noop impl (#32)

* improve logger usage
* add noop client and server

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

server/noop.go

@@ -0,0 +1,108 @@
+package server
+
+import "github.com/unistack-org/micro/v3/registry"
+
+type noopServer struct {
+	h    Handler
+	opts Options
+}
+
+type noopHandler struct {
+	opts HandlerOptions
+	h    interface{}
+}
+
+type noopSubscriber struct {
+	topic string
+	opts  SubscriberOptions
+	h     interface{}
+}
+
+func (n *noopSubscriber) Topic() string {
+	return n.topic
+}
+
+func (n *noopSubscriber) Subscriber() interface{} {
+	return n.h
+}
+
+func (n *noopSubscriber) Endpoints() []*registry.Endpoint {
+	return nil
+}
+
+func (n *noopSubscriber) Options() SubscriberOptions {
+	return n.opts
+}
+
+func (n *noopHandler) Endpoints() []*registry.Endpoint {
+	return nil
+}
+
+func (n *noopHandler) Handler() interface{} {
+	return nil
+}
+
+func (n *noopHandler) Options() HandlerOptions {
+	return n.opts
+}
+
+func (n *noopHandler) Name() string {
+	return "noop"
+}
+
+func (n *noopServer) Handle(handler Handler) error {
+	n.h = handler
+	return nil
+}
+
+func (n *noopServer) Subscribe(subscriber Subscriber) error {
+	//	n.s = handler
+	return nil
+}
+
+func (n *noopServer) NewHandler(h interface{}, opts ...HandlerOption) Handler {
+	options := NewHandlerOptions()
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopHandler{opts: options, h: h}
+}
+
+func (n *noopServer) NewSubscriber(topic string, h interface{}, opts ...SubscriberOption) Subscriber {
+	options := NewSubscriberOptions()
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopSubscriber{topic: topic, opts: options, h: h}
+}
+
+func (n *noopServer) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+	return nil
+}
+
+func (n *noopServer) Start() error {
+	return nil
+}
+
+func (n *noopServer) Stop() error {
+	return nil
+}
+
+func (n *noopServer) Options() Options {
+	return n.opts
+}
+
+func (n *noopServer) String() string {
+	return "noop"
+}
+
+func newServer(opts ...Option) Server {
+	options := NewOptions()
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopServer{opts: options}
+}