWindow): void |
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{ |
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$this->redis->set( |
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$this->makeNamespace($service) . ':open', |
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time(), |
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$timeWindow |
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); |
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} |
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/** |
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* @param string $service |
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* @param int $timeWindow |
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* @param int $intervalToHalfOpen |
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*/ |
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public function setHalfOpenCircuit(string $service, int $timeWindow, int $intervalToHalfOpen): void |
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{ |
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$this->redis->set( |
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$this->makeNamespace($service) . ':half_open', |
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time(), |
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($timeWindow + $intervalToHalfOpen) |
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); |
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} |
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public function getFailuresCounter(string $service): int |
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{ |
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$failures = $this->redis->get( |
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$this->makeNamespace($service) . ':failures' |
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); |
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return (int) $failures; |
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} |
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/** |
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* @param string $service |
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* @return string |
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*/ |
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protected function makeNamespace(string $service): string |
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{ |
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return 'circuit-breaker:' . $this->redisNamespace . ':' . $service; |
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} |
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protected function resetKeyIfInfiniteTTL(string $service) |
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{ |
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if ($this->redis->ttl($service) === -1) { |
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$this->redis->del($service); |
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} |
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} |
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} |
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leocarmo /
circuit-breaker-php
