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django / channels_redis

Redis channel layer backend for Django Channels

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FYI: New Relic Python instrumentation breaks the PubSub layer with async consumers

drewbrew opened this issue · comments

commented

There's nothing you can or should do here, but I just wanted to bring this bug to your attention (and anyone who may be googling why a 'coroutine' object has no attribute 'subscribed': newrelic/newrelic-python-agent#818

TLDR with this setup:

  • New Relic agent 8.6.0 to 8.8.0
  • Channels configured to use the Redis PubSub backend for the channel layer
  • Async consumers
  • Daphne serving websockets behind nginx

When you try to connect to the websocket, the client gets disconnected immediately because of an AttributeError in _do_receiving() at the lookup to self._pubsub.subscribed.

The workaround is to downgrade the New Relic agent to 8.5.0.

commented

Thanks for the post @drewbrew. That'll save a few folks a few cycles no doubt 👍