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stevedore
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Manage dynamic plugins for Python applications
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Ian Wienand 5189992d71
Order old importlib-metadata results by group 
A Debian Buster-based zuul-jobs test started failing when using stestr
recently [1].  Upon further investigation, this is a Python 3.7
environment which is affected by a recent breaking change to
importlib_metadata.

It seems stevedore worked around this with
Ib9c2b0a14edea91e97d122d2ac93b650029f918e, which was released with
3.5.1 -- but I was still seeing the issue.

Upon further investigation, the "real_groups" dict being returned here
with importlib-metadata 4.12.0 is in buckets by group, e.g.

 {'group.one': [EntryPoint(name='foo', ... , group='group.one'),
                EntryPoint(name='bar', ... , group='group.one')],
  'group.two': [EntryPoint(name='moo', ... , group='group.two'),
                EntryPoint(name='goo', ... , group='group.two')],
 }

This current code seems to return a dict with entry-points by thier
name, e.g.

 {'foo': EntryPoint(name='foo', ... , group='group.one),
  'bar': EntryPoint(name='bar', ... , group='group.one),
  'moo': EntryPoint(name='moo', ... , group='group.two),
  'goo': EntryPoint(name='goo', ... , group='group.two)
 }

This reorgansies the fixup routine to put entry-points in a bucket by
their group.  With this change, stestr is again finding it's command
plugins.

[1] https://github.com/mtreinish/stestr/issues/336
[2] https://github.com/python/importlib_metadata/issues/409

Change-Id: I3496ab1dfa312b1098a869cdfd9a0c6f81653b28
 		2022-10-19 07:57:43 +11:00
doc remove unicode from code 2022-08-25 09:14:44 +08:00
releasenotes Merge "remove unicode from code" 2022-10-03 16:27:53 +00:00
stevedore Order old importlib-metadata results by group 2022-10-19 07:57:43 +11:00
.gitignore Drop Python 2.7 support 2020-04-21 15:14:10 +01:00
.gitreview OpenDev Migration Patch 2019-04-19 19:31:04 +00:00
.pre-commit-config.yaml Move flake8 as a pre-commit local target. 2021-03-23 13:11:54 +01:00
.stestr.conf Switch to stestr 2018-07-05 18:04:48 +07:00
.zuul.yaml Add Python3 antelope unit tests 2022-09-09 09:19:31 +00:00
CONTRIBUTING.rst Workflow documentation is now in infra-manual 2014-12-05 03:30:40 +00:00
LICENSE add license 2012-06-19 14:33:24 -04:00
README.rst update git.openstack.org to opendev 2019-04-25 01:07:11 +00:00
bindep.txt Add local bindep.txt 2019-06-27 12:59:31 +02:00
requirements.txt Fix remaining logic to support Python 3.6/7 2022-06-21 21:54:06 +09:00
setup.cfg Drop python3.6/3.7 support in testing runtime 2022-05-05 16:02:13 +02:00
setup.py Drop Python 2.7 support 2020-04-21 15:14:10 +01:00
test-requirements.txt Adding pre-commit 2020-09-15 13:40:37 +02:00
tox.ini Remove lower-constraints remnants 2021-04-16 11:03:09 +00:00

README.rst

stevedore -- Manage dynamic plugins for Python applications

Latest Version

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Python makes loading code dynamically easy, allowing you to configure and extend your application by discovering and loading extensions ("plugins") at runtime. Many applications implement their own library for doing this, using __import__ or importlib. stevedore avoids creating yet another extension mechanism by building on top of setuptools entry points. The code for managing entry points tends to be repetitive, though, so stevedore provides manager classes for implementing common patterns for using dynamically loaded extensions.