118 lines
2.4 KiB
C++
118 lines
2.4 KiB
C++
//
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// Copyright(c) 2015 Gabi Melman.
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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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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// Throw spdlog_ex exception on errors
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#include "spdlog/details/os.h"
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#include "spdlog/details/log_msg.h"
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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 <cerrno>
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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() :
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_fd(nullptr)
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{}
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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 filename_t& fname, bool truncate = false)
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{
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close();
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auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
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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, mode))
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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 " + os::filename_to_str(_filename) + " for writing", errno);
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}
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void reopen(bool truncate)
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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, truncate);
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}
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void flush()
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{
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std::fflush(_fd);
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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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size_t msg_size = msg.formatted.size();
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auto data = msg.formatted.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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size_t size()
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{
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if (!_fd)
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throw spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(_filename));
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return os::filesize(_fd);
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}
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const filename_t& 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 filename_t& name)
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{
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return os::file_exists(name);
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}
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private:
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FILE* _fd;
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filename_t _filename;
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};
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}
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}
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