fix poll/send race condition and panic on errors instead of ignoring

event.go

@@ -4,25 +4,37 @@ type IncomingEvent interface {
 	HandleIncoming(*App)
 }
 type OutgoingEvent interface {
-	HandleOutgoing(*App)
+	HandleOutgoing(*App) error
 }
 
 type Message string
 
 func (m Message) HandleIncoming(app *App) {
 	app.AppendMessage(string(m))
+
 }
-func (m Message) HandleOutgoing(app *App) {
-	num, _ := app.Send(string(m))
+func (m Message) HandleOutgoing(app *App) error {
+	num, err := app.Send(string(m))
+	if err != nil {
+		return err
+	}
 	app.incoming <- SetLast(num)
 
+	return nil
 }
 
 type Poll int
 
-func (p Poll) HandleOutgoing(app *App) {
-	num, _ := app.Poll(int(p))
-	go app.Last(num)
+func (p Poll) HandleOutgoing(app *App) error {
+	num, err := app.Poll(int(p))
+	if err != nil {
+		return err
+	}
+	err = app.Last(num)
+	if err != nil {
+		return err
+	}
+	return nil
 }
 
 type SetLast int