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path: root/src/mongo/db/commands/top_command.cpp
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/*
 *    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.
 */

#include "mongo/platform/basic.h"

#include "mongo/base/init.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/client.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/stats/top.h"
#include "mongo/db/commands.h"

namespace {

    using namespace mongo;

    class TopCommand : public Command {
    public:
        TopCommand() : Command("top", true) {}

        virtual bool slaveOk() const { return true; }
        virtual bool adminOnly() const { return true; }
        virtual bool isWriteCommandForConfigServer() const { return false; }
        virtual void help(std::stringstream& help) const {
            help << "usage by collection, in micros ";
        }
        virtual void addRequiredPrivileges(const std::string& dbname,
                                           const BSONObj& cmdObj,
                                           std::vector<Privilege>* out) {
            ActionSet actions;
            actions.addAction(ActionType::top);
            out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
        }
        virtual bool run(OperationContext* txn,
                         const std::string& db,
                         BSONObj& cmdObj,
                         int options,
                         std::string& errmsg,
                         BSONObjBuilder& result) {
            {
                BSONObjBuilder b( result.subobjStart( "totals" ) );
                b.append( "note", "all times in microseconds" );
                Top::get(txn->getClient()->getServiceContext()).append(b);
                b.done();
            }
            return true;
        }

    };

    //
    // Command instance.
    // Registers command with the command system and make command
    // available to the client.
    //

    MONGO_INITIALIZER(RegisterTopCommand)(InitializerContext* context) {

        new TopCommand();

        return Status::OK();
    }
} // namespace