Enable passing typing stream writers as a list.

changelog.d/11237.misc

@@ -0,0 +1 @@
+Allow `stream_writers.typing` config to be a list of one worker.

synapse/config/workers.py

@@ -63,7 +63,8 @@ class WriterLocations:
 
     Attributes:
         events: The instances that write to the event and backfill streams.
-        typing: The instance that writes to the typing stream.
+        typing: The instances that write to the typing stream. Currently
+            can only be a single instance.
         to_device: The instances that write to the to_device stream. Currently
             can only be a single instance.
         account_data: The instances that write to the account data streams. Currently
@@ -75,9 +76,15 @@ class WriterLocations:
     """
 
     events = attr.ib(
-        default=["master"], type=List[str], converter=_instance_to_list_converter
+        default=["master"],
+        type=List[str],
+        converter=_instance_to_list_converter,
+    )
+    typing = attr.ib(
+        default=["master"],
+        type=List[str],
+        converter=_instance_to_list_converter,
     )
-    typing = attr.ib(default="master", type=str)
     to_device = attr.ib(
         default=["master"],
         type=List[str],
@@ -217,6 +224,11 @@ def read_config(self, config, **kwargs):
                         % (instance, stream)
                     )
 
+        if len(self.writers.typing) != 1:
+            raise ConfigError(
+                "Must only specify one instance to handle `typing` messages."
+            )
+
         if len(self.writers.to_device) != 1:
             raise ConfigError(
                 "Must only specify one instance to handle `to_device` messages."

synapse/federation/federation_server.py

@@ -1232,10 +1232,6 @@ def register_query_handler(
 
         self.query_handlers[query_type] = handler
 
-    def register_instance_for_edu(self, edu_type: str, instance_name: str) -> None:
-        """Register that the EDU handler is on a different instance than master."""
-        self._edu_type_to_instance[edu_type] = [instance_name]
-
     def register_instances_for_edu(
         self, edu_type: str, instance_names: List[str]
     ) -> None:

synapse/handlers/typing.py

@@ -63,7 +63,7 @@ def __init__(self, hs: "HomeServer"):
             self.federation = hs.get_federation_sender()
 
         if hs.config.worker.writers.typing != hs.get_instance_name():
-            hs.get_federation_registry().register_instance_for_edu(
+            hs.get_federation_registry().register_instances_for_edu(
                 "m.typing",
                 hs.config.worker.writers.typing,
             )