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#!/bin/bash
#
# This script is run by the policy closed loop to generate traffic (DNS packets) to the DNS
#
# Usage: dnstraffic.sh <DNSIP> <RATE_PER_SEC> <ITERATIONS>
#
# The DNSIP is that of the DNS vLoadBalancer.
# The RATE_PER_SEC is the approximate number of nslookup requests generated per second.
# The ITERATIONS is roughly the number of seconds to run the test. Note that the Robot
# will kill this script after the validation is complete.
#
# The validation portion of the script has done a successful lookup, so the point of
# these requests is to generate DNS packets. We do not care about the results. The timeout
# of 1 second is to ensure we do not flood the process table with long waits
# on failed lookups.
#
# We generate an approximate rate because we sleep for a full second so the RATE_PER_SEC
# should have some slop in it. We only need to drive this to 20+ per second, so a 35
# per second should fall within the range to trigger the polciy check and prvide enough
# to validate even distribution without spawning a 3rd DNS
#
DNSIP=$1
RATE_PER_SEC=$2
ITERATIONS=$3
ITERATIONS=${ITERATIONS:-300}
for iter in `seq 1 $ITERATIONS`;
do
for i in `seq 1 $RATE_PER_SEC`;
do
nslookup -timeout=1 host2.dnsdemo.onap.org $DNSIP >/dev/null 2>&1 &
done
sleep 1
done
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