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<?php
/*
* Concrete implementation of query visitor.
*
* Enforces maximum complexity on a query, computed from "cost" functions on
* the fields touched by that query.
* @author Ben Roberts <[email protected]>
* created: 7/11/16 11:05 AM
*/
namespace Youshido\GraphQL\Execution\Visitor;
use Youshido\GraphQL\Config\Field\FieldConfig;
class MaxComplexityQueryVisitor extends AbstractQueryVisitor {
public $maxScore;
protected $defaultScore = 1;
public function __construct($max) {
parent::__construct();
$this->maxScore = $max;
}
/**
* @param array $args
* @param FieldConfig $fieldConfig
* @param int $childScore
* @return int|null
* @throws \Exception
public function visit(array $args, FieldConfig $fieldConfig, $childScore = 0) {
$cost = $fieldConfig->get('cost');
if (is_callable($cost)) {
$cost = $cost($args, $fieldConfig, $childScore);
$cost = $cost ?: $this->defaultScore;
$this->memo += $cost;
if ($this->memo > $this->maxScore) {
throw new \Exception('query exceeded max allowed complexity of ' . $this->maxScore);
return $cost;
Youshido /
GraphQL
