PanelLibrary: Adds library_panel table (#29565)

* PanelLibrary: Adds panellib table

* Refactor: removes drop table migration

* Refactor: fixes spelling mistake

* Refactor: changes after PR comments

* Refactor: some more renames

pkg/server/server.go

@@ -35,6 +35,7 @@ import (
 	_ "github.com/grafana/grafana/pkg/services/alerting"
 	_ "github.com/grafana/grafana/pkg/services/auth"
 	_ "github.com/grafana/grafana/pkg/services/cleanup"
+	_ "github.com/grafana/grafana/pkg/services/librarypanels"
 	_ "github.com/grafana/grafana/pkg/services/ngalert"
 	_ "github.com/grafana/grafana/pkg/services/notifications"
 	_ "github.com/grafana/grafana/pkg/services/provisioning"

pkg/services/librarypanels/librarypanels.go

+package librarypanels
+
+import (
+	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/registry"
+	"github.com/grafana/grafana/pkg/services/sqlstore/migrator"
+	"github.com/grafana/grafana/pkg/setting"
+)
+
+// LibraryPanelService is the service for the Panel Library feature.
+type LibraryPanelService struct {
+	Cfg *setting.Cfg `inject:""`
+	log log.Logger
+}
+
+func init() {
+	registry.RegisterService(&LibraryPanelService{})
+}
+
+// Init initializes the LibraryPanel service
+func (pl *LibraryPanelService) Init() error {
+	pl.log = log.New("library_panel")
+
+	return nil
+}
+
+// IsEnabled returns true if the Panel Library feature is enabled for this instance.
+func (pl *LibraryPanelService) IsEnabled() bool {
+	if pl.Cfg == nil {
+		return false
+	}
+
+	return pl.Cfg.IsPanelLibraryEnabled()
+}
+
+// AddMigration defines database migrations.
+// If Panel Library is not enabled does nothing.
+func (pl *LibraryPanelService) AddMigration(mg *migrator.Migrator) {
+	if !pl.IsEnabled() {
+		return
+	}
+
+	libraryPanelV1 := migrator.Table{
+		Name: "library_panel",
+		Columns: []*migrator.Column{
+			{Name: "id", Type: migrator.DB_BigInt, IsPrimaryKey: true, IsAutoIncrement: true},
+			{Name: "org_id", Type: migrator.DB_BigInt, Nullable: false},
+			{Name: "folder_id", Type: migrator.DB_BigInt, Nullable: false},
+			{Name: "title", Type: migrator.DB_NVarchar, Length: 255, Nullable: false},
+			{Name: "data", Type: migrator.DB_Text, Nullable: false},
+			{Name: "created", Type: migrator.DB_DateTime, Nullable: false},
+			{Name: "created_by", Type: migrator.DB_BigInt, Nullable: false},
+			{Name: "updated", Type: migrator.DB_DateTime, Nullable: false},
+			{Name: "updated_by", Type: migrator.DB_BigInt, Nullable: false},
+		},
+	}
+
+	mg.AddMigration("create library_panel table v1", migrator.NewAddTableMigration(libraryPanelV1))
+}