# Async Browser Script 支持实现计划

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** 修改 `build_eval_js` 函数支持异步脚本，解决 Promise 被 JSON.stringify 序列化为 `{}` 的问题。

**Architecture:** 将 `build_eval_js` 生成的 JavaScript 代码从同步 IIFE 改为 async IIFE，用 await 等待脚本执行结果，并检测 Promise-like 对象进行二次等待。

**Tech Stack:** Rust, JavaScript (生成代码)

---

## 文件结构

| 文件 | 操作 | 说明 |
|------|------|------|
| `src/browser/callback_backend.rs` | 修改 | 修改 `build_eval_js` 函数 |
| `tests/browser_script_skill_tool_test.rs` | 新增测试 | 添加异步脚本测试用例 |

---

### Task 1: 修改 build_eval_js 支持异步脚本

**Files:**
- Modify: `src/browser/callback_backend.rs:433-447`

**当前代码:**
```rust
fn build_eval_js(source_url: &str, script: &str) -> String {
    let escaped_source_url = escape_js_single_quoted(source_url);
    let callback = EVAL_CALLBACK_NAME;
    let events_url = escape_js_single_quoted(&events_endpoint_url(source_url));

    format!(
        "(function(){{try{{var v=(function(){{return {script}}})();\
         var t=(typeof v==='string')?v:JSON.stringify(v);\
         try{{callBackJsToCpp('{escaped_source_url}@_@'+window.location.href+'@_@{callback}@_@sgBrowserExcuteJsCodeByDomain@_@'+(t??''))}}catch(_){{}}\
         var j=JSON.stringify({{type:'callback',callback:'{callback}',request_url:'{escaped_source_url}',payload:{{value:(t??'')}}}});\
         try{{var r=new XMLHttpRequest();r.open('POST','{events_url}',true);r.setRequestHeader('Content-Type','application/json');r.send(j)}}catch(_){{}}\
         try{{navigator.sendBeacon('{events_url}',new Blob([j],{{type:'application/json'}}))}}catch(_){{}}\
         }}catch(e){{}}}})()"
    )
}
```

**修改后代码:**
```rust
fn build_eval_js(source_url: &str, script: &str) -> String {
    let escaped_source_url = escape_js_single_quoted(source_url);
    let callback = EVAL_CALLBACK_NAME;
    let events_url = escape_js_single_quoted(&events_endpoint_url(source_url));

    format!(
        "(async function(){{try{{\
         var v=await (async function(){{return {script}}})();\
         if(v&&typeof v.then==='function'){{v=await v;}}\
         var t=(typeof v==='string')?v:JSON.stringify(v);\
         try{{callBackJsToCpp('{escaped_source_url}@_@'+window.location.href+'@_@{callback}@_@sgBrowserExcuteJsCodeByDomain@_@'+(t??''))}}catch(_){{}}\
         var j=JSON.stringify({{type:'callback',callback:'{callback}',request_url:'{escaped_source_url}',payload:{{value:(t??'')}}}});\
         try{{var r=new XMLHttpRequest();r.open('POST','{events_url}',true);r.setRequestHeader('Content-Type','application/json');r.send(j)}}catch(_){{}}\
         try{{navigator.sendBeacon('{events_url}',new Blob([j],{{type:'application/json'}}))}}catch(_){{}}\
         }}catch(e){{}}}})()"
    )
}
```

**关键变更说明:**
1. `(function()` → `(async function()` - 整个 IIFE 变为异步
2. `var v=(function(){return {script}})()` → `var v=await (async function(){return {script}})()` - 内部包装也变为异步并 await
3. 新增 `if(v&&typeof v.then==='function'){v=await v;}` - 检测并等待 Promise-like 对象

- [ ] **Step 1: 修改 build_eval_js 函数**

编辑 `src/browser/callback_backend.rs` 第 433-447 行，替换为上述新代码。

- [ ] **Step 2: 编译验证**

Run: `cargo build`
Expected: 编译成功，无错误

- [ ] **Step 3: 运行现有测试**

Run: `cargo test browser_script_skill_tool`
Expected: 所有测试通过

- [ ] **Step 4: Commit**

```bash
git add src/browser/callback_backend.rs
git commit -m "fix: support async browser scripts in build_eval_js

Wrap eval script in async IIFE and await Promise-like results.
Fixes Promise serialization returning '{}' for async skill scripts.

🤖 Generated with [Qoder][https://qoder.com]"
```

---

### Task 2: 添加异步脚本测试用例

**Files:**
- Modify: `tests/browser_script_skill_tool_test.rs`

- [ ] **Step 1: 添加异步脚本测试用例**

在 `tests/browser_script_skill_tool_test.rs` 文件末尾添加新测试：

```rust
#[tokio::test]
async fn execute_browser_script_tool_awaits_async_script() {
    let skill_dir = unique_temp_dir("sgclaw-browser-script-async");
    let scripts_dir = skill_dir.join("scripts");
    fs::create_dir_all(&scripts_dir).unwrap();
    // 异步脚本，返回 Promise
    fs::write(
        scripts_dir.join("async_extract.js"),
        "return (async function() { return { async: true, args: args }; })();\n",
    )
    .unwrap();

    let transport = Arc::new(MockTransport::new(vec![BrowserMessage::Response {
        seq: 1,
        success: true,
        data: json!({
            "text": {
                "async": true,
                "args": { "expected_domain": "example.com" }
            }
        }),
        aom_snapshot: vec![],
        timing: Timing {
            queue_ms: 1,
            exec_ms: 5,
        },
    }]));

    let mut policy_json = test_policy();
    // 允许 example.com
    policy_json = MacPolicy::from_json_str(
        r#"{
            "version": "1.0",
            "domains": { "allowed": ["www.zhihu.com", "example.com"] },
            "pipe_actions": {
                "allowed": ["click", "type", "navigate", "getText", "eval"],
                "blocked": []
            }
        }"#,
    )
    .unwrap();

    let browser_tool = BrowserPipeTool::new(
        transport.clone(),
        policy_json,
        vec![1, 2, 3, 4, 5, 6, 7, 8],
    )
    .with_response_timeout(Duration::from_secs(1));

    let skill_tool = SkillTool {
        name: "async_extract".to_string(),
        description: "Extract data asynchronously".to_string(),
        kind: "browser_script".to_string(),
        command: "scripts/async_extract.js".to_string(),
        args: HashMap::new(),
    };

    let result = execute_browser_script_tool(
        &skill_tool,
        &skill_dir,
        &PipeBrowserBackend::from_inner(browser_tool),
        json!({
            "expected_domain": "example.com"
        }),
    )
    .await
    .unwrap();

    assert!(result.success);
    let output = serde_json::from_str::<serde_json::Value>(&result.output).unwrap();
    assert_eq!(output["async"], true);
}
```

- [ ] **Step 2: 运行新测试**

Run: `cargo test execute_browser_script_tool_awaits_async_script`
Expected: 测试通过

- [ ] **Step 3: Commit**

```bash
git add tests/browser_script_skill_tool_test.rs
git commit -m "test: add async browser script test case

🤖 Generated with [Qoder][https://qoder.com]"
```

---

### Task 3: 端到端验证

**Files:**
- 无文件修改，仅验证

- [ ] **Step 1: 完整构建**

Run: `cargo build`
Expected: 编译成功

- [ ] **Step 2: 运行全部测试**

Run: `cargo test`
Expected: 所有测试通过

- [ ] **Step 3: 手动端到端测试**

使用 service console 测试 `tq-lineloss-report.collect_lineloss`:
1. 启动 sgclaw: `target/debug/sg_claw.exe`
2. 在 service console 输入: `兰州公司 台区线损大数据 月累计线损率统计分析。。。`
3. 预期结果: 返回实际报表数据，而非 `{}`

---

## 自检清单

- [x] Spec 覆盖: 设计文档中所有要点都有对应任务
- [x] 无占位符: 所有代码都是完整的
- [x] 类型一致性: 函数签名无变化