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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.
*/
#pragma once
#include <memory>
#include "mongo/db/signed_logical_time.h"
#include "mongo/db/time_proof_service.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class OperationContext;
class ServiceContext;
/**
* This is responsible for signing logical times that can be used to sent to other servers and
* verifying signatures of signed logical times.
*/
class LogicalTimeValidator {
public:
// Decorate ServiceContext with LogicalTimeValidator instance.
static LogicalTimeValidator* get(ServiceContext* service);
static LogicalTimeValidator* get(OperationContext* ctx);
static void set(ServiceContext* service, std::unique_ptr<LogicalTimeValidator> validator);
/**
* Returns the newTime with a valid signature.
*/
SignedLogicalTime signLogicalTime(const LogicalTime& newTime);
/**
* Returns true if the signature of newTime is valid.
*/
Status validate(const SignedLogicalTime& newTime);
/**
* Saves the newTime if it is newer than the last seen valid LogicalTime without performing
* validation.
*/
void updateCacheTrustedSource(const SignedLogicalTime& newTime);
private:
stdx::mutex _mutex;
SignedLogicalTime _lastSeenValidTime;
TimeProofService _timeProofService;
};
} // namespace mongo
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