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<?php |
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namespace Drupal\graphql\GraphQL\Execution; |
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use Drupal\graphql\GraphQL\Execution\Visitor\VisitorInterface; |
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use Youshido\GraphQL\Exception\ResolveException; |
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use Youshido\GraphQL\Execution\DeferredResolverInterface; |
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use Youshido\GraphQL\Execution\DeferredResult; |
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use Youshido\GraphQL\Execution\Processor as BaseProcessor; |
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use Youshido\GraphQL\Execution\Request; |
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use Youshido\GraphQL\Field\FieldInterface; |
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use Youshido\GraphQL\Parser\Parser; |
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use Youshido\GraphQL\Schema\AbstractSchema; |
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use Youshido\GraphQL\Type\Enum\AbstractEnumType; |
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use Youshido\GraphQL\Type\Scalar\AbstractScalarType; |
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use Youshido\GraphQL\Validator\RequestValidator\RequestValidator; |
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class Processor extends BaseProcessor { |
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/** |
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* @var \Drupal\graphql\GraphQL\Execution\Reducer |
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*/ |
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protected $requestReducer; |
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/** |
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* Processor constructor. |
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* |
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* @param \Youshido\GraphQL\Schema\AbstractSchema $schema |
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* @param $query |
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* @param array $variables |
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*/ |
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public function __construct(AbstractSchema $schema, $query, array $variables = []) { |
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parent::__construct($schema); |
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$parser = new Parser(); |
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$request = new Request($parser->parse($query), $variables); |
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// Validation of the query payload. This does not take into consideration |
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// any schema specifics and simply validations the structure of the query. |
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$validator = new RequestValidator(); |
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$validator->validate($request); |
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// Set the request in the execution context. |
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$this->executionContext->setRequest($request); |
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// Create a request reducer for our query visitors. |
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$this->requestReducer = new Reducer($this->executionContext); |
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} |
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/** |
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* @param \Drupal\graphql\GraphQL\Execution\Visitor\VisitorInterface $visitor |
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* @param callable $callback |
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* |
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* @return null |
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*/ |
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public function reduceRequest(VisitorInterface $visitor, callable $callback) { |
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try { |
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$result = $this->requestReducer->reduceRequest($visitor); |
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// Call the 'finish' callback. This is useful because that way the |
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// exceptions are caught here and can be written into the execution |
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// context. |
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return $callback($result); |
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} |
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catch (ResolveException $exception) { |
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$this->executionContext->addError($exception); |
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} |
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return NULL; |
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} |
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/** |
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* @return array|mixed |
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*/ |
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public function resolveRequest() { |
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$output = []; |
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if (!$this->executionContext->hasErrors()) { |
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try { |
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$operations = $this->executionContext->getRequest()->getAllOperations(); |
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foreach ($operations as $query) { |
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if ($result = $this->resolveQuery($query)) { |
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$output = array_replace_recursive($output, $result); |
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}; |
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} |
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// If the processor found any deferred results, resolve them now. |
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if (!empty($output) && (!empty($this->deferredResultsLeaf) || !empty($this->deferredResultsComplex))) { |
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try { |
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while ($resolver = array_shift($this->deferredResultsComplex)) { |
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$resolver->resolve(); |
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} |
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// Deferred scalar and enum fields should be resolved last to pick up |
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// as many as possible for a single batch. |
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while ($resolver = array_shift($this->deferredResultsLeaf)) { |
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$resolver->resolve(); |
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} |
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} |
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catch (ResolveException $exception) { |
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$this->executionContext->addError($exception); |
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} |
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finally { |
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$output = static::unpackDeferredResults($output); |
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} |
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} |
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} |
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catch (ResolveException $exception) { |
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$this->executionContext->addError($exception); |
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} |
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} |
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return $output; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function deferredResolve($resolvedValue, FieldInterface $field, callable $callback) { |
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if ($resolvedValue instanceof DeferredResolverInterface) { |
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$deferredResult = new DeferredResult($resolvedValue, function ($resolvedValue) use ($field, $callback) { |
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// Allow nested deferred resolvers. |
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return $this->deferredResolve($resolvedValue, $field, $callback); |
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}); |
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// Whenever we stumble upon a deferred resolver, add it to the queue to be |
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// resolved later. |
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$type = $field->getType()->getNamedType(); |
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if ($type instanceof AbstractScalarType || $type instanceof AbstractEnumType) { |
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array_push($this->deferredResultsLeaf, $deferredResult); |
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} |
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else { |
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array_push($this->deferredResultsComplex, $deferredResult); |
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} |
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return $deferredResult; |
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} |
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// For simple values, invoke the callback immediately. |
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return $callback($resolvedValue); |
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} |
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} |
drupal-graphql /
graphql
