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/db/auth/action_set.h"
  #include "mongo/db/auth/action_type.h"
  #include "mongo/db/auth/authorization_session.h"
  #include "mongo/db/auth/privilege.h"
  #include "mongo/db/catalog_raii.h"
  #include "mongo/db/commands.h"
  #include "mongo/db/s/collection_sharding_runtime.h"
  #include "mongo/db/s/sharded_connection_info.h"
  #include "mongo/db/s/sharding_state.h"
  #include "mongo/s/grid.h"
  #include "mongo/util/log.h"
  #include "mongo/util/stringutils.h"
  
  namespace mongo {
  namespace {
  
  class GetShardVersion : public BasicCommand {
  public:
      GetShardVersion() : BasicCommand("getShardVersion") {}
  
      std::string help() const override {
          return " example: { getShardVersion : 'alleyinsider.foo'  } ";
      }
  
      bool supportsWriteConcern(const BSONObj& cmd) const override {
          return false;
      }
  
      AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
          return AllowedOnSecondary::kAlways;
      }
  
      bool adminOnly() const override {
          return true;
      }
  
      Status checkAuthForCommand(Client* client,
                                 const std::string& dbname,
                                 const BSONObj& cmdObj) const override {
          if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
                  ResourcePattern::forExactNamespace(NamespaceString(parseNs(dbname, cmdObj))),
                  ActionType::getShardVersion)) {
              return Status(ErrorCodes::Unauthorized, "Unauthorized");
          }
          return Status::OK();
      }
  
      std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const override {
          return CommandHelpers::parseNsFullyQualified(cmdObj);
      }
  
      bool run(OperationContext* opCtx,
               const std::string& dbname,
               const BSONObj& cmdObj,
               BSONObjBuilder& result) override {
          const NamespaceString nss(parseNs(dbname, cmdObj));
  
          ShardingState* const shardingState = ShardingState::get(opCtx);
          if (shardingState->enabled()) {
              result.append(
                  "configServer",
                  Grid::get(opCtx)->shardRegistry()->getConfigServerConnectionString().toString());
          } else {
              result.append("configServer", "");
          }
  
          ShardedConnectionInfo* const sci = ShardedConnectionInfo::get(opCtx->getClient(), false);
          result.appendBool("inShardedMode", sci != nullptr);
  
          if (sci && sci->getVersion(nss.ns())) {
              result.appendTimestamp("mine", sci->getVersion(nss.ns())->toLong());
          } else {
              result.appendTimestamp("mine", 0);
          }
  
          AutoGetCollection autoColl(opCtx, nss, MODE_IS);
          auto* const css = CollectionShardingRuntime::get(opCtx, nss);
  
          const auto metadata = css->getMetadata(opCtx);
          if (metadata->isSharded()) {
              result.appendTimestamp("global", metadata->getShardVersion().toLong());
          } else {
              result.appendTimestamp("global", ChunkVersion::UNSHARDED().toLong());
          }
  
          if (cmdObj["fullMetadata"].trueValue()) {
              BSONObjBuilder metadataBuilder(result.subobjStart("metadata"));
              if (metadata->isSharded()) {
                  metadata->toBSONBasic(metadataBuilder);
  
                  BSONArrayBuilder chunksArr(metadataBuilder.subarrayStart("chunks"));
                  metadata->toBSONChunks(chunksArr);
                  chunksArr.doneFast();
  
                  BSONArrayBuilder pendingArr(metadataBuilder.subarrayStart("pending"));
                  css->toBSONPending(pendingArr);
                  pendingArr.doneFast();
              }
              metadataBuilder.doneFast();
          }
  
          return true;
      }
  
  } getShardVersionCmd;
  
  }  // namespace
  }  // namespace mongo
  