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<?php |
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namespace Drupal\graphql\Cache\Context; |
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use Drupal\Core\Cache\CacheableMetadata; |
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use Drupal\Core\Cache\Context\CacheContextInterface; |
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use Symfony\Component\HttpFoundation\RequestStack; |
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/** |
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* Defines the QueryCacheContext service, for "per query" caching. |
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* |
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* Cache context ID: 'gql'. |
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*/ |
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class QueryCacheContext implements CacheContextInterface { |
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/** |
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* The request stack. |
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* |
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* @var \Symfony\Component\HttpFoundation\RequestStack |
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*/ |
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protected $requestStack; |
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/** |
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* Static cache of hashed cache contexts. |
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* |
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* @var \SplObjectStorage |
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*/ |
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protected $contextCache; |
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/** |
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* Constructs a new QueryCacheContext class. |
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* |
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* @param \Symfony\Component\HttpFoundation\RequestStack $requestStack |
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* The request stack. |
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*/ |
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public function __construct(RequestStack $requestStack) { |
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$this->requestStack = $requestStack; |
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$this->contextCache = new \SplObjectStorage(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function getLabel() { |
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return t('Query'); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getContext() { |
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$request = $this->requestStack->getCurrentRequest(); |
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if (isset($this->contextCache[$request])) { |
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return $this->contextCache[$request]; |
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} |
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$hash = ''; |
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if ($request->attributes->has('query')) { |
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$hash = $this->contextCache[$request] = $this->getHash( |
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$request->attributes->get('schema') ?: '', |
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$request->attributes->get('query') ?: '', |
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$request->attributes->get('variables') ?: [] |
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); |
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} |
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else if ($request->attributes->has('queries')) { |
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$queries = $request->attributes->get('queries'); |
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$schema = $request->attributes->get('schema') ?: ''; |
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return hash('sha256', json_encode(array_map(function($item) use ($schema) { |
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return $this->getHash( |
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$schema, |
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!empty($item['query']) ? $item['query'] : '', |
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!empty($item['variables']) ? $item['variables'] : [] |
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); |
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}, $queries))); |
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} |
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return $this->contextCache[$request] = $hash; |
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} |
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/** |
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* Produces an optimized hashed string of the query and variables. |
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* |
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* Sorts the variables by their key and eliminates whitespace from the query |
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* to enable better reuse of the cache entries. |
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* |
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* @param string $schema |
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* The schema id. |
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* @param string $query |
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* The graphql query string. |
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* @param array $variables |
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* The graphql query variables. |
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* |
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* @return string |
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* The hashed string containing. |
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*/ |
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protected function getHash($schema = '', $query = '', array $variables = []) { |
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$query = preg_replace('/\s{2,}/', ' ', $query); |
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ksort($variables); |
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return hash('sha256', json_encode([ |
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'schema' => $schema, |
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'query' => $query, |
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'variables' => $variables, |
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])); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCacheableMetadata() { |
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return new CacheableMetadata(); |
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} |
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} |
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drupal-graphql /
graphql
