Async Django 3.1 with aiohttp client - django

Question

Is it possible now, after the start of porting django to async to use aiohttp client with django?
My case:
server receives a request;
server sends another request to another server;
server decodes the response, saves it into DB, and returns that response to the client;
Andrew Svetlov mentioned that aiohttp "was never intended to work with synchronous WSGI" two years ago. (https://github.com/aio-libs/aiohttp/issues/3357)
But how the situation looks now? Django seems to almost support async views. Can we use aiohttp with asgi django?
I know, I can create an aiohttp server that handles requests, then populates some queue, and queue handler that saves responses into database, but here I am missing a lot from django: ORM, admin, etc.

Answer 1

You can implement thhis scenario in Django 3.1 like this:
async def my_proxy(request):
async with ClientSession() as session:
async with session.get('https://google.com') as resp:
print(resp.status)
print(await resp.text())
But the biggest question for me is how to share one session of aiohttp within django project because it is strongly not recommended to spawn a new ClientSession per request.
Important note:
Of course you should run your django application in ASGI mode with some compatible application server(for example uvicorn):
uvicorn my_project.asgi:application --reload
UPDATE: I found a workaround. You can create a module(file *.py) with shared global objects and populate it with ClientSession instance from project settings at project startup:
shared.py:
from typing import Optional
from aiohttp import ClientSession
AIOHTTP_SESSION: Optional[ClientSession] = None
settings.py:
from aiohttp import ClientSession
from my_project import shared
...
shared.AIOHTTP_SESSION = ClientSession()
views.py:
from my_project import shared
async def my_proxy(request):
async with shared.AIOHTTP_SESSION.get('https://google.com') as resp:
print(resp.status, resp._session)
await resp.text()
Important - imports should be EXACTLY the same. When i change them to form "from my_project.shared import AIOHTTP_SESSION" my test brakes :(
tests.py:
from asyncio import gather
from aiohttp import ClientSession
from django.test import TestCase
from my_project import shared
class ViewTests(TestCase):
async def test_async_view(self):
shared.AIOHTTP_SESSION = ClientSession()
await gather(*[self.async_client.get('/async_view_url') for _ in range(3)])
Run test by ./manage.py test