@Override
public HttpURLConnection connect(
final URI uri,
final String method,
final byte[] entity,
final Map<String, List<String>> headers)
throws HeliosException {
final Endpoint endpoint = endpointIterator.next();
// convert the URI whose hostname portion is a domain name into a URI where the host is an IP
// as we expect there to be several different IP addresses besides a common domain name
final URI ipUri;
try {
ipUri = toIpUri(endpoint, uri);
} catch (URISyntaxException e) {
throw new HeliosException(e);
}
try {
log.debug("connecting to {}", ipUri);
if (clientCertificatePath.isPresent()) {
// prioritize using the certificate file if set
return connectWithCertificateFile(ipUri, method, entity, headers);
} else if (agentProxy.isPresent() && !identities.isEmpty()) {
// ssh-agent based authentication
return connectWithIdentities(identities, ipUri, method, entity, headers);
} else {
// no authentication
return doConnect(ipUri, method, entity, headers);
}
} catch (ConnectException | SocketTimeoutException | UnknownHostException e) {
// UnknownHostException happens if we can't resolve hostname into IP address.
// UnknownHostException's getMessage method returns just the hostname which is a
// useless message, so log the exception class name to provide more info.
log.debug(e.toString());
throw new HeliosException("Unable to connect to master", e);
} catch (IOException e) {
throw new HeliosException(e);
}
}
