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Refactor reconnect logic to reduce complexity (#426)

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J. Nick Koston 2023-04-25 15:11:40 -05:00 committed by GitHub
parent 3f29ac92ad
commit de9b7266f1
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3 changed files with 121 additions and 147 deletions
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5
aioesphomeapi/client.py
View File

@ -255,6 +255,11 @@ class APIClient:
return f"{self._cached_name} @ {self.address}"
return self.address
def set_cached_name_if_unset(self, name: str) -> None:
"""Set the cached name of the device if not set."""
if not self._cached_name:
self._cached_name = name
async def connect(
self,
on_stop: Optional[Callable[[bool], Awaitable[None]]] = None,

7
aioesphomeapi/connection.py
View File

@ -190,7 +190,8 @@ class APIConnection:
# Ensure on_stop is called only once
self._on_stop_task = asyncio.create_task(
self.on_stop(self._expected_disconnect)
self.on_stop(self._expected_disconnect),
name=f"{self.log_name} aioesphomeapi connection on_stop",
)
self._on_stop_task.add_done_callback(_remove_on_stop_task)
self.on_stop = None
@ -405,7 +406,9 @@ class APIConnection:
if login:
await self.login(check_connected=False)
self._connect_task = asyncio.create_task(_do_connect())
self._connect_task = asyncio.create_task(
_do_connect(), name=f"{self.log_name}: aioesphomeapi do_connect"
)
try:
# Allow 2 minutes for connect; this is only as a last measure

256
aioesphomeapi/reconnect_logic.py
View File

@ -38,35 +38,26 @@ class ReconnectLogic(zeroconf.RecordUpdateListener):
:param on_connect: Coroutine Function to call when connected.
:param on_disconnect: Coroutine Function to call when disconnected.
"""
self.loop = asyncio.get_event_loop()
self._cli = client
self.name = name
self._on_connect_cb = on_connect
self._on_disconnect_cb = on_disconnect
self._on_connect_error_cb = on_connect_error
self._zc = zeroconf_instance
self._filter_alias: Optional[str] = None
# Flag to check if the device is connected
self._connected = True
self._connected = False
self._connected_lock = asyncio.Lock()
self._zc_lock = asyncio.Lock()
self._is_stopped = True
self._zc_listening = False
# 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: Optional[asyncio.Task[None]] = None
# How many reconnect attempts have there been already, used for exponential wait time
# How many connect 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 shutdown
self._wait_task: Optional[asyncio.Task[None]] = None
self._wait_task_lock = asyncio.Lock()
# Event for tracking when logic should stop
self._stop_event = asyncio.Event()
self._connect_task: Optional[asyncio.Task[None]] = None
self._connect_timer: Optional[asyncio.TimerHandle] = None
self._stop_task: Optional[asyncio.Task[None]] = None
@property
def _is_stopped(self) -> bool:
return self._stop_event.is_set()
@property
def _log_name(self) -> str:
if self.name is not None:
@ -91,59 +82,25 @@ class ReconnectLogic(zeroconf.RecordUpdateListener):
# Run disconnect hook
await self._on_disconnect_cb()
# 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
if expected_disconnect:
# If we expected the disconnect we need
# to cooldown before reconnecting in case the remote
# is rebooting so we don't establish a connection right
# before its about to reboot in the event we are too fast.
await asyncio.sleep(EXPECTED_DISCONNECT_COOLDOWN)
wait = EXPECTED_DISCONNECT_COOLDOWN if expected_disconnect else 0
# If we expected the disconnect we need
# to cooldown before connecting in case the remote
# is rebooting so we don't establish a connection right
# before its about to reboot in the event we are too fast.
self._schedule_connect(wait)
self._reconnect_event.set()
# Start listening for zeroconf records
# only after setting the reconnect_event
# since we only want to accept zeroconf records
# after the reconnect has failed.
await self._start_zc_listen()
async def _wait_and_start_reconnect(self) -> None:
"""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._log_name)
_LOGGER.debug("Retrying %s in %d seconds", self._log_name, 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) -> None:
async def _try_connect(self) -> bool:
"""Try connecting to the API client."""
async with self._tries_lock:
tries = self._tries
self._tries += 1
assert self._connected_lock.locked(), "connected_lock must be locked"
try:
await self._cli.connect(on_stop=self._on_disconnect, login=True)
except Exception as err: # pylint: disable=broad-except
if self._on_connect_error_cb is not None:
await self._on_connect_error_cb(err)
level = logging.WARNING if tries == 0 else logging.DEBUG
level = logging.WARNING if self._tries == 0 else logging.DEBUG
_LOGGER.log(
level,
"Can't connect to ESPHome API for %s: %s",
@ -152,104 +109,119 @@ class ReconnectLogic(zeroconf.RecordUpdateListener):
# Print stacktrace if unhandled (not APIConnectionError)
exc_info=not isinstance(err, APIConnectionError),
)
await self._start_zc_listen()
# 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._tries += 1
return False
_LOGGER.info("Successfully connected to %s", self._log_name)
self._connected = True
self._tries = 0
await self._on_connect_cb()
return True
self._wait_task = asyncio.create_task(self._wait_and_start_reconnect())
else:
_LOGGER.info("Successfully connected to %s", self._log_name)
async with self._tries_lock:
self._tries = 0
async with self._connected_lock:
self._connected = True
await self._stop_zc_listen()
await self._on_connect_cb()
async def _reconnect_once(self) -> None:
# 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
if self._is_stopped:
def _schedule_connect(self, delay: float) -> None:
"""Schedule a connect attempt."""
self._cancel_connect()
if not delay:
self._call_connect_once()
return
self._connect_timer = self.loop.call_later(delay, self._call_connect_once)
await self._try_connect()
def _call_connect_once(self) -> None:
"""Call the connect logic once.
async def _reconnect_loop(self) -> None:
while True:
try:
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 to %s",
self._log_name,
exc_info=True,
)
Must only be called from _schedule_connect.
"""
self._connect_task = asyncio.create_task(
self._connect_once_or_reschedule(),
name=f"{self._log_name}: aioesphomeapi connect",
)
async def start(self) -> None:
"""Start the reconnecting logic background task."""
# Create reconnection loop outside of HA's tracked tasks in order
# not to delay startup.
self._loop_task = asyncio.create_task(self._reconnect_loop())
def _cancel_connect(self) -> None:
"""Cancel the connect."""
if self._connect_timer:
self._connect_timer.cancel()
self._connect_timer = None
if self._connect_task:
self._connect_task.cancel()
self._connect_task = None
async def _connect_once_or_reschedule(self) -> None:
"""Connect once or schedule connect.
Must only be called from _call_connect_once
"""
async with self._connected_lock:
self._connected = False
self._reconnect_event.set()
async def stop(self) -> None:
"""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
async with self._wait_task_lock:
if self._wait_task is not None:
self._wait_task.cancel()
self._wait_task = None
await self._stop_zc_listen()
self._stop_zc_listen()
if self._connected or self._is_stopped:
return
if await self._try_connect():
return
tries = min(self._tries, 10) # prevent OverflowError
wait_time = int(round(min(1.8**tries, 60.0)))
if tries == 1:
_LOGGER.info(
"Trying to connect to %s in the background", self._log_name
)
_LOGGER.debug("Retrying %s in %d seconds", self._log_name, wait_time)
if wait_time:
# If we are waiting, start listening for mDNS records
self._start_zc_listen()
self._schedule_connect(wait_time)
def stop_callback(self) -> None:
def _remove_stop_task(_fut: asyncio.Future[None]) -> None:
"""Remove the stop task from the reconnect loop.
"""Stop the connect logic."""
def _remove_stop_task(_fut: asyncio.Future[None]) -> None:
"""Remove the stop task from the connect loop.
We need to do this because the asyncio does not hold
a strong reference to the task, so it can be garbage
collected unexpectedly.
"""
self._stop_task = None
self._stop_task = asyncio.create_task(self.stop())
self._stop_task = asyncio.create_task(
self.stop(),
name=f"{self._log_name}: aioesphomeapi reconnect_logic stop_callback",
)
self._stop_task.add_done_callback(_remove_stop_task)
async def _start_zc_listen(self) -> None:
async def start(self) -> None:
"""Start the connecting logic background task."""
if self.name:
self._cli.set_cached_name_if_unset(self.name)
async with self._connected_lock:
self._is_stopped = False
if self._connected:
return
self._tries = 0
self._schedule_connect(0.0)
async def stop(self) -> None:
"""Stop the connecting logic background task. Does not disconnect the client."""
self._cancel_connect()
async with self._connected_lock:
self._is_stopped = True
# Cancel again while holding the lock
self._cancel_connect()
self._stop_zc_listen()
def _start_zc_listen(self) -> None:
"""Listen for mDNS records.
This listener allows us to schedule a reconnect as soon as a
This listener allows us to schedule a connect as soon as a
received mDNS record indicates the node is up again.
"""
async with self._zc_lock:
if not self._zc_listening:
self._zc.async_add_listener(self, None)
self._zc_listening = True
if not self._zc_listening and self.name:
_LOGGER.debug("Starting zeroconf listener for %s", self.name)
self._filter_alias = f"{self.name}._esphomelib._tcp.local."
self._zc.async_add_listener(self, None)
self._zc_listening = True
async def _stop_zc_listen(self) -> None:
def _stop_zc_listen(self) -> None:
"""Stop listening for zeroconf updates."""
async with self._zc_lock:
if self._zc_listening:
self._zc.async_remove_listener(self)
self._zc_listening = False
if self._zc_listening:
_LOGGER.debug("Removing zeroconf listener for %s", self.name)
self._zc.async_remove_listener(self)
self._zc_listening = False
def async_update_records(
self,
@ -264,29 +236,23 @@ class ReconnectLogic(zeroconf.RecordUpdateListener):
# Check if already connected, no lock needed for this access and
# bail if either the already stopped or we haven't received device info yet
if (
self._connected
or self._reconnect_event.is_set()
or self._is_stopped
or self.name is None
):
if self._connected or self._is_stopped or self._filter_alias is None:
return
filter_alias = f"{self.name}._esphomelib._tcp.local."
for record_update in records:
# We only consider PTR records and match using the alias name
if (
not isinstance(record_update.new, zeroconf.DNSPointer) # type: ignore[attr-defined]
or record_update.new.alias != filter_alias
or record_update.new.alias != self._filter_alias
):
continue
# Tell reconnection logic to retry connection attempt now (even before reconnect timer finishes)
# Tell connection logic to retry connection attempt now (even before connect timer finishes)
_LOGGER.debug(
"%s: Triggering reconnect because of received mDNS record %s",
"%s: Triggering connect because of received mDNS record %s",
self._log_name,
record_update.new,
)
self._reconnect_event.set()
self._stop_zc_listen()
self._schedule_connect(0.0)
return