feat(uac): add multi user management and UAC (#647)

api/bolt/version_service.go

@@ -0,0 +1,58 @@
+package bolt
+
+import (
+	"strconv"
+
+	"github.com/portainer/portainer"
+
+	"github.com/boltdb/bolt"
+)
+
+// EndpointService represents a service for managing users.
+type VersionService struct {
+	store *Store
+}
+
+const (
+	DBVersionKey = "DB_VERSION"
+)
+
+// DBVersion the stored database version.
+func (service *VersionService) DBVersion() (int, error) {
+	var data []byte
+	err := service.store.db.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(versionBucketName))
+		value := bucket.Get([]byte(DBVersionKey))
+		if value == nil {
+			return portainer.ErrDBVersionNotFound
+		}
+
+		data = make([]byte, len(value))
+		copy(data, value)
+		return nil
+	})
+	if err != nil {
+		return 0, err
+	}
+
+	dbVersion, err := strconv.Atoi(string(data))
+	if err != nil {
+		return 0, err
+	}
+
+	return dbVersion, nil
+}
+
+// StoreDBVersion store the database version.
+func (service *VersionService) StoreDBVersion(version int) error {
+	return service.store.db.Update(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(versionBucketName))
+
+		data := []byte(strconv.Itoa(version))
+		err := bucket.Put([]byte(DBVersionKey), data)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+}