switch hto monorepo structure

backend/pkg/ipp/error.go

@@ -0,0 +1,31 @@
+package ipp
+
+import "fmt"
+
+// IsNotExistsError checks a given error whether a printer or class does not exist
+func IsNotExistsError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	return err.Error() == "The printer or class does not exist."
+}
+
+// IPPError used for non ok ipp status codes
+type IPPError struct {
+	Status  int16
+	Message string
+}
+
+func (e IPPError) Error() string {
+	return fmt.Sprintf("ipp status: %d, message: %s", e.Status, e.Message)
+}
+
+// HTTPError used for non 200 http codes
+type HTTPError struct {
+	Code int
+}
+
+func (e HTTPError) Error() string {
+	return fmt.Sprintf("got http code %d", e.Code)
+}