Update the way flags are used

server/rpc_server.go

@@ -105,12 +105,13 @@ func (s *rpcServer) Options() Options {
 	return opts
 }
 
-func (s *rpcServer) Init(opts ...Option) {
+func (s *rpcServer) Init(opts ...Option) error {
 	s.Lock()
 	for _, opt := range opts {
 		opt(&s.opts)
 	}
 	s.Unlock()
+	return nil
 }
 
 func (s *rpcServer) NewHandler(h interface{}) Handler {

server/server.go

@@ -40,7 +40,7 @@ import (
 
 type Server interface {
 	Options() Options
-	Init(...Option)
+	Init(...Option) error
 	Handle(Handler) error
 	NewHandler(interface{}) Handler
 	NewSubscriber(string, interface{}) Subscriber