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/**
* Copyright (C) 2018-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 <fmt/format.h>
#include "mongo/rpc/message.h"
#include "mongo/util/assert_util.h"
namespace mongo {
namespace rpc {
/**
* Bit flags representing support for a particular RPC protocol. This is just an internal
* representation, and is never transmitted over the wire. It should never be used for any other
* feature detection in favor of max/min wire version.
*
* The system only currently offers full support for the OP_MSG protocol. However, it can continue
* to handle OP_QUERY in some limited cases, in particular for the hello/isMaster command sent by
* clients on connection open.
*/
enum class Protocol : std::uint64_t {
/**
* The pre-3.6 OP_QUERY on db.$cmd protocol
*/
kOpQuery = 1 << 0,
/**
* The 3.6+ OP_MSG protocol.
*/
kOpMsg = 1 << 1,
};
inline Protocol protocolForMessage(const Message& message) {
switch (message.operation()) {
case mongo::dbMsg:
return Protocol::kOpMsg;
case mongo::dbQuery:
return Protocol::kOpQuery;
default:
uasserted(ErrorCodes::UnsupportedFormat,
fmt::format("Received a reply message with unexpected opcode: {}",
message.operation()));
}
}
} // namespace rpc
} // namespace mongo
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