add python 3.13 support

the logging.Handler class changed in 3.13 and will now always
try to acquire the lock in its `handle` method.

Removed the optimization that created the handler without a lock.

Also configure the CI to run on Python 3.13.

.github/workflows/ci.yaml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.12"
+          python-version: "3.13"
       - run: pip install -r requirements.txt
       - run: pre-commit run --all-files
       - run: mypy kopf --strict
@@ -38,10 +38,10 @@ jobs:
       fail-fast: false
       matrix:
         install-extras: [ "", "full-auth" ]
-        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12", "3.13" ]
         include:
           - install-extras: "uvloop"
-            python-version: "3.12"
+            python-version: "3.13"
     name: Python ${{ matrix.python-version }} ${{ matrix.install-extras }}
     runs-on: ubuntu-22.04
     timeout-minutes: 5  # usually 2-3 mins

kopf/_core/engines/posting.py

@@ -184,11 +184,6 @@ class K8sPoster(logging.Handler):
     A handler to post all log messages as K8s events.
     """
 
-    def createLock(self) -> None:
-        # Save some time on unneeded locks. Events are posted in the background.
-        # We only put events to the queue, which is already lock-protected.
-        self.lock = None
-
     def filter(self, record: logging.LogRecord) -> bool:
         # Only those which have a k8s object referred (see: `ObjectLogger`).
         # Otherwise, we have nothing to post, and nothing to do.

requirements.txt

@@ -21,5 +21,5 @@ pytest-asyncio
 pytest-cov
 pytest-mock
 pytest-timeout
-types-setuptools
 types-PyYAML
+types-setuptools

setup.py

@@ -38,6 +38,7 @@
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',

tests/peering/test_keepalive.py

@@ -1,8 +1,9 @@
+from itertools import chain, repeat
+from unittest import mock
+
 import pytest
 
 from kopf._core.engines.peering import keepalive
-from itertools import chain, repeat
-from unittest import mock
 
 
 class StopInfiniteCycleException(Exception):