[__matrix_synapse] add outbound-federation-worker parameter

type/__matrix_synapse/man.rst

@@ -169,6 +169,10 @@ background-tasks-worker
   The worker that is used to run background tasks (e.g. cleaning up expired
   data). If not provided this defaults to the main process.
 
+outbound-federation-worker
+  Worker to be used for sending federation requests. Can be specified multiple
+  times. Disables sending outbound federation requests from the master process.
+
 registration-shared-secret
   If set, allows registration of standard or admin accounts by anyone who
   has the shared secret, even if registration is otherwise disabled.

type/__matrix_synapse/manifest

@@ -266,11 +266,19 @@ fi
 # Worker-mode configuration.
 export MAIN_LISTENER_PORT=8008
 export ENABLE_MEDIA_REPO='true'
-export SEND_FEDERATION_FROM_MAIN_PROCESS='true'
+if [ -f "$__object/parameter/outbound-federation-worker" ]; then
+	FEDERATION_SENDER_INSTANCES=$(cat "$__object/parameter/outbound-federation-worker")
+	export FEDERATION_SENDER_INSTANCES
+fi
 MAIN_LISTENER_RESOURCES="[federation,client]"
 if [ "$EXPOSE_METRICS" = "true" ]; then
 	MAIN_LISTENER_RESOURCES="$(echo "$MAIN_LISTENER_RESOURCES" | tr -d ']'),metrics]"
 fi
+if [ -n "$FEDERATION_SENDER_INSTANCES" ]; then
+	export SEND_FEDERATION_FROM_MAIN_PROCESS='false'
+else
+	export SEND_FEDERATION_FROM_MAIN_PROCESS='true'
+fi
 export MAIN_LISTENER_RESOURCES
 
 ENABLE_REPLICATION=

type/__matrix_synapse/parameter/optional_multiple

@@ -4,3 +4,4 @@ auto-join-room
 app-service-config-file
 extra-setting
 bind-address
+outbound-federation-worker