Extraction: Move channel extraction to yt_data_extract
This commit is contained in:
James Taylor
parent
fb1a3531c5
commit
bd343ed71f
@ -137,124 +137,6 @@ def get_channel_search_json(channel_id, query, page):
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return polymer_json
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def extract_info(polymer_json, tab):
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response = polymer_json[1]['response']
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try:
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microformat = response['microformat']['microformatDataRenderer']
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# channel doesn't exist or was terminated
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# example terminated channel: https://www.youtube.com/channel/UCnKJeK_r90jDdIuzHXC0Org
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except KeyError:
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if 'alerts' in response and len(response['alerts']) > 0:
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result = ''
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for alert in response['alerts']:
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result += alert['alertRenderer']['text']['simpleText'] + '\n'
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flask.abort(200, result)
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elif 'errors' in response['responseContext']:
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for error in response['responseContext']['errors']['error']:
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if error['code'] == 'INVALID_VALUE' and error['location'] == 'browse_id':
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flask.abort(404, 'This channel does not exist')
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raise
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info = {}
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info['current_tab'] = tab
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# stuff from microformat (info given by youtube for every page on channel)
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info['short_description'] = microformat['description']
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info['channel_name'] = microformat['title']
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info['avatar'] = microformat['thumbnail']['thumbnails'][0]['url']
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channel_url = microformat['urlCanonical'].rstrip('/')
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channel_id = channel_url[channel_url.rfind('/')+1:]
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info['channel_id'] = channel_id
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info['channel_url'] = 'https://www.youtube.com/channel/' + channel_id
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info['items'] = []
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# empty channel
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if 'contents' not in response and 'continuationContents' not in response:
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return info
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# find the tab with content
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# example channel where tabs do not have definite index: https://www.youtube.com/channel/UC4gQ8i3FD7YbhOgqUkeQEJg
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# TODO: maybe use the 'selected' attribute for this?
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if 'continuationContents' not in response:
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tab_renderer = None
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tab_content = None
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for tab_json in response['contents']['twoColumnBrowseResultsRenderer']['tabs']:
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try:
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tab_renderer = tab_json['tabRenderer']
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except KeyError:
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tab_renderer = tab_json['expandableTabRenderer']
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try:
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tab_content = tab_renderer['content']
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break
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except KeyError:
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pass
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else: # didn't break
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raise Exception("No tabs found with content")
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assert tab == tab_renderer['title'].lower()
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# extract tab-specific info
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if tab in ('videos', 'playlists', 'search'): # find the list of items
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if 'continuationContents' in response:
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try:
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items = response['continuationContents']['gridContinuation']['items']
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except KeyError:
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items = response['continuationContents']['sectionListContinuation']['contents'] # for search
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else:
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contents = tab_content['sectionListRenderer']['contents']
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if 'itemSectionRenderer' in contents[0]:
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item_section = contents[0]['itemSectionRenderer']['contents'][0]
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try:
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items = item_section['gridRenderer']['items']
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except KeyError:
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if "messageRenderer" in item_section:
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items = []
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else:
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raise Exception('gridRenderer missing but messageRenderer not found')
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else:
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items = contents # for search
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additional_info = {'author': info['channel_name'], 'author_url': 'https://www.youtube.com/channel/' + channel_id}
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info['items'] = [yt_data_extract.renderer_info(renderer, additional_info) for renderer in items]
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elif tab == 'about':
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channel_metadata = tab_content['sectionListRenderer']['contents'][0]['itemSectionRenderer']['contents'][0]['channelAboutFullMetadataRenderer']
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info['links'] = []
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for link_json in channel_metadata.get('primaryLinks', ()):
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url = link_json['navigationEndpoint']['urlEndpoint']['url']
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if url.startswith('/redirect'): # youtube puts these on external links to do tracking
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query_string = url[url.find('?')+1: ]
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url = urllib.parse.parse_qs(query_string)['q'][0]
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text = yt_data_extract.get_plain_text(link_json['title'])
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info['links'].append( (text, url) )
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info['stats'] = []
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for stat_name in ('subscriberCountText', 'joinedDateText', 'viewCountText', 'country'):
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try:
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stat = channel_metadata[stat_name]
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except KeyError:
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continue
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info['stats'].append(yt_data_extract.get_plain_text(stat))
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if 'description' in channel_metadata:
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info['description'] = yt_data_extract.get_text(channel_metadata['description'])
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else:
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info['description'] = ''
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else:
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raise NotImplementedError('Unknown or unsupported channel tab: ' + tab)
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return info
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def post_process_channel_info(info):
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info['avatar'] = util.prefix_url(info['avatar'])
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@ -303,7 +185,7 @@ def get_channel_page(channel_id, tab='videos'):
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flask.abort(404, 'Unknown channel tab: ' + tab)
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info = extract_info(json.loads(polymer_json), tab)
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info = yt_data_extract.extract_channel_info(json.loads(polymer_json), tab)
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post_process_channel_info(info)
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if tab in ('videos', 'search'):
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info['number_of_videos'] = number_of_videos
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@ -343,7 +225,7 @@ def get_channel_page_general_url(base_url, tab, request):
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flask.abort(404, 'Unknown channel tab: ' + tab)
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info = extract_info(json.loads(polymer_json), tab)
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info = yt_data_extract.extract_channel_info(json.loads(polymer_json), tab)
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post_process_channel_info(info)
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if tab in ('videos', 'search'):
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info['number_of_videos'] = 1000
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@ -455,7 +455,7 @@ def _get_upstream_videos(channel_id):
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print('Failed to read atoma feed for ' + channel_status_name)
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traceback.print_exc()
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videos = channel.extract_info(json.loads(channel_tab), 'videos')['items']
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videos = yt_data_extract.extract_channel_info(json.loads(channel_tab), 'videos')['items']
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for i, video_item in enumerate(videos):
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if 'description' not in video_item:
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video_item['description'] = ''
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@ -3,6 +3,7 @@ from youtube import util
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import html
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import json
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import re
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import urllib
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# videos (all of type str):
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@ -279,3 +280,123 @@ def parse_info_prepare_for_html(renderer, additional_info={}):
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return item
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def extract_channel_info(polymer_json, tab):
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response = polymer_json[1]['response']
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try:
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microformat = response['microformat']['microformatDataRenderer']
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# channel doesn't exist or was terminated
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# example terminated channel: https://www.youtube.com/channel/UCnKJeK_r90jDdIuzHXC0Org
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except KeyError:
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if 'alerts' in response and len(response['alerts']) > 0:
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result = ''
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for alert in response['alerts']:
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result += alert['alertRenderer']['text']['simpleText'] + '\n'
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flask.abort(200, result)
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elif 'errors' in response['responseContext']:
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for error in response['responseContext']['errors']['error']:
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if error['code'] == 'INVALID_VALUE' and error['location'] == 'browse_id':
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flask.abort(404, 'This channel does not exist')
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raise
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info = {}
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info['current_tab'] = tab
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# stuff from microformat (info given by youtube for every page on channel)
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info['short_description'] = microformat['description']
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info['channel_name'] = microformat['title']
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info['avatar'] = microformat['thumbnail']['thumbnails'][0]['url']
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channel_url = microformat['urlCanonical'].rstrip('/')
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channel_id = channel_url[channel_url.rfind('/')+1:]
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info['channel_id'] = channel_id
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info['channel_url'] = 'https://www.youtube.com/channel/' + channel_id
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info['items'] = []
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# empty channel
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if 'contents' not in response and 'continuationContents' not in response:
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return info
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# find the tab with content
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# example channel where tabs do not have definite index: https://www.youtube.com/channel/UC4gQ8i3FD7YbhOgqUkeQEJg
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# TODO: maybe use the 'selected' attribute for this?
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if 'continuationContents' not in response:
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tab_renderer = None
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tab_content = None
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for tab_json in response['contents']['twoColumnBrowseResultsRenderer']['tabs']:
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try:
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tab_renderer = tab_json['tabRenderer']
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except KeyError:
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tab_renderer = tab_json['expandableTabRenderer']
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try:
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tab_content = tab_renderer['content']
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break
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except KeyError:
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pass
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else: # didn't break
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raise Exception("No tabs found with content")
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assert tab == tab_renderer['title'].lower()
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# extract tab-specific info
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if tab in ('videos', 'playlists', 'search'): # find the list of items
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if 'continuationContents' in response:
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try:
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items = response['continuationContents']['gridContinuation']['items']
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except KeyError:
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items = response['continuationContents']['sectionListContinuation']['contents'] # for search
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else:
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contents = tab_content['sectionListRenderer']['contents']
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if 'itemSectionRenderer' in contents[0]:
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item_section = contents[0]['itemSectionRenderer']['contents'][0]
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try:
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items = item_section['gridRenderer']['items']
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except KeyError:
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if "messageRenderer" in item_section:
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items = []
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else:
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raise Exception('gridRenderer missing but messageRenderer not found')
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else:
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items = contents # for search
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additional_info = {'author': info['channel_name'], 'author_url': 'https://www.youtube.com/channel/' + channel_id}
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info['items'] = [renderer_info(renderer, additional_info) for renderer in items]
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elif tab == 'about':
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channel_metadata = tab_content['sectionListRenderer']['contents'][0]['itemSectionRenderer']['contents'][0]['channelAboutFullMetadataRenderer']
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info['links'] = []
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for link_json in channel_metadata.get('primaryLinks', ()):
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url = link_json['navigationEndpoint']['urlEndpoint']['url']
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if url.startswith('/redirect'): # youtube puts these on external links to do tracking
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query_string = url[url.find('?')+1: ]
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url = urllib.parse.parse_qs(query_string)['q'][0]
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text = get_plain_text(link_json['title'])
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info['links'].append( (text, url) )
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info['stats'] = []
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for stat_name in ('subscriberCountText', 'joinedDateText', 'viewCountText', 'country'):
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try:
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stat = channel_metadata[stat_name]
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except KeyError:
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continue
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info['stats'].append(get_plain_text(stat))
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if 'description' in channel_metadata:
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info['description'] = get_text(channel_metadata['description'])
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else:
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info['description'] = ''
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else:
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raise NotImplementedError('Unknown or unsupported channel tab: ' + tab)
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return info
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