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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 <algorithm>
#include <memory>
#include <vector>
#include "mongo/db/op_observer.h"
namespace mongo {
/**
* Implementation of the OpObserver interface that allows multiple observers to be registered.
* All observers will be called in order of registration. Once an observer throws an exception,
* no further observers will receive notifications: typically the enclosing transaction will be
* aborted. If an observer needs to undo changes in such a case, it should register an onRollback
* handler with the recovery unit.
*/
class OpObserverRegistry final : public OpObserver {
OpObserverRegistry(const OpObserverRegistry&) = delete;
OpObserverRegistry& operator=(const OpObserverRegistry&) = delete;
public:
OpObserverRegistry() = default;
virtual ~OpObserverRegistry() = default;
// Add 'observer' to the list of observers to call. Observers are called in registration order.
// Registration must be done while no calls to observers are made.
void addObserver(std::unique_ptr<OpObserver> observer) {
_observers.push_back(std::move(observer));
}
void onCreateIndex(OperationContext* const opCtx,
const NamespaceString& nss,
CollectionUUID uuid,
BSONObj indexDoc,
bool fromMigrate) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onCreateIndex(opCtx, nss, uuid, indexDoc, fromMigrate);
}
virtual void onStartIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID collUUID,
const UUID& indexBuildUUID,
const std::vector<BSONObj>& indexes,
bool fromMigrate) override {
ReservedTimes times{opCtx};
for (auto& o : _observers) {
o->onStartIndexBuild(opCtx, nss, collUUID, indexBuildUUID, indexes, fromMigrate);
}
}
virtual void onStartIndexBuildSinglePhase(OperationContext* opCtx,
const NamespaceString& nss) override {
ReservedTimes times{opCtx};
for (auto& o : _observers) {
o->onStartIndexBuildSinglePhase(opCtx, nss);
}
}
virtual void onCommitIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID collUUID,
const UUID& indexBuildUUID,
const std::vector<BSONObj>& indexes,
bool fromMigrate) override {
ReservedTimes times{opCtx};
for (auto& o : _observers) {
o->onCommitIndexBuild(opCtx, nss, collUUID, indexBuildUUID, indexes, fromMigrate);
}
}
virtual void onAbortIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
CollectionUUID collUUID,
const UUID& indexBuildUUID,
const std::vector<BSONObj>& indexes,
const Status& cause,
bool fromMigrate) override {
ReservedTimes times{opCtx};
for (auto& o : _observers) {
o->onAbortIndexBuild(opCtx, nss, collUUID, indexBuildUUID, indexes, cause, fromMigrate);
}
}
void onInserts(OperationContext* const opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
std::vector<InsertStatement>::const_iterator begin,
std::vector<InsertStatement>::const_iterator end,
bool fromMigrate) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onInserts(opCtx, nss, uuid, begin, end, fromMigrate);
}
void onUpdate(OperationContext* const opCtx, const OplogUpdateEntryArgs& args) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onUpdate(opCtx, args);
}
void aboutToDelete(OperationContext* const opCtx,
const NamespaceString& nss,
const BSONObj& doc) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->aboutToDelete(opCtx, nss, doc);
}
void onDelete(OperationContext* const opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
StmtId stmtId,
bool fromMigrate,
const boost::optional<BSONObj>& deletedDoc) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onDelete(opCtx, nss, uuid, stmtId, fromMigrate, deletedDoc);
}
void onInternalOpMessage(OperationContext* const opCtx,
const NamespaceString& nss,
const boost::optional<UUID> uuid,
const BSONObj& msgObj,
const boost::optional<BSONObj> o2MsgObj) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onInternalOpMessage(opCtx, nss, uuid, msgObj, o2MsgObj);
}
void onCreateCollection(OperationContext* const opCtx,
Collection* coll,
const NamespaceString& collectionName,
const CollectionOptions& options,
const BSONObj& idIndex,
const OplogSlot& createOpTime) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onCreateCollection(opCtx, coll, collectionName, options, idIndex, createOpTime);
}
void onCollMod(OperationContext* const opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
const BSONObj& collModCmd,
const CollectionOptions& oldCollOptions,
boost::optional<TTLCollModInfo> ttlInfo) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onCollMod(opCtx, nss, uuid, collModCmd, oldCollOptions, ttlInfo);
}
void onDropDatabase(OperationContext* const opCtx, const std::string& dbName) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onDropDatabase(opCtx, dbName);
}
repl::OpTime onDropCollection(OperationContext* const opCtx,
const NamespaceString& collectionName,
const OptionalCollectionUUID uuid,
std::uint64_t numRecords,
const CollectionDropType dropType) override {
ReservedTimes times{opCtx};
for (auto& observer : this->_observers) {
auto time =
observer->onDropCollection(opCtx, collectionName, uuid, numRecords, dropType);
invariant(time.isNull());
}
return _getOpTimeToReturn(times.get().reservedOpTimes);
}
void onDropIndex(OperationContext* const opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
const std::string& indexName,
const BSONObj& idxDescriptor) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onDropIndex(opCtx, nss, uuid, indexName, idxDescriptor);
}
void onRenameCollection(OperationContext* const opCtx,
const NamespaceString& fromCollection,
const NamespaceString& toCollection,
OptionalCollectionUUID uuid,
OptionalCollectionUUID dropTargetUUID,
std::uint64_t numRecords,
bool stayTemp) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onRenameCollection(
opCtx, fromCollection, toCollection, uuid, dropTargetUUID, numRecords, stayTemp);
}
repl::OpTime preRenameCollection(OperationContext* const opCtx,
const NamespaceString& fromCollection,
const NamespaceString& toCollection,
OptionalCollectionUUID uuid,
OptionalCollectionUUID dropTargetUUID,
std::uint64_t numRecords,
bool stayTemp) override {
ReservedTimes times{opCtx};
for (auto& observer : this->_observers) {
const auto time = observer->preRenameCollection(
opCtx, fromCollection, toCollection, uuid, dropTargetUUID, numRecords, stayTemp);
invariant(time.isNull());
}
return _getOpTimeToReturn(times.get().reservedOpTimes);
}
void postRenameCollection(OperationContext* const opCtx,
const NamespaceString& fromCollection,
const NamespaceString& toCollection,
OptionalCollectionUUID uuid,
OptionalCollectionUUID dropTargetUUID,
bool stayTemp) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->postRenameCollection(
opCtx, fromCollection, toCollection, uuid, dropTargetUUID, stayTemp);
}
void onApplyOps(OperationContext* const opCtx,
const std::string& dbName,
const BSONObj& applyOpCmd) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onApplyOps(opCtx, dbName, applyOpCmd);
}
void onEmptyCapped(OperationContext* const opCtx,
const NamespaceString& collectionName,
OptionalCollectionUUID uuid) {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onEmptyCapped(opCtx, collectionName, uuid);
}
void onUnpreparedTransactionCommit(OperationContext* opCtx,
std::vector<repl::ReplOperation>* statements,
size_t numberOfPreImagesToWrite) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onUnpreparedTransactionCommit(opCtx, statements, numberOfPreImagesToWrite);
}
void onPreparedTransactionCommit(
OperationContext* opCtx,
OplogSlot commitOplogEntryOpTime,
Timestamp commitTimestamp,
const std::vector<repl::ReplOperation>& statements) noexcept override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onPreparedTransactionCommit(
opCtx, commitOplogEntryOpTime, commitTimestamp, statements);
}
void onTransactionPrepare(OperationContext* opCtx,
const std::vector<OplogSlot>& reservedSlots,
std::vector<repl::ReplOperation>* statements,
size_t numberOfPreImagesToWrite) override {
ReservedTimes times{opCtx};
for (auto& observer : _observers) {
observer->onTransactionPrepare(
opCtx, reservedSlots, statements, numberOfPreImagesToWrite);
}
}
void onTransactionAbort(OperationContext* opCtx,
boost::optional<OplogSlot> abortOplogEntryOpTime) override {
ReservedTimes times{opCtx};
for (auto& o : _observers)
o->onTransactionAbort(opCtx, abortOplogEntryOpTime);
}
void onReplicationRollback(OperationContext* opCtx,
const RollbackObserverInfo& rbInfo) override {
for (auto& o : _observers)
o->onReplicationRollback(opCtx, rbInfo);
}
private:
static repl::OpTime _getOpTimeToReturn(const std::vector<repl::OpTime>& times) {
if (times.empty()) {
return repl::OpTime{};
}
invariant(times.size() == 1);
return times.front();
}
std::vector<std::unique_ptr<OpObserver>> _observers;
};
} // namespace mongo
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