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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | #! /usr/bin/env python
"""
Resolve a bunch of IP addresses using a pool of resolver actors.
Based on example contributed by Kristian Klette <klette@klette.us>.
Either run without arguments:
./resolver.py
Or specify pool size and IPs to resolve:
./resolver.py 3 129.240.2.{1,2,3,4,5,6,7,8,9}
"""
import pprint
import socket
import sys
import pykka
class Resolver(pykka.ThreadingActor):
def resolve(self, ip):
try:
info = socket.gethostbyaddr(ip)
print('Finished resolving {}'.format(ip))
return info[0]
except:
print('Failed resolving {}'.format(ip))
return None
def run(pool_size, *ips):
# Start resolvers
resolvers = [Resolver.start().proxy() for _ in range(pool_size)]
# Distribute work by mapping IPs to resolvers (not blocking)
hosts = []
for i, ip in enumerate(ips):
hosts.append(resolvers[i % len(resolvers)].resolve(ip))
# Gather results (blocking)
ip_to_host = zip(ips, pykka.get_all(hosts))
pprint.pprint(list(ip_to_host))
# Clean up
pykka.ActorRegistry.stop_all()
if __name__ == '__main__':
if len(sys.argv[1:]) >= 2:
run(int(sys.argv[1]), *sys.argv[2:])
else:
ips = ['129.241.93.%s' % i for i in range(1, 50)]
run(10, *ips)
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