Add local_current_membership table (#6655)

Currently we rely on `current_state_events` to figure out what rooms a
user was in and their last membership event in there. However, if the
server leaves the room then the table may be cleaned up and that
information is lost. So lets add a table that separately holds that
information.

changelog.d/6655.misc

@@ -0,0 +1 @@
+Add `local_current_membership` table for tracking local user membership state in rooms.

scripts/synapse_port_db

@@ -470,7 +470,7 @@ class Porter(object):
             engine.check_database(
                 db_conn, allow_outdated_version=allow_outdated_version
             )
-            prepare_database(db_conn, engine, config=None)
+            prepare_database(db_conn, engine, config=self.hs_config)
             store = Store(Database(hs, db_config, engine), db_conn, hs)
             db_conn.commit()
 

synapse/handlers/admin.py

@@ -134,7 +134,7 @@ async def export_user_data(self, user_id, writer):
             The returned value is that returned by `writer.finished()`.
         """
         # Get all rooms the user is in or has been in
-        rooms = await self.store.get_rooms_for_user_where_membership_is(
+        rooms = await self.store.get_rooms_for_local_user_where_membership_is(
             user_id,
             membership_list=(
                 Membership.JOIN,

synapse/handlers/deactivate_account.py

@@ -140,7 +140,7 @@ async def _reject_pending_invites_for_user(self, user_id):
             user_id (str): The user ID to reject pending invites for.
         """
         user = UserID.from_string(user_id)
-        pending_invites = await self.store.get_invited_rooms_for_user(user_id)
+        pending_invites = await self.store.get_invited_rooms_for_local_user(user_id)
 
         for room in pending_invites:
             try:

synapse/handlers/initial_sync.py

@@ -101,7 +101,7 @@ async def _snapshot_all_rooms(
         if include_archived:
             memberships.append(Membership.LEAVE)
 
-        room_list = await self.store.get_rooms_for_user_where_membership_is(
+        room_list = await self.store.get_rooms_for_local_user_where_membership_is(
             user_id=user_id, membership_list=memberships
         )
 

synapse/handlers/room_member.py

@@ -690,7 +690,7 @@ def lookup_room_alias(self, room_alias):
 
     @defer.inlineCallbacks
     def _get_inviter(self, user_id, room_id):
-        invite = yield self.store.get_invite_for_user_in_room(
+        invite = yield self.store.get_invite_for_local_user_in_room(
             user_id=user_id, room_id=room_id
         )
         if invite:

synapse/handlers/search.py

@@ -179,7 +179,7 @@ def search(self, user, content, batch=None):
         search_filter = Filter(filter_dict)
 
         # TODO: Search through left rooms too
-        rooms = yield self.store.get_rooms_for_user_where_membership_is(
+        rooms = yield self.store.get_rooms_for_local_user_where_membership_is(
             user.to_string(),
             membership_list=[Membership.JOIN],
             # membership_list=[Membership.JOIN, Membership.LEAVE, Membership.Ban],

synapse/handlers/sync.py

@@ -1662,7 +1662,7 @@ async def _get_all_rooms(self, sync_result_builder, ignored_users):
             Membership.BAN,
         )
 
-        room_list = await self.store.get_rooms_for_user_where_membership_is(
+        room_list = await self.store.get_rooms_for_local_user_where_membership_is(
             user_id=user_id, membership_list=membership_list
         )
 

synapse/push/push_tools.py

@@ -21,7 +21,7 @@
 
 @defer.inlineCallbacks
 def get_badge_count(store, user_id):
-    invites = yield store.get_invited_rooms_for_user(user_id)
+    invites = yield store.get_invited_rooms_for_local_user(user_id)
     joins = yield store.get_rooms_for_user(user_id)
 
     my_receipts_by_room = yield store.get_receipts_for_user(user_id, "m.read")

synapse/replication/slave/storage/events.py

@@ -152,7 +152,7 @@ def invalidate_caches_for_event(
 
         if etype == EventTypes.Member:
             self._membership_stream_cache.entity_has_changed(state_key, stream_ordering)
-            self.get_invited_rooms_for_user.invalidate((state_key,))
+            self.get_invited_rooms_for_local_user.invalidate((state_key,))
 
         if relates_to:
             self.get_relations_for_event.invalidate_many((relates_to,))

synapse/server_notices/server_notices_manager.py

@@ -105,7 +105,7 @@ def get_notice_room_for_user(self, user_id):
 
         assert self._is_mine_id(user_id), "Cannot send server notices to remote users"
 
-        rooms = yield self._store.get_rooms_for_user_where_membership_is(
+        rooms = yield self._store.get_rooms_for_local_user_where_membership_is(
             user_id, [Membership.INVITE, Membership.JOIN]
         )
         system_mxid = self._config.server_notices_mxid

synapse/storage/data_stores/main/events.py

@@ -128,6 +128,7 @@ def _censor_redactions():
             hs.get_clock().looping_call(_censor_redactions, 5 * 60 * 1000)
 
         self._ephemeral_messages_enabled = hs.config.enable_ephemeral_messages
+        self.is_mine_id = hs.is_mine_id
 
     @defer.inlineCallbacks
     def _read_forward_extremities(self):
@@ -547,6 +548,34 @@ def _update_current_state_txn(self, txn, state_delta_by_room, stream_id):
                 ],
             )
 
+            # Note: Do we really want to delete rows here (that we do not
+            # subsequently reinsert below)? While technically correct it means
+            # we have no record of the fact the user *was* a member of the
+            # room but got, say, state reset out of it.
+            if to_delete or to_insert:
+                txn.executemany(
+                    "DELETE FROM local_current_membership"
+                    " WHERE room_id = ? AND user_id = ?",
+                    (
+                        (room_id, state_key)
+                        for etype, state_key in itertools.chain(to_delete, to_insert)
+                        if etype == EventTypes.Member and self.is_mine_id(state_key)
+                    ),
+                )
+
+            if to_insert:
+                txn.executemany(
+                    """INSERT INTO local_current_membership
+                        (room_id, user_id, event_id, membership)
+                    VALUES (?, ?, ?, (SELECT membership FROM room_memberships WHERE event_id = ?))
+                    """,
+                    [
+                        (room_id, key[1], ev_id, ev_id)
+                        for key, ev_id in to_insert.items()
+                        if key[0] == EventTypes.Member and self.is_mine_id(key[1])
+                    ],
+                )
+
             txn.call_after(
                 self._curr_state_delta_stream_cache.entity_has_changed,
                 room_id,
@@ -1724,6 +1753,7 @@ def _purge_room_txn(self, txn, room_id):
             "local_invites",
             "room_account_data",
             "room_tags",
+            "local_current_membership",
         ):
             logger.info("[purge] removing %s from %s", room_id, table)
             txn.execute("DELETE FROM %s WHERE room_id=?" % (table,), (room_id,))