/**
* {@inheritdoc}
*/
public function connect(string $domain, int $port = null, array $options = []) : \Generator
{
// Check if $domain is actually an IP address.
if (preg_match(self::IP_REGEX, $domain)) {
return yield from $this->connector->connect($domain, $port, $options);
}
$options = array_merge(['name' => $domain], $options);
try {
$ips = (yield from $this->resolver->resolve($domain, $options));
} catch (DnsException $exception) {
throw new FailureException(sprintf('Could not resolve host %s.', $domain), 0, $exception);
}
if (empty($ips)) {
throw new FailureException(sprintf('Host for %s not found.', $domain));
}
foreach ($ips as $ip) {
try {
return yield from $this->connector->connect($ip, $port, $options);
} catch (TimeoutException $exception) {
// Connection timed out, try next IP address.
} catch (FailureException $exception) {
// Connection failed, try next IP address.
}
}
throw new FailureException(sprintf('Could not connect to %s:%d.', $domain, $port), 0, $exception);
}
/**
* {@inheritdoc}
*/
public function execute(string $name, $type, array $options = []) : \Generator
{
$timeout = isset($options['timeout']) ? (double) $options['timeout'] : self::DEFAULT_TIMEOUT;
$retries = isset($options['retries']) ? (int) $options['retries'] : self::DEFAULT_RETRIES;
if (0 > $retries) {
$retries = 0;
}
$question = $this->createQuestion($name, $type);
$request = $this->createRequest($question);
$data = $this->encoder->encode($request);
/** @var \Icicle\Socket\Socket $socket */
$socket = (yield from $this->connector->connect($this->address, $this->port, ['protocol' => self::PROTOCOL]));
try {
$attempt = 0;
do {
try {
yield from $socket->write($data);
$response = (yield from $socket->read(self::MAX_PACKET_SIZE, null, $timeout));
try {
$response = $this->decoder->decode($response);
} catch (\Exception $exception) {
throw new FailureException($exception);
// Wrap in more specific exception.
}
if (0 !== $response->getResponseCode()) {
throw new ResponseCodeException($response);
}
if ($response->getId() !== $request->getId()) {
throw new ResponseIdException($response);
}
return $response;
} catch (TimeoutException $exception) {
// Ignore timeout and try the request again.
}
} while (++$attempt <= $retries);
throw new NoResponseException('No response from server.');
} finally {
$socket->close();
}
}
