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// Taken from here: http://www.drdobbs.com/cpp/logging-in-c/201804215
// Original author: Petru Marginean <petru.marginean@gmail.com>
// Modified by: Czarek Tomczak <czarek.tomczak@gmail.com>
// Usage:
// LOG_DEBUG << "Browser: someVar = " << someVar;
// Warning:
// Log is written when ~Log() destructor is called, which
// occurs when outside of scope. This could result in log
// not being written if program crashes before code goes
// outside of current scope. You could embrace LOG_DEBUG
// statements with braces {} to guarantee the log to be
// written immediately.
#ifndef __LOG_H__
#define __LOG_H__
#include <sstream>
#include <string>
#include <stdio.h>
#include "DebugLog.h"
inline std::string NowTime();
enum TLogLevel {logERROR, logWARNING, logINFO, logDEBUG,
logDEBUG1, logDEBUG2, logDEBUG3, logDEBUG4};
template <typename T>
class Log
{
public:
Log();
virtual ~Log();
std::ostringstream& Get(TLogLevel level = logINFO);
public:
static TLogLevel& ReportingLevel();
static std::string ToString(TLogLevel level);
static TLogLevel FromString(const std::string& level);
protected:
std::ostringstream os;
private:
Log(const Log&);
Log& operator =(const Log&);
};
template <typename T>
Log<T>::Log()
{
}
template <typename T>
std::ostringstream& Log<T>::Get(TLogLevel level)
{
// os << "- " << NowTime();
// os << " " << ToString(level) << ": ";
// os << std::string(level > logDEBUG ? level - logDEBUG : 0, '\t');
return os;
}
template <typename T>
Log<T>::~Log()
{
os << std::endl;
/*
if (T::Stream() != stderr) {
fprintf(stderr, "%s", os.str().c_str());
fflush(stderr);
}
T::Output(os.str());
*/
DebugLog(os.str().c_str());
}
template <typename T>
TLogLevel& Log<T>::ReportingLevel()
{
static TLogLevel reportingLevel = logDEBUG4;
return reportingLevel;
}
template <typename T>
std::string Log<T>::ToString(TLogLevel level)
{
static const char* const buffer[] = {"ERROR", "WARNING", "INFO", "DEBUG",
"DEBUG1", "DEBUG2", "DEBUG3", "DEBUG4"};
return buffer[level];
}
template <typename T>
TLogLevel Log<T>::FromString(const std::string& level)
{
if (level == "DEBUG4")
return logDEBUG4;
if (level == "DEBUG3")
return logDEBUG3;
if (level == "DEBUG2")
return logDEBUG2;
if (level == "DEBUG1")
return logDEBUG1;
if (level == "DEBUG")
return logDEBUG;
if (level == "INFO")
return logINFO;
if (level == "WARNING")
return logWARNING;
if (level == "ERROR")
return logERROR;
Log<T>().Get(logWARNING) << "Unknown logging level '" << level
<< "'. Using INFO level as default.";
return logINFO;
}
class Output2FILE
{
public:
static FILE*& Stream();
static void Output(const std::string& msg);
};
inline FILE*& Output2FILE::Stream()
{
static FILE* pStream = stderr;
return pStream;
}
inline void Output2FILE::Output(const std::string& msg)
{
/*
FILE* pStream = Stream();
if (!pStream)
return;
fprintf(pStream, "%s", msg.c_str());
fflush(pStream);
*/
}
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
# if defined (BUILDING_FILELOG_DLL)
# define FILELOG_DECLSPEC __declspec (dllexport)
# elif defined (USING_FILELOG_DLL)
# define FILELOG_DECLSPEC __declspec (dllimport)
# else
# define FILELOG_DECLSPEC
# endif // BUILDING_DBSIMPLE_DLL
#else
# define FILELOG_DECLSPEC
#endif // _WIN32
class FILELOG_DECLSPEC FILELog : public Log<Output2FILE> {};
//typedef Log<Output2FILE> FILELog;
#ifndef FILELOG_MAX_LEVEL
#define FILELOG_MAX_LEVEL logDEBUG4
#endif
#define LOG(level) \
if (level > FILELOG_MAX_LEVEL) ;\
else if (level > FILELog::ReportingLevel() || !Output2FILE::Stream()) ; \
else FILELog().Get(level) \
#define LOG_ERROR LOG(logERROR)
#define LOG_WARNING LOG(logWARNING)
#define LOG_INFO LOG(logINFO)
#define LOG_DEBUG LOG(logDEBUG)
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
#include <windows.h>
inline std::string NowTime()
{
const int MAX_LEN = 200;
char buffer[MAX_LEN];
if (GetTimeFormatA(LOCALE_USER_DEFAULT, 0, 0,
"HH':'mm':'ss", buffer, MAX_LEN) == 0)
return "Error in NowTime()";
char result[100] = {0};
static DWORD first = GetTickCount();
#pragma warning(suppress: 4996)
sprintf(result, "%s.%03ld", buffer, (long)(GetTickCount() - first) % 1000);
return result;
}
#else
#include <sys/time.h>
inline std::string NowTime()
{
char buffer[11];
time_t t;
time(&t);
tm r = {0};
strftime(buffer, sizeof(buffer), "%X", localtime_r(&t, &r));
struct timeval tv;
gettimeofday(&tv, 0);
char result[100] = {0};
sprintf(result, "%s.%03ld", buffer, (long)tv.tv_usec / 1000);
return result;
}
#endif //WIN32
#endif //__LOG_H__