#!/bin/sh
# SPDX-License-Identifier: GPL-3.0-only
#
# Netmon Nodewatcher (C) 2010-2012 Freifunk Oldenburg

test -f /tmp/started || exit

# Allow only one instance
lockfile="/var/lock/${0##*/}.lock"
if ! lock -n "$lockfile"; then
	echo "Only one instance of $0 allowed."
	exit 1
fi
trap "lock -u \"$lockfile\"" INT TERM EXIT

[ -s /etc/config/nodewatcher ] || exit 1
[ "$(uci get nodewatcher.@script[0].disabled)" = "1" ] && exit 0

SCRIPT_DATA_FILE=$(uci get nodewatcher.@script[0].data_file)

debug() {
	(>&2 echo "nodewatcher: $1")
}

#This method generates the crawl data XML file that is being fetched by netmon
#and provided by a small local httpd
crawl() {
	debug "Putting all information into a XML-File and save it at $SCRIPT_DATA_FILE"

	DATA="<?xml version='1.0' standalone='yes'?><data>"

	for f in /usr/lib/nodewatcher.d/*.sh; do
		tmp="$($f)"
		if [ $? -ne 0 ]; then
			debug "Error when executing subscript $f, exiting!"
			exit 1
		fi
		DATA="$DATA$tmp"
	done

	DATA="$DATA</data>"

	#write data to xml file that provides the data on httpd
	SCRIPT_DATA_DIR=$(dirname "$SCRIPT_DATA_FILE")
	test -d "$SCRIPT_DATA_DIR" || mkdir -p "$SCRIPT_DATA_DIR"
	echo "$DATA" | gzip | tee "$SCRIPT_DATA_FILE" | alfred -s 64
}

LANG=C

#Erzeugt die statusdaten
debug "Generate actual status data"
crawl

exit 0