MySQL server gone away in Auth middleware

When I run django-channels after a when with daphne, I have found some error about auth middleware.

ERROR Exception inside application: (2006, 'MySQL server has gone away')

AND it failed at

File "/app/python/lib/python3.6/site-packages/channels/auth.py", line 27, in get_user

I have try to add database_sync_to_async to all the method needs to access to the username , and call close_connection in my own middleware before the auth middleware. But there still comes the error.

It is there a bug in auth middleware?What should I do to avoid this problem?

[heteddy]

the root cause is that django will close old connections(which closed by MySql) each request and response; while in django channels no request trigger close old connections then the database connection will be disconnected by MySQL, so we should do it by yourself;

#channels, before access database from django.db import close_old_connections close_old_connections

[andrewgodwin]

Yes, this is just the standard Django connection behaviour outside of requests, sorry! Not much we can do other than document it.