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
 }
 

pkg/services/folder/folderimpl/folder.go

@@ -25,6 +25,7 @@ import (
 	"github.com/grafana/grafana/pkg/infra/metrics"
 	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
+	"github.com/grafana/grafana/pkg/services/apiserver"
 	"github.com/grafana/grafana/pkg/services/apiserver/endpoints/request"
 	"github.com/grafana/grafana/pkg/services/dashboards"
 	"github.com/grafana/grafana/pkg/services/dashboards/dashboardaccess"
@@ -76,12 +77,13 @@ func ProvideService(
 	tracer tracing.Tracer,
 ) *Service {
 	k8sHandler := &foldk8sHandler{
-		gvr:        v0alpha1.FolderResourceInfo.GroupVersionResource(),
-		namespacer: request.GetNamespaceMapper(cfg),
-		cfg:        cfg,
+		gvr:                v0alpha1.FolderResourceInfo.GroupVersionResource(),
+		namespacer:         request.GetNamespaceMapper(cfg),
+		cfg:                cfg,
+		restConfigProvider: apiserver.GetRestConfig,
 	}
 
-	unifiedStore := ProvideUnifiedStore(cfg)
+	unifiedStore := ProvideUnifiedStore(k8sHandler)
 
 	srv := &Service{
 		log:                  slog.Default().With("logger", "folder-service"),

pkg/services/folder/folderimpl/folder_unifiedstorage.go

@@ -10,7 +10,7 @@ import (
 	"golang.org/x/exp/slices"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/client-go/dynamic"
-	"k8s.io/client-go/rest"
+	clientrest "k8s.io/client-go/rest"
 
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
 	"github.com/grafana/grafana/pkg/events"
@@ -36,9 +36,10 @@ type folderK8sHandler interface {
 var _ folderK8sHandler = (*foldk8sHandler)(nil)
 
 type foldk8sHandler struct {
-	cfg        *setting.Cfg
-	namespacer request.NamespaceMapper
-	gvr        schema.GroupVersionResource
+	cfg                *setting.Cfg
+	namespacer         request.NamespaceMapper
+	gvr                schema.GroupVersionResource
+	restConfigProvider func(ctx context.Context) *clientrest.Config
 }
 
 func (s *Service) getFoldersFromApiServer(ctx context.Context, q folder.GetFoldersQuery) ([]*folder.Folder, error) {
@@ -680,20 +681,16 @@ func (s *Service) getDescendantCountsFromApiServer(ctx context.Context, q *folde
 // -----------------------------------------------------------------------------------------
 
 func (fk8s *foldk8sHandler) getClient(ctx context.Context, orgID int64) (dynamic.ResourceInterface, bool) {
-	cfg := &rest.Config{
-		Host:    fk8s.cfg.AppURL,
-		APIPath: "/apis",
-		TLSClientConfig: rest.TLSClientConfig{
-			Insecure: true, // Skip TLS verification
-		},
-		Username: fk8s.cfg.AdminUser,
-		Password: fk8s.cfg.AdminPassword,
+	cfg := fk8s.restConfigProvider(ctx)
+	if cfg == nil {
+		return nil, false
 	}
 
 	dyn, err := dynamic.NewForConfig(cfg)
 	if err != nil {
 		return nil, false
 	}
+
 	return dyn.Resource(fk8s.gvr).Namespace(fk8s.getNamespace(orgID)), true
 }
 

pkg/services/folder/folderimpl/folder_unifiedstorage_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	clientrest "k8s.io/client-go/rest"
 
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
 	"github.com/grafana/grafana/pkg/apis/folder/v0alpha1"
@@ -22,6 +23,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/accesscontrol/acimpl"
 	"github.com/grafana/grafana/pkg/services/accesscontrol/actest"
+	"github.com/grafana/grafana/pkg/services/apiserver/endpoints/request"
 	"github.com/grafana/grafana/pkg/services/dashboards"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/folder"
@@ -31,6 +33,16 @@ import (
 	"github.com/grafana/grafana/pkg/services/user"
 )
 
+type rcp struct {
+	Host string
+}
+
+func (r rcp) GetRestConfig(ctx context.Context) *clientrest.Config {
+	return &clientrest.Config{
+		Host: r.Host,
+	}
+}
+
 func TestIntegrationFolderServiceViaUnifiedStorage(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")
@@ -147,7 +159,18 @@ func TestIntegrationFolderServiceViaUnifiedStorage(t *testing.T) {
 	db, cfg := sqlstore.InitTestDB(t)
 	cfg.AppURL = folderApiServerMock.URL
 
-	unifiedStore := ProvideUnifiedStore(cfg)
+	restCfgProvider := rcp{
+		Host: folderApiServerMock.URL,
+	}
+
+	k8sHandler := &foldk8sHandler{
+		gvr:                v0alpha1.FolderResourceInfo.GroupVersionResource(),
+		namespacer:         request.GetNamespaceMapper(cfg),
+		cfg:                cfg,
+		restConfigProvider: restCfgProvider.GetRestConfig,
+	}
+
+	unifiedStore := ProvideUnifiedStore(k8sHandler)
 
 	ctx := context.Background()
 	usr := &user.SignedInUser{UserID: 1, OrgID: 1, Permissions: map[int64]map[string][]string{

pkg/services/folder/folderimpl/unifiedstore.go

@@ -15,9 +15,7 @@ import (
 	"github.com/grafana/grafana/pkg/apis/folder/v0alpha1"
 	"github.com/grafana/grafana/pkg/infra/log"
 	internalfolders "github.com/grafana/grafana/pkg/registry/apis/folders"
-	"github.com/grafana/grafana/pkg/services/apiserver/endpoints/request"
 	"github.com/grafana/grafana/pkg/services/folder"
-	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/util"
 )
 
@@ -29,13 +27,7 @@ type FolderUnifiedStoreImpl struct {
 // sqlStore implements the store interface.
 var _ folder.Store = (*FolderUnifiedStoreImpl)(nil)
 
-func ProvideUnifiedStore(cfg *setting.Cfg) *FolderUnifiedStoreImpl {
-	k8sHandler := &foldk8sHandler{
-		gvr:        v0alpha1.FolderResourceInfo.GroupVersionResource(),
-		namespacer: request.GetNamespaceMapper(cfg),
-		cfg:        cfg,
-	}
-
+func ProvideUnifiedStore(k8sHandler *foldk8sHandler) *FolderUnifiedStoreImpl {
 	return &FolderUnifiedStoreImpl{
 		k8sclient: k8sHandler,
 		log:       log.New("folder-store"),

pkg/storage/unified/apistore/go.sum

@@ -292,6 +292,8 @@ github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8Yc
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 github.com/denisenkom/go-mssqldb v0.0.0-20190707035753-2be1aa521ff4/go.mod h1:zAg7JM8CkOJ43xKXIj7eRO9kmWm/TW578qo+oDO6tuM=
+github.com/dennwc/varint v1.0.0 h1:kGNFFSSw8ToIy3obO/kKr8U9GZYUAxQEVuix4zfDWzE=
+github.com/dennwc/varint v1.0.0/go.mod h1:hnItb35rvZvJrbTALZtY/iQfDs48JKRG1RPpgziApxA=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/dhui/dktest v0.3.0/go.mod h1:cyzIUfGsBEbZ6BT7tnXqAShHSXCZhSNmFl70sZ7c1yc=
@@ -567,12 +569,16 @@ github.com/grafana/grafana-plugin-sdk-go v0.262.0 h1:R2DV6lwBQE5zaogxX3PorD9Seo8
 github.com/grafana/grafana-plugin-sdk-go v0.262.0/go.mod h1:U43Cnrj/9DNYyvFcNdeUWNjMXTKNB0jcTcQGpWKd2gw=
 github.com/grafana/grafana/pkg/aggregator v0.0.0-20250121113133-e747350fee2d h1:aBD5kzsIAh50vjNqUkWK9mNpLGIBYAnKkWtUepGNAiQ=
 github.com/grafana/grafana/pkg/aggregator v0.0.0-20250121113133-e747350fee2d/go.mod h1:1sq0guad+G4SUTlBgx7SXfhnzy7D86K/LcVOtiQCiMA=
+github.com/grafana/grafana/pkg/promlib v0.0.7 h1:BdpanKOKnID/l1BJZLhE7TRNtmq7aOVdou1LBFWaMmU=
+github.com/grafana/grafana/pkg/promlib v0.0.7/go.mod h1:rnwJXCA2xRwb7F27NB35iO/JsLL/H/+eVXECk/hrEhQ=
 github.com/grafana/grafana/pkg/semconv v0.0.0-20250121113133-e747350fee2d h1:cYBjuhb3m5oC6Z00Kw8DdySFaNhwb38SMxx0oXnz5vQ=
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+github.com/grafana/regexp v0.0.0-20240518133315-a468a5bfb3bc h1:GN2Lv3MGO7AS6PrRoT6yV5+wkrOpcszoIsO4+4ds248=
+github.com/grafana/regexp v0.0.0-20240518133315-a468a5bfb3bc/go.mod h1:+JKpmjMGhpgPL+rXZ5nsZieVzvarn86asRlBg4uNGnk=
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@@ -912,6 +918,8 @@ github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4O
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