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112 lines
3.8 KiB
Python
112 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2017 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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"""Downloader module for http:// and https:// URLs"""
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import time
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import requests.exceptions as rexcepts
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import mimetypes
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import logging
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from .common import BasicDownloader
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from .. import config, util
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log = logging.getLogger("http")
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class Downloader(BasicDownloader):
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retries = config.interpolate(("downloader", "http", "retries",), 5)
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timeout = config.interpolate(("downloader", "http", "timeout",), 30)
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verify = config.interpolate(("downloader", "http", "verify",), True)
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def __init__(self, session, output):
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BasicDownloader.__init__(self)
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self.session = session
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self.out = output
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def download_impl(self, url, pathfmt):
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partial = False
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tries = 0
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msg = ""
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while True:
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tries += 1
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if tries > 1:
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self.out.error(pathfmt.path, msg, tries-1, self.retries)
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if tries > self.retries:
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return
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time.sleep(1)
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# try to connect to remote source
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try:
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response = self.session.get(
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url, stream=True, timeout=self.timeout, verify=self.verify,
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)
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except (rexcepts.ConnectionError, rexcepts.Timeout) as exception:
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msg = exception
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continue
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except (rexcepts.RequestException, UnicodeError) as exception:
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msg = exception
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break
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# reject error-status-codes
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if response.status_code not in (200, 206):
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msg = 'HTTP status "{} {}"'.format(
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response.status_code, response.reason
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)
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response.close()
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if response.status_code == 404:
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break
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continue
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if not pathfmt.has_extension:
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# set 'extension' keyword from Content-Type header
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mtype = response.headers.get("Content-Type", "image/jpeg")
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mtype = mtype.partition(";")[0]
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exts = mimetypes.guess_all_extensions(mtype, strict=False)
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if exts:
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exts.sort()
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pathfmt.set_extension(exts[-1][1:])
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else:
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log.warning("No file extension found for MIME type '%s'",
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mtype)
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pathfmt.set_extension("txt")
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if pathfmt.exists():
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self.out.skip(pathfmt.path)
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response.close()
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return
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#
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if partial and "Content-Range" in response.headers:
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size = response.headers["Content-Range"].rpartition("/")[2]
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else:
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size = response.headers.get("Content-Length")
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size = util.safe_int(size)
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# everything ok -- proceed to download
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self.out.start(pathfmt.path)
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self.downloading = True
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try:
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with pathfmt.open() as file:
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for data in response.iter_content(16384):
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file.write(data)
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if size and file.tell() != size:
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msg = "filesize mismatch ({} != {})".format(
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file.tell(), size)
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continue
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except rexcepts.RequestException as exception:
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msg = exception
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response.close()
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continue
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self.downloading = False
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self.out.success(pathfmt.path, tries)
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return
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# output for unrecoverable errors
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self.out.error(pathfmt.path, msg, tries, 0)
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