add driver type prop

nonebot/drivers/__init__.py

@@ -21,6 +21,11 @@ class BaseDriver(abc.ABC):
     def register_adapter(cls, name: str, adapter: Type[Bot]):
         cls._adapters[name] = adapter
 
+    @property
+    @abc.abstractmethod
+    def type(self):
+        raise NotImplementedError
+
     @property
     @abc.abstractmethod
     def server_app(self):

nonebot/drivers/fastapi.py

@@ -36,6 +36,11 @@ class Driver(BaseDriver):
         self._server_app.websocket("/{adapter}/ws")(self._handle_ws_reverse)
         self._server_app.websocket("/{adapter}/ws/")(self._handle_ws_reverse)
 
+    @property
+    @overrides(BaseDriver)
+    def type(self) -> str:
+        return "fastapi"
+
     @property
     @overrides(BaseDriver)
     def server_app(self) -> FastAPI: