text: /**
   *    Copyright (C) 2015 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::kCommand
  
  #include "mongo/platform/basic.h"
  
  #include <string>
  
  #include "mongo/db/auth/action_type.h"
  #include "mongo/db/auth/authorization_session.h"
  #include "mongo/db/client.h"
  #include "mongo/db/commands.h"
  #include "mongo/db/commands/fsync.h"
  #include "mongo/db/curop.h"
  #include "mongo/db/dbmessage.h"
  #include "mongo/db/jsobj.h"
  #include "mongo/db/matcher/matcher.h"
  #include "mongo/db/namespace_string.h"
  #include "mongo/db/operation_context.h"
  #include "mongo/db/stats/fill_locker_info.h"
  #include "mongo/util/log.h"
  
  namespace mongo {
  
      class CurrentOpCommand : public Command {
      public:
  
          CurrentOpCommand() : Command("currentOp") {}
  
          bool isWriteCommandForConfigServer() const final { return false; }
  
          bool slaveOk() const final { return true; }
  
          bool adminOnly() const final { return true; }
  
          Status checkAuthForCommand(ClientBasic* client,
                                     const std::string& dbname,
                                     const BSONObj& cmdObj) final {
  
              bool isAuthorized = AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
                                      ResourcePattern::forClusterResource(),
                                      ActionType::inprog);
              return isAuthorized ? Status::OK() : Status(ErrorCodes::Unauthorized, "Unauthorized");
          }
  
          bool run(OperationContext* txn,
                   const std::string& db,
                   BSONObj& cmdObj,
                   int options,
                   std::string& errmsg,
                   BSONObjBuilder& result) final {
  
              const bool includeAll = cmdObj["$all"].trueValue();
  
              // Filter the output
              BSONObj filter;
              {
                  BSONObjBuilder b;
                  BSONObjIterator i(cmdObj);
                  invariant(i.more());
                  i.next(); // skip {currentOp: 1} which is required to be the first element
                  while (i.more()) {
                      BSONElement e = i.next();
                      if (str::equals("$all", e.fieldName())) {
                          continue;
                      }
  
                      b.append(e);
                  }
                  filter = b.obj();
              }
  
              const WhereCallbackReal whereCallback(txn, db);
              const Matcher matcher(filter, whereCallback);
  
              BSONArrayBuilder inprogBuilder(result.subarrayStart("inprog"));
  
              for (ServiceContext::LockedClientsCursor cursor(txn->getClient()->getServiceContext());
                   Client* client = cursor.next();) {
  
                  invariant(client);
  
                  stdx::lock_guard<Client> lk(*client);
                  const OperationContext* opCtx = client->getOperationContext();
  
                  if (!includeAll) {
                      // Skip over inactive connections.
                      if (!opCtx)
                          continue;
                  }
  
                  BSONObjBuilder infoBuilder;
  
                  // The client information
                  client->reportState(infoBuilder);
  
                  // Operation context specific information
                  infoBuilder.appendBool("active", static_cast<bool>(opCtx));
                  if (opCtx) {
                      infoBuilder.append("opid", opCtx->getOpID());
                      if (opCtx->isKillPending()) {
                          infoBuilder.append("killPending", true);
                      }
  
                      CurOp::get(opCtx)->reportState(&infoBuilder);
  
                      // LockState
                      Locker::LockerInfo lockerInfo;
                      opCtx->lockState()->getLockerInfo(&lockerInfo);
                      fillLockerInfo(lockerInfo, infoBuilder);
                  }
  
                  infoBuilder.done();
  
                  const BSONObj info = infoBuilder.obj();
  
                  if (includeAll || matcher.matches(info)) {
                      inprogBuilder.append(info);
                  }
              }
  
              inprogBuilder.done();
  
              if (lockedForWriting()) {
                  result.append("fsyncLock", true);
                  result.append("info",
                                "use db.fsyncUnlock() to terminate the fsync write/snapshot lock");
              }
  
              return true;
          }
  
      } currentOpCommand;
  
  }  // namespace mongo
  