text: /**
   *    Copyright (C) 2018-present MongoDB, Inc.
   *
   *    This program is free software: you can redistribute it and/or modify
   *    it under the terms of the Server Side Public License, version 1,
   *    as published by MongoDB, Inc.
   *
   *    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
   *    Server Side Public License for more details.
   *
   *    You should have received a copy of the Server Side Public License
   *    along with this program. If not, see
   *    <http://www.mongodb.com/licensing/server-side-public-license>.
   *
   *    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 Server Side 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.
   */
  
  #include "mongo/platform/basic.h"
  
  #include "mongo/bson/bsonobjbuilder.h"
  #include "mongo/transport/message_compressor_registry.h"
  
  namespace mongo {
  namespace {
  const auto kBytesIn = "bytesIn"_sd;
  const auto kBytesOut = "bytesOut"_sd;
  }  // namespace
  
  void appendMessageCompressionStats(BSONObjBuilder* b) {
      auto& registry = MessageCompressorRegistry::get();
      const auto& names = registry.getCompressorNames();
      if (names.empty()) {
          return;
      }
      BSONObjBuilder compressionSection(b->subobjStart("compression"));
  
      for (auto&& name : names) {
          auto&& compressor = registry.getCompressor(name);
          BSONObjBuilder base(compressionSection.subobjStart(name));
  
          BSONObjBuilder compressorSection(base.subobjStart("compressor"));
          compressorSection << kBytesIn << compressor->getCompressorBytesIn() << kBytesOut
                            << compressor->getCompressorBytesOut();
          compressorSection.doneFast();
  
          BSONObjBuilder decompressorSection(base.subobjStart("decompressor"));
          decompressorSection << kBytesIn << compressor->getDecompressorBytesIn() << kBytesOut
                              << compressor->getDecompressorBytesOut();
          decompressorSection.doneFast();
          base.doneFast();
      }
      compressionSection.doneFast();
  }
  
  }  // namespace mongo
  