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<?php |
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namespace LeoCarmo\CircuitBreaker\Adapters; |
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use Redis; |
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use RedisCluster; |
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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|RedisCluster |
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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|RedisCluster $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->validateRedisInstance($redis); |
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$this->redis = $redis; |
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$this->redisNamespace = $redisNamespace; |
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} |
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protected function validateRedisInstance($redis) |
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{ |
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if (! $redis instanceof Redis && ! $redis instanceof RedisCluster) { |
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throw new \InvalidArgumentException('Redis is not a valid instance.'); |
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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) $this->redis->get($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 = (int) $this->redis->get( |
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$this->makeNamespace($service) . ':failures' |
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); |
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return ($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 $service) : bool |
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{ |
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$serviceName = $this->makeNamespace($service) . ':failures'; |
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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($serviceName, CircuitBreaker::getServiceSetting($service, 'timeWindow')); |
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return (bool) ($this->redis->exec()[0] ?? false); |
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} |
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return (bool) $this->redis->incr($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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*/ |
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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 $service): string |
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{ |
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if (isset($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
