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require './vendor/autoload.php';

use GuzzleHttp\Client;
use GuzzleHttp\Exception\ConnectException;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Handler\CurlHandler;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Middleware;
use GuzzleHttp\Psr7\Request;
use GuzzleHttp\Psr7\Response;

class TestRetry {

    public function test()
    {
        $handlerStack = HandlerStack::create(new CurlHandler());
        $handlerStack->push(Middleware::retry($this->retryDecider(), $this->retryDelay()));
        $client = new Client(array('handler' => $handlerStack));

        $response = $client->request(
            'GET',
            // @todo replace to a real url!!!
            'https://500-error-code-url'
        )->getBody()->getContents();

        return \GuzzleHttp\json_decode($response, true);
    }


    public function retryDecider()
    {
        return function (
            $retries,
            Request $request,
            Response $response = null,
            RequestException $exception = null
        ) {
            // Limit the number of retries to 5
            if ($retries >= 5) {
                return false;
            }

            // Retry connection exceptions
            if ($exception instanceof ConnectException) {
                return true;
            }

            if ($response) {
                // Retry on server errors
                if ($response->getStatusCode() >= 500 ) {
                    return true;
                }
            }

            return false;
        };
    }

    /**
     * delay 1s 2s 3s 4s 5s
     *
     * @return Closure
     */
    public function retryDelay()
    {
        return function ($numberOfRetries) {
            return 1000 * $numberOfRetries;
        };
    }
}

$TestRetry = new TestRetry();
$TestRetry->test();