// 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 Hourly log file names in format basename.YYYY-MM-DD-HH.ext */ struct hourly_filename_calculator { // Create filename for the form basename.YYYY-MM-DD-H 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}_{:02d}{}"), basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday, now_tm.tm_hour, ext); } }; /* * Rotating file sink based on time. * 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 = hourly_filename_calculator> class hourly_file_sink final : public base_sink<Mutex> { public: // create hourly file sink which rotates on given time hourly_file_sink(filename_t base_filename, bool truncate = false, uint16_t max_files = 0) : base_filename_(std::move(base_filename)) , truncate_(truncate) , max_files_(max_files) , filenames_q_() { 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(1); } 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_min = 0; 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(1)}; } // 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)); SPDLOG_THROW(spdlog_ex("Failed removing hourly file " + filename_to_str(old_filename), errno)); } } filenames_q_.push_back(std::move(current_file)); } filename_t base_filename_; 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 hourly_file_sink_mt = hourly_file_sink<std::mutex>; using hourly_file_sink_st = hourly_file_sink<details::null_mutex>; } // namespace sinks // // factory functions // template<typename Factory = spdlog::synchronous_factory> inline std::shared_ptr<logger> hourly_logger_mt( const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0) { return Factory::template create<sinks::hourly_file_sink_mt>(logger_name, filename, truncate, max_files); } template<typename Factory = spdlog::synchronous_factory> inline std::shared_ptr<logger> hourly_logger_st( const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0) { return Factory::template create<sinks::hourly_file_sink_st>(logger_name, filename, truncate, max_files); } } // namespace spdlog