WSClient.update() fails on select.poll() when running in eventlet on Linux

[bobh66]

What happened (please include outputs or screenshots):

WSClient.update() was modified by PR kubernetes-client/python-base#268 to use select.poll() instead of select.select, which breaks when running under eventlet on Linux:

File "/usr/local/lib/python3.8/site-packages/kubernetes/stream/ws_client.py", line 182, in update
poll = select.poll()
AttributeError: module 'select' has no attribute 'poll'
module 'select' has no attribute 'poll'

eventlet monkey_patches the select module and does not support the poll() method

Adding a check on getattr(select, "poll", None) is None to the if statement and reverting to select.select when there is no poll attribute will fix the problem.

I'll push a PR

What you expected to happen:

No exception should occur

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Kubernetes version (kubectl version): 1.19, 1.21
• OS (e.g., MacOS 10.13.6): CentOS 7
• Python version (python --version) 3.8
• Python client version (pip list | grep kubernetes) 23.3.0

[bobh66]

/assign

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/lifecycle stale

[Akasurde]

/assign