NATS JetStream tweaks (#2086)

* Use named NATS durable consumers

* Build fixes

* Remove dupe call to SetFederationAPI

* Use namespaced consumer name

* Fix namespacing

* Fix unit tests hopefully

roomserver/internal/api.go

@@ -67,6 +67,7 @@ func NewRoomserverAPI(
 			InputRoomEventTopic:  inputRoomEventTopic,
 			OutputRoomEventTopic: outputRoomEventTopic,
 			JetStream:            consumer,
+			Durable:              cfg.Matrix.JetStream.Durable("RoomserverInputConsumer"),
 			ServerName:           cfg.Matrix.ServerName,
 			ACLs:                 serverACLs,
 		},

roomserver/internal/input/input.go

@@ -43,6 +43,7 @@ var keyContentFields = map[string]string{
 type Inputer struct {
 	DB                   storage.Database
 	JetStream            nats.JetStreamContext
+	Durable              nats.SubOpt
 	ServerName           gomatrixserverlib.ServerName
 	ACLs                 *acls.ServerACLs
 	InputRoomEventTopic  string
@@ -85,6 +86,8 @@ func (r *Inputer) Start() error {
 		// or nak them within a certain amount of time. This stops that from
 		// happening, so we don't end up doing a lot of unnecessary duplicate work.
 		nats.MaxDeliver(0),
+		// Use a durable named consumer.
+		r.Durable,
 	)
 	return err
 }