text: /**
   * Copyright (C) 2017 MongoDB Inc.
   *
   * This program is free software: you can redistribute it and/or  modify
   * it under the terms of the GNU Affero General Public License, version 3,
   * as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   * As a special exception, the copyright holders give permission to link the
   * code of portions of this program with the OpenSSL library under certain
   * conditions as described in each individual source file and distribute
   * linked combinations including the program with the OpenSSL library. You
   * must comply with the GNU Affero General Public License in all respects
   * for all of the code used other than as permitted herein. If you modify
   * file(s) with this exception, you may extend this exception to your
   * version of the file(s), but you are not obligated to do so. If you do not
   * wish to do so, delete this exception statement from your version. If you
   * delete this exception statement from all source files in the program,
   * then also delete it in the license file.
   */
  
  #pragma once
  
  #include <cstdint>
  
  namespace mongo {
  /**
   * Controls the maximum BSON depth tolerated by the server.
   */
  struct BSONDepth {
      // The default BSON depth nesting limit.
      static constexpr std::int32_t kDefaultMaxAllowableDepth = 200;
  
      // The minimum allowable value for the BSON depth parameter.
      static constexpr std::int32_t kBSONDepthParameterFloor = 5;
  
      // The maximum allowable value for the BSON depth parameter.
      static constexpr std::int32_t kBSONDepthParameterCeiling = 1000;
  
      // The number of extra levels of nesting above the storage depth limit that the server will
      // tolerate.
      static constexpr std::uint32_t kExtraSystemDepthLevels = 20;
  
      // The depth of BSON accepted by the server. Configurable via the 'maxBSONDepth' server
      // parameter.
      static std::int32_t maxAllowableDepth;
  
      /**
       * Returns the maximum allowable BSON depth as an unsigned integer. Note that this is a hard
       * limit -- any BSON document that exceeds this limit should be considered invalid.
       */
      static std::uint32_t getMaxAllowableDepth();
  
      /**
       * Returns the BSON nesting depth limit for stored objects. User documents that exceed this
       * depth are not valid for storage. This limit is slightly lower than the hard limit in
       * getMaxAllowableDepth(), since we may generate things like oplog entries from these documents
       * that contain extra levels of nesting.
       */
      static std::uint32_t getMaxDepthForUserStorage();
  };
  }  // namespace mongo
  