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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\Language\AST\Node\DocumentNode; |
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use Digia\GraphQL\Language\AST\NodeKindEnum; |
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use Digia\GraphQL\Type\Schema; |
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/** |
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* Class Execution |
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* @package Digia\GraphQL\Execution |
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*/ |
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class Execution |
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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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* Execution constructor. |
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* @param ExecutionContext $context |
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*/ |
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public function __construct(ExecutionContext $context) |
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{ |
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$this->context = $context; |
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} |
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/** |
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* @param Schema $schema |
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* @param DocumentNode $documentNode |
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* @param null $rootValue |
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* @param null $contextValue |
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* @param null $variableValues |
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* @param null $operationName |
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* @param callable|null $fieldResolver |
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* @return ExecutionResult |
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*/ |
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public static function execute( |
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Schema $schema, |
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DocumentNode $documentNode, |
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$rootValue = null, |
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$contextValue = null, |
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$variableValues = null, |
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$operationName = null, |
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callable $fieldResolver = null |
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) { |
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try { |
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$context = self::buildExecutionContext( |
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$schema, |
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$documentNode, |
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$rootValue, |
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$contextValue, |
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$variableValues, |
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$operationName, |
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$fieldResolver |
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); |
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} catch (GraphQLError $error) { |
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return new ExecutionResult(['data' => null], [$error]); |
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} |
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$data = $context->getExecutionStrategy()->execute(); |
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return new ExecutionResult($data, $context->getErrors()); |
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} |
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/** |
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* @TODO: Consider to create a ExecutionContextBuilder |
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* @param Schema $schema |
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* @param DocumentNode $documentNode |
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* @param $rootValue |
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* @param $contextValue |
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* @param $rawVariableValues |
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* @param null $operationName |
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* @param callable|null $fieldResolver |
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* @throws GraphQLError |
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* @return ExecutionContext |
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*/ |
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private static function buildExecutionContext( |
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Schema $schema, |
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DocumentNode $documentNode, |
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$rootValue, |
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$contextValue, |
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$rawVariableValues, |
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$operationName = null, |
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callable $fieldResolver = null |
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): ExecutionContext { |
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//TODO: Validate raw variables, operation name etc. |
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//TODO: Validate document definition |
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$errors = []; |
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$fragments = []; |
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$operation = null; |
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foreach ($documentNode->getDefinitions() as $definition) { |
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switch ($definition->getKind()) { |
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case NodeKindEnum::OPERATION_DEFINITION: |
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if (!$operationName && $operation) { |
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throw new GraphQLError( |
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'Must provide operation name if query contains multiple operations.' |
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); |
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} |
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if (!$operationName || (!empty($definition->getName()) && $definition->getName()->getValue() === $operationName)) { |
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$operation = $definition; |
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} |
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break; |
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case NodeKindEnum::FRAGMENT_DEFINITION: |
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case NodeKindEnum::FRAGMENT_SPREAD: |
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$fragments[$definition->getName()->getValue()] = $definition; |
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break; |
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default: |
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throw new GraphQLError( |
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"GraphQL cannot execute a request containing a {$definition->getKind()}." |
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); |
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} |
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} |
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$executionContext = new ExecutionContext( |
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$schema, |
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$fragments, |
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$rootValue, |
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$contextValue, |
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$rawVariableValues, |
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$fieldResolver, |
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$operation, |
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$errors |
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); |
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return $executionContext; |
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} |
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} |
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