Cache tweaks

boards/models/attachment/viewers.py

@@ -214,20 +214,12 b' class UrlViewer(AbstractViewer):'
 
         domain = get_domain(self.url)
 
-        if protocol in URL_PROTOCOLS:
-            url_image_name = URL_PROTOCOLS.get(protocol)
-        elif domain:
-            url_image_name = self._find_image_for_domains(domain) or FILE_STUB_URL
-        else:
-            url_image_name = FILE_STUB_URL
-
-        image_path = 'images/{}.png'.format(url_image_name)
+        image_path = 'images/{}.png'.format(self._get_image_name(protocol, domain))
         image = static(image_path)
         w, h = self.get_static_dimensions(image_path)
 
         return URL_FORMAT_VIEW.format(self.url, image, w, h)
 
-    @cached_result()
     def _find_image_for_domains(self, domain):
         """
         Searches for the domain image for every domain level except top.
@@ -243,3 +235,15 b' class UrlViewer(AbstractViewer):'
                 return 'domains/' + domain
             else:
                 del levels[0]
+
+    @cached_result()
+    def _get_image_name(self, protocol, domain):
+        if protocol in URL_PROTOCOLS:
+            url_image_name = URL_PROTOCOLS.get(protocol)
+        elif domain:
+            url_image_name = self._find_image_for_domains(domain) or FILE_STUB_URL
+        else:
+            url_image_name = FILE_STUB_URL
+
+        return url_image_name
+