NestedFolders: Add folder service registry with dashboard service implementation (#65033)

* Delete folders, dashboards with registry service
Co-authored-by: Serge Zaitsev <hello@zserge.com>
* Update signature of ProvideDashboardServiceImpl
* Regenerate mockery file
* Add test for DeleteInFolder
* Add test for DeleteDashboardsInFolder
* Delete child dashboard associations via registry
* Add validation of folder uid and org id

---------

Co-authored-by: Serge Zaitsev <hello@zserge.com>

pkg/services/folder/folderimpl/folder.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/grafana/grafana/pkg/bus"
@@ -36,6 +37,9 @@ type Service struct {
 
 	// bus is currently used to publish event in case of title change
 	bus bus.Bus
+
+	mutex    sync.RWMutex
+	registry map[string]folder.RegistryService
 }
 
 func ProvideService(
@@ -58,6 +62,7 @@ func ProvideService(
 		accessControl:        ac,
 		bus:                  bus,
 		db:                   db,
+		registry:             make(map[string]folder.RegistryService),
 	}
 	if features.IsEnabled(featuremgmt.FlagNestedFolders) {
 		srv.DBMigration(db)
@@ -437,6 +442,12 @@ func (s *Service) Delete(ctx context.Context, cmd *folder.DeleteFolderCommand) e
 	if cmd.SignedInUser == nil {
 		return folder.ErrBadRequest.Errorf("missing signed in user")
 	}
+	if cmd.UID == "" {
+		return folder.ErrBadRequest.Errorf("missing UID")
+	}
+	if cmd.OrgID < 1 {
+		return folder.ErrBadRequest.Errorf("invalid orgID")
+	}
 	result := []string{cmd.UID}
 	err := s.db.InTransaction(ctx, func(ctx context.Context) error {
 		if s.features.IsEnabled(featuremgmt.FlagNestedFolders) {
@@ -466,6 +477,11 @@ func (s *Service) Delete(ctx context.Context, cmd *folder.DeleteFolderCommand) e
 				}
 				return dashboards.ErrFolderAccessDenied
 			}
+
+			if err := s.deleteChildrenInFolder(ctx, dashFolder.OrgID, dashFolder.UID); err != nil {
+				return err
+			}
+
 			err = s.legacyDelete(ctx, cmd, dashFolder)
 			if err != nil {
 				return err
@@ -477,6 +493,15 @@ func (s *Service) Delete(ctx context.Context, cmd *folder.DeleteFolderCommand) e
 	return err
 }
 
+func (s *Service) deleteChildrenInFolder(ctx context.Context, orgID int64, UID string) error {
+	for _, v := range s.registry {
+		if err := v.DeleteInFolder(ctx, orgID, UID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (s *Service) legacyDelete(ctx context.Context, cmd *folder.DeleteFolderCommand, dashFolder *folder.Folder) error {
 	deleteCmd := dashboards.DeleteDashboardCommand{OrgID: cmd.OrgID, ID: dashFolder.ID, ForceDeleteFolderRules: cmd.ForceDeleteRules}
 
@@ -588,7 +613,8 @@ func (s *Service) nestedFolderDelete(ctx context.Context, cmd *folder.DeleteFold
 		}
 		result = append(result, subfolders...)
 	}
-	logger.Info("deleting folder", "org_id", cmd.OrgID, "uid", cmd.UID)
+
+	logger.Info("deleting folder and its contents", "org_id", cmd.OrgID, "uid", cmd.UID)
 	err = s.store.Delete(ctx, cmd.UID, cmd.OrgID)
 	if err != nil {
 		logger.Info("failed deleting folder", "org_id", cmd.OrgID, "uid", cmd.UID, "err", err)
@@ -794,3 +820,17 @@ func toFolderError(err error) error {
 
 	return err
 }
+
+func (s *Service) RegisterService(r folder.RegistryService) error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	_, ok := s.registry[r.Kind()]
+	if ok {
+		return folder.ErrTargetRegistrySrvConflict.Errorf("target registry service: %s already exists", r.Kind())
+	}
+
+	s.registry[r.Kind()] = r
+
+	return nil
+}