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#!/usr/bin/python
"""Resolve hostnames concurrently, exit after 2 seconds.
Under the hood, this might use an asynchronous resolver based on
c-ares (the default) or thread-pool-based resolver.
You can choose between resolvers using GEVENT_RESOLVER environment
variable. To enable threading resolver:
GEVENT_RESOLVER=thread python dns_mass_resolve.py
"""
from __future__ import with_statement
import sys
import gevent
from gevent import socket
from gevent.pool import Pool
N = 1000
# limit ourselves to max 10 simultaneous outstanding requests
pool = Pool(10)
finished = 0
def job(url):
global finished
try:
try:
ip = socket.gethostbyname(url)
print ('%s = %s' % (url, ip))
except socket.gaierror:
ex = sys.exc_info()[1]
print ('%s failed with %s' % (url, ex))
finally:
finished += 1
with gevent.Timeout(2, False):
for x in xrange(10, 10 + N):
pool.spawn(job, '%s.com' % x)
pool.join()
print ('finished within 2 seconds: %s/%s' % (finished, N))
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