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//
// Copyright(c) 2015 Gabi Melman.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
//
#pragma once
// Helper class for file sink
// When failing to open a file, retry several times(5) with small delay between the tries(10 ms)
// Throw spdlog_ex exception on errors
#include "../details/log_msg.h"
#include "../details/os.h"
#include <cerrno>
#include <chrono>
#include <cstdio>
#include <string>
#include <thread>
#include <tuple>
namespace spdlog {
namespace details {
class file_helper
{
public:
const int open_tries = 5;
const int open_interval = 10;
explicit file_helper() = default;
file_helper(const file_helper &) = delete;
file_helper &operator=(const file_helper &) = delete;
~file_helper()
{
close();
}
void open(const filename_t &fname, bool truncate = false)
{
close();
auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
_filename = fname;
for (int tries = 0; tries < open_tries; ++tries)
{
if (!os::fopen_s(&_fd, fname, mode))
{
return;
}
details::os::sleep_for_millis(open_interval);
}
throw spdlog_ex("Failed opening file " + os::filename_to_str(_filename) + " for writing", errno);
}
void reopen(bool truncate)
{
if (_filename.empty())
{
throw spdlog_ex("Failed re opening file - was not opened before");
}
open(_filename, truncate);
}
void flush()
{
std::fflush(_fd);
}
void close()
{
if (_fd != nullptr)
{
std::fclose(_fd);
_fd = nullptr;
}
}
void write(const log_msg &msg)
{
size_t msg_size = msg.formatted.size();
auto data = msg.formatted.data();
if (std::fwrite(data, 1, msg_size, _fd) != msg_size)
{
throw spdlog_ex("Failed writing to file " + os::filename_to_str(_filename), errno);
}
}
size_t size() const
{
if (_fd == nullptr)
{
throw spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(_filename));
}
return os::filesize(_fd);
}
const filename_t &filename() const
{
return _filename;
}
static bool file_exists(const filename_t &fname)
{
return os::file_exists(fname);
}
//
// return file path and its extension:
//
// "mylog.txt" => ("mylog", ".txt")
// "mylog" => ("mylog", "")
// "mylog." => ("mylog.", "")
// "/dir1/dir2/mylog.txt" => ("/dir1/dir2/mylog", ".txt")
//
// the starting dot in filenames is ignored (hidden files):
//
// ".mylog" => (".mylog". "")
// "my_folder/.mylog" => ("my_folder/.mylog", "")
// "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
static std::tuple<filename_t, filename_t> split_by_extenstion(const spdlog::filename_t &fname)
{
auto ext_index = fname.rfind('.');
// no valid extension found - return whole path and empty string as extension
if (ext_index == filename_t::npos || ext_index == 0 || ext_index == fname.size() - 1)
{
return std::make_tuple(fname, spdlog::filename_t());
}
// treat casese like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
auto folder_index = fname.rfind(details::os::folder_sep);
if (folder_index != fname.npos && folder_index >= ext_index - 1)
{
return std::make_tuple(fname, spdlog::filename_t());
}
// finally - return a valid base and extension tuple
return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
}
private:
FILE *_fd{nullptr};
filename_t _filename;
};
} // namespace details
} // namespace spdlog
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