/**
 * 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.hdfs.server.namenode;

import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.fail;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.URI;
import java.security.Permission;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.Storage;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestClusterId {
  private static final Log LOG = LogFactory.getLog(TestClusterId.class);
  File hdfsDir;
  Configuration config;

  private String getClusterId(Configuration config) throws IOException {
    // see if cluster id not empty.
    Collection<URI> dirsToFormat = FSNamesystem.getNamespaceDirs(config);
    List<URI> editsToFormat = FSNamesystem.getNamespaceEditsDirs(config);
    FSImage fsImage = new FSImage(config, dirsToFormat, editsToFormat);
    
    Iterator<StorageDirectory> sdit = 
      fsImage.getStorage().dirIterator(NNStorage.NameNodeDirType.IMAGE);
    StorageDirectory sd = sdit.next();
    Properties props = Storage.readPropertiesFile(sd.getVersionFile());
    String cid = props.getProperty("clusterID");
    LOG.info("successfully formated : sd="+sd.getCurrentDir() + ";cid="+cid);
    return cid;
  }

  @Before
  public void setUp() throws IOException {
    System.setSecurityManager(new NoExitSecurityManager());

    String baseDir = System.getProperty("test.build.data", "build/test/data");

    hdfsDir = new File(baseDir, "dfs/name");
    if (hdfsDir.exists() && !FileUtil.fullyDelete(hdfsDir)) {
      throw new IOException("Could not delete test directory '" + hdfsDir + "'");
    }
    LOG.info("hdfsdir is " + hdfsDir.getAbsolutePath());

    // as some tests might change these values we reset them to defaults before
    // every test
    StartupOption.FORMAT.setForceFormat(false);
    StartupOption.FORMAT.setInteractiveFormat(true);
    
    config = new Configuration();
    config.set(DFS_NAMENODE_NAME_DIR_KEY, hdfsDir.getPath());
  }

  @After
  public void tearDown() throws IOException {
    System.setSecurityManager(null);

    if (hdfsDir.exists() && !FileUtil.fullyDelete(hdfsDir)) {
      throw new IOException("Could not tearDown test directory '" + hdfsDir
          + "'");
    }
  }

  @Test
  public void testFormatClusterIdOption() throws IOException {
    
    // 1. should format without cluster id
    //StartupOption.FORMAT.setClusterId("");
    NameNode.format(config);
    // see if cluster id not empty.
    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")) );

    // 2. successful format with given clusterid
    StartupOption.FORMAT.setClusterId("mycluster");
    NameNode.format(config);
    // see if cluster id matches with given clusterid.
    cid = getClusterId(config);
    assertTrue("ClusterId didn't match", cid.equals("mycluster"));

    // 3. format without any clusterid again. It should generate new
    //clusterid.
    StartupOption.FORMAT.setClusterId("");
    NameNode.format(config);
    String newCid = getClusterId(config);
    assertFalse("ClusterId should not be the same", newCid.equals(cid));
  }

  /**
   * Test namenode format with -format option. Format should succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormat() throws IOException {
    String[] argv = { "-format" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")));
  }

  /**
   * Test namenode format with -format option when an empty name directory
   * exists. Format should succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithEmptyDir() throws IOException {

    if (!hdfsDir.mkdirs()) {
      fail("Failed to create dir " + hdfsDir.getPath());
    }

    String[] argv = { "-format" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")));
  }

  /**
   * Test namenode format with -format -force options when name directory
   * exists. Format should succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithForce() throws IOException {

    if (!hdfsDir.mkdirs()) {
      fail("Failed to create dir " + hdfsDir.getPath());
    }

    String[] argv = { "-format", "-force" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")));
  }

  /**
   * Test namenode format with -format -force -clusterid option when name
   * directory exists. Format should succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithForceAndClusterId() throws IOException {

    if (!hdfsDir.mkdirs()) {
      fail("Failed to create dir " + hdfsDir.getPath());
    }

    String myId = "testFormatWithForceAndClusterId";
    String[] argv = { "-format", "-force", "-clusterid", myId };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    String cId = getClusterId(config);
    assertEquals("ClusterIds do not match", myId, cId);
  }

  /**
   * Test namenode format with -clusterid -force option. Format command should
   * fail as no cluster id was provided.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithInvalidClusterIdOption() throws IOException {

    String[] argv = { "-format", "-clusterid", "-force" };
    PrintStream origErr = System.err;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    PrintStream stdErr = new PrintStream(baos);
    System.setErr(stdErr);

    NameNode.createNameNode(argv, config);

    // Check if usage is printed
    assertTrue(baos.toString("UTF-8").contains("Usage: java NameNode"));
    System.setErr(origErr);

    // check if the version file does not exists.
    File version = new File(hdfsDir, "current/VERSION");
    assertFalse("Check version should not exist", version.exists());
  }

  /**
   * Test namenode format with -format -clusterid options. Format should fail
   * was no clusterid was sent.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithNoClusterIdOption() throws IOException {

    String[] argv = { "-format", "-clusterid" };
    PrintStream origErr = System.err;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    PrintStream stdErr = new PrintStream(baos);
    System.setErr(stdErr);

    NameNode.createNameNode(argv, config);

    // Check if usage is printed
    assertTrue(baos.toString("UTF-8").contains("Usage: java NameNode"));
    System.setErr(origErr);

    // check if the version file does not exists.
    File version = new File(hdfsDir, "current/VERSION");
    assertFalse("Check version should not exist", version.exists());
  }

  /**
   * Test namenode format with -format -clusterid and empty clusterid. Format
   * should fail as no valid if was provided.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithEmptyClusterIdOption() throws IOException {

    String[] argv = { "-format", "-clusterid", "" };

    PrintStream origErr = System.err;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    PrintStream stdErr = new PrintStream(baos);
    System.setErr(stdErr);

    NameNode.createNameNode(argv, config);

    // Check if usage is printed
    assertTrue(baos.toString("UTF-8").contains("Usage: java NameNode"));
    System.setErr(origErr);

    // check if the version file does not exists.
    File version = new File(hdfsDir, "current/VERSION");
    assertFalse("Check version should not exist", version.exists());
  }

  /**
   * Test namenode format with -format -nonInteractive options when a non empty
   * name directory exists. Format should not succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithNonInteractive() throws IOException {

    // we check for a non empty dir, so create a child path
    File data = new File(hdfsDir, "file");
    if (!data.mkdirs()) {
      fail("Failed to create dir " + data.getPath());
    }

    String[] argv = { "-format", "-nonInteractive" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have been aborted with exit code 1", 1,
          e.status);
    }

    // check if the version file does not exists.
    File version = new File(hdfsDir, "current/VERSION");
    assertFalse("Check version should not exist", version.exists());
  }

  /**
   * Test namenode format with -format -nonInteractive options when name
   * directory does not exist. Format should succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithNonInteractiveNameDirDoesNotExit()
      throws IOException {

    String[] argv = { "-format", "-nonInteractive" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")));
  }

  /**
   * Test namenode format with -force -nonInteractive -force option. Format
   * should succeed.
   * 
   * @throws IOException
   */
  @Test
  public void testFormatWithNonInteractiveAndForce() throws IOException {

    if (!hdfsDir.mkdirs()) {
      fail("Failed to create dir " + hdfsDir.getPath());
    }

    String[] argv = { "-format", "-nonInteractive", "-force" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")));
  }

  /**
   * Test namenode format with -format option when a non empty name directory
   * exists. Enter Y when prompted and the format should succeed.
   * 
   * @throws IOException
   * @throws InterruptedException
   */
  @Test
  public void testFormatWithoutForceEnterYes() throws IOException,
      InterruptedException {

    // we check for a non empty dir, so create a child path
    File data = new File(hdfsDir, "file");
    if (!data.mkdirs()) {
      fail("Failed to create dir " + data.getPath());
    }

    // capture the input stream
    InputStream origIn = System.in;
    ByteArrayInputStream bins = new ByteArrayInputStream("Y\n".getBytes());
    System.setIn(bins);

    String[] argv = { "-format" };

    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should have succeeded", 0, e.status);
    }

    System.setIn(origIn);

    String cid = getClusterId(config);
    assertTrue("Didn't get new ClusterId", (cid != null && !cid.equals("")));
  }

  /**
   * Test namenode format with -format option when a non empty name directory
   * exists. Enter N when prompted and format should be aborted.
   * 
   * @throws IOException
   * @throws InterruptedException
   */
  @Test
  public void testFormatWithoutForceEnterNo() throws IOException,
      InterruptedException {

    // we check for a non empty dir, so create a child path
    File data = new File(hdfsDir, "file");
    if (!data.mkdirs()) {
      fail("Failed to create dir " + data.getPath());
    }

    // capture the input stream
    InputStream origIn = System.in;
    ByteArrayInputStream bins = new ByteArrayInputStream("N\n".getBytes());
    System.setIn(bins);

    String[] argv = { "-format" };
    try {
      NameNode.createNameNode(argv, config);
      fail("createNameNode() did not call System.exit()");
    } catch (ExitException e) {
      assertEquals("Format should not have succeeded", 1, e.status);
    }

    System.setIn(origIn);

    // check if the version file does not exists.
    File version = new File(hdfsDir, "current/VERSION");
    assertFalse("Check version should not exist", version.exists());
  }

  private static class ExitException extends SecurityException {
    private static final long serialVersionUID = 1L;
    public final int status;

    public ExitException(int status) {
      super("There is no escape!");
      this.status = status;
    }
  }

  private static class NoExitSecurityManager extends SecurityManager {
    @Override
    public void checkPermission(Permission perm) {
      // allow anything.
    }

    @Override
    public void checkPermission(Permission perm, Object context) {
      // allow anything.
    }

    @Override
    public void checkExit(int status) {
      super.checkExit(status);
      throw new ExitException(status);
    }
  }
}