Log.h

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// Copyright 2014 GSI, Inc. All rights reserved.
//
// Log engine core.
//
#ifndef CLOG_H
#define CLOG_H

// API
#include <sys/time.h>
// STD
#include <ctime>
#include <fstream>
#include <iostream>
#include <sstream>
// STL
#include <string>
// MiscCommon
#include "Res.h"
#include "SysHelper.h"
#include "def.h"

namespace MiscCommon
{
    typedef enum ESeverity {
        LOG_SEVERITY_INFO = 0x01,
        LOG_SEVERITY_WARNING = 0x02,
        LOG_SEVERITY_FAULT = 0x04,
        LOG_SEVERITY_CRITICAL_ERROR = 0x08,
        LOG_SEVERITY_DEBUG = 0x10
    } LOG_SEVERITY;
    enum
    {
        e_FieldSeparator = 0x20,
        e_WhiteSpace = 0x20
    };
    template <typename _T>
    class CLog
    {
      public:
        CLog(_T* _stream, unsigned char _logLevel)
            : m_stream(_stream)
            , m_logLevel(_logLevel)
        {
        }

        void push(LOG_SEVERITY _Severity,
                  unsigned long _ErrorCode,
                  const std::string& _Module,
                  const std::string& _Message)
        {
            if ((_Severity & m_logLevel) != _Severity)
                return;

            // Thread ID
            pid_t tid = gettid();
            std::string _DTBuff;
            std::stringstream strMsg;
            strMsg << GetCurTimeString(&_DTBuff) << char(e_FieldSeparator) << GetSeverityString(_Severity)
                   << char(e_FieldSeparator) << GetErrorCode(_ErrorCode) << char(e_FieldSeparator) << "[" << _Module
                   << ":thread-" << tid << "]" << char(e_FieldSeparator) << _Message;

            smart_mutex m(m_mutex);
            if (m_stream && m_stream->good())
            {
                *m_stream << strMsg.str() << std::endl;
                m_stream->flush();
            }
            else
            {
                std::cout << strMsg.str() << std::endl;
            }
        }

      private:
        std::string& GetCurTimeString(std::string* _Buf)
        {
            if (!_Buf)
                return *_Buf;

            // Obtain the time of day, and convert it to a tm struct.
            timeval tv;
            gettimeofday(&tv, NULL);
            tm* tm_now(localtime(&tv.tv_sec));
            CHARVector_t buff(LOG_DATETIME_BUFF_LEN);
            strftime(&buff[0], sizeof(char) * LOG_DATETIME_BUFF_LEN, g_cszLOG_DATETIME_FRMT, tm_now);
            const long milliseconds = tv.tv_usec / 1000;
            *_Buf = &buff[0];
            std::stringstream ss;
            ss << "." << milliseconds;
            *_Buf += ss.str();
            return *_Buf;
        }

        const std::string GetSeverityString(LOG_SEVERITY _Severity) const
        {
            switch (_Severity)
            {
                case LOG_SEVERITY_INFO:
                    return g_cszLOG_SEVERITY_INFO;
                case LOG_SEVERITY_WARNING:
                    return g_cszLOG_SEVERITY_WARNING;
                case LOG_SEVERITY_FAULT:
                    return g_cszLOG_SEVERITY_FAULT;
                case LOG_SEVERITY_CRITICAL_ERROR:
                    return g_cszLOG_SEVERITY_CRITICAL_ERROR;
                default:
                    return g_cszLOG_SEVERITY_DEBUG;
            }
        }

        std::string GetErrorCode(unsigned long _ErrorCode) const
        {
            std::stringstream sErrCode;
            sErrCode << _ErrorCode;
            return sErrCode.str();
        }

      private:
        _T* m_stream;
        CMutex m_mutex;
        unsigned char m_logLevel;
    };
    typedef CLog<std::ostream> CSTDOutLog;
    class CFileLog : public CLog<std::ofstream>
    {
      public:
        typedef std::ofstream stream_type;

      public:
        CFileLog(const std::string& _LogFileName,
                 bool _CreateNew = false,
                 unsigned char _logLevel = LOG_SEVERITY_INFO | LOG_SEVERITY_WARNING | LOG_SEVERITY_FAULT |
                                           LOG_SEVERITY_CRITICAL_ERROR)
            : CLog<stream_type>(&m_log_file, _logLevel)
            , m_log_file(_LogFileName.c_str(), (_CreateNew ? std::ios::trunc : std::ios::app) | std::ios::out)
        {
        }

      private:
        stream_type m_log_file;
    };
};
#endif