feat!: Drop an unnecessary function.

Remove the `enable_storage_backing_for_cache_in_request` function and
its uses in the platform.  The function is no longer needed because the
storage backing for the block_structure cache will be ON by default
moving forward.

BREAKING CHANGE: This `enable_storage_backing_for_cache_in_request`
function no longer exists and any calls to it should be removed.  The
cache it enables is now always ON.

openedx/core/djangoapps/content/block_structure/config/__init__.py

@@ -32,15 +32,6 @@
 )
 
 
-def enable_storage_backing_for_cache_in_request():
-    """
-    Manually override the value of the STORAGE_BACKING_FOR_CACHE switch in the context of the request.
-    This function should not be replicated, as it accesses a protected member, and it shouldn't.
-    """
-    # pylint: disable=protected-access
-    STORAGE_BACKING_FOR_CACHE._cached_switches[STORAGE_BACKING_FOR_CACHE.name] = True
-
-
 @request_cached()
 def num_versions_to_keep():
     """

openedx/core/djangoapps/content/block_structure/management/commands/generate_course_blocks.py

@@ -10,7 +10,6 @@
 import openedx.core.djangoapps.content.block_structure.api as api
 import openedx.core.djangoapps.content.block_structure.store as store
 import openedx.core.djangoapps.content.block_structure.tasks as tasks
-from openedx.core.djangoapps.content.block_structure.config import enable_storage_backing_for_cache_in_request
 from openedx.core.lib.command_utils import (
     get_mutually_exclusive_required_option,
     parse_course_keys,
@@ -75,12 +74,6 @@ def add_arguments(self, parser):
             default=0,
             type=int,
         )
-        parser.add_argument(
-            '--with_storage',
-            help='Store the course blocks in Storage, overriding value of the storage_backing_for_cache waffle switch',
-            action='store_true',
-            default=False,
-        )
 
     def handle(self, *args, **options):
 
@@ -129,9 +122,6 @@ def _generate_course_blocks(self, options, course_keys):
         """
         Generates course blocks for the given course_keys per the given options.
         """
-        if options.get('with_storage'):
-            enable_storage_backing_for_cache_in_request()
-
         for course_key in course_keys:
             try:
                 self._generate_for_course(options, course_key)
@@ -150,7 +140,7 @@ def _generate_for_course(self, options, course_key):
             action = tasks.update_course_in_cache_v2 if options.get('force_update') else tasks.get_course_in_cache_v2
             task_options = {'routing_key': options['routing_key']} if options.get('routing_key') else {}
             result = action.apply_async(
-                kwargs=dict(course_id=str(course_key), with_storage=options.get('with_storage')),
+                kwargs=dict(course_id=str(course_key)),
                 **task_options
             )
             log.info('BlockStructure: ENQUEUED generating for course: %s, task_id: %s.', course_key, result.id)

openedx/core/djangoapps/content/block_structure/tasks.py

@@ -14,7 +14,6 @@
 
 from xmodule.capa.responsetypes import LoncapaProblemError
 from openedx.core.djangoapps.content.block_structure import api
-from openedx.core.djangoapps.content.block_structure.config import enable_storage_backing_for_cache_in_request
 from xmodule.modulestore.exceptions import ItemNotFoundError  # lint-amnesty, pylint: disable=wrong-import-order
 
 log = logging.getLogger('edx.celery.task')
@@ -62,8 +61,6 @@ def _update_course_in_cache(self, **kwargs):
     """
     Updates the course blocks (mongo -> BlockStructure) for the specified course.
     """
-    if kwargs.get('with_storage'):
-        enable_storage_backing_for_cache_in_request()
     _call_and_retry_if_needed(self, api.update_course_in_cache, **kwargs)
 
 
@@ -93,8 +90,6 @@ def _get_course_in_cache(self, **kwargs):
     """
     Gets the course blocks for the specified course, updating the cache if needed.
     """
-    if kwargs.get('with_storage'):
-        enable_storage_backing_for_cache_in_request()
     _call_and_retry_if_needed(self, api.get_course_in_cache, **kwargs)