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/*
 * 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.client;

import java.io.IOException;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.BulkLoadHFileRequest;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.BulkLoadHFileResponse;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.CleanupBulkLoadRequest;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ClientService;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.PrepareBulkLoadRequest;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.PrepareBulkLoadResponse;
import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier;
import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.RegionSpecifierType;
import org.apache.hadoop.security.token.Token;

import static org.apache.hadoop.hbase.HConstants.PRIORITY_UNSET;

/**
 * Client proxy for SecureBulkLoadProtocol
 */
@InterfaceAudience.Private
public class SecureBulkLoadClient {
  private Table table;
  private final RpcControllerFactory rpcControllerFactory;

  public SecureBulkLoadClient(final Configuration conf, Table table) {
    this.table = table;
    this.rpcControllerFactory = new RpcControllerFactory(conf);
  }

  public String prepareBulkLoad(final Connection conn) throws IOException {
    try {
      ClientServiceCallable callable = new ClientServiceCallable(conn,
          table.getName(), HConstants.EMPTY_START_ROW,
          this.rpcControllerFactory.newController(), PRIORITY_UNSET) {
        @Override
        protected String rpcCall() throws Exception {
          byte[] regionName = getLocation().getRegionInfo().getRegionName();
          RegionSpecifier region =
              RequestConverter.buildRegionSpecifier(RegionSpecifierType.REGION_NAME, regionName);
          PrepareBulkLoadRequest request = PrepareBulkLoadRequest.newBuilder()
              .setTableName(ProtobufUtil.toProtoTableName(table.getName()))
              .setRegion(region).build();
          PrepareBulkLoadResponse response = getStub().prepareBulkLoad(null, request);
          return response.getBulkToken();
        }
      };
      return RpcRetryingCallerFactory.instantiate(conn.getConfiguration(), null)
          . newCaller().callWithRetries(callable, Integer.MAX_VALUE);
    } catch (Throwable throwable) {
      throw new IOException(throwable);
    }
  }

  public void cleanupBulkLoad(final Connection conn, final String bulkToken) throws IOException {
    try {
      ClientServiceCallable callable = new ClientServiceCallable(conn,
          table.getName(), HConstants.EMPTY_START_ROW, this.rpcControllerFactory.newController(), PRIORITY_UNSET) {
        @Override
        protected Void rpcCall() throws Exception {
          byte[] regionName = getLocation().getRegionInfo().getRegionName();
          RegionSpecifier region = RequestConverter.buildRegionSpecifier(
              RegionSpecifierType.REGION_NAME, regionName);
          CleanupBulkLoadRequest request =
              CleanupBulkLoadRequest.newBuilder().setRegion(region).setBulkToken(bulkToken).build();
          getStub().cleanupBulkLoad(null, request);
          return null;
        }
      };
      RpcRetryingCallerFactory.instantiate(conn.getConfiguration(), null)
          . newCaller().callWithRetries(callable, Integer.MAX_VALUE);
    } catch (Throwable throwable) {
      throw new IOException(throwable);
    }
  }

  /**
   * Securely bulk load a list of HFiles using client protocol.
   *
   * @param client
   * @param familyPaths
   * @param regionName
   * @param assignSeqNum
   * @param userToken
   * @param bulkToken
   * @return true if all are loaded
   * @throws IOException
   */
  public boolean secureBulkLoadHFiles(final ClientService.BlockingInterface client,
      final List> familyPaths,
      final byte[] regionName, boolean assignSeqNum,
      final Token userToken, final String bulkToken) throws IOException {
    return secureBulkLoadHFiles(client, familyPaths, regionName, assignSeqNum, userToken, bulkToken,
        false);
  }

  /**
   * Securely bulk load a list of HFiles using client protocol.
   *
   * @param client
   * @param familyPaths
   * @param regionName
   * @param assignSeqNum
   * @param userToken
   * @param bulkToken
   * @param copyFiles
   * @return true if all are loaded
   * @throws IOException
   */
  public boolean secureBulkLoadHFiles(final ClientService.BlockingInterface client,
      final List> familyPaths,
      final byte[] regionName, boolean assignSeqNum,
      final Token userToken, final String bulkToken, boolean copyFiles) throws IOException {
    BulkLoadHFileRequest request =
        RequestConverter.buildBulkLoadHFileRequest(familyPaths, regionName, assignSeqNum,
          userToken, bulkToken, copyFiles);

    try {
      BulkLoadHFileResponse response = client.bulkLoadHFile(null, request);
      return response.getLoaded();
    } catch (Exception se) {
      throw ProtobufUtil.handleRemoteException(se);
    }
  }
}