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/**
* Copyright (C) 2021-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/pipeline/document_source_change_stream.h"
#include "mongo/db/pipeline/document_source_change_stream_gen.h"
namespace mongo::change_stream_legacy {
/**
* Looks up and returns a pre-image document at the specified opTime in the oplog. Asserts that if
* an oplog entry with the given opTime is found, it is a no-op entry with a valid non-empty
* pre-image document.
*/
boost::optional<Document> legacyLookupPreImage(boost::intrusive_ptr<ExpressionContext> pExpCtx,
const Document& preImageId);
/**
* Represents the change stream operation types that are NOT guarded behind the 'showExpandedEvents'
* flag.
*/
static const std::set<StringData> kClassicOperationTypes =
std::set<StringData>{DocumentSourceChangeStream::kUpdateOpType,
DocumentSourceChangeStream::kDeleteOpType,
DocumentSourceChangeStream::kReplaceOpType,
DocumentSourceChangeStream::kInsertOpType,
DocumentSourceChangeStream::kDropCollectionOpType,
DocumentSourceChangeStream::kRenameCollectionOpType,
DocumentSourceChangeStream::kDropDatabaseOpType,
DocumentSourceChangeStream::kInvalidateOpType,
DocumentSourceChangeStream::kReshardBeginOpType,
DocumentSourceChangeStream::kReshardDoneCatchUpOpType,
DocumentSourceChangeStream::kNewShardDetectedOpType};
/**
* Adds filtering for legacy-format {op: 'n'} oplog messages, which used the "o2.type" field to
* indicate the message type.
*/
void populateInternalOperationFilter(const boost::intrusive_ptr<ExpressionContext>& expCtx,
BSONArrayBuilder* filter);
/**
* Converts legacy-format oplog o2 fields of type {type: <op name>, ...} to
* {..., <op name>: <namespace>}. Does nothing if the 'type' field is not present inside 'o2'.
*/
Document convertFromLegacyOplogFormat(const Document& legacyO2Entry, const NamespaceString& nss);
StringData getNewShardDetectedOpName(const boost::intrusive_ptr<ExpressionContext>& expCtx);
} // namespace mongo::change_stream_legacy
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