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>

network/transport/noop.go

@@ -0,0 +1,70 @@
+package transport
+
+type NoopTransport struct {
+	opts Options
+}
+
+func (t *NoopTransport) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&t.opts)
+	}
+	return nil
+}
+
+func (t *NoopTransport) Options() Options {
+	return t.opts
+}
+
+func (t *NoopTransport) Dial(addr string, opts ...DialOption) (Client, error) {
+	options := NewDialOptions(opts...)
+	return &noopClient{opts: options}, nil
+}
+
+func (t *NoopTransport) Listen(addr string, opts ...ListenOption) (Listener, error) {
+	options := NewListenOptions(opts...)
+	return &noopListener{opts: options}, nil
+}
+
+func (t *NoopTransport) String() string {
+	return "noop"
+}
+
+type noopClient struct {
+	opts DialOptions
+}
+
+func (c *noopClient) Close() error {
+	return nil
+}
+
+func (c *noopClient) Local() string {
+	return ""
+}
+
+func (c *noopClient) Remote() string {
+	return ""
+}
+
+func (c *noopClient) Recv(*Message) error {
+	return nil
+}
+
+func (c *noopClient) Send(*Message) error {
+	return nil
+}
+
+type noopListener struct {
+	opts ListenOptions
+}
+
+func (l *noopListener) Addr() string {
+	return ""
+}
+
+func (l *noopListener) Accept(fn func(Socket)) error {
+	return nil
+}
+
+func (l *noopListener) Close() error {
+	return nil
+}

network/transport/options.go

@@ -106,6 +106,12 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+func Context(ctx context.Context) Option {
+	return func(o *Options) {
+		o.Context = ctx
+	}
+}
+
 // Codec sets the codec used for encoding where the transport
 // does not support message headers
 func Codec(c codec.Marshaler) Option {

network/transport/transport.go

@@ -6,7 +6,7 @@ import (
 )
 
 var (
-	DefaultTransport Transport
+	DefaultTransport Transport = &NoopTransport{opts: NewOptions()}
 )
 
 // Transport is an interface which is used for communication between