Python 3.13 support

[xrmx]

Python 3.13 raises an exception with how we buffer things to send to the apm server. When the gzip object is closed it raises an exception because the BytesIO used as its backing storage is already gone.

Filed an upstream issue python/cpython#129726 so waiting for some feedback here before reworking our code.

[Maksych]

How to produce this ignored exception:

import elasticapm

elasticapm.Client({})

Then got output:

No custom SERVICE_NAME was set -- using non-descript default 'unknown-python-service'
Could not register elasticapm.metrics.sets.cpu.CPUMetricSet metricset: psutil not found. Install it to get system and process metrics
Exception ignored in: <gzip on 0x10443e590>
Traceback (most recent call last):
  File "/Users/maksych/.local/share/uv/python/cpython-3.13.0-macos-aarch64-none/lib/python3.13/gzip.py", line 378, in close
    fileobj.write(self.compress.flush())
ValueError: I/O operation on closed file.

[josecsotomorales]

Following up, is there any workaround on this one? I see a draft PR with 3.13 support though

[zffocussss]

when is it fixed?

[meako689]

to suppress the message from polluting the logs in your project, this can be done

import sys

def suppressor(unraisable):  # type: ignore
    if unraisable.exc_type is ValueError and "I/O operation on closed file" in str(unraisable.exc_value):
        pass
    else:
        sys.__unraisablehook__(unraisable)


sys.unraisablehook = suppressor

[xrmx]

Yesterday I merged the PR fixing a couple of warnings in main, still in order to have other warnings fixed we are waiting for a Python 3.13 patch release including python/cpython#129726 . If anyone would like to give current main a try it would be much appreciated.

[josecsotomorales]

Thanks @xrmx !! Just saw the issue in CPython; that one was nasty! 🚀