mirror of
https://github.com/Hopiu/linkchecker.git
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106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2000-2010 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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Handle nntp: and news: links.
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"""
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import re
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import time
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import nntplib
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import random
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from . import urlbase
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from .. import log, LinkCheckerError, LOG_CHECK
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from .const import WARN_NNTP_NO_SERVER, WARN_NNTP_NO_NEWSGROUP
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random.seed()
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class NntpUrl (urlbase.UrlBase):
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"""
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Url link with NNTP scheme.
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"""
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def check_connection (self):
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"""
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Connect to NNTP server and try to request the URL article
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resource (if specified).
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"""
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nntpserver = self.host or self.aggregate.config["nntpserver"]
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if not nntpserver:
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self.add_warning(
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_("No NNTP server was specified, skipping this URL."),
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tag=WARN_NNTP_NO_SERVER)
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return
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nntp = self._connect_nntp(nntpserver)
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group = self.urlparts[2]
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while group[:1] == '/':
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group = group[1:]
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if '@' in group:
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# request article info (resp, number mid)
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number = nntp.stat("<"+group+">")[1]
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self.add_info(_('Article number %(num)s found.') % {"num": number})
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else:
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# split off trailing articel span
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group = group.split('/', 1)[0]
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if group:
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# request group info (resp, count, first, last, name)
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name = nntp.group(group)[4]
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self.add_info(_("News group %(name)s found.") % {"name": name})
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else:
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# group name is the empty string
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self.add_warning(_("No newsgroup specified in NNTP URL."),
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tag=WARN_NNTP_NO_NEWSGROUP)
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def _connect_nntp (self, nntpserver):
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"""
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This is done only once per checking task. Also, the newly
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introduced error codes 504 and 505 (both inclining "Too busy, retry
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later", are caught.
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"""
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tries = 0
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nntp = value = None
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while tries < 2:
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tries += 1
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try:
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nntp = nntplib.NNTP(nntpserver, usenetrc=False)
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except nntplib.NNTPTemporaryError:
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self.wait()
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except nntplib.NNTPPermanentError, msg:
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if re.compile("^50[45]").search(str(msg)):
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self.wait()
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else:
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raise
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if nntp is None:
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raise LinkCheckerError(
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_("NNTP server too busy; tried more than %d times.") % tries)
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if log.is_debug(LOG_CHECK):
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nntp.set_debuglevel(1)
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self.add_info(nntp.getwelcome())
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return nntp
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def wait (self):
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"""Wait some time before trying to connect again."""
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time.sleep(random.randrange(10, 30))
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def can_get_content (self):
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"""
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NNTP urls have no content.
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@return: False
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@rtype: bool
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"""
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return False
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