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<?php declare(strict_types = 1); |
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namespace CircuitBreakerBundle\Service; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\LoggerTrait as PsrLoggerTrait; |
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use Symfony\Component\Cache\Adapter\AdapterInterface; |
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class CircuitBreakerService |
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{ |
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use PsrLoggerTrait; |
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const OPEN = 'open'; |
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const CLOSED = 'closed'; |
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const HALFOPEN = 'half-open'; |
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const STATUS_UP = true; |
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const STATUS_DOWN = false; |
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/** |
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* @var AdapterInterface |
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*/ |
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private $cacheApp; |
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/** |
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* @var array |
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*/ |
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private $status; |
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/** |
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* @var int |
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*/ |
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private $threshold; |
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/** |
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* @var int |
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*/ |
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private $timeout; |
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/** |
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* @param AdapterInterface $cacheApp |
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* @param int $threshold |
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* @param int $timeout |
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*/ |
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public function __construct(AdapterInterface $cacheApp, int $threshold, int $timeout) |
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{ |
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$this->cacheApp = $cacheApp; |
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$this->threshold = $threshold; |
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$this->timeout = $timeout; |
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} |
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/** |
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* @param string $key The service key |
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* @param bool $status The service status (true: up, false: down) |
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*/ |
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public function save(string $key, bool $status) |
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{ |
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if (!isset($this->status[$key])) { |
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$this->status[$key] = self::CLOSED; |
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} |
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if ($this->status[$key] === self::OPEN) { |
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$this->attemptReset($key); |
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} |
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if (!$status) { |
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$this->countFailure($key); |
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} else { |
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$this->resetCount($key); |
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} |
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} |
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/** |
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* Verify if service is open. |
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* |
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* @param string $service |
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* |
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* @return bool |
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*/ |
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public function isOpen(string $service): bool |
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{ |
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if (!isset($this->status[$service]) && |
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$this->cacheApp->getItem($service)->get() >= $this->threshold |
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) { |
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$this->status[$service] = self::OPEN; |
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} |
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return isset($this->status[$service]) && $this->status[$service] === self::OPEN; |
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} |
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/** |
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* Increment number of fail to one service |
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* |
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* @param string $service |
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*/ |
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private function countFailure(string $service) |
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{ |
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$this->notice('[CircuitBreaker] call countFailure to ' . $service); |
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$value = $this->cacheApp->getItem($service); |
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$fail = $value->get() + 1; |
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$value->set($fail); |
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if ($this->status[$service] === self::HALFOPEN) { |
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$value->set($this->threshold); |
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} |
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$value->expiresAfter($this->timeout); |
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if ($fail >= $this->threshold) { |
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$this->tripBreaker($service); |
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} |
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$this->cacheApp->save($value); |
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} |
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/** |
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* Open circuit breaker. |
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* |
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* @param string $service |
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*/ |
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private function tripBreaker(string $service) |
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{ |
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$this->error('[CircuitBreaker] call tripBreaker to ' . $service); |
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$this->status[$service] = self::OPEN; |
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} |
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/** |
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* CLose circuit breaker, and reset value to fail service. |
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* |
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* @param string $service |
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*/ |
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private function resetCount(string $service) |
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{ |
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$this->info('[CircuitBreaker] call resetCount to ' . $service); |
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$value = $this->cacheApp->getItem($service); |
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$value->set(0); |
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$this->status[$service] = self::CLOSED; |
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$this->cacheApp->save($value); |
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} |
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/** |
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* HalfOpen circuit breaker. |
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* |
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* @param string $service |
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*/ |
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private function attemptReset(string $service) |
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{ |
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$this->warning('[CircuitBreaker] call attemptReset to ' . $service); |
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$this->status[$service] = self::HALFOPEN; |
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} |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* @param LoggerInterface $logger |
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*/ |
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161
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10 |
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public function setLogger(LoggerInterface $logger) |
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{ |
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$this->logger = $logger; |
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} |
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/** |
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* @param string $level |
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* @param string $message |
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* @param array $context |
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*/ |
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9 |
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public function log($level, $message, array $context = array()) |
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{ |
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9 |
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$this->logger->log($level, $message, $context); |
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} |
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} |
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lemonde /
php-circuit-breaker-bundle
