Merge branch 'main' into master

.github/workflows/pre-commit.yml

@@ -0,0 +1,24 @@
+name: pre-commit
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - uses: pre-commit/action@v2.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yml

@@ -0,0 +1,35 @@
+name: Tests
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+        - 3.6
+        - 3.7
+        - 3.8
+        - 3.9
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install --upgrade tox tox-py
+
+      - name: Run tox targets for ${{ matrix.python-version }}
+        run: tox --py current

.pre-commit-config.yaml

@@ -0,0 +1,21 @@
+repos:
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.11.0
+    hooks:
+      - id: pyupgrade
+        args: [--py36-plus]
+  - repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+        language_version: python3
+  - repo: https://github.com/pycqa/isort
+    rev: 5.8.0
+    hooks:
+      - id: isort
+  - repo: https://github.com/PyCQA/flake8
+    rev: 3.9.0
+    hooks:
+      - id: flake8
+        additional_dependencies:
+          - flake8-bugbear

.travis.yml

@@ -1,48 +0,0 @@
-sudo: false
-
-language: python
-
-python:
-- '3.8'
-- '3.7'
-- '3.6'
-- '3.5'
-
-env:
-- TWISTED="twisted"
-- TWISTED="twisted==18.7.0"
-
-install:
-- pip install $TWISTED -e .[tests]
-- pip freeze
-
-script:
-- pytest
-
-stages:
-  - lint
-  - test
-  - name: release
-    if: tag IS present
-
-jobs:
-  include:
-    - stage: lint
-      python: 3.6
-      install: pip install -U -e .[tests] black pyflakes isort
-      script:
-        - pyflakes daphne tests
-        - black --check daphne tests
-        - isort --check-only --diff --recursive daphne tests
-
-    - stage: release
-      python: 3.6
-      script: skip
-      deploy:
-        provider: pypi
-        user: andrewgodwin_bot
-        on:
-          tags: true
-        distributions: sdist bdist_wheel
-        password:
-          secure: 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

CHANGELOG.txt

@@ -1,3 +1,33 @@
+3.0.2 (2021-04-07)
+------------------
+
+* Fixed a bug where ``send`` passed to applications wasn't a true async
+  function but a lambda wrapper, preventing it from being used with
+  ``asgiref.sync.async_to_sync()``.
+
+
+3.0.1 (2020-11-12)
+------------------
+
+* Fixed a bug where ``asyncio.CancelledError`` was not correctly handled on
+  Python 3.8+, resulting in incorrect protocol application cleanup.
+
+
+3.0.0 (2020-10-28)
+------------------
+
+* Updates internals to use ASGI v3 throughout. ``asgiref.compatibility`` is
+  used for older applications.
+
+* Consequently, the `--asgi-protocol` command-line option is removed.
+
+* HTTP request bodies are now read, and passed to the application, in chunks.
+
+* Added support for Python 3.9.
+
+* Dropped support for Python 3.5.
+
+
 2.5.0 (2020-04-15)
 ------------------
 
@@ -9,6 +39,7 @@
   ``lock`` argument to ``__init__()``. This is expected to be an instance of
   ``multiprocessing.Lock``.
 
+
 2.4.1 (2019-12-18)
 ------------------
 
@@ -16,6 +47,7 @@
   3.0's ``async_unsafe()`` decorator in threaded contexts, such as using the
   auto-reloader.
 
+
 2.4.0 (2019-11-20)
 ------------------
 
@@ -33,11 +65,13 @@
 
 * Adds missing LICENSE to distribution.
 
+
 2.3.0 (2019-04-09)
 ------------------
 
 * Added support for ASGI v3.
 
+
 2.2.5 (2019-01-31)
 ------------------
 

README.rst

@@ -1,24 +1,17 @@
 daphne
 ======
 
-.. image:: https://api.travis-ci.org/django/daphne.svg
-    :target: https://travis-ci.org/django/daphne
-
 .. image:: https://img.shields.io/pypi/v/daphne.svg
     :target: https://pypi.python.org/pypi/daphne
 
 Daphne is a HTTP, HTTP2 and WebSocket protocol server for
-`ASGI <https://github.com/django/asgiref/blob/master/specs/asgi.rst>`_ and
-`ASGI-HTTP <https://github.com/django/asgiref/blob/master/specs/www.rst>`_,
+`ASGI <https://github.com/django/asgiref/blob/main/specs/asgi.rst>`_ and
+`ASGI-HTTP <https://github.com/django/asgiref/blob/main/specs/www.rst>`_,
 developed to power Django Channels.
 
 It supports automatic negotiation of protocols; there's no need for URL
 prefixing to determine WebSocket endpoints versus HTTP endpoints.
 
-*Note:* Daphne 2 is not compatible with Channels 1.x applications, only with
-Channels 2.x and other ASGI applications. Install a 1.x version of Daphne
-for Channels 1.x support.
-
 
 Running
 -------
@@ -61,7 +54,7 @@ Daphne supports terminating HTTP/2 connections natively. You'll
 need to do a couple of things to get it working, though. First, you need to
 make sure you install the Twisted ``http2`` and ``tls`` extras::
 
-    pip install -U Twisted[tls,http2]
+    pip install -U 'Twisted[tls,http2]'
 
 Next, because all current browsers only support HTTP/2 when using TLS, you will
 need to start Daphne with TLS turned on, which can be done using the Twisted endpoint syntax::
@@ -115,19 +108,19 @@ should start with a slash, but not end with one; for example::
 Python Support
 --------------
 
-Daphne requires Python 3.5 or later.
+Daphne requires Python 3.6 or later.
 
 
 Contributing
 ------------
 
 Please refer to the
-`main Channels contributing docs <https://github.com/django/channels/blob/master/CONTRIBUTING.rst>`_.
+`main Channels contributing docs <https://github.com/django/channels/blob/main/CONTRIBUTING.rst>`_.
 
 To run tests, make sure you have installed the ``tests`` extra with the package::
 
     cd daphne/
-    pip install -e .[tests]
+    pip install -e '.[tests]'
     pytest
 
 
@@ -141,4 +134,4 @@ https://docs.djangoproject.com/en/dev/internals/security/.
 To report bugs or request new features, please open a new GitHub issue.
 
 This repository is part of the Channels project. For the shepherd and maintenance team, please see the
-`main Channels readme <https://github.com/django/channels/blob/master/README.rst>`_.
+`main Channels readme <https://github.com/django/channels/blob/main/README.rst>`_.

daphne/__init__.py

@@ -1,6 +1,6 @@
 import sys
 
-__version__ = "2.5.0"
+__version__ = "3.0.2"
 
 
 # Windows on Python 3.8+ uses ProactorEventLoop, which is not compatible with

daphne/__main__.py

@@ -0,0 +1,3 @@
+from daphne.cli import CommandLineInterface
+
+CommandLineInterface.entrypoint()

daphne/access.py

@@ -1,7 +1,7 @@
 import datetime
 
 
-class AccessLogGenerator(object):
+class AccessLogGenerator:
     """
     Object that implements the Daphne "action logger" internal interface in
     order to provide an access log in something resembling NCSA format.

daphne/cli.py

@@ -1,10 +1,9 @@
 import argparse
-import functools
 import logging
 import sys
 from argparse import ArgumentError, Namespace
 
-from asgiref.compatibility import is_double_callable
+from asgiref.compatibility import guarantee_single_callable
 
 from .access import AccessLogGenerator
 from .endpoints import build_endpoint_description_strings
@@ -17,20 +16,7 @@ DEFAULT_HOST = "127.0.0.1"
 DEFAULT_PORT = 8000
 
 
-class ASGI3Middleware:
-    def __init__(self, app):
-        self.app = app
-
-    def __call__(self, scope):
-        scope.setdefault("asgi", {})
-        scope["asgi"]["version"] = "3.0"
-        return functools.partial(self.asgi, scope=scope)
-
-    async def asgi(self, receive, send, scope):
-        await self.app(scope, receive, send)
-
-
-class CommandLineInterface(object):
+class CommandLineInterface:
     """
     Acts as the main CLI entry point for running the server.
     """
@@ -129,13 +115,6 @@ class CommandLineInterface(object):
             help="The WebSocket protocols you wish to support",
             default=None,
         )
-        self.parser.add_argument(
-            "--asgi-protocol",
-            dest="asgi_protocol",
-            help="The version of the ASGI protocol to use",
-            default="auto",
-            choices=["asgi2", "asgi3", "auto"],
-        )
         self.parser.add_argument(
             "--root-path",
             dest="root_path",
@@ -247,16 +226,11 @@ class CommandLineInterface(object):
                 access_log_stream = open(args.access_log, "a", 1)
         elif args.verbosity >= 1:
             access_log_stream = sys.stdout
+
         # Import application
         sys.path.insert(0, ".")
         application = import_by_path(args.application)
-
-        asgi_protocol = args.asgi_protocol
-        if asgi_protocol == "auto":
-            asgi_protocol = "asgi2" if is_double_callable(application) else "asgi3"
-
-        if asgi_protocol == "asgi3":
-            application = ASGI3Middleware(application)
+        application = guarantee_single_callable(application)
 
         # Set up port/host bindings
         if not any(
@@ -284,7 +258,7 @@ class CommandLineInterface(object):
         )
         endpoints = sorted(args.socket_strings + endpoints)
         # Start the server
-        logger.info("Starting server at %s" % (", ".join(endpoints),))
+        logger.info("Starting server at {}".format(", ".join(endpoints)))
         self.server = self.server_class(
             application=application,
             endpoints=endpoints,

daphne/http_protocol.py

@@ -185,9 +185,19 @@ class WebRequest(http.Request):
                     # Not much we can do, the request is prematurely abandoned.
                     return
                 # Run application against request
-                self.application_queue.put_nowait(
-                    {"type": "http.request", "body": self.content.read()}
-                )
+                buffer_size = self.server.request_buffer_size
+                while True:
+                    chunk = self.content.read(buffer_size)
+                    more_body = not (len(chunk) < buffer_size)
+                    payload = {
+                        "type": "http.request",
+                        "body": chunk,
+                        "more_body": more_body,
+                    }
+                    self.application_queue.put_nowait(payload)
+                    if not more_body:
+                        break
+
         except Exception:
             logger.error(traceback.format_exc())
             self.basic_error(

daphne/server.py

@@ -22,6 +22,7 @@ else:
 import logging
 import time
 from concurrent.futures import CancelledError
+from functools import partial
 
 from autobahn.websocket.compress import PERMESSAGE_COMPRESSION_EXTENSION as EXTENSIONS
 from twisted.internet import defer, reactor
@@ -35,7 +36,7 @@ from .ws_protocol import WebSocketFactory
 logger = logging.getLogger(__name__)
 
 
-class Server(object):
+class Server:
     def __init__(
         self,
         application,
@@ -43,6 +44,7 @@ class Server(object):
         signal_handlers=True,
         action_logger=None,
         http_timeout=None,
+        request_buffer_size=8192,
         websocket_timeout=86400,
         websocket_connect_timeout=20,
         websocket_permessage_compression_extensions=[
@@ -73,6 +75,7 @@ class Server(object):
         self.http_timeout = http_timeout
         self.ping_interval = ping_interval
         self.ping_timeout = ping_timeout
+        self.request_buffer_size = request_buffer_size
         self.proxy_forwarded_address_header = proxy_forwarded_address_header
         self.proxy_forwarded_port_header = proxy_forwarded_port_header
         self.proxy_forwarded_proto_header = proxy_forwarded_proto_header
@@ -207,15 +210,17 @@ class Server(object):
         assert "application_instance" not in self.connections[protocol]
         # Make an instance of the application
         input_queue = asyncio.Queue()
-        application_instance = self.application(scope=scope)
+        scope.setdefault("asgi", {"version": "3.0"})
+        application_instance = self.application(
+            scope=scope,
+            receive=input_queue.get,
+            send=partial(self.handle_reply, protocol),
+        )
         # Run it, and stash the future for later checking
         if protocol not in self.connections:
             return None
         self.connections[protocol]["application_instance"] = asyncio.ensure_future(
-            application_instance(
-                receive=input_queue.get,
-                send=lambda message: self.handle_reply(protocol, message),
-            ),
+            application_instance,
             loop=asyncio.get_event_loop(),
         )
         return input_queue
@@ -298,7 +303,7 @@ class Server(object):
             if application_instance and application_instance.done():
                 try:
                     exception = application_instance.exception()
-                except CancelledError:
+                except (CancelledError, asyncio.CancelledError):
                     # Future cancellation. We can ignore this.
                     pass
                 else:

daphne/testing.py

@@ -5,10 +5,9 @@ import pickle
 import tempfile
 import traceback
 from concurrent.futures import CancelledError
-from functools import partial
 
 
-class DaphneTestingInstance:
+class BaseDaphneTestingInstance:
     """
     Launches an instance of Daphne in a subprocess, with a host and port
     attribute allowing you to call it.
@@ -18,18 +17,20 @@ class DaphneTestingInstance:
 
     startup_timeout = 2
 
-    def __init__(self, xff=False, http_timeout=None):
+    def __init__(
+        self, xff=False, http_timeout=None, request_buffer_size=None, *, application
+    ):
         self.xff = xff
         self.http_timeout = http_timeout
         self.host = "127.0.0.1"
-        self.lock = multiprocessing.Lock()
+        self.request_buffer_size = request_buffer_size
+        self.application = application
 
     def __enter__(self):
-        # Clear result storage
-        TestApplication.delete_setup()
-        TestApplication.delete_result()
         # Option Daphne features
         kwargs = {}
+        if self.request_buffer_size:
+            kwargs["request_buffer_size"] = self.request_buffer_size
         # Optionally enable X-Forwarded-For support.
         if self.xff:
             kwargs["proxy_forwarded_address_header"] = "X-Forwarded-For"
@@ -40,7 +41,7 @@ class DaphneTestingInstance:
         # Start up process
         self.process = DaphneProcess(
             host=self.host,
-            application=partial(TestApplication, lock=self.lock),
+            application=self.application,
             kwargs=kwargs,
             setup=self.process_setup,
             teardown=self.process_teardown,
@@ -74,6 +75,21 @@ class DaphneTestingInstance:
         """
         pass
 
+    def get_received(self):
+        pass
+
+
+class DaphneTestingInstance(BaseDaphneTestingInstance):
+    def __init__(self, *args, **kwargs):
+        self.lock = multiprocessing.Lock()
+        super().__init__(*args, **kwargs, application=TestApplication(lock=self.lock))
+
+    def __enter__(self):
+        # Clear result storage
+        TestApplication.delete_setup()
+        TestApplication.delete_result()
+        return super().__enter__()
+
     def get_received(self):
         """
         Returns the scope and messages the test application has received
@@ -147,7 +163,7 @@ class DaphneProcess(multiprocessing.Process):
                 self.server.run()
             finally:
                 self.teardown()
-        except Exception as e:
+        except BaseException as e:
             # Put the error on our queue so the parent gets it
             self.errors.put((e, traceback.format_exc()))
 
@@ -170,12 +186,12 @@ class TestApplication:
     setup_storage = os.path.join(tempfile.gettempdir(), "setup.testio")
     result_storage = os.path.join(tempfile.gettempdir(), "result.testio")
 
-    def __init__(self, scope, lock):
-        self.scope = scope
+    def __init__(self, lock):
         self.lock = lock
         self.messages = []
 
-    async def __call__(self, send, receive):
+    async def __call__(self, scope, receive, send):
+        self.scope = scope
         # Receive input and send output
         logging.debug("test app coroutine alive")
         try:

daphne/twisted/plugins/fd_endpoint.py

@@ -7,7 +7,7 @@ from zope.interface import implementer
 
 
 @implementer(IPlugin, IStreamServerEndpointStringParser)
-class _FDParser(object):
+class _FDParser:
     prefix = "fd"
 
     def _parseServer(self, reactor, fileno, domain=socket.AF_INET):

daphne/ws_protocol.py

@@ -304,7 +304,7 @@ class WebSocketProtocol(WebSocketServerProtocol):
         return id(self) == id(other)
 
     def __repr__(self):
-        return "<WebSocketProtocol client=%r path=%r>" % (self.client_addr, self.path)
+        return f"<WebSocketProtocol client={self.client_addr!r} path={self.path!r}>"
 
 
 class WebSocketFactory(WebSocketServerFactory):
@@ -325,7 +325,7 @@ class WebSocketFactory(WebSocketServerFactory):
         Builds protocol instances. We use this to inject the factory object into the protocol.
         """
         try:
-            protocol = super(WebSocketFactory, self).buildProtocol(addr)
+            protocol = super().buildProtocol(addr)
             protocol.factory = self
             return protocol
         except Exception:

setup.cfg

@@ -1,16 +1,10 @@
-[bdist_wheel]
-universal=1
-
-[tool:pytest]
-addopts = tests/
-
-[isort]
-include_trailing_comma = True
-multi_line_output = 3
-known_first_party = channels,daphne,asgiref,channels_redis
-line_length = 88
-
 [flake8]
 exclude = venv/*,tox/*,docs/*,testproject/*,js_client/*,.eggs/*
-ignore = E123,E128,E266,E402,W503,E731,W601
+extend-ignore = E123, E128, E266, E402, W503, E731, W601
 max-line-length = 120
+
+[isort]
+profile = black
+
+[tool:pytest]
+testpaths = tests

setup.py

@@ -22,7 +22,8 @@ setup(
     package_dir={"twisted": "daphne/twisted"},
     packages=find_packages() + ["twisted.plugins"],
     include_package_data=True,
-    install_requires=["twisted[tls]>=18.7", "autobahn>=0.18", "asgiref~=3.2"],
+    install_requires=["twisted[tls]>=18.7", "autobahn>=0.18", "asgiref>=3.2.10,<4"],
+    python_requires=">=3.6",
     setup_requires=["pytest-runner"],
     extras_require={
         "tests": ["hypothesis==4.23", "pytest~=3.10", "pytest-asyncio~=0.8"]
@@ -38,10 +39,10 @@ setup(
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Topic :: Internet :: WWW/HTTP",
     ],
 )

tests/http_base.py

@@ -20,13 +20,24 @@ class DaphneTestCase(unittest.TestCase):
     ### Plain HTTP helpers
 
     def run_daphne_http(
-        self, method, path, params, body, responses, headers=None, timeout=1, xff=False
+        self,
+        method,
+        path,
+        params,
+        body,
+        responses,
+        headers=None,
+        timeout=1,
+        xff=False,
+        request_buffer_size=None,
     ):
         """
         Runs Daphne with the given request callback (given the base URL)
         and response messages.
         """
-        with DaphneTestingInstance(xff=xff) as test_app:
+        with DaphneTestingInstance(
+            xff=xff, request_buffer_size=request_buffer_size
+        ) as test_app:
             # Add the response messages
             test_app.add_send_messages(responses)
             # Send it the request. We have to do this the long way to allow
@@ -79,7 +90,14 @@ class DaphneTestCase(unittest.TestCase):
                 )
 
     def run_daphne_request(
-        self, method, path, params=None, body=None, headers=None, xff=False
+        self,
+        method,
+        path,
+        params=None,
+        body=None,
+        headers=None,
+        xff=False,
+        request_buffer_size=None,
     ):
         """
         Convenience method for just testing request handling.
@@ -92,6 +110,7 @@ class DaphneTestCase(unittest.TestCase):
             body=body,
             headers=headers,
             xff=xff,
+            request_buffer_size=request_buffer_size,
             responses=[
                 {"type": "http.response.start", "status": 200},
                 {"type": "http.response.body", "body": b"OK"},
@@ -163,7 +182,7 @@ class DaphneTestCase(unittest.TestCase):
         if response.status != 101:
             raise RuntimeError("WebSocket upgrade did not result in status code 101")
         # Prepare headers for subprotocol searching
-        response_headers = dict((n.lower(), v) for n, v in response.getheaders())
+        response_headers = {n.lower(): v for n, v in response.getheaders()}
         response.read()
         assert not response.closed
         # Return the raw socket and any subprotocol
@@ -233,7 +252,7 @@ class DaphneTestCase(unittest.TestCase):
         """
         try:
             socket.inet_aton(address)
-        except socket.error:
+        except OSError:
             self.fail("'%s' is not a valid IP address." % address)
 
     def assert_key_sets(self, required_keys, optional_keys, actual_keys):

tests/test_cli.py

@@ -1,5 +1,3 @@
-# coding: utf8
-
 import logging
 from argparse import ArgumentError
 from unittest import TestCase

tests/test_http_request.py

@@ -1,11 +1,10 @@
-# coding: utf8
-
 import collections
 from urllib import parse
 
 import http_strategies
 from http_base import DaphneTestCase
 from hypothesis import assume, given, settings
+from hypothesis.strategies import integers
 
 
 class TestHTTPRequest(DaphneTestCase):
@@ -23,6 +22,7 @@ class TestHTTPRequest(DaphneTestCase):
         # Check overall keys
         self.assert_key_sets(
             required_keys={
+                "asgi",
                 "type",
                 "http_version",
                 "method",
@@ -34,6 +34,7 @@ class TestHTTPRequest(DaphneTestCase):
             optional_keys={"scheme", "root_path", "client", "server"},
             actual_keys=scope.keys(),
         )
+        self.assertEqual(scope["asgi"]["version"], "3.0")
         # Check that it is the right type
         self.assertEqual(scope["type"], "http")
         # Method (uppercased unicode string)
@@ -119,6 +120,26 @@ class TestHTTPRequest(DaphneTestCase):
         self.assert_valid_http_scope(scope, "GET", request_path, params=request_params)
         self.assert_valid_http_request_message(messages[0], body=b"")
 
+    @given(request_path=http_strategies.http_path(), chunk_size=integers(min_value=1))
+    @settings(max_examples=5, deadline=5000)
+    def test_request_body_chunking(self, request_path, chunk_size):
+        """
+        Tests request body chunking logic.
+        """
+        body = b"The quick brown fox jumps over the lazy dog"
+        _, messages = self.run_daphne_request(
+            "POST",
+            request_path,
+            body=body,
+            request_buffer_size=chunk_size,
+        )
+
+        # Avoid running those asserts when there's a single "http.disconnect"
+        if len(messages) > 1:
+            assert messages[0]["body"].decode() == body.decode()[:chunk_size]
+            assert not messages[-2]["more_body"]
+            assert messages[-1] == {"type": "http.disconnect"}
+
     @given(
         request_path=http_strategies.http_path(),
         request_body=http_strategies.http_body(),

tests/test_http_response.py

@@ -1,5 +1,3 @@
-# coding: utf8
-
 import http_strategies
 from http_base import DaphneTestCase
 from hypothesis import given, settings

tests/test_utils.py

@@ -1,5 +1,3 @@
-# coding: utf8
-
 from unittest import TestCase
 
 from twisted.web.http_headers import Headers

tests/test_websocket.py

@@ -1,5 +1,3 @@
-# coding: utf8
-
 import collections
 import time
 from urllib import parse
@@ -8,6 +6,8 @@ import http_strategies
 from http_base import DaphneTestCase, DaphneTestingInstance
 from hypothesis import given, settings
 
+from daphne.testing import BaseDaphneTestingInstance
+
 
 class TestWebsocket(DaphneTestCase):
     """
@@ -23,10 +23,18 @@ class TestWebsocket(DaphneTestCase):
         """
         # Check overall keys
         self.assert_key_sets(
-            required_keys={"type", "path", "raw_path", "query_string", "headers"},
+            required_keys={
+                "asgi",
+                "type",
+                "path",
+                "raw_path",
+                "query_string",
+                "headers",
+            },
             optional_keys={"scheme", "root_path", "client", "server", "subprotocols"},
             actual_keys=scope.keys(),
         )
+        self.assertEqual(scope["asgi"]["version"], "3.0")
         # Check that it is the right type
         self.assertEqual(scope["type"], "websocket")
         # Path
@@ -307,3 +315,54 @@ class TestWebsocket(DaphneTestCase):
             self.websocket_send_frame(sock, "still alive?")
             # Receive a frame and make sure it's correct
             assert self.websocket_receive_frame(sock) == "cake"
+
+    def test_application_checker_handles_asyncio_cancellederror(self):
+        with CancellingTestingInstance() as app:
+            # Connect to the websocket app, it will immediately raise
+            # asyncio.CancelledError
+            sock, _ = self.websocket_handshake(app)
+            # Disconnect from the socket
+            sock.close()
+            # Wait for application_checker to clean up the applications for
+            # disconnected clients, and for the server to be stopped.
+            time.sleep(3)
+            # Make sure we received either no error, or a ConnectionsNotEmpty
+            while not app.process.errors.empty():
+                err, _tb = app.process.errors.get()
+                if not isinstance(err, ConnectionsNotEmpty):
+                    raise err
+                self.fail(
+                    "Server connections were not cleaned up after an asyncio.CancelledError was raised"
+                )
+
+
+async def cancelling_application(scope, receive, send):
+    import asyncio
+
+    from twisted.internet import reactor
+
+    # Stop the server after a short delay so that the teardown is run.
+    reactor.callLater(2, lambda: reactor.stop())
+    await send({"type": "websocket.accept"})
+    raise asyncio.CancelledError()
+
+
+class ConnectionsNotEmpty(Exception):
+    pass
+
+
+class CancellingTestingInstance(BaseDaphneTestingInstance):
+    def __init__(self):
+        super().__init__(application=cancelling_application)
+
+    def process_teardown(self):
+        import multiprocessing
+
+        # Get a hold of the enclosing DaphneProcess (we're currently running in
+        # the same process as the application).
+        proc = multiprocessing.current_process()
+        # By now the (only) socket should have disconnected, and the
+        # application_checker should have run. If there are any connections
+        # still, it means that the application_checker did not clean them up.
+        if proc.server.connections:
+            raise ConnectionsNotEmpty()

tox.ini

@@ -0,0 +1,12 @@
+[tox]
+envlist =
+    py{36,37,38,39}-twisted{187,latest}
+
+[testenv]
+usedevelop = true
+extras = tests
+commands =
+    pytest -v {posargs}
+deps =
+    twisted187: twisted==18.7.0
+    twistedlatest: twisted>=20.3.0