blob: 7d392046fdf42c01f01b4528373b8afdef481c4b [file] [log] [blame]
/*
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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 org.apache.knox.gateway.topology.discovery.ambari;
import org.apache.knox.gateway.i18n.messages.MessagesFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class NameNodeUrlCreator implements ServiceURLCreator {
private static final String SERVICE = "NAMENODE";
private static final String NAMESERVICE_PARAM = "discovery-nameservice";
private AmbariServiceDiscoveryMessages log = MessagesFactory.get(AmbariServiceDiscoveryMessages.class);
private AmbariCluster cluster;
@Override
public void init(AmbariCluster cluster) {
this.cluster = cluster;
}
@Override
public String getTargetService() {
return SERVICE;
}
@Override
public List<String> create(String service, Map<String, String> serviceParams) {
List<String> urls = new ArrayList<>();
if (SERVICE.equals(service)) {
if (serviceParams != null && serviceParams.containsKey(NAMESERVICE_PARAM)) {
String declaredNameService = serviceParams.get(NAMESERVICE_PARAM);
// Validate declared nameservice against available nameservices
if (!validateDeclaredNameService(cluster, declaredNameService)) {
log.undefinedHDFSNameService(declaredNameService);
} else {
urls.add("hdfs://" + declaredNameService);
}
} else {
// Add the default nameservice URL to the result
AmbariCluster.ServiceConfiguration coreSite = cluster.getServiceConfiguration("HDFS", "core-site");
if (coreSite != null) {
String defaultFS = coreSite.getProperties().get("fs.defaultFS");
if (defaultFS != null) {
urls.add(defaultFS);
}
}
}
}
return urls;
}
// Verify whether the declared nameservice is among the configured nameservices in the cluster
private static boolean validateDeclaredNameService(AmbariCluster cluster, String declaredNameService) {
boolean isValid = false;
AmbariComponent nameNodeComp = cluster.getComponent(SERVICE);
if (nameNodeComp != null) {
String nameServices = nameNodeComp.getConfigProperty("dfs.nameservices");
if (nameServices != null && !nameServices.isEmpty()) {
// Parse the nameservices value
String[] namespaces = nameServices.split(",");
for (String ns : namespaces) {
if (ns.equals(declaredNameService)) {
isValid = true;
break;
}
}
}
}
return isValid;
}
}