Adds error handling for password reset

This patch enables handling of UserAPIInternalError on password
reset , instead of throwing 500 to user. We are showing user
a message if UserAPIInternalError is raised.

LEARNER-2571

lms/djangoapps/student_account/test/test_views.py

@@ -44,6 +44,7 @@ from student_account.views import account_settings_context, get_user_orders
 from third_party_auth.tests.testutil import ThirdPartyAuthTestMixin, simulate_running_pipeline
 from util.testing import UrlResetMixin
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+from openedx.core.djangoapps.user_api.errors import UserAPIInternalError
 
 LOGGER_NAME = 'audit'
 User = get_user_model()  # pylint:disable=invalid-name
@@ -131,6 +132,12 @@ class StudentAccountUpdateTest(CacheIsolationTestCase, UrlResetMixin):
         result = self.client.login(username=self.USERNAME, password=self.NEW_PASSWORD)
         self.assertTrue(result)
 
+    def test_password_change_failure(self):
+        with mock.patch('openedx.core.djangoapps.user_api.accounts.api.request_password_change',
+                        side_effect=UserAPIInternalError):
+            self._change_password()
+            self.assertRaises(UserAPIInternalError)
+
     @ddt.data(True, False)
     def test_password_change_logged_out(self, send_email):
         # Log the user out

lms/djangoapps/student_account/views.py

@@ -34,7 +34,10 @@ from openedx.core.djangoapps.user_api.api import (
     get_login_session_form,
     get_password_reset_form
 )
-from openedx.core.djangoapps.user_api.errors import UserNotFound
+from openedx.core.djangoapps.user_api.errors import (
+    UserNotFound,
+    UserAPIInternalError
+)
 from openedx.core.lib.edx_api_utils import get_edx_api_data
 from openedx.core.lib.time_zone_utils import TIME_ZONE_CHOICES
 from openedx.features.enterprise_support.api import enterprise_customer_for_request
@@ -213,6 +216,10 @@ def password_change_request_handler(request):
             AUDIT_LOG.info("Invalid password reset attempt")
             # Increment the rate limit counter
             limiter.tick_bad_request_counter(request)
+        except UserAPIInternalError as err:
+            log.exception('Error occured during password change for user {email}: {error}'
+                          .format(email=email, error=err))
+            return HttpResponse(_("Some error occured during password change. Please try again"), status=500)
 
         return HttpResponse(status=200)
     else: