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<?php |
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namespace LeoCarmo\CircuitBreaker\Adapters; |
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use LeoCarmo\CircuitBreaker\CircuitBreaker; |
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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 $redisNamespace; |
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/** |
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* @var array |
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*/ |
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protected $cachedService = []; |
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/** |
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* Set settings for start circuit service |
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* |
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* @param \Redis $redis |
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* @param string $redisNamespace |
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*/ |
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public function __construct(\Redis $redis, string $redisNamespace) |
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{ |
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$this->redis = $redis; |
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$this->redisNamespace = $redisNamespace; |
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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 isOpen(string $service) : bool |
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{ |
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return $this->redis->get($this->makeNamespace($service) . ':open'); |
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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 reachRateLimit(string $service) : bool |
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{ |
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$failures = $this->redis->get( |
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$this->makeNamespace($service) . ':failures' |
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); |
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return $failures && $failures >= CircuitBreaker::getServiceSetting($service, '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) $this->redis->get($this->makeNamespace($service) . ':half_open'); |
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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 incrementFailure(string $service) : bool |
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{ |
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$serviceFailures = self::makeNamespace($service) . ':failures'; |
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if (! $this->redis->get($serviceFailures)) { |
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$this->redis->multi(); |
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$this->redis->incr($serviceFailures); |
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$this->redis->expire($serviceFailures, CircuitBreaker::getServiceSetting($service, 'timeWindow')); |
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return (bool) $this->redis->exec()[0] ?? false; |
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} |
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return (bool) $this->redis->incr($serviceFailures); |
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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 setSuccess(string $service) : bool |
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{ |
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return (bool) $this->redis->delete( |
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$this->redis->keys( |
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$this->makeNamespace($service) . ':*' |
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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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public function setOpenCircuit(string $service) : void |
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{ |
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$this->redis->set( |
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$this->makeNamespace($service) . ':open', |
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time(), |
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CircuitBreaker::getServiceSetting($service, 'timeWindow') |
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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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public function setHalfOpenCircuit(string $service) : void |
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{ |
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$this->redis->set( |
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$this->makeNamespace($service) . ':half_open', |
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time(), |
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CircuitBreaker::getServiceSetting($service, 'timeWindow') |
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+ CircuitBreaker::getServiceSetting($service, 'intervalToHalfOpen') |
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); |
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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 $service) |
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{ |
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if (isset($this->cachedService[$service])) { |
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return $this->cachedService[$service]; |
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} |
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return $this->cachedService[$service] = 'circuit-breaker:' . $this->redisNamespace . ':' . base64_encode($service); |
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} |
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} |
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leocarmo /
circuit-breaker-php
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