Dashboards: Backend schema version migration (#99392)

pkg/apis/dashboard/migration/schemaversion/errors.go

@@ -0,0 +1,40 @@
+package schemaversion
+
+import "fmt"
+
+var _ error = &MinimumVersionError{}
+var _ error = &MigrationError{}
+
+// MinimumVersionError is an error that is returned when the schema version is below the minimum version.
+func NewMinimumVersionError(inputVersion int) *MinimumVersionError {
+	return &MinimumVersionError{inputVersion: inputVersion}
+}
+
+// MinimumVersionError is an error type for minimum version errors.
+type MinimumVersionError struct {
+	inputVersion int
+}
+
+func (e *MinimumVersionError) Error() string {
+	return fmt.Errorf("input schema version is below minimum version. input: %d minimum: %d", e.inputVersion, MINIUM_VERSION).Error()
+}
+
+// ErrMigrationFailed is an error that is returned when a migration fails.
+func NewMigrationError(msg string, currentVersion, targetVersion int) *MigrationError {
+	return &MigrationError{
+		msg:            msg,
+		targetVersion:  targetVersion,
+		currentVersion: currentVersion,
+	}
+}
+
+// MigrationError is an error type for migration errors.
+type MigrationError struct {
+	msg            string
+	targetVersion  int
+	currentVersion int
+}
+
+func (e *MigrationError) Error() string {
+	return fmt.Errorf("schema migration from version %d to %d failed: %v", e.currentVersion, e.targetVersion, e.msg).Error()
+}