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Better Twisted reactor detection

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This commit is contained in:
Andrew Godwin 2018-02-04 12:18:44 -08:00
parent 0f8f731b2c
commit 826a8ce0de
1 changed files with 13 additions and 9 deletions
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22
daphne/server.py
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@ -2,15 +2,19 @@
import sys # isort:skip
import warnings # isort:skip
from twisted.internet import asyncioreactor # isort:skip
if "twisted.internet.reactor" in sys.modules:
warnings.warn(
"Something has already installed a Twisted reactor. Attempting to uninstall it; " +
"you can fix this warning by importing daphne.server early in your codebase or " +
"finding the package that imports Twisted and importing it later on.",
UserWarning,
)
del sys.modules["twisted.internet.reactor"]
asyncioreactor.install()
current_reactor = sys.modules.get("twisted.internet.reactor", None)
if current_reactor is not None:
if not isinstance(current_reactor, asyncioreactor.AsyncioSelectorReactor):
warnings.warn(
"Something has already installed a non-asyncio Twisted reactor. Attempting to uninstall it; " +
"you can fix this warning by importing daphne.server early in your codebase or " +
"finding the package that imports Twisted and importing it later on.",
UserWarning,
)
del sys.modules["twisted.internet.reactor"]
asyncioreactor.install()
else:
asyncioreactor.install()
import asyncio
import logging