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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_noop.h"
#include "mongo/db/server_options.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 OpObserver {
FcvOpObserver(const FcvOpObserver&) = delete;
FcvOpObserver& operator=(const FcvOpObserver&) = delete;
public:
FcvOpObserver() = default;
~FcvOpObserver() = default;
// FcvOpObserver overrides.
void onInserts(OperationContext* opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
std::vector<InsertStatement>::const_iterator first,
std::vector<InsertStatement>::const_iterator last,
bool fromMigrate) final;
void onUpdate(OperationContext* opCtx, const OplogUpdateEntryArgs& args) final;
void onDelete(OperationContext* opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
StmtId stmtId,
bool fromMigrate,
const boost::optional<BSONObj>& deletedDoc) final;
void onReplicationRollback(OperationContext* opCtx, const RollbackObserverInfo& rbInfo) final;
// Noop overrides.
void onCreateIndex(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID uuid,
BSONObj indexDoc,
bool fromMigrate) final {}
void onStartIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID collUUID,
const UUID& indexBuildUUID,
const std::vector<BSONObj>& indexes,
bool fromMigrate) final {}
void onStartIndexBuildSinglePhase(OperationContext* opCtx, const NamespaceString& nss) final {}
void onCommitIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID collUUID,
const UUID& indexBuildUUID,
const std::vector<BSONObj>& indexes,
bool fromMigrate) final {}
void onAbortIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID collUUID,
const UUID& indexBuildUUID,
const std::vector<BSONObj>& indexes,
const Status& cause,
bool fromMigrate) final {}
void aboutToDelete(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& doc) final {}
void onInternalOpMessage(OperationContext* opCtx,
const NamespaceString& nss,
const boost::optional<UUID> uuid,
const BSONObj& msgObj,
const boost::optional<BSONObj> o2MsgObj,
const boost::optional<repl::OpTime> preImageOpTime,
const boost::optional<repl::OpTime> postImageOpTime,
const boost::optional<repl::OpTime> prevWriteOpTimeInTransaction,
const boost::optional<OplogSlot> slot) final {}
void onCreateCollection(OperationContext* opCtx,
const CollectionPtr& coll,
const NamespaceString& collectionName,
const CollectionOptions& options,
const BSONObj& idIndex,
const OplogSlot& createOpTime) final {}
void onCollMod(OperationContext* opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
const BSONObj& collModCmd,
const CollectionOptions& oldCollOptions,
boost::optional<IndexCollModInfo> indexInfo) final {}
void onDropDatabase(OperationContext* opCtx, const std::string& dbName) final {}
repl::OpTime onDropCollection(OperationContext* opCtx,
const NamespaceString& collectionName,
OptionalCollectionUUID uuid,
std::uint64_t numRecords,
const CollectionDropType dropType) final {
return {};
}
void onDropIndex(OperationContext* opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
const std::string& indexName,
const BSONObj& idxDescriptor) final {}
void onRenameCollection(OperationContext* opCtx,
const NamespaceString& fromCollection,
const NamespaceString& toCollection,
OptionalCollectionUUID uuid,
OptionalCollectionUUID dropTargetUUID,
std::uint64_t numRecords,
bool stayTemp) final {}
repl::OpTime preRenameCollection(OperationContext* opCtx,
const NamespaceString& fromCollection,
const NamespaceString& toCollection,
OptionalCollectionUUID uuid,
OptionalCollectionUUID dropTargetUUID,
std::uint64_t numRecords,
bool stayTemp) final {
return {};
}
void postRenameCollection(OperationContext* opCtx,
const NamespaceString& fromCollection,
const NamespaceString& toCollection,
OptionalCollectionUUID uuid,
OptionalCollectionUUID dropTargetUUID,
bool stayTemp) final {}
void onApplyOps(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& applyOpCmd) final {}
void onEmptyCapped(OperationContext* opCtx,
const NamespaceString& collectionName,
OptionalCollectionUUID uuid) final {}
void onUnpreparedTransactionCommit(OperationContext* opCtx,
std::vector<repl::ReplOperation>* statements,
size_t numberOfPreImagesToWrite) final {}
void onPreparedTransactionCommit(
OperationContext* opCtx,
OplogSlot commitOplogEntryOpTime,
Timestamp commitTimestamp,
const std::vector<repl::ReplOperation>& statements) noexcept final{};
void onTransactionPrepare(OperationContext* opCtx,
const std::vector<OplogSlot>& reservedSlots,
std::vector<repl::ReplOperation>* statements,
size_t numberOfPreImagesToWrite) final{};
void onTransactionAbort(OperationContext* opCtx,
boost::optional<OplogSlot> abortOplogEntryOpTime) final{};
void onMajorityCommitPointUpdate(ServiceContext* service,
const repl::OpTime& newCommitPoint) 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,
ServerGlobalParams::FeatureCompatibility::Version newVersion);
/**
* 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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