fix: handle case where backend provider no longer exists for timed exams

CHANGELOG.rst

@@ -13,14 +13,17 @@ Change Log
 
 Unreleased
 ~~~~~~~~~~
+* fix timed exam bug for provider that no longer exists
+* fix timed exam reset bug for provider that no longer exists
+* fix instructor dashboard view for provider that no longer exists
 
 [4.17.0]
 ~~~~~~~~~~~~~~~~~~~~~
 * Add support for Python 3.11 & 3.12
 
 [4.16.1] - 2023-08-8
 ~~~~~~~~~~~~~~~~~~~~~
-* Updated django-simple-history package to 3.3.0 
+* Updated django-simple-history package to 3.3.0
 * Created no-op migrations needed for new django-simple-history package version
 
 [4.16.0] - 2023-06-22

edx_proctoring/api.py

@@ -2943,7 +2943,7 @@ def get_student_view(user_id, course_id, content_id,
     is_proctored_exam = exam['is_proctored'] and not exam['is_practice_exam']
     is_timed_exam = not exam['is_proctored'] and not exam['is_practice_exam']
 
-    exam_backend = get_backend_provider(name=exam['backend'])
+    exam_backend = get_backend_provider(exam=exam)
 
     sub_view_func = None
     if is_timed_exam:
@@ -3019,8 +3019,17 @@ def is_backend_dashboard_available(course_id):
         active_only=True
     )
     for exam in exams:
-        if get_backend_provider(name=exam.backend).has_dashboard:
-            return True
+        try:
+            if get_backend_provider(name=exam.backend).has_dashboard:
+                return True
+        except NotImplementedError:
+            log.exception(
+                'No proctoring backend configured for backend=%(backend)s',
+                {
+                    'backend': exam.backend,
+                }
+            )
+
     return False
 
 

edx_proctoring/handlers.py

@@ -127,15 +127,16 @@ def on_attempt_changed(sender, instance, signal, **kwargs):
     else:
         # remove the attempt on the backend
         # timed exams have no backend
-        backend = get_backend_provider(name=instance.proctored_exam.backend)
-        if backend:
-            result = backend.remove_exam_attempt(instance.proctored_exam.external_id, instance.external_id)
-            if not result:
-                log.error(
-                    'Failed to remove attempt_id=%s from backend=%s',
-                    instance.id,
-                    instance.proctored_exam.backend,
-                )
+        if instance.proctored_exam.is_proctored:
+            backend = get_backend_provider(name=instance.proctored_exam.backend)
+            if backend:
+                result = backend.remove_exam_attempt(instance.proctored_exam.external_id, instance.external_id)
+                if not result:
+                    log.error(
+                        'Failed to remove attempt_id=%s from backend=%s',
+                        instance.id,
+                        instance.proctored_exam.backend,
+                    )
 
 
 @receiver(post_delete, sender=models.ProctoredExamStudentAttempt)

edx_proctoring/tests/test_handlers.py

@@ -27,7 +27,7 @@ def setUp(self):
         self.proctored_exam = ProctoredExam.objects.create(
             course_id='x/y/z', content_id=self.content_id, exam_name=self.exam_name,
             time_limit_mins=self.default_time_limit, external_id=self.external_id,
-            backend=self.backend_name
+            backend=self.backend_name, is_proctored=True,
         )
         self.attempt = ProctoredExamStudentAttempt.objects.create(
             proctored_exam=self.proctored_exam, user=self.user, attempt_code='12345',