Issue #57, conver the document image queue maintenance view into a celery task

mayan/apps/documents/tasks.py

@@ -11,3 +11,12 @@ logger = logging.getLogger(__name__)
 def task_get_document_image(document_id, *args, **kwargs):
     document = Document.objects.get(pk=document_id)
     return document.get_image(*args, **kwargs)
+
+
+@app.task
+def task_clear_image_cache():
+    # TODO: Error logging
+    #try:
+    Document.clear_image_cache()
+    # except Exception as exception:
+    #    messages.error(request, _(u'Error clearing document image cache; %s') % exception)

mayan/apps/documents/views.py

@@ -50,7 +50,7 @@ from .permissions import (PERMISSION_DOCUMENT_PROPERTIES_EDIT,
 from .runtime import storage_backend
 from .settings import (PREVIEW_SIZE, RECENT_COUNT, ROTATION_STEP,
                        ZOOM_PERCENT_STEP, ZOOM_MAX_LEVEL, ZOOM_MIN_LEVEL)
-from .tasks import task_get_document_image
+from .tasks import task_clear_image_cache, task_get_document_image
 
 logger = logging.getLogger(__name__)
 
@@ -1041,11 +1041,8 @@ def document_clear_image_cache(request):
     previous = request.POST.get('previous', request.GET.get('previous', request.META.get('HTTP_REFERER', reverse(settings.LOGIN_REDIRECT_URL))))
 
     if request.method == 'POST':
-        try:
-            Document.clear_image_cache()
-            messages.success(request, _(u'Document image cache cleared successfully'))
-        except Exception as exception:
-            messages.error(request, _(u'Error clearing document image cache; %s') % exception)
+        task_clear_image_cache.apply_async(queue='tools')
+        messages.success(request, _(u'Document image cache clearing queued successfully.'))
 
         return HttpResponseRedirect(previous)