mirror of
https://github.com/gabime/spdlog.git
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143 lines
4.0 KiB
C++
143 lines
4.0 KiB
C++
/*************************************************************************/
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/* spdlog - an extremely fast and easy to use c++11 logging library. */
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/* Copyright (c) 2014 Gabi Melman. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#pragma once
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// Helper class for file sink
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// When failing to open a file, retry several times(5) with small delay between the tries(10 ms)
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// Flush to file every X writes (or never if X==0)
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// Throw spdlog_ex exception on errors
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#include <cstdio>
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#include <string>
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#include <thread>
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#include <chrono>
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#include "os.h"
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namespace spdlog
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{
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namespace details
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{
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class file_helper
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{
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public:
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const int open_tries = 5;
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const int open_interval = 10;
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explicit file_helper(const std::size_t flush_inverval):
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_fd(nullptr),
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_flush_inverval(flush_inverval),
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_flush_countdown(flush_inverval) {};
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file_helper(const file_helper&) = delete;
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file_helper& operator=(const file_helper&) = delete;
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~file_helper()
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{
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close();
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}
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void open(const std::string& fname)
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{
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close();
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_filename = fname;
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for (int tries = 0; tries < open_tries; ++tries)
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{
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if(!os::fopen_s(&_fd, fname, "wb"))
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return;
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std::this_thread::sleep_for(std::chrono::milliseconds(open_interval));
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}
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throw spdlog_ex("Failed opening file " + fname + " for writing");
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}
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void reopen()
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{
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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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open(_filename);
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}
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void close()
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{
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if (_fd)
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{
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std::fclose(_fd);
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_fd = nullptr;
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}
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}
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void write(const log_msg& msg)
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{
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auto& buf = msg.formatted.buf();
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size_t size = buf.size();
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if(std::fwrite(buf.data(), sizeof(char), size, _fd) != size)
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throw spdlog_ex("Failed writing to file " + _filename);
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if(--_flush_countdown == 0)
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{
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std::fflush(_fd);
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_flush_countdown = _flush_inverval;
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}
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}
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const std::string& filename() const
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{
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return _filename;
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}
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static bool file_exists(const std::string& name)
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{
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FILE* file;
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if (!os::fopen_s(&file, name.c_str(), "r"))
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{
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fclose(file);
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return true;
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}
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else
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{
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return false;
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}
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}
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private:
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FILE* _fd;
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std::string _filename;
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const std::size_t _flush_inverval;
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std::size_t _flush_countdown;
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};
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}
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}
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