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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 <string>
#include <vector>
#include "mongo/base/owned_pointer_vector.h"
#include "mongo/base/status.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/db/field_ref_set.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/update/modifier_table.h"
#include "mongo/db/update/update_object_node.h"
#include "mongo/db/update_index_data.h"
namespace mongo {
class CollatorInterface;
class OperationContext;
class UpdateDriver {
public:
UpdateDriver(const boost::intrusive_ptr<ExpressionContext>& expCtx);
/**
* Parses the 'updateExpr' update expression into the '_root' member variable. Uasserts
* if 'updateExpr' fails to parse.
*/
void parse(const BSONObj& updateExpr,
const std::map<StringData, std::unique_ptr<ExpressionWithPlaceholder>>& arrayFilters,
const bool multi = false);
/**
* Fills in document with any fields in the query which are valid.
*
* Valid fields include equality matches like "a":1, or "a.b":false
*
* Each valid field will be expanded (from dot notation) and conflicts will be
* checked for all fields added to the underlying document.
*
* Returns Status::OK() if the document can be used. If there are any error or
* conflicts along the way then those errors will be returned.
*
* If the current update is a document replacement, only the 'immutablePaths' are extracted from
* 'query' and used to populate 'doc'.
*/
Status populateDocumentWithQueryFields(OperationContext* opCtx,
const BSONObj& query,
const FieldRefSet& immutablePaths,
mutablebson::Document& doc) const;
Status populateDocumentWithQueryFields(const CanonicalQuery& query,
const FieldRefSet& immutablePaths,
mutablebson::Document& doc) const;
/**
* Executes the update over 'doc'. If any modifier is positional, use 'matchedField' (index of
* the array item matched). If 'doc' allows the modifiers to be applied in place and no index
* updating is involved, then the modifiers may be applied "in place" over 'doc'.
*
* If the driver's '_logOp' mode is turned on, and if 'logOpRec' is not null, fills in the
* latter with the oplog entry corresponding to the update. If the modifiers can't be applied,
* returns an error status or uasserts with a corresponding description.
*
* If 'validateForStorage' is true, ensures that modified elements do not violate depth or DBRef
* constraints. Ensures that no paths in 'immutablePaths' are modified (though they may be
* created, if they do not yet exist).
*
* The value of 'isInsert' controls whether $setOnInsert modifiers get applied.
*
* If 'modifiedPaths' is not null, this method will populate it with the set of paths that were
* either modified at runtime or present statically in the update modifiers. For arrays, the
* set will include only the path to the array if the length has changed. All paths encode array
* indexes explicitly.
*
* The caller must either provide a null pointer, or a non-null pointer to an empty field ref
* set.
*/
Status update(StringData matchedField,
mutablebson::Document* doc,
bool validateForStorage,
const FieldRefSet& immutablePaths,
bool isInsert,
BSONObj* logOpRec = nullptr,
bool* docWasModified = nullptr,
FieldRefSetWithStorage* modifiedPaths = nullptr);
//
// Accessors
//
bool isDocReplacement() const;
static bool isDocReplacement(const BSONObj& updateExpr);
bool modsAffectIndices() const;
void refreshIndexKeys(const UpdateIndexData* indexedFields);
bool logOp() const;
void setLogOp(bool logOp);
bool fromOplogApplication() const;
void setFromOplogApplication(bool fromOplogApplication);
mutablebson::Document& getDocument() {
return _objDoc;
}
const mutablebson::Document& getDocument() const {
return _objDoc;
}
bool needMatchDetails() const {
return _positional;
}
/**
* Set the collator which will be used by all of the UpdateDriver's underlying modifiers.
*
* 'collator' must outlive the UpdateDriver.
*/
void setCollator(const CollatorInterface* collator);
private:
/** Create the modifier and add it to the back of the modifiers vector */
inline Status addAndParse(const modifiertable::ModifierType type, const BSONElement& elem);
//
// immutable properties after parsing
//
// Is this a full object replacement or do we have update modifiers in the '_root' UpdateNode
// tree?
bool _replacementMode = false;
// The root of the UpdateNode tree.
std::unique_ptr<UpdateNode> _root;
// What are the list of fields in the collection over which the update is going to be
// applied that participate in indices?
//
// NOTE: Owned by the collection's info cache!.
const UpdateIndexData* _indexedFields = nullptr;
//
// mutable properties after parsing
//
// Should this driver generate an oplog record when it applies the update?
bool _logOp = false;
// True if this update comes from an oplog application.
bool _fromOplogApplication = false;
boost::intrusive_ptr<ExpressionContext> _expCtx;
// Are any of the fields mentioned in the mods participating in any index? Is set anew
// at each call to update.
bool _affectIndices = false;
// Do any of the mods require positional match details when calling 'prepare'?
bool _positional = false;
// The document used to represent or store the object being updated.
mutablebson::Document _objDoc;
// The document used to build the oplog entry for the update.
mutablebson::Document _logDoc;
};
} // namespace mongo
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