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110 lines
4.5 KiB
Python
110 lines
4.5 KiB
Python
from __future__ import division, unicode_literals
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import re
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import json
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from .fragment import FragmentFD
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from ..compat import compat_urllib_error
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from ..utils import try_get
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from ..extractor.youtube import YoutubeBaseInfoExtractor as YT_BaseIE
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class YoutubeLiveChatReplayFD(FragmentFD):
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""" Downloads YouTube live chat replays fragment by fragment """
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FD_NAME = 'youtube_live_chat_replay'
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def real_download(self, filename, info_dict):
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video_id = info_dict['video_id']
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self.to_screen('[%s] Downloading live chat' % self.FD_NAME)
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fragment_retries = self.params.get('fragment_retries', 0)
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test = self.params.get('test', False)
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ctx = {
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'filename': filename,
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'live': True,
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'total_frags': None,
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}
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def dl_fragment(url):
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headers = info_dict.get('http_headers', {})
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return self._download_fragment(ctx, url, info_dict, headers)
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def parse_yt_initial_data(data):
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patterns = (
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r'%s\\s*%s' % (YT_BaseIE._YT_INITIAL_DATA_RE, YT_BaseIE._YT_INITIAL_BOUNDARY_RE),
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r'%s' % YT_BaseIE._YT_INITIAL_DATA_RE)
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data = data.decode('utf-8', 'replace')
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for patt in patterns:
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try:
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raw_json = re.search(patt, data).group(1)
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return json.loads(raw_json)
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except AttributeError:
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continue
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def download_and_parse_fragment(url, frag_index):
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count = 0
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while count <= fragment_retries:
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try:
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success, raw_fragment = dl_fragment(url)
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if not success:
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return False, None, None
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data = parse_yt_initial_data(raw_fragment) or json.loads(raw_fragment)['response']
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live_chat_continuation = try_get(
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data,
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lambda x: x['continuationContents']['liveChatContinuation'], dict) or {}
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offset = continuation_id = None
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processed_fragment = bytearray()
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for action in live_chat_continuation.get('actions', []):
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if 'replayChatItemAction' in action:
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replay_chat_item_action = action['replayChatItemAction']
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offset = int(replay_chat_item_action['videoOffsetTimeMsec'])
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processed_fragment.extend(
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json.dumps(action, ensure_ascii=False).encode('utf-8') + b'\n')
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if offset is not None:
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continuation_id = try_get(
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live_chat_continuation,
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lambda x: x['continuations'][0]['liveChatReplayContinuationData']['continuation'])
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self._append_fragment(ctx, processed_fragment)
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return True, continuation_id, offset
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except compat_urllib_error.HTTPError as err:
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count += 1
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if count <= fragment_retries:
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self.report_retry_fragment(err, frag_index, count, fragment_retries)
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if count > fragment_retries:
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self.report_error('giving up after %s fragment retries' % fragment_retries)
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return False, None, None
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self._prepare_and_start_frag_download(ctx)
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success, raw_fragment = dl_fragment(
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'https://www.youtube.com/watch?v={}'.format(video_id))
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if not success:
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return False
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data = parse_yt_initial_data(raw_fragment)
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continuation_id = try_get(
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data,
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lambda x: x['contents']['twoColumnWatchNextResults']['conversationBar']['liveChatRenderer']['continuations'][0]['reloadContinuationData']['continuation'])
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# no data yet but required to call _append_fragment
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self._append_fragment(ctx, b'')
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frag_index = offset = 0
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while continuation_id is not None:
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frag_index += 1
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url = ''.join((
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'https://www.youtube.com/live_chat_replay',
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'/get_live_chat_replay' if frag_index > 1 else '',
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'?continuation=%s' % continuation_id,
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'&playerOffsetMs=%d&hidden=false&pbj=1' % max(offset - 5000, 0) if frag_index > 1 else ''))
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success, continuation_id, offset = download_and_parse_fragment(url, frag_index)
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if not success:
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return False
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if test:
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break
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self._finish_frag_download(ctx)
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return True
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