private function extractAddress(Query $query, Message $response)
{
$answers = $response->answers;
$addresses = $this->resolveAliases($answers, $query->getName());
if (0 === count($addresses)) {
throw new RecordNotFoundException('DNS Request did not return valid answer.');
}
$address = $addresses[array_rand($addresses)];
return $address;
}
private function buildResponse(Query $query, array $cachedRecords) : Message
{
$response = new Message();
$response->header->set('id', $this->generateId());
$response->header->set('qr', 1);
$response->header->set('opcode', Message::OPCODE_QUERY);
$response->header->set('rd', 1);
$response->header->set('rcode', Message::RCODE_OK);
$response->questions[] = new Record($query->getName(), $query->getType(), $query->getClass());
foreach ($cachedRecords as $record) {
$response->answers[] = $record;
}
$response->prepare();
return $response;
}
public function tryQuery(string $nameServer, Query $query, int $retries, Deferred $deferred)
{
$errorCallback = function ($error) use($nameServer, $query, $retries, $deferred) {
if (false === $error instanceof TimeoutException) {
$deferred->reject($error);
return;
}
if (0 >= $retries) {
$error = new \RuntimeException(sprintf("DNS query for %s failed: too many retries", $query->getName()), 0, $error);
$deferred->reject($error);
return;
}
$this->tryQuery($nameServer, $query, $retries - 1, $deferred);
};
$this->executor->query($nameServer, $query)->then([$deferred, 'resolve'], $errorCallback);
}
private function serializeQueryToIdentity(Query $query)
{
return $query->getName() . ':' . $query->getType() . ':' . $query->getClass();
}
