possible mongo fix (#3319)

* possible mongo fix

* prevent swallowing the exception

* better log str

redbot/__main__.py

@@ -466,6 +466,10 @@ def main():
         log.info("Shutting down with exit code: %s", exc.code)
         if red is not None:
             loop.run_until_complete(shutdown_handler(red, None, exc.code))
+    except Exception as exc:  # Non standard case.
+        log.exception("Unexpected exception (%s): ", type(exc), exc_info=exc)
+        if red is not None:
+            loop.run_until_complete(shutdown_handler(red, None, ExitCodes.CRITICAL))
     finally:
         # Allows transports to close properly, and prevent new ones from being opened.
         # Transports may still not be closed correcly on windows, see below

redbot/core/config.py

@@ -643,7 +643,14 @@ class Config:
         return pickle.loads(pickle.dumps(self._defaults, -1))
 
     @classmethod
-    def get_conf(cls, cog_instance, identifier: int, force_registration=False, cog_name=None):
+    def get_conf(
+        cls,
+        cog_instance,
+        identifier: int,
+        force_registration=False,
+        cog_name=None,
+        allow_old: bool = False,
+    ):
         """Get a Config instance for your cog.
 
         .. warning::
@@ -676,11 +683,16 @@ class Config:
             A new Config object.
 
         """
+        if allow_old:
+            log.warning(
+                "DANGER! This is getting an outdated driver. "
+                "Hopefully this is only being done from convert"
+            )
         uuid = str(identifier)
         if cog_name is None:
             cog_name = type(cog_instance).__name__
 
-        driver = get_driver(cog_name, uuid)
+        driver = get_driver(cog_name, uuid, allow_old=allow_old)
         if hasattr(driver, "migrate_identifier"):
             driver.migrate_identifier(identifier)
 
@@ -693,7 +705,7 @@ class Config:
         return conf
 
     @classmethod
-    def get_core_conf(cls, force_registration: bool = False):
+    def get_core_conf(cls, force_registration: bool = False, allow_old: bool = False):
         """Get a Config instance for the core bot.
 
         All core modules that require a config instance should use this
@@ -706,7 +718,11 @@ class Config:
 
         """
         return cls.get_conf(
-            None, cog_name="Core", identifier=0, force_registration=force_registration
+            None,
+            cog_name="Core",
+            identifier=0,
+            force_registration=force_registration,
+            allow_old=allow_old,
         )
 
     def __getattr__(self, item: str) -> Union[Group, Value]:
@@ -1457,7 +1473,7 @@ class Config:
 async def migrate(cur_driver_cls: Type[BaseDriver], new_driver_cls: Type[BaseDriver]) -> None:
     """Migrate from one driver type to another."""
     # Get custom group data
-    core_conf = Config.get_core_conf()
+    core_conf = Config.get_core_conf(allow_old=True)
     core_conf.init_custom("CUSTOM_GROUPS", 2)
     all_custom_group_data = await core_conf.custom("CUSTOM_GROUPS").all()
 

redbot/core/drivers/__init__.py

@@ -73,7 +73,12 @@ def get_driver_class(storage_type: Optional[BackendType] = None) -> Type[BaseDri
 
 
 def get_driver(
-    cog_name: str, identifier: str, storage_type: Optional[BackendType] = None, **kwargs
+    cog_name: str,
+    identifier: str,
+    storage_type: Optional[BackendType] = None,
+    *,
+    allow_old: bool = False,
+    **kwargs,
 ):
     """Get a driver instance.
 
@@ -107,7 +112,10 @@ def get_driver(
             storage_type = BackendType.JSON
 
     try:
-        driver_cls: Type[BaseDriver] = get_driver_class(storage_type)
+        if not allow_old:
+            driver_cls: Type[BaseDriver] = get_driver_class(storage_type)
+        else:
+            driver_cls: Type[BaseDriver] = _get_driver_class_include_old(storage_type)
     except ValueError:
         if storage_type in (BackendType.MONGOV1, BackendType.MONGO):
             raise RuntimeError(