Move handler objects to common location to share with RMO

http/error_with_status.go

@@ -0,0 +1,32 @@
+package http
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type ErrorWithStatus struct {
+	Message string
+	Status  int
+}
+
+func (e *ErrorWithStatus) Error() string {
+	return e.Message
+}
+func NewError(mesg_format string, args ...any) *ErrorWithStatus {
+	return NewErrorStatus(http.StatusInternalServerError, mesg_format, args...)
+}
+func NewErrorMaybe(mesg_format string, err error, args ...any) *ErrorWithStatus {
+	if err == nil {
+		return nil
+	}
+	allArgs := append([]any{err}, args...)
+	return NewErrorStatus(http.StatusInternalServerError, mesg_format, allArgs...)
+}
+func NewErrorStatus(status int, mesg_format string, args ...any) *ErrorWithStatus {
+	w := fmt.Errorf(mesg_format, args...)
+	return &ErrorWithStatus{
+		Message: w.Error(),
+		Status:  status,
+	}
+}