make client interface

internal/service/service.go

@@ -78,13 +78,18 @@ type Service interface {
 	IsAssignableResource(id gidx.PrefixedID) bool
 }
 
+// EventPublisher defines the required methods to publish events.
+type EventPublisher interface {
+	PublishChange(ctx context.Context, subjectType string, change events.ChangeMessage) error
+}
+
 var _ Service = &service{}
 
 type service struct {
 	logger      *zap.SugaredLogger
-	publisher   *events.Publisher
-	metal       *metal.Client
-	perms       *permissions.Client
+	publisher   EventPublisher
+	metal       metal.Client
+	perms       permissions.Client
 	idPrefixMap map[string]ObjectType
 
 	rootResource prefixedID
@@ -100,7 +105,7 @@ func (r prefixedID) PrefixedID() gidx.PrefixedID {
 }
 
 // New creates a new service.
-func New(publisher *events.Publisher, metal *metal.Client, perms *permissions.Client, options ...Option) (Service, error) {
+func New(publisher EventPublisher, metal metal.Client, perms permissions.Client, options ...Option) (Service, error) {
 	svc := &service{
 		publisher:   publisher,
 		metal:       metal,