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/**
* Copyright (C) 2020-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.
*/
#pragma once
#include "mongo/rpc/topology_version_gen.h"
#include <boost/optional.hpp>
#include <string>
namespace mongo {
class BSONObj;
class BSONObjBuilder;
/**
* Response structure for the hello command.
*
* Only handles responses from mongos.
*/
class MongosHelloResponse {
public:
static constexpr StringData kTopologyVersionFieldName = "topologyVersion"_sd;
static constexpr StringData kIsMasterFieldName = "ismaster"_sd;
static constexpr StringData kIsWritablePrimaryFieldName = "isWritablePrimary"_sd;
static constexpr StringData kMsgFieldName = "msg"_sd;
/**
* Explicit constructor that sets the _topologyVersion field.
*/
MongosHelloResponse(TopologyVersion topologyVersion);
/**
* Appends MongosHelloResponse fields to "builder". When true, "useLegacyResponseFields"
* indicates that we are responding to an isMaster command and not a hello command. Attach
* the legacy "ismaster" field if true, and the "isWritablePrimary" field otherwise.
*/
void appendToBuilder(BSONObjBuilder* builder, bool useLegacyResponseFields) const;
TopologyVersion getTopologyVersion() const {
return _topologyVersion;
}
bool getIsWritablePrimary() const {
return _isWritablePrimary;
}
std::string getMsg() const {
return _msg;
}
private:
TopologyVersion _topologyVersion;
bool _isWritablePrimary;
std::string _msg;
};
} // namespace mongo
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