| /** |
| * 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 org.apache.hadoop.tools; |
| |
| import java.io.IOException; |
| import java.io.PrintStream; |
| import java.net.InetSocketAddress; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.conf.Configured; |
| import org.apache.hadoop.ipc.RPC; |
| import org.apache.hadoop.net.NetUtils; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.apache.hadoop.util.Tool; |
| |
| /** |
| * Base class for the HDFS and MR implementations of tools which fetch and |
| * display the groups that users belong to. |
| */ |
| public abstract class GetGroupsBase extends Configured implements Tool { |
| |
| private PrintStream out; |
| |
| /** |
| * Create an instance of this tool using the given configuration. |
| * @param conf configuration. |
| */ |
| protected GetGroupsBase(Configuration conf) { |
| this(conf, System.out); |
| } |
| |
| /** |
| * Used exclusively for testing. |
| * |
| * @param conf The configuration to use. |
| * @param out The PrintStream to write to, instead of System.out |
| */ |
| protected GetGroupsBase(Configuration conf, PrintStream out) { |
| super(conf); |
| this.out = out; |
| } |
| |
| /** |
| * Get the groups for the users given and print formatted output to the |
| * {@link PrintStream} configured earlier. |
| */ |
| @Override |
| public int run(String[] args) throws Exception { |
| if (args.length == 0) { |
| args = new String[] { UserGroupInformation.getCurrentUser().getUserName() }; |
| } |
| |
| for (String username : args) { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(username + " :"); |
| for (String group : getUgmProtocol().getGroupsForUser(username)) { |
| sb.append(" ") |
| .append(group); |
| } |
| out.println(sb); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Must be overridden by subclasses to get the address where the |
| * {@link GetUserMappingsProtocol} implementation is running. |
| * |
| * @param conf The configuration to use. |
| * @return The address where the service is listening. |
| * @throws IOException raised on errors performing I/O. |
| */ |
| protected abstract InetSocketAddress getProtocolAddress(Configuration conf) |
| throws IOException; |
| |
| /** |
| * Get a client of the {@link GetUserMappingsProtocol}. |
| * @return A {@link GetUserMappingsProtocol} client proxy. |
| * @throws IOException raised on errors performing I/O. |
| */ |
| protected GetUserMappingsProtocol getUgmProtocol() throws IOException { |
| GetUserMappingsProtocol userGroupMappingProtocol = |
| RPC.getProxy(GetUserMappingsProtocol.class, |
| GetUserMappingsProtocol.versionID, |
| getProtocolAddress(getConf()), UserGroupInformation.getCurrentUser(), |
| getConf(), NetUtils.getSocketFactory(getConf(), |
| GetUserMappingsProtocol.class)); |
| return userGroupMappingProtocol; |
| } |
| |
| } |