Django Error: (2013, 'Lost connection to MySQL server during query') after running for "mysql wait_timeout" second

In order to recreate this bug，i set mysql wait_timeout=10 and interactive_timeou=10 .

run server :

uvicorn mweb.asgi:application --host 0.0.0.0 --port 8000 --ws wsproto  --debug   

after 10s connect websocket，

ERROR: Exception in ASGI application
Traceback (most recent call last):
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 250, in execute
    self.errorhandler(self, exc, value)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 247, in execute
    res = self._query(query)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 412, in _query
    rowcount = self._do_query(q)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 375, in _do_query
    db.query(q)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/connections.py", line 276, in query
    _mysql.connection.query(self, query)
_mysql_exceptions.OperationalError: (2013, 'Lost connection to MySQL server during query')

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/uvicorn/protocols/websockets/wsproto_impl.py", line 190, in run_asgi
    asgi = self.app(self.scope)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/uvicorn/middleware/debug.py", line 66, in __call__
    return self.app(scope)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/routing.py", line 58, in __call__
    return self.application_mapping[scope["type"]](scope)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/sessions.py", line 43, in __call__
    return self.inner(dict(scope, cookies=cookies))
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/sessions.py", line 141, in __call__
    return SessionMiddlewareInstance(scope, self)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/sessions.py", line 165, in __init__
    self.inner = self.middleware.inner(self.scope)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/middleware.py", line 31, in __call__
    inner_instance = self.inner(scope)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/routing.py", line 144, in __call__
    "kwargs": {**outer.get("kwargs", {}), **kwargs},
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/channels/routing.py", line 144, in __call__
    "kwargs": {**outer.get("kwargs", {}), **kwargs},
  File "./sales_ai_coach/base/consumer_base.py", line 100, in __init__
    u=User.objects.get(id=153)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/models/query.py", line 393, in get
    num = len(clone)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/models/query.py", line 250, in __len__
    self._fetch_all()
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/models/query.py", line 1186, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/models/query.py", line 54, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1065, in execute_sql
    cursor.execute(sql, params)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 250, in execute
    self.errorhandler(self, exc, value)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 247, in execute
    res = self._query(query)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 412, in _query
    rowcount = self._do_query(q)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/cursors.py", line 375, in _do_query
    db.query(q)
  File "/Users/xx/project/py3.6/lib/python3.6/site-packages/MySQLdb/connections.py", line 276, in query
    _mysql.connection.query(self, query)
django.db.utils.OperationalError: (2013, 'Lost connection to MySQL server during query')

but http work fine.

Django==2.1.3
channels==2.1.5
channels_redis==2.3.1
uvicorn==0.4.1
wsproto==0.12.0

[abersheeran]

@MahmoudHigazy Any file that will be imported. I added it in settings.py.

[MahmoudHigazy]

May be you can try https://aber.sh/articles/Django-automatic-reconnect/

import importlib

from django.conf import settings
from django.db.backends.utils import CursorWrapper


for name, config in settings.DATABASES.items():
    module = importlib.import_module(config["ENGINE"] + ".base")

    def ensure_connection(self):
        if self.connection is not None:
            try:
                with CursorWrapper(self.create_cursor(), self) as cursor:
                    cursor.execute("SELECT 1")
                return
            except Exception:
                pass

        with self.wrap_database_errors:
            self.connect()

    module.DatabaseWrapper.ensure_connection = ensure_connection

where should I add this code?