Add available and state valid property to PulseAudio

[breiti]

Proposed change

Until the first response from the PulseAudio server is received, all switches are reported "off", which is not necessarily the correct representation. This change marks the switch as "not available" until the first valid list of loaded modules

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes pulseaudio: Multiple loopbacks for same switch #32016
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  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.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

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[pvizeli]

You need to use a library to speak with PulseAudio, use: https://github.com/mk-fg/python-pulse-control based on: https://developers.home-assistant.io/docs/creating_component_code_review#4-communication-with-devicesservices

This library is supported by Home Assistant because we use also PulseAudio in the background.

[breiti]

While I understand the need for an external library, please note that this PR does not add any new library code but only makes minor changes to already existing code in Home Assistant. Migrating to a library is definitely useful, but this should be a different PR.

[breiti]

@pvizeli: As you suggested, I started to work on replacing the internal library with the pulsectl library. Everything works fine, but when I try to use this on my production system (Home Assistant on Ubuntu/Docker) it seems like the required libpulse.so.0 file is not installed in this Docker container?

[breiti]

After installing libpulse inside the container (apk add libpulse), it seems like this library does not support remote connections. The same code is working fine inside the Debian based dev container...

[MartinHjelmare]

Requesting changes to keep track of PR status.

As stated above, please extract the device specific interface code and data parsing to a standalone library published on PyPI.

https://developers.home-assistant.io/docs/creating_component_code_review#4-communication-with-devicesservices

[pvizeli]

Is added to docker now

[breiti]

Extracting library in #34965, making this PR obsolete.