mirror of
https://github.com/Hopiu/linkchecker.git
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58 lines
2 KiB
Python
58 lines
2 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2006-2010 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 robots.txt contents.
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"""
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from .. import robotparser2, configuration, url as urlutil
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from ..containers import LFUCache
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from ..decorators import synchronized
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from ..lock import get_lock
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# lock for caching
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_lock = get_lock("robots.txt")
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class RobotsTxt (object):
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"""
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Thread-safe cache of downloaded robots.txt files.
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format: {cache key (string) -> robots.txt content (RobotFileParser)}
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"""
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def __init__ (self):
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self.cache = LFUCache(size=100)
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@synchronized(_lock)
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def allows_url (self, roboturl, url, proxy, user, password, callback=None):
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"""
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Ask robots.txt allowance.
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"""
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useragent = str(configuration.UserAgent)
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if roboturl not in self.cache:
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rp = robotparser2.RobotFileParser(proxy=proxy, user=user,
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password=password)
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rp.set_url(roboturl)
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rp.read()
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if hasattr(callback, '__call__'):
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parts = urlutil.url_split(rp.url)
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host = "%s:%d" % (parts[1], parts[2])
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wait = rp.get_crawldelay(useragent)
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callback(host, wait)
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self.cache[roboturl] = rp
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else:
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rp = self.cache[roboturl]
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return rp.can_fetch(useragent, url)
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