221 lines
7.8 KiB
Python
221 lines
7.8 KiB
Python
"""Go2rtc server."""
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import asyncio
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from contextlib import suppress
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import logging
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from tempfile import NamedTemporaryFile
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from go2rtc_client import Go2RtcRestClient
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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.aiohttp_client import async_get_clientsession
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from .const import DEFAULT_URL
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_LOGGER = logging.getLogger(__name__)
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_TERMINATE_TIMEOUT = 5
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_SETUP_TIMEOUT = 30
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_SUCCESSFUL_BOOT_MESSAGE = "INF [api] listen addr="
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_LOCALHOST_IP = "127.0.0.1"
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_RESPAWN_COOLDOWN = 1
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# Default configuration for HA
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# - Api is listening only on localhost
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# - Disable rtsp listener
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# - Clear default ice servers
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_GO2RTC_CONFIG_FORMAT = r"""
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api:
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listen: "{api_ip}:1984"
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rtsp:
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# ffmpeg needs rtsp for opus audio transcoding
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listen: "127.0.0.1:8554"
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webrtc:
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ice_servers: []
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"""
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class Go2RTCServerStartError(HomeAssistantError):
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"""Raised when server does not start."""
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_message = "Go2rtc server didn't start correctly"
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class Go2RTCWatchdogError(HomeAssistantError):
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"""Raised on watchdog error."""
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def _create_temp_file(api_ip: str) -> str:
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"""Create temporary config file."""
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# Set delete=False to prevent the file from being deleted when the file is closed
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# Linux is clearing tmp folder on reboot, so no need to delete it manually
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with NamedTemporaryFile(prefix="go2rtc_", suffix=".yaml", delete=False) as file:
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file.write(_GO2RTC_CONFIG_FORMAT.format(api_ip=api_ip).encode())
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return file.name
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class Server:
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"""Go2rtc server."""
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def __init__(
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self, hass: HomeAssistant, binary: str, *, enable_ui: bool = False
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) -> None:
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"""Initialize the server."""
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self._hass = hass
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self._binary = binary
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self._process: asyncio.subprocess.Process | None = None
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self._startup_complete = asyncio.Event()
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self._api_ip = _LOCALHOST_IP
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if enable_ui:
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# Listen on all interfaces for allowing access from all ips
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self._api_ip = ""
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self._watchdog_task: asyncio.Task | None = None
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self._watchdog_tasks: list[asyncio.Task] = []
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async def start(self) -> None:
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"""Start the server."""
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await self._start()
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self._watchdog_task = asyncio.create_task(
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self._watchdog(), name="Go2rtc respawn"
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)
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async def _start(self) -> None:
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"""Start the server."""
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_LOGGER.debug("Starting go2rtc server")
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config_file = await self._hass.async_add_executor_job(
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_create_temp_file, self._api_ip
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)
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self._startup_complete.clear()
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self._process = await asyncio.create_subprocess_exec(
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self._binary,
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"-c",
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config_file,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.STDOUT,
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close_fds=False, # required for posix_spawn on CPython < 3.13
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)
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self._hass.async_create_background_task(
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self._log_output(self._process), "Go2rtc log output"
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)
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try:
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async with asyncio.timeout(_SETUP_TIMEOUT):
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await self._startup_complete.wait()
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except TimeoutError as err:
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msg = "Go2rtc server didn't start correctly"
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_LOGGER.exception(msg)
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await self._stop()
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raise Go2RTCServerStartError from err
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# Check the server version
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client = Go2RtcRestClient(async_get_clientsession(self._hass), DEFAULT_URL)
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await client.validate_server_version()
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async def _log_output(self, process: asyncio.subprocess.Process) -> None:
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"""Log the output of the process."""
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assert process.stdout is not None
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async for line in process.stdout:
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msg = line[:-1].decode().strip()
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_LOGGER.debug(msg)
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if not self._startup_complete.is_set() and _SUCCESSFUL_BOOT_MESSAGE in msg:
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self._startup_complete.set()
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async def _watchdog(self) -> None:
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"""Keep respawning go2rtc servers.
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A new go2rtc server is spawned if the process terminates or the API
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stops responding.
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"""
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while True:
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try:
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monitor_process_task = asyncio.create_task(self._monitor_process())
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self._watchdog_tasks.append(monitor_process_task)
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monitor_process_task.add_done_callback(self._watchdog_tasks.remove)
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monitor_api_task = asyncio.create_task(self._monitor_api())
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self._watchdog_tasks.append(monitor_api_task)
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monitor_api_task.add_done_callback(self._watchdog_tasks.remove)
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try:
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await asyncio.gather(monitor_process_task, monitor_api_task)
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except Go2RTCWatchdogError:
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_LOGGER.debug("Caught Go2RTCWatchdogError")
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for task in self._watchdog_tasks:
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if task.done():
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if not task.cancelled():
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task.exception()
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continue
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task.cancel()
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await asyncio.sleep(_RESPAWN_COOLDOWN)
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try:
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await self._stop()
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_LOGGER.debug("Spawning new go2rtc server")
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with suppress(Go2RTCServerStartError):
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await self._start()
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except Exception:
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_LOGGER.exception(
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"Unexpected error when restarting go2rtc server"
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)
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except Exception:
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_LOGGER.exception("Unexpected error in go2rtc server watchdog")
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async def _monitor_process(self) -> None:
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"""Raise if the go2rtc process terminates."""
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_LOGGER.debug("Monitoring go2rtc server process")
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if self._process:
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await self._process.wait()
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_LOGGER.debug("go2rtc server terminated")
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raise Go2RTCWatchdogError("Process ended")
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async def _monitor_api(self) -> None:
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"""Raise if the go2rtc process terminates."""
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client = Go2RtcRestClient(async_get_clientsession(self._hass), DEFAULT_URL)
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_LOGGER.debug("Monitoring go2rtc API")
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try:
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while True:
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await client.validate_server_version()
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await asyncio.sleep(10)
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except Exception as err:
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_LOGGER.debug("go2rtc API did not reply", exc_info=True)
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raise Go2RTCWatchdogError("API error") from err
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async def _stop_watchdog(self) -> None:
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"""Handle watchdog stop request."""
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tasks: list[asyncio.Task] = []
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if watchdog_task := self._watchdog_task:
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self._watchdog_task = None
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tasks.append(watchdog_task)
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watchdog_task.cancel()
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for task in self._watchdog_tasks:
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tasks.append(task)
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task.cancel()
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await asyncio.gather(*tasks, return_exceptions=True)
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async def stop(self) -> None:
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"""Stop the server and abort the watchdog task."""
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_LOGGER.debug("Server stop requested")
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await self._stop_watchdog()
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await self._stop()
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async def _stop(self) -> None:
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"""Stop the server."""
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if self._process:
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_LOGGER.debug("Stopping go2rtc server")
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process = self._process
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self._process = None
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with suppress(ProcessLookupError):
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process.terminate()
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try:
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await asyncio.wait_for(process.wait(), timeout=_TERMINATE_TIMEOUT)
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except TimeoutError:
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_LOGGER.warning("Go2rtc server didn't terminate gracefully. Killing it")
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with suppress(ProcessLookupError):
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process.kill()
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else:
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_LOGGER.debug("Go2rtc server has been stopped")
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