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 BookMedia, Book, Collection
  10 from catalogue.utils import delete_from_cache_by_language
  11
  12
  13 permanent_cache = caches['permanent']
  14
  15
  16 def _pre_delete_handler(sender, instance, **kwargs):
  17     """ refresh Book on BookMedia delete """
  18     if sender == BookMedia:
  19         instance.book.save()
  20 pre_delete.connect(_pre_delete_handler)
  21
  22
  23 def _post_delete_handler(sender, instance, **kwargs):
  24     """ refresh Book on BookMedia delete """
  25     if sender == Collection:
  26         delete_from_cache_by_language(permanent_cache, 'catalogue.collection:%s/%%s' % instance.slug)
  27         delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
  28 post_delete.connect(_post_delete_handler)
  29
  30
  31 def _post_save_handler(sender, instance, **kwargs):
  32     """ refresh all the short_html stuff on BookMedia update """
  33     if sender == BookMedia:
  34         instance.book.save()
  35         delete_from_cache_by_language(permanent_cache, 'catalogue.audiobook_list/%s')
  36         delete_from_cache_by_language(permanent_cache, 'catalogue.daisy_list/%s')
  37     elif sender == Collection:
  38         delete_from_cache_by_language(permanent_cache, 'catalogue.collection:%s/%%s' % instance.slug)
  39         delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
  40 post_save.connect(_post_save_handler)
  41
  42
  43 def post_publish(sender, **kwargs):
  44     delete_from_cache_by_language(permanent_cache, 'catalogue.book_list/%s')
  45     delete_from_cache_by_language(permanent_cache, 'catalogue.catalogue/%s')
  46 Book.published.connect(post_publish)
  47
  48
  49 if not settings.NO_SEARCH_INDEX:
  50     @django.dispatch.receiver(post_delete, sender=Book)
  51     def _remove_book_from_index_handler(sender, instance, **kwargs):
  52         """ remove the book from search index, when it is deleted."""
  53         from search.index import Index
  54         idx = Index()
  55         idx.remove_book(instance)
  56         idx.index_tags()