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https://github.com/Hopiu/linkchecker.git
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fe5a34c68f
Set up the requests.Session() with the complete proxy configuration to fix a problem with using an HTTP server as an HTTPS proxy and potential redirection issues. Requests handles no_proxy.
78 lines
2.9 KiB
Python
78 lines
2.9 KiB
Python
# Copyright (C) 2006-2014 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
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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 objects
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cache_lock = get_lock("robots.txt_cache_lock")
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robot_lock = get_lock("robots.txt_robot_lock")
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class RobotsTxt:
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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, useragent):
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"""Initialize per-URL robots.txt cache."""
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# mapping {URL -> parsed robots.txt}
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self.cache = LFUCache(size=100)
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self.hits = self.misses = 0
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self.roboturl_locks = {}
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self.useragent = useragent
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def allows_url(self, url_data, timeout=None):
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"""Ask robots.txt allowance."""
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roboturl = url_data.get_robots_txt_url()
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with self.get_lock(roboturl):
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return self._allows_url(url_data, roboturl, timeout)
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def _allows_url(self, url_data, roboturl, timeout=None):
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"""Ask robots.txt allowance. Assumes only single thread per robots.txt
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URL calls this function."""
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with cache_lock:
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if roboturl in self.cache:
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self.hits += 1
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rp = self.cache[roboturl]
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return rp.can_fetch(self.useragent, url_data.url)
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self.misses += 1
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kwargs = dict(auth=url_data.auth, session=url_data.session, timeout=timeout)
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rp = robotparser2.RobotFileParser(**kwargs)
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rp.set_url(roboturl)
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rp.read()
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with cache_lock:
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self.cache[roboturl] = rp
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self.add_sitemap_urls(rp, url_data, roboturl)
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return rp.can_fetch(self.useragent, url_data.url)
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def add_sitemap_urls(self, rp, url_data, roboturl):
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"""Add sitemap URLs to queue."""
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if not rp.sitemap_urls or not url_data.allows_simple_recursion():
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return
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for sitemap_url, line in rp.sitemap_urls:
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url_data.add_url(sitemap_url, line=line)
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@synchronized(robot_lock)
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def get_lock(self, roboturl):
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"""Return lock for robots.txt url."""
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return self.roboturl_locks.setdefault(roboturl, get_lock(roboturl))
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