fix: [AXIMST-806] returned cache clearing when publishing a course

cms/djangoapps/contentstore/signals/handlers.py

@@ -21,6 +21,7 @@
     CoursewareSearchIndexer,
     LibrarySearchIndexer,
 )
+from cms.djangoapps.contentstore.utils import drop_course_sidebar_blocks_cache
 from common.djangoapps.track.event_transaction_utils import get_event_transaction_id, get_event_transaction_type
 from common.djangoapps.util.block_utils import yield_dynamic_block_descendants
 from lms.djangoapps.grades.api import task_compute_all_grades_for_course
@@ -141,6 +142,7 @@ def listen_for_course_publish(sender, course_key, **kwargs):  # pylint: disable=
     # register special exams asynchronously after the data is ready
     course_key_str = str(course_key)
     transaction.on_commit(lambda: update_special_exams_and_publish.delay(course_key_str))
+    drop_course_sidebar_blocks_cache(course_key_str)
 
     if key_supports_outlines(course_key):
         # Push the course outline to learning_sequences asynchronously.

cms/djangoapps/contentstore/utils.py

@@ -8,10 +8,11 @@
 from collections import defaultdict
 from contextlib import contextmanager
 from datetime import datetime, timezone
-from urllib.parse import quote_plus
+from urllib.parse import quote_plus, unquote
 from uuid import uuid4
 
 from django.conf import settings
+from django.core.cache import cache
 from django.core.exceptions import ValidationError
 from django.urls import reverse
 from django.utils import translation
@@ -2287,3 +2288,36 @@ def get_xblock_render_context(request, block):
         return str(exc)
 
     return ""
+
+
+def drop_course_sidebar_blocks_cache(course_id: str):
+    """
+    Drop the course sidebar blocks cache for the given course.
+    """
+    cache_key_prefix = f"course_sidebar_blocks_{course_id}"
+    cache_keys = get_cache_keys(cache_key_prefix)
+
+    cache.delete_many(cache_keys)
+
+
+def get_cache_keys(cache_key_prefix):
+    """
+    Get all cache keys for the given cache key prefix.
+    LocMemCache does not have a keys method, so we need to iterate over the cache
+    and manually filter out the keys that match the given prefix.
+    """
+    cache_backend = settings.CACHES['default']['BACKEND']
+    if cache_backend == 'django_redis.cache.RedisCache':
+        yield cache.iter_keys(f"{cache_key_prefix}*")
+    elif cache_backend == 'django.core.cache.backends.locmem.LocMemCache':
+        for key in cache._cache.keys():  # pylint: disable=protected-access
+            try:
+                decoded_key = unquote(key.split(':', 2)[-1], encoding='utf-8')
+            except IndexError:
+                continue
+
+            if decoded_key.startswith(cache_key_prefix):
+                yield decoded_key
+    else:
+        log.error(f"Unsupported cache backend: {cache_backend}")
+        yield