399 lines
14 KiB
Python
399 lines
14 KiB
Python
"""Base classes for HA Bluetooth scanners for bluetooth."""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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from collections.abc import Callable, Generator
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from contextlib import contextmanager
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from dataclasses import dataclass
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import datetime
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from datetime import timedelta
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import logging
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from typing import Any, Final
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from bleak.backends.device import BLEDevice
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from bleak.backends.scanner import AdvertisementData
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from bleak_retry_connector import NO_RSSI_VALUE
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from bluetooth_adapters import DiscoveredDeviceAdvertisementData, adapter_human_name
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from home_assistant_bluetooth import BluetoothServiceInfoBleak
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from homeassistant.const import EVENT_HOMEASSISTANT_STOP
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from homeassistant.core import (
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CALLBACK_TYPE,
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Event,
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HomeAssistant,
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callback as hass_callback,
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)
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from homeassistant.helpers.event import async_track_time_interval
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import homeassistant.util.dt as dt_util
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from homeassistant.util.dt import monotonic_time_coarse
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from . import models
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from .const import (
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CONNECTABLE_FALLBACK_MAXIMUM_STALE_ADVERTISEMENT_SECONDS,
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SCANNER_WATCHDOG_INTERVAL,
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SCANNER_WATCHDOG_TIMEOUT,
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)
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from .models import HaBluetoothConnector
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MONOTONIC_TIME: Final = monotonic_time_coarse
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_LOGGER = logging.getLogger(__name__)
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@dataclass(slots=True)
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class BluetoothScannerDevice:
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"""Data for a bluetooth device from a given scanner."""
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scanner: BaseHaScanner
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ble_device: BLEDevice
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advertisement: AdvertisementData
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class BaseHaScanner(ABC):
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"""Base class for Ha Scanners."""
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__slots__ = (
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"hass",
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"adapter",
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"connectable",
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"source",
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"connector",
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"_connecting",
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"name",
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"scanning",
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"_last_detection",
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"_start_time",
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"_cancel_watchdog",
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)
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def __init__(
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self,
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hass: HomeAssistant,
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source: str,
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adapter: str,
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connector: HaBluetoothConnector | None = None,
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) -> None:
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"""Initialize the scanner."""
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self.hass = hass
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self.connectable = False
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self.source = source
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self.connector = connector
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self._connecting = 0
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self.adapter = adapter
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self.name = adapter_human_name(adapter, source) if adapter != source else source
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self.scanning = True
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self._last_detection = 0.0
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self._start_time = 0.0
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self._cancel_watchdog: CALLBACK_TYPE | None = None
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@hass_callback
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def _async_stop_scanner_watchdog(self) -> None:
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"""Stop the scanner watchdog."""
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if self._cancel_watchdog:
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self._cancel_watchdog()
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self._cancel_watchdog = None
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@hass_callback
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def _async_setup_scanner_watchdog(self) -> None:
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"""If something has restarted or updated, we need to restart the scanner."""
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self._start_time = self._last_detection = MONOTONIC_TIME()
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if not self._cancel_watchdog:
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self._cancel_watchdog = async_track_time_interval(
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self.hass,
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self._async_scanner_watchdog,
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SCANNER_WATCHDOG_INTERVAL,
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name=f"{self.name} Bluetooth scanner watchdog",
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)
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@hass_callback
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def _async_watchdog_triggered(self) -> bool:
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"""Check if the watchdog has been triggered."""
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time_since_last_detection = MONOTONIC_TIME() - self._last_detection
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_LOGGER.debug(
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"%s: Scanner watchdog time_since_last_detection: %s",
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self.name,
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time_since_last_detection,
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)
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return time_since_last_detection > SCANNER_WATCHDOG_TIMEOUT
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@hass_callback
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def _async_scanner_watchdog(self, now: datetime.datetime) -> None:
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"""Check if the scanner is running.
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Override this method if you need to do something else when the watchdog
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is triggered.
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"""
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if self._async_watchdog_triggered():
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_LOGGER.info(
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(
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"%s: Bluetooth scanner has gone quiet for %ss, check logs on the"
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" scanner device for more information"
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),
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self.name,
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SCANNER_WATCHDOG_TIMEOUT,
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)
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@contextmanager
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def connecting(self) -> Generator[None, None, None]:
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"""Context manager to track connecting state."""
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self._connecting += 1
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self.scanning = not self._connecting
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try:
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yield
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finally:
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self._connecting -= 1
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self.scanning = not self._connecting
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@property
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@abstractmethod
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def discovered_devices(self) -> list[BLEDevice]:
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"""Return a list of discovered devices."""
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@property
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@abstractmethod
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def discovered_devices_and_advertisement_data(
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self,
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) -> dict[str, tuple[BLEDevice, AdvertisementData]]:
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"""Return a list of discovered devices and their advertisement data."""
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async def async_diagnostics(self) -> dict[str, Any]:
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"""Return diagnostic information about the scanner."""
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device_adv_datas = self.discovered_devices_and_advertisement_data.values()
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return {
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"name": self.name,
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"start_time": self._start_time,
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"source": self.source,
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"scanning": self.scanning,
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"type": self.__class__.__name__,
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"last_detection": self._last_detection,
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"monotonic_time": MONOTONIC_TIME(),
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"discovered_devices_and_advertisement_data": [
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{
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"name": device.name,
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"address": device.address,
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"rssi": advertisement_data.rssi,
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"advertisement_data": advertisement_data,
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"details": device.details,
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}
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for device, advertisement_data in device_adv_datas
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],
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}
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class BaseHaRemoteScanner(BaseHaScanner):
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"""Base class for a Home Assistant remote BLE scanner."""
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__slots__ = (
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"_new_info_callback",
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"_discovered_device_advertisement_datas",
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"_discovered_device_timestamps",
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"_details",
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"_expire_seconds",
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"_storage",
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)
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def __init__(
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self,
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hass: HomeAssistant,
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scanner_id: str,
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name: str,
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new_info_callback: Callable[[BluetoothServiceInfoBleak], None],
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connector: HaBluetoothConnector | None,
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connectable: bool,
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) -> None:
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"""Initialize the scanner."""
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super().__init__(hass, scanner_id, name, connector)
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self._new_info_callback = new_info_callback
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self._discovered_device_advertisement_datas: dict[
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str, tuple[BLEDevice, AdvertisementData]
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] = {}
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self._discovered_device_timestamps: dict[str, float] = {}
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self.connectable = connectable
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self._details: dict[str, str | HaBluetoothConnector] = {"source": scanner_id}
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# Scanners only care about connectable devices. The manager
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# will handle taking care of availability for non-connectable devices
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self._expire_seconds = CONNECTABLE_FALLBACK_MAXIMUM_STALE_ADVERTISEMENT_SECONDS
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assert models.MANAGER is not None
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self._storage = models.MANAGER.storage
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@hass_callback
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def async_setup(self) -> CALLBACK_TYPE:
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"""Set up the scanner."""
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if history := self._storage.async_get_advertisement_history(self.source):
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self._discovered_device_advertisement_datas = (
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history.discovered_device_advertisement_datas
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)
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self._discovered_device_timestamps = history.discovered_device_timestamps
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# Expire anything that is too old
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self._async_expire_devices(dt_util.utcnow())
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cancel_track = async_track_time_interval(
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self.hass,
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self._async_expire_devices,
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timedelta(seconds=30),
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name=f"{self.name} Bluetooth scanner device expire",
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)
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cancel_stop = self.hass.bus.async_listen(
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EVENT_HOMEASSISTANT_STOP, self._async_save_history
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)
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self._async_setup_scanner_watchdog()
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@hass_callback
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def _cancel() -> None:
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self._async_save_history()
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self._async_stop_scanner_watchdog()
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cancel_track()
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cancel_stop()
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return _cancel
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@hass_callback
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def _async_save_history(self, event: Event | None = None) -> None:
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"""Save the history."""
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self._storage.async_set_advertisement_history(
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self.source,
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DiscoveredDeviceAdvertisementData(
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self.connectable,
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self._expire_seconds,
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self._discovered_device_advertisement_datas,
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self._discovered_device_timestamps,
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),
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)
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@hass_callback
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def _async_expire_devices(self, _datetime: datetime.datetime) -> None:
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"""Expire old devices."""
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now = MONOTONIC_TIME()
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expired = [
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address
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for address, timestamp in self._discovered_device_timestamps.items()
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if now - timestamp > self._expire_seconds
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]
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for address in expired:
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del self._discovered_device_advertisement_datas[address]
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del self._discovered_device_timestamps[address]
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@property
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def discovered_devices(self) -> list[BLEDevice]:
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"""Return a list of discovered devices."""
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device_adv_datas = self._discovered_device_advertisement_datas.values()
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return [
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device_advertisement_data[0]
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for device_advertisement_data in device_adv_datas
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]
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@property
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def discovered_devices_and_advertisement_data(
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self,
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) -> dict[str, tuple[BLEDevice, AdvertisementData]]:
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"""Return a list of discovered devices and advertisement data."""
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return self._discovered_device_advertisement_datas
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@hass_callback
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def _async_on_advertisement(
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self,
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address: str,
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rssi: int,
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local_name: str | None,
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service_uuids: list[str],
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service_data: dict[str, bytes],
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manufacturer_data: dict[int, bytes],
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tx_power: int | None,
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details: dict[Any, Any],
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) -> None:
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"""Call the registered callback."""
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now = MONOTONIC_TIME()
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self._last_detection = now
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if prev_discovery := self._discovered_device_advertisement_datas.get(address):
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# Merge the new data with the old data
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# to function the same as BlueZ which
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# merges the dicts on PropertiesChanged
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prev_device = prev_discovery[0]
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prev_advertisement = prev_discovery[1]
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prev_service_uuids = prev_advertisement.service_uuids
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prev_service_data = prev_advertisement.service_data
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prev_manufacturer_data = prev_advertisement.manufacturer_data
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prev_name = prev_device.name
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if local_name and prev_name and len(prev_name) > len(local_name):
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local_name = prev_name
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if service_uuids and service_uuids != prev_service_uuids:
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service_uuids = list(set(service_uuids + prev_service_uuids))
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elif not service_uuids:
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service_uuids = prev_service_uuids
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if service_data and service_data != prev_service_data:
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service_data = prev_service_data | service_data
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elif not service_data:
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service_data = prev_service_data
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if manufacturer_data and manufacturer_data != prev_manufacturer_data:
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manufacturer_data = prev_manufacturer_data | manufacturer_data
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elif not manufacturer_data:
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manufacturer_data = prev_manufacturer_data
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#
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# Bleak updates the BLEDevice via create_or_update_device.
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# We need to do the same to ensure integrations that already
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# have the BLEDevice object get the updated details when they
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# change.
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#
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# https://github.com/hbldh/bleak/blob/222618b7747f0467dbb32bd3679f8cfaa19b1668/bleak/backends/scanner.py#L203
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#
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device = prev_device
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device.name = local_name
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device.details = self._details | details
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# pylint: disable-next=protected-access
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device._rssi = rssi # deprecated, will be removed in newer bleak
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else:
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device = BLEDevice(
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address=address,
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name=local_name,
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details=self._details | details,
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rssi=rssi, # deprecated, will be removed in newer bleak
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)
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advertisement_data = AdvertisementData(
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local_name=None if local_name == "" else local_name,
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manufacturer_data=manufacturer_data,
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service_data=service_data,
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service_uuids=service_uuids,
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tx_power=NO_RSSI_VALUE if tx_power is None else tx_power,
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rssi=rssi,
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platform_data=(),
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)
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self._discovered_device_advertisement_datas[address] = (
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device,
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advertisement_data,
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)
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self._discovered_device_timestamps[address] = now
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self._new_info_callback(
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BluetoothServiceInfoBleak(
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name=local_name or address,
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address=address,
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rssi=rssi,
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manufacturer_data=manufacturer_data,
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service_data=service_data,
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service_uuids=service_uuids,
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source=self.source,
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device=device,
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advertisement=advertisement_data,
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connectable=self.connectable,
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time=now,
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)
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)
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async def async_diagnostics(self) -> dict[str, Any]:
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"""Return diagnostic information about the scanner."""
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now = MONOTONIC_TIME()
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return await super().async_diagnostics() | {
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"storage": self._storage.async_get_advertisement_history_as_dict(
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self.source
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),
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"connectable": self.connectable,
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"discovered_device_timestamps": self._discovered_device_timestamps,
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"time_since_last_device_detection": {
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address: now - timestamp
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for address, timestamp in self._discovered_device_timestamps.items()
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},
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}
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