many improvements with options and noop stuff

* add many options helpers
* fix noop client to allow publish messages to topic in broker
* fix noop server to allow registering in registry
* fix noop server to allow subscribe to topic in broker
* fix new service initialization

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/options.go

@@ -39,6 +39,10 @@ type Options struct {
 	RegisterTTL time.Duration
 	// The interval on which to register
 	RegisterInterval time.Duration
+	// RegisterAttempts specify how many times try to register
+	RegisterAttempts int
+	// DeegisterAttempts specify how many times try to deregister
+	DeregisterAttempts int
 
 	// The router for requests
 	Router Router
@@ -61,6 +65,8 @@ func NewOptions(opts ...Option) Options {
 		RegisterInterval: DefaultRegisterInterval,
 		RegisterTTL:      DefaultRegisterTTL,
 		RegisterCheck:    DefaultRegisterCheck,
+		Logger:           logger.DefaultLogger,
+		Tracer:           tracer.DefaultTracer,
 		Broker:           broker.DefaultBroker,
 		Registry:         registry.DefaultRegistry,
 		Address:          DefaultAddress,
@@ -255,3 +261,94 @@ func WrapSubscriber(w SubscriberWrapper) Option {
 		o.SubWrappers = append(o.SubWrappers, w)
 	}
 }
+
+type HandlerOption func(*HandlerOptions)
+
+type HandlerOptions struct {
+	Internal bool
+	Metadata map[string]map[string]string
+	Context  context.Context
+}
+
+func NewHandlerOptions(opts ...HandlerOption) HandlerOptions {
+	options := HandlerOptions{
+		Context: context.Background(),
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
+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
+}
+
+func NewSubscriberOptions(opts ...SubscriberOption) SubscriberOptions {
+	options := SubscriberOptions{
+		AutoAck: true,
+		Context: context.Background(),
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return options
+}
+
+// EndpointMetadata is a Handler option that allows metadata to be added to
+// individual endpoints.
+func EndpointMetadata(name string, md map[string]string) HandlerOption {
+	return func(o *HandlerOptions) {
+		o.Metadata[name] = md
+	}
+}
+
+// Internal Handler options specifies that a handler is not advertised
+// to the discovery system. In the future this may also limit request
+// to the internal network or authorised user.
+func InternalHandler(b bool) HandlerOption {
+	return func(o *HandlerOptions) {
+		o.Internal = b
+	}
+}
+
+// Internal Subscriber options specifies that a subscriber is not advertised
+// to the discovery system.
+func InternalSubscriber(b bool) SubscriberOption {
+	return func(o *SubscriberOptions) {
+		o.Internal = b
+	}
+}
+
+// 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) {
+		o.Queue = n
+	}
+}
+
+// SubscriberContext set context options to allow broker SubscriberOption passed
+func SubscriberContext(ctx context.Context) SubscriberOption {
+	return func(o *SubscriberOptions) {
+		o.Context = ctx
+	}
+}