Revert "Clean up enrollment rate limit waffles"

This reverts commit 813d59d091.

common/djangoapps/enrollment/__init__.py

@@ -0,0 +1,9 @@
+"""
+Enrollment API helpers and settings
+"""
+from openedx.core.djangoapps.waffle_utils import (WaffleFlag, WaffleFlagNamespace)
+
+WAFFLE_FLAG_NAMESPACE = WaffleFlagNamespace(name='enrollment_api_rate_limit')
+
+REDUCE_RATE_LIMIT_FOR_STAFF_FOR_ENROLLMENT_API = WaffleFlag(WAFFLE_FLAG_NAMESPACE, 'reduce_staff_rate_limit')
+USE_UNIVERSAL_RATE_LIMIT_FOR_ENROLLMENT_API = WaffleFlag(WAFFLE_FLAG_NAMESPACE, 'use_universal_rate_limit')

common/djangoapps/enrollment/views.py

@@ -12,6 +12,8 @@ from django.utils.decorators import method_decorator
 from edx_rest_framework_extensions.authentication import JwtAuthentication
 from enrollment import api
 from enrollment.errors import CourseEnrollmentError, CourseEnrollmentExistsError, CourseModeNotFoundError
+from enrollment import REDUCE_RATE_LIMIT_FOR_STAFF_FOR_ENROLLMENT_API, \
+    USE_UNIVERSAL_RATE_LIMIT_FOR_ENROLLMENT_API
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
 
@@ -76,10 +78,31 @@ class ApiKeyPermissionMixIn(object):
 
 class EnrollmentUserThrottle(UserRateThrottle, ApiKeyPermissionMixIn):
     """Limit the number of requests users can make to the enrollment API."""
+    # TODO: After confirming that reducing the throttle is successful, remove
+    # and clean up waffles. The rate limit has been increased over the course
+    # of a few months to account for unnecessary calls from the ecommerce
+    # service. These calls are no longer made and the plan is to set the
+    # rate limit back to its original state. LEARNER-5148
+
+    # Current rate limit
     THROTTLE_RATES = {
         'user': '40/minute',
+        'staff': '2000/minute',
     }
 
+    # Less aggressive reduction in throttle limit. This should not be necessary
+    if REDUCE_RATE_LIMIT_FOR_STAFF_FOR_ENROLLMENT_API.is_enabled():
+        THROTTLE_RATES = {
+            'user': '40/minute',
+            'staff': '400/minute',
+        }
+
+    # Original rate Limit before rate limit increases.
+    if USE_UNIVERSAL_RATE_LIMIT_FOR_ENROLLMENT_API.is_enabled():
+        THROTTLE_RATES = {
+            'user': '40/minute',
+        }
+
     def allow_request(self, request, view):
         # Use a special scope for staff to allow for a separate throttle rate
         user = request.user