#!/bin/sh

set -e

: << =cut

=head1 NAME

signaling - Monitor a spreed standalone signaling server

=head1 APPLICABLE SYSTEMS

Signaling server used for Nextcloud Talk
(https://github.com/strukturag/nextcloud-spreed-signaling)

=head1 CONFIGURATION

Requires an installed jq, a command-line json processor.

You may specify the URL where to get the statistics.

 url      - URL of signalign stats endpoint
 max_time - Timeout curl - defaults to 3 seconds

 [signaling]
 env.url http://127.0.0.1:8080/api/v1/stats
 env.max_time 3

=head1 AUTHOR

Copyright (C) 2021 Sebastian L. (https://momou.ch)

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

. "$MUNIN_LIBDIR/plugins/plugin.sh"

STATS_URL=${url:-"http://127.0.0.1:8080/api/v1/stats"}
max_time=${max_time:-3}

case $1 in

    autoconf)
        if [ -x /usr/bin/curl ]; then
            if [ -x /usr/bin/jq ]; then
	        curl -s -f -m "${max_time:-3}" -I "$STATS_URL" | grep -iq "Content-Type: application/json" && echo "yes" && exit 0 || echo "no (invalid or empty response from stats endpoint ($STATS_URL))" && exit 0
            else
                echo "no (jq not found)" && exit 0
            fi
        else
            echo "no (/usr/bin/curl not found)" && exit 0
        fi
        ;;

   config)
        echo "multigraph signaling_mcu"
        echo "graph_title Signaling (Multipoint Conferencing Unit)"
        echo "graph_info Statistics from MCU of signaling server"
        echo "graph_vlabel mcu statistics"
        echo "graph_args --base 1000 -l 0"
        echo "mcu_publishers.label publishers"
        echo "mcu_publishers.info current number of publishers"
        echo "mcu_publishers.min 0"
        echo "mcu_clients.label clients"
        echo "mcu_clients.info current number of clients"
        echo "mcu_clients.min 0"
        echo "multigraph signaling_stats"
        echo "graph_title Signaling (rooms and sessions)"
        echo "graph_info Room and session statistics of signaling server"
        echo "graph_vlabel rooms and sessions"
        echo "graph_args --base 1000 -l 0"
        echo "signaling_rooms.label current rooms"
        echo "signaling_rooms.info current number of rooms"
        echo "signaling_rooms.min 0"
        echo "signaling_rooms.draw AREASTACK"
        echo "signaling_sessions.label current sessions"
        echo "signaling_sessions.info current number of sessions"
        echo "signaling_sessions.min 0"
        echo "signaling_sessions.draw AREASTACK"
	exit 0
        ;;

esac

JSONSTATS=$(curl -s -f -m "$max_time" "$STATS_URL")

echo "multigraph signaling_mcu"
for KEY in publishers clients; do
    VALUE=$(echo "$JSONSTATS" | jq -r ".mcu.$KEY // \"U\"")
    echo "mcu_${KEY}.value $VALUE"
done

echo "multigraph signaling_stats"
for KEY in rooms sessions; do
    VALUE=$(echo "$JSONSTATS" | jq -r ".$KEY // \"U\"")
    echo "signaling_${KEY}.value $VALUE"
done