log.sh

log.sh

#!/bin/bash

LOG_FILE_NAME='MyLogFile'
LOG_FILE_PATH='../log/'
LOG_LEVEL='3' # DEBUG=4 INFO=3 WARN=2 ERR=1 NONE=0
LOG_OUTPUT='2' # STDOUT=1 FILE=2 BOTH=3


_log_level_string=( DEBUG INFO WARN ERR NONE )
_log_output_string=( STDOUT FILE BOTH )
_default_log_path='../log'
_default_log_file="${LOG_FILE_NAME}_$( date +'%Y%m%d%H%M' ).log"

LOG_LEVEL_DEBUG=4
LOG_LEVEL_INFO=3
LOG_LEVEL_WARN=2
LOG_LEVEL_ERR=1
LOG_LEVEL_NONE=0

LOG_LEVEL=${LOG_LEVEL-$LOG_LEVEL_INFO}

LOG_DATE_FORMAT=${LOG_DATE_FORMAT-"%Y/%m/%d %H:%M:%S"}
LOG_FILE=${LOG_FILE-$_default_log_file}
LOG_PATH=${LOG_PATH-$_default_log_path}

LOG_OUTPUT_STDOUT=1
LOG_OUTPUT_FILE=2
LOG_OUTPUT_BOTH=3
LOG_OUTPUT=$LOG_OUTPUT

function _log() {
  local msg="$( date +"$LOG_DATE_FORMAT" ) $*"
  case $LOG_OUTPUT in
    $LOG_OUTPUT_STDOUT)
      echo $msg;;
    $LOG_OUTPUT_FILE)
	  CHECK_LOG_PATH
      echo $msg >> $LOG_PATH'/'$LOG_FILE;;
    $LOG_OUTPUT_BOTH)
	  CHECK_LOG_PATH
      echo $msg | tee -a $LOG_PATH'/'$LOG_FILE;;
  esac
}

function LOG_DEBUG() {
  if [ $LOG_LEVEL_DEBUG -le $LOG_LEVEL ]; then
    _log "DEBUG" $*
  fi
}

function LOG_INFO() {
  if [ $LOG_LEVEL_INFO -le $LOG_LEVEL ]; then
    _log "INFO" $*
  fi
}

function LOG_WARN() {
  if [ $LOG_LEVEL_WARN -le $LOG_LEVEL ]; then
    _log "WARN" $*
  fi
}

function LOG_ERR() {
  if [ $LOG_LEVEL_ERR -le $LOG_LEVEL ]; then
    _log "ERROR" $*
  fi
}

function SET_LOG_LEVEL() {
  local level=$LOG_LEVEL
        case "$level" in
          4)
            LOG_LEVEL=$LOG_LEVEL_DEBUG
            ;;
          3)
            LOG_LEVEL=$LOG_LEVEL_INFO
            ;;
          2)
            LOG_LEVEL=$LOG_LEVEL_WARN
            ;;
          1)
            LOG_LEVEL=$LOG_LEVEL_ERR
            ;;
          0)
            LOG_LEVEL=$LOG_LEVEL_NONE
            ;;
          *)
            echo "LOG error: Invalid log level (${level}). Valid levels are ${_log_level_string[@]}."
            exit 1
            ;;
        esac
}

function CHECK_LOG_PATH() {
	if [ ! -d $LOG_PATH ]; then
		mkdir $LOG_PATH
	fi
}

function LOG_LEVEL_STRING() {
  local ind=$(( $1 - 1 )); echo ${_log_level_string[$ind]}
}

function LOG_OUTPUT_STRING() {
  local ind=$(( $1 - 1 )); echo ${_log_output_string[$ind]}
}

function LOG_INFORMATION() {
  echo "LOG"
  echo ">>> LOG_LEVEL  = $( LOG_LEVEL_STRING $LOG_LEVEL )"
  echo ">>> LOG_OUTPUT = $( LOG_OUTPUT_STRING $LOG_OUTPUT )"
  echo ">>> LOG_FILE   = $LOG_PATH/$LOG_FILE"
  echo
}


SET_LOG_LEVEL
echo $LOG_LEVEL
LOG_INFORMATION
LOG_INFO 'test'
LOG_WARN 'test'