mirror of
https://github.com/Hopiu/linkchecker.git
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79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2006-2012 Bastian Kleineidam
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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Cache for DNS lookups.
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"""
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import socket
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import sys
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from .. import LinkCheckerError
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from ..lock import get_lock
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from ..containers import LFUCache
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from ..decorators import synchronized
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_lock = get_lock("addrinfo")
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class AddrInfo(object):
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def __init__(self):
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"""Initialize address info cache and cache statistics."""
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self.addrinfos = LFUCache(size=100)
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self.misses = self.hits = 0
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def getaddrinfo(self, host, port):
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"""Determine address information for given host and port for
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streaming sockets (SOCK_STREAM).
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Already cached information is used."""
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key = u"%s:%s" % (unicode(host), unicode(port))
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if key in self.addrinfos:
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self.hits += 1
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value = self.addrinfos[key]
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else:
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self.misses += 1
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# check if it's an ascii host
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if isinstance(host, unicode):
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try:
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host = host.encode('ascii')
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except UnicodeEncodeError:
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pass
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try:
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value = socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM)
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except socket.error:
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value = sys.exc_info()[1]
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except UnicodeError, msg:
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args = dict(host=host, msg=str(msg))
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value = LinkCheckerError(_("could not parse host %(host)r: %(msg)s") % args)
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self.addrinfos[key] = value
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if isinstance(value, Exception):
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raise value
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return value
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_addrinfo = AddrInfo()
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@synchronized(_lock)
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def getaddrinfo(host, port):
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"""Determine address information for given host and port for
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streaming sockets (SOCK_STREAM).
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Already cached information is used."""
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return _addrinfo.getaddrinfo(host, port)
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@synchronized(_lock)
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def getstats():
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"""Get cache statistics.
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@return: hits and misses
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@rtype tuple(int, int)
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"""
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return _addrinfo.hits, _addrinfo.misses
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