/**
 * 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.StripedFileTestUtil;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.io.IOUtils;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.Rule;
import org.junit.rules.Timeout;

import java.io.IOException;

/**
 * Make sure we correctly update the quota usage with the striped blocks.
 */
public class TestQuotaWithStripedBlocks {
  private static final int BLOCK_SIZE = 1024 * 1024;
  private static final long DISK_QUOTA = BLOCK_SIZE * 10;
  private final ErasureCodingPolicy ecPolicy =
      StripedFileTestUtil.getDefaultECPolicy();
  private final int dataBlocks = ecPolicy.getNumDataUnits();
  private final int parityBlocsk = ecPolicy.getNumParityUnits();
  private final int groupSize = dataBlocks + parityBlocsk;
  private final int cellSize = ecPolicy.getCellSize();
  private static final Path ecDir = new Path("/ec");

  private MiniDFSCluster cluster;
  private FSDirectory dir;
  private DistributedFileSystem dfs;

  @Rule
  public Timeout globalTimeout = new Timeout(300000);

  @Before
  public void setUp() throws IOException {
    final Configuration conf = new Configuration();
    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
    conf.set(DFSConfigKeys.DFS_NAMENODE_EC_POLICIES_ENABLED_KEY,
        ecPolicy.getName());
    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(groupSize).build();
    cluster.waitActive();

    dir = cluster.getNamesystem().getFSDirectory();
    dfs = cluster.getFileSystem();

    dfs.mkdirs(ecDir);
    dfs.getClient()
        .setErasureCodingPolicy(ecDir.toString(), ecPolicy.getName());
    dfs.setQuota(ecDir, Long.MAX_VALUE - 1, DISK_QUOTA);
    dfs.setQuotaByStorageType(ecDir, StorageType.DISK, DISK_QUOTA);
    dfs.setStoragePolicy(ecDir, HdfsConstants.HOT_STORAGE_POLICY_NAME);
  }

  @After
  public void tearDown() {
    if (cluster != null) {
      cluster.shutdown();
      cluster = null;
    }
  }

  @Test
  public void testUpdatingQuotaCount() throws Exception {
    final Path file = new Path(ecDir, "file");
    FSDataOutputStream out = null;

    try {
      out = dfs.create(file, (short) 1);

      INodeFile fileNode = dir.getINode4Write(file.toString()).asFile();
      ExtendedBlock previous = null;
      // Create striped blocks which have a cell in each block.
      Block newBlock = DFSTestUtil.addBlockToFile(true, cluster.getDataNodes(),
          dfs, cluster.getNamesystem(), file.toString(), fileNode,
          dfs.getClient().getClientName(), previous, 1, 0);
      previous = new ExtendedBlock(cluster.getNamesystem().getBlockPoolId(),
          newBlock);

      final INodeDirectory dirNode = dir.getINode4Write(ecDir.toString())
          .asDirectory();
      final long spaceUsed = dirNode.getDirectoryWithQuotaFeature()
          .getSpaceConsumed().getStorageSpace();
      final long diskUsed = dirNode.getDirectoryWithQuotaFeature()
          .getSpaceConsumed().getTypeSpaces().get(StorageType.DISK);
      // When we add a new block we update the quota using the full block size.
      Assert.assertEquals(BLOCK_SIZE * groupSize, spaceUsed);
      Assert.assertEquals(BLOCK_SIZE * groupSize, diskUsed);

      dfs.getClient().getNamenode().complete(file.toString(),
          dfs.getClient().getClientName(), previous, fileNode.getId());

      final long actualSpaceUsed = dirNode.getDirectoryWithQuotaFeature()
          .getSpaceConsumed().getStorageSpace();
      final long actualDiskUsed = dirNode.getDirectoryWithQuotaFeature()
          .getSpaceConsumed().getTypeSpaces().get(StorageType.DISK);
      // In this case the file's real size is cell size * block group size.
      Assert.assertEquals(cellSize * groupSize,
          actualSpaceUsed);
      Assert.assertEquals(cellSize * groupSize,
          actualDiskUsed);
    } finally {
      IOUtils.cleanup(null, out);
    }
  }
}
