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Add support for custom filename calculator in rotating_file_sink.

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This commit is contained in:
Tamas Florin
2020-06-04 13:38:21 +03:00
parent 22a169bc31
commit 071206ef59
6 changed files with 169 additions and 169 deletions
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131
include/spdlog/sinks/rotating_file_sink-inl.h
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@@ -1,131 +0,0 @@
// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
#pragma once
#ifndef SPDLOG_HEADER_ONLY
#include <spdlog/sinks/rotating_file_sink.h>
#endif
#include <spdlog/common.h>
#include <spdlog/details/file_helper.h>
#include <spdlog/details/null_mutex.h>
#include <spdlog/fmt/fmt.h>
#include <cerrno>
#include <chrono>
#include <ctime>
#include <mutex>
#include <string>
#include <tuple>
namespace spdlog {
namespace sinks {
template<typename Mutex>
SPDLOG_INLINE rotating_file_sink<Mutex>::rotating_file_sink(
filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open)
: base_filename_(std::move(base_filename))
, max_size_(max_size)
, max_files_(max_files)
{
file_helper_.open(calc_filename(base_filename_, 0));
current_size_ = file_helper_.size(); // expensive. called only once
if (rotate_on_open && current_size_ > 0)
{
rotate_();
}
}
// calc filename according to index and file extension if exists.
// e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
template<typename Mutex>
SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::calc_filename(const filename_t &filename, std::size_t index)
{
if (index == 0u)
{
return filename;
}
filename_t basename, ext;
std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
return fmt::format(SPDLOG_FILENAME_T("{}.{}{}"), basename, index, ext);
}
template<typename Mutex>
SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::filename()
{
std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
return file_helper_.filename();
}
template<typename Mutex>
SPDLOG_INLINE void rotating_file_sink<Mutex>::sink_it_(const details::log_msg &msg)
{
memory_buf_t formatted;
base_sink<Mutex>::formatter_->format(msg, formatted);
current_size_ += formatted.size();
if (current_size_ > max_size_)
{
rotate_();
current_size_ = formatted.size();
}
file_helper_.write(formatted);
}
template<typename Mutex>
SPDLOG_INLINE void rotating_file_sink<Mutex>::flush_()
{
file_helper_.flush();
}
// Rotate files:
// log.txt -> log.1.txt
// log.1.txt -> log.2.txt
// log.2.txt -> log.3.txt
// log.3.txt -> delete
template<typename Mutex>
SPDLOG_INLINE void rotating_file_sink<Mutex>::rotate_()
{
using details::os::filename_to_str;
using details::os::path_exists;
file_helper_.close();
for (auto i = max_files_; i > 0; --i)
{
filename_t src = calc_filename(base_filename_, i - 1);
if (!path_exists(src))
{
continue;
}
filename_t target = calc_filename(base_filename_, i);
if (!rename_file_(src, target))
{
// if failed try again after a small delay.
// this is a workaround to a windows issue, where very high rotation
// rates can cause the rename to fail with permission denied (because of antivirus?).
details::os::sleep_for_millis(100);
if (!rename_file_(src, target))
{
file_helper_.reopen(true); // truncate the log file anyway to prevent it to grow beyond its limit!
current_size_ = 0;
throw_spdlog_ex("rotating_file_sink: failed renaming " + filename_to_str(src) + " to " + filename_to_str(target), errno);
}
}
}
file_helper_.reopen(true);
}
// delete the target if exists, and rename the src file to target
// return true on success, false otherwise.
template<typename Mutex>
SPDLOG_INLINE bool rotating_file_sink<Mutex>::rename_file_(const filename_t &src_filename, const filename_t &target_filename)
{
// try to delete the target file in case it already exists.
(void)details::os::remove(target_filename);
return details::os::rename(src_filename, target_filename) == 0;
}
} // namespace sinks
} // namespace spdlog

103
include/spdlog/sinks/rotating_file_sink.h
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@@ -15,20 +15,68 @@
namespace spdlog {
namespace sinks {
/*
* Generator of rotating log file names in format basename.index.extension
* e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
*/
struct rotating_filename_calculator
{
// Create filename for the form basename.index.extension
static filename_t calc_filename(const filename_t &filename, std::size_t index)
{
if (index == 0u)
{
return filename;
}
filename_t basename, ext;
std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
return fmt::format(SPDLOG_FILENAME_T("{}.{}{}"), basename, index, ext);
}
};
//
// Rotating file sink based on size
//
template<typename Mutex>
template<typename Mutex, typename FileNameCalc = rotating_filename_calculator>
class rotating_file_sink final : public base_sink<Mutex>
{
public:
rotating_file_sink(filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open = false);
static filename_t calc_filename(const filename_t &filename, std::size_t index);
filename_t filename();
rotating_file_sink(filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open = false)
: base_filename_(std::move(base_filename))
, max_size_(max_size)
, max_files_(max_files)
{
file_helper_.open(FileNameCalc::calc_filename(base_filename_, 0));
current_size_ = file_helper_.size(); // expensive. called only once
if (rotate_on_open && current_size_ > 0)
{
rotate_();
}
}
filename_t filename()
{
std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
return file_helper_.filename();
}
protected:
void sink_it_(const details::log_msg &msg) override;
void flush_() override;
void sink_it_(const details::log_msg &msg) override
{
memory_buf_t formatted;
base_sink<Mutex>::formatter_->format(msg, formatted);
current_size_ += formatted.size();
if (current_size_ > max_size_)
{
rotate_();
current_size_ = formatted.size();
}
file_helper_.write(formatted);
}
void flush_() override
{
file_helper_.flush();
}
private:
// Rotate files:
@@ -36,11 +84,45 @@ private:
// log.1.txt -> log.2.txt
// log.2.txt -> log.3.txt
// log.3.txt -> delete
void rotate_();
void rotate_()
{
using details::os::filename_to_str;
using details::os::path_exists;
file_helper_.close();
for (auto i = max_files_; i > 0; --i)
{
filename_t src = FileNameCalc::calc_filename(base_filename_, i - 1);
if (!path_exists(src))
{
continue;
}
filename_t target = FileNameCalc::calc_filename(base_filename_, i);
if (!rename_file_(src, target))
{
// if failed try again after a small delay.
// this is a workaround to a windows issue, where very high rotation
// rates can cause the rename to fail with permission denied (because of antivirus?).
details::os::sleep_for_millis(100);
if (!rename_file_(src, target))
{
file_helper_.reopen(true); // truncate the log file anyway to prevent it to grow beyond its limit!
current_size_ = 0;
throw_spdlog_ex("rotating_file_sink: failed renaming " + filename_to_str(src) + " to " + filename_to_str(target), errno);
}
}
}
file_helper_.reopen(true);
}
// delete the target if exists, and rename the src file to target
// return true on success, false otherwise.
bool rename_file_(const filename_t &src_filename, const filename_t &target_filename);
bool rename_file_(const filename_t &src_filename, const filename_t &target_filename)
{
// try to delete the target file in case it already exists.
(void)details::os::remove(target_filename);
return details::os::rename(src_filename, target_filename) == 0;
}
filename_t base_filename_;
std::size_t max_size_;
@@ -49,6 +131,7 @@ private:
details::file_helper file_helper_;
};
using rotating_file_sink_mt = rotating_file_sink<std::mutex>;
using rotating_file_sink_st = rotating_file_sink<details::null_mutex>;
@@ -72,7 +155,3 @@ inline std::shared_ptr<logger> rotating_logger_st(
return Factory::template create<sinks::rotating_file_sink_st>(logger_name, filename, max_file_size, max_files, rotate_on_open);
}
} // namespace spdlog
#ifdef SPDLOG_HEADER_ONLY
#include "rotating_file_sink-inl.h"
#endif