apps/catalogue/models/listeners.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 from django.conf import settings
   6 from django.core.cache import caches
   7 from django.db.models.signals import post_save, pre_delete, post_delete
   8 import django.dispatch
   9 from catalogue.models import Tag, BookMedia, Book, Fragment, Collection
  10 from catalogue import tasks
  11 from catalogue.utils import delete_from_cache_by_language
  12 from newtagging.models import tags_updated
  13
  14
  15 permanent_cache = caches['permanent']
  16
  17
  18 def _pre_delete_handler(sender, instance, **kwargs):
  19     """ refresh Book on BookMedia delete """
  20     if sender == BookMedia:
  21         instance.book.save()
  22 pre_delete.connect(_pre_delete_handler)
  23
  24
  25 def _post_delete_handler(sender, instance, **kwargs):
  26     """ refresh Book on BookMedia delete """
  27     if sender == Collection:
  28         delete_from_cache_by_language(permanent_cache, 'catalogue.collection:%s/%%s' % instance.slug)
  29         delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
  30 post_delete.connect(_post_delete_handler)
  31
  32
  33 def _post_save_handler(sender, instance, **kwargs):
  34     """ refresh all the short_html stuff on BookMedia update """
  35     if sender == BookMedia:
  36         instance.book.save()
  37         delete_from_cache_by_language(permanent_cache, 'catalogue.audiobook_list/%s')
  38         delete_from_cache_by_language(permanent_cache, 'catalogue.daisy_list/%s')
  39     elif sender == Collection:
  40         delete_from_cache_by_language(permanent_cache, 'catalogue.collection:%s/%%s' % instance.slug)
  41         delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
  42 post_save.connect(_post_save_handler)
  43
  44
  45 def post_publish(sender, **kwargs):
  46     delete_from_cache_by_language(permanent_cache, 'catalogue.book_list/%s')
  47     delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
  48 Book.published.connect(post_publish)
  49
  50
  51 if not settings.NO_SEARCH_INDEX:
  52     @django.dispatch.receiver(post_delete, sender=Book)
  53     def _remove_book_from_index_handler(sender, instance, **kwargs):
  54         """ remove the book from search index, when it is deleted."""
  55         from search.index import Index
  56         idx = Index()
  57         idx.remove_book(instance)
  58         idx.index_tags()