#!/bin/bash
#munin plugin for cpu usage monitoring of minetestserver for given port
#author: Ritchie
#thanks Pitriss for advices
#inspired by plugin minecraft-users-ram_
#https://github.com/munin-monitoring/contrib/blob/master/plugins/minecraft/minecraft-users-ram_
#Author & instructions: http://wiki.natenom.name/minecraft/munin-plugin
 
LC_LANG=C
MT_PORT=${0##*_}
 
if [ "$1" = "config" ]
then
#NCPU=$(egrep '^cpu[0-9]+ ' /proc/stat | wc -l)
#        if [ "$scaleto100" = "yes" ]; then
#                graphlimit=100
#        else
#                graphlimit=$(($NCPU * 100))
#        fi
#    printf 'graph_title Minetestserver CPU usage (Port %s)\n' ${MT_PORT}
#    echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit $graphlimit"
#    printf 'graph_vlabel %\n'
#    echo 'graph_scale no'
#    printf 'cpuusage.label cpu usage\n'
#    printf 'graph_category minetest'
#    printf 'graph_info Shows RAM usage by minetestserver process'
#echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit $graphlimit"
	echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit 100"
	echo "graph_title Minetestserver CPU usage (Port ${MT_PORT})"
	echo "graph_category minetest"
	echo "graph_info This graph shows CPU usage for minetestserver."
	echo "graph_vlabel %"
	echo "graph_scale no"
	echo "graph_period second"
	echo "cpuusage.label cpu usage"
exit 0
fi
 
MT_PID=$(netstat -ulpn 2>/dev/null | grep ${MT_PORT}  | sed -n -e '1p' | awk '{ print $6 }' | cut -d'/' -f1)
if [ ! -z "${MT_PID}" ]
then #is running
    CPUusage=$(ps aux | grep ${MT_PID} | grep -v grep | awk '{print $3}')
else
 
    CPUusage=0
fi
 
printf "cpuusage.value %3.2f\n" "${CPUusage}"