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/**
* 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.
*/
#pragma once
#include <boost/optional.hpp>
#include <memory>
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/rpc/metadata/client_metadata.h"
namespace mongo {
class Client;
/**
* ClientMetadataIsMasterState is responsible for tracking whether the client metadata document has
* been received by the specified Client object.
*/
class ClientMetadataIsMasterState {
MONGO_DISALLOW_COPYING(ClientMetadataIsMasterState);
public:
ClientMetadataIsMasterState() = default;
static ClientMetadataIsMasterState& get(Client* client);
/**
* Get the optional client metadata object.
*/
const boost::optional<ClientMetadata>& getClientMetadata() const;
/**
* Set the optional client metadata object.
*/
static void setClientMetadata(Client* client, boost::optional<ClientMetadata> clientMetadata);
/**
* Check a flag to indicate that isMaster has been seen for this Client.
*/
bool hasSeenIsMaster() const;
/**
* Set a flag to indicate that isMaster has been seen for this Client.
*/
void setSeenIsMaster();
/**
* Read from the $client section of OP_Command's metadata.
*
* Returns an error if the $client section is not valid. It is valid for it to not exist though.
*
* Thread-Safety:
* None - must be only be read and written from the thread owning "Client".
*/
static Status readFromMetadata(OperationContext* txn, BSONElement& elem);
/**
* Write the $client section to OP_Command's metadata if there is a non-empty client metadata
* connection with the current client.
*
* Thread-Safety:
* None - must be only be read and written from the thread owning "Client".
*/
static void writeToMetadata(OperationContext* txn, BSONObjBuilder* builder);
private:
// Optional client metadata document.
// Set if client sees isMaster cmd or as part of OP_Command processing.
// Thread-Safety:
// Can be read and written from the thread owning "Client".
// Can be read from other threads if they hold the "Client" lock.
boost::optional<ClientMetadata> _clientMetadata{boost::none};
// Indicates whether we have seen an is master for this client.
// Thread-Safety:
// None - must be only be read and written from the thread owning "Client".
bool _hasSeenIsMaster{false};
};
} // namespace mongo
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