我最近将我的项目更新为Django 2和频道2.现在我正在尝试重写我的聊天应用测试。
我遇到了依赖于来自pytest-django的django db mark的测试问题。我尝试在WebsocketCommunicator上使用async_to_sync在测试函数本身中创建夹具，设置方法中的对象。但是，这些都没有奏效。
如果我在灯具中创建用户并正确保存，则获取ID。但是，在我的消费者中，Django没有在数据库中看到User。并像对待匿名用户一样对待它。
我有一个临时令牌，用于在websocket.connect上验证用户。
@pytest.fixture
def room():
room = generate_room()
room.save()
return room
@pytest.fixture
def room_with_user(room, normal_user):
room.users.add(normal_user)
yield room
room.users.remove(normal_user)
@pytest.fixture
def normal_user():
user = generate_user()
user.save()
return user
@pytest.mark.django_db
class TestConnect:
@pytest.mark.asyncio
async def test_get_connected_client(self, path, room_with_user, temp_token):
assert get_path(room_with_user.id) == path
communicator = QSWebsocketCommunicator(application, path, query_string=get_query_string(temp_token))
connected, subprotocol = await communicator.connect()
assert connected
await communicator.disconnect()
消费者：
class ChatConsumer(JsonWebsocketConsumer):
def connect(self):
# Called on connection. Either call
self.user = self.scope['user']
self.room_id = self.scope['url_route']['kwargs']['room_id']
group = f'room_{self.room_id}'
users = list(User.objects.all()) # no users here
self.group_name = group
if not (self.user is not None and self.user.is_authenticated):
return self.close({'Error': 'Not authenticated user'})
try:
self.room = Room.objects.get(id=self.room_id, users__id=self.user.id)
except ObjectDoesNotExist:
return self.close({'Error': 'Room does not exists'})
# Send success response
self.accept()
# Save user as active
self.room.active_users.add(self.user)
我的身份验证中间件
class OAuthTokenAuthMiddleware:
"""
Custom middleware that takes Authorization header and read OAuth token from it.
"""
def __init__(self, inner):
# Store the ASGI application we were passed
self.inner = inner
def __call__(self, scope):
temp_token = self.get_token(scope)
scope['user'] = self.validate_token(temp_token)
return self.inner(scope)
@staticmethod
def get_token(scope) -> str:
return url_parse.parse_qs(scope['query_string'])[b'token'][0].decode("utf-8")
@staticmethod
def validate_token(token):
try:
token = TemporaryToken.objects.select_related('user').get(token=token)
if token.is_active():
token.delete()
return token.user
else:
return AnonymousUser()
except ObjectDoesNotExist:
return AnonymousUser()
自定义WebsocketCommunicator，它接受query_string以包含我的一次性令牌
class QSWebsocketCommunicator(WebsocketCommunicator):
def __init__(self, application, path, headers=None, subprotocols=None,
query_string: Optional[Union[str, bytes]]=None):
if isinstance(query_string, str):
query_string = str.encode(query_string)
self.scope = {
"type": "websocket",
"path": path,
"headers": headers or [],
"subprotocols": subprotocols or [],
"query_string": query_string or ''
}
ApplicationCommunicator.__init__(self, application, self.scope)
我的问题是如何在测试/装置中创建User，Room等对象，以便我可以在Django使用者中访问它们。
或者你有另一个想法我怎么能克服这个？
答案 0 :(得分：4)
使用您提供的代码重现您的问题几乎是不可能的。阅读How to create a Minimal, Complete, and Verifiable example。但是，我认为您应该在测试中使用实际事务，因为普通pytest.mark.django_db将跳过事务而不是将任何数据本身存储在数据库中。一个工作的例子：
# routing.py
from django import http
from django.conf.urls import url
from django.contrib.auth.models import User
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.generic.websocket import JsonWebsocketConsumer
class ChatConsumer(JsonWebsocketConsumer):
def connect(self):
self.user = self.scope['user']
print('user in scope, set by middleware:', self.user)
users = list(User.objects.all()) # no users here
print('all users in chat consumer:', users)
if not (self.user is not None and self.user.is_authenticated):
return self.close({'Error': 'Not authenticated user'})
# Send success response
self.accept()
class OAuthTokenAuthMiddleware:
def __init__(self, inner):
# Store the ASGI application we were passed
self.inner = inner
def __call__(self, scope):
token = self.get_token(scope)
print('token in middleware:', token)
scope['user'] = User.objects.get(username=token)
return self.inner(scope)
@staticmethod
def get_token(scope) -> str:
d = http.QueryDict(scope['query_string'])
return d['token']
APP = ProtocolTypeRouter({
'websocket': OAuthTokenAuthMiddleware(URLRouter([url(r'^websocket/$', ChatConsumer)])),
})
使用用户名spam创建用户的示例工具：
@pytest.fixture(scope='function', autouse=True)
def create_user():
with transaction.atomic():
User.objects.all().delete()
user = User.objects.create_user(
'spam', 'spam@example.com', password='eggs',
first_name='foo', last_name='bar'
)
return user
现在，我将测试标记为事务性测试，这意味着每个查询都是实际提交的。现在，测试用户被存储到数据库中，并且在中间件/消费者中进行的查询实际上可以返回一些有意义的东西：
@pytest.mark.django_db(transaction=True)
@pytest.mark.asyncio
async def test_get_connected_client():
app = OAuthTokenAuthMiddleware(URLRouter([url(r'^websocket/$', ChatConsumer)]))
communicator = QSWebsocketCommunicator(app, '/websocket/', query_string='token=spam')
connected, subprotocol = await communicator.connect()
assert connected
await communicator.disconnect()
运行测试测试产生所需的结果：
$ pytest -vs
================================== test session starts =================================
platform darwin -- Python 3.6.3, pytest-3.4.0, py-1.5.2, pluggy-0.6.0 -- /Users/hoefling/.virtualenvs/stackoverflow/bin/python
cachedir: .pytest_cache
Django settings: spam.settings (from environment variable)
rootdir: /Users/hoefling/projects/private/stackoverflow/so-49136564/spam, inifile: pytest.ini
plugins: celery-4.1.0, forked-0.2, django-3.1.2, cov-2.5.1, asyncio-0.8.0, xdist-1.22.0, mock-1.6.3, hypothesis-3.44.4
collected 1 item
tests/test_middleware.py::test_get_connected_client Creating test database for alias 'default'...
token in middleware: spam
user in scope: spam
all users in chat consumer: [<User: spam>]
PASSEDDestroying test database for alias 'default'...
=============================== 1 passed in 0.38 seconds ================================
顺便说一句，您不再需要查看WebsocketCommunicator，因为它现在能够处理查询字符串，请参阅this issue closed。