mygpo/data/podcast.py

   1 #
   2 # This file is part of my.gpodder.org.
   3 #
   4 # my.gpodder.org is free software: you can redistribute it and/or modify it
   5 # under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or (at your
   7 # option) any later version.
   8 #
   9 # my.gpodder.org is distributed in the hope that it will be useful, but
  10 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
  12 # License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with my.gpodder.org. If not, see <http://www.gnu.org/licenses/>.
  16 #
  17
  18 from collections import Counter
  19 import logging
  20
  21 from django.conf import settings
  22
  23 from mygpo.db.couchdb.podcast_state import subscribed_users, \
  24          subscribed_podcast_ids_by_user_id
  25 from mygpo import pubsub
  26
  27 logger = logging.getLogger(__name__)
  28
  29
  30 def calc_similar_podcasts(podcast, num=20):
  31     """
  32     calculates and returns a list of podcasts that seem to be similar
  33     to the given one.
  34
  35     Probably an expensive operation
  36     """
  37
  38     users = subscribed_users(podcast)
  39
  40     podcasts = Counter()
  41
  42     for user_id in users:
  43         user_subscriptions = subscribed_podcast_ids_by_user_id(user_id)
  44         user_counter = Counter(user_subscriptions)
  45         podcasts.update(user_counter)
  46
  47     return podcasts.most_common(num)
  48
  49
  50 def subscribe_at_hub(podcast):
  51     """ Tries to subscribe to the given podcast at its hub """
  52
  53     if not podcast.hub:
  54         return
  55
  56     base_url = settings.DEFAULT_BASE_URL
  57
  58     if not base_url:
  59         logger.warn('Could not subscribe to podcast {podcast} '
  60                     'at hub {hub} because DEFAULT_BASE_URL is not '
  61                     'set.'.format(podcast=podcast, hub=podcast.hub))
  62         return
  63
  64     logger.info('subscribing to {podcast} at {hub}.'.format(podcast=podcast,
  65                                                            hub=podcast.hub))
  66     pubsub.subscribe(podcast.url, podcast.hub, base_url)