LogHandler.cpp

/*
   Copyright (C) 2003-2006, 2008 MySQL AB
    All rights reserved. Use is subject to license terms.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include "LogHandler.hpp"

#include <NdbTick.h>

//
// PUBLIC
//
LogHandler::LogHandler() : 
  m_pDateTimeFormat("%d-%.2d-%.2d %.2d:%.2d:%.2d"),
  m_errorCode(0),
  m_errorStr(NULL)
{
  m_max_repeat_frequency= 3; // repeat messages maximum every 3 seconds
  m_count_repeated_messages= 0;
  m_last_category[0]= 0;
  m_last_message[0]= 0;
  m_last_log_time= 0;
  m_now= 0;
  m_last_level= (Logger::LoggerLevel)-1;
}

LogHandler::~LogHandler()
{  
}

void 
LogHandler::append(const char* pCategory, Logger::LoggerLevel level,
                   const char* pMsg)
{
  time_t now;
  now= ::time((time_t*)NULL);

  if (m_max_repeat_frequency == 0 ||
      level != m_last_level ||
      strcmp(pCategory, m_last_category) ||
      strcmp(pMsg, m_last_message))
  {
    if (m_count_repeated_messages > 0) // print that message
      append_impl(m_last_category, m_last_level, m_last_message);

    m_last_level= level;
    strncpy(m_last_category, pCategory, sizeof(m_last_category));
    strncpy(m_last_message, pMsg, sizeof(m_last_message));
  }
  else // repeated message
  {
    if (now < (time_t) (m_last_log_time+m_max_repeat_frequency))
    {
      m_count_repeated_messages++;
      m_now= now;
      return;
    }
  }

  m_now= now;

  append_impl(pCategory, level, pMsg);
  m_last_log_time= now;
}

void 
LogHandler::append_impl(const char* pCategory, Logger::LoggerLevel level,
                        const char* pMsg)
{
  writeHeader(pCategory, level);
  if (m_count_repeated_messages <= 1)
    writeMessage(pMsg);
  else
  {
    BaseString str(pMsg);
    str.appfmt(" - Repeated %d times", m_count_repeated_messages);
    writeMessage(str.c_str());
  }
  m_count_repeated_messages= 0;
  writeFooter();
}

const char* 
LogHandler::getDefaultHeader(char* pStr, const char* pCategory, 
                             Logger::LoggerLevel level) const
{
  char time[MAX_DATE_TIME_HEADER_LENGTH];
  BaseString::snprintf(pStr, MAX_HEADER_LENGTH, "%s [%s] %s -- ", 
             getTimeAsString((char*)time),
             pCategory,
             Logger::LoggerLevelNames[level]);
 
  return pStr;
}


const char* 
LogHandler::getDefaultFooter() const
{
  return "\n";
}

const char* 
LogHandler::getDateTimeFormat() const
{
  return m_pDateTimeFormat;     
}

void 
LogHandler::setDateTimeFormat(const char* pFormat)
{
  m_pDateTimeFormat = (char*)pFormat;
}

char* 
LogHandler::getTimeAsString(char* pStr) const 
{
  struct tm* tm_now;
  tm_now = ::localtime(&m_now); //uses the "current" timezone

  BaseString::snprintf(pStr, MAX_DATE_TIME_HEADER_LENGTH, 
             m_pDateTimeFormat, 
             tm_now->tm_year + 1900, 
             tm_now->tm_mon + 1, //month is [0,11]. +1 -> [1,12]
             tm_now->tm_mday,
             tm_now->tm_hour,
             tm_now->tm_min,
             tm_now->tm_sec);
  
  return pStr;
}

int 
LogHandler::getErrorCode() const
{
  return m_errorCode;
}

void 
LogHandler::setErrorCode(int code)
{
  m_errorCode = code;
}


char*
LogHandler::getErrorStr()
{
  return m_errorStr;
}

void
LogHandler::setErrorStr(const char* str)
{
  m_errorStr= (char*) str;
}

bool
LogHandler::parseParams(const BaseString &_params) {
  Vector<BaseString> v_args;

  bool ret = true;

  _params.split(v_args, ",");
  for(size_t i=0; i < v_args.size(); i++) {
    Vector<BaseString> v_param_value;
    if(v_args[i].split(v_param_value, "=", 2) != 2)
    {
      ret = false;
      setErrorStr("Can't find key=value pair.");
    }
    else
    {
      v_param_value[0].trim(" \t");
      if (!setParam(v_param_value[0], v_param_value[1]))
      {
        ret = false;
      }
    }
  }

  if(!checkParams())
    ret = false;
  return ret;
}

bool
LogHandler::checkParams() {
  return true;
}

void LogHandler::setRepeatFrequency(unsigned val)
{
  m_max_repeat_frequency= val;
}

//
// PRIVATE
//