docs: add DEVELOPER.md (architecture, build, debug, packaging)
Developer-facing manual covering: 1. Architecture overview with the four-layer data flow diagram 2. Repository layout (src/, snapshot/, storage/, etc.) 3. Dev environment setup (one-time + daily) and the 'what to restart after what type of change' table 4. Common commands quick reference 5. Debugging: backend (server logs, curl), frontend (browser DevTools, console.log diagnostic points, React/Lumino inspection), and end-to-end symptom -> cause table 6. Packaging and release (PyPI wheel via hatch + jupyter-builder, version sourced from package.json, git tag flow, CI) 7. Known pitfalls: jest+pnpm linker incompatibility, S3 strong consistency variance, conda/npm gotchas 8. 5-minute quickstart for new contributors User-facing concerns (install/config/troubleshoot) stay in README.md; design goals stay in design.md; AI coding rules stay in AGENTS.md. DEVELOPER.md slots in for engineer handoff / onboarding. Co-Authored-By: Claude <noreply@anthropic.com>
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# Developer Manual
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开发笔记本快照扩展的工程手册。面向**接手开发**的人:架构、构建、调试、打包全流程。
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> 用户视角(安装 / 配置 / 排错)见 [README.md](README.md)。设计目标见 [design.md](design.md)。AI 编码规范见 [AGENTS.md](AGENTS.md)。
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## 1. 架构概览
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四层结构,数据自下而上:
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```
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┌──────────────────────────────────────────────────────────────┐
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│ JupyterLab 前端 (src/) │
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│ ├─ commands / api / model / diff / widgets │
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│ └─ 与后端走 HTTP (POST commit / GET list / GET content) │
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└──────────────────┬───────────────────────────────────────────┘
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│ JSON over HTTP
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┌──────────────────┴───────────────────────────────────────────┐
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│ Server Extension (snapshot/) │
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│ ├─ routes.py REST handlers │
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│ ├─ store.py SnapshotStore(清洗 + hash + envelope + │
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│ │ manifest 原子写 + 重建) │
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│ ├─ config.py traitlets 配置 │
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│ └─ __init__.py _load_jupyter_server_extension 入口 │
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└──────────────────┬───────────────────────────────────────────┘
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│
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┌──────────────────┴───────────────────────────────────────────┐
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│ Storage Adapter (snapshot/storage/) │
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│ ├─ base.py StorageAdapter ABC(put/get/list/delete) │
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│ ├─ local.py LocalFileStorage(原子写 tmp+rename) │
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│ └─ s3.py S3Storage(boto3,懒加载) │
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└──────────────────────────────────────────────────────────────┘
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```
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**关键设计决策**(实现时不得违背,见 [AGENTS.md](AGENTS.md)):
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1. 存储适配器是**哑字节桶**——不知道 notebook / 版本 / manifest 这些概念
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2. MD5 在清洗后 JSON 上计算;hash 与最近版本相同则跳过保存
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3. 快照文件是 **envelope**(`{id, timestamp, name, description, hash, size, notebook}`),name/description 内嵌以便 manifest 损坏时从版本文件重建
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4. manifest 是可重建的索引,原真相在 envelope 里
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5. 手动提交,不绑定 Ctrl+S,**不**自动 commit
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6. Cell diff 按 id 优先匹配,LCS 兜底
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## 2. 仓库布局
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```
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.
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├── src/ 前端 TypeScript / React
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│ ├── index.ts 插件入口(注册命令、挂面板、装工具栏)
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│ ├── commands.ts 命令实现(snapshot:commit / restore)
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│ ├── api.ts 类型化 HTTP 包装
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│ ├── model.ts SnapshotModel(path + versions + 信号)
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│ ├── diff.ts Cell 级 diff(id 优先 + LCS 兜底)
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│ ├── request.ts requestAPI(带 /snapshot 前缀)
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│ └── widgets/ ReactWidget 组件
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│ ├── CommitDialog.ts 名称/描述输入
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│ ├── SnapshotPanel.tsx 左侧栏时间轴
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│ └── DiffWidget.tsx 主区 diff 视图
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├── snapshot/ 后端 Python
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│ ├── __init__.py _load_jupyter_server_extension
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│ ├── routes.py 三个 REST 处理器
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│ ├── store.py SnapshotStore(核心业务)
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│ ├── config.py traitlets 配置
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│ ├── storage/ 存储适配器
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│ │ ├── base.py ABC
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│ │ ├── local.py
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│ │ └── s3.py
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│ └── tests/ pytest
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├── style/ CSS(base.css 命名空间 jp-snapshot-*)
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├── schema/plugin.json 前端 settings schema(目前空)
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├── ui-tests/ Playwright + Galata 集成测试
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├── design.md 架构设计文档(单一事实源)
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├── AGENTS.md / CLAUDE.md AI 编码规范(CLAUDE.md 是符号链接)
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├── README.md 用户文档
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└── DEVELOPER.md 本文件
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```
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## 3. 开发环境搭建
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一次性:
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```bash
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# 后端
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python3 -m venv .venv
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source .venv/bin/activate
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pip install -e ".[dev,test,s3]"
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# 前端
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.venv/bin/jlpm install
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# 注册扩展到 JupyterLab
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jupyter server extension enable snapshot
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jupyter labextension develop . --overwrite
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```
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每日:
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```bash
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source .venv/bin/activate
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.venv/bin/jlpm watch # 终端 1:自动重编
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jupyter lab # 终端 2:启动 JupyterLab
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```
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**改了 Python**:重启 `jupyter lab`(不需要 rebuild 前端)
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**改了 TypeScript**:`jlpm watch` 自动重编 → 浏览器**硬刷新**(Cmd+Shift+R)拿新 bundle
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**改了 CSS**:`jlpm watch` 不会自动 rebuild——手动 `jlpm build` 后刷新
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## 4. 常用命令
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| 操作 | 命令 |
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|------|------|
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| 后端测试 | `.venv/bin/pytest snapshot/tests/ -vv` |
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| 后端单测 | `.venv/bin/pytest snapshot/tests/test_store.py::test_xxx -vv` |
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| 前端构建 | `.venv/bin/jlpm build` |
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| 前端打包 | `.venv/bin/jlpm build:prod` |
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| Lint | `.venv/bin/jlpm lint:check` |
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| 看日志 | 启动 jupyter lab 的那个终端 |
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| 跑 ui-tests | `cd ui-tests && yarn install && yarn test` |
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| 清理 | `.venv/bin/jlpm clean:all` |
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## 5. 调试
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### 5.1 后端(Python)
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`jupyter lab` 的终端会打印所有 server extension 的日志,包括本扩展。
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**结构化日志**(在 `_load_jupyter_server_extension` 里):
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```python
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server_app.log.info(f"Activated snapshot storage backend: {config.storage_type}")
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# S3 模式还会打:
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# server_app.log.info(f"Snapshot S3 storage ready: endpoint=..., bucket=...")
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```
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**S3 连接失败**:会抛 `S3ConnectionError`(带 endpoint / bucket / 修复建议),JupyterLab 启动失败。看 traceback。
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**手动看 API**(不通过前端):
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```bash
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# 启动后
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.venv/bin/jupyter server --port 8888 &
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# 拿到 token from jupyter_server 的输出
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TOK=...
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# 提交
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curl -X POST -H "Authorization: token $TOK" -H "Content-Type: application/json" \
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-d '{"path":"test.ipynb","content":{"cells":[],"metadata":{},"nbformat":4,"nbformat_minor":5},"name":"v1","description":""}' \
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http://localhost:8888/snapshot/notebook-version/commit
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# 列表
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curl -H "Authorization: token $TOK" \
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"http://localhost:8888/snapshot/notebook-version/list?path=test.ipynb"
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```
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### 5.2 前端(TypeScript / React)
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**1. 浏览器 DevTools Console**
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打开 DevTools (F12 或 Cmd+Option+I) → Console。
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代码里有 `console.log` 诊断日志:
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- `'JupyterLab extension snapshot is activated!'` — 插件加载
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- `'snapshot settings loaded:'` — settings 加载
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- `'[snapshot] commit response:'` — commit 响应(最近调试加的)
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- `'Failed to list snapshots'` — list 失败
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- `'Diff failed'` — diff 失败
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**2. 看 React 组件树**:装 React DevTools 扩展
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**3. 看 Lumino Widget 树**:在 Console 跑 `JupyterLab.shell.widgets()` 看主区 widget,左区 widget 列表
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**4. 改前端后必须硬刷新**:JupyterLab 缓存 labextension,**软刷新可能拿到旧 bundle**。Cmd+Shift+R 清缓存。
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### 5.3 端到端问题排查
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| 症状 | 排查 |
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|------|------|
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| 工具栏没「保存快照」按钮 | (1) 硬刷新浏览器;(2) `jupyter labextension list` 看 snapshot 状态 |
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| 提交没反应 | 看 Console 有无 `[snapshot] commit response:` 日志,看 jupyter 终端有无 traceback |
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| 「内容未变更」warning 不弹 | Console 里看 commit response 实际是什么 |
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| 保存后历史列表没新条目 | 点侧边栏「刷新」按钮(手动 list);检查 S3 manifest 写入(用 `aws s3 ls` 或 MinIO 控制台) |
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| Diff 视图空白 | 检查 `model.versions` 是否有目标 id;后端 `/content?path=&id=` 单独 curl 一次 |
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| Restore 失败 | Console 报具体错;检查 `notebook.model.fromJSON` 的入参结构 |
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### 5.4 测试覆盖现状
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```
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backend pytest: 33 passed (13 storage + 9 store + 6 routes_api + 5 misc)
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frontend jest: ❌ pnpm 链接器下跑不起来(见下方"已知坑")
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ui-tests: 跑通需先 `cd ui-tests && yarn install`,未在 CI 中
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```
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**新增后端测试**:`snapshot/tests/test_*.py`,命名 `test_<模块>_<场景>`.py
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**新增前端测试**:jest 暂时不可用。如需单测 `src/diff.ts` 的纯逻辑,可:
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- 临时方案:把 diff 函数复制到 `__tests__/diff.spec.ts` 跑(在已知坑解决前)
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- 正确方案:改 `.yarnrc.yml` 的 `nodeLinker` 为 `node-modules`,再重装
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## 6. 打包与发布
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### 6.1 版本管理
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- **单一事实源**:`package.json` 的 `version` 字段
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- `pyproject.toml` 通过 `hatch-nodejs-version` 自动从 `package.json` 同步
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- 手动修改 `pyproject.toml` 的版本会被覆盖
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### 6.2 后端 wheel
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```bash
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.venv/bin/pip install build hatch hatch-jupyter-builder hatch-nodejs-version
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.venv/bin/python -m build
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# 产物:dist/snapshot-0.1.0-py3-none-any.whl + dist/snapshot-0.1.0.tar.gz
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```
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`pyproject.toml` 的 `[tool.hatch.build.hooks.jupyter-builder]` 会自动 build 前端并打进 wheel 的 `snapshot/labextension/`。
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发布到 PyPI:
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```bash
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.venv/bin/python -m twine upload dist/*
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```
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### 6.3 前端 labextension
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前端**不单独发布**。build 产物(`snapshot/labextension/`)通过 hatch hook 嵌进 wheel。
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本地 dev 模式:`jupyter labextension develop . --overwrite` 建立符号链接,改前端代码即时生效。
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### 6.4 发布 checklist
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1. 改 `package.json` 的 version(不要改 `pyproject.toml`)
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2. 更新 `CHANGELOG.md`
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3. `git tag v0.1.0`
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4. 跑全套验证:`pytest` + `jlpm build:prod` + `jlpm lint:check`
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5. `python -m build` 出 wheel
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6. (可选) `twine upload dist/*` 发 PyPI
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7. `git push --tags`
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CI 流程见 `.github/workflows/build.yml` 和 `publish-release.yml`。
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## 7. 已知坑
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### 7.1 Jest 在 pnpm 链接器下跑不起来
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`jlpm test` 报 `Cannot find module 'jest-util'`,stack 指向 `ts-jest/dist/legacy/config/config-set.js`。
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**根因**:`yarnLinker: pnpm`(`.yarnrc.yml`)的虚拟存储把 `ts-jest` 和 `jest-util` 隔开,pnpm 严格隔离破坏了 require 路径。
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**绕过**:
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- 暂时不修——前端用 `jlpm build`(tsc 严格模式 + rspack bundle)验证类型和模块等价
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- 真要跑单测,改 `.yarnrc.yml` 切 `nodeLinker: node-modules`(影响整个 monorepo 解析)
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- 或完全重写 `jest.config.js` 不依赖 `@jupyterlab/testing` 的 baseConfig
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### 7.2 S3 强一致性
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AWS S3 自 2020 年起强一致(读写单对象强一致)。**但 MinIO / Ceph RGW / 阿里云 OSS 等 S3 兼容服务实现各异**。
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表现:commit 写入 manifest 成功,但紧随其后的 list 偶尔返回旧 manifest。
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**临时缓解**:侧边栏有「刷新」按钮,用户手动拉一次。
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**彻底修复**(未做):commit 响应里直接返回最新 list,省掉独立 list 调用。
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### 7.3 `.yarnrc.yml` / `.venv` / lockfile
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- 仓库用 **uv/venv**(不是 conda):`source .venv/bin/activate`
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- 前端用 **Yarn Berry**(不是 npm / yarn classic):`jlpm`,不要 `npm install`
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- 不要混 `package-lock.json` 和 `yarn.lock`
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## 8. 给新 contributor 的 5 分钟清单
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1. `source .venv/bin/activate && pip install -e ".[dev,test,s3]"`
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2. `.venv/bin/jlpm install && .venv/bin/jlpm build`
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3. `jupyter server extension enable snapshot && jupyter labextension develop . --overwrite`
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4. `jupyter lab` → 打开任意 `.ipynb` → 看工具栏「保存快照」按钮
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5. 点按钮 → 填 name → 看左侧栏时间轴;改 cell 再保存 → 时间轴更新
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如果第 4 步没看到按钮:**硬刷新**浏览器(Cmd+Shift+R)。
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Reference in New Issue
Block a user