63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
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import asyncio
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import contextlib
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import logging
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import re
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from typing import Optional
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logger = logging.getLogger(__name__)
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async def _get_bluetoothctl_version() -> Optional[re.Match]:
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"""Get the version of bluetoothctl."""
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with contextlib.suppress(Exception):
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proc = await asyncio.create_subprocess_exec(
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"bluetoothctl", "--version", stdout=asyncio.subprocess.PIPE
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)
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out = await proc.stdout.read()
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version = re.search(b"(\\d+).(\\d+)", out.strip(b"'"))
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await proc.wait()
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return version
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return None
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class BlueZFeatures:
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"""Check which features are supported by the BlueZ backend."""
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checked_bluez_version = False
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supported_version = True
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can_write_without_response = True
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write_without_response_workaround_needed = False
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hides_battery_characteristic = True
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hides_device_name_characteristic = True
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_check_bluez_event: Optional[asyncio.Event] = None
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@classmethod
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async def check_bluez_version(cls) -> None:
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"""Check the bluez version."""
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if cls._check_bluez_event:
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# If there is already a check in progress
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# it wins, wait for it instead
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await cls._check_bluez_event.wait()
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return
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cls._check_bluez_event = asyncio.Event()
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version_output = await _get_bluetoothctl_version()
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if version_output:
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major, minor = tuple(map(int, version_output.groups()))
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cls.supported_version = major == 5 and minor >= 34
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cls.can_write_without_response = major == 5 and minor >= 46
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cls.write_without_response_workaround_needed = not (
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major == 5 and minor >= 51
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)
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cls.hides_battery_characteristic = major == 5 and minor >= 48 and minor < 55
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cls.hides_device_name_characteristic = major == 5 and minor >= 48
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else:
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# Its possible they may be running inside a container where
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# bluetoothctl is not available and they only have access to the
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# BlueZ D-Bus API.
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logging.warning(
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"Could not determine BlueZ version, bluetoothctl not available, assuming 5.51+"
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)
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cls._check_bluez_event.set()
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cls.checked_bluez_version = True
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