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#!/usr/bin/env python3
"""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 3 193.35.52.{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(f"Finished resolving {ip}")
return info[0]
except Exception:
print(f"Failed resolving {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 = [f"193.35.52.{i}" for i in range(1, 50)]
run(10, *ips)
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