DNS resolver for T115194
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Authored by hashar on Apr 28 2016, 11:19 AM.

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	F3941884: DNS resolver for T115194
	Apr 28 2016, 11:19 AM

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	#!/usr/bin/env python2

	import argparse
	import dns.resolver
	from time import sleep

	p = argparse.ArgumentParser()
	p.add_argument('--delay', type=float, default=1.0,
	help='Delay between DNS queries')
	p.add_argument('range', help='Range of ID. Ex: 85-90')
	opts = p.parse_args()

	try:
	(start, stop) = [int(border) for border in opts.range.split('-')]
	except ValueError:
	p.error("Invalid range should be: <start>-<end>")

	fqdn_template = 'ci-jessie-wikimedia-%s.contintcloud.eqiad.wmflabs.'

	print "Start: %s" % (fqdn_template % start)
	print "Stop: %s" % (fqdn_template % stop)

	print "Querying DNS for A records ..."
	for index, host_id in enumerate(xrange(start, stop), start=1):
	fqdn = fqdn_template % host_id
	try:
	answers = dns.resolver.query(fqdn, 'A')
	print "Found %s" % fqdn
	except dns.resolver.NXDOMAIN:
	continue
	finally:
	sleep(opts.delay)
	print "Did %s queries. Done." % index

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