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# -*- coding: utf-8 -*-
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Author: Mauro Soria
from socket import getaddrinfo
_dns_cache = {}
def cache_dns(domain, port, addr):
_dns_cache[domain, port] = getaddrinfo(addr, port)
def cached_getaddrinfo(*args, **kwargs):
"""
Replacement for socket.getaddrinfo, they are the same but this function
does cache the answer to improve the performance
"""
host, port = args[:2]
if (host, port) not in _dns_cache:
_dns_cache[host, port] = getaddrinfo(*args, **kwargs)
return _dns_cache[host, port]
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