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ESPHome trigger reconnect immediately when mDNS record received (#48129)

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Otto Winter 2021-03-21 01:49:03 +01:00 • committed by GitHub
parent 46a3b80a2d
commit 0193f16ae9
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2 changed files with 207 additions and 64 deletions
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272
homeassistant/components/esphome/__init__.py
View file

@ -18,6 +18,7 @@ from aioesphomeapi import (
UserServiceArgType,
)
import voluptuous as vol
from zeroconf import DNSPointer, DNSRecord, RecordUpdateListener, Zeroconf
from homeassistant import const
from homeassistant.components import zeroconf
@ -199,7 +200,9 @@ async def async_setup_entry(hass: HomeAssistantType, entry: ConfigEntry) -> bool
# Re-connection logic will trigger after this
await cli.disconnect()
try_connect = await _setup_auto_reconnect_logic(hass, cli, entry, host, on_login)
reconnect_logic = ReconnectLogic(
hass, cli, entry, host, on_login, zeroconf_instance
)
async def complete_setup() -> None:
"""Complete the config entry setup."""
@ -207,85 +210,228 @@ async def async_setup_entry(hass: HomeAssistantType, entry: ConfigEntry) -> bool
await entry_data.async_update_static_infos(hass, entry, infos)
await _setup_services(hass, entry_data, services)
# Create connection attempt outside of HA's tracked task in order
# not to delay startup.
hass.loop.create_task(try_connect(is_disconnect=False))
await reconnect_logic.start()
entry_data.cleanup_callbacks.append(reconnect_logic.stop_callback)
hass.async_create_task(complete_setup())
return True
async def _setup_auto_reconnect_logic(
hass: HomeAssistantType, cli: APIClient, entry: ConfigEntry, host: str, on_login
):
"""Set up the re-connect logic for the API client."""
class ReconnectLogic(RecordUpdateListener):
"""Reconnectiong logic handler for ESPHome config entries.
async def try_connect(tries: int = 0, is_disconnect: bool = True) -> None:
"""Try connecting to the API client. Will retry if not successful."""
if entry.entry_id not in hass.data[DOMAIN]:
Contains two reconnect strategies:
- Connect with increasing time between connection attempts.
- Listen to zeroconf mDNS records, if any records are found for this device, try reconnecting immediately.
"""
def __init__(
self,
hass: HomeAssistantType,
cli: APIClient,
entry: ConfigEntry,
host: str,
on_login,
zc: Zeroconf,
):
"""Initialize ReconnectingLogic."""
self._hass = hass
self._cli = cli
self._entry = entry
self._host = host
self._on_login = on_login
self._zc = zc
# Flag to check if the device is connected
self._connected = True
self._connected_lock = asyncio.Lock()
# Event the different strategies use for issuing a reconnect attempt.
self._reconnect_event = asyncio.Event()
# The task containing the infinite reconnect loop while running
self._loop_task: asyncio.Task | None = None
# How many reconnect attempts have there been already, used for exponential wait time
self._tries = 0
self._tries_lock = asyncio.Lock()
# Track the wait task to cancel it on HA shutdown
self._wait_task: asyncio.Task | None = None
self._wait_task_lock = asyncio.Lock()
@property
def _entry_data(self) -> RuntimeEntryData | None:
return self._hass.data[DOMAIN].get(self._entry.entry_id)
async def _on_disconnect(self):
"""Log and issue callbacks when disconnecting."""
if self._entry_data is None:
return
# This can happen often depending on WiFi signal strength.
# So therefore all these connection warnings are logged
# as infos. The "unavailable" logic will still trigger so the
# user knows if the device is not connected.
_LOGGER.info("Disconnected from ESPHome API for %s", self._host)
# Run disconnect hooks
for disconnect_cb in self._entry_data.disconnect_callbacks:
disconnect_cb()
self._entry_data.disconnect_callbacks = []
self._entry_data.available = False
self._entry_data.async_update_device_state(self._hass)
# Reset tries
async with self._tries_lock:
self._tries = 0
# Connected needs to be reset before the reconnect event (opposite order of check)
async with self._connected_lock:
self._connected = False
self._reconnect_event.set()
async def _wait_and_start_reconnect(self):
"""Wait for exponentially increasing time to issue next reconnect event."""
async with self._tries_lock:
tries = self._tries
# If not first re-try, wait and print message
# Cap wait time at 1 minute. This is because while working on the
# device (e.g. soldering stuff), users don't want to have to wait
# a long time for their device to show up in HA again (this was
# mentioned a lot in early feedback)
tries = min(tries, 10) # prevent OverflowError
wait_time = int(round(min(1.8 ** tries, 60.0)))
if tries == 1:
_LOGGER.info("Trying to reconnect to %s in the background", self._host)
_LOGGER.debug("Retrying %s in %d seconds", self._host, wait_time)
await asyncio.sleep(wait_time)
async with self._wait_task_lock:
self._wait_task = None
self._reconnect_event.set()
async def _try_connect(self):
"""Try connecting to the API client."""
async with self._tries_lock:
tries = self._tries
self._tries += 1
try:
await self._cli.connect(on_stop=self._on_disconnect, login=True)
except APIConnectionError as error:
level = logging.WARNING if tries == 0 else logging.DEBUG
_LOGGER.log(
level,
"Can't connect to ESPHome API for %s (%s): %s",
self._entry.unique_id,
self._host,
error,
)
# Schedule re-connect in event loop in order not to delay HA
# startup. First connect is scheduled in tracked tasks.
async with self._wait_task_lock:
# Allow only one wait task at a time
# can happen if mDNS record received while waiting, then use existing wait task
if self._wait_task is not None:
return
self._wait_task = self._hass.loop.create_task(
self._wait_and_start_reconnect()
)
else:
_LOGGER.info("Successfully connected to %s", self._host)
async with self._tries_lock:
self._tries = 0
async with self._connected_lock:
self._connected = True
self._hass.async_create_task(self._on_login())
async def _reconnect_once(self):
# Wait and clear reconnection event
await self._reconnect_event.wait()
self._reconnect_event.clear()
# If in connected state, do not try to connect again.
async with self._connected_lock:
if self._connected:
return False
# Check if the entry got removed or disabled, in which case we shouldn't reconnect
if self._entry.entry_id not in self._hass.data[DOMAIN]:
# When removing/disconnecting manually
return
device_registry = await hass.helpers.device_registry.async_get_registry()
devices = dr.async_entries_for_config_entry(device_registry, entry.entry_id)
device_registry = self._hass.helpers.device_registry.async_get(self._hass)
devices = dr.async_entries_for_config_entry(
device_registry, self._entry.entry_id
)
for device in devices:
# There is only one device in ESPHome
if device.disabled:
# Don't attempt to connect if it's disabled
return
data: RuntimeEntryData = hass.data[DOMAIN][entry.entry_id]
for disconnect_cb in data.disconnect_callbacks:
disconnect_cb()
data.disconnect_callbacks = []
data.available = False
data.async_update_device_state(hass)
if is_disconnect:
# This can happen often depending on WiFi signal strength.
# So therefore all these connection warnings are logged
# as infos. The "unavailable" logic will still trigger so the
# user knows if the device is not connected.
_LOGGER.info("Disconnected from ESPHome API for %s", host)
if tries != 0:
# If not first re-try, wait and print message
# Cap wait time at 1 minute. This is because while working on the
# device (e.g. soldering stuff), users don't want to have to wait
# a long time for their device to show up in HA again (this was
# mentioned a lot in early feedback)
#
# In the future another API will be set up so that the ESP can
# notify HA of connectivity directly, but for new we'll use a
# really short reconnect interval.
tries = min(tries, 10) # prevent OverflowError
wait_time = int(round(min(1.8 ** tries, 60.0)))
if tries == 1:
_LOGGER.info("Trying to reconnect to %s in the background", host)
_LOGGER.debug("Retrying %s in %d seconds", host, wait_time)
await asyncio.sleep(wait_time)
await self._try_connect()
async def _reconnect_loop(self):
while True:
try:
await cli.connect(on_stop=try_connect, login=True)
except APIConnectionError as error:
level = logging.WARNING if tries == 0 else logging.DEBUG
_LOGGER.log(
level,
"Can't connect to ESPHome API for %s (%s): %s",
entry.unique_id,
host,
error,
)
# Schedule re-connect in event loop in order not to delay HA
# startup. First connect is scheduled in tracked tasks.
data.reconnect_task = hass.loop.create_task(
try_connect(tries + 1, is_disconnect=False)
)
else:
_LOGGER.info("Successfully connected to %s", host)
hass.async_create_task(on_login())
await self._reconnect_once()
except asyncio.CancelledError: # pylint: disable=try-except-raise
raise
except Exception: # pylint: disable=broad-except
_LOGGER.error("Caught exception while reconnecting", exc_info=True)
return try_connect
async def start(self):
"""Start the reconnecting logic background task."""
# Create reconnection loop outside of HA's tracked tasks in order
# not to delay startup.
self._loop_task = self._hass.loop.create_task(self._reconnect_loop())
# Listen for mDNS records so we can reconnect directly if a received mDNS record
# indicates the node is up again
await self._hass.async_add_executor_job(self._zc.add_listener, self, None)
async with self._connected_lock:
self._connected = False
self._reconnect_event.set()
async def stop(self):
"""Stop the reconnecting logic background task. Does not disconnect the client."""
if self._loop_task is not None:
self._loop_task.cancel()
self._loop_task = None
await self._hass.async_add_executor_job(self._zc.remove_listener, self)
async with self._wait_task_lock:
if self._wait_task is not None:
self._wait_task.cancel()
self._wait_task = None
@callback
def stop_callback(self):
"""Stop as an async callback function."""
self._hass.async_create_task(self.stop())
@callback
def _set_reconnect(self):
self._reconnect_event.set()
def update_record(self, zc: Zeroconf, now: float, record: DNSRecord) -> None:
"""Listen to zeroconf updated mDNS records."""
if not isinstance(record, DNSPointer):
# We only consider PTR records and match using the alias name
return
if self._entry_data is None or self._entry_data.device_info is None:
# Either the entry was already teared down or we haven't received device info yet
return
filter_alias = f"{self._entry_data.device_info.name}._esphomelib._tcp.local."
if record.alias != filter_alias:
return
# This is a mDNS record from the device and could mean it just woke up
# Check if already connected, no lock needed for this access
if self._connected:
return
# Tell reconnection logic to retry connection attempt now (even before reconnect timer finishes)
_LOGGER.debug(
"%s: Triggering reconnect because of received mDNS record %s",
self._host,
record,
)
self._hass.add_job(self._set_reconnect)
async def _async_setup_device_registry(
@ -421,8 +567,6 @@ async def _cleanup_instance(
) -> RuntimeEntryData:
"""Cleanup the esphome client if it exists."""
data: RuntimeEntryData = hass.data[DOMAIN].pop(entry.entry_id)
if data.reconnect_task is not None:
data.reconnect_task.cancel()
for disconnect_cb in data.disconnect_callbacks:
disconnect_cb()
for cleanup_callback in data.cleanup_callbacks:

1
homeassistant/components/esphome/entry_data.py
View file

@ -54,7 +54,6 @@ class RuntimeEntryData:
entry_id: str = attr.ib()
client: APIClient = attr.ib()
store: Store = attr.ib()
reconnect_task: asyncio.Task | None = attr.ib(default=None)
state: dict[str, dict[str, Any]] = attr.ib(factory=dict)
info: dict[str, dict[str, Any]] = attr.ib(factory=dict)