django/core/checks/async_checks.py


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import os

from . import Error, Tags, register

E001 = Error(
    'You should not set the DJANGO_ALLOW_ASYNC_UNSAFE environment variable in '
    'deployment. This disables async safety protection.',
    id='async.E001',
)


@register(Tags.async_support, deploy=True)
def check_async_unsafe(app_configs, **kwargs):
    if os.environ.get('DJANGO_ALLOW_ASYNC_UNSAFE'):
        return [E001]
    return []