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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/logical_time_validator.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
namespace mongo {
namespace {
const auto getLogicalClockValidator =
ServiceContext::declareDecoration<std::unique_ptr<LogicalTimeValidator>>();
stdx::mutex validatorMutex;
// TODO: SERVER-28127 Implement KeysCollectionManager
// Remove _tempKey and its uses from logical clock, and pass actual key from key manager.
TimeProofService::Key tempKey = {};
}
LogicalTimeValidator* LogicalTimeValidator::get(ServiceContext* service) {
stdx::lock_guard<stdx::mutex> lk(validatorMutex);
return getLogicalClockValidator(service).get();
}
LogicalTimeValidator* LogicalTimeValidator::get(OperationContext* ctx) {
return get(ctx->getClient()->getServiceContext());
}
void LogicalTimeValidator::set(ServiceContext* service,
std::unique_ptr<LogicalTimeValidator> newValidator) {
stdx::lock_guard<stdx::mutex> lk(validatorMutex);
auto& validator = getLogicalClockValidator(service);
validator = std::move(newValidator);
}
SignedLogicalTime LogicalTimeValidator::signLogicalTime(const LogicalTime& newTime) {
// Compare and calculate HMAC inside mutex to prevent multiple threads computing HMAC for the
// same logical time.
stdx::lock_guard<stdx::mutex> lk(_mutex);
if (newTime == _lastSeenValidTime.getTime()) {
return _lastSeenValidTime;
}
auto signature = _timeProofService.getProof(newTime, tempKey);
SignedLogicalTime newSignedTime(newTime, std::move(signature), 0);
if (newTime > _lastSeenValidTime.getTime()) {
_lastSeenValidTime = newSignedTime;
}
return newSignedTime;
}
Status LogicalTimeValidator::validate(const SignedLogicalTime& newTime) {
{
stdx::lock_guard<stdx::mutex> lk(_mutex);
if (newTime.getTime() == _lastSeenValidTime.getTime()) {
return Status::OK();
}
}
const auto newProof = newTime.getProof();
// Logical time is only sent if a server's clock can verify and sign logical times, so any
// received logical times should have proofs.
invariant(newProof);
auto res = _timeProofService.checkProof(newTime.getTime(), newProof.get(), tempKey);
if (res != Status::OK()) {
return res;
}
return Status::OK();
}
void LogicalTimeValidator::updateCacheTrustedSource(const SignedLogicalTime& newTime) {
stdx::lock_guard<stdx::mutex> lk(_mutex);
if (newTime.getTime() > _lastSeenValidTime.getTime()) {
_lastSeenValidTime = newTime;
}
}
} // namespace mongo
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