/*
    * 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.coprocessor;
  
  import org.apache.hadoop.hbase.client.Table;
  import org.apache.hadoop.hbase.util.ByteStringer;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.HConstants;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.ipc.BlockingRpcCallback;
  import org.apache.hadoop.hbase.ipc.CoprocessorRpcChannel;
  import org.apache.hadoop.hbase.ipc.ServerRpcController;
  import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
  import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
  import org.apache.hadoop.hbase.protobuf.generated.SecureBulkLoadProtos;
  import org.apache.hadoop.hbase.security.SecureBulkLoadUtil;
  import org.apache.hadoop.hbase.util.Pair;
  import org.apache.hadoop.security.token.Token;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Client proxy for SecureBulkLoadProtocol
   * used in conjunction with SecureBulkLoadEndpoint
   */
  @InterfaceAudience.Private
  public class SecureBulkLoadClient {
    private Table table;
  
    public SecureBulkLoadClient(Table table) {
      this.table = table;
    }
  
    public String prepareBulkLoad(final TableName tableName) throws IOException {
      try {
        CoprocessorRpcChannel channel = table.coprocessorService(HConstants.EMPTY_START_ROW);
        SecureBulkLoadProtos.SecureBulkLoadService instance =
            ProtobufUtil.newServiceStub(SecureBulkLoadProtos.SecureBulkLoadService.class, channel);
  
        ServerRpcController controller = new ServerRpcController();
  
        BlockingRpcCallback<SecureBulkLoadProtos.PrepareBulkLoadResponse> rpcCallback =
            new BlockingRpcCallback<SecureBulkLoadProtos.PrepareBulkLoadResponse>();
  
        SecureBulkLoadProtos.PrepareBulkLoadRequest request =
            SecureBulkLoadProtos.PrepareBulkLoadRequest.newBuilder()
            .setTableName(ProtobufUtil.toProtoTableName(tableName)).build();
  
        instance.prepareBulkLoad(controller,
            request,
            rpcCallback);
  
        SecureBulkLoadProtos.PrepareBulkLoadResponse response = rpcCallback.get();
        if (controller.failedOnException()) {
          throw controller.getFailedOn();
        }
  
        return response.getBulkToken();
      } catch (Throwable throwable) {
        throw new IOException(throwable);
      }
    }
  
    public void cleanupBulkLoad(final String bulkToken) throws IOException {
      try {
        CoprocessorRpcChannel channel = table.coprocessorService(HConstants.EMPTY_START_ROW);
        SecureBulkLoadProtos.SecureBulkLoadService instance =
            ProtobufUtil.newServiceStub(SecureBulkLoadProtos.SecureBulkLoadService.class, channel);
  
        ServerRpcController controller = new ServerRpcController();
  
        BlockingRpcCallback<SecureBulkLoadProtos.CleanupBulkLoadResponse> rpcCallback =
            new BlockingRpcCallback<SecureBulkLoadProtos.CleanupBulkLoadResponse>();
  
        SecureBulkLoadProtos.CleanupBulkLoadRequest request =
            SecureBulkLoadProtos.CleanupBulkLoadRequest.newBuilder()
               .setBulkToken(bulkToken).build();
 
       instance.cleanupBulkLoad(controller,
           request,
           rpcCallback);
 
       if (controller.failedOnException()) {
         throw controller.getFailedOn();
       }
     } catch (Throwable throwable) {
       throw new IOException(throwable);
     }
   }
 
   public boolean bulkLoadHFiles(final List<Pair<byte[], String>> familyPaths,
                          final Token<?> userToken,
                          final String bulkToken,
                          final byte[] startRow) throws IOException {
     // we never want to send a batch of HFiles to all regions, thus cannot call
     // HTable#coprocessorService methods that take start and end rowkeys; see HBASE-9639
     try {
       CoprocessorRpcChannel channel = table.coprocessorService(startRow);
       SecureBulkLoadProtos.SecureBulkLoadService instance =
           ProtobufUtil.newServiceStub(SecureBulkLoadProtos.SecureBulkLoadService.class, channel);
 
       SecureBulkLoadProtos.DelegationToken protoDT =
           SecureBulkLoadProtos.DelegationToken.newBuilder().build();
       if(userToken != null) {
         protoDT =
             SecureBulkLoadProtos.DelegationToken.newBuilder()
               .setIdentifier(ByteStringer.wrap(userToken.getIdentifier()))
               .setPassword(ByteStringer.wrap(userToken.getPassword()))
               .setKind(userToken.getKind().toString())
               .setService(userToken.getService().toString()).build();
       }
 
       List<ClientProtos.BulkLoadHFileRequest.FamilyPath> protoFamilyPaths =
           new ArrayList<ClientProtos.BulkLoadHFileRequest.FamilyPath>();
       for(Pair<byte[], String> el: familyPaths) {
         protoFamilyPaths.add(ClientProtos.BulkLoadHFileRequest.FamilyPath.newBuilder()
           .setFamily(ByteStringer.wrap(el.getFirst()))
           .setPath(el.getSecond()).build());
       }
 
       SecureBulkLoadProtos.SecureBulkLoadHFilesRequest request =
           SecureBulkLoadProtos.SecureBulkLoadHFilesRequest.newBuilder()
             .setFsToken(protoDT)
             .addAllFamilyPath(protoFamilyPaths)
             .setBulkToken(bulkToken).build();
 
       ServerRpcController controller = new ServerRpcController();
       BlockingRpcCallback<SecureBulkLoadProtos.SecureBulkLoadHFilesResponse> rpcCallback =
           new BlockingRpcCallback<SecureBulkLoadProtos.SecureBulkLoadHFilesResponse>();
       instance.secureBulkLoadHFiles(controller,
         request,
         rpcCallback);
 
       SecureBulkLoadProtos.SecureBulkLoadHFilesResponse response = rpcCallback.get();
       if (controller.failedOnException()) {
         throw controller.getFailedOn();
       }
       return response.getLoaded();
     } catch (Throwable throwable) {
       throw new IOException(throwable);
     }
   }
 
   public Path getStagingPath(String bulkToken, byte[] family) throws IOException {
     return SecureBulkLoadUtil.getStagingPath(table.getConfiguration(), bulkToken, family);
   }
 }