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