text: /**
   *    Copyright (C) 2016 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.
   */
  
  #define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
  
  #include "mongo/platform/basic.h"
  
  #include "mongo/bson/util/bson_extract.h"
  #include "mongo/db/auth/action_type.h"
  #include "mongo/db/auth/authorization_session.h"
  #include "mongo/db/auth/privilege.h"
  #include "mongo/db/commands.h"
  #include "mongo/db/namespace_string.h"
  #include "mongo/db/s/balancer/balancer.h"
  #include "mongo/s/request_types/balance_chunk_request_type.h"
  #include "mongo/util/log.h"
  #include "mongo/util/mongoutils/str.h"
  
  namespace mongo {
  namespace {
  
  using std::string;
  using str::stream;
  
  class ConfigSvrMoveChunkCommand : public BasicCommand {
  public:
      ConfigSvrMoveChunkCommand() : BasicCommand("_configsvrMoveChunk") {}
  
      std::string help() const override {
          return "Internal command, which is exported by the sharding config server. Do not call "
                 "directly. Requests the balancer to move or rebalance a single chunk.";
      }
  
      AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
          return AllowedOnSecondary::kNever;
      }
  
      bool adminOnly() const override {
          return true;
      }
  
      bool supportsWriteConcern(const BSONObj& cmd) const override {
          return true;
      }
  
      Status checkAuthForCommand(Client* client,
                                 const std::string& dbname,
                                 const BSONObj& cmdObj) const override {
          if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
                  ResourcePattern::forClusterResource(), ActionType::internal)) {
              return Status(ErrorCodes::Unauthorized, "Unauthorized");
          }
          return Status::OK();
      }
  
      bool run(OperationContext* opCtx,
               const std::string& unusedDbName,
               const BSONObj& cmdObj,
               BSONObjBuilder& result) override {
          auto request = uassertStatusOK(BalanceChunkRequest::parseFromConfigCommand(cmdObj));
  
          if (request.hasToShardId()) {
              uassertStatusOK(Balancer::get(opCtx)->moveSingleChunk(opCtx,
                                                                    request.getChunk(),
                                                                    request.getToShardId(),
                                                                    request.getMaxChunkSizeBytes(),
                                                                    request.getSecondaryThrottle(),
                                                                    request.getWaitForDelete()));
          } else {
              uassertStatusOK(Balancer::get(opCtx)->rebalanceSingleChunk(opCtx, request.getChunk()));
          }
  
          return true;
      }
  
  } configSvrMoveChunk;
  
  }  // namespace
  }  // namespace mongo
  