src/catalogue/signals.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.core.exceptions import ImproperlyConfigured
   8 from django.db.models.signals import post_save, post_delete
   9 from django.dispatch import receiver
  10 from ssify import flush_ssi_includes
  11 from newtagging.models import tags_updated
  12 from picture.models import Picture, PictureArea
  13 from .models import BookMedia, Book, Collection, Fragment, Tag
  14
  15
  16 ####
  17 # BookMedia
  18 ####
  19
  20
  21 @receiver([post_save, post_delete], sender=BookMedia)
  22 def bookmedia_save(sender, instance, **kwargs):
  23     instance.book.set_audio_length()
  24     instance.book.save()
  25
  26
  27 ####
  28 # Collection
  29 ####
  30
  31
  32 @receiver(post_save, sender=Collection)
  33 def collection_save(sender, instance, **kwargs):
  34     caches[settings.CACHE_MIDDLEWARE_ALIAS].clear()
  35     flush_ssi_includes([
  36         '/katalog/%s.json' % lang
  37         for lang in [lc for (lc, _ln) in settings.LANGUAGES]])
  38
  39
  40 @receiver(post_delete, sender=Collection)
  41 def collection_delete(sender, instance, **kwargs):
  42     flush_ssi_includes([
  43         '/katalog/%s.json' % lang
  44         for lang in [lc for (lc, _ln) in settings.LANGUAGES]])
  45
  46 ####
  47 # Book
  48 ####
  49
  50
  51 @receiver(post_save, sender=Book)
  52 def book_save(sender, instance, **kwargs):
  53     # Books come out anywhere.
  54     caches[settings.CACHE_MIDDLEWARE_ALIAS].clear()
  55     # deleting selectively is too much work
  56     try:
  57         caches['template_fragments'].clear()
  58     except ImproperlyConfigured:
  59         pass
  60     instance.flush_includes()
  61
  62
  63 @receiver(post_delete, sender=Book)
  64 def book_delete(sender, instance, **kwargs):
  65     caches[settings.CACHE_MIDDLEWARE_ALIAS].clear()
  66     flush_ssi_includes([
  67         '/katalog/%s.json' % lang
  68         for lang in [lc for (lc, _ln) in settings.LANGUAGES]])
  69
  70     if not settings.NO_SEARCH_INDEX:
  71         # remove the book from search index, when it is deleted.
  72         from search.index import Index
  73         idx = Index()
  74         idx.remove_book(instance)
  75         idx.index_tags()
  76
  77
  78 ####
  79 # Tag
  80 ####
  81
  82
  83 @receiver(Tag.after_change)
  84 def tag_after_change(sender, instance, languages, **kwargs):
  85     caches[settings.CACHE_MIDDLEWARE_ALIAS].clear()
  86     flush_ssi_includes([
  87         '/katalog/%s.json' % lang
  88         for lang in [lc for (lc, _ln) in settings.LANGUAGES]])
  89
  90     for model in Book, Picture:
  91         for model_instance in model.tagged.with_all([instance]).only('pk'):
  92             model_instance.flush_includes()
  93
  94     if instance.category == 'author':
  95         for model in Fragment, PictureArea:
  96             for model_instance in model.tagged.with_all([instance]).only('pk'):
  97                 model_instance.flush_includes()
  98
  99
 100 @receiver(tags_updated)
 101 def receive_tags_updated(sender, instance, affected_tags, **kwargs):
 102     categories = set(tag.category for tag in affected_tags if tag.category not in ('set', 'book'))
 103     if not categories:
 104         return
 105
 106     caches[settings.CACHE_MIDDLEWARE_ALIAS].clear()
 107     instance.flush_includes()
 108     flush_ssi_includes([
 109         '/katalog/%s.json' % lang
 110         for lang in [lc for (lc, _ln) in settings.LANGUAGES]])