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<?php |
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namespace JVelasco\CircuitBreaker\Adapters; |
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use GuzzleHttp\Promise\Promise; |
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use GuzzleHttp\Promise\PromiseInterface; |
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use GuzzleHttp\Psr7\Response; |
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use JVelasco\CircuitBreaker\CircuitBreaker; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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class GuzzleMiddleware |
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{ |
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private $circuitBreaker; |
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private $handler; |
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public function __construct(CircuitBreaker $circuitBreaker, callable $handler) |
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{ |
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$this->circuitBreaker = $circuitBreaker; |
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$this->handler = $handler; |
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} |
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public function __invoke(RequestInterface $request, array $options): PromiseInterface |
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{ |
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$serviceName = implode("_", [ |
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$request->getUri()->getHost(), |
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$request->getUri()->getPort() |
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]); |
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/** @var Promise $promise */ |
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$promise = ($this->handler)($request, $options); |
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if (!$this->circuitBreaker->isAvailable($serviceName)) { |
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$promise->resolve($this->openCircuitResponse($serviceName)); |
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return $promise; |
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} |
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return $promise->then(function (ResponseInterface $response) use ($serviceName) { |
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$wasSuccessful = $response->getStatusCode() >= 200 && $response->getStatusCode() < 300; |
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if ($wasSuccessful) { |
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$this->circuitBreaker->reportSuccess($serviceName); |
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} else { |
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$this->circuitBreaker->reportFailure($serviceName); |
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} |
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return $response; |
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}); |
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} |
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private function openCircuitResponse(string $serviceName): Response |
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{ |
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$reasonPhrase = sprintf("Circuit for service %s is open", $serviceName); |
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return (new Response()) |
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->withStatus(503, $reasonPhrase); |
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} |
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} |
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j-velasco /
php-circuit-breaker
