Add infrastructure for paged lists
This commit allows to download pages in playlists as needed instead of all at once.
Before this commit,
youtube-dl http://www.youtube.com/user/ANNnewsCH/videos --playlist-end 2 --skip-download
took quite some time - now it's almost instantaneous.
As an example, the youtube:user extractor has been converted.
Fixes #2175
This commit is contained in:
Philipp Hagemeister
parent
c91778f8c0
commit
b7ab059084
@ -18,6 +18,7 @@ from youtube_dl.utils import (
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find_xpath_attr,
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get_meta_content,
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orderedSet,
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PagedList,
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parse_duration,
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sanitize_filename,
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shell_quote,
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@ -200,5 +201,26 @@ class TestUtil(unittest.TestCase):
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self.assertEqual(parse_duration('9:12:43'), 33163)
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self.assertEqual(parse_duration('x:y'), None)
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def test_paged_list(self):
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def testPL(size, pagesize, sliceargs, expected):
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def get_page(pagenum):
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firstid = pagenum * pagesize
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upto = min(size, pagenum * pagesize + pagesize)
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for i in range(firstid, upto):
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yield i
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pl = PagedList(get_page, pagesize)
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got = pl.getslice(*sliceargs)
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self.assertEqual(got, expected)
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testPL(5, 2, (), [0, 1, 2, 3, 4])
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testPL(5, 2, (1,), [1, 2, 3, 4])
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testPL(5, 2, (2,), [2, 3, 4])
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testPL(5, 2, (4,), [4])
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testPL(5, 2, (0, 3), [0, 1, 2])
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testPL(5, 2, (1, 4), [1, 2, 3])
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testPL(5, 2, (2, 99), [2, 3, 4])
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testPL(5, 2, (20, 99), [])
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if __name__ == '__main__':
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unittest.main()
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@ -39,6 +39,7 @@ from .utils import (
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locked_file,
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make_HTTPS_handler,
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MaxDownloadsReached,
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PagedList,
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PostProcessingError,
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platform_name,
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preferredencoding,
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@ -575,19 +576,27 @@ class YoutubeDL(object):
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playlist_results = []
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n_all_entries = len(ie_result['entries'])
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playliststart = self.params.get('playliststart', 1) - 1
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playlistend = self.params.get('playlistend', None)
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# For backwards compatibility, interpret -1 as whole list
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if playlistend == -1:
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playlistend = None
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if isinstance(ie_result['entries'], list):
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n_all_entries = len(ie_result['entries'])
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entries = ie_result['entries'][playliststart:playlistend]
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n_entries = len(entries)
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self.to_screen(
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"[%s] playlist '%s': Collected %d video ids (downloading %d of them)" %
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"[%s] playlist %s: Collected %d video ids (downloading %d of them)" %
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(ie_result['extractor'], playlist, n_all_entries, n_entries))
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else:
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assert isinstance(ie_result['entries'], PagedList)
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entries = ie_result['entries'].getslice(
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playliststart, playlistend)
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n_entries = len(entries)
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self.to_screen(
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"[%s] playlist %s: Downloading %d videos" %
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(ie_result['extractor'], playlist, n_entries))
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for i, entry in enumerate(entries, 1):
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self.to_screen('[download] Downloading video #%s of %s' % (i, n_entries))
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@ -27,6 +27,7 @@ from ..utils import (
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get_element_by_id,
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get_element_by_attribute,
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ExtractorError,
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PagedList,
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RegexNotFoundError,
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unescapeHTML,
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unified_strdate,
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@ -1580,44 +1581,35 @@ class YoutubeUserIE(InfoExtractor):
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# page by page until there are no video ids - it means we got
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# all of them.
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url_results = []
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for pagenum in itertools.count(0):
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def download_page(pagenum):
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start_index = pagenum * self._GDATA_PAGE_SIZE + 1
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gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
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page = self._download_webpage(gdata_url, username,
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u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
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page = self._download_webpage(
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gdata_url, username,
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u'Downloading video ids from %d to %d' % (
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start_index, start_index + self._GDATA_PAGE_SIZE))
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try:
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response = json.loads(page)
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except ValueError as err:
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raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
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if 'entry' not in response['feed']:
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# Number of videos is a multiple of self._MAX_RESULTS
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break
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return
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# Extract video identifiers
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entries = response['feed']['entry']
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for entry in entries:
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title = entry['title']['$t']
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video_id = entry['id']['$t'].split('/')[-1]
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url_results.append({
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yield {
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'_type': 'url',
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'url': video_id,
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'ie_key': 'Youtube',
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'id': 'video_id',
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'title': title,
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})
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# A little optimization - if current page is not
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# "full", ie. does not contain PAGE_SIZE video ids then
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# we can assume that this page is the last one - there
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# are no more ids on further pages - no need to query
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# again.
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if len(entries) < self._GDATA_PAGE_SIZE:
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break
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}
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url_results = PagedList(download_page, self._GDATA_PAGE_SIZE)
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return self.playlist_result(url_results, playlist_title=username)
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@ -6,6 +6,7 @@ import datetime
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import email.utils
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import errno
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import gzip
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import itertools
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import io
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import json
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import locale
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@ -1161,3 +1162,46 @@ def check_executable(exe, args=[]):
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except OSError:
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return False
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return exe
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class PagedList(object):
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def __init__(self, pagefunc, pagesize):
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self._pagefunc = pagefunc
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self._pagesize = pagesize
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def getslice(self, start=0, end=None):
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res = []
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for pagenum in itertools.count(start // self._pagesize):
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firstid = pagenum * self._pagesize
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nextfirstid = pagenum * self._pagesize + self._pagesize
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if start >= nextfirstid:
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continue
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page_results = list(self._pagefunc(pagenum))
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startv = (
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start % self._pagesize
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if firstid <= start < nextfirstid
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else 0)
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endv = (
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((end - 1) % self._pagesize) + 1
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if (end is not None and firstid <= end <= nextfirstid)
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else None)
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if startv != 0 or endv is not None:
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page_results = page_results[startv:endv]
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res.extend(page_results)
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# A little optimization - if current page is not "full", ie. does
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# not contain page_size videos then we can assume that this page
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# is the last one - there are no more ids on further pages -
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# i.e. no need to query again.
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if len(page_results) + startv < self._pagesize:
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break
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# If we got the whole page, but the next page is not interesting,
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# break out early as well
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if end == nextfirstid:
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break
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return res
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