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/**
* Copyright (C) 2018 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 "mongo/db/server_options.h"
namespace mongo {
/**
* Helpers to parse featureCompatibilityVersion document BSON objects into
* ServerGlobalParams::FeatureCompatibility::Version enums and convert
* ServerGlobalParams::FeatureCompatibility::Version enums into strings.
*/
class FeatureCompatibilityVersionParser {
public:
static constexpr StringData kVersion40 = "4.0"_sd;
static constexpr StringData kVersion42 = "4.2"_sd;
static constexpr StringData kVersionDowngradingTo40 = "downgrading to 4.0"_sd;
static constexpr StringData kVersionUpgradingTo42 = "upgrading to 4.2"_sd;
static constexpr StringData kVersionUnset = "Unset"_sd;
static constexpr StringData kParameterName = "featureCompatibilityVersion"_sd;
static constexpr StringData kVersionField = "version"_sd;
static constexpr StringData kTargetVersionField = "targetVersion"_sd;
/**
* Parses the featureCompatibilityVersion document from the server configuration collection
* (admin.system.version), and returns the state represented by the combination of the
* targetVersion and version.
*/
static StatusWith<ServerGlobalParams::FeatureCompatibility::Version> parse(
const BSONObj& featureCompatibilityVersionDoc);
/**
* Useful for message logging.
*/
static StringData toString(ServerGlobalParams::FeatureCompatibility::Version version) {
switch (version) {
case ServerGlobalParams::FeatureCompatibility::Version::kUnsetDefault40Behavior:
return kVersionUnset;
case ServerGlobalParams::FeatureCompatibility::Version::kFullyDowngradedTo40:
return kVersion40;
case ServerGlobalParams::FeatureCompatibility::Version::kUpgradingTo42:
return kVersionUpgradingTo42;
case ServerGlobalParams::FeatureCompatibility::Version::kDowngradingTo40:
return kVersionDowngradingTo40;
case ServerGlobalParams::FeatureCompatibility::Version::kFullyUpgradedTo42:
return kVersion42;
default:
MONGO_UNREACHABLE;
}
}
};
} // namespace mongo
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