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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.
*/
#include <string>
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/server_parameter.h"
namespace mongo {
/**
* Test-only class that sets a server parameter to the specified value and allows
* resetting after the test completes.
*/
class ServerParameterControllerForTest {
public:
/**
* Constructor setting the server parameter to the specified value.
*/
template <typename T>
ServerParameterControllerForTest(const std::string& name, T value)
: _serverParam(ServerParameterSet::getNodeParameterSet()->get(name)) {
// Save the old value.
BSONObjBuilder bob;
_serverParam->appendSupportingRoundtrip(nullptr, &bob, name, boost::none);
_oldValue = bob.obj();
// Set server param to the new value.
uassertStatusOK(_serverParam->set(BSON(name << value).firstElement(), boost::none));
}
void reset() {
// Reset to the old value.
auto elem = _oldValue.firstElement();
uassertStatusOK(_serverParam->set(elem, boost::none));
}
private:
ServerParameter* _serverParam;
BSONObj _oldValue;
};
/**
* Test-only RAII type that wraps ServerParameterControllerForTest. Upon destruction, the server
* parameter will be set to its original value.
*/
class RAIIServerParameterControllerForTest {
public:
/**
* Constructor setting the server parameter to the specified value.
*/
template <typename T>
RAIIServerParameterControllerForTest(const std::string& name, T value)
: _serverParamController(ServerParameterControllerForTest(name, value)) {}
/**
* Destructor resetting the server parameter to the original value.
*/
~RAIIServerParameterControllerForTest() {
_serverParamController.reset();
}
private:
ServerParameterControllerForTest _serverParamController;
};
} // namespace mongo
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