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from __future__ import division, unicode_literals
import json
import time
from .fragment import FragmentFD
from ..compat import compat_urllib_error
from ..utils import (
try_get,
dict_get,
int_or_none,
RegexNotFoundError,
)
from ..extractor.youtube import YoutubeBaseInfoExtractor as YT_BaseIE
class YoutubeLiveChatFD(FragmentFD):
""" Downloads YouTube live chats fragment by fragment """
FD_NAME = 'youtube_live_chat'
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 = {
'filename': filename,
'live': True,
'total_frags': None,
}
ie = YT_BaseIE(self.ydl)
start_time = int(time.time() * 1000)
def dl_fragment(url, data=None, headers=None):
http_headers = info_dict.get('http_headers', {})
if headers:
http_headers = http_headers.copy()
http_headers.update(headers)
return self._download_fragment(ctx, url, info_dict, http_headers, data)
def parse_actions_replay(live_chat_continuation):
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 continuation_id, offset
live_offset = 0
def parse_actions_live(live_chat_continuation):
nonlocal live_offset
continuation_id = None
processed_fragment = bytearray()
for action in live_chat_continuation.get('actions', []):
timestamp = self.parse_live_timestamp(action)
if timestamp is not None:
live_offset = timestamp - start_time
# compatibility with replay format
pseudo_action = {
'replayChatItemAction': {'actions': [action]},
'videoOffsetTimeMsec': str(live_offset),
'isLive': True,
}
processed_fragment.extend(
json.dumps(pseudo_action, ensure_ascii=False).encode('utf-8') + b'\n')
continuation_data_getters = [
lambda x: x['continuations'][0]['invalidationContinuationData'],
lambda x: x['continuations'][0]['timedContinuationData'],
]
continuation_data = try_get(live_chat_continuation, continuation_data_getters, dict)
if continuation_data:
continuation_id = continuation_data.get('continuation')
timeout_ms = int_or_none(continuation_data.get('timeoutMs'))
if timeout_ms is not None:
time.sleep(timeout_ms / 1000)
self._append_fragment(ctx, processed_fragment)
return continuation_id, live_offset
if info_dict['protocol'] == 'youtube_live_chat_replay':
parse_actions = parse_actions_replay
elif info_dict['protocol'] == 'youtube_live_chat':
parse_actions = parse_actions_live
def download_and_parse_fragment(url, frag_index, request_data, headers):
count = 0
while count <= fragment_retries:
try:
success, raw_fragment = dl_fragment(url, request_data, headers)
if not success:
return False, None, None
data = json.loads(raw_fragment)
live_chat_continuation = try_get(
data,
lambda x: x['continuationContents']['liveChatContinuation'], dict) or {}
continuation_id, offset = parse_actions(live_chat_continuation)
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(info_dict['url'])
if not success:
return False
try:
data = ie._extract_yt_initial_data(video_id, raw_fragment.decode('utf-8', 'replace'))
except RegexNotFoundError:
return False
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'')
ytcfg = ie._extract_ytcfg(video_id, raw_fragment.decode('utf-8', 'replace'))
if not ytcfg:
return False
api_key = try_get(ytcfg, lambda x: x['INNERTUBE_API_KEY'])
innertube_context = try_get(ytcfg, lambda x: x['INNERTUBE_CONTEXT'])
if not api_key or not innertube_context:
return False
visitor_data = try_get(innertube_context, lambda x: x['client']['visitorData'], str)
if info_dict['protocol'] == 'youtube_live_chat_replay':
url = 'https://www.youtube.com/youtubei/v1/live_chat/get_live_chat_replay?key=' + api_key
elif info_dict['protocol'] == 'youtube_live_chat':
url = 'https://www.youtube.com/youtubei/v1/live_chat/get_live_chat?key=' + api_key
frag_index = offset = 0
while continuation_id is not None:
frag_index += 1
request_data = {
'context': innertube_context,
'continuation': continuation_id,
}
if frag_index > 1:
request_data['currentPlayerState'] = {'playerOffsetMs': str(max(offset - 5000, 0))}
headers = ie._generate_api_headers(ytcfg, visitor_data=visitor_data)
headers.update({'content-type': 'application/json'})
fragment_request_data = json.dumps(request_data, ensure_ascii=False).encode('utf-8') + b'\n'
success, continuation_id, offset = download_and_parse_fragment(
url, frag_index, fragment_request_data, headers)
if not success:
return False
if test:
break
self._finish_frag_download(ctx)
return True
@staticmethod
def parse_live_timestamp(action):
action_content = dict_get(
action,
['addChatItemAction', 'addLiveChatTickerItemAction', 'addBannerToLiveChatCommand'])
if not isinstance(action_content, dict):
return None
item = dict_get(action_content, ['item', 'bannerRenderer'])
if not isinstance(item, dict):
return None
renderer = dict_get(item, [
# text
'liveChatTextMessageRenderer', 'liveChatPaidMessageRenderer',
'liveChatMembershipItemRenderer', 'liveChatPaidStickerRenderer',
# ticker
'liveChatTickerPaidMessageItemRenderer',
'liveChatTickerSponsorItemRenderer',
# banner
'liveChatBannerRenderer',
])
if not isinstance(renderer, dict):
return None
parent_item_getters = [
lambda x: x['showItemEndpoint']['showLiveChatItemEndpoint']['renderer'],
lambda x: x['contents'],
]
parent_item = try_get(renderer, parent_item_getters, dict)
if parent_item:
renderer = dict_get(parent_item, [
'liveChatTextMessageRenderer', 'liveChatPaidMessageRenderer',
'liveChatMembershipItemRenderer', 'liveChatPaidStickerRenderer',
])
if not isinstance(renderer, dict):
return None
return int_or_none(renderer.get('timestampUsec'), 1000)
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