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#ifndef LOG_H__
#define LOG_H__
#include <string>
#include <iostream>
#include <sstream>
#include <fstream>
#include <functional>
#include <chrono>
#include "Queue.h"
enum LogLevel
{
eLogError = 0,
eLogWarning,
eLogInfo,
eLogDebug,
eNumLogLevels
};
class Log;
struct LogMsg
{
std::stringstream s;
Log * log;
LogLevel level;
LogMsg (Log * l = nullptr, LogLevel lv = eLogInfo): log (l), level (lv) {};
void Process();
};
class Log: public i2p::util::MsgQueue<LogMsg>
{
public:
Log (): m_LogStream (nullptr) { SetOnEmpty (std::bind (&Log::Flush, this)); };
~Log () { delete m_LogStream; };
void SetLogFile (const std::string& fullFilePath);
void SetLogStream (std::ostream * logStream);
std::ostream * GetLogStream () const { return m_LogStream; };
const std::string& GetTimestamp ();
private:
void Flush ();
private:
std::ostream * m_LogStream;
std::string m_Timestamp;
#if (__GNUC__ == 4) && (__GNUC_MINOR__ <= 6) // gcc 4.6
std::chrono::monotonic_clock::time_point m_LastTimestampUpdate;
#else
std::chrono::steady_clock::time_point m_LastTimestampUpdate;
#endif
};
extern Log * g_Log;
inline void StartLog (const std::string& fullFilePath)
{
if (!g_Log)
{
g_Log = new Log ();
if (fullFilePath.length () > 0)
g_Log->SetLogFile (fullFilePath);
}
}
inline void StartLog (std::ostream * s)
{
if (!g_Log)
{
g_Log = new Log ();
if (s)
g_Log->SetLogStream (s);
}
}
inline void StopLog ()
{
if (g_Log)
{
delete g_Log;
g_Log = nullptr;
}
}
template<typename TValue>
void LogPrint (std::stringstream& s, TValue arg)
{
s << arg;
}
template<typename TValue, typename... TArgs>
void LogPrint (std::stringstream& s, TValue arg, TArgs... args)
{
LogPrint (s, arg);
LogPrint (s, args...);
}
template<typename... TArgs>
void LogPrint (LogLevel level, TArgs... args)
{
LogMsg * msg = new LogMsg (g_Log, level);
LogPrint (msg->s, args...);
msg->s << std::endl;
if (g_Log)
g_Log->Put (msg);
else
{
msg->Process ();
delete msg;
}
}
template<typename... TArgs>
void LogPrint (TArgs... args)
{
LogPrint (eLogInfo, args...);
}
#endif