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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 "mongo/db/query/plan_cache_size_parameter.h"
#include <pcrecpp.h>
#include "mongo/db/client.h"
#include "mongo/db/query/query_knobs_gen.h"
namespace mongo::plan_cache_util {
StatusWith<PlanCacheSizeUnits> parseUnitString(const std::string& strUnit) {
if (strUnit.empty()) {
return Status(ErrorCodes::Error{6007010}, "Unit value cannot be empty");
}
if (strUnit[0] == '%') {
return PlanCacheSizeUnits::kPercent;
} else if (strUnit[0] == 'M' || strUnit[0] == 'm') {
return PlanCacheSizeUnits::kMB;
} else if (strUnit[0] == 'G' || strUnit[0] == 'g') {
return PlanCacheSizeUnits::kGB;
}
return Status(ErrorCodes::Error{6007011}, "Incorrect unit value");
}
StatusWith<PlanCacheSizeParameter> PlanCacheSizeParameter::parse(const std::string& str) {
pcrecpp::RE_Options opt;
opt.set_caseless(true);
// Looks for a floating point number with followed by a unit suffix (MB, GB, %).
pcrecpp::RE re("\\s*(\\d+\\.?\\d*)\\s*(MB|GB|%)\\s*", opt);
double size{};
std::string strUnit{};
if (!re.FullMatch(str, &size, &strUnit)) {
return {ErrorCodes::Error{6007012}, "Unable to parse plan cache size string"};
}
auto statusWithUnit = parseUnitString(strUnit);
if (!statusWithUnit.isOK()) {
return statusWithUnit.getStatus();
}
return PlanCacheSizeParameter{size, statusWithUnit.getValue()};
}
Status onPlanCacheSizeUpdate(const std::string& str) {
auto newSize = PlanCacheSizeParameter::parse(str);
if (!newSize.isOK()) {
return newSize.getStatus();
}
// The client is nullptr if the parameter is supplied from the command line. In this case, we
// ignore the update event, the parameter will be processed when initializing the service
// context.
if (auto client = Client::getCurrent()) {
auto serviceCtx = client->getServiceContext();
tassert(6007013, "ServiceContext must be non null", serviceCtx);
auto updater = sbePlanCacheSizeUpdaterDecoration(serviceCtx).get();
tassert(6007014, "Plan cache size updater must be non null", serviceCtx);
updater->update(serviceCtx, newSize.getValue());
}
return Status::OK();
}
const Decorable<ServiceContext>::Decoration<std::unique_ptr<PlanCacheSizeUpdater>>
sbePlanCacheSizeUpdaterDecoration =
ServiceContext::declareDecoration<std::unique_ptr<PlanCacheSizeUpdater>>();
} // namespace mongo::plan_cache_util
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