Add type hints for the federation sender. (#9681)

Includes an abstract base class which both the FederationSender
and the FederationRemoteSendQueue must implement.

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/server.py b/synapse/server.py

index 5e787e2281..e85b9391fa 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -60,7 +60,7 @@ from synapse.federation.federation_server import (
     FederationServer,
 )
 from synapse.federation.send_queue import FederationRemoteSendQueue
-from synapse.federation.sender import FederationSender
+from synapse.federation.sender import AbstractFederationSender, FederationSender
 from synapse.federation.transport.client import TransportLayerClient
 from synapse.groups.attestations import GroupAttestationSigning, GroupAttestionRenewer
 from synapse.groups.groups_server import GroupsServerHandler, GroupsServerWorkerHandler
@@ -571,7 +571,7 @@ class HomeServer(metaclass=abc.ABCMeta):
         return TransportLayerClient(self)
 
     @cache_in_self
-    def get_federation_sender(self):
+    def get_federation_sender(self) -> AbstractFederationSender:
         if self.should_send_federation():
             return FederationSender(self)
         elif not self.config.worker_app: