Blocking operations while in asyncio

[NicoIIT]

Describe the bug
This component is using asyncio but performing blocking IO calls.
This is detected by latest version of Home Assistant and issues have been opened on HA side already, needing a fix in this component:

home-assistant/core#120094
home-assistant/core#129749

Guidelines on HA side:
https://developers.home-assistant.io/docs/asyncio_blocking_operations

log from HA

2024-11-19 10:19:19.409 WARNING (MainThread) [homeassistant.util.loop] Detected blocking call to load_default_certs with args (<ssl.SSLContext object at 0x7f613b2ef260>, <Purpose.SERVER_AUTH: _ASN1Object(nid=129, shortname='serverAuth', longname='TLS Web Server Authentication', oid='1.3.6.1.5.5.7.3.1')>) inside the event loop by custom integration 'freebox' at custom_components/freebox/__init__.py, line 27: await api.open(entry.data[CONF_HOST], entry.data[CONF_PORT]) (offender: /usr/local/lib/python3.13/ssl.py, line 722: context.load_default_certs(purpose)), please report it to the author of the 'freebox' custom integration
For developers, please see https://developers.home-assistant.io/docs/asyncio_blocking_operations/#load_default_certs
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 227, in <module>
    sys.exit(main())
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 213, in main
    exit_code = runner.run(runtime_conf)
  File "/usr/src/homeassistant/homeassistant/runner.py", line 154, in run
    return loop.run_until_complete(setup_and_run_hass(runtime_config))
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 708, in run_until_complete
    self.run_forever()
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 679, in run_forever
    self._run_once()
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 2027, in _run_once
    handle._run()
  File "/usr/local/lib/python3.13/asyncio/events.py", line 89, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/src/homeassistant/homeassistant/setup.py", line 165, in async_setup_component
    result = await _async_setup_component(hass, domain, config)
  File "/usr/src/homeassistant/homeassistant/setup.py", line 461, in _async_setup_component
    await asyncio.gather(
  File "/usr/src/homeassistant/homeassistant/setup.py", line 463, in <genexpr>
    create_eager_task(
  File "/usr/src/homeassistant/homeassistant/util/async_.py", line 45, in create_eager_task
    return Task(coro, loop=loop, name=name, eager_start=True)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 783, in async_setup_locked
    await self.async_setup(hass, integration=integration)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 546, in async_setup
    await self.__async_setup_with_context(hass, integration)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 635, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
  File "/config/custom_components/freebox/__init__.py", line 27, in async_setup_entry
    await api.open(entry.data[CONF_HOST], entry.data[CONF_PORT])

2024-11-19 10:19:19.429 WARNING (MainThread) [homeassistant.util.loop] Detected blocking call to load_verify_locations with args (<ssl.SSLContext object at 0x7f613b2ef260>,) inside the event loop by custom integration 'freebox' at custom_components/freebox/__init__.py, line 27: await api.open(entry.data[CONF_HOST], entry.data[CONF_PORT]) (offender: /usr/local/lib/python3.13/site-packages/freebox_api/aiofreepybox.py, line 78: ssl_ctx.load_verify_locations(cafile=cert_path)), please report it to the author of the 'freebox' custom integration
For developers, please see https://developers.home-assistant.io/docs/asyncio_blocking_operations/#load_verify_locations
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 227, in <module>
    sys.exit(main())
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 213, in main
    exit_code = runner.run(runtime_conf)
  File "/usr/src/homeassistant/homeassistant/runner.py", line 154, in run
    return loop.run_until_complete(setup_and_run_hass(runtime_config))
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 708, in run_until_complete
    self.run_forever()
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 679, in run_forever
    self._run_once()
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 2027, in _run_once
    handle._run()
  File "/usr/local/lib/python3.13/asyncio/events.py", line 89, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/src/homeassistant/homeassistant/setup.py", line 165, in async_setup_component
    result = await _async_setup_component(hass, domain, config)
  File "/usr/src/homeassistant/homeassistant/setup.py", line 461, in _async_setup_component
    await asyncio.gather(
  File "/usr/src/homeassistant/homeassistant/setup.py", line 463, in <genexpr>
    create_eager_task(
  File "/usr/src/homeassistant/homeassistant/util/async_.py", line 45, in create_eager_task
    return Task(coro, loop=loop, name=name, eager_start=True)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 783, in async_setup_locked
    await self.async_setup(hass, integration=integration)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 546, in async_setup
    await self.__async_setup_with_context(hass, integration)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 635, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
  File "/config/custom_components/freebox/__init__.py", line 27, in async_setup_entry
    await api.open(entry.data[CONF_HOST], entry.data[CONF_PORT])

2024-11-19 10:19:19.432 INFO (MainThread) [freebox_api.aiofreepybox] Read application authorization file
2024-11-19 10:19:19.435 WARNING (MainThread) [homeassistant.util.loop] Detected blocking call to open with args (PosixPath('/config/.storage/freebox/368qlwmb_fbxos_fr.conf'), 'r') inside the event loop by custom integration 'freebox' at custom_components/freebox/__init__.py, line 27: await api.open(entry.data[CONF_HOST], entry.data[CONF_PORT]) (offender: /usr/local/lib/python3.13/site-packages/freebox_api/aiofreepybox.py, line 255: with open(file, "r") as f:), please report it to the author of the 'freebox' custom integration
For developers, please see https://developers.home-assistant.io/docs/asyncio_blocking_operations/#open
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 227, in <module>
    sys.exit(main())
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 213, in main
    exit_code = runner.run(runtime_conf)
  File "/usr/src/homeassistant/homeassistant/runner.py", line 154, in run
    return loop.run_until_complete(setup_and_run_hass(runtime_config))
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 708, in run_until_complete
    self.run_forever()
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 679, in run_forever
    self._run_once()
  File "/usr/local/lib/python3.13/asyncio/base_events.py", line 2027, in _run_once
    handle._run()
  File "/usr/local/lib/python3.13/asyncio/events.py", line 89, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/src/homeassistant/homeassistant/setup.py", line 165, in async_setup_component
    result = await _async_setup_component(hass, domain, config)
  File "/usr/src/homeassistant/homeassistant/setup.py", line 461, in _async_setup_component
    await asyncio.gather(
  File "/usr/src/homeassistant/homeassistant/setup.py", line 463, in <genexpr>
    create_eager_task(
  File "/usr/src/homeassistant/homeassistant/util/async_.py", line 45, in create_eager_task
    return Task(coro, loop=loop, name=name, eager_start=True)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 783, in async_setup_locked
    await self.async_setup(hass, integration=integration)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 546, in async_setup
    await self.__async_setup_with_context(hass, integration)
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 635, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
  File "/config/custom_components/freebox/__init__.py", line 27, in async_setup_entry
    await api.open(entry.data[CONF_HOST], entry.data[CONF_PORT])

Foreseen changes

• Call _readfile_app_token and _writefile_app_token in class Freepybox using the loop.run_in_executor asyncio wrapper.
• Isolate the SSL Context and ClientSession creation in a dedicated method in class Freepybox, and call it using the loop.run_in_executor asyncio wrapper.