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<?php |
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namespace Digia\GraphQL\Execution; |
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use Digia\GraphQL\Error\GraphQLError; |
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use Digia\GraphQL\Execution\Resolver\ResolveInfo; |
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use Digia\GraphQL\Language\AST\Node\FieldNode; |
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use Digia\GraphQL\Language\AST\Node\FragmentDefinitionNode; |
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use Digia\GraphQL\Language\AST\Node\OperationDefinitionNode; |
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use Digia\GraphQL\Language\AST\Node\SelectionSetNode; |
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use Digia\GraphQL\Language\AST\NodeKindEnum; |
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use Digia\GraphQL\Type\Definition\Field; |
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use Digia\GraphQL\Type\Definition\ObjectType; |
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use Digia\GraphQL\Type\Schema; |
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use function Digia\GraphQL\Type\SchemaMetaFieldDefinition; |
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use function Digia\GraphQL\Type\TypeMetaFieldDefinition; |
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use function Digia\GraphQL\Type\TypeNameMetaFieldDefinition; |
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/** |
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* Class AbstractStrategy |
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* @package Digia\GraphQL\Execution\Strategies |
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*/ |
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abstract class ExecutionStrategy |
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{ |
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/** |
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* @var ExecutionContext |
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*/ |
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protected $context; |
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/** |
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* @var OperationDefinitionNode |
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*/ |
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protected $operation; |
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/** |
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* @var mixed |
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*/ |
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protected $rootValue; |
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/** |
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* @var array |
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*/ |
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protected $finalResult; |
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/** |
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* AbstractStrategy constructor. |
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* @param ExecutionContext $context |
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* |
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* @param OperationDefinitionNode $operation |
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*/ |
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public function __construct( |
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ExecutionContext $context, |
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OperationDefinitionNode $operation, |
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$rootValue |
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) { |
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$this->context = $context; |
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$this->operation = $operation; |
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$this->rootValue = $rootValue; |
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} |
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/** |
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* @return array|null |
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*/ |
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abstract function execute(): ?array; |
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/** |
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* @param ObjectType $runtimeType |
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* @param SelectionSetNode $selectionSet |
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* @param $fields |
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* @param $visitedFragmentNames |
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* @return \ArrayObject |
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* @throws \Exception |
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*/ |
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protected function collectFields( |
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ObjectType $runtimeType, |
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SelectionSetNode $selectionSet, |
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$fields, |
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$visitedFragmentNames |
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) { |
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foreach ($selectionSet->getSelections() as $selection) { |
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/** @var FieldNode $selection */ |
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switch ($selection->getKind()) { |
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case NodeKindEnum::FIELD: |
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$name = $this->getFieldNameKey($selection); |
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if (!isset($runtimeType->getFields()[$selection->getNameValue()])) { |
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continue 2; |
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} |
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if (!isset($fields[$name])) { |
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$fields[$name] = new \ArrayObject(); |
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} |
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$fields[$name][] = $selection; |
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break; |
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case NodeKindEnum::INLINE_FRAGMENT: |
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//TODO check if should include this node |
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$this->collectFields( |
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$runtimeType, |
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$selection->getSelectionSet(), |
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$fields, |
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$visitedFragmentNames |
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); |
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break; |
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case NodeKindEnum::FRAGMENT_SPREAD: |
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//TODO check if should include this node |
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if (!empty($visitedFragmentNames[$selection->getNameValue()])) { |
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continue 2; |
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} |
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$visitedFragmentNames[$selection->getNameValue()] = true; |
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/** @var FragmentDefinitionNode $fragment */ |
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$fragment = $this->context->getFragments()[$selection->getNameValue()]; |
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$this->collectFields( |
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$runtimeType, |
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$fragment->getSelectionSet(), |
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$fields, |
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$visitedFragmentNames |
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); |
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break; |
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} |
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} |
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return $fields; |
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} |
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/** |
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* @TODO: consider to move this to FieldNode |
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* @param FieldNode $node |
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* @return string |
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*/ |
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private function getFieldNameKey(FieldNode $node) |
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{ |
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return $node->getAlias() ? $node->getAlias()->getValue() : $node->getNameValue(); |
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} |
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/** |
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* Implements the "Evaluating selection sets" section of the spec |
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* for "read" mode. |
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* @param ObjectType $parentType |
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* @param $source |
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* @param $path |
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* @param $fields |
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* |
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* @return array |
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* |
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* @throws GraphQLError|\Exception |
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* @throws \TypeError |
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*/ |
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protected function executeFields( |
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ObjectType $parentType, |
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$source, |
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$path, |
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$fields |
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): array { |
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$finalResults = []; |
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foreach ($fields as $fieldName => $fieldNodes) { |
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$fieldPath = $path; |
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$fieldPath[] = $fieldName; |
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$result = $this->resolveField($parentType, |
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$source, |
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$fieldNodes, |
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$fieldPath |
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); |
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$finalResults[$fieldName] = $result; |
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} |
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return $finalResults; |
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} |
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/** |
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* @param Schema $schema |
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* @param ObjectType $parentType |
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* @param string $fieldName |
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* @return \Digia\GraphQL\Type\Definition\Field|null |
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* @throws \Exception |
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* @throws \TypeError |
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*/ |
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public function getFieldDefinition(Schema $schema, ObjectType $parentType, string $fieldName) |
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{ |
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if ($fieldName === SchemaMetaFieldDefinition()->getName() && $schema->getQuery() === $parentType) { |
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return SchemaMetaFieldDefinition(); |
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} |
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if ($fieldName === TypeMetaFieldDefinition()->getName() && $schema->getQuery() === $parentType) { |
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return TypeNameMetaFieldDefinition(); |
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} |
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if ($fieldName === TypeNameMetaFieldDefinition()->getName()) { |
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return TypeNameMetaFieldDefinition(); |
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} |
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$fields = $parentType->getFields(); |
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return isset($fields[$fieldName]) ? $fields[$fieldName] : null; |
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} |
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/** |
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* @param ObjectType $parentType |
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* @param $source |
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* @param $fieldNodes |
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* @param $path |
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* |
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* @return mixed |
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* |
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* @throws GraphQLError|\Exception |
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* @throws \TypeError |
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*/ |
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protected function resolveField( |
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ObjectType $parentType, |
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$source, |
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$fieldNodes, |
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$path |
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) { |
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/** @var FieldNode $fieldNode */ |
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$fieldNode = $fieldNodes[0]; |
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$field = $this->getFieldDefinition($this->context->getSchema(), $parentType, $fieldNode->getNameValue()); |
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if (!$field) { |
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return null; |
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} |
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$info = $this->buildResolveInfo($fieldNodes, $fieldNode, $field, $parentType, $path, $this->context); |
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$resolveFunction = $this->determineResolveFunction($field, $parentType, $this->context); |
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$result = $this->resolveOrError( |
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$field, |
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$fieldNode, |
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$resolveFunction, |
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$source, |
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$this->context, |
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$info |
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); |
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$result = $this->collectAndExecuteSubFields( |
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$parentType, |
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$fieldNodes, |
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$info, |
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$path, |
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$result// $result is passed as $source |
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); |
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return $result; |
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} |
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/** |
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* @param array $fieldNodes |
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* @param FieldNode $fieldNode |
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* @param Field $field |
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* @param ObjectType $parentType |
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* @param $path |
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* @param ExecutionContext $context |
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* @return ResolveInfo |
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*/ |
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private function buildResolveInfo(\ArrayAccess $fieldNodes, FieldNode $fieldNode, Field $field, ObjectType $parentType, $path, ExecutionContext $context) |
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{ |
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return new ResolveInfo([ |
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'fieldName' => $fieldNode->getNameValue(), |
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'fieldNodes' => $fieldNodes, |
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'returnType' => $field->getType(), |
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'parentType' => $parentType, |
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'path' => $path, |
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'schema' => $context->getSchema(), |
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'fragments' => $context->getFragments(), |
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'rootValue' => $context->getRootValue(), |
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'operation' => $context->getOperation(), |
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'variableValues' => $context->getVariableValues(), |
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]); |
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} |
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/** |
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* @param Field $field |
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* @param ObjectType $parentType |
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* @param ExecutionContext $context |
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* @return callable|mixed|null |
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*/ |
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private function determineResolveFunction(Field $field, ObjectType $parentType, ExecutionContext $context) |
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{ |
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if ($field->hasResolve()) { |
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return $field->getResolve(); |
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} |
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285
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286
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if ($parentType->hasResolve()) { |
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return $parentType->getResolve(); |
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} |
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290
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return $this->context->getFieldResolver(); |
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} |
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293
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294
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/** |
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295
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* @param Field $field |
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296
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* @param FieldNode $fieldNode |
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297
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* @param callable $resolveFunction |
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298
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* @param $source |
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299
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* @param ExecutionContext $context |
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300
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* @param ResolveInfo $info |
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301
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* @return array|\Exception|\Throwable |
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302
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*/ |
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303
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private function resolveOrError( |
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304
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Field $field, |
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FieldNode $fieldNode, |
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306
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callable $resolveFunction, |
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307
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$source, |
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308
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ExecutionContext $context, |
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309
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ResolveInfo $info |
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310
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) { |
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311
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try { |
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312
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$args = getArgumentValues($field, $fieldNode, $context->getVariableValues()); |
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313
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314
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return $resolveFunction($source, $args, $context, $info); |
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315
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} catch (\Exception $error) { |
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316
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return $error; |
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317
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} catch (\Throwable $error) { |
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318
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return $error; |
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319
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} |
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320
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} |
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321
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322
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/** |
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323
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* @param ObjectType $returnType |
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324
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* @param FieldNode[] $fieldNodes |
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325
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* @param ResolveInfo $info |
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326
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* @param array $path |
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327
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* @return array|\stdClass |
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328
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* @throws GraphQLError |
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329
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* @throws \Exception |
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330
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* @throws \TypeError |
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331
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*/ |
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332
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private function collectAndExecuteSubFields( |
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333
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ObjectType $returnType, |
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334
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$fieldNodes, |
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335
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ResolveInfo $info, |
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|
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|
336
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$path, |
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337
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&$result |
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338
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) |
|
339
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{ |
|
340
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$subFields = new \ArrayObject(); |
|
341
|
|
|
|
|
342
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foreach ($fieldNodes as $fieldNode) { |
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343
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|
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if ($fieldNode->getSelectionSet() !== null) { |
|
344
|
|
|
$subFields = $this->collectFields( |
|
345
|
|
|
$returnType, |
|
346
|
|
|
$fieldNode->getSelectionSet(), |
|
347
|
|
|
$subFields, |
|
348
|
|
|
new \ArrayObject() |
|
349
|
|
|
); |
|
350
|
|
|
} |
|
351
|
|
|
} |
|
352
|
|
|
|
|
353
|
|
|
if($subFields->count()) { |
|
354
|
|
|
return $this->executeFields($returnType, $result, $path, $subFields); |
|
355
|
|
|
} |
|
356
|
|
|
|
|
357
|
|
|
return $result; |
|
358
|
|
|
} |
|
359
|
|
|
} |
|
360
|
|
|
|
digiaonline /
graphql-php
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Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.