#!/bin/bash
# 
# Munin plugin for ejabberd2.
# This script supports versions 2.0 and 2.1 of ejabberd.
#
# Written by Lasse Karstensen <lkarsten@hyse.org> 2007-05-27.
# Based on ejabberd-plugin by Christian Dröge <Christian@draugr.de>
#
# Status, memory, threads, ejabberd2 and other code optimalisation
# 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 ln -s ejabberd ejabberd_(connections|users|registrations|statuses|memory|threads|usersindays|uptime)
# to activate.
#
# If the autodetect-feature for vhosts breaks, you can set
# """
# [ejabberd*]
# env.vhosts foo.com bar.com
# env.statuses available away chat xa # monitoring of statuses
# env.days 1 7 30                     # monitoring for usersindays
# user ejabberd                       # user ejabberd should have enough priviledges
#                                     # depends on your setup
# """
# in plugin-conf.d/munin-node to override it.
#
#%# family=auto
#%# capabilities=autoconf suggest

EJCTL=$(which ejabberdctl)
EJVER=$($EJCTL status | awk '/^ejabberd / {print $2}')

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

# Add munin argument to ejabberdctl to prevent a lot of ejabberdctl
# records in memory see discussion:
# http://lists.jabber.ru/pipermail/ejabberd/2009-September/005337.html
# Add these lines to ejabberdctl script to get it work
#@@ -56,6 +56,15 @@
#            $KERNEL_OPTS \
#            "$@"
#     ;;
#+    munin)
#+        shift
#+        exec $ERL $SNAME ejabberdctlmunin \
#+            -pa $EBIN_DIR \
#+            -s ejabberd_ctl \
#+            -noinput \
#+            $KERNEL_OPTS \
#+            -extra $ERLANG_NODE "$@"
#+    ;;
#     *)
#        exec $ERL $SNAME ejabberdctl$SUFFIX \
#            -pa $EBIN_DIR \
#
# Or just comment out following line
EJCTL="$EJCTL munin"

# 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
if [[ ${EJVER%\.[0-9]} == 2.1 ]]; then
    EJPID=$(cat /var/run/ejabberd/ejabberd.pid)
else
    EJPID=$(ps -ef | awk '/\/bin\/beam.smp/ && !/awk/ {print $2}')
fi

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 [ "$1" = "config" ]; then
    echo 'graph_category ejabberd'
    echo 'graph_info This graph shows statistics of ejabberd server'
    if [ "$MODE" == "memory" ]; then
        echo 'graph_args --base 1024 -l 0'
        echo 'graph_scale yes'
        echo 'graph_title Memory usage'
        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'
        if [ "$MODE" == "connections" ]; then
            echo 'graph_title Server-to-server conections'
            echo 'graph_vlabel connections'
            echo 's2s_connections_out.label outgoing s2s connections'
            echo 's2s_connections_out.info Number of outgoing server to server connections'
            echo 's2s_connections_in.label incoming s2s connections'
            echo 's2s_connections_in.info Number of incoming server to server connections'
        elif [ "$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 User registrations'
            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 User 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 Users with status $status on $host [xa=not available, dnd=(do not disturb) or (busy), chat=free for chat]"
                done
            done
        elif [ "$MODE" == "threads" ]; then
            echo 'graph_title Threads'
            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'
            echo 'graph_vlabel users'
            for host in $vhosts; do
                for num in $days; do
                    formathost=$(echo $host | tr '.' '_')
                    echo "usersindays_${formathost}_${num}.label $host active users [$num days]"
                    echo "usersindays_${formathost}_${num}.info Number of $host users active in last $num days"
                done
            done
        elif [ "$MODE" == "uptime" ]; then
            echo 'graph_title Uptime'
            echo 'graph_vlabel days'
            echo "uptime.label uptime"
            echo 'uptime.draw AREA'
        fi
    fi
    exit 0
fi

if [[ ${EJVER%\.[0-9]} == 2.1 ]]; then
    if [ "$MODE" == "users" ]; then
        for host in $vhosts; do
            formathost=$(echo $host | tr '.' '_')
            echo "connected_users_$formathost.value $($EJCTL stats_host onlineusers $host)"
            echo "connected_unique_users_$formathost.value $($EJCTL connected_users_vhost $host | awk -v var=$host -F/ '{users[$1]} END {for (user in users) {if (index(user,var)) {count++}} print count}')"
        done
    elif [ "$MODE" == "registrations" ]; then
        for host in $vhosts; do
             formathost=$(echo $host | tr '.' '_')
             num=$($EJCTL stats_host registeredusers $host)
             if [ "$?" != 0 ]; then
                 num="U"
             fi
             echo "registered_$formathost.value $num"
        done
    elif [ "$MODE" == "statuses" ]; then
        for host in $vhosts; do
            formathost=$(echo $host | tr '.' '_')
            for status in $statuses; do
                num=$($EJCTL status_num_host $host $status)
                if [ "$?" != 0 ]; then
                    num="U"
                fi
                echo "status_${formathost}_${status}.value $num"
            done
        done
    elif [ "$MODE" == "usersindays" ]; then
        for host in $vhosts; do
            for num in $days; do
                formathost=$(echo $host | tr '.' '_')
                echo "usersindays_${formathost}_${num}.value $($EJCTL num_active_users $host $num)"
            done
        done
    elif [ "$MODE" == "uptime" ]; then
        echo "uptime.value $($EJCTL stats uptimeseconds | awk '{printf "%.2f", $1/86400}')"
    elif [ "$MODE" == "connections" ]; then
        echo "s2s_connections_out.value $($EJCTL outgoing_s2s_number)"
        echo "s2s_connections_in.value $($EJCTL incoming_s2s_number)"
    fi
elif [[ ${EJVER%\.[0-9]} == 2.0 ]]; then
    if [ "$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[$1]} END {for (user in users) {if (index(user,var)) {count++}} print count}')"
        done
    elif [ "$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 $num"
        done
    elif [ "$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 $num"
            done
        done
    elif [ "$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 $num)"
            done
        done
    elif [ "$MODE" == "uptime" ]; then
        echo "uptime.value $($EJCTL stats uptime-seconds | awk '{printf "%.2f", $1/86400}')"
    elif [ "$MODE" == "connections" ]; then
        echo "s2s_connections_out.value $($EJCTL outgoing-s2s-number)"
        echo "s2s_connections_in.value $($EJCTL incoming-s2s-number)"
    fi
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)"
elif [ "$MODE" == "threads" ]; then
    echo "ejabberd_threads.value $(awk '/Threads/ {print $2}' /proc/${EJPID}/status)"
fi
exit 0