mirror of
https://github.com/home-assistant/core
synced 2024-08-28 03:36:46 +02:00
214 lines
8.4 KiB
Python
214 lines
8.4 KiB
Python
"""Support for Google Nest SDM Cameras."""
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from __future__ import annotations
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import asyncio
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from collections.abc import Callable
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import datetime
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import functools
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import logging
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from pathlib import Path
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from typing import cast
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from google_nest_sdm.camera_traits import (
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CameraImageTrait,
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CameraLiveStreamTrait,
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RtspStream,
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StreamingProtocol,
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)
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from google_nest_sdm.device import Device
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from google_nest_sdm.device_manager import DeviceManager
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from google_nest_sdm.exceptions import ApiException
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from homeassistant.components.camera import Camera, CameraEntityFeature, StreamType
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from homeassistant.components.stream import CONF_EXTRA_PART_WAIT_TIME
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from homeassistant.config_entries import ConfigEntry
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from homeassistant.core import HomeAssistant
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from homeassistant.exceptions import HomeAssistantError
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from homeassistant.helpers.entity_platform import AddEntitiesCallback
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from homeassistant.helpers.event import async_track_point_in_utc_time
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from homeassistant.util.dt import utcnow
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from .const import DATA_DEVICE_MANAGER, DOMAIN
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from .device_info import NestDeviceInfo
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_LOGGER = logging.getLogger(__name__)
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PLACEHOLDER = Path(__file__).parent / "placeholder.png"
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# Used to schedule an alarm to refresh the stream before expiration
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STREAM_EXPIRATION_BUFFER = datetime.timedelta(seconds=30)
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async def async_setup_entry(
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hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
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) -> None:
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"""Set up the cameras."""
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device_manager: DeviceManager = hass.data[DOMAIN][entry.entry_id][
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DATA_DEVICE_MANAGER
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]
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entities = []
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for device in device_manager.devices.values():
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if (
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CameraImageTrait.NAME in device.traits
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or CameraLiveStreamTrait.NAME in device.traits
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):
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entities.append(NestCamera(device))
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async_add_entities(entities)
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class NestCamera(Camera):
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"""Devices that support cameras."""
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_attr_has_entity_name = True
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_attr_name = None
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def __init__(self, device: Device) -> None:
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"""Initialize the camera."""
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super().__init__()
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self._device = device
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nest_device_info = NestDeviceInfo(device)
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self._attr_device_info = nest_device_info.device_info
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self._attr_brand = nest_device_info.device_brand
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self._attr_model = nest_device_info.device_model
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self._stream: RtspStream | None = None
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self._create_stream_url_lock = asyncio.Lock()
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self._stream_refresh_unsub: Callable[[], None] | None = None
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self._attr_is_streaming = False
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self._attr_supported_features = CameraEntityFeature(0)
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self._rtsp_live_stream_trait: CameraLiveStreamTrait | None = None
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if CameraLiveStreamTrait.NAME in self._device.traits:
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self._attr_is_streaming = True
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self._attr_supported_features |= CameraEntityFeature.STREAM
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trait = cast(
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CameraLiveStreamTrait, self._device.traits[CameraLiveStreamTrait.NAME]
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)
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if StreamingProtocol.RTSP in trait.supported_protocols:
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self._rtsp_live_stream_trait = trait
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self.stream_options[CONF_EXTRA_PART_WAIT_TIME] = 3
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# The API "name" field is a unique device identifier.
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self._attr_unique_id = f"{self._device.name}-camera"
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@property
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def use_stream_for_stills(self) -> bool:
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"""Whether or not to use stream to generate stills."""
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return self._rtsp_live_stream_trait is not None
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@property
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def frontend_stream_type(self) -> StreamType | None:
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"""Return the type of stream supported by this camera."""
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if CameraLiveStreamTrait.NAME not in self._device.traits:
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return None
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trait = self._device.traits[CameraLiveStreamTrait.NAME]
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if StreamingProtocol.WEB_RTC in trait.supported_protocols:
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return StreamType.WEB_RTC
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return super().frontend_stream_type
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@property
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def available(self) -> bool:
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"""Return True if entity is available."""
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# Cameras are marked unavailable on stream errors in #54659 however nest
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# streams have a high error rate (#60353). Given nest streams are so flaky,
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# marking the stream unavailable has other side effects like not showing
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# the camera image which sometimes are still able to work. Until the
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# streams are fixed, just leave the streams as available.
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return True
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async def stream_source(self) -> str | None:
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"""Return the source of the stream."""
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if not self._rtsp_live_stream_trait:
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return None
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async with self._create_stream_url_lock:
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if not self._stream:
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_LOGGER.debug("Fetching stream url")
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try:
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self._stream = (
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await self._rtsp_live_stream_trait.generate_rtsp_stream()
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)
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except ApiException as err:
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raise HomeAssistantError(f"Nest API error: {err}") from err
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self._schedule_stream_refresh()
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assert self._stream
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if self._stream.expires_at < utcnow():
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_LOGGER.warning("Stream already expired")
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return self._stream.rtsp_stream_url
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def _schedule_stream_refresh(self) -> None:
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"""Schedules an alarm to refresh the stream url before expiration."""
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assert self._stream
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_LOGGER.debug("New stream url expires at %s", self._stream.expires_at)
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refresh_time = self._stream.expires_at - STREAM_EXPIRATION_BUFFER
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# Schedule an alarm to extend the stream
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if self._stream_refresh_unsub is not None:
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self._stream_refresh_unsub()
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self._stream_refresh_unsub = async_track_point_in_utc_time(
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self.hass,
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self._handle_stream_refresh,
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refresh_time,
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)
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async def _handle_stream_refresh(self, now: datetime.datetime) -> None:
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"""Alarm that fires to check if the stream should be refreshed."""
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if not self._stream:
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return
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_LOGGER.debug("Extending stream url")
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try:
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self._stream = await self._stream.extend_rtsp_stream()
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except ApiException as err:
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_LOGGER.debug("Failed to extend stream: %s", err)
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# Next attempt to catch a url will get a new one
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self._stream = None
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if self.stream:
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await self.stream.stop()
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self.stream = None
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return
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# Update the stream worker with the latest valid url
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if self.stream:
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self.stream.update_source(self._stream.rtsp_stream_url)
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self._schedule_stream_refresh()
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async def async_will_remove_from_hass(self) -> None:
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"""Invalidates the RTSP token when unloaded."""
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if self._stream:
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_LOGGER.debug("Invalidating stream")
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try:
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await self._stream.stop_rtsp_stream()
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except ApiException as err:
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_LOGGER.debug(
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"Failed to revoke stream token, will rely on ttl: %s", err
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)
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if self._stream_refresh_unsub:
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self._stream_refresh_unsub()
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async def async_added_to_hass(self) -> None:
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"""Run when entity is added to register update signal handler."""
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self.async_on_remove(
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self._device.add_update_listener(self.async_write_ha_state)
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)
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async def async_camera_image(
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self, width: int | None = None, height: int | None = None
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) -> bytes | None:
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"""Return bytes of camera image."""
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# Use the thumbnail from RTSP stream, or a placeholder if stream is
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# not supported (e.g. WebRTC) as a fallback when 'use_stream_for_stills' if False
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return await self.hass.async_add_executor_job(self.placeholder_image)
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@classmethod
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@functools.cache
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def placeholder_image(cls) -> bytes:
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"""Return placeholder image to use when no stream is available."""
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return PLACEHOLDER.read_bytes()
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async def async_handle_web_rtc_offer(self, offer_sdp: str) -> str | None:
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"""Return the source of the stream."""
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trait: CameraLiveStreamTrait = self._device.traits[CameraLiveStreamTrait.NAME]
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if StreamingProtocol.WEB_RTC not in trait.supported_protocols:
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return await super().async_handle_web_rtc_offer(offer_sdp)
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try:
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stream = await trait.generate_web_rtc_stream(offer_sdp)
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except ApiException as err:
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raise HomeAssistantError(f"Nest API error: {err}") from err
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return stream.answer_sdp
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