daily_file_sink.h
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// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
#pragma once
#include <spdlog/common.h>
#include <spdlog/details/file_helper.h>
#include <spdlog/details/null_mutex.h>
#include <spdlog/fmt/fmt.h>
#include <spdlog/sinks/base_sink.h>
#include <spdlog/details/os.h>
#include <spdlog/details/circular_q.h>
#include <spdlog/details/synchronous_factory.h>
#include <chrono>
#include <cstdio>
#include <ctime>
#include <mutex>
#include <string>
namespace spdlog {
namespace sinks {
/*
* Generator of daily log file names in format basename.YYYY-MM-DD.ext
*/
struct daily_filename_calculator
{
// Create filename for the form basename.YYYY-MM-DD
static filename_t calc_filename(const filename_t &filename, const tm &now_tm)
{
filename_t basename, ext;
std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
return fmt::format(
SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}{}"), basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday, ext);
}
};
/*
* Rotating file sink based on date.
* If truncate != false , the created file will be truncated.
* If max_files > 0, retain only the last max_files and delete previous.
*/
template<typename Mutex, typename FileNameCalc = daily_filename_calculator>
class daily_file_sink final : public base_sink<Mutex>
{
public:
// create daily file sink which rotates on given time
daily_file_sink(filename_t base_filename, int rotation_hour, int rotation_minute, bool truncate = false, uint16_t max_files = 0)
: base_filename_(std::move(base_filename))
, rotation_h_(rotation_hour)
, rotation_m_(rotation_minute)
, truncate_(truncate)
, max_files_(max_files)
, filenames_q_()
{
if (rotation_hour < 0 || rotation_hour > 23 || rotation_minute < 0 || rotation_minute > 59)
{
throw_spdlog_ex("daily_file_sink: Invalid rotation time in ctor");
}
auto now = log_clock::now();
auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
file_helper_.open(filename, truncate_);
rotation_tp_ = next_rotation_tp_();
if (max_files_ > 0)
{
init_filenames_q_();
}
}
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
{
auto time = msg.time;
bool should_rotate = time >= rotation_tp_;
if (should_rotate)
{
auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(time));
file_helper_.open(filename, truncate_);
rotation_tp_ = next_rotation_tp_();
}
memory_buf_t formatted;
base_sink<Mutex>::formatter_->format(msg, formatted);
file_helper_.write(formatted);
// Do the cleaning only at the end because it might throw on failure.
if (should_rotate && max_files_ > 0)
{
delete_old_();
}
}
void flush_() override
{
file_helper_.flush();
}
private:
void init_filenames_q_()
{
using details::os::path_exists;
filenames_q_ = details::circular_q<filename_t>(static_cast<size_t>(max_files_));
std::vector<filename_t> filenames;
auto now = log_clock::now();
while (filenames.size() < max_files_)
{
auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
if (!path_exists(filename))
{
break;
}
filenames.emplace_back(filename);
now -= std::chrono::hours(24);
}
for (auto iter = filenames.rbegin(); iter != filenames.rend(); ++iter)
{
filenames_q_.push_back(std::move(*iter));
}
}
tm now_tm(log_clock::time_point tp)
{
time_t tnow = log_clock::to_time_t(tp);
return spdlog::details::os::localtime(tnow);
}
log_clock::time_point next_rotation_tp_()
{
auto now = log_clock::now();
tm date = now_tm(now);
date.tm_hour = rotation_h_;
date.tm_min = rotation_m_;
date.tm_sec = 0;
auto rotation_time = log_clock::from_time_t(std::mktime(&date));
if (rotation_time > now)
{
return rotation_time;
}
return {rotation_time + std::chrono::hours(24)};
}
// Delete the file N rotations ago.
// Throw spdlog_ex on failure to delete the old file.
void delete_old_()
{
using details::os::filename_to_str;
using details::os::remove_if_exists;
filename_t current_file = file_helper_.filename();
if (filenames_q_.full())
{
auto old_filename = std::move(filenames_q_.front());
filenames_q_.pop_front();
bool ok = remove_if_exists(old_filename) == 0;
if (!ok)
{
filenames_q_.push_back(std::move(current_file));
throw_spdlog_ex("Failed removing daily file " + filename_to_str(old_filename), errno);
}
}
filenames_q_.push_back(std::move(current_file));
}
filename_t base_filename_;
int rotation_h_;
int rotation_m_;
log_clock::time_point rotation_tp_;
details::file_helper file_helper_;
bool truncate_;
uint16_t max_files_;
details::circular_q<filename_t> filenames_q_;
};
using daily_file_sink_mt = daily_file_sink<std::mutex>;
using daily_file_sink_st = daily_file_sink<details::null_mutex>;
} // namespace sinks
//
// factory functions
//
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> daily_logger_mt(
const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0)
{
return Factory::template create<sinks::daily_file_sink_mt>(logger_name, filename, hour, minute, truncate, max_files);
}
template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> daily_logger_st(
const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0)
{
return Factory::template create<sinks::daily_file_sink_st>(logger_name, filename, hour, minute, truncate, max_files);
}
} // namespace spdlog