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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 <memory>
#include <tuple>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/db/ftdc/collector.h"
#include "mongo/db/ftdc/config.h"
#include "mongo/db/ftdc/file_writer.h"
#include "mongo/db/ftdc/util.h"
#include "mongo/db/jsobj.h"
namespace mongo {
class Client;
/**
* Manages a directory full of archive files, and an interim file.
*
* Manages file rotation, and directory size management.
*/
class FTDCFileManager {
MONGO_DISALLOW_COPYING(FTDCFileManager);
public:
~FTDCFileManager();
/**
* Creates the directory if it does not exist.
* NOTE: This must be run on a thread with a Client context, i.e., not a static initializer.
*
* Collectors are used to collect data to be stored as metadata on file rotation or system
* restart.
*
* Recovers data from the interim file as needed.
* Rotates files if needed.
*/
static StatusWith<std::unique_ptr<FTDCFileManager>> create(const FTDCConfig* config,
const boost::filesystem::path& path,
FTDCCollectorCollection* collection,
Client* client);
/**
* Rotates files
*/
Status rotate(Client* client);
/**
* Writes a sample to disk via FTDCFileWriter.
*
* Rotates files as needed.
*/
Status writeSampleAndRotateIfNeeded(Client* client, const BSONObj& sample, Date_t date);
/**
* Closes the current file manager down.
*/
Status close();
public:
/**
* Generate a new file name for the archive.
* Public for use by unit tests only.
*/
StatusWith<boost::filesystem::path> generateArchiveFileName(const boost::filesystem::path& path,
StringData suffix);
private:
FTDCFileManager(const FTDCConfig* config,
const boost::filesystem::path& path,
FTDCCollectorCollection* collection);
/**
* Gets a list of metrics files in a directory.
*/
std::vector<boost::filesystem::path> scanDirectory();
/**
* Recover the interim file.
*
* Checks if the file is non-empty, and if gets a list of documents with the original times they
* were written disk based on the _id fields.
*/
std::vector<std::tuple<FTDCBSONUtil::FTDCType, BSONObj, Date_t>> recoverInterimFile();
/**
* Removes the oldest files if the directory is over quota
*/
void trimDirectory(std::vector<boost::filesystem::path>& files);
/**
* Open a new file for writing.
*
* Steps:
* 1. Writes any recovered interim file samples into the file. These entries are written to the
* archive file with the time they were written to the interim file instead of the time this
* recovery is written.
* 2. Appends file rotation collectors upon opening the file.
*/
Status openArchiveFile(
Client* client,
const boost::filesystem::path& path,
const std::vector<std::tuple<FTDCBSONUtil::FTDCType, BSONObj, Date_t>>& docs);
private:
// config to use
const FTDCConfig* const _config;
// file to log samples to
FTDCFileWriter _writer;
// last archive file name suffix used
std::string _previousArchiveFileSuffix;
// last file name id uniquifier used
// this starts from zero for each new file suffix
std::uint32_t _fileNameUniquifier = 0;
// Path of metrics directory
boost::filesystem::path _path;
// collection of collectors to add to new files on rotation, and server restart
FTDCCollectorCollection* const _rotateCollectors;
};
} // namespace mongo
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