91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
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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 fflog_ 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 "../common.h"
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namespace c11log
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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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static const int open_max_tries = 5;
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static const int sleep_ms_bewteen_tries = 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()
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{
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if (_fd)
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std::fclose(_fd);
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}
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void open(const std::string& filename)
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{
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if (_fd)
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std::fclose(_fd);
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_filename = filename;
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for (int tries = 0; tries < open_max_tries; ++tries)
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{
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if(!os::fopen_s(&_fd, filename, "wb"))
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return;
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std::this_thread::sleep_for(std::chrono::milliseconds(sleep_ms_bewteen_tries));
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}
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throw fflog_exception("Failed opening file " + filename + " for writing");
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}
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void close()
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{
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std::fclose(_fd);
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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 fflog_exception("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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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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