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#pragma once
#include <string>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <sstream>
#include "settings.h"
using namespace std;
namespace crow
{
enum class LogLevel
{
DEBUG,
INFO,
WARNING,
ERROR,
CRITICAL,
};
class ILogHandler {
public:
virtual void log(string message, LogLevel level) = 0;
};
class CerrLogHandler : public ILogHandler {
public:
void log(string message, LogLevel level) override {
cerr << message;
}
};
class logger {
private:
//
static string timestamp()
{
char date[32];
time_t t = time(0);
strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S", gmtime(&t));
return string(date);
}
public:
logger(string prefix, LogLevel level) : level_(level) {
#ifdef CROW_ENABLE_LOGGING
stringstream_ << "(" << timestamp() << ") [" << prefix << "] ";
#endif
}
~logger() {
#ifdef CROW_ENABLE_LOGGING
if(level_ >= get_current_log_level()) {
stringstream_ << endl;
get_handler_ref()->log(stringstream_.str(), level_);
}
#endif
}
//
template <typename T>
logger& operator<<(T const &value) {
#ifdef CROW_ENABLE_LOGGING
if(level_ >= get_current_log_level()) {
stringstream_ << value;
}
#endif
return *this;
}
//
static void setLogLevel(LogLevel level) {
get_log_level_ref() = level;
}
static void setHandler(ILogHandler* handler) {
get_handler_ref() = handler;
}
static LogLevel get_current_log_level() {
return get_log_level_ref();
}
private:
//
static LogLevel& get_log_level_ref()
{
static LogLevel current_level = (LogLevel)CROW_LOG_LEVEL;
return current_level;
}
static ILogHandler*& get_handler_ref()
{
static CerrLogHandler default_handler;
static ILogHandler* current_handler = &default_handler;
return current_handler;
}
//
ostringstream stringstream_;
LogLevel level_;
};
}
#define CROW_LOG_CRITICAL \
if (crow::logger::get_current_log_level() <= crow::LogLevel::CRITICAL) \
crow::logger("CRITICAL", crow::LogLevel::CRITICAL)
#define CROW_LOG_ERROR \
if (crow::logger::get_current_log_level() <= crow::LogLevel::ERROR) \
crow::logger("ERROR ", crow::LogLevel::ERROR)
#define CROW_LOG_WARNING \
if (crow::logger::get_current_log_level() <= crow::LogLevel::WARNING) \
crow::logger("WARNING ", crow::LogLevel::WARNING)
#define CROW_LOG_INFO \
if (crow::logger::get_current_log_level() <= crow::LogLevel::INFO) \
crow::logger("INFO ", crow::LogLevel::INFO)
#define CROW_LOG_DEBUG \
if (crow::logger::get_current_log_level() <= crow::LogLevel::DEBUG) \
crow::logger("DEBUG ", crow::LogLevel::DEBUG)
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