micro: rewrite options to support multiple building blocks

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

register/noop.go

@@ -0,0 +1,85 @@
+package register
+
+import (
+	"context"
+)
+
+type noopRegister struct {
+	opts Options
+}
+
+func (n *noopRegister) Name() string {
+	return n.opts.Name
+}
+
+// Init initialize register
+func (n *noopRegister) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+	return nil
+}
+
+// Options returns options struct
+func (n *noopRegister) Options() Options {
+	return n.opts
+}
+
+// Connect opens connection to register
+func (n *noopRegister) Connect(ctx context.Context) error {
+	return nil
+}
+
+// Disconnect close connection to register
+func (n *noopRegister) Disconnect(ctx context.Context) error {
+	return nil
+}
+
+// Register registers service
+func (n *noopRegister) Register(ctx context.Context, svc *Service, opts ...RegisterOption) error {
+	return nil
+}
+
+// Deregister deregisters service
+func (n *noopRegister) Deregister(ctx context.Context, svc *Service, opts ...DeregisterOption) error {
+	return nil
+}
+
+// LookupService returns servive info
+func (n *noopRegister) LookupService(ctx context.Context, name string, opts ...LookupOption) ([]*Service, error) {
+	return []*Service{}, nil
+}
+
+// ListServices listing services
+func (n *noopRegister) ListServices(ctx context.Context, opts ...ListOption) ([]*Service, error) {
+	return []*Service{}, nil
+}
+
+// Watch is used to watch for service changes
+func (n *noopRegister) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+	return &noopWatcher{done: make(chan struct{}), opts: NewWatchOptions(opts...)}, nil
+}
+
+// String returns register string representation
+func (n *noopRegister) String() string {
+	return "noop"
+}
+
+type noopWatcher struct {
+	opts WatchOptions
+	done chan struct{}
+}
+
+func (n *noopWatcher) Next() (*Result, error) {
+	<-n.done
+	return nil, ErrWatcherStopped
+}
+
+func (n *noopWatcher) Stop() {
+	close(n.done)
+}
+
+// NewRegister returns a new noop register
+func NewRegister(opts ...Option) Register {
+	return &noopRegister{opts: NewOptions(opts...)}
+}