HADOOP-6944. [Herriot] Implement a functionality for getting proxy users

definitions like groups and hosts. Contributed by Vinay Thota.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1006356 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -282,6 +282,9 @@ Release 0.21.1 - Unreleased
 
     HADOOP-6993. Broken link on cluster setup page of docs. (eli)
 
+    HADOOP-6944. [Herriot] Implement a functionality for getting proxy users
+    definitions like groups and hosts. (Vinay Thota via cos)
+
 Release 0.21.0 - 2010-08-13
 
   INCOMPATIBLE CHANGES

src/test/system/java/org/apache/hadoop/test/system/AbstractDaemonCluster.java

@@ -27,8 +27,11 @@ import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Iterator;
 import java.util.Enumeration;
+import java.util.Arrays;
 import java.util.Hashtable;
+import java.net.URI;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
@@ -50,8 +53,6 @@ public abstract class AbstractDaemonCluster {
   private String newConfDir = null;  
   private static final  String CONF_HADOOP_LOCAL_DIR =
       "test.system.hdrc.hadoop.local.confdir"; 
-  private static final  String CONF_HADOOP_MULTI_USER_LIST =
-      "test.system.hdrc.multi-user.list.path";
   private final static Object waitLock = new Object();
   
   /**
@@ -302,27 +303,44 @@ public abstract class AbstractDaemonCluster {
   }
 
   /**
-   * Get the multi users list.
-   * @return ArrayList - users list as a array list.
-   * @throws IOException - if an I/O error occurs.
+   * Get the proxy user definitions from cluster from configuration.
+   * @return ProxyUserDefinitions - proxy users data like groups and hosts.
+   * @throws Exception - if no proxy users found in config.
    */
-  public ArrayList<String> getHadoopMultiUsersList() throws
-     IOException {
-    String hadoopUserListPath = conf.get(CONF_HADOOP_MULTI_USER_LIST);
-    if (hadoopUserListPath == null || hadoopUserListPath.isEmpty()) {
-      LOG.error("Proxy user list path has not been passed for "
-          + CONF_HADOOP_MULTI_USER_LIST);
-      throw new IllegalArgumentException(
-          "Proxy user list hasn't been provided.");
+  public ProxyUserDefinitions getHadoopProxyUsers() throws
+     Exception {
+    Iterator itr = conf.iterator();
+    ArrayList<String> proxyUsers = new ArrayList<String>();
+    while (itr.hasNext()) {
+      if (itr.next().toString().indexOf("hadoop.proxyuser") >= 0 &&
+          itr.next().toString().indexOf("groups=") >= 0) {
+         proxyUsers.add(itr.next().toString().split("\\.")[2]);
+      }
     }
-    File fileObj = new File(hadoopUserListPath);
-    DataInputStream disObj = new DataInputStream(new FileInputStream(fileObj));
-    ArrayList<String> usersList = new ArrayList<String>();
-    String strLine = null;
-    while((strLine = disObj.readLine()) != null){
-      usersList.add(strLine.substring(0,strLine.indexOf(',')));
+    if (proxyUsers.size() == 0) {
+       LOG.error("No proxy users found in the configuration.");
+       throw new Exception("No proxy users found in the configuration.");
     }
-    return usersList;
+
+    ProxyUserDefinitions pud = new ProxyUserDefinitions() {
+      @Override
+      public boolean writeToFile(URI filePath) throws IOException {
+        throw new UnsupportedOperationException("No such method exists.");
+      };
+    };
+
+    for (String userName : proxyUsers) {
+       List<String> groups = Arrays.asList(conf.get("hadoop.proxyuser." +
+           userName + ".groups").split("//,"));
+       List<String> hosts = Arrays.asList(conf.get("hadoop.proxyuser." +
+           userName + ".hosts").split("//,"));
+       ProxyUserDefinitions.GroupsAndHost definitions =
+           pud.new GroupsAndHost();
+       definitions.setGroups(groups);
+       definitions.setHosts(hosts);
+       pud.addProxyUser(userName, definitions);
+    }
+    return pud;
   }
   
   /**

src/test/system/java/org/apache/hadoop/test/system/ProxyUserDefinitions.java

@@ -0,0 +1,90 @@
+/**
+ * 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.test.system;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.io.IOException;
+import java.net.URI;
+
+/**
+ *  Its the data container which contains host names and
+ *  groups against each proxy user.
+ */
+public abstract class ProxyUserDefinitions {
+
+  /**
+   *  Groups and host names container
+   */
+  public class GroupsAndHost {
+    private List<String> groups;
+    private List<String> hosts;
+    public List<String> getGroups() {
+      return groups;
+    }
+    public void setGroups(List<String> groups) {
+      this.groups = groups;
+    }
+    public List<String> getHosts() {
+      return hosts;
+    }
+    public void setHosts(List<String> hosts) {
+      this.hosts = hosts;
+    }
+  }
+
+  protected Map<String, GroupsAndHost> proxyUsers;
+  protected ProxyUserDefinitions () {
+    proxyUsers = new HashMap<String, GroupsAndHost>();
+  }
+
+  /**
+   * Add proxy user data to a container.
+   * @param userName - proxy user name.
+   * @param definitions - groups and host names.
+   */
+  public void addProxyUser (String userName, GroupsAndHost definitions) {
+    proxyUsers.put(userName, definitions);
+  }
+
+  /**
+   * Get the host names and groups against given proxy user.
+   * @return - GroupsAndHost object.
+   */
+  public GroupsAndHost getProxyUser (String userName) {
+    return proxyUsers.get(userName);
+  }
+
+  /**
+   * Get the Proxy users data which contains the host names
+   * and groups against each user.
+   * @return - the proxy users data as hash map.
+   */
+  public Map<String, GroupsAndHost> getProxyUsers () {
+    return proxyUsers;
+  }
+
+  /**
+   * The implementation of this method has to be provided by a child of the class
+   * @param filePath
+   * @return
+   * @throws IOException
+   */
+  public abstract boolean writeToFile(URI filePath) throws IOException;
+}