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<?php |
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namespace PubPeerFoundation\PublicationDataExtractor; |
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use Generator; |
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use Tightenco\Collect\Support\Arr; |
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use GuzzleHttp\Promise\EachPromise; |
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use Psr\Http\Message\ResponseInterface; |
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use GuzzleHttp\Exception\RequestException; |
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use GrahamCampbell\GuzzleFactory\GuzzleFactory; |
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use PubPeerFoundation\PublicationDataExtractor\Resources\Resource; |
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use PubPeerFoundation\PublicationDataExtractor\Identifiers\Identifier; |
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class Fetcher |
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{ |
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/** |
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* @var Identifier |
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*/ |
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protected $identifier; |
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/** |
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* @var \GuzzleHttp\Client |
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*/ |
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protected $client; |
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/** |
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* @var array |
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*/ |
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protected $apiData = []; |
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/** |
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* @var array |
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*/ |
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protected $resources = []; |
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/** |
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* @var array |
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*/ |
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protected $resourcesToFetch = []; |
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/** |
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* @var array |
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*/ |
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protected $errors = []; |
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/** |
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* The Output object. |
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* |
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* @var Output |
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*/ |
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protected $output; |
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/** |
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* ApiDataFetcher constructor. |
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* |
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* @param Identifier $identifier |
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*/ |
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public function __construct(Identifier $identifier) |
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{ |
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$this->identifier = $identifier; |
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$this->resourcesToFetch = $identifier->getRelatedResources(); |
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$this->output = new Output(); |
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$this->client = GuzzleFactory::make(compact('headers'), 100); |
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} |
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/** |
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* Fetch Data and return Output. |
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* |
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* @return Output |
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*/ |
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public function fetch(): Output |
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{ |
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$this->fetchResources(); |
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$this->fetchComplementaryResources(); |
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$this->output->resetLists(); |
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return $this->output; |
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} |
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/** |
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* Fetch resources. |
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*/ |
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protected function fetchResources(): void |
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{ |
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(new EachPromise($this->getPromises(), [ |
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'concurrency' => 5, |
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'fulfilled' => function (ResponseInterface $response, $index) { |
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$this->apiData[] = $this->getResourceAtIndex($index) |
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->getDataFrom((string) $response->getBody()); |
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}, |
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'rejected' => function (RequestException $exception, $index) { |
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$resourceName = get_class_name($this->getResourceAtIndex($index)); |
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$this->errors[$resourceName] = $exception->getCode(); |
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}, |
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]))->promise()->wait(); |
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} |
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/** |
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* Get list of API calls promises. |
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* |
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* @return Generator |
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*/ |
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protected function getPromises(): Generator |
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{ |
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foreach ($this->resourcesToFetch as $resourceClass) { |
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$resource = $this->instantiateResource($resourceClass); |
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$promise = $this->client->requestAsync( |
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'GET', |
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$resource->getApiUrl(), |
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$resource->getRequestOptions() |
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); |
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yield $promise; |
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} |
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} |
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/** |
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* Get errors as array. |
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* |
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* @return array |
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*/ |
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public function getErrors(): array |
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{ |
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return $this->errors; |
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} |
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/** |
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* Get resource instance from resources array. |
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* |
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* @param int $index |
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* |
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* @return resource |
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*/ |
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protected function getResourceAtIndex(int $index): Resource |
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{ |
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return $this->resources[$index]; |
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} |
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/** |
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* Create and store an instance of the Resource class. |
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* |
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* @param string $resourceClass |
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* |
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* @return resource |
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*/ |
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protected function instantiateResource($resourceClass): Resource |
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{ |
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return $this->resources[] = new $resourceClass($this->identifier, $this->output); |
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} |
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/** |
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* Fetch again with new related Identifiers. |
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*/ |
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protected function fetchComplementaryResources() |
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{ |
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$flatIdentifiers = Arr::flatten(Arr::pluck($this->apiData, 'identifiers')); |
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foreach ($this->identifier->getComplementaryResources() as $key => $value) { |
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if (false !== $valueKey = array_search($key, $flatIdentifiers)) { |
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try { |
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$this->identifier = (new IdentifierResolver($flatIdentifiers[$valueKey - 1]))->handle(); |
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$this->resourcesToFetch = [$value]; |
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$this->resources = []; |
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$this->fetchResources(); |
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} catch (Exceptions\UnknownIdentifierException $e) { |
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continue; |
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} |
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} |
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} |
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} |
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} |
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PubPeerFoundation /
PublicationDataExtractor
