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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/update/path_creating_node.h"
#include "mongo/db/update/path_support.h"
namespace mongo {
void PathCreatingNode::apply(mutablebson::Element element,
FieldRef* pathToCreate,
FieldRef* pathTaken,
StringData matchedField,
bool fromReplication,
const UpdateIndexData* indexData,
LogBuilder* logBuilder,
bool* indexesAffected,
bool* noop) const {
*indexesAffected = false;
*noop = false;
// The value in this Element gets used to create a logging entry (if we have a LogBuilder).
mutablebson::Element valueToLog = element.getDocument().end();
if (pathToCreate->empty()) {
// We found an existing element at the update path.
updateExistingElement(&element, noop);
if (*noop) {
return; // Successful no-op update.
}
valueToLog = element;
} else {
// We did not find an element at the update path. Create one.
auto newElementFieldName = pathToCreate->getPart(pathToCreate->numParts() - 1);
auto newElement = element.getDocument().makeElementNull(newElementFieldName);
setValueForNewElement(&newElement);
invariant(newElement.ok());
auto status = pathsupport::createPathAt(*pathToCreate, 0, element, newElement);
if (!status.isOK()) {
// $sets on non-viable paths are ignored when the update came from replication. We do
// not error because idempotency requires that any other update modifiers must still be
// applied. For example, consider applying the following updates twice to an initially
// empty document:
// {$set: {c: 0}}
// {$set: {'a.b': 0, c: 1}}
// {$set: {a: 0}}
// Setting 'a.b' will fail the second time, but we must still set 'c'.
// (There are modifiers besides $set that use this code path, but they are not used for
// replication, so we are not concerned with their behavior when "fromReplication" is
// true.)
if (status.code() == ErrorCodes::PathNotViable && fromReplication) {
*noop = true;
return;
}
uassertStatusOK(status);
MONGO_UNREACHABLE; // The previous uassertStatusOK should always throw.
}
valueToLog = newElement;
}
// Create full field path of set element.
StringBuilder builder;
builder << pathTaken->dottedField();
if (!pathTaken->empty() && !pathToCreate->empty()) {
builder << ".";
}
builder << pathToCreate->dottedField();
auto fullPath = builder.str();
// Determine if indexes are affected.
if (indexData && indexData->mightBeIndexed(fullPath)) {
*indexesAffected = true;
}
// Log the operation.
if (logBuilder) {
auto logElement =
logBuilder->getDocument().makeElementWithNewFieldName(fullPath, valueToLog);
invariant(logElement.ok());
uassertStatusOK(logBuilder->addToSets(logElement));
}
}
} // namespace mongo
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