Youshido /
GraphQL
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Processor often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Processor, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 40 | class Processor |
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| 41 | { |
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| 42 | |||
| 43 | const TYPE_NAME_QUERY = '__typename'; |
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| 44 | |||
| 45 | /** @var array */ |
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| 46 | protected $data; |
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| 47 | |||
| 48 | /** @var ResolveValidatorInterface */ |
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| 49 | protected $resolveValidator; |
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| 50 | |||
| 51 | /** @var ExecutionContext */ |
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| 52 | protected $executionContext; |
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| 53 | |||
| 54 | /** @var int */ |
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| 55 | protected $maxComplexity; |
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| 56 | |||
| 57 | 29 | public function __construct(AbstractSchema $schema) |
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| 58 | { |
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| 59 | 29 | (new SchemaValidator())->validate($schema); |
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| 60 | |||
| 61 | 28 | $this->introduceIntrospectionFields($schema); |
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| 62 | 28 | $this->executionContext = new ExecutionContext(); |
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| 63 | 28 | $this->executionContext->setSchema($schema); |
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| 64 | |||
| 65 | 28 | $this->resolveValidator = new ResolveValidator($this->executionContext); |
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| 66 | 28 | } |
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| 67 | |||
| 68 | |||
| 69 | 27 | public function processPayload($payload, $variables = [], $reducers = []) |
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| 70 | { |
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| 71 | 27 | if ($this->executionContext->hasErrors()) { |
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| 72 | 7 | $this->executionContext->clearErrors(); |
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| 73 | 7 | } |
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| 74 | |||
| 75 | 27 | $this->data = []; |
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| 76 | |||
| 77 | try { |
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| 78 | 27 | $this->parseAndCreateRequest($payload, $variables); |
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| 79 | |||
| 80 | 27 | $queryType = $this->executionContext->getSchema()->getQueryType(); |
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| 81 | 27 | $mutationType = $this->executionContext->getSchema()->getMutationType(); |
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| 82 | |||
| 83 | 27 | if ($this->maxComplexity) { |
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| 84 | 1 | $reducers[] = new MaxComplexityQueryVisitor($this->maxComplexity); |
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| 85 | 1 | } |
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| 86 | |||
| 87 | 27 | $this->reduceQuery($queryType, $mutationType, $reducers); |
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| 88 | |||
| 89 | 27 | foreach ($this->executionContext->getRequest()->getOperationsInOrder() as $operation) { |
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| 90 | 27 | if ($operationResult = $this->executeOperation($operation, $operation instanceof Mutation ? $mutationType : $queryType)) { |
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| 91 | 24 | $this->data = array_merge($this->data, $operationResult); |
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| 92 | 24 | }; |
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| 93 | 27 | } |
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| 94 | |||
| 95 | 27 | } catch (\Exception $e) { |
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| 96 | 4 | $this->executionContext->addError($e); |
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| 97 | } |
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| 98 | |||
| 99 | 27 | return $this; |
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| 100 | } |
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| 101 | |||
| 102 | 27 | protected function parseAndCreateRequest($payload, $variables = []) |
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| 112 | |||
| 113 | /** |
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| 114 | * @param Query|Field $query |
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| 115 | * @param AbstractObjectType $currentLevelSchema |
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| 116 | * @return array|bool|mixed |
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| 117 | */ |
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| 118 | 27 | protected function executeOperation(Query $query, $currentLevelSchema) |
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| 134 | |||
| 135 | /** |
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| 136 | * @param Query $query |
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| 137 | * @param AbstractField $field |
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| 138 | * @param $contextValue |
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| 139 | * @return array|mixed|null |
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| 140 | */ |
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| 141 | 24 | protected function processQueryAST(Query $query, AbstractField $field, $contextValue = null) |
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| 155 | |||
| 156 | /** |
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| 157 | * @param Query|Mutation $query |
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| 158 | * @param AbstractType $fieldType |
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| 159 | * @param mixed $resolvedValue |
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| 160 | * @return array|mixed |
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| 161 | */ |
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| 162 | 24 | protected function collectValueForQueryWithType(Query $query, AbstractType $fieldType, $resolvedValue) |
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| 211 | |||
| 212 | /** |
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| 213 | * @param FieldAst $fieldAst |
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| 214 | * @param AbstractField $field |
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| 215 | * |
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| 216 | * @param mixed $contextValue |
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| 217 | * @return array|mixed|null |
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| 218 | * @throws ResolveException |
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| 219 | * @throws \Exception |
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| 220 | 19 | */ |
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| 221 | protected function processFieldAST(FieldAst $fieldAst, AbstractField $field, $contextValue) |
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| 242 | |||
| 243 | /** |
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| 244 | * @param AbstractField $field |
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| 245 | * @param mixed $contextValue |
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| 246 | * @param Query $query |
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| 247 | * |
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| 248 | * @return mixed |
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| 249 | 24 | */ |
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| 250 | protected function resolveFieldValue(AbstractField $field, $contextValue, Query $query) |
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| 260 | 24 | ||
| 261 | 24 | protected function createResolveInfo($field, $fields) |
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| 265 | |||
| 266 | /** |
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| 267 | * @param $contextValue |
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| 268 | * @param FieldAst $fieldAst |
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| 269 | * @param AbstractField $field |
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| 270 | * |
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| 271 | * @throws \Exception |
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| 272 | * |
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| 273 | 19 | * @return mixed |
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| 274 | */ |
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| 275 | 19 | protected function getPreResolvedValue($contextValue, FieldAst $fieldAst, AbstractField $field) |
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| 284 | |||
| 285 | /** |
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| 286 | * @param $field AbstractField |
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| 287 | * @param $query Query |
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| 288 | 19 | * |
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| 289 | 14 | * @return array |
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| 290 | 8 | */ |
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| 291 | 6 | protected function parseArgumentsValues(AbstractField $field, Query $query) |
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| 302 | |||
| 303 | /** |
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| 304 | * @param $query Query|FragmentInterface |
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| 305 | * @param $queryType AbstractObjectType|TypeInterface|Field|AbstractType |
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| 306 | * @param $resolvedValue mixed |
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| 307 | * @param $value array |
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| 308 | * |
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| 309 | 24 | * @throws \Exception |
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| 310 | * |
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| 311 | 24 | * @return array |
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| 312 | 24 | */ |
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| 313 | 15 | protected function processQueryFields($query, AbstractType $queryType, $resolvedValue, $value) |
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| 370 | 3 | ||
| 371 | protected function getFieldValidatedValue(AbstractField $field, $value) |
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| 375 | 10 | ||
| 376 | 20 | protected function getOutputValue(AbstractType $type, $value) |
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| 380 | |||
| 381 | protected function introduceIntrospectionFields(AbstractSchema $schema) |
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| 387 | |||
| 388 | public function getResponseData() |
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| 402 | 28 | ||
| 403 | 28 | /** |
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| 404 | 28 | * Convenience function for attaching a MaxComplexityQueryVisitor($max) to the next processor run |
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| 405 | * |
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| 406 | 27 | * @param int $max |
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| 407 | */ |
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| 408 | 27 | public function setMaxComplexity($max) |
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| 412 | 24 | ||
| 413 | /** |
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| 414 | 27 | * Apply all of $reducers to this query. Example reducer operations: checking for maximum query complexity, |
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| 415 | 10 | * performing look-ahead query planning, etc. |
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| 416 | 10 | * |
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| 417 | * @param AbstractType $queryType |
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| 418 | 27 | * @param AbstractType $mutationType |
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| 419 | * @param AbstractQueryVisitor[] $reducers |
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| 420 | */ |
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| 421 | protected function reduceQuery($queryType, $mutationType, array $reducers) |
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| 429 | 1 | ||
| 430 | /** |
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| 431 | * Entry point for the `walkQuery` routine. Execution bounces between here, where the reducer's ->visit() method |
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| 432 | * is invoked, and `walkQuery` where we send in the scores from the `visit` call. |
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| 433 | * |
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| 434 | * @param Query $query |
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| 435 | * @param AbstractType $currentLevelSchema |
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| 436 | * @param AbstractQueryVisitor $reducer |
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| 437 | */ |
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| 438 | protected function doVisit(Query $query, $currentLevelSchema, $reducer) |
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| 465 | |||
| 466 | 2 | /** |
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| 467 | 2 | * Coroutine to walk the query and schema in DFS manner (see AbstractQueryVisitor docs for more info) and yield a |
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| 468 | 2 | * tuple of (queryNode, schemaNode, childScore) |
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| 469 | * |
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| 470 | 2 | * childScore costs are accumulated via values sent into the coroutine. |
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| 471 | * |
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| 472 | * Most of the branching in this function is just to handle the different types in a query: Queries, Unions, |
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| 473 | * Fragments (anonymous and named), and Fields. The core of the function is simple: recurse until we hit the base |
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| 474 | * case of a Field and yield that back up to the visitor up in `doVisit`. |
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| 475 | * |
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| 476 | 2 | * @param Query|Field|FragmentInterface $queryNode |
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| 477 | 2 | * @param AbstractField $currentLevelAST |
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| 478 | 2 | * |
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| 479 | 2 | * @return \Generator |
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| 480 | 2 | */ |
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| 481 | 2 | protected function walkQuery($queryNode, AbstractField $currentLevelAST) |
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| 534 | } |
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| 535 |
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There are different options of fixing this problem.
If you want to be on the safe side, you can add an additional type-check:
If you are sure that the expression is traversable, you might want to add a doc comment cast to improve IDE auto-completion and static analysis:
Mark the issue as a false-positive: Just hover the remove button, in the top-right corner of this issue for more options.