153 lines
4.6 KiB
C++
153 lines
4.6 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/details/file_helper.h>
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#endif
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#include <spdlog/common.h>
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#include <spdlog/details/os.h>
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#include <cerrno>
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#include <chrono>
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#include <cstdio>
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#include <string>
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#include <thread>
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#include <tuple>
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namespace spdlog {
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namespace details {
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SPDLOG_INLINE file_helper::file_helper(const file_event_handlers &event_handlers)
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: event_handlers_(event_handlers) {}
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SPDLOG_INLINE file_helper::~file_helper() { close(); }
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SPDLOG_INLINE void file_helper::open(const filename_t &fname, bool truncate) {
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close();
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filename_ = fname;
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auto *mode = SPDLOG_FILENAME_T("ab");
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auto *trunc_mode = SPDLOG_FILENAME_T("wb");
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if (event_handlers_.before_open) {
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event_handlers_.before_open(filename_);
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}
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for (int tries = 0; tries < open_tries_; ++tries) {
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// create containing folder if not exists already.
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os::create_dir(os::dir_name(fname));
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if (truncate) {
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// Truncate by opening-and-closing a tmp file in "wb" mode, always
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// opening the actual log-we-write-to in "ab" mode, since that
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// interacts more politely with eternal processes that might
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// rotate/truncate the file underneath us.
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std::FILE *tmp;
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if (os::fopen_s(&tmp, fname, trunc_mode)) {
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continue;
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}
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std::fclose(tmp);
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}
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if (!os::fopen_s(&fd_, fname, mode)) {
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if (event_handlers_.after_open) {
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event_handlers_.after_open(filename_, fd_);
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}
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return;
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}
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details::os::sleep_for_millis(open_interval_);
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}
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throw_spdlog_ex("Failed opening file " + os::filename_to_str(filename_) + " for writing",
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errno);
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}
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SPDLOG_INLINE void file_helper::reopen(bool truncate) {
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if (filename_.empty()) {
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throw_spdlog_ex("Failed re opening file - was not opened before");
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}
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this->open(filename_, truncate);
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}
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SPDLOG_INLINE void file_helper::flush() {
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if (std::fflush(fd_) != 0) {
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throw_spdlog_ex("Failed flush to file " + os::filename_to_str(filename_), errno);
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}
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}
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SPDLOG_INLINE void file_helper::sync() {
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if (!os::fsync(fd_)) {
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throw_spdlog_ex("Failed to fsync file " + os::filename_to_str(filename_), errno);
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}
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}
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SPDLOG_INLINE void file_helper::close() {
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if (fd_ != nullptr) {
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if (event_handlers_.before_close) {
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event_handlers_.before_close(filename_, fd_);
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}
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std::fclose(fd_);
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fd_ = nullptr;
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if (event_handlers_.after_close) {
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event_handlers_.after_close(filename_);
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}
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}
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}
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SPDLOG_INLINE void file_helper::write(const memory_buf_t &buf) {
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if (fd_ == nullptr) return;
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size_t msg_size = buf.size();
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auto data = buf.data();
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if (std::fwrite(data, 1, msg_size, fd_) != msg_size) {
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throw_spdlog_ex("Failed writing to file " + os::filename_to_str(filename_), errno);
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}
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}
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SPDLOG_INLINE size_t file_helper::size() const {
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if (fd_ == nullptr) {
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throw_spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(filename_));
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}
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return os::filesize(fd_);
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}
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SPDLOG_INLINE const filename_t &file_helper::filename() const { return filename_; }
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//
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// return file path and its extension:
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//
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// "mylog.txt" => ("mylog", ".txt")
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// "mylog" => ("mylog", "")
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// "mylog." => ("mylog.", "")
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// "/dir1/dir2/mylog.txt" => ("/dir1/dir2/mylog", ".txt")
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//
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// the starting dot in filenames is ignored (hidden files):
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//
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// ".mylog" => (".mylog". "")
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// "my_folder/.mylog" => ("my_folder/.mylog", "")
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// "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
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SPDLOG_INLINE std::tuple<filename_t, filename_t> file_helper::split_by_extension(
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const filename_t &fname) {
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auto ext_index = fname.rfind('.');
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// no valid extension found - return whole path and empty string as
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// extension
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if (ext_index == filename_t::npos || ext_index == 0 || ext_index == fname.size() - 1) {
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return std::make_tuple(fname, filename_t());
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}
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// treat cases like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
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auto folder_index = fname.find_last_of(details::os::folder_seps_filename);
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if (folder_index != filename_t::npos && folder_index >= ext_index - 1) {
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return std::make_tuple(fname, filename_t());
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}
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// finally - return a valid base and extension tuple
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return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
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}
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} // namespace details
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} // namespace spdlog
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