/**
 * 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.HarFs;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.server.MiniYARNCluster;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;
import org.mockito.Mockito;

import java.io.IOException;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Random;

import static org.junit.Assert.*;
import static org.mockito.Mockito.*;

public class TestHadoopArchiveLogsRunner {

  private static final int FILE_SIZE_INCREMENT = 4096;
  private static final int[] FILE_SIZES = {3, 4, 2};
  private static final int FILE_COUNT = FILE_SIZES.length;
  private static final byte[] DUMMY_DATA = new byte[FILE_SIZE_INCREMENT];
  static {
    new Random().nextBytes(DUMMY_DATA);
  }

  private Configuration conf;
  private MiniDFSCluster dfsCluster;
  private MiniYARNCluster yarnCluster;
  private FileSystem fs;
  private ApplicationId app1;
  private Path app1Path;
  private Path workingDir;
  private Path remoteRootLogDir;
  private String suffix;

  @Rule
  public Timeout globalTimeout = new Timeout(50000);

  @Before
  public void setup() throws Exception {
    yarnCluster = new MiniYARNCluster(
        TestHadoopArchiveLogsRunner.class.getSimpleName(), 1, 2, 1, 1);
    conf = new YarnConfiguration();
    conf.setBoolean(YarnConfiguration.LOG_AGGREGATION_ENABLED, true);
    conf.setBoolean(YarnConfiguration.YARN_MINICLUSTER_FIXED_PORTS, true);
    yarnCluster.init(conf);
    yarnCluster.start();
    conf = yarnCluster.getConfig();
    dfsCluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
    conf = new JobConf(conf);

    app1 = ApplicationId.newInstance(System.currentTimeMillis(), 1);
    fs = FileSystem.get(conf);
    remoteRootLogDir = new Path(conf.get(
        YarnConfiguration.NM_REMOTE_APP_LOG_DIR,
        YarnConfiguration.DEFAULT_NM_REMOTE_APP_LOG_DIR));
    workingDir = new Path(remoteRootLogDir, "archive-logs-work");
    suffix = "logs";
    Path logDir = new Path(remoteRootLogDir,
        new Path(System.getProperty("user.name"), suffix));
    fs.mkdirs(logDir);
    app1Path = new Path(logDir, app1.toString());
    fs.mkdirs(app1Path);
    for (int i = 0; i < FILE_COUNT; i++) {
      createFile(fs, new Path(app1Path, "log" + (i + 1)), FILE_SIZES[i]);
    }
    FileStatus[] app1Files = fs.listStatus(app1Path);
    Assert.assertEquals(FILE_COUNT, app1Files.length);
  }

  @After
  public void teardown() throws IOException {
    if (fs != null) {
      fs.close();
    }
    if (yarnCluster != null) {
      yarnCluster.close();
    }
    if (dfsCluster != null) {
      dfsCluster.shutdown();
    }
  }

  @Test
  public void testHadoopArchiveLogs() throws Exception {
    String[] args = getArgs();
    final HadoopArchiveLogsRunner halr = new HadoopArchiveLogsRunner(conf);
    assertEquals(0, ToolRunner.run(halr, args));

    fs = FileSystem.get(conf);
    FileStatus[] app1Files = fs.listStatus(app1Path);
    Assert.assertEquals(1, app1Files.length);
    FileStatus harFile = app1Files[0];
    Assert.assertEquals(app1.toString() + ".har", harFile.getPath().getName());
    Path harPath = new Path("har:///" + harFile.getPath().toUri().getRawPath());
    FileStatus[] harLogs = HarFs.get(harPath.toUri(), conf).listStatus(harPath);
    Assert.assertEquals(FILE_COUNT, harLogs.length);
    Arrays.sort(harLogs, new Comparator<FileStatus>() {
      @Override
      public int compare(FileStatus o1, FileStatus o2) {
        return o1.getPath().getName().compareTo(o2.getPath().getName());
      }
    });
    for (int i = 0; i < FILE_COUNT; i++) {
      FileStatus harLog = harLogs[i];
      Assert.assertEquals("log" + (i + 1), harLog.getPath().getName());
      Assert.assertEquals(FILE_SIZES[i] * FILE_SIZE_INCREMENT, harLog.getLen());
      Assert.assertEquals(
          new FsPermission(FsAction.READ_WRITE, FsAction.READ, FsAction.NONE),
          harLog.getPermission());
      Assert.assertEquals(System.getProperty("user.name"),
          harLog.getOwner());
    }
    Assert.assertEquals(0, fs.listStatus(workingDir).length);
  }

  @Test
  public void testHadoopArchiveLogsWithArchiveError() throws Exception {
    String[] args = getArgs();
    final HadoopArchiveLogsRunner halr = new HadoopArchiveLogsRunner(conf);
    HadoopArchives mockHadoopArchives = mock(HadoopArchives.class);
    when(mockHadoopArchives.run(Mockito.<String[]>any())).thenReturn(-1);
    halr.hadoopArchives = mockHadoopArchives;
    assertNotEquals(0, ToolRunner.run(halr, args));

    // Make sure the original log files are intact
    FileStatus[] app1Files = fs.listStatus(app1Path);
    assertEquals(FILE_COUNT, app1Files.length);
    for (int i = 0; i < FILE_COUNT; i++) {
      Assert.assertEquals(FILE_SIZES[i] * FILE_SIZE_INCREMENT,
          app1Files[i].getLen());
    }
  }

  private String[] getArgs() {
    return new String[]{
        "-appId", app1.toString(),
        "-user", System.getProperty("user.name"),
        "-workingDir", workingDir.toString(),
        "-remoteRootLogDir", remoteRootLogDir.toString(),
        "-suffix", suffix};
  }

  private static void createFile(FileSystem fs, Path p, long sizeMultiple)
      throws IOException {
    FSDataOutputStream out = null;
    try {
      out = fs.create(p);
      for (int i = 0 ; i < sizeMultiple; i++) {
        out.write(DUMMY_DATA);
      }
    } finally {
      if (out != null) {
        out.close();
      }
    }
  }
}