docs: 更新 Agent 协议文档与部署配置
- 更新 Agent API 端点文档 - 更新 SSE 事件与输入输出文档 - 新增 deploy/.env.prod.example 配置模板
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# 前后端数据流通指南
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# 前后端数据流通指南(Agent Chat)
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本文档描述前端如何与后端 Agent 系统交互,以及如何渲染后端返回的 UI 数据。
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本文档仅描述**当前后端实现**的 runs/events/history 数据流,不定义视觉细节。
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---
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## 1. 整体交互流程
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## 1) 总体流程
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```
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┌─────────────────────────────────────────────────────────────────────────┐
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│ 前端 │
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├─────────────────────────────────────────────────────────────────────────┤
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│ │
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│ ┌──────────────┐ POST /runs ┌──────────────┐ │
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│ │ 构造请求 │ ──────────────────▶│ 后端 │ │
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│ │ (多模态数据) │ │ (任务入队) │ │
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│ └──────────────┘◀────────────────── └──────────────┘ 202 Accepted │
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│ │ taskId │
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│ │ │
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│ │ GET /runs/{threadId}/events │
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│ │──────────────────────────────────────────────────────────▶ │
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│ │ SSE 事件流 ◀───────────────── │
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│ │ │
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│ ┌─────┴──────────────────────────────────────────────────────────┐ │
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│ │ 渲染事件 │ │
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│ │ - text.delta: 追加文本 │ │
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│ │ - tool.result: 渲染 toolAgentOutput.ui_hints → UiSchema │ │
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│ │ - text.end: 渲染 workerAgentOutput.ui_hints → UiSchema │ │
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│ └────────────────────────────────────────────────────────────────┘ │
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│ │
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└─────────────────────────────────────────────────────────────────────────┘
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┌─────────────────────────────────────────────────────────────────────────┐
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│ 后端 │
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├─────────────────────────────────────────────────────────────────────────┤
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│ │
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│ POST /runs │
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│ → 验证请求 │
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│ → 任务入队列 (Taskiq) │
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│ │
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│ Worker 执行 │
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│ → emit 事件到 Redis Stream │
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│ → UiHints → ui_compiler.compile() → UiSchemaRenderer │
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│ │
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│ 持久化 │
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│ → AgentChatMessage (含 uiSchema) │
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│ │
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└─────────────────────────────────────────────────────────────────────────┘
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```
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1. 客户端 `POST /api/v1/agent/runs` 提交 `RunAgentInput`
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2. 后端返回 `202` + `taskId/threadId/runId/created`
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3. 客户端 `GET /api/v1/agent/runs/{threadId}/events` 订阅 SSE
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4. 后端输出 AG-UI 事件(如 `RUN_STARTED`、`TOOL_CALL_RESULT`、`TEXT_MESSAGE_END`)
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5. 客户端按需 `GET /api/v1/agent/history` 拉取历史快照(按天)
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---
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## 2. 多模态数据处理
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## 2) `/runs` 请求与响应
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### 2.1 前端上传附件流程
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### 请求
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```javascript
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// 方式一:先上传附件,获取签名 URL
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const formData = new FormData();
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formData.append('threadId', threadId);
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formData.append('file', imageFile);
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- Body: `RunAgentInput`
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- user message 可为纯文本,也可为文本+binary(图片 URL)
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const uploadResponse = await fetch('/api/v1/agent/attachments', {
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method: 'POST',
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body: formData,
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});
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const { attachment } = await uploadResponse.json();
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// attachment.url 是临时访问 URL
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### 响应
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// 方式二:直接使用已有的签名 URL(如果有)
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const imageUrl = 'https://storage.example.com/...';
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```json
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{
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"taskId": "...",
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"threadId": "...",
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"runId": "...",
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"created": true
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}
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```
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### 2.2 构造 RunAgentInput
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```javascript
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const runInput = {
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threadId: threadId,
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runId: `run-${Date.now()}`,
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state: {},
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messages: [
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{
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id: `msg-${Date.now()}`,
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role: 'user',
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content: [
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{ type: 'text', text: '这张图片里有什么?' },
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{
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type: 'binary',
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mimeType: 'image/png',
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url: attachment.url // 签名 URL
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}
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]
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}
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],
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tools: [], // 或传入工具定义
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context: [],
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forwardedProps: {}
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};
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```
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### 2.3 发送请求
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```javascript
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const response = await fetch('/api/v1/agent/runs', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify(runInput)
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});
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// 返回 202 Accepted
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const { taskId, threadId, runId, created } = await response.json();
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```
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`created` 语义:是否在本次请求中创建了新会话。
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---
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## 3. 事件流渲染
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## 3) `/runs/{threadId}/events` 事件流
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### 3.1 订阅事件
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### SSE 形式
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```javascript
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class AgentEventHandler {
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constructor(threadId) {
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this.eventSource = new EventSource(`/api/v1/agent/runs/${threadId}/events`);
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this.setupListeners();
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}
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```text
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id: <stream-id>
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event: <EVENT_TYPE>
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data: <json>
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setupListeners() {
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this.eventSource.addEventListener('run.started', this.onRunStarted);
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this.eventSource.addEventListener('step.start', this.onStepStart);
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this.eventSource.addEventListener('text.delta', this.onTextDelta);
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this.eventSource.addEventListener('text.message.start', this.onTextStart);
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this.eventSource.addEventListener('tool.call.start', this.onToolStart);
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this.eventSource.addEventListener('tool.call.args', this.onToolArgs);
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this.eventSource.addEventListener('tool.call.result', this.onToolResult);
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this.eventSource.addEventListener('text.message.end', this.onTextEnd);
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this.eventSource.addEventListener('run.finished', this.onRunFinished);
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this.eventSource.addEventListener('run.error', this.onRunError);
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}
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}
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```
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### 3.2 事件处理与渲染
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### 事件类型
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#### text.delta - 文本增量
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以 `docs/protocols/agent/sse-events.md` 为准。当前重点是:
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```javascript
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onTextDelta(event) {
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const data = JSON.parse(event.data);
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const { delta, messageId } = data.data;
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// 追加到对应消息的文本内容
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appendTextToMessage(messageId, delta);
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}
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```
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- 运行生命周期:`RUN_STARTED` / `RUN_FINISHED` / `RUN_ERROR`
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- 阶段:`STEP_STARTED` / `STEP_FINISHED`
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- 工具:`TOOL_CALL_START` / `TOOL_CALL_ARGS` / `TOOL_CALL_END` / `TOOL_CALL_RESULT`
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- 文本完成:`TEXT_MESSAGE_END`
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#### tool.result - 工具结果
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### 文本流策略
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```javascript
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onToolResult(event) {
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const data = JSON.parse(event.data);
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const { toolAgentOutput, toolCallId } = data.data;
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if (toolAgentOutput?.ui_hints) {
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// 后端返回的是 UiHints,需要编译为 UiSchemaRenderer
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const uiSchema = compileUiHints(toolAgentOutput.ui_hints);
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renderUiSchema(uiSchema, toolCallId);
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} else {
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// 纯文本结果
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renderText(toolAgentOutput.result_summary, toolCallId);
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}
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}
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```
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#### text.end - Worker 完成
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```javascript
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onTextEnd(event) {
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const data = JSON.parse(event.data);
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const { workerAgentOutput, inputTokens, outputTokens, cost } = data.data;
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if (workerAgentOutput?.ui_hints) {
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// 渲染 UiHints → UiSchemaRenderer
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const uiSchema = compileUiHints(workerAgentOutput.ui_hints);
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renderUiSchema(uiSchema, messageId);
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} else {
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// 纯文本回复
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renderText(workerAgentOutput?.answer, messageId);
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}
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// 显示使用统计
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showUsageStats({ inputTokens, outputTokens, cost });
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}
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```
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当前后端不提供 token 级 `TEXT_MESSAGE_CONTENT` 增量流作为主路径;
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而是在 worker 完成后通过 `TEXT_MESSAGE_END` 一次性携带完整语义结果。
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---
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## 4. History 对话历史渲染
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## 4) `/history` 快照
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### 4.1 获取历史
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`GET /api/v1/agent/history` 返回 `HistorySnapshotResponse`:
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```javascript
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const response = await fetch(
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`/api/v1/agent/history?threadId=${threadId}&before=${date}`
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);
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const { messages } = await response.json();
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```json
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{
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"scope": "history_day",
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"threadId": "...",
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"day": "2026-03-16",
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"hasMore": false,
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"messages": []
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}
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```
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### 4.2 渲染历史消息
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说明:
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```javascript
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messages.forEach(msg => {
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switch (msg.role) {
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case 'user':
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renderUserMessage(msg);
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break;
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case 'assistant':
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if (msg.uiSchema) {
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// 直接渲染 UiSchemaRenderer(后端已编译好)
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renderUiSchema(msg.uiSchema);
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} else {
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// 纯文本
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renderText(msg.content);
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}
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break;
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case 'tool':
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// tool 结果也可能有 uiSchema
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if (msg.uiSchema) {
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renderUiSchema(msg.uiSchema);
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} else {
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renderText(msg.content);
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}
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break;
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}
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});
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```
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- 这是普通 JSON 响应,不是 SSE 事件包装。
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- `messages` 已按 seq 升序组织。
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- `before` 采用 `YYYY-MM-DD`,语义是向更早日期翻页。
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---
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## 5. UiSchemaRenderer 渲染
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## 5) events 与 history 的一致性机制
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### 5.1 数据结构
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### 5.1 语义来源一致
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后端 `ui_compiler.compile()` 输出的结构:
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两条链路都来自同一运行时输出(worker/tool output)及其持久化元数据。
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```typescript
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interface UiSchemaRenderer {
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version: "2.0";
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locale: string;
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status: "info" | "success" | "warning" | "error" | "pending";
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theme: "default" | "light" | "dark";
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meta?: {
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requestId?: string;
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toolId?: string;
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traceId?: string;
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userId?: string;
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};
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root: UiLayoutNode;
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}
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### 5.2 UI 编译器一致
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// 布局节点
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interface UiStackNode {
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type: "stack";
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direction: "vertical" | "horizontal";
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gap?: number;
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appearance: "plain" | "card" | "section";
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status?: UiStatus;
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align?: LayoutAlign;
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justify?: LayoutJustify;
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wrap?: boolean;
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children: UiNode[];
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}
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两条链路都使用后端 `ui_compiler.compile(...)` 将 `ui_hints` 编译为可渲染结构:
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interface UiGridNode {
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type: "grid";
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columns: number;
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gap?: number;
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appearance: LayoutAppearance;
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status?: UiStatus;
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children: UiNode[];
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}
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- events:在 runtime 发送事件前编译,字段名为 `ui_schema`
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- history:在历史转换时编译,字段名为 `ui_schema`
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// 基础节点
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type UiNode =
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| UiTextNode // 文本
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| UiIconNode // 图标
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| UiBadgeNode // 标签
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| UiButtonNode // 按钮
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| UiKvNode // 键值对
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| UiDividerNode; // 分割线
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### 5.3 当前命名差异(实现现状)
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// 文本节点
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interface UiTextNode {
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type: "text";
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content: string;
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format: "plain" | "markdown";
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role: "title" | "subtitle" | "body" | "caption" | "code";
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status?: UiStatus;
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maxLines?: number;
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visible?: boolean;
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}
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两条链路字段命名已统一:
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// 按钮节点
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interface UiButtonNode {
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type: "button";
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label: string;
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style: "primary" | "secondary" | "ghost" | "danger";
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disabled?: boolean;
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icon?: UiIconSpec;
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action: UiActionPayload;
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}
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// 键值对节点
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interface UiKvNode {
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type: "kv";
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items: UiKvItem[];
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columns?: number;
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}
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interface UiKvItem {
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key: string;
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label?: string;
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value: any;
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copyable?: boolean;
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}
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// Action payloads
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type UiActionPayload =
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| { type: "navigation"; path: string; params?: Record<string, any> }
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| { type: "url"; url: string; target?: "_self" | "_blank" }
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| { type: "event"; event: string; payload?: Record<string, any> }
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| { type: "tool"; toolId: string; params?: Record<string, any> }
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| { type: "copy"; content: string; successMessage?: string }
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| { type: "payload"; payload: Record<string, any>; submitTo?: string };
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```
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### 5.2 统一渲染器实现
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```dart
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class UiSchemaRendererWidget extends StatelessWidget {
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final UiSchemaRenderer schema;
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@override
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Widget build(BuildContext context) {
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return renderNode(schema.root);
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}
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Widget renderNode(UiNode node) {
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switch (node.type) {
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case 'text':
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return renderTextNode(node as UiTextNode);
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case 'icon':
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return renderIconNode(node as UiIconNode);
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case 'badge':
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return renderBadgeNode(node as UiBadgeNode);
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case 'button':
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return renderButtonNode(node as UiButtonNode);
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case 'kv':
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return renderKvNode(node as UiKvNode);
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case 'divider':
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return renderDividerNode(node as UiDividerNode);
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case 'stack':
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return renderStackNode(node as UiStackNode);
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case 'grid':
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return renderGridNode(node as UiGridNode);
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default:
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return SizedBox.shrink();
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}
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}
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}
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```
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### 5.3 事件渲染 vs History 渲染一致性
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**关键点**:两者使用同一个渲染器
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| 数据来源 | 数据格式 | 处理方式 |
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|---------|---------|---------|
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| events text.end | `workerAgentOutput.ui_hints` | compile → UiSchemaRenderer → 渲染 |
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| events tool.result | `toolAgentOutput.ui_hints` | compile → UiSchemaRenderer → 渲染 |
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| history assistant | `msg.uiSchema` | 直接渲染 |
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| history tool | `msg.uiSchema` | 直接渲染 |
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**编译函数**(前端需要实现):
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```javascript
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// 将后端 UiHints 编译为 UiSchemaRenderer
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function compileUiHints(hints) {
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// 这里可以调用后端的 compile 接口
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// 或者在前端实现相同的编译逻辑
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return fetch('/api/v1/agent/compile-ui-hints', {
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method: 'POST',
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body: JSON.stringify(hints)
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}).then(r => r.json());
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}
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```
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- events: `ui_schema`(snake_case)
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- history: `ui_schema`(snake_case)
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|
||||
---
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## 6. UiHints 介绍(可选)
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## 6) 推荐消费顺序(面向客户端重构)
|
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如果前端需要自己处理 UiHints,以下是结构:
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### UiHintsPayload
|
||||
|
||||
```typescript
|
||||
interface UiHintsPayload {
|
||||
version: "2.1";
|
||||
intent: "message" | "data" | "list" | "status" | "form" | "mixed";
|
||||
status: "info" | "success" | "warning" | "error" | "pending";
|
||||
|
||||
title?: string;
|
||||
description?: string;
|
||||
body?: string;
|
||||
bodyFormat?: "plain" | "markdown";
|
||||
|
||||
items?: UiHintKvItem[];
|
||||
listItems?: UiHintListItem[];
|
||||
sections?: UiHintSection[];
|
||||
actions?: UiHintAction[];
|
||||
icon?: UiHintIcon;
|
||||
meta?: Record<string, any>;
|
||||
}
|
||||
```
|
||||
|
||||
**注意**:History API 返回的消息已经包含了编译好的 `uiSchema`,前端不需要自己编译。
|
||||
|
||||
---
|
||||
|
||||
## 7. 总结
|
||||
|
||||
1. **多模态**:前端上传附件 → 获取签名 URL → 构造 RunAgentInput → POST /runs
|
||||
2. **实时事件**:订阅 /runs/{threadId}/events → 处理 text.delta/tool.result/text.end → 渲染 UiSchema
|
||||
3. **历史消息**:GET /history → 遍历消息 → 有 uiSchema 则渲染,否则渲染纯文本
|
||||
4. **一致性**:events 和 history 使用同一个 UiSchemaRenderer 渲染组件
|
||||
1. 先以 `/history` 获取首屏快照
|
||||
2. 再接入 `/events` 处理后续增量
|
||||
3. 以 `runId` + `messageId/toolCallId` 做去重与合并
|
||||
4. 统一消费 `ui_schema`
|
||||
|
||||
Reference in New Issue
Block a user