#!/bin/bash
# 
# Munin plugin for ejabberd2.
#
# Written by Lasse Karstensen <lkarsten@hyse.org> 2007-05-27.
# Based on ejabberd-plugin by Christian Dröge <Christian@draugr.de>
#
# Status, memory, threads, uptime, usersindays, ejabberd2 and other code
# optimisation by Peter Viskup <skupko.sk@gmail.com>
#
# As connected users, registered users and server-connections have somewhat
# different scales, this plugin uses munins suggest feature to create three
# different graphs.
# 
# ejabberd_connections
# ejabberd_users
# ejabberd_registrations
# ejabberd_statuses
# ejabberd_memory
# ejabberd_threads
# ejabberd_usersindays
# ejabberd_uptime
#
# use command
# ln -s ejabberd_ ejabberd_(connections|memory|registrations|statuses|threads|uptime|users|usersindays) 
# to activate.
#
# If the autodetect-feature for vhosts breaks, you can set  
# """
# [ejabberd_*]
# env.vhosts foo.com bar.com
# """
# in plugin-conf.d/munin-node to override it.
# (user root may also be smart/not so smart depending on your setup.)
# Be aware that datasource name of rrdtool is restricted to 19 characters maximum. It could lead to not working plugin if vhost string is too long.
# http://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html
#
# For monitoring user statuses - define statuses environment variable:
# (you can monitor only some of them)
# [ejabberd_*]
# env.statuses available away chat xa
#
# For usersindays statistics define days environment variable
# Be careful on high loaded servers, because it will plot all days in one
# graph.
# [ejabberd_*]
# env.days 1 7 30
#
#%# family=auto
#%# capabilities=autoconf suggest

EJCTL=$(which ejabberdctl)
if [ "$1" == "autoconf" ]; then
        if [ -x "$EJCTL" > /dev/null ]; then
                echo yes
                exit 0
        fi
        echo "no (ejabberdctl not found)"
        exit 1
fi

if [ "$1" == "suggest" ]; then
    echo "connections"
    echo "users"
    echo "registrations"
    echo "statuses"
    echo "memory"
    echo "threads"
    echo "usersindays"
    echo "uptime"
    exit 0
fi

# trying to autodetect running vhosts.
if [ -z "$vhosts" ]; then
    for CFGPATH in /etc/ejabberd /usr/local/ejabberd/etc; do
	if [ -f "$CFGPATH/ejabberd.cfg" ]; then
	    EJCFG=$CFGPATH/ejabberd.cfg;
	fi
    done
    if [ -z "$EJCFG" ]; then
        echo "Unable to find ejabberd.cfg. Exiting." > /dev/stderr
        exit -1
    fi
    # you have to have all of vhosts defined on one line in $EJCFG or in plugins-conf.d/munin-node config file
    vhosts=$(awk '/^\s*{hosts/ {gsub( /\{\s?hosts\s?,|[\",\[\]]|\}\s?.|localhost/ ,""); print;}' $EJCFG);
fi

# get ejabberd PID
# in GNU/Linux Debian Lenny release the pidof command can be executed only by root
#EJPID=$(pidof -s /usr/lib/erlang/erts-5.6.3/bin/beam.smp)
EJPID=$(ps -ef | awk '/ejabberd/ && /\/bin\/beam(.smp)?/ {print $2}')

if [ -z "$vhosts" ]; then
    echo "No vhosts to sample." > /dev/stderr
    echo "Please set env.vhosts in plugins-conf.d/munin-node." > /dev/stderr
    exit -1
fi

MODE=`basename $0 | sed 's/^ejabberd_//g'`

if ! [ "$MODE" == "connections" -o "$MODE" == "users" \
  -o "$MODE" == "registrations" -o "$MODE" == "statuses" \
  -o "$MODE" == "memory" -o "$MODE" == "threads" \
  -o "$MODE" == "usersindays" -o "$MODE" == "uptime" ]; then
    echo "ERROR: Unknown mode \"$MODE\". Exiting." > /dev/stderr
    exit -1
fi

if [ "$1" = "config" ]; then
    if [ "$MODE" == "memory" ]; then
	echo 'graph_args --base 1024 -l 0'
	echo 'graph_scale yes'
	echo 'graph_category ejabberd'
	echo 'graph_info This graph shows a statistic of ejabberd'
	echo 'graph_title Memory of ejabberd process'
	echo 'graph_vlabel Bytes'
	echo "ejabberd_memory_size.label actual memory";
	echo "ejabberd_memory_size.info Memory used by ejabberd process in Bytes";
	echo "ejabberd_memory_peak.label memory peak";
	echo "ejabberd_memory_peak.info Memory peak of ejabberd process in Bytes";
    else
    echo 'graph_args --base 1000 -l 0'
    echo 'graph_scale no'
    echo 'graph_category ejabberd'
    echo 'graph_info This graph shows a statistic of ejabberd'

    if [ "$MODE" == "connections" ]; then
	echo 'graph_title Server-to-server conections'
	echo 'graph_vlabel s2s'
        echo 's2s_connections_out.label incoming s2s connections'
        echo 's2s_connections_out.info Number of outgoing server to server connections'
        echo 's2s_connections_in.label outgoing s2s connections'
        echo 's2s_connections_in.info Number of incoming server to server connections'
    elif [ "$MODE" == "users" ]; then
	echo 'graph_title Connected users'
	echo 'graph_vlabel users'
	for host in $vhosts; do
	    formathost=$(echo $host | tr '.' '_')
	    echo "connected_users_$formathost.label $host connected users";
	    echo "connected_unique_users_$formathost.label $host unique connected users";
	done;
    elif [ "$MODE" == "registrations" ]; then
	echo 'graph_title Number of registered users'
	echo 'graph_vlabel users'
	for host in $vhosts; do
	    formathost=$(echo $host | tr '.' '_')
	    echo "registered_$formathost.label $host registered users";
	    echo "registered_$formathost.info Registered users for vhost $host"
	done;
    elif [ "$MODE" == "statuses" ]; then
	echo 'graph_title Users with statuses'
	echo 'graph_vlabel users'
	for host in $vhosts; do
		for status in $statuses; do
			formathost=$(echo $host | tr '.' '_')
		   echo "status_${formathost}_${status}.label $status on $host"; 
	  	 	echo "status_${formathost}_${status}.info Number of users with status $status on $host [available, away, xa=not available, dnd=(do not disturb) or (busy), chat=free for chat]";
		done;
	done;
    elif [ "$MODE" == "threads" ]; then
	echo 'graph_title Threads of ejabberd process'
	echo 'graph_vlabel threads'
	echo "ejabberd_threads.label number of threads";
	echo "ejabberd_threads.info Number of threads of ejabberd process";
    elif [ "$MODE" == "usersindays" ]; then
	echo 'graph_title Active users in last days'
	echo 'graph_vlabel users'
	for host in $vhosts; do
		for num in $days; do
			formathost=$(echo $host | tr '.' '_')
			echo "usersindays_${formathost}_${num}.label active users on $host in last $num days";
			echo "usersindays_${formathost}_${num}.info Number of users active on $host in last $num days";
		done;
	done;
    elif [ "$MODE" == "uptime" ]; then
	echo 'graph_title Uptime of ejabberd server'
	echo 'uptime in days'
	echo "uptime.label uptime"
	echo 'uptime.draw AREA'
    fi
    fi
    exit 0
fi

if [ "$MODE" == "connections" ]; then
    echo "s2s_connections_out.value $($EJCTL outgoing-s2s-number)"
    echo "s2s_connections_in.value $($EJCTL incoming-s2s-number)"
    exit 0
fi

if [ "$MODE" == "users" ]; then
    for host in $vhosts; do
	formathost=$(echo $host | tr '.' '_')
	echo "connected_users_$formathost.value $($EJCTL vhost $host stats onlineusers)"; 
	echo "connected_unique_users_$formathost.value $($EJCTL connected-users | awk -v var=$host -F/ '{users[$1]} END {for (user in users) {if (index(user,var)) {count++}} print count}')"; 
    done
    exit 0
fi

if [ "$MODE" == "registrations" ]; then
    for host in $vhosts; do
	formathost=$(echo $host | tr '.' '_')
	num=$($EJCTL vhost $host stats registeredusers)
        if [ "$?" != 0 ]; then
            num="U"
        fi
	echo "registered_$formathost.value $num"; 
    done
    exit 0
fi

if [ "$MODE" == "statuses" ]; then
   for host in $vhosts; do
	formathost=$(echo $host | tr '.' '_')
		for status in $statuses; do
			num=$($EJCTL vhost $host status-num $status)
			if [ "$?" != 0 ]; then
				num="U"
			fi
			echo "status_${formathost}_${status}.value $num";
		done
	 done
    exit 0
fi

if [ "$MODE" == "memory" ]; then
    echo "ejabberd_memory_size.value $(awk '/VmSize/ {print $2*1024}' /proc/${EJPID}/status)"
    echo "ejabberd_memory_peak.value $(awk '/VmPeak/ {print $2*1024}' /proc/${EJPID}/status)"
    exit 0
fi

if [ "$MODE" == "threads" ]; then
    echo "ejabberd_threads.value $(awk '/Threads/ {print $2}' /proc/${EJPID}/status)"
    exit 0
fi

if [ "$MODE" == "usersindays" ]; then
        for host in $vhosts; do
                for num in $days; do
                        formathost=$(echo $host | tr '.' '_')
                        echo "usersindays_${formathost}_${num}.value $($EJCTL vhost $host num-active-users $num)";
                done;
        done;
	exit 0
fi

if [ "$MODE" == "uptime" ]; then
	echo "uptime.value $($EJCTL stats uptime-seconds | awk '{printf "%.2f", $1/86400}')"
fi