Kombu using deprecated importlib-metadata shims

[syaffers]

Hi devs,

I'm facing the following issue when importing kombu in my code. I've narrowed it down to the library importlib-metadata's most recent release. Here's how to reproduce it:

1. Create a new virtual environment

python -m venv .venv

2. Activate virtual environment

source .venv/bin/activate

3. Install kombu

pip install kombu

4. Confirm that importlib-metadata release 5.0.0 is installed

pip freeze | grep importlib-metadata

5. Run python and import kombu via kombu.entity

>>> from kombu.entity import Queue
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/muhammad.azman/Projects/drilling-management-ds/.venv2/lib/python3.7/site-packages/kombu/entity.py", line 7, in <module>
    from .serialization import prepare_accept_content
  File "/Users/muhammad.azman/Projects/drilling-management-ds/.venv2/lib/python3.7/site-packages/kombu/serialization.py", line 440, in <module>
    for ep, args in entrypoints('kombu.serializers'):  # pragma: no cover
  File "/Users/muhammad.azman/Projects/drilling-management-ds/.venv2/lib/python3.7/site-packages/kombu/utils/compat.py", line 82, in entrypoints
    for ep in importlib_metadata.entry_points().get(namespace, [])
AttributeError: 'EntryPoints' object has no attribute 'get'

It is stated in the most recent release of the library (https://github.com/python/importlib_metadata/blob/v5.0.0/CHANGES.rst)

#97, #284, #300: Removed compatibility shims for deprecated entry point interfaces.

I can confirm kombu still works with the most recent release in v4 (e.g. 4.13.0).

Since this importlib-metadata release 5.0.0 is installed alongside a fresh kombu installation, this could be problematic for new users down the line. I'm suggesting to limit the version to <5.0.0 to ensure usability.

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[syaffers]

Ah I should've mentioned, this happened on my Python 3.7.13. Works with no issues on 3.8.13.

[Aegdesil]

I get a probably related problem on Python 3.7 with kombu 5.2.4 when importing directly from kombu:

>>> from kombu import Consumer
Traceback (most recent call last):
  File "[...]/python3.7/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
ImportError: cannot import name 'Consumer' from 'kombu' ([...]/lib/python3.7/site-packages/kombu/__init__.py)

I can confirm that reverting to importlib-metadata<5.0.0 works.