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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.
*/
#include "mongo/logv2/file_rotate_sink.h"
#include <boost/exception/diagnostic_information.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/iterator/filter_iterator.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/make_shared.hpp>
#include <fmt/format.h>
#include <fstream>
#include "mongo/logv2/json_formatter.h"
#include "mongo/logv2/log_detail.h"
#include "mongo/logv2/shared_access_fstream.h"
#include "mongo/util/exit_code.h"
#include "mongo/util/quick_exit.h"
#include "mongo/util/stacktrace.h"
#include "mongo/util/string_map.h"
namespace mongo::logv2 {
namespace {
using namespace fmt::literals;
#if _WIN32
using stream_t = Win32SharedAccessOfstream;
#else
using stream_t = std::ofstream;
#endif
StatusWith<boost::shared_ptr<stream_t>> openFile(const std::string& filename, bool append) {
std::ios_base::openmode mode = std::ios_base::out;
bool exists = false;
if (append) {
mode |= std::ios_base::app;
exists = boost::filesystem::exists(filename);
} else
mode |= std::ios_base::trunc;
auto file = boost::make_shared<stream_t>(filename, mode);
if (file->fail())
return Status(ErrorCodes::FileNotOpen, fmt::format("Failed to open {}", filename));
if (append && exists)
file->put('\n');
return file;
}
} // namespace
struct FileRotateSink::Impl {
Impl(LogTimestampFormat tsFormat) : timestampFormat(tsFormat) {}
StringMap<boost::shared_ptr<stream_t>> files;
LogTimestampFormat timestampFormat;
};
FileRotateSink::FileRotateSink(LogTimestampFormat timestampFormat)
: _impl(std::make_unique<Impl>(timestampFormat)) {}
FileRotateSink::~FileRotateSink() {}
Status FileRotateSink::addFile(const std::string& filename, bool append) {
auto statusWithFile = openFile(filename, append);
if (statusWithFile.isOK()) {
add_stream(statusWithFile.getValue());
_impl->files[filename] = statusWithFile.getValue();
}
return statusWithFile.getStatus().withContext("Can't initialize rotatable log file");
}
void FileRotateSink::removeFile(const std::string& filename) {
auto it = _impl->files.find(filename);
if (it != _impl->files.cend()) {
remove_stream(it->second);
_impl->files.erase(it);
}
}
Status FileRotateSink::rotate(bool rename,
StringData renameSuffix,
std::function<void(Status)> onMinorError) {
for (auto& file : _impl->files) {
const std::string& filename = file.first;
if (rename) {
std::string renameTarget = filename + renameSuffix;
auto targetExists = [&]() -> StatusWith<bool> {
try {
return boost::filesystem::exists(renameTarget);
} catch (const boost::exception&) {
return exceptionToStatus();
}
}();
if (!targetExists.isOK()) {
return Status(ErrorCodes::FileRenameFailed, targetExists.getStatus().reason())
.withContext("Cannot verify whether destination already exists: {}"_format(
renameTarget));
}
if (targetExists.getValue()) {
if (onMinorError) {
onMinorError({ErrorCodes::FileRenameFailed,
"Target already exists during log rotation. Skipping this file. "
"target={}, file={}"_format(renameTarget, filename)});
}
continue;
}
boost::system::error_code ec;
boost::filesystem::rename(filename, renameTarget, ec);
if (ec) {
if (ec == boost::system::errc::no_such_file_or_directory) {
if (onMinorError)
onMinorError(
{ErrorCodes::FileRenameFailed,
"Source file was missing during log rotation. Creating a new one. "
"file={}"_format(filename)});
} else {
return Status(ErrorCodes::FileRenameFailed,
"Failed to rename {} to {}: {}"_format(
filename, renameTarget, ec.message()));
}
}
}
auto newFile = openFile(filename, false);
if (newFile.isOK()) {
invariant(file.second);
remove_stream(file.second);
file.second->close();
file.second = newFile.getValue();
add_stream(file.second);
}
return newFile.getStatus();
}
return Status::OK();
}
void FileRotateSink::consume(const boost::log::record_view& rec,
const string_type& formatted_string) {
auto isFailed = [](const auto& file) {
return file.second->fail();
};
boost::log::sinks::text_ostream_backend::consume(rec, formatted_string);
if (std::any_of(_impl->files.begin(), _impl->files.end(), isFailed)) {
try {
auto failedBegin =
boost::make_filter_iterator(isFailed, _impl->files.begin(), _impl->files.end());
auto failedEnd =
boost::make_filter_iterator(isFailed, _impl->files.end(), _impl->files.end());
auto getFilename = [](const auto& file) -> const auto& {
return file.first;
};
auto begin = boost::make_transform_iterator(failedBegin, getFilename);
auto end = boost::make_transform_iterator(failedEnd, getFilename);
auto sequence = logv2::seqLog(begin, end);
DynamicAttributes attrs;
attrs.add("files", sequence);
fmt::memory_buffer buffer;
JSONFormatter(nullptr, _impl->timestampFormat)
.format(buffer,
LogSeverity::Severe(),
LogComponent::kControl,
Date_t::now(),
4522200,
getThreadName(),
"Writing to log file failed, aborting application",
TypeErasedAttributeStorage(attrs),
LogTag::kNone,
std::string() /* tenantID */,
LogTruncation::Disabled);
// Commented out log line below to get validation of the log id with the errorcodes
// linter LOGV2(4522200, "Writing to log file failed, aborting application");
std::cerr << StringData(buffer.data(), buffer.size()) << std::endl;
} catch (const std::exception& ex) {
std::cerr << "Caught std::exception of type " << demangleName(typeid(ex)) << ": "
<< ex.what() << std::endl;
} catch (const boost::exception& ex) {
std::cerr << "Caught boost::exception of type " << demangleName(typeid(ex)) << ": "
<< boost::diagnostic_information(ex) << std::endl;
} catch (...) {
std::cerr << "Caught unidentified exception" << std::endl;
}
printStackTrace(std::cerr);
quickExitWithoutLogging(ExitCode::fail);
}
}
} // namespace mongo::logv2
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