fix run_app typing (#4957)

CHANGES/4957.bugfix

@@ -0,0 +1 @@
+Fix run_app typing

aiohttp/web.py

@@ -5,7 +5,18 @@
 from argparse import ArgumentParser
 from collections.abc import Iterable
 from importlib import import_module
-from typing import Any, Awaitable, Callable, List, Optional, Set, Type, Union, cast
+from typing import (
+ Any as Any,
+ Awaitable as Awaitable,
+ Callable as Callable,
+ Iterable as TypingIterable,
+ List as List,
+ Optional as Optional,
+ Set as Set,
+ Type as Type,
+ Union as Union,
+ cast as cast,
+)
 
 from .abc import AbstractAccessLogger
 from .helpers import all_tasks
@@ -270,11 +281,13 @@
 except ImportError: # pragma: no cover
  SSLContext = Any # type: ignore
 
+HostSequence = TypingIterable[str]
+
 
 async def _run_app(
  app: Union[Application, Awaitable[Application]],
  *,
- host: Optional[str] = None,
+ host: Optional[Union[str, HostSequence]] = None,
  port: Optional[int] = None,
  path: Optional[str] = None,
  sock: Optional[socket.socket] = None,
@@ -448,7 +461,7 @@ def run_app(
  app: Union[Application, Awaitable[Application]],
  *,
  debug: bool = False,
- host: Optional[str] = None,
+ host: Optional[Union[str, HostSequence]] = None,
  port: Optional[int] = None,
  path: Optional[str] = None,
  sock: Optional[socket.socket] = None,

tests/test_run_app.py

@@ -459,6 +459,27 @@ def test_run_app_nondefault_host_port(patched_loop, aiohttp_unused_port) -> None
  )
 
 
+def test_run_app_multiple_hosts(patched_loop) -> None:
+ hosts = ("127.0.0.1", "127.0.0.2")
+
+ app = web.Application()
+ web.run_app(app, host=hosts, print=stopper(patched_loop))
+
+ calls = map(
+ lambda h: mock.call(
+ mock.ANY,
+ h,
+ 8080,
+ ssl=None,
+ backlog=128,
+ reuse_address=None,
+ reuse_port=None,
+ ),
+ hosts,
+ )
+ patched_loop.create_server.assert_has_calls(calls)
+
+
 def test_run_app_custom_backlog(patched_loop) -> None:
  app = web.Application()
  web.run_app(app, backlog=10, print=stopper(patched_loop))