Allow streaming cache invalidate all to workers. (#6749)

synapse/storage/_base.py

@@ -17,6 +17,7 @@
 import logging
 import random
 from abc import ABCMeta
+from typing import Any, Optional
 
 from six import PY2
 from six.moves import builtins
@@ -26,7 +27,7 @@ from canonicaljson import json
 from synapse.storage.database import LoggingTransaction  # noqa: F401
 from synapse.storage.database import make_in_list_sql_clause  # noqa: F401
 from synapse.storage.database import Database
-from synapse.types import get_domain_from_id
+from synapse.types import Collection, get_domain_from_id
 
 logger = logging.getLogger(__name__)
 
@@ -63,17 +64,24 @@ class SQLBaseStore(metaclass=ABCMeta):
         self._attempt_to_invalidate_cache("get_room_summary", (room_id,))
         self._attempt_to_invalidate_cache("get_current_state_ids", (room_id,))
 
-    def _attempt_to_invalidate_cache(self, cache_name, key):
+    def _attempt_to_invalidate_cache(
+        self, cache_name: str, key: Optional[Collection[Any]]
+    ):
         """Attempts to invalidate the cache of the given name, ignoring if the
         cache doesn't exist. Mainly used for invalidating caches on workers,
         where they may not have the cache.
 
         Args:
-            cache_name (str)
-            key (tuple)
+            cache_name
+            key: Entry to invalidate. If None then invalidates the entire
+                cache.
         """
+
         try:
-            getattr(self, cache_name).invalidate(key)
+            if key is None:
+                getattr(self, cache_name).invalidate_all()
+            else:
+                getattr(self, cache_name).invalidate(tuple(key))
         except AttributeError:
             # We probably haven't pulled in the cache in this worker,
             # which is fine.