urllib3 and OpenSSL

[keceli]

Following the Balsam installation instructions:

$ /soft/datascience/create_env.sh my-env # Or DIY
$ source my-env/bin/activate
$ pip install --pre balsam

gives the following error on Theta:

Traceback (most recent call last):
  File "/lus/swift/home/keceli/balsam-env/bin/balsam", line 5, in <module>
    from balsam.cmdline import main
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/balsam/cmdline/__init__.py", line 10, in <module>
    from balsam.cmdline import app, job, login, scheduler, site
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/balsam/cmdline/app.py", line 4, in <module>
    from balsam.config import ClientSettings
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/balsam/config/__init__.py", line 1, in <module>
    from .config import ClientSettings, InvalidSettings, Settings, SiteConfig, balsam_home
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/balsam/config/config.py", line 14, in <module>
    from balsam.client import NotAuthenticatedError, RequestsClient
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/balsam/client/__init__.py", line 4, in <module>
    from .requests_client import NotAuthenticatedError, RequestsClient
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/balsam/client/requests_client.py", line 9, in <module>
    import requests
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/requests/__init__.py", line 43, in <module>
    import urllib3
  File "/lus/swift/home/keceli/balsam-env/lib/python3.8/site-packages/urllib3/__init__.py", line 41, in <module>
    raise ImportError(
ImportError: urllib3 v2.0 only supports OpenSSL 1.1.1+, currently the 'ssl' module is compiled with 'OpenSSL 1.1.0i-fips  14 Aug 2018'. See: https://github.com/urllib3/urllib3/issues/2168

As noted in the error, this is due to an external dependency (urllib3) dropping support for OpenSSL < 1.1.1. One can fix the issue by installing an earlier version of urllib3, i.e. pip install urllib3==1.26.7 worked for me.