145 lines
4.8 KiB
C++
145 lines
4.8 KiB
C++
// 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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#ifndef SPDLOG_HEADER_ONLY
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#include <spdlog/sinks/rotating_file_sink.h>
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#endif
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#include <spdlog/common.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/fmt/fmt.h>
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#include <cerrno>
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#include <chrono>
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#include <ctime>
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#include <mutex>
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#include <string>
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#include <tuple>
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namespace spdlog {
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namespace sinks {
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template <typename Mutex>
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SPDLOG_INLINE rotating_file_sink<Mutex>::rotating_file_sink(
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filename_t base_filename,
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std::size_t max_size,
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std::size_t max_files,
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bool rotate_on_open,
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const file_event_handlers &event_handlers)
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: base_filename_(std::move(base_filename)),
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max_size_(max_size),
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max_files_(max_files),
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file_helper_{event_handlers} {
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if (max_size == 0) {
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throw_spdlog_ex("rotating sink constructor: max_size arg cannot be zero");
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}
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if (max_files > 200000) {
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throw_spdlog_ex("rotating sink constructor: max_files arg cannot exceed 200000");
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}
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file_helper_.open(calc_filename(base_filename_, 0));
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current_size_ = file_helper_.size(); // expensive. called only once
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if (rotate_on_open && current_size_ > 0) {
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rotate_();
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current_size_ = 0;
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}
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}
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// calc filename according to index and file extension if exists.
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// e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
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template <typename Mutex>
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SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::calc_filename(const filename_t &filename,
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std::size_t index) {
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if (index == 0u) {
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return filename;
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}
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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("{}.{}{}"), basename, index, ext);
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}
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template <typename Mutex>
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SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::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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template <typename Mutex>
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SPDLOG_INLINE void rotating_file_sink<Mutex>::sink_it_(const details::log_msg &msg) {
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memory_buf_t formatted;
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base_sink<Mutex>::formatter_->format(msg, formatted);
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auto new_size = current_size_ + formatted.size();
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// rotate if the new estimated file size exceeds max size.
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// rotate only if the real size > 0 to better deal with full disk (see issue #2261).
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// we only check the real size when new_size > max_size_ because it is relatively expensive.
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if (new_size > max_size_) {
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file_helper_.flush();
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if (file_helper_.size() > 0) {
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rotate_();
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new_size = formatted.size();
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}
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}
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file_helper_.write(formatted);
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current_size_ = new_size;
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}
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template <typename Mutex>
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SPDLOG_INLINE void rotating_file_sink<Mutex>::flush_() {
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file_helper_.flush();
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}
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// Rotate files:
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// log.txt -> log.1.txt
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// log.1.txt -> log.2.txt
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// log.2.txt -> log.3.txt
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// log.3.txt -> delete
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template <typename Mutex>
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SPDLOG_INLINE void rotating_file_sink<Mutex>::rotate_() {
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using details::os::filename_to_str;
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using details::os::path_exists;
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file_helper_.close();
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for (auto i = max_files_; i > 0; --i) {
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filename_t src = calc_filename(base_filename_, i - 1);
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if (!path_exists(src)) {
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continue;
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}
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filename_t target = calc_filename(base_filename_, i);
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if (!rename_file_(src, target)) {
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// if failed try again after a small delay.
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// this is a workaround to a windows issue, where very high rotation
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// rates can cause the rename to fail with permission denied (because of antivirus?).
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details::os::sleep_for_millis(100);
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if (!rename_file_(src, target)) {
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file_helper_.reopen(
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true); // truncate the log file anyway to prevent it to grow beyond its limit!
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current_size_ = 0;
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throw_spdlog_ex("rotating_file_sink: failed renaming " + filename_to_str(src) +
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" to " + filename_to_str(target),
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errno);
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}
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}
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}
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file_helper_.reopen(true);
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}
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// delete the target if exists, and rename the src file to target
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// return true on success, false otherwise.
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template <typename Mutex>
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SPDLOG_INLINE bool rotating_file_sink<Mutex>::rename_file_(const filename_t &src_filename,
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const filename_t &target_filename) {
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// try to delete the target file in case it already exists.
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(void)details::os::remove(target_filename);
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return details::os::rename(src_filename, target_filename) == 0;
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}
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} // namespace sinks
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} // namespace spdlog
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