feat(dataservices): unify access methods and abstract away redundant code [EE-5628] (#9115)

api/dataservices/base_tx.go

@@ -0,0 +1,49 @@
+package dataservices
+
+import (
+	portainer "github.com/portainer/portainer/api"
+
+	"golang.org/x/exp/constraints"
+)
+
+type BaseDataServiceTx[T any, I constraints.Integer] struct {
+	Bucket     string
+	Connection portainer.Connection
+	Tx         portainer.Transaction
+}
+
+func (service BaseDataServiceTx[T, I]) BucketName() string {
+	return service.Bucket
+}
+
+func (service BaseDataServiceTx[T, I]) Read(ID I) (*T, error) {
+	var element T
+	identifier := service.Connection.ConvertToKey(int(ID))
+
+	err := service.Tx.GetObject(service.Bucket, identifier, &element)
+	if err != nil {
+		return nil, err
+	}
+
+	return &element, nil
+}
+
+func (service BaseDataServiceTx[T, I]) ReadAll() ([]T, error) {
+	var collection = make([]T, 0)
+
+	return collection, service.Tx.GetAllWithJsoniter(
+		service.Bucket,
+		new(T),
+		AppendFn(&collection),
+	)
+}
+
+func (service BaseDataServiceTx[T, I]) Update(ID I, element *T) error {
+	identifier := service.Connection.ConvertToKey(int(ID))
+	return service.Tx.UpdateObject(service.Bucket, identifier, element)
+}
+
+func (service BaseDataServiceTx[T, I]) Delete(ID I) error {
+	identifier := service.Connection.ConvertToKey(int(ID))
+	return service.Tx.DeleteObject(service.Bucket, identifier)
+}