Use the Django cache for sandboxed code execution.

common/lib/capa/capa/capa_problem.py

@@ -462,7 +462,13 @@ class LoncapaProblem(object):
 
         if all_code:
             try:
-                safe_exec.safe_exec(all_code, context, random_seed=self.seed, python_path=python_path)
+                safe_exec.safe_exec(
+                    all_code,
+                    context,
+                    random_seed=self.seed,
+                    python_path=python_path,
+                    cache=self.system.cache,
+                )
             except Exception as err:
                 log.exception("Error while execing script code: " + all_code)
                 msg = "Error while executing script code: %s" % str(err).replace('<', '&lt;')

common/lib/capa/capa/responsetypes.py

@@ -938,7 +938,7 @@ class CustomResponse(LoncapaResponse):
                             'ans': ans,
                         }
                         globals_dict.update(kwargs)
-                        safe_exec.safe_exec(code, globals_dict)
+                        safe_exec.safe_exec(code, globals_dict, cache=self.system.cache)
                         return globals_dict['cfn_return']
                     return check_function
 
@@ -1055,7 +1055,7 @@ class CustomResponse(LoncapaResponse):
         # exec the check function
         if isinstance(self.code, basestring):
             try:
-                safe_exec.safe_exec(self.code, self.context)
+                safe_exec.safe_exec(self.code, self.context, cache=self.system.cache)
             except Exception as err:
                 self._handle_exec_exception(err)
 
@@ -1783,7 +1783,7 @@ class SchematicResponse(LoncapaResponse):
             json.loads(student_answers[k]) for k in sorted(self.answer_ids)
         ]
         self.context.update({'submission': submission})
-        safe_exec.safe_exec(self.code, self.context)
+        safe_exec.safe_exec(self.code, self.context, cache=self.system.cache)
         cmap = CorrectMap()
         cmap.set_dict(dict(zip(sorted(self.answer_ids), self.context['correct'])))
         return cmap

common/lib/capa/capa/tests/__init__.py

@@ -33,5 +33,6 @@ test_system = Mock(
     debug=True,
     xqueue={'interface': xqueue_interface, 'construct_callback': calledback_url, 'default_queuename': 'testqueue', 'waittime': 10},
     node_path=os.environ.get("NODE_PATH", "/usr/local/lib/node_modules"),
-    anonymous_student_id='student'
+    anonymous_student_id='student',
+    cache=None,
 )

lms/djangoapps/courseware/module_render.py

@@ -8,6 +8,7 @@ from functools import partial
 
 from django.conf import settings
 from django.contrib.auth.models import User
+from django.core.cache import cache
 from django.core.exceptions import PermissionDenied
 from django.core.urlresolvers import reverse
 from django.http import Http404
@@ -299,6 +300,7 @@ def get_module_for_descriptor(user, request, descriptor, model_data_cache, cours
                           course_id=course_id,
                           open_ended_grading_interface=open_ended_grading_interface,
                           s3_interface=s3_interface,
+                          cache=cache,
                           )
     # pass position specified in URL to module through ModuleSystem
     system.set('position', position)