include/hbase/client/meta-utils.h

/*
 * 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.
 *
 */
#pragma once

#include <memory>
#include <string>

#include "hbase/connection/request.h"
#include "hbase/connection/response.h"
#include "hbase/client/region-location.h"
#include "HBase.pb.h"
#include "hbase/serde/table-name.h"

namespace hbase {

/**
 * @brief Utility for meta operations.
 */
class MetaUtil {
 public:
  static constexpr const char *kSystemNamespace = "hbase";
  static constexpr const char *kMetaTableQualifier = "meta";
  static constexpr const char *kMetaTableName = "hbase:meta";
  static constexpr const char *kMetaRegion = "1588230740";
  static constexpr const char *kMetaRegionName = "hbase:meta,,1";
  static constexpr const char *kCatalogFamily = "info";
  static constexpr const char *kRegionInfoColumn = "regioninfo";
  static constexpr const char *kServerColumn = "server";

  MetaUtil();

  /**
   * Given a table and a row give the row key from which to start a scan to find
   * region locations.
   */
  std::string RegionLookupRowkey(const hbase::pb::TableName &tn, const std::string &row) const;

  /**
   * Given a row we're trying to access create a request to look up the
   * location.
   */
  std::unique_ptr<Request> MetaRequest(const hbase::pb::TableName tn, const std::string &row) const;

  /**
   * Return a RegionLocation from the parsed Response
   */
  std::shared_ptr<RegionLocation> CreateLocation(const Response &resp,
                                                 const hbase::pb::TableName &tn);

  /**
   * Return whether the table is the meta table.
   */
  static bool IsMeta(const hbase::pb::TableName &tn);

  const pb::RegionInfo &meta_region_info() const { return meta_region_info_; }

 private:
  pb::RegionInfo meta_region_info_;
};
}  // namespace hbase