helper/resource: Implement resource-wide NotFoundError

helper/resource/error.go

@@ -0,0 +1,21 @@
+package resource
+
+type NotFoundError struct {
+	LastError    error
+	LastRequest  interface{}
+	LastResponse interface{}
+	Message      string
+	Retries      int
+}
+
+func (e *NotFoundError) Error() string {
+	if e.Message != "" {
+		return e.Message
+	}
+
+	return "couldn't find resource"
+}
+
+func NewNotFoundError(err string) *NotFoundError {
+	return &NotFoundError{Message: err}
+}