Add strelaysrv plugin

Signed-off-by: Pierre-Alain TORET <pierre-alain.toret@protonmail.com>

plugins/syncthing/strelaysrv_

@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+: <<=cut
+=head1 NAME
+strelaysrv_ - Plugin to monitor Syncthing relay server
+
+=head1 DESCRIPTION
+This plugin gathers metrics from a Syncthing relay server.
+
+This plugin requires the jq utility : https://stedolan.github.io/jq/
+This plugin requires the curl utility : https://curl.haxx.se/
+
+Available plugins :
+strelaysrv_goroutine #
+strelaysrv_num       # 
+strelaysrv_proxied   #
+strelaysrv_transfer  #
+strelaysrv_uptime    #
+
+=head1 CONFIGURATION
+To make the plugin connect to the Syncthing relay server one has to use this type of 
+configuration
+[strelaysrv_*]
+
+env.STR_HOST 127.0.0.1
+env.STR_PORT 22070
+
+=head1 AUTHOR
+Pierre-Alain TORET <pierre-alain.toret@protonmail.com>
+
+=head1 LICENSE
+MIT
+=cut
+
+function num {
+    case $1 in
+       config)
+            cat <<'EOM'
+graph_title Syncthing relay numbers
+graph_category network
+graph_vlabel numbers
+strelaysrv_num_sessions.label sessions
+strelaysrv_num_connections.label connections
+strelaysrv_num_pending.label pending session keys
+strelaysrv_num_proxies.label proxies
+EOM
+        exit 0;;
+        *)
+            NS=$($CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.numActiveSessions ')
+            NC=$($CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.numConnections ')
+            NK=$($CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.numPendingSessionKeys ')
+            NP=$($CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.numProxies ')
+            printf "strelaysrv_num_sessions.value $NS\nstrelaysrv_num_connections.value $NC\nstrelaysrv_num_pending.value $NK\nstrelaysrv_num_proxies.value $NP\n"
+    esac
+}
+
+function uptime {
+    case $1 in
+       config)
+            cat <<'EOM'
+graph_title Syncthing relay uptime
+graph_vlabel uptime in seconds
+graph_category network
+strelaysrv_uptime.label uptime
+EOM
+        exit 0;;
+        *)
+            printf "strelaysrv_uptime.value "
+            $CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.uptimeSeconds' 
+    esac
+}
+
+function goroutine {
+    case $1 in
+       config)
+            cat <<'EOM'
+graph_title Syncthing relay go routines
+graph_vlabel number of go routines
+graph_category network
+strelaysrv_goroutine.label routines 
+EOM
+        exit 0;;
+        *)
+printf "strelaysrv_goroutine.value "
+$CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.goNumRoutine'
+    esac
+}
+
+function proxied {
+    case $1 in
+       config)
+            cat <<'EOM'
+graph_title Syncthing relay total proxied bits
+graph_category network
+graph_vlabel bits
+graph_args --base 1000
+strelaysrv_proxied.label bits
+strelaysrv_proxied.cdef strelaysrv_proxied,8,*
+EOM
+            exit 0;;
+	*)
+            printf "strelaysrv_proxied.value "
+            $CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.bytesProxied '
+    esac
+}
+
+function transfer {
+    case $1 in
+       config)
+            cat <<'EOM'
+graph_title Syncthing relay transfer rate
+graph_category network
+graph_vlabel bps
+graph_args --base 1000
+strelaysrv_transfer.label bps
+strelaysrv_transfer.cdef strelaysrv_transfer,1000,*
+EOM
+            exit 0;;
+	*)
+            printf "strelaysrv_transfer.value "
+            $CURL -s http://$STR_HOST:$STR_PORT/status | $JQ '.kbps10s1m5m15m30m60m[2] '
+    esac
+}
+
+cd $(dirname $0)
+
+CURL=$(which curl)
+JQ=$(which jq) 
+
+case $(basename $0) in 
+    strelaysrv_num)
+	num $1
+	exit 0;;
+    strelaysrv_uptime)
+	uptime $1
+	exit 0;;
+    strelaysrv_goroutine)
+	goroutine $1
+	exit 0;;
+    strelaysrv_proxied)
+	proxied $1
+	exit 0;;
+    strelaysrv_transfer)
+	transfer $1
+	exit 0;;
+esac