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<?php |
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namespace Thruster\Component\Dns; |
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use Thruster\Component\Promise\PromiseInterface; |
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/** |
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* Class CachedExecutor |
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* |
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* @package Thruster\Component\Dns |
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* @author Aurimas Niekis <[email protected]> |
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*/ |
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class CachedExecutor implements ExecutorInterface |
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{ |
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/** |
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* @var ExecutorInterface |
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*/ |
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private $executor; |
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/** |
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* @var RecordCache |
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*/ |
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private $cache; |
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public function __construct(ExecutorInterface $executor, RecordCache $cache) |
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{ |
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$this->executor = $executor; |
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$this->cache = $cache; |
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} |
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public function query(string $nameServer, Query $query) : PromiseInterface |
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{ |
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return $this->cache |
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->lookup($query) |
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->then( |
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function ($cachedRecords) use ($query) { |
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return $this->buildResponse($query, $cachedRecords); |
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}, |
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function () use ($nameServer, $query) { |
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return $this->executor |
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->query($nameServer, $query) |
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->then(function ($response) use ($query) { |
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$this->cache->storeResponseMessage($query->getCurrentTime(), $response); |
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return $response; |
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}); |
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} |
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); |
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} |
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private function buildResponse(Query $query, array $cachedRecords) : Message |
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{ |
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$response = new Message(); |
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$response->header->set('id', $this->generateId()); |
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$response->header->set('qr', 1); |
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$response->header->set('opcode', Message::OPCODE_QUERY); |
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$response->header->set('rd', 1); |
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$response->header->set('rcode', Message::RCODE_OK); |
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$response->questions[] = new Record($query->getName(), $query->getType(), $query->getClass()); |
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foreach ($cachedRecords as $record) { |
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$response->answers[] = $record; |
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} |
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$response->prepare(); |
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return $response; |
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} |
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private function generateId() : int |
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{ |
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return mt_rand(0, 0xffff); |
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} |
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} |
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ThrusterIO /
dns
