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132 lines
3.2 KiB
132 lines
3.2 KiB
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 Mike Fährmann
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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 version 2 as
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# published by the Free Software Foundation.
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"""Common classes and constants used by extractor modules."""
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import time
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import queue
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import requests
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import threading
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import html.parser
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class Message():
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Version = 1
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Directory = 2
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Url = 3
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Headers = 4
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Cookies = 5
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class Extractor():
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def __init__(self):
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self.session = requests.Session()
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def __iter__(self):
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return self.items()
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def items(self):
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yield Message.Version, 1
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return
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def request(self, url, *args, **kwargs):
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return safe_request(self.session, url, *args, **kwargs)
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def enable_useragent(self):
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self.session.headers["User-Agent"] = (
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"Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Firefox/24.0"
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)
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@staticmethod
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def extract(txt, begin, end, pos=0):
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try:
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first = txt.index(begin, pos) + len(begin)
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last = txt.index(end, first)
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return txt[first:last], last+len(end)
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except ValueError:
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return None, pos
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@staticmethod
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def extract_all(txt, begin, end, pos=0):
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try:
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first = txt.index(begin, pos)
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last = txt.index(end, first + len(begin)) + len(end)
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return txt[first:last], last
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except ValueError:
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return None, pos
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class SequentialExtractor(Extractor):
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def __init__(self, _):
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Extractor.__init__(self)
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class AsynchronousExtractor(Extractor):
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def __init__(self, config):
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Extractor.__init__(self)
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queue_size = int(config.get("general", "queue-size", fallback=5))
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self.__queue = queue.Queue(maxsize=queue_size)
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self.__thread = threading.Thread(target=self.async_items, daemon=True)
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def __iter__(self):
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get = self.__queue.get
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done = self.__queue.task_done
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self.__thread.start()
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while True:
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task = get()
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if task is None:
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return
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yield task
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done()
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def async_items(self):
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put = self.__queue.put
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try:
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for task in self.items():
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put(task)
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except Exception:
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import traceback
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print(traceback.format_exc())
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put(None)
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def safe_request(session, url, method="GET", *args, **kwargs):
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tries = 0
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while True:
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# try to connect to remote source
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try:
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r = session.request(method, url, *args, **kwargs)
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except requests.exceptions.ConnectionError:
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tries += 1
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time.sleep(1)
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if tries == 5:
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raise
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continue
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# reject error-status-codes
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if r.status_code != requests.codes.ok:
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tries += 1
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time.sleep(1)
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if tries == 5:
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r.raise_for_status()
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continue
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# everything ok -- proceed to download
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return r
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def filename_from_url(url):
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pos = url.rfind("/")
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return url[pos+1:]
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unescape = html.parser.HTMLParser().unescape
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