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<?php declare(strict_types=1); |
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namespace ApiClients\Client\Github\Service; |
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use ApiClients\Foundation\Transport\Service\RequestService; |
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use Psr\Http\Message\ResponseInterface; |
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use React\Promise\CancellablePromiseInterface; |
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use RingCentral\Psr7\Request; |
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use Rx\Disposable\CallbackDisposable; |
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use Rx\Observable; |
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use Rx\ObserverInterface; |
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use Rx\SchedulerInterface; |
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use Rx\Subject\Subject; |
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use function React\Promise\all; |
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use function React\Promise\resolve; |
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class IteratePagesService |
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{ |
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/** |
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* @var RequestService |
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*/ |
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private $requestService; |
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/** |
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* @param RequestService $requestService |
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*/ |
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public function __construct(RequestService $requestService) |
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{ |
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$this->requestService = $requestService; |
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} |
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public function iterate(string $path): Observable |
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{ |
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return Observable::create(function ( |
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ObserverInterface $observer |
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) use ($path) { |
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$subject = new Subject(); |
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$subject->asObservable()->subscribe( |
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[$observer, 'onNext'], |
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[$observer, 'onError'], |
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[$observer, 'onCompleted'] |
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); |
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$this->sendRequest($path, $subject); |
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return new CallbackDisposable(function () use ($subject) { |
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$subject->dispose(); |
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}); |
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}); |
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} |
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private function sendRequest(string $path, Subject $subject) |
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{ |
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$this->requestService-> |
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handle(new Request('GET', $path))-> |
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then( |
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function ($response) use ($subject) { |
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$this->handleResponse($response, $subject); |
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}, |
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function ($error) use ($subject) { |
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$subject->onError($error); |
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} |
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) |
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; |
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} |
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private function handleResponse( |
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ResponseInterface $response, |
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Subject $subject |
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) { |
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$subject->onNext($response->getBody()->getJson()); |
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if ($subject->isDisposed() || !$subject->hasObservers()) { |
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$subject->onCompleted(); |
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return; |
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} |
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if (!$response->hasHeader('link')) { |
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$subject->onCompleted(); |
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return; |
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} |
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$links = [ |
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'next' => false, |
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'last' => false, |
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]; |
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foreach (explode(', ', $response->getHeader('link')[0]) as $link) { |
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list($url, $rel) = explode('>; rel="', ltrim(rtrim($link, '"'), '<')); |
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if (isset($links[$rel])) { |
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$links[$rel] = $url; |
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} |
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} |
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if ($links['next'] === false || $links['last'] === false) { |
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$subject->onCompleted(); |
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return; |
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} |
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$this->sendRequest($links['next'], $subject); |
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} |
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} |
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: