Hide result channel into subscription

hub/subscription.go

@@ -3,7 +3,7 @@ package hub
 type (
 	Subscription struct {
 		Queues []string
-		result chan<- Result
+		result chan Result
 		done   chan struct{}
 	}
 	Result struct {
@@ -12,10 +12,10 @@ type (
 	}
 )
 
-func NewSubscription(queues []string, result chan<- Result) *Subscription {
+func NewSubscription(queues []string) *Subscription {
 	return &Subscription{
 		Queues: queues,
-		result: result,
+		result: make(chan Result),
 		done:   make(chan struct{}),
 	}
 }
@@ -47,10 +47,15 @@ func (s *Subscription) Send(res Result) bool {
 	return <-success
 }
 
+func (s *Subscription) Result() <-chan Result {
+	return s.result
+}
+
 func (s *Subscription) Done() <-chan struct{} {
 	return s.done
 }
 
 func (s *Subscription) Close() {
 	close(s.done)
+	close(s.result)
 }

server/server.go

@@ -75,11 +75,8 @@ func (s *Server) pubHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) subHandler(w http.ResponseWriter, r *http.Request) {
-	result := make(chan hub.Result)
 	queues := strings.Split(r.FormValue("queues"), ",")
-
-	sub := hub.NewSubscription(queues, result)
-	defer sub.Close()
+	sub := hub.NewSubscription(queues)
 
 	finished := make(chan struct{})
 	defer close(finished)
@@ -88,14 +85,15 @@ func (s *Server) subHandler(w http.ResponseWriter, r *http.Request) {
 	go func() {
 		select {
 		case <-disconnected:
-			sub.Close()
 		case <-finished:
 		}
+		sub.Close()
 	}()
 
 	go s.hub.Sub(sub)
-	res := <-result
 
+	if res, ok := <-sub.Result(); ok {
 		w.Header().Set("Queue", res.Queue)
 		w.Write(res.Message)
 	}
+}