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/**
* Copyright (C) 2020-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.
*/
#pragma once
#include "mongo/db/api_parameters.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/mutex.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/util/time_support.h"
#include <ctime>
namespace mongo {
/**
* A service context decoration that stores metrics related to the API version used by applications.
*/
class APIVersionMetrics {
public:
// To ensure that the BSONObject doesn't exceed the size limit, the 'appName' field has a limit
// of 128 bytes, which results in an output of approximately 128KB for app names.
static constexpr int KMaxNumOfOutputAppNames = 1000;
// To prevent unbounded memory usage, we limit the size of the saved app name to approximately
// 384KB, as it is stored for 24 hours.
static constexpr int KMaxNumOfSavedAppNames = KMaxNumOfOutputAppNames * 3;
using APIVersionMetricsMap =
stdx::unordered_map<std::string, stdx::unordered_map<std::string, Date_t>>;
static APIVersionMetrics& get(ServiceContext* svc);
APIVersionMetrics() = default;
// Update the timestamp for the API version used by the application.
void update(const std::string& appName, const APIParameters& apiParams);
void appendAPIVersionMetricsInfo(BSONObjBuilder* b);
APIVersionMetricsMap getAPIVersionMetrics_forTest();
void appendAPIVersionMetricsInfo_forTest(BSONObjBuilder* b);
class APIVersionMetricsSSM;
private:
void _removeStaleTimestamps(WithLock lk, Date_t now);
void _appendAPIVersionData(BSONObjBuilder* b);
mutable Mutex _mutex = MONGO_MAKE_LATCH("APIVersionMetrics::_mutex");
// Map of maps for API version metrics. For every application, for each API version, we store
// the most recent timestamp that a command was invoked with that API version.
APIVersionMetricsMap _apiVersionMetrics;
};
} // namespace mongo
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