Move private things in modlog and redbot.core.errors (#6020)

redbot/core/_drivers/_mongo.py

@@ -18,7 +18,7 @@ except ModuleNotFoundError:
     pymongo = None
 
 from .. import errors
-from .base import BaseDriver, IdentifierData
+from .base import BaseDriver, IdentifierData, MissingExtraRequirements
 
 __all__ = ["MongoDriver"]
 
@@ -33,7 +33,7 @@ class MongoDriver(BaseDriver):
     @classmethod
     async def initialize(cls, **storage_details) -> None:
         if motor is None:
-            raise errors.MissingExtraRequirements(
+            raise MissingExtraRequirements(
                 "Red must be installed with the [mongo] extra to use the MongoDB driver"
             )
         uri = storage_details.get("URI", "mongodb")

redbot/core/_drivers/base.py

@@ -6,7 +6,11 @@ import rich.progress
 
 from redbot.core.utils._internal_utils import RichIndefiniteBarColumn
 
-__all__ = ["BaseDriver", "IdentifierData", "ConfigCategory"]
+__all__ = ("BaseDriver", "IdentifierData", "ConfigCategory", "MissingExtraRequirements")
+
+
+class MissingExtraRequirements(Exception):
+    """Raised when an extra requirement is missing but required."""
 
 
 class ConfigCategory(str, enum.Enum):

redbot/core/_drivers/postgres/postgres.py

@@ -11,7 +11,7 @@ except ModuleNotFoundError:
     asyncpg = None
 
 from ... import data_manager, errors
-from ..base import BaseDriver, IdentifierData, ConfigCategory
+from ..base import BaseDriver, IdentifierData, ConfigCategory, MissingExtraRequirements
 from ..log import log
 
 __all__ = ["PostgresDriver"]
@@ -41,7 +41,7 @@ class PostgresDriver(BaseDriver):
     @classmethod
     async def initialize(cls, **storage_details) -> None:
         if asyncpg is None:
-            raise errors.MissingExtraRequirements(
+            raise MissingExtraRequirements(
                 "Red must be installed with the [postgres] extra to use the PostgreSQL driver"
             )
         cls._pool = await asyncpg.create_pool(**storage_details)