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468 lines
18 KiB
468 lines
18 KiB
"""
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sphinx.builders.linkcheck
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~~~~~~~~~~~~~~~~~~~~~~~~~
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The CheckExternalLinksBuilder class.
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:copyright: Copyright 2007-2020 by the Sphinx team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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import json
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import queue
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import re
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import socket
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import threading
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import time
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from datetime import datetime, timezone
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from email.utils import parsedate_to_datetime
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from html.parser import HTMLParser
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from os import path
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from typing import Any, Dict, List, NamedTuple, Optional, Set, Tuple
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from urllib.parse import unquote, urlparse
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from docutils import nodes
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from docutils.nodes import Node
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from requests import Response
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from requests.exceptions import HTTPError, TooManyRedirects
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from sphinx.application import Sphinx
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from sphinx.builders import Builder
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from sphinx.locale import __
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from sphinx.util import encode_uri, logging, requests
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from sphinx.util.console import darkgray, darkgreen, purple, red, turquoise # type: ignore
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from sphinx.util.nodes import get_node_line
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logger = logging.getLogger(__name__)
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uri_re = re.compile('([a-z]+:)?//') # matches to foo:// and // (a protocol relative URL)
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RateLimit = NamedTuple('RateLimit', (('delay', float), ('next_check', float)))
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DEFAULT_REQUEST_HEADERS = {
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'Accept': 'text/html,application/xhtml+xml;q=0.9,*/*;q=0.8',
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}
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CHECK_IMMEDIATELY = 0
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QUEUE_POLL_SECS = 1
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DEFAULT_DELAY = 60.0
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class AnchorCheckParser(HTMLParser):
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"""Specialized HTML parser that looks for a specific anchor."""
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def __init__(self, search_anchor: str) -> None:
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super().__init__()
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self.search_anchor = search_anchor
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self.found = False
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def handle_starttag(self, tag: Any, attrs: Any) -> None:
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for key, value in attrs:
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if key in ('id', 'name') and value == self.search_anchor:
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self.found = True
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break
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def check_anchor(response: requests.requests.Response, anchor: str) -> bool:
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"""Reads HTML data from a response object `response` searching for `anchor`.
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Returns True if anchor was found, False otherwise.
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"""
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parser = AnchorCheckParser(anchor)
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# Read file in chunks. If we find a matching anchor, we break
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# the loop early in hopes not to have to download the whole thing.
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for chunk in response.iter_content(chunk_size=4096, decode_unicode=True):
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if isinstance(chunk, bytes): # requests failed to decode
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chunk = chunk.decode() # manually try to decode it
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parser.feed(chunk)
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if parser.found:
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break
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parser.close()
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return parser.found
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class CheckExternalLinksBuilder(Builder):
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"""
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Checks for broken external links.
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"""
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name = 'linkcheck'
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epilog = __('Look for any errors in the above output or in '
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'%(outdir)s/output.txt')
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def init(self) -> None:
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self.to_ignore = [re.compile(x) for x in self.app.config.linkcheck_ignore]
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self.anchors_ignore = [re.compile(x)
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for x in self.app.config.linkcheck_anchors_ignore]
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self.auth = [(re.compile(pattern), auth_info) for pattern, auth_info
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in self.app.config.linkcheck_auth]
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self.good = set() # type: Set[str]
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self.broken = {} # type: Dict[str, str]
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self.redirected = {} # type: Dict[str, Tuple[str, int]]
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# set a timeout for non-responding servers
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socket.setdefaulttimeout(5.0)
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# create output file
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open(path.join(self.outdir, 'output.txt'), 'w').close()
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# create JSON output file
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open(path.join(self.outdir, 'output.json'), 'w').close()
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# create queues and worker threads
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self.rate_limits = {} # type: Dict[str, RateLimit]
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self.wqueue = queue.PriorityQueue() # type: queue.PriorityQueue
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self.rqueue = queue.Queue() # type: queue.Queue
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self.workers = [] # type: List[threading.Thread]
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for i in range(self.app.config.linkcheck_workers):
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thread = threading.Thread(target=self.check_thread, daemon=True)
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thread.start()
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self.workers.append(thread)
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def check_thread(self) -> None:
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kwargs = {}
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if self.app.config.linkcheck_timeout:
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kwargs['timeout'] = self.app.config.linkcheck_timeout
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def get_request_headers() -> Dict:
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url = urlparse(uri)
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candidates = ["%s://%s" % (url.scheme, url.netloc),
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"%s://%s/" % (url.scheme, url.netloc),
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uri,
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"*"]
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for u in candidates:
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if u in self.config.linkcheck_request_headers:
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headers = dict(DEFAULT_REQUEST_HEADERS)
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headers.update(self.config.linkcheck_request_headers[u])
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return headers
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return {}
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def check_uri() -> Tuple[str, str, int]:
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# split off anchor
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if '#' in uri:
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req_url, anchor = uri.split('#', 1)
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for rex in self.anchors_ignore:
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if rex.match(anchor):
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anchor = None
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break
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else:
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req_url = uri
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anchor = None
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# handle non-ASCII URIs
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try:
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req_url.encode('ascii')
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except UnicodeError:
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req_url = encode_uri(req_url)
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# Get auth info, if any
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for pattern, auth_info in self.auth:
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if pattern.match(uri):
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break
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else:
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auth_info = None
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# update request headers for the URL
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kwargs['headers'] = get_request_headers()
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try:
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if anchor and self.app.config.linkcheck_anchors:
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# Read the whole document and see if #anchor exists
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response = requests.get(req_url, stream=True, config=self.app.config,
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auth=auth_info, **kwargs)
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response.raise_for_status()
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found = check_anchor(response, unquote(anchor))
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if not found:
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raise Exception(__("Anchor '%s' not found") % anchor)
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else:
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try:
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# try a HEAD request first, which should be easier on
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# the server and the network
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response = requests.head(req_url, allow_redirects=True,
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config=self.app.config, auth=auth_info,
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**kwargs)
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response.raise_for_status()
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except (HTTPError, TooManyRedirects) as err:
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if isinstance(err, HTTPError) and err.response.status_code == 429:
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raise
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# retry with GET request if that fails, some servers
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# don't like HEAD requests.
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response = requests.get(req_url, stream=True,
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config=self.app.config,
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auth=auth_info, **kwargs)
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response.raise_for_status()
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except HTTPError as err:
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if err.response.status_code == 401:
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# We'll take "Unauthorized" as working.
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return 'working', ' - unauthorized', 0
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elif err.response.status_code == 429:
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next_check = self.limit_rate(err.response)
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if next_check is not None:
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self.wqueue.put((next_check, uri, docname, lineno), False)
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return 'rate-limited', '', 0
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return 'broken', str(err), 0
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elif err.response.status_code == 503:
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# We'll take "Service Unavailable" as ignored.
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return 'ignored', str(err), 0
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else:
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return 'broken', str(err), 0
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except Exception as err:
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return 'broken', str(err), 0
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else:
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netloc = urlparse(req_url).netloc
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try:
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del self.rate_limits[netloc]
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except KeyError:
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pass
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if response.url.rstrip('/') == req_url.rstrip('/'):
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return 'working', '', 0
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else:
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new_url = response.url
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if anchor:
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new_url += '#' + anchor
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# history contains any redirects, get last
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if response.history:
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code = response.history[-1].status_code
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return 'redirected', new_url, code
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else:
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return 'redirected', new_url, 0
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def check(docname: str) -> Tuple[str, str, int]:
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# check for various conditions without bothering the network
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if len(uri) == 0 or uri.startswith(('#', 'mailto:', 'tel:')):
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return 'unchecked', '', 0
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elif not uri.startswith(('http:', 'https:')):
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if uri_re.match(uri):
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# non supported URI schemes (ex. ftp)
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return 'unchecked', '', 0
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else:
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srcdir = path.dirname(self.env.doc2path(docname))
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if path.exists(path.join(srcdir, uri)):
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return 'working', '', 0
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else:
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for rex in self.to_ignore:
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if rex.match(uri):
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return 'ignored', '', 0
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else:
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self.broken[uri] = ''
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return 'broken', '', 0
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elif uri in self.good:
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return 'working', 'old', 0
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elif uri in self.broken:
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return 'broken', self.broken[uri], 0
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elif uri in self.redirected:
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return 'redirected', self.redirected[uri][0], self.redirected[uri][1]
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for rex in self.to_ignore:
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if rex.match(uri):
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return 'ignored', '', 0
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# need to actually check the URI
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for _ in range(self.app.config.linkcheck_retries):
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status, info, code = check_uri()
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if status != "broken":
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break
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if status == "working":
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self.good.add(uri)
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elif status == "broken":
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self.broken[uri] = info
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elif status == "redirected":
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self.redirected[uri] = (info, code)
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return (status, info, code)
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while True:
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next_check, uri, docname, lineno = self.wqueue.get()
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if uri is None:
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break
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netloc = urlparse(uri).netloc
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try:
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# Refresh rate limit.
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# When there are many links in the queue, workers are all stuck waiting
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# for responses, but the builder keeps queuing. Links in the queue may
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# have been queued before rate limits were discovered.
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next_check = self.rate_limits[netloc].next_check
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except KeyError:
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pass
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if next_check > time.time():
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# Sleep before putting message back in the queue to avoid
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# waking up other threads.
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time.sleep(QUEUE_POLL_SECS)
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self.wqueue.put((next_check, uri, docname, lineno), False)
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self.wqueue.task_done()
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continue
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status, info, code = check(docname)
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if status == 'rate-limited':
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logger.info(darkgray('-rate limited- ') + uri + darkgray(' | sleeping...'))
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else:
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self.rqueue.put((uri, docname, lineno, status, info, code))
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self.wqueue.task_done()
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def limit_rate(self, response: Response) -> Optional[float]:
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next_check = None
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retry_after = response.headers.get("Retry-After")
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if retry_after:
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try:
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# Integer: time to wait before next attempt.
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delay = float(retry_after)
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except ValueError:
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try:
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# An HTTP-date: time of next attempt.
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until = parsedate_to_datetime(retry_after)
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except (TypeError, ValueError):
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# TypeError: Invalid date format.
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# ValueError: Invalid date, e.g. Oct 52th.
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pass
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else:
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next_check = datetime.timestamp(until)
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delay = (until - datetime.now(timezone.utc)).total_seconds()
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else:
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next_check = time.time() + delay
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netloc = urlparse(response.url).netloc
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if next_check is None:
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max_delay = self.app.config.linkcheck_rate_limit_timeout
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try:
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rate_limit = self.rate_limits[netloc]
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except KeyError:
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delay = DEFAULT_DELAY
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else:
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last_wait_time = rate_limit.delay
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delay = 2.0 * last_wait_time
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if delay > max_delay and last_wait_time < max_delay:
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delay = max_delay
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if delay > max_delay:
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return None
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next_check = time.time() + delay
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self.rate_limits[netloc] = RateLimit(delay, next_check)
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return next_check
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def process_result(self, result: Tuple[str, str, int, str, str, int]) -> None:
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uri, docname, lineno, status, info, code = result
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filename = self.env.doc2path(docname, None)
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linkstat = dict(filename=filename, lineno=lineno,
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status=status, code=code, uri=uri,
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info=info)
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if status == 'unchecked':
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self.write_linkstat(linkstat)
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return
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if status == 'working' and info == 'old':
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self.write_linkstat(linkstat)
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return
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if lineno:
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logger.info('(line %4d) ', lineno, nonl=True)
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if status == 'ignored':
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if info:
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logger.info(darkgray('-ignored- ') + uri + ': ' + info)
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else:
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logger.info(darkgray('-ignored- ') + uri)
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self.write_linkstat(linkstat)
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elif status == 'local':
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logger.info(darkgray('-local- ') + uri)
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self.write_entry('local', docname, filename, lineno, uri)
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self.write_linkstat(linkstat)
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elif status == 'working':
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logger.info(darkgreen('ok ') + uri + info)
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self.write_linkstat(linkstat)
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elif status == 'broken':
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if self.app.quiet or self.app.warningiserror:
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logger.warning(__('broken link: %s (%s)'), uri, info,
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location=(filename, lineno))
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else:
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logger.info(red('broken ') + uri + red(' - ' + info))
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self.write_entry('broken', docname, filename, lineno, uri + ': ' + info)
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self.write_linkstat(linkstat)
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elif status == 'redirected':
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try:
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text, color = {
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301: ('permanently', purple),
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302: ('with Found', purple),
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303: ('with See Other', purple),
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307: ('temporarily', turquoise),
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308: ('permanently', purple),
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}[code]
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except KeyError:
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text, color = ('with unknown code', purple)
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linkstat['text'] = text
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logger.info(color('redirect ') + uri + color(' - ' + text + ' to ' + info))
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self.write_entry('redirected ' + text, docname, filename,
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lineno, uri + ' to ' + info)
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self.write_linkstat(linkstat)
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def get_target_uri(self, docname: str, typ: str = None) -> str:
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return ''
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def get_outdated_docs(self) -> Set[str]:
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return self.env.found_docs
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def prepare_writing(self, docnames: Set[str]) -> None:
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return
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def write_doc(self, docname: str, doctree: Node) -> None:
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logger.info('')
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n = 0
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# reference nodes
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for refnode in doctree.traverse(nodes.reference):
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if 'refuri' not in refnode:
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continue
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uri = refnode['refuri']
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lineno = get_node_line(refnode)
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uri_info = (CHECK_IMMEDIATELY, uri, docname, lineno)
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self.wqueue.put(uri_info, False)
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n += 1
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# image nodes
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for imgnode in doctree.traverse(nodes.image):
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uri = imgnode['candidates'].get('?')
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if uri and '://' in uri:
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lineno = get_node_line(imgnode)
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uri_info = (CHECK_IMMEDIATELY, uri, docname, lineno)
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self.wqueue.put(uri_info, False)
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n += 1
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done = 0
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while done < n:
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self.process_result(self.rqueue.get())
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done += 1
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if self.broken:
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self.app.statuscode = 1
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def write_entry(self, what: str, docname: str, filename: str, line: int,
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uri: str) -> None:
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with open(path.join(self.outdir, 'output.txt'), 'a') as output:
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output.write("%s:%s: [%s] %s\n" % (filename, line, what, uri))
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def write_linkstat(self, data: dict) -> None:
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with open(path.join(self.outdir, 'output.json'), 'a') as output:
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output.write(json.dumps(data))
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output.write('\n')
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def finish(self) -> None:
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self.wqueue.join()
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# Shutdown threads.
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for worker in self.workers:
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self.wqueue.put((CHECK_IMMEDIATELY, None, None, None), False)
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def setup(app: Sphinx) -> Dict[str, Any]:
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app.add_builder(CheckExternalLinksBuilder)
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app.add_config_value('linkcheck_ignore', [], None)
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app.add_config_value('linkcheck_auth', [], None)
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app.add_config_value('linkcheck_request_headers', {}, None)
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app.add_config_value('linkcheck_retries', 1, None)
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app.add_config_value('linkcheck_timeout', None, None, [int])
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app.add_config_value('linkcheck_workers', 5, None)
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app.add_config_value('linkcheck_anchors', True, None)
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# Anchors starting with ! are ignored since they are
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# commonly used for dynamic pages
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app.add_config_value('linkcheck_anchors_ignore', ["^!"], None)
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app.add_config_value('linkcheck_rate_limit_timeout', 300.0, None)
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return {
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'version': 'builtin',
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'parallel_read_safe': True,
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'parallel_write_safe': True,
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}
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