feat: 导入 MemRelay 初始源码

backend/src/memrelay/errors.py

@@ -0,0 +1,28 @@
+from typing import Any
+
+from fastapi import FastAPI, Request
+from fastapi.responses import JSONResponse
+
+
+class AppError(Exception):
+    def __init__(
+        self,
+        code: str,
+        message: str,
+        status_code: int = 400,
+        details: dict[str, Any] | None = None,
+    ) -> None:
+        super().__init__(message)
+        self.code = code
+        self.message = message
+        self.status_code = status_code
+        self.details = details
+
+
+def install_error_handlers(app: FastAPI) -> None:
+    @app.exception_handler(AppError)
+    async def handle_app_error(_request: Request, exc: AppError) -> JSONResponse:
+        body: dict[str, Any] = {"error": {"code": exc.code, "message": exc.message}}
+        if exc.details is not None:
+            body["error"]["details"] = exc.details
+        return JSONResponse(status_code=exc.status_code, content=body)