Execution::createContext() - Code Metrics - Inspection of "Move error handling" - digiaonline/graphql-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Pull Request — master (#335)

by Christoffer
created 2018-11-09 09:33 UTC
Execution::createContext() C

↳ Parent: Execution
Complexity

Conditions	12
Paths	21
Size

Total Lines	64
Code Lines	34
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	12
eloc	34
nc	21
nop	7
dl	0
loc	64
rs	6.9666
c	0
b	0
f	0
How to fix Long Method Complexity

<?php

namespace Digia\GraphQL\Execution;

use Digia\GraphQL\Error\ErrorHandlerInterface;
use Digia\GraphQL\Execution\Strategy\FieldCollector;
use Digia\GraphQL\Execution\Strategy\ParallelExecutionStrategy;
use Digia\GraphQL\Execution\Strategy\SerialExecutionStrategy;
use Digia\GraphQL\Language\Node\DocumentNode;
use Digia\GraphQL\Language\Node\FragmentDefinitionNode;
use Digia\GraphQL\Language\Node\FragmentSpreadNode;
use Digia\GraphQL\Language\Node\OperationDefinitionNode;
use Digia\GraphQL\Schema\Schema;
use React\Promise\PromiseInterface;

class Execution implements ExecutionInterface
{
    /**
     * @inheritdoc
     */
    public function execute(
        Schema $schema,
        DocumentNode $documentNode,
        $rootValue = null,
        $contextValue = null,
        array $variableValues = [],
        ?string $operationName = null,
        ?callable $fieldResolver = null,
        ?ErrorHandlerInterface $errorHandler = null
    ): ExecutionResult {
        try {
            $context = $this->createContext(
                $schema,
                $documentNode,
                $rootValue,
                $contextValue,
                $variableValues,
                $operationName,
                $fieldResolver
            );

            // Return early errors if execution context failed.
            if (!empty($context->getErrors())) {
                return new ExecutionResult(null, $context->getErrors());
            }
        } catch (ExecutionException $error) {
            return new ExecutionResult(null, [$error]);
        }

        $valuesResolver = new ValuesResolver();
        $fieldCollector = new FieldCollector($context, $valuesResolver);

        $data = $this->executeOperation($operationName, $context, $fieldCollector, $valuesResolver);

        if ($data instanceof PromiseInterface) {
            $data->then(function ($resolvedData) use (&$data) {
                $data = $resolvedData;
            });
        }

        if (null !== $errorHandler) {
            foreach ($context->getErrors() as $error) {
                $errorHandler->handleError($error);
            }
        }

        return new ExecutionResult($data, $context->getErrors());
    }

    /**
     * @param null|string                $operationName
     * @param ExecutionContext           $context
     * @param FieldCollector             $fieldCollector
     * @param ValuesResolver             $valuesResolver
     * @param ErrorHandlerInterface|null $errorHandler
     * @return array|mixed|null|PromiseInterface
     */
    protected function executeOperation(
        ?string $operationName,
        ExecutionContext $context,
        FieldCollector $fieldCollector,
        ValuesResolver $valuesResolver,
        ?ErrorHandlerInterface $errorHandler = null
        /** @scrutinizer ignore-unused */ ?ErrorHandlerInterface $errorHandler = null
    ) {
        $strategy = $operationName === 'mutation'
            ? new SerialExecutionStrategy($context, $fieldCollector, $valuesResolver)
            : new ParallelExecutionStrategy($context, $fieldCollector, $valuesResolver);

        $result = null;


        try {
            $result = $strategy->execute();
        } catch (ExecutionException $exception) {
            $context->addError($exception);
        } catch (\Throwable $exception) {
            $context->addError(
                new ExecutionException($exception->getMessage(), null, null, null, null, null, $exception)
            );
        }

        if ($result instanceof PromiseInterface) {
            return $result->then(null, function (ExecutionException $exception) use ($context) {
                $context->addError($exception);
                return \React\Promise\resolve(null);
            });
        }

        return $result;
    }

    /**
     * @param Schema        $schema
     * @param DocumentNode  $documentNode
     * @param mixed         $rootValue
     * @param mixed         $contextValue
     * @param mixed         $rawVariableValues
     * @param null|string   $operationName
     * @param callable|null $fieldResolver
     * @return ExecutionContext
     * @throws ExecutionException
     */
    protected function createContext(
        Schema $schema,
        DocumentNode $documentNode,
        $rootValue,
        $contextValue,
        $rawVariableValues,
        ?string $operationName = null,
        ?callable $fieldResolver = null
    ): ExecutionContext {
        $errors    = [];
        $fragments = [];
        $operation = null;

        foreach ($documentNode->getDefinitions() as $definition) {
            if ($definition instanceof OperationDefinitionNode) {
                if (null === $operationName && null !== $operation) {
                    throw new ExecutionException(
                        'Must provide operation name if query contains multiple operations.'
                    );
                }

                if (null === $operationName || $definition->getNameValue() === $operationName) {
                    $operation = $definition;
                }

                continue;
            }

            if ($definition instanceof FragmentDefinitionNode || $definition instanceof FragmentSpreadNode) {
                $fragments[$definition->getNameValue()] = $definition;

                continue;
            }
        }

        if (null === $operation) {
            if (null !== $operationName) {
                throw new ExecutionException(sprintf('Unknown operation named "%s".', $operationName));
            }

            throw new ExecutionException('Must provide an operation.');
        }

        $coercedVariableValues = (new ValuesResolver())->coerceVariableValues(
            $schema,
            $operation->getVariableDefinitions(),
            $rawVariableValues
        );

        $variableValues = $coercedVariableValues->getValue();

        if ($coercedVariableValues->hasErrors()) {
            $errors = $coercedVariableValues->getErrors();
        }

        return new ExecutionContext(
            $schema,
            $fragments,
            $rootValue,
            $contextValue,
            $variableValues,
            $fieldResolver,
            $operation,
            $errors
        );
    }
}

digiaonline / graphql-php

Pull Request — master (#335)

Execution::createContext() C

Complexity

Size

Duplication

Importance

How to fix Long Method Complexity

Long Method

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