home-assistant:dev ← home-assistant:pre_imports
opened 06:19AM - 25 Feb 24 UTC
## Proposed change
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While investigating Bluetooth problems on a Home Assistant Green, I found that Bluetooth failed to start because the event loop was blocked for 7-12s from loading `matter` which cause the system to be unstable and timeout many tasks
https://github.com/home-assistant-libs/python-matter-server/issues/578
Load integrations in the executor if `import_executor` is specified in `manifest.json` to avoid the module blocking the event loop.
I expect this change will fix hundreds of unexplained startup issues. It will also solve some instability at run time since the same problem happens when an integration is discovered and the config flow is loaded since it loads the modules there as well.
This is opt-in because some modules are cheap to import or call `asyncio.get_running_loop()` or similar during import so they can't be imported in the executor.
## Type of change
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- [ ] Dependency upgrade
- [ ] Bugfix (non-breaking change which fixes an issue)
- [ ] New integration (thank you!)
- [ ] New feature (which adds functionality to an existing integration)
- [ ] Deprecation (breaking change to happen in the future)
- [ ] Breaking change (fix/feature causing existing functionality to break)
- [x] Code quality improvements to existing code or addition of tests
## Additional information
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- This PR fixes or closes issue: fixes https://github.com/home-assistant-libs/python-matter-server/issues/578
- This PR is related to issue:
- Link to documentation pull request: https://github.com/home-assistant/developers.home-assistant/pull/2088
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- [x] Tests have been added to verify that the new code works.
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- [x] Documentation added/updated for [developers.home-assistant.io][docs-repository]
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Updated and included derived files by running: `python3 -m script.hassfest`.
- [ ] New or updated dependencies have been added to `requirements_all.txt`.
Updated by running `python3 -m script.gen_requirements_all`.
- [ ] For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
- [ ] Untested files have been added to `.coveragerc`.
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