pass mypy strict on the new module

mypy.ini

@@ -9,7 +9,7 @@ no_implicit_optional = True
 warn_redundant_casts = True
 strict_equality = True
 
-[mypy-allmydata.test.cli.wormholetesting]
+[mypy-allmydata.test.cli.wormholetesting,allmydata.listeners]
 disallow_any_generics = True
 disallow_subclassing_any = True
 disallow_untyped_calls = True

src/allmydata/listeners.py

@@ -6,7 +6,7 @@ detect when it is possible to use it, etc.
 
 from __future__ import annotations
 
-from typing import Any, Protocol, Sequence, Mapping, Optional
+from typing import Any, Protocol, Sequence, Mapping, Optional, Union, Awaitable
 from typing_extensions import Literal
 
 from attrs import frozen, define
@@ -101,7 +101,7 @@ class StaticProvider:
     """
     _available: bool
     _hide_ip: bool
-    _config: Any
+    _config: Union[Awaitable[ListenerConfig], ListenerConfig]
     _address: IAddressFamily
 
     def is_available(self) -> bool:
@@ -110,7 +110,9 @@ class StaticProvider:
     def can_hide_ip(self) -> bool:
         return self._hide_ip
 
-    async def create_config(self, reactor: Any, cli_config: Any) -> None:
+    async def create_config(self, reactor: Any, cli_config: Any) -> ListenerConfig:
+        if isinstance(self._config, ListenerConfig):
+            return self._config
         return await self._config
 
     def create(self, reactor: Any, config: Any) -> IAddressFamily:

src/allmydata/util/iputil.py

@@ -1,17 +1,10 @@
 """
 Utilities for getting IP addresses.
-
-Ported to Python 3.
 """
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-from __future__ import unicode_literals
+from future.utils import native_str
 
-from future.utils import PY2, native_str
-if PY2:
-    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
+from typing import Callable
 
 import os, socket
 
@@ -39,6 +32,7 @@ from .gcutil import (
 
 fcntl = requireModule("fcntl")
 
+allocate_tcp_port: Callable[[], int]
 from foolscap.util import allocate_tcp_port # re-exported
 
 try: