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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.
*/
#pragma once
#include <memory>
#include "mongo/base/string_data.h"
#include "mongo/db/repl/optime.h"
#include "mongo/rpc/metadata/metadata_hook.h"
#include "mongo/s/client/shard.h"
namespace mongo {
class Shard;
namespace rpc {
class ShardingEgressMetadataHook : public rpc::EgressMetadataHook {
public:
virtual ~ShardingEgressMetadataHook() = default;
Status readReplyMetadata(const HostAndPort& replySource, const BSONObj& metadataObj) override;
Status writeRequestMetadata(OperationContext* txn,
const HostAndPort& target,
BSONObjBuilder* metadataBob) override;
// These overloaded methods exist to allow ShardingConnectionHook, which is soon to be
// deprecated, to use the logic in ShardingEgressMetadataHook instead of duplicating the
// logic. ShardingConnectionHook must provide the replySource and target as strings rather than
// HostAndPorts, since DBClientReplicaSet uses the hook before it decides on the actual host to
// contact.
Status readReplyMetadata(const StringData replySource, const BSONObj& metadataObj);
Status writeRequestMetadata(bool shardedConnection,
OperationContext* txn,
const StringData target,
BSONObjBuilder* metadataBob);
protected:
/**
* On mongod this is a no-op.
* On mongos it looks for $gleStats in a command's reply metadata, and fills in the
* ClusterLastErrorInfo for this thread's associated Client with the data, if found.
* This data will be used by subsequent GLE calls, to ensure we look for the correct write on
* the correct PRIMARY.
*/
virtual void _saveGLEStats(const BSONObj& metadata, StringData hostString) = 0;
/**
* Called by writeRequestMetadata() to find the config server optime that should be sent as part
* of the ConfigServerMetadata.
*/
virtual repl::OpTime _getConfigServerOpTime() = 0;
/**
* On config servers this is a no-op.
* On shards and mongoses this advances the Grid's stored config server optime based on the
* metadata in the response object from running a command.
*/
virtual Status _advanceConfigOptimeFromShard(ShardId shardId, const BSONObj& metadataObj);
};
} // namespace rpc
} // namespace mongo
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