Remove image cache (#113)

* Remove image cache

* Fix changelog

CHANGES.rst

@@ -6,7 +6,8 @@ There's a frood who really knows where his towel is.
 2.10.2 (unreleased)
 ^^^^^^^^^^^^^^^^^^^
 
-- Nothing changed yet.
+- Remove useless scale caching on the request as it seems to be causing colateral issues (closes `#109 <https://github.com/collective/sc.social.like/issues/109>`_).
+  [rodfersou]
 
 
 2.10.1 (2017-08-02)

sc/social/like/utils.py

@@ -4,71 +4,55 @@
 from Products.CMFPlone.utils import safe_hasattr
 from sc.social.like.logger import logger
 from urlparse import urlparse
-from zope.annotation.interfaces import IAnnotations
-from zope.globalrequest import getRequest
 from zope.interface import Invalid
 
 
 def get_images_view(context):
-    request = getRequest()
-    key = 'cache-view-' + str(context)
-    cache = IAnnotations(request)
-    value = cache.get(key, None)
-    if not value:
-        view = context.unrestrictedTraverse('@@images', None)
-        field = 'image'
-        if view:
-            fields = ['image', 'leadImage', 'portrait']
-            if IBaseContent.providedBy(context):
-                schema = context.Schema()
-                field = [f for f in schema.keys() if f in fields]
-                if field:
-                    field = field[0]
-                    # if a content has an image field that isn't an ImageField
-                    # (for example a relation field), set field='' to avoid errors
-                    if schema[field].type not in ['image', 'blob']:
-                        field = ''
-        value = (view, field) if (view and field) else (None, None)
-        cache[key] = value
-    return value
+    view = context.unrestrictedTraverse('@@images', None)
+    field = 'image'
+    if view:
+        fields = ['image', 'leadImage', 'portrait']
+        if IBaseContent.providedBy(context):
+            schema = context.Schema()
+            field = [f for f in schema.keys() if f in fields]
+            if field:
+                field = field[0]
+                # if a content has an image field that isn't an ImageField
+                # (for example a relation field), set field='' to avoid errors
+                if schema[field].type not in ['image', 'blob']:
+                    field = ''
+    return (view, field) if (view and field) else (None, None)
 
 
 def get_content_image(context,
                       scale='large',
                       width=None,
                       height=None):
-    request = getRequest()
-    modification = context.ModificationDate()
-    key = 'cache-{0}-{1}-{2}-{3}-{4}'.format(
-        context, modification, scale, width, height)
-    cache = IAnnotations(request)
-    img = cache.get(key, None)
-    if not img:
-        view, field = get_images_view(context)
-        if view:
+    view, field = get_images_view(context)
+    img = None
+    if view:
+        try:
+            sizes = view.getImageSize(field)
+        except AttributeError:
+            sizes = img = None
+        if sizes == (0, 0) or sizes == ('', ''):
+            # this avoid strange cases where we can't get size infos.
+            # for example if the loaded image in a news is a bmp or a tiff
+            return None
+        if sizes:
+            kwargs = {}
+            if not (width or height):
+                kwargs['scale'] = scale
+            else:
+                new = (width, height)
+                width, height = _image_size(sizes, new)
+                kwargs['width'] = width
+                kwargs['height'] = height
+                kwargs['direction'] = 'down'
             try:
-                sizes = view.getImageSize(field)
-            except AttributeError:
-                sizes = img = None
-            if sizes == (0, 0) or sizes == ('', ''):
-                # this avoid strange cases where we can't get size infos.
-                # for example if the loaded image in a news is a bmp or a tiff
-                return None
-            if sizes:
-                kwargs = {}
-                if not (width or height):
-                    kwargs['scale'] = scale
-                else:
-                    new = (width, height)
-                    width, height = _image_size(sizes, new)
-                    kwargs['width'] = width
-                    kwargs['height'] = height
-                    kwargs['direction'] = 'down'
-                try:
-                    img = view.scale(fieldname=field, **kwargs)
-                except (AttributeError, TypeError):
-                    img = None
-        cache[key] = img
+                img = view.scale(fieldname=field, **kwargs)
+            except (AttributeError, TypeError):
+                img = None
     return img