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from youtube import util, yt_data_extract, html_common, channel
import settings
from string import Template
import sqlite3
import os
import time
import gevent
with open('yt_subscriptions_template.html', 'r', encoding='utf-8') as f:
subscriptions_template = Template(f.read())
thumbnails_directory = os.path.join(settings.data_dir, "subscription_thumbnails")
# https://stackabuse.com/a-sqlite-tutorial-with-python/
database_path = os.path.join(settings.data_dir, "subscriptions.sqlite")
def open_database():
if not os.path.exists(settings.data_dir):
os.makedirs(settings.data_dir)
connection = sqlite3.connect(database_path)
# Create tables if they don't exist
try:
cursor = connection.cursor()
cursor.execute('''CREATE TABLE IF NOT EXISTS subscribed_channels (
id integer PRIMARY KEY,
channel_id text UNIQUE NOT NULL,
channel_name text NOT NULL,
time_last_checked integer
)''')
cursor.execute('''CREATE TABLE IF NOT EXISTS videos (
id integer PRIMARY KEY,
uploader_id integer NOT NULL REFERENCES subscribed_channels(id) ON UPDATE CASCADE ON DELETE CASCADE,
video_id text UNIQUE NOT NULL,
title text NOT NULL,
duration text,
time_published integer NOT NULL,
description text
)''')
connection.commit()
except:
connection.rollback()
connection.close()
raise
return connection
def _subscribe(channels):
''' channels is a list of (channel_id, channel_name) '''
# set time_last_checked to 0 on all channels being subscribed to
channels = ( (channel_id, channel_name, 0) for channel_id, channel_name in channels)
connection = open_database()
try:
cursor = connection.cursor()
cursor.executemany("INSERT OR IGNORE INTO subscribed_channels (channel_id, channel_name, time_last_checked) VALUES (?, ?, ?)", channels)
connection.commit()
except:
connection.rollback()
raise
finally:
connection.close()
def _unsubscribe(channel_ids):
''' channel_ids is a list of channel_ids '''
connection = open_database()
try:
cursor = connection.cursor()
cursor.executemany("DELETE FROM subscribed_channels WHERE channel_id=?", ((channel_id, ) for channel_id in channel_ids))
connection.commit()
except:
connection.rollback()
raise
finally:
connection.close()
def _get_videos(number, offset):
connection = open_database()
try:
cursor = connection.cursor()
db_videos = cursor.execute('''SELECT video_id, title, duration, channel_name
FROM videos
INNER JOIN subscribed_channels on videos.uploader_id = subscribed_channels.id
ORDER BY time_published DESC
LIMIT ? OFFSET ?''', (number, offset))
for db_video in db_videos:
yield {
'id': db_video[0],
'title': db_video[1],
'duration': db_video[2],
'author': db_video[3],
}
except:
connection.rollback()
raise
finally:
connection.close()
units = {
'year': 31536000, # 365*24*3600
'month': 2592000, # 30*24*3600
'week': 604800, # 7*24*3600
'day': 86400, # 24*3600
'hour': 3600,
'minute': 60,
'second': 1,
}
def youtube_timestamp_to_posix(dumb_timestamp):
''' Given a dumbed down timestamp such as 1 year ago, 3 hours ago,
approximates the unix time (seconds since 1/1/1970) '''
dumb_timestamp = dumb_timestamp.lower()
now = time.time()
if dumb_timestamp == "just now":
return now
split = dumb_timestamp.split(' ')
number, unit = int(split[0]), split[1]
if number > 1:
unit = unit[:-1] # remove s from end
return now - number*units[unit]
# Use this to mark a thumbnail acceptable to be retrieved at the request of the browser
downloading_thumbnails = set()
def download_thumbnails(thumbnails_directory, thumbnails):
try:
g = gevent.spawn(util.download_thumbnails, thumbnails_directory, thumbnails)
g.join()
finally:
downloading_thumbnails.difference_update(thumbnails)
def _get_upstream_videos(channel_id):
videos = []
json_channel_videos = channel.get_grid_items(channel.get_channel_tab(channel_id)[1]['response'])
for i, json_video in enumerate(json_channel_videos):
info = yt_data_extract.renderer_info(json_video['gridVideoRenderer'])
if 'description' not in info:
info['description'] = ''
info['time_published'] = youtube_timestamp_to_posix(info['published']) - i # subtract a few seconds off the videos so they will be in the right order
videos.append(info)
try:
existing_thumbnails = set(os.path.splitext(name)[0] for name in os.listdir(thumbnails_directory))
except FileNotFoundError:
existing_thumbnails = set()
missing_thumbnails = set(video['id'] for video in videos) - existing_thumbnails
downloading_thumbnails.update(missing_thumbnails)
gevent.spawn(download_thumbnails, thumbnails_directory, missing_thumbnails)
return videos
def get_subscriptions_page(env, start_response):
items_html = '''<nav class="item-grid">\n'''
for item in _get_videos(30, 0):
print("Downloading_thumbnails: ", downloading_thumbnails)
if item['id'] in downloading_thumbnails:
item['thumbnail'] = util.get_thumbnail_url(item['id'])
else:
item['thumbnail'] = util.URL_ORIGIN + '/data/subscription_thumbnails/' + item['id'] + '.jpg'
items_html += html_common.video_item_html(item, html_common.small_video_item_template)
items_html += '''\n</nav>'''
start_response('200 OK', [('Content-type','text/html'),])
return subscriptions_template.substitute(
header = html_common.get_header(),
items = items_html,
page_buttons = '',
).encode('utf-8')
def post_subscriptions_page(env, start_response):
params = env['parameters']
action = params['action'][0]
if action == 'subscribe':
if len(params['channel_id']) != len(params['channel_name']):
start_response('400 Bad Request', ())
return b'400 Bad Request, length of channel_id != length of channel_name'
_subscribe(zip(params['channel_id'], params['channel_name']))
elif action == 'unsubscribe':
_unsubscribe(params['channel_id'])
elif action == 'refresh':
connection = open_database()
try:
cursor = connection.cursor()
for uploader_id, channel_id in cursor.execute('''SELECT id, channel_id FROM subscribed_channels''').fetchall():
db_videos = ( (uploader_id, info['id'], info['title'], info['duration'], info['time_published'], info['description']) for info in _get_upstream_videos(channel_id) )
cursor.executemany('''INSERT OR IGNORE INTO videos (uploader_id, video_id, title, duration, time_published, description) VALUES (?, ?, ?, ?, ?, ?)''', db_videos)
cursor.execute('''UPDATE subscribed_channels SET time_last_checked = ?''', ( int(time.time()), ) )
connection.commit()
except:
connection.rollback()
raise
finally:
connection.close()
start_response('303 See Other', [('Location', util.URL_ORIGIN + '/subscriptions'),] )
return b''
else:
start_response('400 Bad Request', ())
return b'400 Bad Request'
start_response('204 No Content', ())
return b''
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