mygpo/users/tasks.py

   1 from itertools import chain
   2 from operator import itemgetter
   3 from collections import Counter
   4
   5 from couchdbkit import ResourceConflict
   6
   7 from mygpo.cel import celery
   8 from mygpo.db.couchdb.user import suggestions_for_user
   9
  10
  11 @celery.task(max_retries=5, default_retry_delay=60)
  12 def sync_user(user):
  13     """ Syncs all of the user's device groups """
  14
  15     for group in user.get_grouped_devices():
  16         if group.is_synced:
  17             device = group.devices[0]
  18             user.sync_group(device)
  19
  20
  21 @celery.task(max_retries=5, default_retry_delay=60)
  22 def update_suggestions(user, max_suggestions=15):
  23     """ updates the suggestions of a user """
  24
  25     # get suggestions object
  26     suggestion = suggestions_for_user(user)
  27
  28     # calculate possible suggestions
  29     subscribed_podcasts = list(set(user.get_subscribed_podcasts()))
  30     subscribed_podcasts = filter(None, subscribed_podcasts)
  31     related = chain.from_iterable([p.related_podcasts for p in subscribed_podcasts])
  32
  33     # filter out blacklisted podcasts
  34     related = filter(lambda pid: not pid in suggestion.blacklist, related)
  35
  36     # get most relevant
  37     counter = Counter(related)
  38     get_podcast_id = itemgetter(0)
  39     suggested = map(get_podcast_id, counter.most_common(max_suggestions))
  40     suggestion.podcasts = suggested
  41
  42     try:
  43         # update suggestions object
  44         suggestion.save()
  45
  46     except ResourceConflict as ex:
  47         raise update_suggestions.retry(exc=ex)