fix: ensure SQL storage initializes in Vercel serverless runtime

app/core/config.py

@@ -6,6 +6,7 @@
 """
 
 from copy import deepcopy
+import asyncio
 from pathlib import Path
 from typing import Any, Dict
 import tomllib
@@ -244,6 +245,8 @@ def __init__(self):
         self._defaults = {}
         self._code_defaults = {}
         self._defaults_loaded = False
+        self._loaded = False
+        self._load_lock = asyncio.Lock()
 
     def register_defaults(self, defaults: Dict[str, Any]):
         """注册代码中定义的默认值"""
@@ -330,9 +333,20 @@ async def load(self):
                 )
 
             self._config = merged
+            self._loaded = True
         except Exception as e:
             logger.error(f"Error loading config: {e}")
             self._config = {}
+            self._loaded = False
+
+    async def ensure_loaded(self):
+        """确保配置至少成功加载一次（按需懒加载，线程安全）"""
+        if self._loaded:
+            return
+        async with self._load_lock:
+            if self._loaded:
+                return
+            await self.load()
 
     def get(self, key: str, default: Any = None) -> Any:
         """

main.py

@@ -23,12 +23,12 @@
 if env_file.exists():
     load_dotenv(env_file)
 
-from fastapi import FastAPI  # noqa: E402
+from fastapi import FastAPI, Request  # noqa: E402
 from fastapi.middleware.cors import CORSMiddleware  # noqa: E402
 from fastapi import Depends  # noqa: E402
 
 from app.core.auth import verify_api_key  # noqa: E402
-from app.core.config import get_config  # noqa: E402
+from app.core.config import config, get_config  # noqa: E402
 from app.core.logger import logger, setup_logging  # noqa: E402
 from app.core.exceptions import register_exception_handlers  # noqa: E402
 from app.core.response_middleware import ResponseLoggerMiddleware  # noqa: E402
@@ -61,7 +61,7 @@ async def lifespan(app: FastAPI):
     register_defaults(get_grok_defaults())
 
     # 2. 加载配置
-    await config.load()
+    await config.ensure_loaded()
 
     # 3. 启动服务显示
     logger.info("Starting Grok2API...")
@@ -131,6 +131,11 @@ def create_app() -> FastAPI:
     # 请求日志和 ID 中间件
     app.add_middleware(ResponseLoggerMiddleware)
 
+    @app.middleware("http")
+    async def ensure_config_loaded(request: Request, call_next):
+        await config.ensure_loaded()
+        return await call_next(request)
+
     # 注册异常处理器
     register_exception_handlers(app)