add logic to delete and srore sub

storage/storage.go

@@ -11,6 +11,7 @@ type Storage interface {
 	GetEvent(string) (*Event, error)
 	GetEvents(namespaces []string) ([]Event, error)
 	AddSubscription(eventid string, subscription Subscription) error
+	UpdateSubscription(eventid string, subscriber string, deletesubscription Subscription) error
 }
 type StorageImpl struct {
 }