add AutoAck support for Server

server/handler.go

@@ -12,6 +12,9 @@ type HandlerOptions struct {
 type SubscriberOption func(*SubscriberOptions)
 
 type SubscriberOptions struct {
+	// AutoAck defaults to true. When a handler returns
+	// with a nil error the message is acked.
+	AutoAck  bool
 	Queue    string
 	Internal bool
 	Context  context.Context
@@ -43,6 +46,7 @@ func InternalSubscriber(b bool) SubscriberOption {
 }
 func NewSubscriberOptions(opts ...SubscriberOption) SubscriberOptions {
 	opt := SubscriberOptions{
+		AutoAck: true,
 		Context: context.Background(),
 	}
 
@@ -53,6 +57,14 @@ func NewSubscriberOptions(opts ...SubscriberOption) SubscriberOptions {
 	return opt
 }
 
+// DisableAutoAck will disable auto acking of messages
+// after they have been handled.
+func DisableAutoAck() SubscriberOption {
+	return func(o *SubscriberOptions) {
+		o.AutoAck = false
+	}
+}
+
 // Shared queue name distributed messages across subscribers
 func SubscriberQueue(n string) SubscriberOption {
 	return func(o *SubscriberOptions) {

server/rpc_server.go

@@ -365,9 +365,15 @@ func (s *rpcServer) Register() error {
 		if queue := sb.Options().Queue; len(queue) > 0 {
 			opts = append(opts, broker.Queue(queue))
 		}
+
 		if cx := sb.Options().Context; cx != nil {
 			opts = append(opts, broker.SubscribeContext(cx))
 		}
+
+		if !sb.Options().AutoAck {
+			opts = append(opts, broker.DisableAutoAck())
+		}
+
 		sub, err := config.Broker.Subscribe(sb.Topic(), handler, opts...)
 		if err != nil {
 			return err

server/subscriber.go

@@ -34,7 +34,10 @@ type subscriber struct {
 }
 
 func newSubscriber(topic string, sub interface{}, opts ...SubscriberOption) Subscriber {
-	var options SubscriberOptions
+	options := SubscriberOptions{
+		AutoAck: true,
+	}
+
 	for _, o := range opts {
 		o(&options)
 	}