grok搜索返回TypeError

[Cyriak173]

核心原因

grok.py 第 250 行，流式响应解析时 delta["content"] 为 None，导致 content += None 抛出 TypeError。

###脚本重现

import os, sys, asyncio, traceback, logging

# -------------------------- 加载 .env --------------------------
try:
    from dotenv import load_dotenv
    env_path = '/root/GrokSearchMCP/WebSearchMCP/.env'
    if os.path.exists(env_path):
        load_dotenv(env_path)
        print("✅ 已从 .env 加载环境变量")
    else:
        print(f"❌ 找不到 .env 文件: {env_path}")
        sys.exit(1)
except ImportError:
    print("❌ 请先安装 python-dotenv: pip install python-dotenv")
    sys.exit(1)

api_key = os.getenv("GROK_API_KEY")
if not api_key:
    print("❌ GROK_API_KEY 未设置，请检查 .env")
    sys.exit(1)

api_url = os.getenv("GROK_API_URL", "")
effective_model = os.getenv("GROK_MODEL", "grok-3")
print(f"✅ API Key 前8位: {api_key[:8]}...  模型: {effective_model}")

# -------------------------- 添加项目路径 --------------------------
sys.path.insert(0, '/root/GrokSearchMCP/WebSearchMCP/src')

from web_search.providers.grok import GrokSearchProvider

grok = GrokSearchProvider(api_url, api_key, effective_model)

# -------------------------- 触发错误的查询列表 --------------------------
queries = [
    "linux.do GPT搜索很强 智商高 梗 MCP深入思考",
    "linux.do gpt 能get梗 智商高 搜索 很强",
    'linux.do "GPT" "搜索" "智商高" "梗" 帖子推荐',
    "linux.do GPT 搜索能力 很强 智商 例子",
    'linux.do "gpt" "搜索" "梗" "智商" "MCP" 帖子链接',
    "linux.do GPT搜索很强 智商 梗 例子 MCP 深入思考",
    'linux.do "openai" "玩梗" GPT 搜索 智商 MCP',
    "linux.do GPT 搜索 很强 'sequential thinking' MCP 智商",
    'linux.do "GPT可以" 梗',
]

async def test_query(q):
    print(f"\n--- 测试查询: {q} ---")
    try:
        result = await grok.search(q)
        print(f"✅ 成功，结果长度: {len(str(result))}")
        return True
    except TypeError as e:
        if "can only concatenate str" in str(e):
            print("\n🔥🔥🔥 复现 TypeError！🔥🔥🔥")
            traceback.print_exc()
            # 提取 grok.py 中的出错信息
            exc = traceback.TracebackException.from_exception(e)
            for frame in exc.stack:
                if 'grok.py' in frame.filename:
                    print(f"\n❌ 出错文件: {frame.filename}")
                    print(f"   行号: {frame.lineno}")
                    print(f"   代码: {frame.line}")
                    break
            return False
        else:
            raise
    except Exception as e:
        print(f"其他异常: {type(e).__name__}: {e}")
        traceback.print_exc()
        return False

async def main():
    for query in queries:
        success = await test_query(query)
        if not success:
            print("\n已捕获目标错误，停止测试。")
            return
    print("\n所有查询均未复现 TypeError，可能需要更多样本或延长测试。")

if __name__ == "__main__":
    asyncio.run(main())

报错

✅ 已从 .env 加载环境变量
✅ API Key 前8位: sk-LhkAu...  模型: grok-4.1-fast

--- 测试查询: linux.do GPT搜索很强 智商高 梗 MCP深入思考 ---
✅ 成功，结果长度: 167

--- 测试查询: linux.do gpt 能get梗 智商高 搜索 很强 ---
✅ 成功，结果长度: 546

--- 测试查询: linux.do "GPT" "搜索" "智商高" "梗" 帖子推荐 ---

🔥🔥🔥 复现 TypeError！🔥🔥🔥
Traceback (most recent call last):
  File "/root/GrokSearchMCP/WebSearchMCP/src/web_search/debug_grok.py", line 52, in test_query
    result = await grok.search(q)
  File "/root/GrokSearchMCP/WebSearchMCP/src/web_search/providers/grok.py", line 207, in search
    return await self._execute_stream_with_retry(headers, payload, ctx)
  File "/root/GrokSearchMCP/WebSearchMCP/src/web_search/providers/grok.py", line 273, in _execute_stream_with_retry
    async for attempt in AsyncRetrying(
  File "/usr/local/lib/python3.10/dist-packages/tenacity/asyncio/__init__.py", line 170, in __anext__
    do = await self.iter(retry_state=self._retry_state)
  File "/usr/local/lib/python3.10/dist-packages/tenacity/asyncio/__init__.py", line 157, in iter
    result = await action(retry_state)
  File "/usr/local/lib/python3.10/dist-packages/tenacity/_utils.py", line 111, in inner
    return call(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/tenacity/__init__.py", line 393, in <lambda>
    self._add_action_func(lambda rs: rs.outcome.result())
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 451, in result
    return self.__get_result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
    raise self._exception
  File "/root/GrokSearchMCP/WebSearchMCP/src/web_search/providers/grok.py", line 287, in _execute_stream_with_retry
    return await self._parse_streaming_response(response, ctx)
  File "/root/GrokSearchMCP/WebSearchMCP/src/web_search/providers/grok.py", line 250, in _parse_streaming_response
    content += delta["content"]
TypeError: can only concatenate str (not "NoneType") to str

临时解决办法

将 grok.py 中的

if "content" in delta:
    content += delta["content"]

更改后变为

if "content" in delta:
    content += delta["content"] or ""

后续正常使用搜索无任何报错。