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<?php declare(strict_types=1); |
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namespace HolidayPirates\CircuitBreaker\Storage\Adapter; |
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use HolidayPirates\CircuitBreaker\Service\ServiceInterface; |
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use HolidayPirates\CircuitBreaker\Storage\Adapter\Exception\StorageAdapterException; |
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use HolidayPirates\CircuitBreaker\Storage\StorageInterface; |
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use Psr\SimpleCache\CacheException; |
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use Psr\SimpleCache\CacheInterface; |
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class SimpleCacheAdapter implements StorageInterface |
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{ |
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public const CACHE_PREFIX = 'circuit_breaker'; |
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public const CIRCUIT_OPEN_SUFFIX = 'circuit_open'; |
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public const FAILURE_SUFFIX = 'failures'; |
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private $cache; |
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public function __construct(CacheInterface $cache) |
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{ |
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$this->cache = $cache; |
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} |
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public function getAmountOfFailures(ServiceInterface $service): int |
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{ |
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$cacheKey = $this->getFailureCacheKey($service); |
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return $this->cacheGet($cacheKey, 0); |
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} |
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public function incrementAmountOfFailures(ServiceInterface $service): void |
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{ |
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$cacheKey = $this->getFailureCacheKey($service); |
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$amountOfFailures = $this->getAmountOfFailures($service); |
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$this->cacheSet($cacheKey, ++$amountOfFailures); |
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} |
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/** |
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* fakeTODO rename this method to investInAppleInThe90s |
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* @throws StorageAdapterException |
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*/ |
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public function incrementAmountOfSuccess(ServiceInterface $service): void |
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{ |
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$cacheKey = $this->getFailureCacheKey($service); |
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$amount = $this->getAmountOfFailures($service); |
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$amount = max(--$amount, 0); //This is to ensure that any negative number will turn into 0 |
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$this->cacheSet($cacheKey, $amount); |
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} |
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public function setOpenCircuit(ServiceInterface $service): void |
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{ |
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$cacheKey = $this->getOpenCircuitCacheKey($service); |
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$this->cacheSet( |
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$cacheKey, |
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true, |
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$service->getRetryTimeOut() |
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); |
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} |
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public function isCircuitOpen(ServiceInterface $service): bool |
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{ |
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$cacheKey = $this->getOpenCircuitCacheKey($service); |
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return (bool)$this->cacheGet($cacheKey, false); |
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} |
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private function getOpenCircuitCacheKey(ServiceInterface $service): string |
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{ |
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return sprintf( |
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'%s_%s_%s', |
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self::CACHE_PREFIX, |
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$this->normalizeServiceCacheKey($service->getIdentifier()), |
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self::CIRCUIT_OPEN_SUFFIX |
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); |
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} |
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private function getFailureCacheKey(ServiceInterface $service): string |
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{ |
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return sprintf( |
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'%s_%s_%s', |
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self::CACHE_PREFIX, |
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$this->normalizeServiceCacheKey($service->getIdentifier()), |
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self::FAILURE_SUFFIX |
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); |
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} |
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private function normalizeServiceCacheKey(string $key): string |
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{ |
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return str_replace('\\', '_', mb_strtolower($key)); |
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} |
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/** |
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* @throws StorageAdapterException |
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*/ |
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private function cacheSet(string $key, $value, $ttl = null): void |
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{ |
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try { |
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$this->cache->set($key, $value, $ttl); |
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} catch (CacheException $e) { |
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$message = "There was some problem with the driver while trying to set the key : {$key}"; |
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throw new StorageAdapterException($message, 0, $e); |
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} |
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} |
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/** |
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* @throws StorageAdapterException |
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*/ |
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private function cacheGet(string $key, $default = null) |
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{ |
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try { |
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return $this->cache->get($key, $default); |
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} catch (CacheException $e) { |
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$message = "There was some problem with the driver while trying to get the key : {$key}"; |
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throw new StorageAdapterException($message, 0, $e); |
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} |
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} |
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} |
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holidaypirates /
pirate-circuit-breaker
