add noop broker and noop store (#30)

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

broker/broker.go

@@ -2,7 +2,7 @@
 package broker
 
 var (
-	DefaultBroker Broker
+	DefaultBroker Broker = newBroker()
 )
 
 // Broker is an interface used for asynchronous messaging.

broker/noop.go

@@ -0,0 +1,74 @@
+package broker
+
+type noopBroker struct {
+	opts Options
+}
+
+type noopSubscriber struct {
+	topic string
+	opts  SubscribeOptions
+}
+
+func (n *noopBroker) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+
+	return nil
+}
+
+func (n *noopBroker) Options() Options {
+	return n.opts
+}
+
+func (n *noopBroker) Address() string {
+	return ""
+}
+
+func (n *noopBroker) Connect() error {
+	return nil
+}
+
+func (n *noopBroker) Disconnect() error {
+	return nil
+}
+
+func (n *noopBroker) Publish(topic string, m *Message, opts ...PublishOption) error {
+	return nil
+}
+
+func (n *noopBroker) Subscribe(topic string, h Handler, opts ...SubscribeOption) (Subscriber, error) {
+	options := NewSubscribeOptions()
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	return &noopSubscriber{topic: topic, opts: options}, nil
+}
+
+func (n *noopBroker) String() string {
+	return "noop"
+}
+
+func (n *noopSubscriber) Options() SubscribeOptions {
+	return n.opts
+}
+
+func (n *noopSubscriber) Topic() string {
+	return n.topic
+}
+
+func (n *noopSubscriber) Unsubscribe() error {
+	return nil
+}
+
+// newBroker returns a new noop broker
+func newBroker(opts ...Option) Broker {
+	options := NewOptions()
+
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopBroker{opts: options}
+}

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

store/noop.go

@@ -1,13 +1,26 @@
 package store
 
-type noopStore struct{}
+type noopStore struct {
+	opts Options
+}
+
+func newStore(opts ...Option) Store {
+	options := NewOptions()
+	for _, o := range opts {
+		o(&options)
+	}
+	return &noopStore{opts: options}
+}
 
 func (n *noopStore) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
 	return nil
 }
 
 func (n *noopStore) Options() Options {
-	return Options{}
+	return n.opts
 }
 
 func (n *noopStore) String() string {

store/options.go

@@ -23,6 +23,13 @@ type Options struct {
 	Context context.Context
 }
 
+func NewOptions() Options {
+	return Options{
+		Logger:  logger.DefaultLogger,
+		Context: context.Background(),
+	}
+}
+
 // Option sets values in Options
 type Option func(o *Options)
 

store/store.go

@@ -10,7 +10,7 @@ import (
 var (
 	// ErrNotFound is returned when a key doesn't exist
 	ErrNotFound        = errors.New("not found")
-	DefaultStore Store
+	DefaultStore Store = newStore()
 )
 
 // Store is a data storage interface