Usage of udatetime causing CI failures for Exchange packs

[blag]

SUMMARY

The weekend CI tests for all 100+ StackStorm Exchange packs failed again this weekend:

#!/bin/bash
~/ci/.circle/test ; ~/ci/.circle/exit_on_py3_checks $?

Traceback (most recent call last):
  File "/home/circleci/ci/.circle/validate.py", line 21, in <module>
    from st2common.models.api.pack import PackAPI
  File "/tmp/st2/st2common/st2common/models/api/pack.py", line 24, in <module>
    from st2common import log as logging
  File "/tmp/st2/st2common/st2common/log.py", line 32, in <module>
    from st2common.logging.handlers import FormatNamedFileHandler
  File "/tmp/st2/st2common/st2common/logging/handlers.py", line 24, in <module>
    from st2common.util import date as date_utils
  File "/tmp/st2/st2common/st2common/util/date.py", line 24, in <module>
    import udatetime
  File "/home/circleci/virtualenv/lib/python3.6/site-packages/udatetime/__init__.py", line 20, in <module>
    from udatetime.rfc3339 import (
ImportError: /home/circleci/virtualenv/lib/python3.6/site-packages/udatetime/rfc3339.cpython-36m-x86_64-linux-gnu.so: undefined symbol: __exp_finite
Unable to retrieve pack name.
Original script exit code: 1

Exited with code exit status 1

CircleCI received exit code 1

I believe that this time it is related to this Debian issue where the udatetime library calls out to a C library, which does not properly link to the libm library, as detailed in freach/udatetime#30 and fixed in freach/udatetime#31, which is a miniscule, easy fix yet has been unmerged for over a year.

The udatetime package, introduced to StackStorm back in March in an attempt to optimize storage performance, has not been touched since 2018 and I believe that it's been abandoned. The author's blog has also not seen an update since 2018, and he hasn't posted anything to Twitter since 2018 either. His Xing profile does indicate that he has changed jobs multiple times since 2018 though.

I believe that the udatetime pack has been abandoned. We should consider offering to help maintain it, or we should move to a different library like ciso8601, which is actively maintained (as of this writing, the last release was on August 6th, 2021), and is also faster than udatetime, since performance was obviously a reason to select udatetime to begin with. @Kami Can we get your guidance here please?

STACKSTORM VERSION

StackStorm installed in CircleCI build container, cloned from the master branch:

git clone --depth 1 --single-branch --branch master https://github.com/StackStorm/st2.git /tmp/st2

OS, environment, install method

Ubuntu 18.04
Installed via git master branch, see log 1, and log 2.

Steps to reproduce the problem

Run pack tests in CircleCI.

Expected Results

I expected that udatetime would be importable and not cause issues, especially when the fix is literally a one-line fix that has been deployed in Debian for over a year.

Actual Results

All StackStorm Exchange weekend builds failed in CircleCI.

[Kami]

I'm fine with switching to ciso8601 or a similar alternative which is (actively) maintained and support.

In fact, as you said cisto8601, may even be better choice for multiple reasons.

1. Based on their benchmarks, it's faster
2. It supports ISO 8601 or RFC 3339 date strings. IIRC, udatetime only supports RFC 3339 so we have a catch-all fallback in case we try to parse date string udatetime doesn't directly support. Although that may not be 100% the case and we may still need a fallback, which is fine

Note: ciso8601 doesn't support the entirety of the ISO 8601 spec, only a popular subset

[amanda11]

We also need to switch as udatetime won't build for python 3.9 - freach/udatetime#32.

[nzlosh]

The switch to ciso8601 has been made #5692