add noop broker and noop store (#30)

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

registry/noop.go

@@ -1,17 +1,20 @@
 package registry
 
-import (
-	"errors"
-)
+import "fmt"
 
-type noopRegistry struct{}
+type noopRegistry struct {
+	opts Options
+}
 
-func (n *noopRegistry) Init(...Option) error {
+func (n *noopRegistry) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
 	return nil
 }
 
 func (n *noopRegistry) Options() Options {
-	return Options{}
+	return n.opts
 }
 
 func (n *noopRegistry) Register(*Service, ...RegisterOption) error {
@@ -31,14 +34,20 @@ func (n *noopRegistry) ListServices(...ListOption) ([]*Service, error) {
 }
 
 func (n *noopRegistry) Watch(...WatchOption) (Watcher, error) {
-	return nil, errors.New("not implemented")
+	return nil, fmt.Errorf("not implemented")
 }
 
 func (n *noopRegistry) String() string {
 	return "noop"
 }
 
-// NewRegistry returns a new noop registry
-func NewRegistry(...Option) Registry {
-	return &noopRegistry{}
+// newRegistry returns a new noop registry
+func newRegistry(opts ...Option) Registry {
+	options := NewOptions()
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return &noopRegistry{opts: options}
 }

registry/options.go

@@ -19,6 +19,13 @@ type Options struct {
 	Context context.Context
 }
 
+func NewOptions() Options {
+	return Options{
+		Logger:  logger.DefaultLogger,
+		Context: context.Background(),
+	}
+}
+
 type RegisterOptions struct {
 	TTL time.Duration
 	// Other options for implementations of the interface

registry/registry.go

@@ -13,7 +13,7 @@ const (
 )
 
 var (
-	DefaultRegistry Registry = NewRegistry()
+	DefaultRegistry Registry = newRegistry()
 	// ErrNotFound returned when GetService is called and no services found
 	ErrNotFound = errors.New("service not found")
 	// ErrWatcherStopped returned when when watcher is stopped