#!/bin/sh
# -*- sh -*-
: <<=cut
=head1 NAME
syncthing_ - Plugin to monitor Syncthing server

=head1 DESCRIPTION
This plugin gathers metrics from a Syncthing server.

This plugin requires the jq utility : https://stedolan.github.io/jq/

Available plugins :
syncthing_cpu       # 
syncthing_mem       #
syncthing_goroutine #
syncthing_transfer  #
syncthing_uptime    #

=head1 CONFIGURATION
To make the plugin connect to the Syncthing server one has to use this type of 
configuration
[syncthing_*]

env.ST_APIKEY myapikey0123456789
env.ST_HOST 127.0.0.1
env.ST_PORT 8384
env.ST_PROTO http

=head1 AUTHOR
Pierre-Alain TORET <pierre-alain.toret@protonmail.com>

=head1 LICENSE
MIT
=cut

function cpu {
    case $1 in
        config)
            cat <<'EOM'
graph_title Syncthing server cpu usage
graph_args -u 100
graph_vlabel %
graph_category network
syncthing_cpu.label cpu
EOM
            exit 0;;
        *)
            printf "syncthing_cpu.value "
            curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/status | jq '.cpuPercent'
    esac
}

function mem {
    case $1 in
        config)
            cat <<'EOM'
graph_title Syncthing server memory
graph_category network
graph_order syncthing_mem_all syncthing_mem_sys
graph_args --base 1000
graph_vlabel bits
syncthing_mem_all.label allocated
syncthing_mem_all.cdef syncthing_mem_all,8,*
syncthing_mem_sys.label obtained
syncthing_mem_sys.cdef syncthing_mem_sys,8,*
EOM
            exit 0;;
	*)
            ALL=$(curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/status | jq '.alloc')
            SYS=$(curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/status | jq '.sys')
            printf "syncthing_mem_all.value $ALL\nsyncthing_mem_sys.value $SYS\n"
    esac
}

function uptime {
    case $1 in
        config)
            cat <<'EOM'
graph_title Syncthing server uptime
graph_vlabel uptime in seconds
graph_category network
syncthing_uptime.label uptime
EOM
            exit 0;;
        *)
            printf "syncthing_uptime.value "
            curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/status | jq '.uptime'
    esac
}

function goroutine {
    case $1 in
        config)
            cat <<'EOM'
graph_title Syncthing server go routines
graph_vlabel number of go routines
graph_category network
syncthing_goroutine.label routines 
EOM
            exit 0;;
        *)
            printf "syncthing_goroutine.value "
            curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/status | jq '.goroutines'
    esac
}

function transfer {
    case $1 in
        config)
            cat <<'EOM'
graph_title Syncthing server total transfer
graph_category network
graph_order syncthing_transfer_down syncthing_transfer_up
graph_args --base 1000
graph_vlabel bits in (-) / out (+) per ${graph_period}
syncthing_transfer_down.label received
syncthing_transfer_down.type COUNTER
syncthing_transfer_down.graph no
syncthing_transfer_down.cdef syncthing_transfer_down,8,*
syncthing_transfer_up.label bps
syncthing_transfer_up.type COUNTER
syncthing_transfer_up.negative syncthing_transfer_down
syncthing_transfer_up.cdef syncthing_transfer_up,8,*
EOM
            exit 0;;
	*)
            IBT=$(curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/connections | jq '.total | .inBytesTotal')
            OBT=$(curl -s -X GET -H "X-API-Key: $ST_APIKEY" $ST_PROTO://$ST_HOST:$ST_PORT/rest/system/connections | jq '.total | .outBytesTotal')
            printf "syncthing_transfer_up.value $IBT\nsyncthing_transfer_down.value $OBT\n"
    esac
}

cd $(dirname $0)

case $(basename $0) in 
    syncthing_cpu)
	cpu $1
	exit 0;;
    syncthing_mem)
	mem $1
	exit 0;;
    syncthing_uptime)
	uptime $1
	exit 0;;
    syncthing_goroutine)
	goroutine $1
	exit 0;;
    syncthing_transfer)
	transfer $1
	exit 0;;
esac