Update with new api

goblins-echo.scm

@@ -1,4 +1,5 @@
 (use-modules (goblins)
+             (goblins actor-lib methods)
              (goblins vat)
              (goblins ocapn captp)
              (goblins ocapn ids)
@@ -16,20 +17,36 @@
 (define (^listener bcom)
   (lambda (text) (format #t "~a\n" text)))
 
-(define (listen setup-sref)
-  (with-vat echo-vat
+;; Proposal for a registry object that bundles up a netlayer and mycapn into a single two-method capability
+;; See https://community.spritely.institute/t/feedback-on-ocapn-netlayers-interface/407
+(define (^mycapn-registry bcom netlayer netlayer-type)
+  (define mycapn (spawn-mycapn netlayer))
+  (methods
+   [(register obj)
+    ($ mycapn 'register obj netlayer-type)]
+   [(enliven id)
+    ($ mycapn 'enliven id)]))
+
+(define (prelay-sref->mycapn-registry setup-sref)
   (on (fetch-and-spawn-prelay-netlayer setup-sref)
       (lambda (netlayer)
-         (define mycapn (spawn-mycapn netlayer))
+        (spawn ^mycapn-registry netlayer 'prelay))
+      #:promise? #t))
+;; end proposal
+
+(define (listen setup-sref)
+  (with-vat echo-vat
+   (on (prelay-sref->mycapn-registry setup-sref)
+       (lambda (registry)
          (define listener (spawn ^listener))
-         (define listener-id ($ mycapn 'register listener 'prelay))
+         (define listener-id ($ registry 'register listener))
          (format #t "Listener registered at ~s\n" (ocapn-id->string listener-id))))))
 
 (define (say setup-sref listener-sref text)
   (with-vat echo-vat
-   (on (fetch-and-spawn-prelay-netlayer setup-sref)
-       (lambda (netlayer)
-         (on (<- (<- (spawn-mycapn netlayer) 'enliven listener-sref) text)
+   (on (prelay-sref->mycapn-registry setup-sref)
+       (lambda (registry)
+         (on (<- (<- registry 'enliven listener-sref) text)
              (lambda (_)
                (format #t "sent message ~s.\n" text)
                (signal-condition! can-quit?)))))))