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/**
* Copyright (C) 2013 10gen 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/db/update/log_builder.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using mutablebson::Element;
namespace str = mongoutils::str;
namespace {
const char kSet[] = "$set";
const char kUnset[] = "$unset";
} // namespace
constexpr StringData LogBuilder::kUpdateSemanticsFieldName;
inline Status LogBuilder::addToSection(Element newElt, Element* section, const char* sectionName) {
// If we don't already have this section, try to create it now.
if (!section->ok()) {
// If we already have object replacement data, we can't also have section entries.
if (hasObjectReplacement())
return Status(ErrorCodes::IllegalOperation,
"LogBuilder: Invalid attempt to add a $set/$unset entry"
"to a log with an existing object replacement");
mutablebson::Document& doc = _logRoot.getDocument();
// We should not already have an element with the section name under the root.
dassert(_logRoot[sectionName] == doc.end());
// Construct a new object element to represent this section in the log.
const Element newElement = doc.makeElementObject(sectionName);
if (!newElement.ok())
return Status(ErrorCodes::InternalError,
"LogBuilder: failed to construct Object Element for $set/$unset");
// Enqueue the new section under the root, and record it as our out parameter.
Status result = _logRoot.pushBack(newElement);
if (!result.isOK())
return result;
*section = newElement;
// Invalidate attempts to add an object replacement, now that we have a named
// section under the root.
_objectReplacementAccumulator = doc.end();
}
// Whatever transpired, we should now have an ok accumulator for the section, and not
// have a replacement accumulator.
dassert(section->ok());
dassert(!_objectReplacementAccumulator.ok());
// Enqueue the provided element to the section and propagate the result.
return section->pushBack(newElt);
}
Status LogBuilder::addToSets(Element elt) {
return addToSection(elt, &_setAccumulator, kSet);
}
Status LogBuilder::addToSetsWithNewFieldName(StringData name, const mutablebson::Element val) {
mutablebson::Element elemToSet = _logRoot.getDocument().makeElementWithNewFieldName(name, val);
if (!elemToSet.ok())
return Status(ErrorCodes::InternalError,
str::stream() << "Could not create new '" << name
<< "' element from existing element '"
<< val.getFieldName()
<< "' of type "
<< typeName(val.getType()));
return addToSets(elemToSet);
}
Status LogBuilder::addToSetsWithNewFieldName(StringData name, const BSONElement& val) {
mutablebson::Element elemToSet = _logRoot.getDocument().makeElementWithNewFieldName(name, val);
if (!elemToSet.ok())
return Status(ErrorCodes::InternalError,
str::stream() << "Could not create new '" << name
<< "' element from existing element '"
<< val.fieldName()
<< "' of type "
<< typeName(val.type()));
return addToSets(elemToSet);
}
Status LogBuilder::addToSets(StringData name, const SafeNum& val) {
mutablebson::Element elemToSet = _logRoot.getDocument().makeElementSafeNum(name, val);
if (!elemToSet.ok())
return Status(ErrorCodes::InternalError,
str::stream() << "Could not create new '" << name << "' SafeNum from "
<< val.debugString());
return addToSets(elemToSet);
}
Status LogBuilder::addToUnsets(StringData path) {
mutablebson::Element logElement = _logRoot.getDocument().makeElementBool(path, true);
if (!logElement.ok())
return Status(ErrorCodes::InternalError,
str::stream() << "Cannot create $unset oplog entry for path" << path);
return addToSection(logElement, &_unsetAccumulator, kUnset);
}
Status LogBuilder::setUpdateSemantics(UpdateSemantics updateSemantics) {
if (hasObjectReplacement()) {
return Status(ErrorCodes::IllegalOperation,
"LogBuilder: Invalid attempt to add a $v entry to a log with an existing "
"object replacement");
}
if (_updateSemantics.ok()) {
return Status(ErrorCodes::IllegalOperation, "LogBuilder: Invalid attempt to set $v twice.");
}
mutablebson::Document& doc = _logRoot.getDocument();
_updateSemantics =
doc.makeElementInt(kUpdateSemanticsFieldName, static_cast<int>(updateSemantics));
dassert(_logRoot[kUpdateSemanticsFieldName] == doc.end());
return _logRoot.pushFront(_updateSemantics);
}
Status LogBuilder::getReplacementObject(Element* outElt) {
// If the replacement accumulator is not ok, we must have started a $set or $unset
// already, so an object replacement is not permitted.
if (!_objectReplacementAccumulator.ok()) {
dassert(_setAccumulator.ok() || _unsetAccumulator.ok());
return Status(ErrorCodes::IllegalOperation,
"LogBuilder: Invalid attempt to obtain the object replacement slot "
"for a log containing $set or $unset entries");
}
if (hasObjectReplacement())
return Status(ErrorCodes::IllegalOperation,
"LogBuilder: Invalid attempt to acquire the replacement object "
"in a log with existing object replacement data");
if (_updateSemantics.ok()) {
return Status(ErrorCodes::IllegalOperation,
"LogBuilder: Invalid attempt to acquire the replacement object in a log with "
"an update semantics value");
}
// OK to enqueue object replacement items.
*outElt = _objectReplacementAccumulator;
return Status::OK();
}
inline bool LogBuilder::hasObjectReplacement() const {
if (!_objectReplacementAccumulator.ok())
return false;
dassert(!_setAccumulator.ok());
dassert(!_unsetAccumulator.ok());
return _objectReplacementAccumulator.hasChildren();
}
} // namespace mongo
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