#!/bin/sh
# Netmon Nodewatcher (C) 2010-2012 Freifunk Oldenburg
# License; GPL v3

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

SCRIPT_ERROR_LEVEL=$(uci get nodewatcher.@script[0].error_level)
SCRIPT_LOGFILE=$(uci get nodewatcher.@script[0].logfile)
SCRIPT_DATA_FILE=$(uci get nodewatcher.@script[0].data_file)

if [ "$SCRIPT_ERROR_LEVEL" -gt "1" ]; then
	debug() {
		echo "$1" >> "$SCRIPT_LOGFILE"
	}
else
	debug() {
		:
	}
fi

#This method checks if the log file has become too big and deletes the first X lines
delete_log() {
	if [ -f "$SCRIPT_LOGFILE" ]; then
		if [ "$(find "$SCRIPT_LOGFILE" -printf "%s")" -gt "6000" ]; then
			sed -i '1,60d' "$SCRIPT_LOGFILE"
			debug "$(date): Logfile has been made smaller"
		fi
	fi
}

#This method generates the crawl data XML file that is being fetched by netmon
#and provided by a small local httpd
crawl() {
	debug "$(date): 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)"
		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

#Prüft ob das logfile zu groß geworden ist
debug "$(date): Check logfile"
delete_log

#Erzeugt die statusdaten
debug "$(date): Generate actual status data"
crawl

exit 0