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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/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/db/update/document_diff_serialization.h"
#include "mongo/db/update/log_builder_interface.h"
#include "mongo/db/update/runtime_update_path.h"
namespace mongo {
namespace v2_log_builder {
/**
* A log builder which can produce $v:2 oplog entries.
*
* This log builder accumulates updates, creates and deletes, and stores them in a tree. When the
* update is done and serialize() is called, the tree is converted into a $v:2 oplog entry. Note
* that we don't need a pre-image for building the oplog.
*/
class V2LogBuilder : public LogBuilderInterface {
public:
/**
* Overload methods from the LogBuilder interface.
*/
Status logUpdatedField(const RuntimeUpdatePath& path, mutablebson::Element elt) override;
Status logCreatedField(const RuntimeUpdatePath& path,
int idxOfFirstNewComponent,
mutablebson::Element elt) override;
Status logCreatedField(const RuntimeUpdatePath& path,
int idxOfFirstNewComponent,
BSONElement elt) override;
Status logDeletedField(const RuntimeUpdatePath& path) override;
/**
* Converts the in-memory tree to a $v:2 delta oplog entry.
*/
BSONObj serialize() const override;
private:
// Helpers for maintaining/updating the tree.
diff_tree::Node* createInternalNode(diff_tree::InternalNode* parent,
const RuntimeUpdatePath& fullPath,
size_t pathIdx,
bool newPath);
// Helpers for adding nodes at a certain path. Returns false if the path was invalid/did
// not exist.
void addNodeAtPathHelper(const RuntimeUpdatePath& path,
size_t pathIdx,
diff_tree::Node* root,
std::unique_ptr<diff_tree::Node> nodeToAdd,
boost::optional<size_t> idxOfFirstNewComponent);
void addNodeAtPath(const RuntimeUpdatePath& path,
diff_tree::Node* root,
std::unique_ptr<diff_tree::Node> nodeToAdd,
boost::optional<size_t> idxOfFirstNewComponent);
// Root of the tree.
diff_tree::DocumentSubDiffNode _root;
};
} // namespace v2_log_builder
} // namespace mongo
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