Support Python 3.14

[hmpf]

Scope and purpose

Fixes #1786

Blocked by pydantic depending on some rust stuff depending on cargo depending on lock-file formats.

Test and run on Python 3.14.

Depends on #1724

This pull request

• adds/changes/removes a dependency

Contributor Checklist

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• Added a changelog fragment for towncrier
• [ ] Added/amended tests for new/changed code
• Added/changed documentation, including updates to the user manual if feature flow or UI is considerably changed
• [ ] Linted/formatted the code with ruff and djLint, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See our how-to
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done
• [ ] If this results in changes in the UI: Added screenshots of the before and after
• [ ] If this results in changes to the database model: Updated the ER diagram

[github-actions]

Test results

    8 files  1 584 suites   2m 43s ⏱️
  866 tests   865 ✅ 1 💤 0 ❌
6 928 runs  6 920 ✅ 8 💤 0 ❌

Results for commit 75a04b5.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.56%. Comparing base (61d2790) to head (9e42515).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1725   +/-   ##
=======================================
  Coverage   88.55%   88.56%           
=======================================
  Files         145      145           
  Lines        7061     7064    +3     
=======================================
+ Hits         6253     6256    +3     
  Misses        808      808           

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[hmpf]

This fails on:

Traceback (most recent call last):
  File "CENSORED/Argus/tests/dev/test_utils.py", line 11, in setUp
    self.stresstester = StressTester("http://localhost.com", "token", 10, 1)
                        ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "CENSORED/Argus/src/argus/dev/utils.py", line 36, in __init__
    self._loop = asyncio.get_event_loop()
                 ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/asyncio/events.py", line 715, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
                       % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'MainThread'.

Your code, @stveit. I looked for solutions and found this:

• https://stackoverflow.com/questions/71505309/runtimeerror-there-is-no-current-event-loop-in-thread-mainthread
• https://bobbyhadz.com/blog/deprecationwarning-there-is-no-current-event-loop

[hmpf]

Finishing this is blocked because:

There's problems with the direct dependency pydantic on python 3.14. pydantic needs rpds which is a rust crate:

  × Preparing metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [10 lines of output]
      error: failed to parse lock file at: /tmp/pip-install-nl5ky0_r/rpds-py_0d5a219ec1dd4f848c74cefed920a494/Cargo.lock
      
      Caused by:
        lock file version `4` was found, but this version of Cargo does not understand this lock file, perhaps Cargo needs to be updated?
      💥 maturin failed
        Caused by: Cargo metadata failed. Does your crate compile with `cargo build`?
        Caused by: `cargo metadata` exited with an error:
      Error running maturin: Command '['maturin', 'pep517', 'write-dist-info', '--metadata-directory', '/tmp/pip-modern-metadata-j0t4zoi_', '--interpreter', 'CENSORED/Argus/.tox/py314-django52/bin/python']' returned non-zero exit status 1.
      Checking for Rust toolchain....
      Running `maturin pep517 write-dist-info --metadata-directory /tmp/pip-modern-metadata-j0t4zoi_ --interpreter CENSORED/Argus/.tox/py314-django52/bin/python`
      [end of output]

It seems only argus depends on pydantic so worst case we could try switching to cattrs.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[lunkwill42]

Looks green to me 👍

[lunkwill42]

Blocked by pydantic depending on some rust stuff depending on cargo depending on lock-file formats.

Yes, pydantic is partially built in rust for speed. The problem was likely pip-compile's conservative nature, trying to preserve existing pins from the lockfile. This caused it to keep running on an older version of pydantic-core which had no published binary wheels for Python 3.14. Upgrading the library to a newer version gave us access to the pre-built wheels and voila, no rust compiler needed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud