/**
    *
    * 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.hbase;
  
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Random;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.FileUtil;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.client.Get;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.client.Result;
  import org.apache.hadoop.hbase.client.Table;
  import org.apache.hadoop.hbase.http.ssl.KeyStoreTestUtil;
  import org.apache.hadoop.hbase.testclassification.LargeTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster;
  import org.apache.hadoop.hdfs.MiniDFSCluster;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  /**
   * Test our testing utility class
   */
  @Category(LargeTests.class)
  public class TestHBaseTestingUtility {
    private static final Log LOG = LogFactory.getLog(TestHBaseTestingUtility.class);
  
    /**
     * Basic sanity test that spins up multiple HDFS and HBase clusters that share
     * the same ZK ensemble. We then create the same table in both and make sure
     * that what we insert in one place doesn't end up in the other.
     * @throws Exception
     */
    @Test (timeout=180000)
    public void testMultiClusters() throws Exception {
      // Create three clusters
  
      // Cluster 1.
      HBaseTestingUtility htu1 = new HBaseTestingUtility();
      // Set a different zk path for each cluster
      htu1.getConfiguration().set(HConstants.ZOOKEEPER_ZNODE_PARENT, "/1");
      htu1.startMiniZKCluster();
  
      // Cluster 2
      HBaseTestingUtility htu2 = new HBaseTestingUtility();
      htu2.getConfiguration().set(HConstants.ZOOKEEPER_ZNODE_PARENT, "/2");
      htu2.getConfiguration().set(HConstants.ZOOKEEPER_CLIENT_PORT,
        htu1.getConfiguration().get(HConstants.ZOOKEEPER_CLIENT_PORT, "-1"));
      htu2.setZkCluster(htu1.getZkCluster());
  
      // Cluster 3; seed it with the conf from htu1 so we pickup the 'right'
      // zk cluster config; it is set back into the config. as part of the
      // start of minizkcluster.
      HBaseTestingUtility htu3 = new HBaseTestingUtility();
      htu3.getConfiguration().set(HConstants.ZOOKEEPER_ZNODE_PARENT, "/3");
      htu3.getConfiguration().set(HConstants.ZOOKEEPER_CLIENT_PORT,
        htu1.getConfiguration().get(HConstants.ZOOKEEPER_CLIENT_PORT, "-1"));
      htu3.setZkCluster(htu1.getZkCluster());
  
      try {
        htu1.startMiniCluster();
        htu2.startMiniCluster();
        htu3.startMiniCluster();
  
        final TableName TABLE_NAME = TableName.valueOf("test");
        final byte[] FAM_NAME = Bytes.toBytes("fam");
        final byte[] ROW = Bytes.toBytes("row");
        final byte[] QUAL_NAME = Bytes.toBytes("qual");
        final byte[] VALUE = Bytes.toBytes("value");
 
       Table table1 = htu1.createTable(TABLE_NAME, FAM_NAME);
       Table table2 = htu2.createTable(TABLE_NAME, FAM_NAME);
 
       Put put = new Put(ROW);
       put.add(FAM_NAME, QUAL_NAME, VALUE);
       table1.put(put);
 
       Get get = new Get(ROW);
       get.addColumn(FAM_NAME, QUAL_NAME);
       Result res = table1.get(get);
       assertEquals(1, res.size());
 
       res = table2.get(get);
       assertEquals(0, res.size());
 
       table1.close();
       table2.close();
 
     } finally {
       htu3.shutdownMiniCluster();
       htu2.shutdownMiniCluster();
       htu1.shutdownMiniCluster();
     }
   }
 
   @Test public void testMiniCluster() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
 
     MiniHBaseCluster cluster = hbt.startMiniCluster();
     try {
       assertEquals(1, cluster.getLiveRegionServerThreads().size());
     } finally {
       hbt.shutdownMiniCluster();
     }
   }
 
   @Test
   public void testMiniClusterBindToWildcard() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     hbt.getConfiguration().set("hbase.regionserver.ipc.address", "0.0.0.0");
     MiniHBaseCluster cluster = hbt.startMiniCluster();
     try {
       assertEquals(1, cluster.getLiveRegionServerThreads().size());
     } finally {
       hbt.shutdownMiniCluster();
     }
   }
 
   @Test
   public void testMiniClusterWithSSLOn() throws Exception {
     final String BASEDIR = System.getProperty("test.build.dir",
         "target/test-dir") + "/" + TestHBaseTestingUtility.class.getSimpleName();
     String sslConfDir = KeyStoreTestUtil.getClasspathDir(TestHBaseTestingUtility.class);
     String keystoresDir = new File(BASEDIR).getAbsolutePath();
 
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     File base = new File(BASEDIR);
     FileUtil.fullyDelete(base);
     base.mkdirs();
 
     KeyStoreTestUtil.setupSSLConfig(keystoresDir, sslConfDir, hbt.getConfiguration(), false);
 
     hbt.getConfiguration().set("hbase.ssl.enabled", "true");
     hbt.getConfiguration().addResource("ssl-server.xml");
     hbt.getConfiguration().addResource("ssl-client.xml");
 
     MiniHBaseCluster cluster = hbt.startMiniCluster();
     try {
       assertEquals(1, cluster.getLiveRegionServerThreads().size());
     } finally {
       hbt.shutdownMiniCluster();
     }
   }
 
   /**
    *  Test that we can start and stop multiple time a cluster
    *   with the same HBaseTestingUtility.
    */
   @Test public void testMultipleStartStop() throws Exception{
     HBaseTestingUtility htu1 = new HBaseTestingUtility();
     Path foo = new Path("foo");
 
     htu1.startMiniCluster();
     htu1.getDFSCluster().getFileSystem().create(foo);
     assertTrue( htu1.getDFSCluster().getFileSystem().exists(foo));
     htu1.shutdownMiniCluster();
 
     htu1.startMiniCluster();
     assertFalse( htu1.getDFSCluster().getFileSystem().exists(foo));
     htu1.getDFSCluster().getFileSystem().create(foo);
     assertTrue( htu1.getDFSCluster().getFileSystem().exists(foo));
     htu1.shutdownMiniCluster();
   }
 
   @Test
   public void testMiniZooKeeperWithOneServer() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     MiniZooKeeperCluster cluster1 = hbt.startMiniZKCluster();
     try {
       assertEquals(0, cluster1.getBackupZooKeeperServerNum());
       assertTrue((cluster1.killCurrentActiveZooKeeperServer() == -1));
     } finally {
       hbt.shutdownMiniZKCluster();
     }
   }
 
   @Test
   public void testMiniZooKeeperWithMultipleServers() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     // set up zookeeper cluster with 5 zk servers
     MiniZooKeeperCluster cluster2 = hbt.startMiniZKCluster(5);
     int defaultClientPort = 21818;
     cluster2.setDefaultClientPort(defaultClientPort);
     try {
       assertEquals(4, cluster2.getBackupZooKeeperServerNum());
 
       // killing the current active zk server
       int currentActivePort = cluster2.killCurrentActiveZooKeeperServer();
       assertTrue(currentActivePort >= defaultClientPort);
       // Check if the client port is returning a proper value
       assertTrue(cluster2.getClientPort() == currentActivePort);
 
       // kill another active zk server
       currentActivePort = cluster2.killCurrentActiveZooKeeperServer();
       assertTrue(currentActivePort >= defaultClientPort);
       assertTrue(cluster2.getClientPort() == currentActivePort);      
       assertEquals(2, cluster2.getBackupZooKeeperServerNum());
       assertEquals(3, cluster2.getZooKeeperServerNum());
 
       // killing the backup zk servers
       cluster2.killOneBackupZooKeeperServer();
       cluster2.killOneBackupZooKeeperServer();
       assertEquals(0, cluster2.getBackupZooKeeperServerNum());
       assertEquals(1, cluster2.getZooKeeperServerNum());
 
       // killing the last zk server
       currentActivePort = cluster2.killCurrentActiveZooKeeperServer();
       assertTrue(currentActivePort == -1);
       assertTrue(cluster2.getClientPort() == currentActivePort);
       // this should do nothing.
       cluster2.killOneBackupZooKeeperServer();
       assertEquals(-1, cluster2.getBackupZooKeeperServerNum());
       assertEquals(0, cluster2.getZooKeeperServerNum());
     } finally {
       hbt.shutdownMiniZKCluster();
     }
   }
 
   @Test
   public void testMiniZooKeeperWithMultipleClientPorts() throws Exception {
     int defaultClientPort = 8888;
     int i, j;
     HBaseTestingUtility hbt = new HBaseTestingUtility();
 
     // Test 1 - set up zookeeper cluster with same number of ZK servers and specified client ports
     int [] clientPortList1 = {1111, 1112, 1113};
     MiniZooKeeperCluster cluster1 = hbt.startMiniZKCluster(clientPortList1.length, clientPortList1);
     try {
       List<Integer> clientPortListInCluster = cluster1.getClientPortList();
 
       for (i = 0; i < clientPortListInCluster.size(); i++) {
         assertEquals(clientPortListInCluster.get(i).intValue(), clientPortList1[i]);
       }
     } finally {
       hbt.shutdownMiniZKCluster();
     }
 
     // Test 2 - set up zookeeper cluster with more ZK servers than specified client ports
     hbt.getConfiguration().setInt("test.hbase.zookeeper.property.clientPort", defaultClientPort);
     int [] clientPortList2 = {2222, 2223};
     MiniZooKeeperCluster cluster2 =
         hbt.startMiniZKCluster(clientPortList2.length + 2, clientPortList2);
 
     try {
       List<Integer> clientPortListInCluster = cluster2.getClientPortList();
 
       for (i = 0, j = 0; i < clientPortListInCluster.size(); i++) {
         if (i < clientPortList2.length) {
           assertEquals(clientPortListInCluster.get(i).intValue(), clientPortList2[i]);
         } else {
           // servers with no specified client port will use defaultClientPort or some other ports
           // based on defaultClientPort
           assertEquals(clientPortListInCluster.get(i).intValue(), defaultClientPort + j);
           j++;
         }
       }
     } finally {
       hbt.shutdownMiniZKCluster();
     }
 
     // Test 3 - set up zookeeper cluster with invalid client ports
     hbt.getConfiguration().setInt("test.hbase.zookeeper.property.clientPort", defaultClientPort);
     int [] clientPortList3 = {3333, -3334, 3335, 0};
     MiniZooKeeperCluster cluster3 =
         hbt.startMiniZKCluster(clientPortList3.length + 1, clientPortList3);
 
     try {
       List<Integer> clientPortListInCluster = cluster3.getClientPortList();
 
       for (i = 0, j = 0; i < clientPortListInCluster.size(); i++) {
         // Servers will only use valid client ports; if ports are not specified or invalid,
         // the default port or a port based on default port will be used.
         if (i < clientPortList3.length && clientPortList3[i] > 0) {
           assertEquals(clientPortListInCluster.get(i).intValue(), clientPortList3[i]);
         } else {
           assertEquals(clientPortListInCluster.get(i).intValue(), defaultClientPort + j);
           j++;
         }
       }
     } finally {
       hbt.shutdownMiniZKCluster();
     }
 
     // Test 4 - set up zookeeper cluster with default port and some other ports used
     // This test tests that the defaultClientPort and defaultClientPort+2 are used, so
     // the algorithm should choice defaultClientPort+1 and defaultClientPort+3 to fill
     // out the ports for servers without ports specified.
     hbt.getConfiguration().setInt("test.hbase.zookeeper.property.clientPort", defaultClientPort);
     int [] clientPortList4 = {-4444, defaultClientPort+2, 4446, defaultClientPort};
     MiniZooKeeperCluster cluster4 =
         hbt.startMiniZKCluster(clientPortList4.length + 1, clientPortList4);
 
     try {
       List<Integer> clientPortListInCluster = cluster4.getClientPortList();
 
       for (i = 0, j = 1; i < clientPortListInCluster.size(); i++) {
         // Servers will only use valid client ports; if ports are not specified or invalid,
         // the default port or a port based on default port will be used.
         if (i < clientPortList4.length && clientPortList4[i] > 0) {
           assertEquals(clientPortListInCluster.get(i).intValue(), clientPortList4[i]);
         } else {
           assertEquals(clientPortListInCluster.get(i).intValue(), defaultClientPort + j);
           j +=2;
         }
       }
     } finally {
       hbt.shutdownMiniZKCluster();
     }
 
     // Test 5 - set up zookeeper cluster with same ports specified - fail is expected.
     int [] clientPortList5 = {5555, 5556, 5556};
 
     try {
       MiniZooKeeperCluster cluster5 =
           hbt.startMiniZKCluster(clientPortList5.length, clientPortList5);
       assertTrue(cluster5.getClientPort() == -1); // expected failure
     } catch (Exception e) {
       // exception is acceptable
     } finally {
       hbt.shutdownMiniZKCluster();
     }
   }
 
   @Test public void testMiniDFSCluster() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     MiniDFSCluster cluster = hbt.startMiniDFSCluster(null);
     FileSystem dfs = cluster.getFileSystem();
     Path dir = new Path("dir");
     Path qualifiedDir = dfs.makeQualified(dir);
     LOG.info("dir=" + dir + ", qualifiedDir=" + qualifiedDir);
     assertFalse(dfs.exists(qualifiedDir));
     assertTrue(dfs.mkdirs(qualifiedDir));
     assertTrue(dfs.delete(qualifiedDir, true));
     hbt.shutdownMiniCluster();
   }
 
   @Test public void testSetupClusterTestBuildDir() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     Path testdir = hbt.getClusterTestDir();
     LOG.info("uuid-subdir=" + testdir);
     FileSystem fs = hbt.getTestFileSystem();
 
     assertFalse(fs.exists(testdir));
 
     hbt.startMiniDFSCluster(null);
     assertTrue(fs.exists(testdir));
 
     hbt.shutdownMiniCluster();
     assertFalse(fs.exists(testdir));
   }
 
   @Test public void testTestDir() throws Exception {
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     Path testdir = hbt.getDataTestDir();
     LOG.info("testdir=" + testdir);
     FileSystem fs = hbt.getTestFileSystem();
     assertTrue(!fs.exists(testdir));
     assertTrue(fs.mkdirs(testdir));
     assertTrue(hbt.cleanupTestDir());
   }
 
   @Test public void testMRYarnConfigsPopulation() throws IOException {
     Map<String, String> dummyProps = new HashMap<>();
     dummyProps.put("mapreduce.jobtracker.address", "dummyhost:11234");
     dummyProps.put("yarn.resourcemanager.address", "dummyhost:11235");
     dummyProps.put("mapreduce.jobhistory.address", "dummyhost:11236");
     dummyProps.put("yarn.resourcemanager.scheduler.address", "dummyhost:11237");
     dummyProps.put("mapreduce.jobhistory.webapp.address", "dummyhost:11238");
     dummyProps.put("yarn.resourcemanager.webapp.address", "dummyhost:11239");
   
     HBaseTestingUtility hbt = new HBaseTestingUtility();
     
     // populate the mr props to the Configuration instance
     for (Entry<String, String> entry : dummyProps.entrySet()) {
       hbt.getConfiguration().set(entry.getKey(), entry.getValue());
     }
     
     for (Entry<String,String> entry : dummyProps.entrySet()) {
       assertTrue("The Configuration for key " + entry.getKey() +" and value: " + entry.getValue() +
                  " is not populated correctly", hbt.getConfiguration().get(entry.getKey()).equals(entry.getValue()));
     }
 
     hbt.startMiniMapReduceCluster();
     
     // Confirm that MiniMapReduceCluster overwrites the mr properties and updates the Configuration 
     for (Entry<String,String> entry : dummyProps.entrySet()) {
       assertFalse("The MR prop: " + entry.getValue() + " is not overwritten when map reduce mini"+
                   "cluster is started", hbt.getConfiguration().get(entry.getKey()).equals(entry.getValue()));
     }
     
     hbt.shutdownMiniMapReduceCluster();
   }
 }