docs: workflow graph visualization design plan (#198)
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# Dashboard Workflow Graph Visualization
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**Issue**: #198
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**Status**: Draft
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**Author**: xingyue
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## Overview
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在 Dashboard 的 ThreadDetail 页面中嵌入一个交互式流程图,将 workflow 的 `ModeratorTable` 可视化为有向图。用户可以一眼看到角色流转结构和当前执行进度。
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## 数据流
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### 问题:ModeratorTable 在 bundle 端,Dashboard 在前端
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`ModeratorTable` 是运行时数据结构(包含 JS 函数引用如 `check`),无法直接序列化给前端。需要一个**静态图描述格式**作为中间层。
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### 方案:扩展 WorkflowDescriptor
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当前 `WorkflowDescriptor` 只有 roles + description,不包含转换图信息:
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```ts
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type WorkflowDescriptor = {
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description: string;
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roles: Record<string, WorkflowRoleDescriptor>;
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};
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```
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**扩展为**:
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```ts
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type TransitionEdge = {
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condition: string; // condition.name,或 "FALLBACK"
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description: string | null; // condition.description,FALLBACK 为 null
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target: string; // role name 或 "__end__"
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};
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type WorkflowGraph = Record<string, TransitionEdge[]>;
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// key = source role name 或 "__start__"
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type WorkflowDescriptor = {
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description: string;
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roles: Record<string, WorkflowRoleDescriptor>;
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graph: WorkflowGraph | null; // null = legacy bundles without graph
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};
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```
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在 `buildDescriptor`(`workflow-register`)中,从 `ModeratorTable` 提取静态图结构。`condition.check` 函数不序列化,只保留 `name` 和 `description`。
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### 数据暴露路径
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```
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ModeratorTable (runtime)
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→ buildDescriptor() 提取 graph
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→ descriptor.yaml 持久化
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→ CLI serve /workflows API 返回
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→ Dashboard 前端拿到 graph
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```
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同时需要新增或扩展一个 API,让 Dashboard 能拿到指定 workflow 的 descriptor(含 graph):
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```
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GET /workflows/:name → { descriptor: WorkflowDescriptor }
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```
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或者在现有 `listWorkflows` 返回中附带。
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## 前端渲染
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### 库选型:React Flow + dagre
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| 库 | 优势 | 劣势 |
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|---|---|---|
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| **React Flow** ✅ | React 原生、自定义节点/边、dagre 自动布局、~50KB gzip | 需要学 API |
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| Mermaid | 声明式简单 | 无交互、无法高亮当前步骤 |
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| D3 | 完全控制 | 太底层,手撸成本高 |
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| Cytoscape | 图论强 | React 集成差 |
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**依赖新增**:
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```json
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{
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"@xyflow/react": "^12",
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"@dagrejs/dagre": "^1"
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}
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```
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### 图结构映射
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```
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WorkflowGraph → React Flow nodes + edges
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节点:
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- __start__ → 圆形小节点(入口)
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- role → 圆角矩形,显示 role name + description
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- __end__ → 圆形小节点(终止)
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边:
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- FALLBACK → 虚线(dashed),无 label
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- condition → 实线,label = condition.name
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hover tooltip = condition.description
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```
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### 布局
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使用 dagre 自动计算 TB(top-to-bottom)方向布局:
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```ts
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import Dagre from "@dagrejs/dagre";
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function layoutGraph(nodes, edges) {
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const g = new Dagre.graphlib.Graph().setDefaultEdgeLabel(() => ({}));
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g.setGraph({ rankdir: "TB", nodesep: 60, ranksep: 80 });
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for (const node of nodes) {
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g.setNode(node.id, { width: 180, height: 60 });
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}
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for (const edge of edges) {
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g.setEdge(edge.source, edge.target);
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}
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Dagre.layout(g);
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return nodes.map((node) => {
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const pos = g.node(node.id);
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return { ...node, position: { x: pos.x - 90, y: pos.y - 30 } };
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});
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}
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```
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### 运行时高亮
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ThreadDetail 已有 `records: ThreadRecord[]`,其中 `RoleRecord.role` 就是当前/历史执行的 role。
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高亮逻辑:
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```ts
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function getNodeStates(records: ThreadRecord[]): Map<string, "completed" | "active"> {
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const states = new Map<string, "completed" | "active">();
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const roleRecords = records.filter((r) => r.type === "role");
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for (let i = 0; i < roleRecords.length; i++) {
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const role = roleRecords[i].role;
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states.set(role, i === roleRecords.length - 1 ? "active" : "completed");
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}
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// 如果有 workflow-result,最后一个 role 也是 completed
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if (records.some((r) => r.type === "workflow-result")) {
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for (const [k] of states) {
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states.set(k, "completed");
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}
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states.set("__end__", "completed");
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}
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states.set("__start__", "completed");
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return states;
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}
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```
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节点样式:
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| 状态 | 样式 |
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|------|------|
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| default | `border: var(--color-border)`, 暗色背景 |
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| completed | `border: var(--color-success)`, 绿色边框 + ✓ 图标 |
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| active | `border: var(--color-accent)`, 蓝色边框 + 脉冲动画 |
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边高亮:当 source 和 target 都至少 completed 时,边变绿。
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## 组件结构
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```
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workflow-dashboard/src/
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components/
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workflow-graph/
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types.ts — TransitionEdge, NodeState 等前端类型
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index.ts — export { WorkflowGraph }
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workflow-graph.tsx — 主组件,React Flow canvas
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role-node.tsx — 自定义 role 节点
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terminal-node.tsx — START/END 圆形节点
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condition-edge.tsx — 自定义边(虚线/实线 + label)
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use-layout.ts — dagre 布局 hook
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```
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### 集成到 ThreadDetail
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在 ThreadDetail 中,records 列表上方插入可折叠的图面板:
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```tsx
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// thread-detail.tsx
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{graph && (
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<div className="mb-4 border rounded-lg overflow-hidden" style={{ height: 300 }}>
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<WorkflowGraph graph={graph} nodeStates={getNodeStates(records)} />
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</div>
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)}
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```
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图高度固定 300px,React Flow 支持 pan + zoom,不影响下方 records 滚动。
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## 分阶段实施
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### Phase 1: 数据层 + 静态图
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1. 在 `workflow-protocol` 中新增 `TransitionEdge` / `WorkflowGraph` 类型
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2. 在 `workflow-register` 的 `buildDescriptor` 中从 `ModeratorTable` 提取 graph
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3. `stringifyWorkflowDescriptor` / `validateWorkflowDescriptor` 支持 graph 字段
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4. CLI serve 的 `/workflows` API 返回 descriptor(含 graph)
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5. Dashboard 新增 `WorkflowGraph` 组件,静态渲染图
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**产出**:打开 ThreadDetail 看到 workflow 流程图,无高亮。
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### Phase 2: 运行时高亮
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1. ThreadDetail 根据 records 计算 nodeStates
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2. 节点/边样式响应状态变化
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3. SSE live 模式下实时更新高亮
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**产出**:正在运行的 thread 能看到当前执行到哪个 role。
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### Phase 3: 交互增强
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1. 点击节点滚动到对应 role 的 RecordCard
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2. 边 hover 显示 condition description tooltip
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3. 节点 hover 显示 role description + schema summary
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**产出**:图和记录列表联动。
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## 注意事项
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- **向后兼容**:`graph` 字段为 `null` 时(旧 bundle),不渲染图,只显示 records
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- **自循环边**:如 `coder → coder (FALLBACK)`,React Flow 支持自循环,dagre 需要特殊处理(self-edge 用 loop 路径)
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- **大图性能**:dagre 在 <50 节点时性能无忧,workflow 通常 <10 个 role
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- **暗色主题**:Dashboard 已使用 CSS variables,节点/边样式复用现有色板
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- **不提交 pnpm-lock.yaml**
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## 开放问题
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1. **graph 放 descriptor 还是独立字段?** — 建议放 descriptor,因为它描述的就是 workflow 结构
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2. **是否需要 WorkflowList 页也展示图?** — Phase 1 先只在 ThreadDetail,后续按需扩展
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3. **`buildDescriptor` 需要 `ModeratorTable` 参数** — 当前 `buildDescriptor` 只接收 roles,需要扩展签名或在 bundle 注册时额外传入 table
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