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/**
* Copyright (C) 2020-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/op_observer/op_observer_noop.h"
#include "mongo/util/version/releases.h"
namespace mongo {
/**
* OpObserver for Feature Compatibility Version (FCV).
* Observes all writes to the FCV document under admin.system.version and sets the in-memory FCV
* value.
*/
class FcvOpObserver final : public OpObserverNoop {
FcvOpObserver(const FcvOpObserver&) = delete;
FcvOpObserver& operator=(const FcvOpObserver&) = delete;
public:
FcvOpObserver() = default;
~FcvOpObserver() = default;
// FcvOpObserver overrides.
void onInserts(OperationContext* opCtx,
const CollectionPtr& coll,
std::vector<InsertStatement>::const_iterator first,
std::vector<InsertStatement>::const_iterator last,
std::vector<bool> fromMigrate,
bool defaultFromMigrate,
InsertsOpStateAccumulator* opAccumulator = nullptr) final;
void onInsertGlobalIndexKey(OperationContext* opCtx,
const NamespaceString& globalIndexNss,
const UUID& globalIndexUuid,
const BSONObj& key,
const BSONObj& docKey) final{};
void onDeleteGlobalIndexKey(OperationContext* opCtx,
const NamespaceString& globalIndexNss,
const UUID& globalIndexUuid,
const BSONObj& key,
const BSONObj& docKey) final {}
void onUpdate(OperationContext* opCtx,
const OplogUpdateEntryArgs& args,
OpStateAccumulator* opAccumulator = nullptr) final;
void onDelete(OperationContext* opCtx,
const CollectionPtr& coll,
StmtId stmtId,
const OplogDeleteEntryArgs& args,
OpStateAccumulator* opAccumulator = nullptr) final;
void onReplicationRollback(OperationContext* opCtx, const RollbackObserverInfo& rbInfo) final;
private:
/**
* Set the FCV to newVersion, making sure to close any outgoing connections with incompatible
* servers and closing open transactions if necessary. Increments the server TopologyVersion.
*/
static void _setVersion(OperationContext* opCtx,
multiversion::FeatureCompatibilityVersion newVersion,
bool onRollback,
boost::optional<Timestamp> commitTs = boost::none);
/**
* Examines a document inserted or updated in the server configuration collection
* (admin.system.version). If it is the featureCompatibilityVersion document, validates the
* document and on commit, updates the server parameter.
*/
static void _onInsertOrUpdate(OperationContext* opCtx, const BSONObj& doc);
};
} // namespace mongo
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