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<?php |
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namespace Thruster\Component\Dns; |
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use Thruster\Component\Dns\Exception\BadServerException; |
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use Thruster\Component\Dns\Exception\TimeoutException; |
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use Thruster\Component\EventLoop\EventLoopInterface; |
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use Thruster\Component\Promise\Deferred; |
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use Thruster\Component\Promise\PromiseInterface; |
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use Thruster\Component\Socket\Connection; |
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use Thruster\Component\Socket\Exception\ConnectionException; |
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/** |
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* Class Executor |
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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 Executor implements ExecutorInterface |
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{ |
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/** |
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* @var EventLoopInterface |
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*/ |
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private $loop; |
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/** |
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* @var Parser |
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*/ |
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private $parser; |
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/** |
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* @var Dumper |
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*/ |
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private $dumper; |
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/** |
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* @var int |
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*/ |
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private $timeout; |
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public function __construct(EventLoopInterface $loop, int $timeout = 5) |
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{ |
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$this->loop = $loop; |
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$this->parser = new Parser(); |
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$this->dumper = new Dumper(); |
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$this->timeout = $timeout; |
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} |
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public function query(string $nameServer, Query $query) : PromiseInterface |
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{ |
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$request = $this->prepareRequest($query); |
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$queryData = $this->dumper->toBinary($request); |
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$transport = strlen($queryData) > 512 ? 'tcp' : 'udp'; |
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return $this->doQuery($nameServer, $transport, $queryData, $query->getName()); |
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} |
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private function prepareRequest(Query $query) |
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{ |
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$request = new Message(); |
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$request->header->set('id', $this->generateId()); |
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$request->header->set('rd', 1); |
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$request->questions[] = $query; |
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$request->prepare(); |
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return $request; |
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} |
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private function doQuery($nameServer, $transport, $queryData, $name) : PromiseInterface |
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{ |
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$response = new Message(); |
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$deferred = new Deferred(); |
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$retryWithTcp = function () use ($nameServer, $queryData, $name) { |
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return $this->doQuery($nameServer, 'tcp', $queryData, $name); |
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}; |
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$connection = $this->createConnection($nameServer, $transport); |
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$timer = $this->loop->addTimer($this->timeout, function () use ($connection, $name, $deferred) { |
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$connection->close(); |
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$deferred->reject(new TimeoutException($name)); |
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}); |
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$connection->on( |
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'data', |
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function ($data) use ($retryWithTcp, $connection, &$response, $transport, $deferred, $timer) { |
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$responseReady = $this->parser->parseChunk($data, $response); |
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if (!$responseReady) { |
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return; |
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} |
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$timer->cancel(); |
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if ($response->header->isTruncated()) { |
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if ('tcp' === $transport) { |
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$deferred->reject( |
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new BadServerException( |
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'The server set the truncated bit although we issued a TCP request' |
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) |
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); |
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} else { |
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$connection->end(); |
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$deferred->resolve($retryWithTcp()); |
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} |
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return; |
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} |
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$connection->end(); |
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$deferred->resolve($response); |
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} |
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); |
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$connection->write($queryData); |
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return $deferred->promise(); |
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} |
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private function generateId() : int |
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{ |
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return mt_rand(0, 0xffff); |
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} |
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private function createConnection($nameServer, $transport) : Connection |
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{ |
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$fd = stream_socket_client( |
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$transport . '://' . $nameServer, |
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$errNo, |
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$errStr, |
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0, |
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STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT |
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); |
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if (false === $fd) { |
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$message = sprintf( |
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'Could not bind to %s://%s: %s', |
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$transport, |
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$nameServer, |
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$errStr |
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); |
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throw new ConnectionException($message, $errNo); |
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} |
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stream_set_blocking($fd, 0); |
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$connection = new Connection($fd, $this->loop); |
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return $connection; |
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} |
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} |
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ThrusterIO /
dns
