bash-lib-logging

#!/bin/bash
#
# Bash logging library
#

__initLoggingLibrary()
{
	(( ${__LOGGING_LIB_INITIALIZED__} )) && return
	readonly __LOGGING_LIB_INITIALIZED__=1

	readonly DEFAULT_LOG_DIR="${pwd}"
	readonly DEFAULT_LOG_FILE_NAME="app.log"
	readonly DEFAULT_LOG_TAG="APP-LOG"

	LOG_DIR="${DEFAULT_LOG_DIR}"
	LOG_FILE_NAME="${DEFAULT_LOG_FILE_NAME}"
	LOG_FILE="${LOG_DIR}/${LOG_FILE_NAME}"
	LOG_TAG="${DEFAULT_LOG_TAG}"

	LOGGING_ENABLED=0
	LOGGING_BACKUP=0
}

setLogDirectory()
{
	LOG_DIR=${1:-${LOG_DIR}}
	LOG_FILE="${LOG_DIR}/${LOG_FILE_NAME}"
}

setLogFileName()
{
	LOG_FILE_NAME=${1:-${LOG_FILE_NAME}}
	LOG_FILE="${LOG_DIR}/${LOG_FILE_NAME}"
}

setLogTag()
{
	LOG_TAG=$1
}

enableLogging()
{
	LOGGING_ENABLED=1
}

disableLogging()
{
	LOGGING_ENABLED=0
}

enableLogBackup()
{
	LOGGING_BACKUP=1
}

disableLogBackup()
{
	LOGGING_BACKUP=0 
}

newLogFile()
{
	if [ -f "${LOG_FILE}" ]; then
		if (( ${LOGGING_ENABLED} )) && (( ${LOGGING_BACKUP} )); then
			local backupLogFile="${LOG_FILE}-$(ls --full-time ${LOG_FILE} | awk '{ print $6"_"$7 }' | sed 's/[.].*$//')"
			if (( $(cp ${LOG_FILE} ${backupLogFile} 2>&1; echo $?) )); then
				echo "WARN: Failed to create backup of the previous log file"
			fi
		fi
	fi
	if (( $(cat /dev/null > ${LOG_FILE} 2>&1; echo $?) )); then
		echo "Failed to create/clear the log file [${LOG_FILE}]"
		echo "Exiting..."
		exit 1
	fi
}

log()
{
	if (( LOGGING_ENABLED )); then
		echo -e "${1}" | tee -a ${LOG_FILE}
	else
		echo -e "${1}"
	fi
}

logPipe()
{
	while read message; do
		log "${message}"
	done
}

abort()
{
	local msg=${1}
	local exitCode=${2:-1}
	log "${1}"
	log "Aborting..."
	exit ${exitCode}
}

__initLoggingLibrary

#::END::