Unistore: Avoid circular dependency when injecting restcfgprovider into FolderSvc (#99295)

* Avoid circular dependency when getting a restCfgProvider for Folder Svc

Signed-off-by: Maicon Costa <maiconscosta@gmail.com>

---------

Signed-off-by: Maicon Costa <maiconscosta@gmail.com>

pkg/services/apiserver/service.go

@@ -71,6 +71,10 @@ var (
 		&metav1.PartialObjectMetadata{},
 		&metav1.PartialObjectMetadataList{},
 	}
+
+	// internal provider of the package level client Config
+	restConfig RestConfigProvider
+	ready      = make(chan struct{})
 )
 
 func init() {
@@ -79,6 +83,17 @@ func init() {
 	Scheme.AddUnversionedTypes(unversionedVersion, unversionedTypes...)
 }
 
+// GetRestConfig return a client Config mounted at package level
+// This resolves circular dependency issues between apiserver, authz,
+// and Folder Service.
+// The client Config gets initialized during the first call to
+// ProvideService.
+// Any call to GetRestConfig will block until we have a restConfig available
+func GetRestConfig(ctx context.Context) *clientrest.Config {
+	<-ready
+	return restConfig.GetRestConfig(ctx)
+}
+
 type Service interface {
 	services.NamedService
 	registry.BackgroundService
@@ -210,6 +225,12 @@ func ProvideService(
 	s.rr.Group("/openapi", proxyHandler)
 	s.rr.Group("/version", proxyHandler)
 
+	// only set the package level restConfig once
+	if restConfig == nil {
+		restConfig = s
+		close(ready)
+	}
+
 	return s, nil
 }