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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 <tuple>
#include "mongo/base/status_with.h"
#include "mongo/rpc/op_msg.h"
#include "mongo/stdx/functional.h"
namespace mongo {
class BSONObj;
class BSONObjBuilder;
class OperationContext;
class StringData;
/**
* Utilities for dealing with what used to be called metadata.
*/
namespace rpc {
/**
* Returns an empty metadata object.
*/
BSONObj makeEmptyMetadata();
/**
* Reads metadata from a metadata object and sets it on this OperationContext.
*/
void readRequestMetadata(OperationContext* opCtx, const BSONObj& metadataObj, bool requiresAuth);
/**
* A legacy command object and a corresponding query flags bitfield. The legacy command object
* may contain metadata fields, so it cannot safely be passed to a command's run method.
*/
using LegacyCommandAndFlags = std::tuple<BSONObj, int>;
/**
* Upconverts a legacy command request into an OpMessageRequest.
*/
OpMsgRequest upconvertRequest(StringData db, BSONObj legacyCmdObj, int queryFlags);
/**
* A function type for writing request metadata. The function takes a pointer to an optional
* OperationContext so metadata associated with a Client can be appended, a pointer to a
* BSONObjBuilder used to construct the metadata object and returns a Status indicating if the
* metadata was written successfully.
*/
using RequestMetadataWriter =
stdx::function<Status(OperationContext* opCtx, BSONObjBuilder* metadataBuilder)>;
/**
* A function type for reading reply metadata. The function takes a a reference to a
* metadata object received in a command reply and the server address of the
* host that executed the command and returns a Status indicating if the
* metadata was read successfully.
*
* TODO: would it be a layering violation if this hook took an OperationContext* ?
*/
using ReplyMetadataReader = stdx::function<Status(
OperationContext* opCtx, const BSONObj& replyMetadata, StringData sourceHost)>;
} // namespace rpc
} // namespace mongo
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