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#!/usr/bin/python
"""Resolve hostnames concurrently, exit after 2 seconds.
Note, that gevent.socket.gethostname uses libevent-dns under the hood
and yields the control to other greenlets until the result is ready.
This script splits the job between a number of greenlets to get the
results faster.
"""
from __future__ import with_statement
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:
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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