logger.cpp

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// Logs all output to a log file for the run
// Author: Max Schwarz <max.schwarz@uni-bonn.de>

#include "logger.h"

#include <cerrno>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <stdexcept>

#include <sys/time.h>

#include <fmt/format.h>

namespace rosmon
{

Logger::Logger(const std::string& path, bool flush)
 : m_flush(flush)
{
        m_file = fopen(path.c_str(), "we");
        if(!m_file)
        {
                throw std::runtime_error(fmt::format(
                        "Could not open log file: {}", strerror(errno)
                ));
        }
}

Logger::~Logger()
{
        if(m_file)
                fclose(m_file);
}

void Logger::log(const std::string& source, const std::string& msg)
{
        struct timeval tv;
        memset(&tv, 0, sizeof(tv));
        gettimeofday(&tv, nullptr);

        struct tm btime;
        memset(&btime, 0, sizeof(tv));
        localtime_r(&tv.tv_sec, &btime);

        char timeString[100];
        strftime(timeString, sizeof(timeString), "%a %F %T", &btime);

        unsigned int len = msg.length();
        while(len != 0 && (msg[len-1] == '\n' || msg[len-1] == '\r'))
                len--;

        fmt::print(m_file, "{}.{:03d}: {:>20}: ",
                timeString, tv.tv_usec / 1000,
                source.c_str()
        );
        fwrite(msg.c_str(), 1, len, m_file);
        fputc('\n', m_file);

        if(m_flush)
                fflush(m_file);
}

}