/**
 * 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.coprocessor;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.util.Methods;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.security.token.Token;

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

public class SecureBulkLoadClient {
  private static Class protocolClazz;
  private static Class endpointClazz;
  private Object proxy;
  private HTable table;

  public SecureBulkLoadClient(HTable table) throws IOException {
    this(table, HConstants.EMPTY_START_ROW);
  }

  public SecureBulkLoadClient(HTable table, byte[] startRow) throws IOException {
    try {
      protocolClazz = protocolClazz!=null?protocolClazz:
          Class.forName("org.apache.hadoop.hbase.security.access.SecureBulkLoadProtocol");
      endpointClazz = endpointClazz!=null?endpointClazz:
          Class.forName("org.apache.hadoop.hbase.security.access.SecureBulkLoadEndpoint");
      proxy = table.coprocessorProxy(protocolClazz, startRow);
      this.table = table;
    } catch (ClassNotFoundException e) {
      throw new IOException("Failed to initialize SecureBulkLoad", e);
    }
  }

  public String prepareBulkLoad(byte[] tableName) throws IOException {
    try {
      String bulkToken = (String) Methods.call(protocolClazz, proxy,
          "prepareBulkLoad", new Class[]{byte[].class}, new Object[]{tableName});
      return bulkToken;
    } catch (Exception e) {
      throw new IOException("Failed to prepareBulkLoad", e);
    }
  }

  public void cleanupBulkLoad(String bulkToken) throws IOException {
    try {
      Methods.call(protocolClazz, proxy,
          "cleanupBulkLoad", new Class[]{String.class},new Object[]{bulkToken});
    } catch (Exception e) {
      throw new IOException("Failed to prepareBulkLoad", e);
    }
  }

  public boolean bulkLoadHFiles(List<Pair<byte[], String>> familyPaths,
                         Token<?> userToken, String bulkToken) throws IOException {
    try {
      return (Boolean)Methods.call(protocolClazz, proxy, "bulkLoadHFiles",
          new Class[]{List.class, Token.class, String.class},new Object[]{familyPaths, userToken, bulkToken});
    } catch (Exception e) {
      throw new IOException("Failed to bulkLoadHFiles", e);
    }
  }

  public Path getStagingPath(String bulkToken, byte[] family) throws IOException {
    try {
      return (Path)Methods.call(endpointClazz, null, "getStagingPath",
          new Class[]{Configuration.class, String.class, byte[].class},
          new Object[]{table.getConfiguration(), bulkToken, family});
    } catch (Exception e) {
      throw new IOException("Failed to getStagingPath", e);
    }
  }
}