Improve storage file handling

apps/documents/models.py

@@ -96,8 +96,9 @@ class Document(models.Model):
             if save:
                 self.save()
       
-    def read(self, count=1024):
-        return self.file.storage.open(self.file.url).read(count)
+      
+    def open(self):
+        return self.file.storage.open(self.file.path)
 
         
     @models.permalink
@@ -107,7 +108,7 @@ class Document(models.Model):
 
     def update_checksum(self, save=True):
         if self.exists():
-            self.checksum = unicode(CHECKSUM_FUNCTION(self.file.read()))
+            self.checksum = unicode(CHECKSUM_FUNCTION(self.open().read()))
             if save:
                 self.save()
 
@@ -122,22 +123,21 @@ class Document(models.Model):
 
         
     def save_to_file(self, filepath, buffer_size=1024*1024):
-        storage = self.file.storage.open(self.file.url)
+        input_descriptor = self.open()
         output_descriptor = open(filepath, 'wb')
         while 1:
-            copy_buffer = storage.read()
+            copy_buffer = input_descriptor.read()
             if copy_buffer:
                 output_descriptor.write(copy_buffer)
             else:
                 break
     
-        #input_descriptor.close()
         output_descriptor.close()
         return filepath       
        
     
     def exists(self):
-        return self.file.storage.exists(self.file.url)
+        return self.file.storage.exists(self.file.path)
 
         
     def get_metadata_groups(self):

apps/documents/views.py

@@ -503,9 +503,7 @@ def get_document_image(request, document_id, size=PREVIEW_SIZE, quality=QUALITY_
         if filepath:
             return serve_file(request, File(file=open(filepath, 'r')))
         #Save to a temporary location
-        document.file.open()
-        desc = document.file.storage.open(document.file.path)
-        filepath = from_descriptor_to_tempfile(desc, document.checksum)
+        filepath = from_descriptor_to_tempfile(document.open(), document.checksum)
         output_file = convert(filepath, size=size, format='jpg', quality=quality, extra_options=tranformation_string, page=page-1)
         return serve_file(request, File(file=open(output_file, 'r')), content_type='image/jpeg')
     except Exception, e:
@@ -525,7 +523,7 @@ def document_download(request, document_id):
     document = get_object_or_404(Document, pk=document_id)
     try:
         #Test permissions and trigger exception
-        document.file.open()
+        document.open()
         return serve_file(request, document.file, save_as='%s' % document.get_fullname())
     except Exception, e:
         messages.error(request, e)