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80 lines
2.1 KiB
Python
80 lines
2.1 KiB
Python
# Fakultät für Mathematik (FfM)
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import aiohttp
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import asyncio
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import bs4
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import logging
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import pathlib
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import re
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from .organizer import Organizer
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from . import utils
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__all__ = [
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"FfM",
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]
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logger = logging.getLogger(__name__)
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class FfM:
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BASE_URL = "http://www.math.kit.edu/"
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LINK_RE = re.compile(r"^https?://www.math.kit.edu/.*/(.*\.pdf)$")
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RETRY_ATTEMPTS = 5
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RETRY_DELAY = 1 # seconds
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def __init__(self, base_path):
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self.base_path = base_path
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self._session = aiohttp.ClientSession()
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async def synchronize(self, urlpart, to_dir, transform=lambda x: x):
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logging.info(f" Synchronizing {urlpart} to {to_dir} using the FfM synchronizer.")
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sync_path = pathlib.Path(self.base_path, to_dir)
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orga = Organizer(self.base_path, sync_path)
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orga.clean_temp_dir()
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await self._crawl(orga, urlpart, transform)
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orga.clean_sync_dir()
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orga.clean_temp_dir()
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async def close(self):
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await self._session.close()
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async def _crawl(self, orga, urlpart, transform):
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url = self.BASE_URL + urlpart
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async with self._session.get(url) as resp:
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text = await resp.text()
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soup = bs4.BeautifulSoup(text, "html.parser")
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for found in soup.find_all("a", href=self.LINK_RE):
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url = found["href"]
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filename = re.match(self.LINK_RE, url).group(1)
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logger.debug(f"Found file {filename} at {url}")
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old_path = pathlib.PurePath(filename)
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new_path = transform(old_path)
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if new_path is None:
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continue
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logger.debug(f"Transformed from {old_path} to {new_path}")
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temp_path = orga.temp_file()
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await self._download(url, temp_path)
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orga.add_file(temp_path, new_path)
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async def _download(self, url, to_path):
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for t in range(self.RETRY_ATTEMPTS):
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try:
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async with self._session.get(url) as resp:
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await utils.stream_to_path(resp, to_path)
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except aiohttp.client_exceptions.ServerDisconnectedError:
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logger.debug(f"Try {t+1} out of {self.RETRY_ATTEMPTS} failed, retrying in {self.RETRY_DELAY} s")
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await asyncio.sleep(self.RETRY_DELAY)
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else:
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return
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else:
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logger.error(f"Could not download {url}")
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raise utils.OutOfTriesException(f"Try {self.RETRY_ATTEMPTS} out of {self.RETRY_ATTEMPTS} failed.")
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