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<?php |
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namespace Cerbero\LazyJsonPages\Concerns; |
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use Cerbero\LazyJsonPages\Outcome; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Pool; |
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use GuzzleHttp\Psr7\Uri; |
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use Illuminate\Support\LazyCollection; |
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use Psr\Http\Message\ResponseInterface; |
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use Throwable; |
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use Traversable; |
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/** |
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* The trait to handle APIs with the number of total pages. |
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* |
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*/ |
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trait HandlesTotalPages |
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{ |
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/** |
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* Handle APIs with the given number of total pages |
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* |
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* @param int $pages |
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* @param Uri|null $uri |
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* @return Traversable |
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*/ |
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protected function handleByTotalPages(int $pages, Uri $uri = null): Traversable |
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{ |
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$uri = $uri ?: $this->config->source->request->getUri(); |
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$firstPageAlreadyFetched = strval($uri) == strval($this->config->source->request->getUri()); |
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$chunkedPages = $this->chunkPages($pages, $firstPageAlreadyFetched); |
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$items = $this->fetchItemsAsynchronously($chunkedPages, $uri); |
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if ($firstPageAlreadyFetched) { |
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yield from $this->config->source->json($this->config->path); |
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} |
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yield from $items; |
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} |
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/** |
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* Retrieve the given pages in chunks |
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* |
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* @param int $pages |
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* @param bool $skipFirstPage |
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* @return iterable |
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*/ |
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protected function chunkPages(int $pages, bool $skipFirstPage): iterable |
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{ |
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$firstPage = $skipFirstPage ? $this->config->firstPage + 1 : $this->config->firstPage; |
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$lastPage = $this->config->firstPage == 0 ? $pages - 1 : $pages; |
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return LazyCollection::range($firstPage, $lastPage)->chunk($this->config->chunk ?: INF); |
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} |
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/** |
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* Fetch items by performing asynchronous HTTP calls |
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* |
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* @param iterable $chunkedPages |
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* @param Uri $uri |
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* @return Traversable |
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*/ |
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protected function fetchItemsAsynchronously(iterable $chunkedPages, Uri $uri): Traversable |
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{ |
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$client = new Client(['timeout' => $this->config->timeout]); |
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foreach ($chunkedPages as $pages) { |
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$outcome = $this->retry(function (Outcome $outcome) use ($uri, $client, $pages) { |
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$pages = $outcome->pullFailedPages() ?: $pages; |
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return $this->pool($client, $outcome, function () use ($uri, $pages) { |
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$request = clone $this->config->source->request; |
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foreach ($pages as $page) { |
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yield $page => $request->withUri(Uri::withQueryValue($uri, $this->config->pageName, $page)); |
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} |
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}); |
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}); |
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yield from $outcome->pullItems(); |
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} |
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} |
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/** |
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* Retrieve the outcome of a pool of asynchronous requests |
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* |
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* @param Client $client |
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* @param Outcome $outcome |
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* @param callable $getRequests |
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* @return Outcome |
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*/ |
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protected function pool(Client $client, Outcome $outcome, callable $getRequests): Outcome |
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{ |
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$pool = new Pool($client, $getRequests(), [ |
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'concurrency' => $this->config->concurrency, |
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'fulfilled' => function (ResponseInterface $response, int $page) use ($outcome) { |
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$outcome->addItemsFromPage($page, $response, $this->config->path); |
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}, |
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'rejected' => function (Throwable $e, int $page) use ($outcome) { |
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$outcome->addFailedPage($page); |
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throw $e; |
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} |
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]); |
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$pool->promise()->wait(); |
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return $outcome; |
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} |
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} |
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cerbero90 /
lazy-json-pages
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