#!/bin/bash -e # log helper base on environment variable CONTAINER_LOG_LEVEL # CONTAINER_LOG_LEVEL environment variable is set by run tool based on --log-level argument (info by default) # or you can set it directly with docker --env argument # Usage example: log-helper info CONTAINER_LOG_LEVEL is info or more # the message "CONTAINER_LOG_LEVEL is info or more" will be printed only if log level is info, debug or trace LOG_LEVEL_NONE=0 LOG_LEVEL_ERROR=1 LOG_LEVEL_WARNING=2 LOG_LEVEL_INFO=3 LOG_LEVEL_DEBUG=4 LOG_LEVEL_TRACE=5 # default log level if CONTAINER_LOG_LEVEL is not set -> info log_level=${CONTAINER_LOG_LEVEL:-${LOG_LEVEL_INFO}} call=$1 # function to call (error, warning, info, debug, trace, level) if [[ ! "$call" =~ ^(error|warning|info|debug|trace|level)$ ]]; then echo "Error: Function $call not found" echo "Allowed functions are: error, warning, info, debug, trace, level" echo "usage example: log-helper info hello !" exit 1 fi echo_msg="" # message to print if required log level is set echo_param="" # echo command parameters function print_log(){ local level_txt=$1 local message=$2 local date=$(date +"%Y-%m-%d %T") readarray -t messages <<<"$message" for m in "${messages[@]}"; do echo "*** ${level_txt} | ${date} | ${m}" done } function error() { # getEchoParams no matter what level it is to not break pipes getEchoParams $@ if [ $log_level -ge 1 ]; then echo $echo_param "$(print_log " ERROR " "$echo_msg")" fi } function warning() { # getEchoParams no matter what level it is to not break pipes getEchoParams $@ if [ $log_level -ge 2 ]; then echo $echo_param "$(print_log "WARNING" "$echo_msg")" fi } function info() { # getEchoParams no matter what level it is to not break pipes getEchoParams $@ if [ $log_level -ge 3 ]; then echo $echo_param "$(print_log " INFO " "$echo_msg")" fi } function debug() { # getEchoParams no matter what level it is to not break pipes getEchoParams $@ if [ $log_level -ge 4 ]; then echo $echo_param "$(print_log " DEBUG " "$echo_msg")" fi } function trace() { # getEchoParams no matter what level it is to not break pipes getEchoParams $@ if [ $log_level -ge 5 ]; then echo $echo_param "$(print_log " TRACE " "$echo_msg")" fi } function getMsgFromStdin() { if [ -z "$2" ]; then echo_msg=$(cat) fi } function getEchoParams() { echo_msg="$@" if [[ "$1" =~ ^(-e|-n|-E)$ ]]; then echo_param=$1 echo_msg=${echo_msg#$1 } fi # read from pipe if echo_msg is empty [[ -n "$echo_msg" ]] || getMsgFromStdin } function level() { local operator=$1 local loglevel_str=$2 local loglevel_str=${loglevel_str^^} # uppercase if [[ ! "$operator" =~ ^(eq|ne|gt|ge|lt|le)$ ]]; then echo "Error: Operator $operator not allowed" echo "Allowed operators are: eq, ne, gt, ge, lt, le" echo "Help: http://www.tldp.org/LDP/abs/html/comparison-ops.html" exit 1 fi if [ -z "$loglevel_str" ]; then echo "Error: No log level provided" echo "Allowed log level are: none, error, warning, info, debug, trace" echo "usage example: log-helper level eq info" exit 1 fi local log_level_var=LOG_LEVEL_$loglevel_str if [ $log_level -$operator ${!log_level_var} ]; then exit 0 else exit 1 fi } shift $call "$@"