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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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kFTDC
#include "mongo/platform/basic.h"
#include "mongo/db/ftdc/file_manager.h"
#include <boost/filesystem.hpp>
#include <memory>
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/db/client.h"
#include "mongo/db/ftdc/config.h"
#include "mongo/db/ftdc/constants.h"
#include "mongo/db/ftdc/file_reader.h"
#include "mongo/db/jsobj.h"
#include "mongo/logv2/log.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
#include "mongo/util/time_support.h"
namespace mongo {
FTDCFileManager::FTDCFileManager(const FTDCConfig* config,
const boost::filesystem::path& path,
FTDCCollectorCollection* collection)
: _config(config), _writer(_config), _path(path), _rotateCollectors(collection) {}
FTDCFileManager::~FTDCFileManager() {
close().transitional_ignore();
}
StatusWith<std::unique_ptr<FTDCFileManager>> FTDCFileManager::create(
const FTDCConfig* config,
const boost::filesystem::path& path,
FTDCCollectorCollection* collection,
Client* client) {
const boost::filesystem::path dir = boost::filesystem::absolute(path);
// We don't expect to ever pass "" to create_directories below, but catch
// this anyway as per SERVER-26412.
invariant(!dir.empty());
if (!boost::filesystem::exists(dir)) {
// Create the directory
boost::system::error_code ec;
boost::filesystem::create_directories(dir, ec);
if (ec) {
return {ErrorCodes::NonExistentPath,
str::stream() << "\"" << dir.generic_string()
<< "\" could not be created: " << ec.message()};
}
}
auto mgr =
std::unique_ptr<FTDCFileManager>(new FTDCFileManager(config, dir, std::move(collection)));
// Enumerate the metrics files
auto files = mgr->scanDirectory();
// Recover the interim file
auto interimDocs = mgr->recoverInterimFile();
// Open the archive file for writing
auto swFile = mgr->generateArchiveFileName(path, terseCurrentTimeForFilename(true));
if (!swFile.isOK()) {
return swFile.getStatus();
}
Status s = mgr->openArchiveFile(client, swFile.getValue(), interimDocs);
if (!s.isOK()) {
return s;
}
// Rotate as needed after we appended interim data to the archive file
s = mgr->trimDirectory(files);
if (!s.isOK()) {
return s;
}
return {std::move(mgr)};
}
std::vector<boost::filesystem::path> FTDCFileManager::scanDirectory() {
std::vector<boost::filesystem::path> files;
boost::filesystem::directory_iterator di(_path);
for (; di != boost::filesystem::directory_iterator(); di++) {
boost::filesystem::directory_entry& de = *di;
auto filename = de.path().filename();
std::string str = filename.generic_string();
if (str.compare(0, strlen(kFTDCArchiveFile), kFTDCArchiveFile) == 0 &&
str != kFTDCInterimTempFile && str != kFTDCInterimFile) {
files.emplace_back(_path / filename);
}
}
std::sort(files.begin(), files.end());
return files;
}
StatusWith<boost::filesystem::path> FTDCFileManager::generateArchiveFileName(
const boost::filesystem::path& path, StringData suffix) {
auto fileName = path;
fileName /= std::string(kFTDCArchiveFile);
fileName += std::string(".");
fileName += suffix.toString();
if (_previousArchiveFileSuffix != suffix) {
// If the suffix has changed, reset the uniquifier counter to zero
_previousArchiveFileSuffix = suffix.toString();
_fileNameUniquifier = 0;
}
if (boost::filesystem::exists(path)) {
for (; _fileNameUniquifier < FTDCConfig::kMaxFileUniqifier; ++_fileNameUniquifier) {
char buf[20];
// Use leading zeros so the numbers sort lexigraphically
int ret = snprintf(&buf[0], sizeof(buf), "%05u", _fileNameUniquifier);
invariant(ret > 0 && ret < static_cast<int>((sizeof(buf) - 1)));
auto fileNameUnique = fileName;
fileNameUnique += std::string("-") + &buf[0];
if (!boost::filesystem::exists(fileNameUnique)) {
return fileNameUnique;
}
}
return {ErrorCodes::InvalidPath,
"Maximum limit reached for FTDC files in a second. The maximum file uniqifier has "
"been reached."};
}
return {fileName};
}
Status FTDCFileManager::openArchiveFile(
Client* client,
const boost::filesystem::path& path,
const std::vector<std::tuple<FTDCBSONUtil::FTDCType, BSONObj, Date_t>>& docs) {
auto sOpen = _writer.open(path);
if (!sOpen.isOK()) {
return sOpen;
}
// Append any old interim records
for (auto& triplet : docs) {
if (std::get<0>(triplet) == FTDCBSONUtil::FTDCType::kMetadata) {
Status s = _writer.writeMetadata(std::get<1>(triplet), std::get<2>(triplet));
if (!s.isOK()) {
return s;
}
} else {
Status s = _writer.writeSample(std::get<1>(triplet), std::get<2>(triplet));
if (!s.isOK()) {
return s;
}
}
}
// After the system restarts or a new file has been started,
// collect one-time information
// This is appened after the file is opened to ensure a user can determine which bson objects
// where collected from which server instance.
auto sample = _rotateCollectors->collect(client);
if (!std::get<0>(sample).isEmpty()) {
Status s = _writer.writeMetadata(std::get<0>(sample), std::get<1>(sample));
if (!s.isOK()) {
return s;
}
}
return Status::OK();
}
Status FTDCFileManager::trimDirectory(std::vector<boost::filesystem::path>& files) {
std::uint64_t maxSize = _config->maxDirectorySizeBytes;
std::uint64_t size = 0;
dassert(std::is_sorted(files.begin(), files.end()));
for (auto it = files.rbegin(); it != files.rend(); ++it) {
boost::system::error_code ec;
std::uint64_t fileSize = boost::filesystem::file_size(*it, ec);
if (ec) {
return {ErrorCodes::NonExistentPath,
str::stream() << "\"" << (*it).generic_string()
<< "\" file size could not be retrieved during trimming: "
<< ec.message()};
}
size += fileSize;
if (size >= maxSize) {
LOGV2_DEBUG(20628,
1,
"Cleaning file over full-time diagnostic data capture quota",
"fileName"_attr = (*it).generic_string(),
"fileSize"_attr = fileSize);
boost::filesystem::remove(*it, ec);
if (ec) {
return {ErrorCodes::NonExistentPath,
str::stream()
<< "\"" << (*it).generic_string()
<< "\" could not be removed during trimming: " << ec.message()};
}
}
}
return Status::OK();
}
std::vector<std::tuple<FTDCBSONUtil::FTDCType, BSONObj, Date_t>>
FTDCFileManager::recoverInterimFile() {
decltype(recoverInterimFile()) docs;
auto interimFile = FTDCUtil::getInterimFile(_path);
// Nothing to do if it does not exist
if (!boost::filesystem::exists(interimFile)) {
return docs;
}
boost::system::error_code ec;
size_t size = boost::filesystem::file_size(interimFile, ec);
if (ec) {
LOGV2(20629,
"Recover interim file failed as the file size could not be checked",
"errorMessage"_attr = ec.message());
return docs;
}
if (size == 0) {
return docs;
}
FTDCFileReader read;
auto s = read.open(interimFile);
if (!s.isOK()) {
LOGV2(20630,
"Unclean full-time diagnostic data capture shutdown detected, found interim file, "
"but failed to open it, some metrics may have been lost",
"error"_attr = s);
// Note: We ignore any actual errors as reading from the interim files is a best-effort
return docs;
}
StatusWith<bool> m = read.hasNext();
for (; m.isOK() && m.getValue(); m = read.hasNext()) {
auto triplet = read.next();
docs.emplace_back(std::tuple<FTDCBSONUtil::FTDCType, BSONObj, Date_t>(
std::get<0>(triplet), std::get<1>(triplet).getOwned(), std::get<2>(triplet)));
}
// Warn if the interim file was corrupt or we had an unclean shutdown
if (!m.isOK() || !docs.empty()) {
LOGV2(20631,
"Unclean full-time diagnostic data capture shutdown detected, found interim file, "
"some metrics may have been lost",
"error"_attr = m.getStatus());
}
// Note: We ignore any actual errors as reading from the interim files is a best-effort
return docs;
}
Status FTDCFileManager::rotate(Client* client) {
auto s = _writer.close();
if (!s.isOK()) {
return s;
}
auto files = scanDirectory();
// Rotate as needed
s = trimDirectory(files);
if (!s.isOK()) {
return s;
}
auto swFile = generateArchiveFileName(_path, terseCurrentTimeForFilename(true));
if (!swFile.isOK()) {
return swFile.getStatus();
}
return openArchiveFile(client, swFile.getValue(), {});
}
Status FTDCFileManager::writeSampleAndRotateIfNeeded(Client* client,
const BSONObj& sample,
Date_t date) {
Status s = _writer.writeSample(sample, date);
if (!s.isOK()) {
return s;
}
if (_writer.getSize() > _config->maxFileSizeBytes) {
return rotate(client);
}
return Status::OK();
}
Status FTDCFileManager::close() {
return _writer.close();
}
} // namespace mongo
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