[youtube_live_chat] Fix parse_yt_initial_data and add fragment_retries

:ci skip dl
This commit is contained in:
pukkandan 2021-01-31 13:18:06 +05:30
parent af819c216f
commit 82e3f6ebda
2 changed files with 57 additions and 56 deletions

View file

@ -4,6 +4,9 @@
import json
from .fragment import FragmentFD
from ..compat import compat_urllib_error
from ..utils import try_get
from ..extractor.youtube import YoutubeBaseInfoExtractor as YT_BaseIE
class YoutubeLiveChatReplayFD(FragmentFD):
@ -15,6 +18,7 @@ def real_download(self, filename, info_dict):
video_id = info_dict['video_id']
self.to_screen('[%s] Downloading live chat' % self.FD_NAME)
fragment_retries = self.params.get('fragment_retries', 0)
test = self.params.get('test', False)
ctx = {
@ -28,15 +32,52 @@ def dl_fragment(url):
return self._download_fragment(ctx, url, info_dict, headers)
def parse_yt_initial_data(data):
window_patt = b'window\\["ytInitialData"\\]\\s*=\\s*(.*?)(?<=});'
var_patt = b'var\\s+ytInitialData\\s*=\\s*(.*?)(?<=});'
for patt in window_patt, var_patt:
patterns = (
r'%s\\s*%s' % (YT_BaseIE._YT_INITIAL_DATA_RE, YT_BaseIE._YT_INITIAL_BOUNDARY_RE),
r'%s' % YT_BaseIE._YT_INITIAL_DATA_RE)
data = data.decode('utf-8', 'replace')
for patt in patterns:
try:
raw_json = re.search(patt, data).group(1)
return json.loads(raw_json)
except AttributeError:
continue
def download_and_parse_fragment(url, frag_index):
count = 0
while count <= fragment_retries:
try:
success, raw_fragment = dl_fragment(url)
if not success:
return False, None, None
data = parse_yt_initial_data(raw_fragment) or json.loads(raw_fragment)['response']
live_chat_continuation = try_get(
data,
lambda x: x['continuationContents']['liveChatContinuation'], dict) or {}
offset = continuation_id = None
processed_fragment = bytearray()
for action in live_chat_continuation.get('actions', []):
if 'replayChatItemAction' in action:
replay_chat_item_action = action['replayChatItemAction']
offset = int(replay_chat_item_action['videoOffsetTimeMsec'])
processed_fragment.extend(
json.dumps(action, ensure_ascii=False).encode('utf-8') + b'\n')
if offset is not None:
continuation_id = try_get(
live_chat_continuation,
lambda x: x['continuations'][0]['liveChatReplayContinuationData']['continuation'])
self._append_fragment(ctx, processed_fragment)
return True, continuation_id, offset
except compat_urllib_error.HTTPError as err:
count += 1
if count <= fragment_retries:
self.report_retry_fragment(err, frag_index, count, fragment_retries)
if count > fragment_retries:
self.report_error('giving up after %s fragment retries' % fragment_retries)
return False, None, None
self._prepare_and_start_frag_download(ctx)
success, raw_fragment = dl_fragment(
@ -44,54 +85,23 @@ def parse_yt_initial_data(data):
if not success:
return False
data = parse_yt_initial_data(raw_fragment)
continuation_id = data['contents']['twoColumnWatchNextResults']['conversationBar']['liveChatRenderer']['continuations'][0]['reloadContinuationData']['continuation']
continuation_id = try_get(
data,
lambda x: x['contents']['twoColumnWatchNextResults']['conversationBar']['liveChatRenderer']['continuations'][0]['reloadContinuationData']['continuation'])
# no data yet but required to call _append_fragment
self._append_fragment(ctx, b'')
first = True
offset = None
frag_index = offset = 0
while continuation_id is not None:
data = None
if first:
url = 'https://www.youtube.com/live_chat_replay?continuation={}'.format(continuation_id)
success, raw_fragment = dl_fragment(url)
if not success:
return False
data = parse_yt_initial_data(raw_fragment)
else:
url = ('https://www.youtube.com/live_chat_replay/get_live_chat_replay'
+ '?continuation={}'.format(continuation_id)
+ '&playerOffsetMs={}'.format(max(offset - 5000, 0))
+ '&hidden=false'
+ '&pbj=1')
success, raw_fragment = dl_fragment(url)
if not success:
return False
data = json.loads(raw_fragment)['response']
first = False
continuation_id = None
live_chat_continuation = data['continuationContents']['liveChatContinuation']
offset = None
processed_fragment = bytearray()
if 'actions' in live_chat_continuation:
for action in live_chat_continuation['actions']:
if 'replayChatItemAction' in action:
replay_chat_item_action = action['replayChatItemAction']
offset = int(replay_chat_item_action['videoOffsetTimeMsec'])
processed_fragment.extend(
json.dumps(action, ensure_ascii=False).encode('utf-8') + b'\n')
try:
continuation_id = live_chat_continuation['continuations'][0]['liveChatReplayContinuationData']['continuation']
except KeyError:
continuation_id = None
self._append_fragment(ctx, processed_fragment)
if test or offset is None:
frag_index += 1
url = 'https://www.youtube.com/live_chat_replay?continuation=%s' % continuation_id
if frag_index > 1:
url += '&playerOffsetMs=%d&hidden=false&pbj=1' % max(offset - 5000, 0)
success, continuation_id, offset = download_and_parse_fragment(url, frag_index)
if not success:
return False
if test:
break
self._finish_frag_download(ctx)
return True

View file

@ -277,15 +277,6 @@ def _download_webpage_handle(self, *args, **kwargs):
return super(YoutubeBaseInfoExtractor, self)._download_webpage_handle(
*args, **compat_kwargs(kwargs))
def _get_yt_initial_data(self, video_id, webpage):
config = self._search_regex(
(r'window\["ytInitialData"\]\s*=\s*(.*?)(?<=});',
r'var\s+ytInitialData\s*=\s*(.*?)(?<=});'),
webpage, 'ytInitialData', default=None)
if config:
return self._parse_json(
uppercase_escape(config), video_id, fatal=False)
def _real_initialize(self):
if self._downloader is None:
return
@ -1943,7 +1934,7 @@ def feed_entry(name):
has_live_chat_replay = False
if not is_live:
yt_initial_data = self._get_yt_initial_data(video_id, video_webpage)
yt_initial_data = self._extract_yt_initial_data(video_id, video_webpage)
try:
yt_initial_data['contents']['twoColumnWatchNextResults']['conversationBar']['liveChatRenderer']['continuations'][0]['reloadContinuationData']['continuation']
has_live_chat_replay = True