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Deepcopy incorrectly sets the 'active' oneof field to last field in structure (breaking which_one_of)

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
45/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
停滞
技术栈
python

调研方向

从 issue 中显示的 deepcopy 实现入手,检查 oneof_field_by_group 如何表示活动字段。使用包含两个 one_of 字段的 proto 重现此情况,然后验证 deepcopy 保留复制前选中的字段,并且 which_one_of 之后返回相同的字段。

由索引模型根据 Issue 内容生成。

描述

bug
Summary

When calling deepcopy on a proto, the oneOf field state gets overwritten.

Reproduction Steps
  1. Create a simple proto with two one_of fields.
  2. set the first field
  3. Call which_one_of which will return the first field
  4. Call deepcopy on the proto
  5. check which_one_of again.
  6. The second field is returned.

The implementation of deepcopy does this:

        for name in self._betterproto.sorted_field_names:
            value = self.__raw_get(name)
            if value is not PLACEHOLDER:
                kwargs[name] = deepcopy(value)

And of course, setattr sets the current group by field, which overwrites this.

one option is to simply make deepcopy one_of aware, using oneof_field_by_group, default initializing the nonset fields and adding them to a set, and then only iterating over the names that aren't in the set using the overall loop above.

Expected Results

We preserve the correct one_of field

Actual Results

The second one_of field is set.

System Information

libprotoc 3.21.12
Python 3.11.9
Name: betterproto
Version: 2.0.0b6
Summary: A better Protobuf / gRPC generator & library
Home-page: https://github.com/danielgtaylor/python-betterproto
Author: Daniel G. Taylor
Author-email: [email protected]
License: MIT
Location: /usr/local/lib/python3.11/site-packages
Requires: grpclib, python-dateutil
Required-by:

Checklist
  • I have searched the issues for duplicates.
  • I have shown the entire traceback, if possible.
  • I have verified this issue occurs on the latest prelease of betterproto which can be installed using pip install -U --pre betterproto, if possible.
主要语言
Python
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PR 合并指标
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环境准备

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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