Remove check current state membership up to date (#13745)

* Remove checks for membership column in current_state_events
* Add schema script to force through the
  `current_state_events_membership` background job

Contributed by Nick @ Beeper (@fizzadar).

1 files changed, 52 insertions, 0 deletions

diff --git a/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py b/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py
new file mode 100644

index 0000000000..b5853d125c
--- /dev/null
+++ b/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py
@@ -0,0 +1,52 @@
+# Copyright 2022 Beeper
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+"""
+Forces through the `current_state_events_membership` background job so checks
+for its completion can be removed.
+
+Note the background job must still remain defined in the database class.
+"""
+
+
+def run_upgrade(cur, database_engine, *args, **kwargs):
+    cur.execute("SELECT update_name FROM background_updates")
+    rows = cur.fetchall()
+    for row in rows:
+        if row[0] == "current_state_events_membership":
+            break
+    # No pending background job so nothing to do here
+    else:
+        return
+
+    # Populate membership field for all current_state_events, this may take
+    # a while but was originally handled via a background update in 2019.
+    cur.execute(
+        """
+        UPDATE current_state_events
+        SET membership = (
+            SELECT membership FROM room_memberships
+            WHERE event_id = current_state_events.event_id
+        )
+        """
+    )
+
+    # Finally, delete the background job because we've handled it above
+    cur.execute(
+        """
+        DELETE FROM background_updates
+        WHERE update_name = 'current_state_events_membership'
+        """
+    )