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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 "mongo/db/server_options.h"
namespace mongo {
using FeatureCompatibilityParams = ServerGlobalParams::FeatureCompatibility;
/**
* 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 kVersion44 = "4.4"_sd;
static constexpr StringData kVersion47 = "4.7"_sd;
static constexpr StringData kVersion48 = "4.8"_sd;
static constexpr StringData kVersionDowngradingFrom47To44 = "downgrading from 4.7 to 4.4"_sd;
static constexpr StringData kVersionDowngradingFrom48To44 = "downgrading from 4.8 to 4.4"_sd;
static constexpr StringData kVersionDowngradingFrom48To47 = "downgrading from 4.8 to 4.7"_sd;
static constexpr StringData kVersionUpgradingFrom44To47 = "upgrading from 4.4 to 4.7"_sd;
static constexpr StringData kVersionUpgradingFrom47To48 = "upgrading from 4.7 to 4.8"_sd;
static constexpr StringData kVersionUpgradingFrom44To48 = "upgrading from 4.4 to 4.8"_sd;
static constexpr StringData kVersionDowngradingFrom49To44 = "downgrading from 4.9 to 4.4"_sd;
static constexpr StringData kVersionUpgradingFrom44To49 = "upgrading from 4.4 to 4.9"_sd;
static constexpr StringData kVersionDowngradingFrom49To48 = "downgrading from 4.9 to 4.8"_sd;
static constexpr StringData kVersionUpgradingFrom48To49 = "upgrading from 4.8 to 4.9"_sd;
static constexpr StringData kVersion49 = "4.9"_sd;
static constexpr StringData kVersionUnset = "Unset"_sd;
static constexpr StringData kParameterName = "featureCompatibilityVersion"_sd;
static constexpr StringData kLastLTS = kVersion44;
static constexpr StringData kLastContinuous = kVersion48;
static constexpr StringData kLatest = kVersion49;
static constexpr StringData kUpgradingFromLastLTSToLatest = kVersionUpgradingFrom44To49;
static constexpr StringData kUpgradingFromLastContinuousToLatest = kVersionUpgradingFrom48To49;
// kVersionUpgradingFromLastLTSToLastContinuous should assigned kVersionUnset when kLastLTS and
// kLastContinuous are equal.
static constexpr StringData kVersionUpgradingFromLastLTSToLastContinuous =
kVersionUpgradingFrom44To48;
static constexpr StringData kDowngradingFromLatestToLastLTS = kVersionDowngradingFrom49To44;
static constexpr StringData kDowngradingFromLatestToLastContinuous =
kVersionDowngradingFrom49To48;
static FeatureCompatibilityParams::Version parseVersion(StringData versionString);
static StringData serializeVersion(FeatureCompatibilityParams::Version version);
static Status validatePreviousVersionField(FeatureCompatibilityParams::Version version);
/**
* 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<FeatureCompatibilityParams::Version> parse(
const BSONObj& featureCompatibilityVersionDoc);
/**
* Useful for message logging.
*/
static StringData toString(FeatureCompatibilityParams::Version version) {
if (version == FeatureCompatibilityParams::Version::kUnsetDefault44Behavior) {
return kVersionUnset;
} else if (version == FeatureCompatibilityParams::kLastLTS) {
return kLastLTS;
} else if (version == FeatureCompatibilityParams::kDowngradingFromLatestToLastLTS) {
return kDowngradingFromLatestToLastLTS;
} else if (version == FeatureCompatibilityParams::kUpgradingFromLastLTSToLastContinuous) {
// kUpgradingFromLastLTSToLastContinuous is only a valid FCV state when last-continuous
// and last-lts are not equal. Otherwise, it is set to kInvalid.
invariant(version != FeatureCompatibilityParams::Version::kInvalid);
return kVersionUpgradingFromLastLTSToLastContinuous;
} else if (version == FeatureCompatibilityParams::kUpgradingFromLastLTSToLatest) {
return kUpgradingFromLastLTSToLatest;
} else if (version == FeatureCompatibilityParams::kLastContinuous) {
return kLastContinuous;
} else if (version == FeatureCompatibilityParams::kDowngradingFromLatestToLastContinuous) {
return kDowngradingFromLatestToLastContinuous;
} else if (version == FeatureCompatibilityParams::kUpgradingFromLastContinuousToLatest) {
return kUpgradingFromLastContinuousToLatest;
} else if (version == FeatureCompatibilityParams::kLatest) {
return kLatest;
}
MONGO_UNREACHABLE;
}
};
} // namespace mongo
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