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/**
* Copyright (C) 2018-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 <boost/filesystem/path.hpp>
#include <cstdint>
#include <memory>
#include "mongo/base/disallow_copying.h"
#include "mongo/db/ftdc/collector.h"
#include "mongo/db/ftdc/config.h"
#include "mongo/db/ftdc/file_manager.h"
#include "mongo/db/jsobj.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/stdx/thread.h"
namespace mongo {
class ServiceContext;
/**
* Responsible for periodic collection of samples, writing them to disk,
* and rotation.
*
* Exposes an methods to response to configuration changes in a thread-safe manner.
*/
class FTDCController {
MONGO_DISALLOW_COPYING(FTDCController);
public:
FTDCController(const boost::filesystem::path path, FTDCConfig config)
: _path(path), _config(std::move(config)), _configTemp(_config) {}
~FTDCController() = default;
/*
* Set whether the controller is enabled, and collects data.
*
* Returns ErrorCodes::FTDCPathNotSet if no log path has been specified for FTDC. This occurs
* in MongoS in some situations since MongoS is not required to have a storage directory like
* MongoD does.
*/
Status setEnabled(bool enabled);
/**
* Set the period for data collection.
*/
void setPeriod(Milliseconds millis);
/**
* Set the maximum directory size in bytes.
*/
void setMaxDirectorySizeBytes(std::uint64_t size);
/**
* Set the maximum file size in bytes.
*/
void setMaxFileSizeBytes(std::uint64_t size);
/**
* Set the maximum number of samples to store in a metric chunk. Larger numbers enable better
* compression at the cost of allowing more data to be lost in the event of a crash.
*/
void setMaxSamplesPerArchiveMetricChunk(size_t size);
/**
* Set the maximum number of samples to store in a interim chunk to minimize the number of
* samples not stored in the archive log in the event of a crash.
*
* Smaller numbers will create unnecessary I/O.
*/
void setMaxSamplesPerInterimMetricChunk(size_t size);
/*
* Set the path to store FTDC files if not already set.
*
* Returns ErrorCodes::FTDCPathAlreadySet if the path has already been set.
*/
Status setDirectory(const boost::filesystem::path& path);
/**
* Add a metric collector to collect periodically. i.e., serverStatus
*/
void addPeriodicCollector(std::unique_ptr<FTDCCollectorInterface> collector);
/**
* Add a collector to collect on server start, and file rotation. i.e. hostInfo
*
* This is for machine configuration settings, not metrics.
*/
void addOnRotateCollector(std::unique_ptr<FTDCCollectorInterface> collector);
/**
* Start the controller.
*
* Spawns a new thread.
*/
void start();
/**
* Stop the controller.
*
* Does not require start to be called to support early exit by mongod.
*/
void stop();
/**
* Get the FTDCController from ServiceContext.
*/
static FTDCController* get(ServiceContext* serviceContext);
/**
* Get a reference to most recent document from the periodic collectors.
*/
BSONObj getMostRecentPeriodicDocument();
private:
/**
* Do periodic statistics collection, and all other work on the background thread.
*/
void doLoop();
private:
/**
* Private enum to track state.
*
* +-----------------------------------------------------------+
* | v
* +-------------+ +----------+ +----------------+ +-------+
* | kNotStarted | --> | kStarted | --> | kStopRequested | --> | kDone |
* +-------------+ +----------+ +----------------+ +-------+
*/
enum class State {
/**
* Initial state. Either start() or stop() can be called next.
*/
kNotStarted,
/**
* start() has been called. stop() should be called next.
*/
kStarted,
/**
* stop() has been called, and the background thread is in progress of shutting down
*/
kStopRequested,
/**
* Controller has been stopped.
*/
kDone,
};
// state
State _state{State::kNotStarted};
// Directory to store files
boost::filesystem::path _path;
// Mutex to protect the condvar, configuration changes, and most recent periodic document.
stdx::mutex _mutex;
stdx::condition_variable _condvar;
// Config settings that are used by controller, file manager, and all other classes.
// Copied from _configTemp periodically to get a consistent snapshot.
FTDCConfig _config;
// Config settings that are manipulated by setters via setParameter.
FTDCConfig _configTemp;
// Set of periodic collectors
FTDCCollectorCollection _periodicCollectors;
// Last seen sample document from periodic collectors
// Owned
BSONObj _mostRecentPeriodicDocument;
// Set of file rotation collectors
FTDCCollectorCollection _rotateCollectors;
// File manager that manages file rotation, and logging
std::unique_ptr<FTDCFileManager> _mgr;
// Background collection and writing thread
stdx::thread _thread;
};
} // namespace mongo
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