log.hpp

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#pragma once
 
 
#include <chrono>
#include <cstdarg>
#include <iomanip>
#include <iostream>
#include <mutex>
#include <string>
 
#ifndef UVG_LOG_LEVEL
#define UVG_LOG_LEVEL LogLevel::DEBUG
#endif
 
namespace uvgutils {
 
enum class LogLevel { FATAL, ERROR, WARNING, INFO, PROFILING, TRACE, DEBUG };
constexpr LogLevel COMPILETIME_LOG_LEVEL = UVG_LOG_LEVEL;
 
// stringify table for LogLevel
static const std::string LogLevelStr[] = {"FATAL", "ERROR", "WARNING", "INFO", "PROFILING", "TRACE", "DEBUG"};
 
constexpr bool errorsAreFatalDefaultValue = true;
constexpr LogLevel logLevelDefaultValue = LogLevel::INFO;
constexpr std::ostream* outputDefaultValue = &std::cerr;
 
class Logger {
   public:
    static void setLogLevel(const LogLevel& level);
    static void setErrorsAreFatal(const bool& isFatal);
    static void setOutputStream(std::ostream& out);
    static LogLevel getLogLevel();
    static void printLogMessage(const std::string& context, LogLevel level, const std::string& message);
 
    template <LogLevel LEVEL>
    static void log(const std::string& context, const std::string& message) {
        static std::mutex logMutex;
        const std::lock_guard<std::mutex> lock(logMutex);
        if constexpr (LEVEL <= COMPILETIME_LOG_LEVEL) {
            if (LEVEL <= Logger::getLogLevel()) {
                printLogMessage(context, LEVEL, message);
            }
        }
    }
    static std::string printfStrToStdStr(const char* fmt, ...);
    static std::string vprintfStrToStdStr(const char* fmt, va_list args);
 
   private:
    static LogLevel logLevel;
    static bool errorsAreFatal_;
    static std::ostream* outputStream_;
};
 
template <LogLevel LEVEL>
inline void log(const std::string& context, const std::string& message) {
    Logger::log<LEVEL>(context, message);
}
 
class Timer {
   public:
    Timer() : start(std::chrono::steady_clock::now()) {}
 
    // Function to get elapsed time since the start of the program
    double elapsed() const {
        return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::steady_clock::now() - start).count() / 1000000.0;
    }
    std::string elapsed_str() const {
        std::ostringstream oss;
        oss << std::fixed << std::setprecision(6) << elapsed();
        return oss.str();
    }
 
   private:
    std::chrono::time_point<std::chrono::steady_clock> start;
};
 
static Timer global_timer;
 
}  // namespace uvgutils