com.datastax.oss.driver.internal.core.addresstranslation.FixedHostNameAddressTranslator Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.oss.driver.internal.core.addresstranslation;
import com.datastax.oss.driver.api.core.addresstranslation.AddressTranslator;
import com.datastax.oss.driver.api.core.config.DriverOption;
import com.datastax.oss.driver.api.core.context.DriverContext;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.net.InetSocketAddress;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This translator always returns same hostname, no matter what IP address a node has but still
* using its native transport port.
*
* The translator can be used for scenarios when all nodes are behind some kind of proxy, and it
* is not tailored for one concrete use case. One can use this, for example, for AWS PrivateLink as
* all nodes would be exposed to consumer - behind one hostname pointing to AWS Endpoint.
*/
public class FixedHostNameAddressTranslator implements AddressTranslator {
private static final Logger LOG = LoggerFactory.getLogger(FixedHostNameAddressTranslator.class);
public static final String ADDRESS_TRANSLATOR_ADVERTISED_HOSTNAME =
"advanced.address-translator.advertised-hostname";
public static DriverOption ADDRESS_TRANSLATOR_ADVERTISED_HOSTNAME_OPTION =
new DriverOption() {
@NonNull
@Override
public String getPath() {
return ADDRESS_TRANSLATOR_ADVERTISED_HOSTNAME;
}
};
private final String advertisedHostname;
private final String logPrefix;
public FixedHostNameAddressTranslator(@NonNull DriverContext context) {
logPrefix = context.getSessionName();
advertisedHostname =
context
.getConfig()
.getDefaultProfile()
.getString(ADDRESS_TRANSLATOR_ADVERTISED_HOSTNAME_OPTION);
}
@NonNull
@Override
public InetSocketAddress translate(@NonNull InetSocketAddress address) {
final int port = address.getPort();
LOG.debug("[{}] Resolved {}:{} to {}:{}", logPrefix, address, port, advertisedHostname, port);
return new InetSocketAddress(advertisedHostname, port);
}
@Override
public void close() {}
}