libsclogging/logger.cpp

//
// logger.cpp
// libsclogging
//
// Created by Bob Polis at 2020-04-29
// Copyright (c) 2020 SwiftCoder. All rights reserved.
//

#include "logger.hpp"
#include <unistd.h>
#include <sys/time.h>
#include <ctime>
#include <cmath>
#include <iomanip>

using namespace sc;

logger::logger(const std::string& name, loglevel level)
    : _level(level), _name(name) {}

void logger::msg(loglevel level, const char* file, int line, const char* func) {
    if (level >= _level) {
        if (_topcall) {
            write_prefix(level, file, line, func);
        } else {
            _topcall = true;
        }
        std::cerr << '\n';
    }
}

void logger::write_prefix(loglevel level, const char* file, int line, const char* func) {
    // retrieve accurate time for milliseconds display
	struct timeval secs;
	(void)::gettimeofday(&secs, nullptr);
	int ms = static_cast<int>(std::roundf(secs.tv_usec / 1000.0)) % 1000;

    // create a date/time stamp
	char dtstamp[20];
	std::strftime(dtstamp, 20, "%F %T", std::localtime(&secs.tv_sec));

    std::cerr << dtstamp << "." << std::setw(3) << ms << " ";
    std::cerr << _name << "[" << ::getpid() << "] ";
    std::cerr << file << ":" << line << " " << func << "() ";
    std::cerr << '[' << loglevel_desc(level) << "] ";
}