More Py3 compatibility fixes.

[wolnelektury.git] / src / catalogue / helpers.py

diff --git a/src/catalogue/helpers.py b/src/catalogue/helpers.py
index e476079..0330e69 100644 (file)
--- a/src/catalogue/helpers.py
+++ b/src/catalogue/helpers.py
@@ -3,16 +3,19 @@
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 from django.conf import settings
+from django.contrib.contenttypes.models import ContentType
+from django.core.cache import cache
+
 from .models import Tag, Book
 from os.path import getmtime
-import cPickle
+import pickle
 from collections import defaultdict
 
 
 BOOK_CATEGORIES = ('author', 'epoch', 'genre', 'kind')
 
 _COUNTERS = None
-_COUNTER_TIME = None
+_COUNTER_TIME = 0
 
 
 def get_top_level_related_tags(tags, categories=None):
@@ -25,8 +28,17 @@ def get_top_level_related_tags(tags, categories=None):
     global _COUNTERS, _COUNTER_TIME
     # First, check that we have a valid and recent version of the counters.
     if getmtime(settings.CATALOGUE_COUNTERS_FILE) > _COUNTER_TIME:
-        with open(settings.CATALOGUE_COUNTERS_FILE) as f:
-            _COUNTERS = cPickle.load(f)
+        for i in range(10):
+            try:
+                with open(settings.CATALOGUE_COUNTERS_FILE, 'rb') as f:
+                    _COUNTERS = pickle.load(f)
+            except (EOFError, ValueError):
+                if i < 9:
+                    continue
+                else:
+                    raise
+            else:
+                break
 
     tagids = tuple(sorted(t.pk for t in tags))
     try:
@@ -36,7 +48,6 @@ def get_top_level_related_tags(tags, categories=None):
 
     related = Tag.objects.filter(pk__in=related_ids)
 
-    # TODO: do we really need that?
     if categories is not None:
         related = related.filter(category__in=categories)
 
@@ -84,5 +95,18 @@ def update_counters():
         "next": dict(next_combinations),
     }
 
-    with open(settings.CATALOGUE_COUNTERS_FILE, 'w') as f:
-        cPickle.dump(counters, f)
+    with open(settings.CATALOGUE_COUNTERS_FILE, 'wb') as f:
+        pickle.dump(counters, f)
+
+
+def get_audiobook_tags():
+    audiobook_tag_ids = cache.get('audiobook_tags')
+    if audiobook_tag_ids is None:
+        books_with_audiobook = Book.objects.filter(media__type__in=('mp3', 'ogg'))\
+            .distinct().values_list('pk', flat=True)
+        audiobook_tag_ids = Tag.objects.filter(
+            items__content_type=ContentType.objects.get_for_model(Book),
+            items__object_id__in=list(books_with_audiobook)).distinct().values_list('pk', flat=True)
+        audiobook_tag_ids = list(audiobook_tag_ids)
+        cache.set('audiobook_tags', audiobook_tag_ids)
+    return audiobook_tag_ids