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#ifndef LOG_H__
#define LOG_H__
#include <string>
#include <iostream>
#include <sstream>
#include <fstream>
#include <functional>
#include <chrono>
#include <memory>
#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 () { SetOnEmpty (std::bind (&Log::Flush, this)); };
~Log () {};
void SetLogFile (const std::string& fullFilePath);
void ReopenLogFile ();
void SetLogLevel (const std::string& level);
void SetLogStream (std::shared_ptr<std::ostream> logStream);
std::shared_ptr<std::ostream> GetLogStream () const { return m_LogStream; };
const std::string& GetTimestamp ();
LogLevel GetLogLevel () { return m_MinLevel; };
private:
void Flush ();
private:
std::string m_FullFilePath; // empty if stream
std::shared_ptr<std::ostream> m_LogStream;
enum LogLevel m_MinLevel;
std::string m_Timestamp;
#if (__GNUC__ == 4) && (__GNUC_MINOR__ <= 6) && !defined(__clang__) // 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)
{
auto log = new Log ();
if (fullFilePath.length () > 0)
log->SetLogFile (fullFilePath);
g_Log = log;
}
}
inline void StartLog (std::shared_ptr<std::ostream> s)
{
if (!g_Log)
{
auto log = new Log ();
if (s)
log->SetLogStream (s);
g_Log = log;
}
}
inline void StopLog ()
{
if (g_Log)
{
auto log = g_Log;
g_Log = nullptr;
log->Stop ();
delete log;
}
}
inline void SetLogLevel (const std::string& level)
{
if (g_Log)
g_Log->SetLogLevel(level);
}
inline void ReopenLogFile ()
{
if (g_Log)
g_Log->ReopenLogFile ();
}
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)
{
if (g_Log && level > g_Log->GetLogLevel ())
return;
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;
}
}
#endif