#!/bin/sh

source $(dirname $0)/traffic_common.sh	

# update traffic counters
TCur=$((
	$(ip -s link show $IF \
	| awk '{ if (FNR == 4) print $1 " + "; if (FNR == 6) print $1 }' \
	| tr -d "\n")
	))
# test for invalid cur values (negative number or invalid number format (ret=2))
if [ "$TCur" -lt 0 ] 2>/dev/null || [ $? -eq 2 ]; then
	# TODO: log error
	exit -1
fi
UpdatePer=false
if [ $TCur -lt $TObs ]; then
	# interface counter has been reset
	TEph=$(($TEph + $TCur))
	# TODO: log warning
else
	TEph=$(($TEph + $TCur - $TObs))
fi
TObs=$TCur
TPer=$(($TPer + $TEph))
if [ $TEph -gt $MaxPerTrafficDiff ]; then
        # TODO: log _once_ if TPer exceeds TMax
	TEph=0
	echo $TPer > $TPerFile
fi
echo $TEph > $TEphFile
echo $TObs > $TObsFile

# act if traffic max is reached
if [ $TPer -gt $TMax ]; then
	tc qdisc add dev $IF root tbf rate 80kbit latency 50ms burst 3000
else
	tc qdisc del dev $IF root
fi