public function query(string $nameServer, Query $query) : PromiseInterface
{
return $this->cache->lookup($query)->then(function ($cachedRecords) use($query) {
return $this->buildResponse($query, $cachedRecords);
}, function () use($nameServer, $query) {
return $this->executor->query($nameServer, $query)->then(function ($response) use($query) {
$this->cache->storeResponseMessage($query->getCurrentTime(), $response);
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);
}
protected function resolveInternal(string $nameServer, Query $query)
{
return $this->executor->query($nameServer, $query)->then(function (Message $response) use($query) {
return $this->extractAddress($query, $response);
});
}
