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<?php |
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declare(strict_types=1); |
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namespace Cerbero\LazyJsonPages\Concerns; |
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use Generator; |
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use GuzzleHttp\Pool; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Throwable; |
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/** |
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* The trait to send asynchronous HTTP requests. |
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* |
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* @property-read \Cerbero\LazyJsonPages\Sources\AnySource $source |
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* @property-read \Cerbero\LazyJsonPages\Services\Book $book |
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*/ |
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trait SendsAsyncRequests |
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{ |
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use RespectsRateLimits; |
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use RetriesHttpRequests; |
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/** |
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* Fetch pages by sending asynchronous HTTP requests. |
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* |
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* @return Generator<int, ResponseInterface> |
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*/ |
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protected function fetchPagesAsynchronously(int $totalPages): Generator |
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{ |
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$request = clone $this->source->request(); |
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$fromPage = $this->config->firstPage + 1; |
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$toPage = $this->config->firstPage == 0 ? $totalPages - 1 : $totalPages; |
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yield from $this->retry(function () use ($request, &$fromPage, $toPage) { |
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foreach ($this->chunkRequestsBetweenPages($request, $fromPage, $toPage) as $requests) { |
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yield from $this->pool($requests); |
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} |
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}); |
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} |
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/** |
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* Retrieve requests for the given pages in chunks. |
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* |
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* @return Generator<int, Generator<int, RequestInterface>> |
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*/ |
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protected function chunkRequestsBetweenPages(RequestInterface $request, int &$fromPage, int $toPage): Generator |
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{ |
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while ($fromPage <= $toPage) { |
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yield $this->yieldRequestsBetweenPages($request, $fromPage, $toPage); |
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$this->respectRateLimits(); |
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} |
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} |
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/** |
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* Yield the requests between the given pages. |
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* |
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* @return Generator<int, RequestInterface> |
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*/ |
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protected function yieldRequestsBetweenPages(RequestInterface $request, int &$fromPage, int $toPage): Generator |
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{ |
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$chunkSize = min($this->config->async, $this->config->rateLimits?->threshold() ?? INF); |
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for ($i = 0; $i < $chunkSize && $fromPage <= $toPage; $i++) { |
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$page = $this->book->pullFailedPage() ?? $fromPage++; |
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yield $page => $request->withUri($this->uriForPage($request->getUri(), (string) $page)); |
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} |
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} |
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/** |
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* Send a pool of asynchronous requests. |
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* |
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* @param Generator<int, RequestInterface> $requests |
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* @return Generator<int, ResponseInterface> |
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* @throws Throwable |
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*/ |
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protected function pool(Generator $requests): Generator |
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{ |
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$exception = null; |
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$config = [ |
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'concurrency' => $this->config->async, |
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'fulfilled' => fn(ResponseInterface $response, int $page) => $this->book->addPage($page, $response), |
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'rejected' => function (Throwable $e, int $page) use (&$exception) { |
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$this->book->addFailedPage($page); |
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$exception = $e; |
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}, |
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]; |
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(new Pool($this->client, $requests, $config))->promise()->wait(); |
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if (isset($exception)) { |
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throw $exception; |
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} |
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yield from $this->book->pullPages(); |
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} |
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} |
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cerbero90 /
lazy-json-pages
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