repos/aio-libs-aiohttp-b668a0b/tests/test_run_app.py

import asyncio
import contextlib
import logging
import os
import platform
import signal
import socket
import ssl
import subprocess
import sys
import time
from typing import Callable, NoReturn, Set
from unittest import mock
from uuid import uuid4

import pytest

from aiohttp import ClientConnectorError, ClientSession, ClientTimeout, WSCloseCode, web
from aiohttp.test_utils import make_mocked_coro
from aiohttp.web_runner import BaseRunner

# Test for features of OS' socket support
if hasattr(socket, "AF_UNIX"):
    with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as _abstract_path_sock:
        try:
            _abstract_path_sock.bind(b"\x00" + uuid4().hex.encode("ascii"))
        except FileNotFoundError:
            _abstract_path_failed = True
        else:
            _abstract_path_failed = False
        finally:
            del _abstract_path_sock
else:
    _abstract_path_failed = True

skip_if_no_abstract_paths = pytest.mark.skipif(
    _abstract_path_failed, reason="Linux-style abstract paths are not supported."
)
del _abstract_path_failed

HAS_IPV6 = socket.has_ipv6
if HAS_IPV6:
    # The socket.has_ipv6 flag may be True if Python was built with IPv6
    # support, but the target system still may not have it.
    # So let's ensure that we really have IPv6 support.
    try:
        with socket.socket(socket.AF_INET6, socket.SOCK_STREAM):
            pass
    except OSError:
        HAS_IPV6 = False


def skip_if_on_windows():
    if platform.system() == "Windows":
        pytest.skip("the test is not valid for Windows")


@pytest.fixture
def patched_loop(loop):
    server = mock.Mock()
    server.wait_closed = make_mocked_coro(None)
    loop.create_server = make_mocked_coro(server)
    unix_server = mock.Mock()
    unix_server.wait_closed = make_mocked_coro(None)
    loop.create_unix_server = make_mocked_coro(unix_server)
    asyncio.set_event_loop(loop)
    return loop


def stopper(loop):
    def raiser():
        raise KeyboardInterrupt

    def f(*args):
        loop.call_soon(raiser)

    return f


def test_run_app_http(patched_loop) -> None:
    app = web.Application()
    startup_handler = make_mocked_coro()
    app.on_startup.append(startup_handler)
    cleanup_handler = make_mocked_coro()
    app.on_cleanup.append(cleanup_handler)

    web.run_app(app, print=stopper(patched_loop), loop=patched_loop)

    patched_loop.create_server.assert_called_with(
        mock.ANY, None, 8080, ssl=None, backlog=128, reuse_address=None, reuse_port=None
    )
    startup_handler.assert_called_once_with(app)
    cleanup_handler.assert_called_once_with(app)


def test_run_app_close_loop(patched_loop) -> None:
    app = web.Application()
    web.run_app(app, print=stopper(patched_loop), loop=patched_loop)

    patched_loop.create_server.assert_called_with(
        mock.ANY, None, 8080, ssl=None, backlog=128, reuse_address=None, reuse_port=None
    )
    assert patched_loop.is_closed()


mock_unix_server_single = [
    mock.call(mock.ANY, "/tmp/testsock1.sock", ssl=None, backlog=128),
]
mock_unix_server_multi = [
    mock.call(mock.ANY, "/tmp/testsock1.sock", ssl=None, backlog=128),
    mock.call(mock.ANY, "/tmp/testsock2.sock", ssl=None, backlog=128),
]
mock_server_single = [
    mock.call(
        mock.ANY,
        "127.0.0.1",
        8080,
        ssl=None,
        backlog=128,
        reuse_address=None,
        reuse_port=None,
    ),
]
mock_server_multi = [
    mock.call(
        mock.ANY,
        "127.0.0.1",
        8080,
        ssl=None,
        backlog=128,
        reuse_address=None,
        reuse_port=None,
    ),
    mock.call(
        mock.ANY,
        "192.168.1.1",
        8080,
        ssl=None,
        backlog=128,
        reuse_address=None,
        reuse_port=None,
    ),
]
mock_server_default_8989 = [
    mock.call(
        mock.ANY, None, 8989, ssl=None, backlog=128, reuse_address=None, reuse_port=None
    )
]
mock_socket = mock.Mock(getsockname=lambda: ("mock-socket", 123))
mixed_bindings_tests = (
    (  # type: ignore
        "Nothing Specified",
        {},
        [
            mock.call(
                mock.ANY,
                None,
                8080,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=None,
            )
        ],
        [],
    ),
    ("Port Only", {"port": 8989}, mock_server_default_8989, []),
    ("Multiple Hosts", {"host": ("127.0.0.1", "192.168.1.1")}, mock_server_multi, []),
    (
        "Multiple Paths",
        {"path": ("/tmp/testsock1.sock", "/tmp/testsock2.sock")},
        [],
        mock_unix_server_multi,
    ),
    (
        "Multiple Paths, Port",
        {"path": ("/tmp/testsock1.sock", "/tmp/testsock2.sock"), "port": 8989},
        mock_server_default_8989,
        mock_unix_server_multi,
    ),
    (
        "Multiple Paths, Single Host",
        {"path": ("/tmp/testsock1.sock", "/tmp/testsock2.sock"), "host": "127.0.0.1"},
        mock_server_single,
        mock_unix_server_multi,
    ),
    (
        "Single Path, Single Host",
        {"path": "/tmp/testsock1.sock", "host": "127.0.0.1"},
        mock_server_single,
        mock_unix_server_single,
    ),
    (
        "Single Path, Multiple Hosts",
        {"path": "/tmp/testsock1.sock", "host": ("127.0.0.1", "192.168.1.1")},
        mock_server_multi,
        mock_unix_server_single,
    ),
    (
        "Single Path, Port",
        {"path": "/tmp/testsock1.sock", "port": 8989},
        mock_server_default_8989,
        mock_unix_server_single,
    ),
    (
        "Multiple Paths, Multiple Hosts, Port",
        {
            "path": ("/tmp/testsock1.sock", "/tmp/testsock2.sock"),
            "host": ("127.0.0.1", "192.168.1.1"),
            "port": 8000,
        },
        [
            mock.call(
                mock.ANY,
                "127.0.0.1",
                8000,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=None,
            ),
            mock.call(
                mock.ANY,
                "192.168.1.1",
                8000,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=None,
            ),
        ],
        mock_unix_server_multi,
    ),
    (
        "Only socket",
        {"sock": [mock_socket]},
        [mock.call(mock.ANY, ssl=None, sock=mock_socket, backlog=128)],
        [],
    ),
    (
        "Socket, port",
        {"sock": [mock_socket], "port": 8765},
        [
            mock.call(
                mock.ANY,
                None,
                8765,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=None,
            ),
            mock.call(mock.ANY, sock=mock_socket, ssl=None, backlog=128),
        ],
        [],
    ),
    (
        "Socket, Host, No port",
        {"sock": [mock_socket], "host": "localhost"},
        [
            mock.call(
                mock.ANY,
                "localhost",
                8080,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=None,
            ),
            mock.call(mock.ANY, sock=mock_socket, ssl=None, backlog=128),
        ],
        [],
    ),
    (
        "reuse_port",
        {"reuse_port": True},
        [
            mock.call(
                mock.ANY,
                None,
                8080,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=True,
            )
        ],
        [],
    ),
    (
        "reuse_address",
        {"reuse_address": False},
        [
            mock.call(
                mock.ANY,
                None,
                8080,
                ssl=None,
                backlog=128,
                reuse_address=False,
                reuse_port=None,
            )
        ],
        [],
    ),
    (
        "reuse_port, reuse_address",
        {"reuse_address": True, "reuse_port": True},
        [
            mock.call(
                mock.ANY,
                None,
                8080,
                ssl=None,
                backlog=128,
                reuse_address=True,
                reuse_port=True,
            )
        ],
        [],
    ),
    (
        "Port, reuse_port",
        {"port": 8989, "reuse_port": True},
        [
            mock.call(
                mock.ANY,
                None,
                8989,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=True,
            )
        ],
        [],
    ),
    (
        "Multiple Hosts, reuse_port",
        {"host": ("127.0.0.1", "192.168.1.1"), "reuse_port": True},
        [
            mock.call(
                mock.ANY,
                "127.0.0.1",
                8080,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=True,
            ),
            mock.call(
                mock.ANY,
                "192.168.1.1",
                8080,
                ssl=None,
                backlog=128,
                reuse_address=None,
                reuse_port=True,
            ),
        ],
        [],
    ),
    (
        "Multiple Paths, Port, reuse_address",
        {
            "path": ("/tmp/testsock1.sock", "/tmp/testsock2.sock"),
            "port": 8989,
            "reuse_address": False,
        },
        [
            mock.call(
                mock.ANY,
                None,
                8989,
                ssl=None,
                backlog=128,
                reuse_address=False,
                reuse_port=None,
            )
        ],
        mock_unix_server_multi,
    ),
    (
        "Multiple Paths, Single Host, reuse_address, reuse_port",
        {
            "path": ("/tmp/testsock1.sock", "/tmp/testsock2.sock"),
            "host": "127.0.0.1",
            "reuse_address": True,
            "reuse_port": True,
        },
        [
            mock.call(
                mock.ANY,
                "127.0.0.1",
                8080,
                ssl=None,
                backlog=128,
                reuse_address=True,
                reuse_port=True,
            ),
        ],
        mock_unix_server_multi,
    ),
)
mixed_bindings_test_ids = [test[0] for test in mixed_bindings_tests]
mixed_bindings_test_params = [test[1:] for test in mixed_bindings_tests]


@pytest.mark.parametrize(
    "run_app_kwargs, expected_server_calls, expected_unix_server_calls",
    mixed_bindings_test_params,
    ids=mixed_bindings_test_ids,
)
def test_run_app_mixed_bindings(
    run_app_kwargs, expected_server_calls, expected_unix_server_calls, patched_loop
):
    app = web.Application()
    web.run_app(app, print=stopper(patched_loop), **run_app_kwargs, loop=patched_loop)

    assert patched_loop.create_unix_server.mock_calls == expected_unix_server_calls
    assert patched_loop.create_server.mock_calls == expected_server_calls


def test_run_app_https(patched_loop) -> None:
    app = web.Application()

    ssl_context = ssl.create_default_context()
    web.run_app(
        app, ssl_context=ssl_context, print=stopper(patched_loop), loop=patched_loop
    )

    patched_loop.create_server.assert_called_with(
        mock.ANY,
        None,
        8443,
        ssl=ssl_context,
        backlog=128,
        reuse_address=None,
        reuse_port=None,
    )


def test_run_app_nondefault_host_port(patched_loop, aiohttp_unused_port) -> None:
    port = aiohttp_unused_port()
    host = "127.0.0.1"

    app = web.Application()
    web.run_app(
        app, host=host, port=port, print=stopper(patched_loop), loop=patched_loop
    )

    patched_loop.create_server.assert_called_with(
        mock.ANY, host, port, ssl=None, backlog=128, reuse_address=None, reuse_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), loop=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), loop=patched_loop)

    patched_loop.create_server.assert_called_with(
        mock.ANY, None, 8080, ssl=None, backlog=10, reuse_address=None, reuse_port=None
    )


def test_run_app_custom_backlog_unix(patched_loop) -> None:
    app = web.Application()
    web.run_app(
        app,
        path="/tmp/tmpsock.sock",
        backlog=10,
        print=stopper(patched_loop),
        loop=patched_loop,
    )

    patched_loop.create_unix_server.assert_called_with(
        mock.ANY, "/tmp/tmpsock.sock", ssl=None, backlog=10
    )


def test_run_app_http_unix_socket(patched_loop, unix_sockname) -> None:
    app = web.Application()

    printer = mock.Mock(wraps=stopper(patched_loop))
    web.run_app(app, path=unix_sockname, print=printer, loop=patched_loop)

    patched_loop.create_unix_server.assert_called_with(
        mock.ANY, unix_sockname, ssl=None, backlog=128
    )
    assert f"http://unix:{unix_sockname}:" in printer.call_args[0][0]


def test_run_app_https_unix_socket(patched_loop, unix_sockname) -> None:
    app = web.Application()

    ssl_context = ssl.create_default_context()
    printer = mock.Mock(wraps=stopper(patched_loop))
    web.run_app(
        app,
        path=unix_sockname,
        ssl_context=ssl_context,
        print=printer,
        loop=patched_loop,
    )

    patched_loop.create_unix_server.assert_called_with(
        mock.ANY, unix_sockname, ssl=ssl_context, backlog=128
    )
    assert f"https://unix:{unix_sockname}:" in printer.call_args[0][0]


@pytest.mark.skipif(not hasattr(socket, "AF_UNIX"), reason="requires UNIX sockets")
@skip_if_no_abstract_paths
def test_run_app_abstract_linux_socket(patched_loop) -> None:
    sock_path = b"\x00" + uuid4().hex.encode("ascii")
    app = web.Application()
    web.run_app(
        app,
        path=sock_path.decode("ascii", "ignore"),
        print=stopper(patched_loop),
        loop=patched_loop,
    )

    patched_loop.create_unix_server.assert_called_with(
        mock.ANY, sock_path.decode("ascii"), ssl=None, backlog=128
    )


def test_run_app_preexisting_inet_socket(patched_loop, mocker) -> None:
    app = web.Application()

    sock = socket.socket()
    with contextlib.closing(sock):
        sock.bind(("127.0.0.1", 0))
        _, port = sock.getsockname()

        printer = mock.Mock(wraps=stopper(patched_loop))
        web.run_app(app, sock=sock, print=printer, loop=patched_loop)

        patched_loop.create_server.assert_called_with(
            mock.ANY, sock=sock, backlog=128, ssl=None
        )
        assert f"http://127.0.0.1:{port}" in printer.call_args[0][0]


@pytest.mark.skipif(not HAS_IPV6, reason="IPv6 is not available")
def test_run_app_preexisting_inet6_socket(patched_loop) -> None:
    app = web.Application()

    sock = socket.socket(socket.AF_INET6)
    with contextlib.closing(sock):
        sock.bind(("::1", 0))
        port = sock.getsockname()[1]

        printer = mock.Mock(wraps=stopper(patched_loop))
        web.run_app(app, sock=sock, print=printer, loop=patched_loop)

        patched_loop.create_server.assert_called_with(
            mock.ANY, sock=sock, backlog=128, ssl=None
        )
        assert f"http://[::1]:{port}" in printer.call_args[0][0]


@pytest.mark.skipif(not hasattr(socket, "AF_UNIX"), reason="requires UNIX sockets")
def test_run_app_preexisting_unix_socket(patched_loop, mocker) -> None:
    app = web.Application()

    sock_path = "/tmp/test_preexisting_sock1"
    sock = socket.socket(socket.AF_UNIX)
    with contextlib.closing(sock):
        sock.bind(sock_path)
        os.unlink(sock_path)

        printer = mock.Mock(wraps=stopper(patched_loop))
        web.run_app(app, sock=sock, print=printer, loop=patched_loop)

        patched_loop.create_server.assert_called_with(
            mock.ANY, sock=sock, backlog=128, ssl=None
        )
        assert f"http://unix:{sock_path}:" in printer.call_args[0][0]


def test_run_app_multiple_preexisting_sockets(patched_loop) -> None:
    app = web.Application()

    sock1 = socket.socket()
    sock2 = socket.socket()
    with contextlib.closing(sock1), contextlib.closing(sock2):
        sock1.bind(("localhost", 0))
        _, port1 = sock1.getsockname()
        sock2.bind(("localhost", 0))
        _, port2 = sock2.getsockname()

        printer = mock.Mock(wraps=stopper(patched_loop))
        web.run_app(app, sock=(sock1, sock2), print=printer, loop=patched_loop)

        patched_loop.create_server.assert_has_calls(
            [
                mock.call(mock.ANY, sock=sock1, backlog=128, ssl=None),
                mock.call(mock.ANY, sock=sock2, backlog=128, ssl=None),
            ]
        )
        assert f"http://127.0.0.1:{port1}" in printer.call_args[0][0]
        assert f"http://127.0.0.1:{port2}" in printer.call_args[0][0]


_script_test_signal = """
from aiohttp import web

app = web.Application()
web.run_app(app, host=())
"""


def test_sigint() -> None:
    skip_if_on_windows()

    with subprocess.Popen(
        [sys.executable, "-u", "-c", _script_test_signal],
        stdout=subprocess.PIPE,
    ) as proc:
        for line in proc.stdout:
            if line.startswith(b"======== Running on"):
                break
        proc.send_signal(signal.SIGINT)
        assert proc.wait() == 0


def test_sigterm() -> None:
    skip_if_on_windows()

    with subprocess.Popen(
        [sys.executable, "-u", "-c", _script_test_signal],
        stdout=subprocess.PIPE,
    ) as proc:
        for line in proc.stdout:
            if line.startswith(b"======== Running on"):
                break
        proc.terminate()
        assert proc.wait() == 0


def test_startup_cleanup_signals_even_on_failure(patched_loop) -> None:
    patched_loop.create_server = mock.Mock(side_effect=RuntimeError())

    app = web.Application()
    startup_handler = make_mocked_coro()
    app.on_startup.append(startup_handler)
    cleanup_handler = make_mocked_coro()
    app.on_cleanup.append(cleanup_handler)

    with pytest.raises(RuntimeError):
        web.run_app(app, print=stopper(patched_loop), loop=patched_loop)

    startup_handler.assert_called_once_with(app)
    cleanup_handler.assert_called_once_with(app)


def test_run_app_coro(patched_loop) -> None:
    startup_handler = cleanup_handler = None

    async def make_app():
        nonlocal startup_handler, cleanup_handler
        app = web.Application()
        startup_handler = make_mocked_coro()
        app.on_startup.append(startup_handler)
        cleanup_handler = make_mocked_coro()
        app.on_cleanup.append(cleanup_handler)
        return app

    web.run_app(make_app(), print=stopper(patched_loop), loop=patched_loop)

    patched_loop.create_server.assert_called_with(
        mock.ANY, None, 8080, ssl=None, backlog=128, reuse_address=None, reuse_port=None
    )
    startup_handler.assert_called_once_with(mock.ANY)
    cleanup_handler.assert_called_once_with(mock.ANY)


def test_run_app_default_logger(monkeypatch, patched_loop):
    patched_loop.set_debug(True)
    logger = web.access_logger
    attrs = {
        "hasHandlers.return_value": False,
        "level": logging.NOTSET,
        "name": "aiohttp.access",
    }
    mock_logger = mock.create_autospec(logger, name="mock_access_logger")
    mock_logger.configure_mock(**attrs)

    app = web.Application()
    web.run_app(
        app,
        print=stopper(patched_loop),
        access_log=mock_logger,
        loop=patched_loop,
    )
    mock_logger.setLevel.assert_any_call(logging.DEBUG)
    mock_logger.hasHandlers.assert_called_with()
    assert isinstance(mock_logger.addHandler.call_args[0][0], logging.StreamHandler)


def test_run_app_default_logger_setup_requires_debug(patched_loop):
    patched_loop.set_debug(False)
    logger = web.access_logger
    attrs = {
        "hasHandlers.return_value": False,
        "level": logging.NOTSET,
        "name": "aiohttp.access",
    }
    mock_logger = mock.create_autospec(logger, name="mock_access_logger")
    mock_logger.configure_mock(**attrs)

    app = web.Application()
    web.run_app(
        app,
        print=stopper(patched_loop),
        access_log=mock_logger,
        loop=patched_loop,
    )
    mock_logger.setLevel.assert_not_called()
    mock_logger.hasHandlers.assert_not_called()
    mock_logger.addHandler.assert_not_called()


def test_run_app_default_logger_setup_requires_default_logger(patched_loop):
    patched_loop.set_debug(True)
    logger = web.access_logger
    attrs = {
        "hasHandlers.return_value": False,
        "level": logging.NOTSET,
        "name": None,
    }
    mock_logger = mock.create_autospec(logger, name="mock_access_logger")
    mock_logger.configure_mock(**attrs)

    app = web.Application()
    web.run_app(
        app,
        print=stopper(patched_loop),
        access_log=mock_logger,
        loop=patched_loop,
    )
    mock_logger.setLevel.assert_not_called()
    mock_logger.hasHandlers.assert_not_called()
    mock_logger.addHandler.assert_not_called()


def test_run_app_default_logger_setup_only_if_unconfigured(patched_loop):
    patched_loop.set_debug(True)
    logger = web.access_logger
    attrs = {
        "hasHandlers.return_value": True,
        "level": None,
        "name": "aiohttp.access",
    }
    mock_logger = mock.create_autospec(logger, name="mock_access_logger")
    mock_logger.configure_mock(**attrs)

    app = web.Application()
    web.run_app(
        app,
        print=stopper(patched_loop),
        access_log=mock_logger,
        loop=patched_loop,
    )
    mock_logger.setLevel.assert_not_called()
    mock_logger.hasHandlers.assert_called_with()
    mock_logger.addHandler.assert_not_called()


def test_run_app_cancels_all_pending_tasks(patched_loop):
    app = web.Application()
    task = None

    async def on_startup(app):
        nonlocal task
        loop = asyncio.get_event_loop()
        task = loop.create_task(asyncio.sleep(1000))

    app.on_startup.append(on_startup)

    web.run_app(app, print=stopper(patched_loop), loop=patched_loop)
    assert task.cancelled()


def test_run_app_cancels_done_tasks(patched_loop):
    app = web.Application()
    task = None

    async def coro():
        return 123

    async def on_startup(app):
        nonlocal task
        loop = asyncio.get_event_loop()
        task = loop.create_task(coro())

    app.on_startup.append(on_startup)

    web.run_app(app, print=stopper(patched_loop), loop=patched_loop)
    assert task.done()


def test_run_app_cancels_failed_tasks(patched_loop):
    app = web.Application()
    task = None

    exc = RuntimeError("FAIL")

    async def fail():
        try:
            await asyncio.sleep(1000)
        except asyncio.CancelledError:
            raise exc

    async def on_startup(app):
        nonlocal task
        loop = asyncio.get_event_loop()
        task = loop.create_task(fail())
        await asyncio.sleep(0.01)

    app.on_startup.append(on_startup)

    exc_handler = mock.Mock()
    patched_loop.set_exception_handler(exc_handler)
    web.run_app(app, print=stopper(patched_loop), loop=patched_loop)
    assert task.done()

    msg = {
        "message": "unhandled exception during asyncio.run() shutdown",
        "exception": exc,
        "task": task,
    }
    exc_handler.assert_called_with(patched_loop, msg)


def test_run_app_keepalive_timeout(patched_loop, mocker, monkeypatch):
    new_timeout = 1234
    base_runner_init_orig = BaseRunner.__init__

    def base_runner_init_spy(self, *args, **kwargs):
        assert kwargs["keepalive_timeout"] == new_timeout
        base_runner_init_orig(self, *args, **kwargs)

    app = web.Application()
    monkeypatch.setattr(BaseRunner, "__init__", base_runner_init_spy)
    web.run_app(
        app,
        keepalive_timeout=new_timeout,
        print=stopper(patched_loop),
        loop=patched_loop,
    )


def test_run_app_context_vars(patched_loop):
    from contextvars import ContextVar

    count = 0
    VAR = ContextVar("VAR", default="default")

    async def on_startup(app):
        nonlocal count
        assert "init" == VAR.get()
        VAR.set("on_startup")
        count += 1

    async def on_cleanup(app):
        nonlocal count
        assert "on_startup" == VAR.get()
        count += 1

    async def init():
        nonlocal count
        assert "default" == VAR.get()
        VAR.set("init")
        app = web.Application()

        app.on_startup.append(on_startup)
        app.on_cleanup.append(on_cleanup)
        count += 1
        return app

    web.run_app(init(), print=stopper(patched_loop), loop=patched_loop)
    assert count == 3


class TestShutdown:
    def raiser(self) -> NoReturn:
        raise KeyboardInterrupt

    async def stop(self, request: web.Request) -> web.Response:
        asyncio.get_running_loop().call_soon(self.raiser)
        return web.Response()

    def run_app(self, port: int, timeout: int, task, extra_test=None) -> asyncio.Task:
        num_connections = -1

        class DictRecordClear(dict):
            def clear(self):
                nonlocal num_connections
                # During Server.shutdown() we want to know how many connections still
                # remained before it got cleared. If the handler completed successfully
                # the connection should've been removed already. If not, this may
                # indicate a memory leak.
                num_connections = len(self)
                super().clear()

        class ServerWithRecordClear(web.Server):
            def __init__(self, *args, **kwargs):
                super().__init__(*args, **kwargs)
                self._connections = DictRecordClear()

        async def test() -> None:
            await asyncio.sleep(0.5)
            async with ClientSession() as sess:
                for _ in range(5):  # pragma: no cover
                    try:
                        with pytest.raises(asyncio.TimeoutError):
                            async with sess.get(
                                f"http://localhost:{port}/",
                                timeout=ClientTimeout(total=0.1),
                            ):
                                pass
                    except ClientConnectorError:
                        await asyncio.sleep(0.5)
                    else:
                        break
                async with sess.get(f"http://localhost:{port}/stop"):
                    pass

                if extra_test:
                    await extra_test(sess)

        async def run_test(app: web.Application) -> None:
            nonlocal test_task
            test_task = asyncio.create_task(test())
            yield
            await test_task

        async def handler(request: web.Request) -> web.Response:
            nonlocal t
            t = asyncio.create_task(task())
            await t
            return web.Response(text="FOO")

        t = test_task = None
        app = web.Application()
        app.cleanup_ctx.append(run_test)
        app.router.add_get("/", handler)
        app.router.add_get("/stop", self.stop)

        with mock.patch("aiohttp.web_app.Server", ServerWithRecordClear):
            web.run_app(app, port=port, shutdown_timeout=timeout)
        assert test_task.exception() is None
        return t, num_connections

    def test_shutdown_wait_for_handler(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        finished = False

        async def task():
            nonlocal finished
            await asyncio.sleep(2)
            finished = True

        t, connection_count = self.run_app(port, 3, task)

        assert finished is True
        assert t.done()
        assert not t.cancelled()
        assert connection_count == 0

    def test_shutdown_timeout_handler(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        finished = False

        async def task():
            nonlocal finished
            await asyncio.sleep(2)
            finished = True

        t, connection_count = self.run_app(port, 1, task)

        assert finished is False
        assert t.done()
        assert t.cancelled()
        assert connection_count == 1

    def test_shutdown_timeout_not_reached(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        finished = False

        async def task():
            nonlocal finished
            await asyncio.sleep(1)
            finished = True

        start_time = time.time()
        t, connection_count = self.run_app(port, 15, task)

        assert finished is True
        assert t.done()
        assert connection_count == 0
        # Verify run_app has not waited for timeout.
        assert time.time() - start_time < 10

    def test_shutdown_new_conn_rejected(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        finished = False

        async def task() -> None:
            nonlocal finished
            await asyncio.sleep(9)
            finished = True

        async def test(sess: ClientSession) -> None:
            # Ensure we are in the middle of shutdown (waiting for task()).
            await asyncio.sleep(1)
            with pytest.raises(ClientConnectorError):
                # Use a new session to try and open a new connection.
                async with ClientSession() as sess:
                    async with sess.get(f"http://localhost:{port}/"):
                        pass
            assert finished is False

        t, connection_count = self.run_app(port, 10, task, test)

        assert finished is True
        assert t.done()
        assert connection_count == 0

    def test_shutdown_pending_handler_responds(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        finished = False

        async def test() -> None:
            async def test_resp(sess):
                async with sess.get(f"http://localhost:{port}/") as resp:
                    assert await resp.text() == "FOO"

            await asyncio.sleep(1)
            async with ClientSession() as sess:
                t = asyncio.create_task(test_resp(sess))
                await asyncio.sleep(1)
                # Handler is in-progress while we trigger server shutdown.
                async with sess.get(f"http://localhost:{port}/stop"):
                    pass

                assert finished is False
                # Handler should still complete and produce a response.
                await t

        async def run_test(app: web.Application) -> None:
            nonlocal t
            t = asyncio.create_task(test())
            yield
            await t

        async def handler(request: web.Request) -> web.Response:
            nonlocal finished
            await asyncio.sleep(3)
            finished = True
            return web.Response(text="FOO")

        t = None
        app = web.Application()
        app.cleanup_ctx.append(run_test)
        app.router.add_get("/", handler)
        app.router.add_get("/stop", self.stop)

        web.run_app(app, port=port, shutdown_timeout=5)
        assert t.exception() is None
        assert finished is True

    def test_shutdown_close_idle_keepalive(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()

        async def test() -> None:
            await asyncio.sleep(1)
            async with ClientSession() as sess:
                async with sess.get(f"http://localhost:{port}/stop"):
                    pass

                # Hold on to keep-alive connection.
                await asyncio.sleep(5)

        async def run_test(app: web.Application) -> None:
            nonlocal t
            t = asyncio.create_task(test())
            yield
            t.cancel()
            with contextlib.suppress(asyncio.CancelledError):
                await t

        t = None
        app = web.Application()
        app.cleanup_ctx.append(run_test)
        app.router.add_get("/stop", self.stop)

        web.run_app(app, port=port, shutdown_timeout=10)
        # If connection closed, then test() will be cancelled in cleanup_ctx.
        # If not, then shutdown_timeout will allow it to sleep until complete.
        assert t.cancelled()

    def test_shutdown_close_websockets(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        WS = web.AppKey("ws", Set[web.WebSocketResponse])
        client_finished = server_finished = False

        async def ws_handler(request: web.Request) -> web.WebSocketResponse:
            ws = web.WebSocketResponse()
            await ws.prepare(request)
            request.app[WS].add(ws)
            async for msg in ws:
                pass
            nonlocal server_finished
            server_finished = True
            return ws

        async def close_websockets(app: web.Application) -> None:
            for ws in app[WS]:
                await ws.close(code=WSCloseCode.GOING_AWAY)

        async def test() -> None:
            await asyncio.sleep(1)
            async with ClientSession() as sess:
                async with sess.ws_connect(f"http://localhost:{port}/ws") as ws:
                    async with sess.get(f"http://localhost:{port}/stop"):
                        pass

                    async for msg in ws:
                        pass
                    nonlocal client_finished
                    client_finished = True

        async def run_test(app: web.Application) -> None:
            nonlocal t
            t = asyncio.create_task(test())
            yield
            t.cancel()
            with contextlib.suppress(asyncio.CancelledError):
                await t

        t = None
        app = web.Application()
        app[WS] = set()
        app.on_shutdown.append(close_websockets)
        app.cleanup_ctx.append(run_test)
        app.router.add_get("/ws", ws_handler)
        app.router.add_get("/stop", self.stop)

        start = time.time()
        web.run_app(app, port=port, shutdown_timeout=10)
        assert time.time() - start < 5
        assert client_finished
        assert server_finished

    def test_shutdown_handler_cancellation_suppressed(
        self, aiohttp_unused_port: Callable[[], int]
    ) -> None:
        port = aiohttp_unused_port()
        actions = []

        async def test() -> None:
            async def test_resp(sess):
                t = ClientTimeout(total=0.4)
                with pytest.raises(asyncio.TimeoutError):
                    async with sess.get(f"http://localhost:{port}/", timeout=t) as resp:
                        assert await resp.text() == "FOO"
                actions.append("CANCELLED")

            async with ClientSession() as sess:
                t = asyncio.create_task(test_resp(sess))
                await asyncio.sleep(0.5)
                # Handler is in-progress while we trigger server shutdown.
                actions.append("PRESTOP")
                async with sess.get(f"http://localhost:{port}/stop"):
                    pass

                actions.append("STOPPING")
                # Handler should still complete and produce a response.
                await t

        async def run_test(app: web.Application) -> None:
            nonlocal t
            t = asyncio.create_task(test())
            yield
            await t

        async def handler(request: web.Request) -> web.Response:
            try:
                await asyncio.sleep(5)
            except asyncio.CancelledError:
                actions.append("SUPPRESSED")
                await asyncio.sleep(2)
                actions.append("DONE")
            return web.Response(text="FOO")

        t = None
        app = web.Application()
        app.cleanup_ctx.append(run_test)
        app.router.add_get("/", handler)
        app.router.add_get("/stop", self.stop)

        web.run_app(app, port=port, shutdown_timeout=2, handler_cancellation=True)
        assert t.exception() is None
        assert actions == ["CANCELLED", "SUPPRESSED", "PRESTOP", "STOPPING", "DONE"]