Remove groups replication code. (#12900)

The replication logic for groups is no longer used, so the message
passing infrastructure can be removed.

synapse/replication/tcp/client.py

@@ -30,7 +30,6 @@ from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
 from synapse.replication.tcp.streams import (
     AccountDataStream,
     DeviceListsStream,
-    GroupServerStream,
     PushersStream,
     PushRulesStream,
     ReceiptsStream,
@@ -185,10 +184,6 @@ class ReplicationDataHandler:
             self.notifier.on_new_event(
                 StreamKeyType.DEVICE_LIST, token, rooms=all_room_ids
             )
-        elif stream_name == GroupServerStream.NAME:
-            self.notifier.on_new_event(
-                "groups_key", token, users=[row.user_id for row in rows]
-            )
         elif stream_name == PushersStream.NAME:
             for row in rows:
                 if row.deleted:

synapse/replication/tcp/streams/__init__.py

@@ -29,7 +29,6 @@ from synapse.replication.tcp.streams._base import (
     BackfillStream,
     CachesStream,
     DeviceListsStream,
-    GroupServerStream,
     PresenceFederationStream,
     PresenceStream,
     PushersStream,
@@ -61,7 +60,6 @@ STREAMS_MAP = {
         FederationStream,
         TagAccountDataStream,
         AccountDataStream,
-        GroupServerStream,
         UserSignatureStream,
     )
 }
@@ -81,6 +79,5 @@ __all__ = [
     "ToDeviceStream",
     "TagAccountDataStream",
     "AccountDataStream",
-    "GroupServerStream",
     "UserSignatureStream",
 ]

synapse/replication/tcp/streams/_base.py

@@ -585,26 +585,6 @@ class AccountDataStream(Stream):
         return updates, to_token, limited
 
 
-class GroupServerStream(Stream):
-    @attr.s(slots=True, frozen=True, auto_attribs=True)
-    class GroupsStreamRow:
-        group_id: str
-        user_id: str
-        type: str
-        content: JsonDict
-
-    NAME = "groups"
-    ROW_TYPE = GroupsStreamRow
-
-    def __init__(self, hs: "HomeServer"):
-        store = hs.get_datastores().main
-        super().__init__(
-            hs.get_instance_name(),
-            current_token_without_instance(store.get_group_stream_token),
-            store.get_all_groups_changes,
-        )
-
-
 class UserSignatureStream(Stream):
     """A user has signed their own device with their user-signing key"""