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core/homeassistant/components/mqtt/client.py

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"""Support for MQTT message handling."""
from __future__ import annotations
import asyncio
from collections import defaultdict
from collections.abc import AsyncGenerator, Callable, Coroutine, Iterable
import contextlib
from dataclasses import dataclass
from functools import lru_cache, partial
from itertools import chain, groupby
import logging
from operator import attrgetter
import socket
import ssl
import time
from typing import TYPE_CHECKING, Any
import uuid
import certifi
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
CONF_CLIENT_ID,
CONF_PASSWORD,
CONF_PORT,
CONF_PROTOCOL,
CONF_USERNAME,
EVENT_HOMEASSISTANT_STOP,
)
from homeassistant.core import (
CALLBACK_TYPE,
Event,
HassJob,
HassJobType,
HomeAssistant,
callback,
get_hassjob_callable_job_type,
)
from homeassistant.exceptions import HomeAssistantError
from homeassistant.helpers.dispatcher import async_dispatcher_send
from homeassistant.helpers.importlib import async_import_module
from homeassistant.helpers.start import async_at_started
from homeassistant.helpers.typing import ConfigType
from homeassistant.loader import bind_hass
from homeassistant.setup import SetupPhases, async_pause_setup
from homeassistant.util.collection import chunked_or_all
from homeassistant.util.logging import catch_log_exception, log_exception
from .const import (
CONF_BIRTH_MESSAGE,
CONF_BROKER,
CONF_CERTIFICATE,
CONF_CLIENT_CERT,
CONF_CLIENT_KEY,
CONF_KEEPALIVE,
CONF_TLS_INSECURE,
CONF_TRANSPORT,
CONF_WILL_MESSAGE,
CONF_WS_HEADERS,
CONF_WS_PATH,
DEFAULT_BIRTH,
DEFAULT_ENCODING,
DEFAULT_KEEPALIVE,
DEFAULT_PORT,
DEFAULT_PROTOCOL,
DEFAULT_QOS,
DEFAULT_TRANSPORT,
DEFAULT_WILL,
DEFAULT_WS_HEADERS,
DEFAULT_WS_PATH,
DOMAIN,
MQTT_CONNECTION_STATE,
PROTOCOL_5,
PROTOCOL_31,
TRANSPORT_WEBSOCKETS,
)
from .models import (
DATA_MQTT,
MessageCallbackType,
MqttData,
PublishMessage,
PublishPayloadType,
ReceiveMessage,
)
from .util import EnsureJobAfterCooldown, get_file_path, mqtt_config_entry_enabled
if TYPE_CHECKING:
# Only import for paho-mqtt type checking here, imports are done locally
# because integrations should be able to optionally rely on MQTT.
import paho.mqtt.client as mqtt
from .async_client import AsyncMQTTClient
_LOGGER = logging.getLogger(__name__)
MIN_BUFFER_SIZE = 131072 # Minimum buffer size to use if preferred size fails
PREFERRED_BUFFER_SIZE = 8 * 1024 * 1024 # Set receive buffer size to 8MiB
DISCOVERY_COOLDOWN = 5
# The initial subscribe cooldown controls how long to wait to group
# subscriptions together. This is to avoid making too many subscribe
# requests in a short period of time. If the number is too low, the
# system will be flooded with subscribe requests. If the number is too
# high, we risk being flooded with responses to the subscribe requests
# which can exceed the receive buffer size of the socket. To mitigate
# this, we increase the receive buffer size of the socket as well.
INITIAL_SUBSCRIBE_COOLDOWN = 0.5
SUBSCRIBE_COOLDOWN = 0.1
UNSUBSCRIBE_COOLDOWN = 0.1
TIMEOUT_ACK = 10
RECONNECT_INTERVAL_SECONDS = 10
MAX_WILDCARD_SUBSCRIBES_PER_CALL = 1
MAX_SUBSCRIBES_PER_CALL = 500
MAX_UNSUBSCRIBES_PER_CALL = 500
MAX_PACKETS_TO_READ = 500
type SocketType = socket.socket | ssl.SSLSocket | mqtt.WebsocketWrapper | Any
type SubscribePayloadType = str | bytes # Only bytes if encoding is None
def publish(
hass: HomeAssistant,
topic: str,
payload: PublishPayloadType,
qos: int | None = 0,
retain: bool | None = False,
encoding: str | None = DEFAULT_ENCODING,
) -> None:
"""Publish message to a MQTT topic."""
hass.create_task(async_publish(hass, topic, payload, qos, retain, encoding))
async def async_publish(
hass: HomeAssistant,
topic: str,
payload: PublishPayloadType,
qos: int | None = 0,
retain: bool | None = False,
encoding: str | None = DEFAULT_ENCODING,
) -> None:
"""Publish message to a MQTT topic."""
if not mqtt_config_entry_enabled(hass):
raise HomeAssistantError(
f"Cannot publish to topic '{topic}', MQTT is not enabled",
translation_key="mqtt_not_setup_cannot_publish",
translation_domain=DOMAIN,
translation_placeholders={"topic": topic},
)
mqtt_data = hass.data[DATA_MQTT]
outgoing_payload = payload
if not isinstance(payload, bytes) and payload is not None:
if not encoding:
_LOGGER.error(
(
"Can't pass-through payload for publishing %s on %s with no"
" encoding set, need 'bytes' got %s"
),
payload,
topic,
type(payload),
)
return
outgoing_payload = str(payload)
if encoding != DEFAULT_ENCODING:
# A string is encoded as utf-8 by default, other encoding
# requires bytes as payload
try:
outgoing_payload = outgoing_payload.encode(encoding)
except (AttributeError, LookupError, UnicodeEncodeError):
_LOGGER.error(
"Can't encode payload for publishing %s on %s with encoding %s",
payload,
topic,
encoding,
)
return
await mqtt_data.client.async_publish(
topic, outgoing_payload, qos or 0, retain or False
)
@bind_hass
async def async_subscribe(
hass: HomeAssistant,
topic: str,
msg_callback: Callable[[ReceiveMessage], Coroutine[Any, Any, None] | None],
qos: int = DEFAULT_QOS,
encoding: str | None = DEFAULT_ENCODING,
) -> CALLBACK_TYPE:
"""Subscribe to an MQTT topic.
Call the return value to unsubscribe.
"""
return async_subscribe_internal(hass, topic, msg_callback, qos, encoding)
@callback
def async_subscribe_internal(
hass: HomeAssistant,
topic: str,
msg_callback: Callable[[ReceiveMessage], Coroutine[Any, Any, None] | None],
qos: int = DEFAULT_QOS,
encoding: str | None = DEFAULT_ENCODING,
job_type: HassJobType | None = None,
) -> CALLBACK_TYPE:
"""Subscribe to an MQTT topic.
This function is internal to the MQTT integration
and may change at any time. It should not be considered
a stable API.
Call the return value to unsubscribe.
"""
try:
mqtt_data = hass.data[DATA_MQTT]
except KeyError as exc:
raise HomeAssistantError(
f"Cannot subscribe to topic '{topic}', "
"make sure MQTT is set up correctly",
translation_key="mqtt_not_setup_cannot_subscribe",
translation_domain=DOMAIN,
translation_placeholders={"topic": topic},
) from exc
client = mqtt_data.client
if not client.connected and not mqtt_config_entry_enabled(hass):
raise HomeAssistantError(
f"Cannot subscribe to topic '{topic}', MQTT is not enabled",
translation_key="mqtt_not_setup_cannot_subscribe",
translation_domain=DOMAIN,
translation_placeholders={"topic": topic},
)
return client.async_subscribe(topic, msg_callback, qos, encoding, job_type)
@bind_hass
def subscribe(
hass: HomeAssistant,
topic: str,
msg_callback: MessageCallbackType,
qos: int = DEFAULT_QOS,
encoding: str = "utf-8",
) -> Callable[[], None]:
"""Subscribe to an MQTT topic."""
async_remove = asyncio.run_coroutine_threadsafe(
async_subscribe(hass, topic, msg_callback, qos, encoding), hass.loop
).result()
def remove() -> None:
"""Remove listener convert."""
# MQTT messages tend to be high volume,
# and since they come in via a thread and need to be processed in the event loop,
# we want to avoid hass.add_job since most of the time is spent calling
# inspect to figure out how to run the callback.
hass.loop.call_soon_threadsafe(async_remove)
return remove
@dataclass(slots=True, frozen=True)
class Subscription:
"""Class to hold data about an active subscription."""
topic: str
is_simple_match: bool
complex_matcher: Callable[[str], bool] | None
job: HassJob[[ReceiveMessage], Coroutine[Any, Any, None] | None]
qos: int = 0
encoding: str | None = "utf-8"
class MqttClientSetup:
"""Helper class to setup the paho mqtt client from config."""
_client: AsyncMQTTClient
def __init__(self, config: ConfigType) -> None:
"""Initialize the MQTT client setup helper.
self.setup must be run in an executor job.
"""
self._config = config
def setup(self) -> None:
"""Set up the MQTT client.
The setup of the MQTT client should be run in an executor job,
because it accesses files, so it does IO.
"""
# We don't import on the top because some integrations
# should be able to optionally rely on MQTT.
import paho.mqtt.client as mqtt # pylint: disable=import-outside-toplevel
# pylint: disable-next=import-outside-toplevel
from .async_client import AsyncMQTTClient
config = self._config
if (protocol := config.get(CONF_PROTOCOL, DEFAULT_PROTOCOL)) == PROTOCOL_31:
proto = mqtt.MQTTv31
elif protocol == PROTOCOL_5:
proto = mqtt.MQTTv5
else:
proto = mqtt.MQTTv311
if (client_id := config.get(CONF_CLIENT_ID)) is None:
# PAHO MQTT relies on the MQTT server to generate random client IDs.
# However, that feature is not mandatory so we generate our own.
client_id = mqtt.base62(uuid.uuid4().int, padding=22)
transport: str = config.get(CONF_TRANSPORT, DEFAULT_TRANSPORT)
self._client = AsyncMQTTClient(
client_id,
protocol=proto,
transport=transport,
reconnect_on_failure=False,
)
self._client.setup()
# Enable logging
self._client.enable_logger()
username: str | None = config.get(CONF_USERNAME)
password: str | None = config.get(CONF_PASSWORD)
if username is not None:
self._client.username_pw_set(username, password)
if (
certificate := get_file_path(CONF_CERTIFICATE, config.get(CONF_CERTIFICATE))
) == "auto":
certificate = certifi.where()
client_key = get_file_path(CONF_CLIENT_KEY, config.get(CONF_CLIENT_KEY))
client_cert = get_file_path(CONF_CLIENT_CERT, config.get(CONF_CLIENT_CERT))
tls_insecure = config.get(CONF_TLS_INSECURE)
if transport == TRANSPORT_WEBSOCKETS:
ws_path: str = config.get(CONF_WS_PATH, DEFAULT_WS_PATH)
ws_headers: dict[str, str] = config.get(CONF_WS_HEADERS, DEFAULT_WS_HEADERS)
self._client.ws_set_options(ws_path, ws_headers)
if certificate is not None:
self._client.tls_set(
certificate,
certfile=client_cert,
keyfile=client_key,
tls_version=ssl.PROTOCOL_TLS_CLIENT,
)
if tls_insecure is not None:
self._client.tls_insecure_set(tls_insecure)
@property
def client(self) -> AsyncMQTTClient:
"""Return the paho MQTT client."""
return self._client
class MQTT:
"""Home Assistant MQTT client."""
_mqttc: AsyncMQTTClient
_last_subscribe: float
_mqtt_data: MqttData
def __init__(
self, hass: HomeAssistant, config_entry: ConfigEntry, conf: ConfigType
) -> None:
"""Initialize Home Assistant MQTT client."""
self.hass = hass
self.loop = hass.loop
self.config_entry = config_entry
self.conf = conf
self._simple_subscriptions: defaultdict[str, set[Subscription]] = defaultdict(
set
)
# To ensure the wildcard subscriptions order is preserved, we use a dict
# with `None` values instead of a set.
self._wildcard_subscriptions: dict[Subscription, None] = {}
# _retained_topics prevents a Subscription from receiving a
# retained message more than once per topic. This prevents flooding
# already active subscribers when new subscribers subscribe to a topic
# which has subscribed messages.
self._retained_topics: defaultdict[Subscription, set[str]] = defaultdict(set)
self.connected = False
self._ha_started = asyncio.Event()
self._cleanup_on_unload: list[Callable[[], None]] = []
self._connection_lock = asyncio.Lock()
self._pending_operations: dict[int, asyncio.Future[None]] = {}
self._subscribe_debouncer = EnsureJobAfterCooldown(
INITIAL_SUBSCRIBE_COOLDOWN, self._async_perform_subscriptions
)
self._misc_timer: asyncio.TimerHandle | None = None
self._reconnect_task: asyncio.Task | None = None
self._should_reconnect: bool = True
self._available_future: asyncio.Future[bool] | None = None
self._max_qos: defaultdict[str, int] = defaultdict(int) # topic, max qos
self._pending_subscriptions: dict[str, int] = {} # topic, qos
self._unsubscribe_debouncer = EnsureJobAfterCooldown(
UNSUBSCRIBE_COOLDOWN, self._async_perform_unsubscribes
)
self._pending_unsubscribes: set[str] = set() # topic
self._cleanup_on_unload.extend(
(
async_at_started(hass, self._async_ha_started),
hass.bus.async_listen(EVENT_HOMEASSISTANT_STOP, self._async_ha_stop),
)
)
self._socket_buffersize: int | None = None
@callback
def _async_ha_started(self, _hass: HomeAssistant) -> None:
"""Handle HA started."""
self._ha_started.set()
async def _async_ha_stop(self, _event: Event) -> None:
"""Handle HA stop."""
await self.async_disconnect()
async def async_start(
self,
mqtt_data: MqttData,
) -> None:
"""Start Home Assistant MQTT client."""
self._mqtt_data = mqtt_data
await self.async_init_client()
@property
def subscriptions(self) -> set[Subscription]:
"""Return the tracked subscriptions."""
return {
*chain.from_iterable(self._simple_subscriptions.values()),
*self._wildcard_subscriptions,
}
def cleanup(self) -> None:
"""Clean up listeners."""
while self._cleanup_on_unload:
self._cleanup_on_unload.pop()()
@contextlib.asynccontextmanager
async def _async_connect_in_executor(self) -> AsyncGenerator[None]:
# While we are connecting in the executor we need to
# handle on_socket_open and on_socket_register_write
# in the executor as well.
mqttc = self._mqttc
try:
mqttc.on_socket_open = self._on_socket_open
mqttc.on_socket_register_write = self._on_socket_register_write
yield
finally:
# Once the executor job is done, we can switch back to
# handling these in the event loop.
mqttc.on_socket_open = self._async_on_socket_open
mqttc.on_socket_register_write = self._async_on_socket_register_write
async def async_init_client(self) -> None:
"""Initialize paho client."""
with async_pause_setup(self.hass, SetupPhases.WAIT_IMPORT_PACKAGES):
await async_import_module(
self.hass, "homeassistant.components.mqtt.async_client"
)
mqttc_setup = MqttClientSetup(self.conf)
await self.hass.async_add_executor_job(mqttc_setup.setup)
mqttc = mqttc_setup.client
# on_socket_unregister_write and _async_on_socket_close
# are only ever called in the event loop
mqttc.on_socket_close = self._async_on_socket_close
mqttc.on_socket_unregister_write = self._async_on_socket_unregister_write
# These will be called in the event loop
mqttc.on_connect = self._async_mqtt_on_connect
mqttc.on_disconnect = self._async_mqtt_on_disconnect
mqttc.on_message = self._async_mqtt_on_message
mqttc.on_publish = self._async_mqtt_on_callback
mqttc.on_subscribe = self._async_mqtt_on_callback
mqttc.on_unsubscribe = self._async_mqtt_on_callback
# suppress exceptions at callback
mqttc.suppress_exceptions = True
if will := self.conf.get(CONF_WILL_MESSAGE, DEFAULT_WILL):
will_message = PublishMessage(**will)
mqttc.will_set(
topic=will_message.topic,
payload=will_message.payload,
qos=will_message.qos,
retain=will_message.retain,
)
self._mqttc = mqttc
@callback
def _async_reader_callback(self, client: mqtt.Client) -> None:
"""Handle reading data from the socket."""
if (status := client.loop_read(MAX_PACKETS_TO_READ)) != 0:
self._async_on_disconnect(status)
@callback
def _async_start_misc_periodic(self) -> None:
"""Start the misc periodic."""
assert self._misc_timer is None, "Misc periodic already started"
_LOGGER.debug("%s: Starting client misc loop", self.config_entry.title)
# pylint: disable=import-outside-toplevel
import paho.mqtt.client as mqtt
# Inner function to avoid having to check late import
# each time the function is called.
@callback
def _async_misc() -> None:
"""Start the MQTT client misc loop."""
if self._mqttc.loop_misc() == mqtt.MQTT_ERR_SUCCESS:
self._misc_timer = self.loop.call_at(self.loop.time() + 1, _async_misc)
self._misc_timer = self.loop.call_at(self.loop.time() + 1, _async_misc)
def _increase_socket_buffer_size(self, sock: SocketType) -> None:
"""Increase the socket buffer size."""
if not hasattr(sock, "setsockopt") and hasattr(sock, "_socket"):
# The WebsocketWrapper does not wrap setsockopt
# so we need to get the underlying socket
# Remove this once
# https://github.com/eclipse/paho.mqtt.python/pull/843
# is available.
sock = sock._socket # noqa: SLF001
new_buffer_size = PREFERRED_BUFFER_SIZE
while True:
try:
# Some operating systems do not allow us to set the preferred
# buffer size. In that case we try some other size options.
sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, new_buffer_size)
except OSError as err:
if new_buffer_size <= MIN_BUFFER_SIZE:
_LOGGER.warning(
"Unable to increase the socket buffer size to %s; "
"The connection may be unstable if the MQTT broker "
"sends data at volume or a large amount of subscriptions "
"need to be processed: %s",
new_buffer_size,
err,
)
return
new_buffer_size //= 2
else:
return
def _on_socket_open(
self, client: mqtt.Client, userdata: Any, sock: SocketType
) -> None:
"""Handle socket open."""
self.loop.call_soon_threadsafe(
self._async_on_socket_open, client, userdata, sock
)
@callback
def _async_on_socket_open(
self, client: mqtt.Client, userdata: Any, sock: SocketType
) -> None:
"""Handle socket open."""
fileno = sock.fileno()
_LOGGER.debug("%s: connection opened %s", self.config_entry.title, fileno)
if fileno > -1:
self._increase_socket_buffer_size(sock)
self.loop.add_reader(sock, partial(self._async_reader_callback, client))
if not self._misc_timer:
self._async_start_misc_periodic()
# Try to consume the buffer right away so it doesn't fill up
# since add_reader will wait for the next loop iteration
self._async_reader_callback(client)
@callback
def _async_on_socket_close(
self, client: mqtt.Client, userdata: Any, sock: SocketType
) -> None:
"""Handle socket close."""
fileno = sock.fileno()
_LOGGER.debug("%s: connection closed %s", self.config_entry.title, fileno)
# If socket close is called before the connect
# result is set make sure the first connection result is set
self._async_connection_result(False)
if fileno > -1:
self.loop.remove_reader(sock)
if self._misc_timer:
self._misc_timer.cancel()
self._misc_timer = None
@callback
def _async_writer_callback(self, client: mqtt.Client) -> None:
"""Handle writing data to the socket."""
if (status := client.loop_write()) != 0:
self._async_on_disconnect(status)
def _on_socket_register_write(
self, client: mqtt.Client, userdata: Any, sock: SocketType
) -> None:
"""Register the socket for writing."""
self.loop.call_soon_threadsafe(
self._async_on_socket_register_write, client, None, sock
)
@callback
def _async_on_socket_register_write(
self, client: mqtt.Client, userdata: Any, sock: SocketType
) -> None:
"""Register the socket for writing."""
fileno = sock.fileno()
_LOGGER.debug("%s: register write %s", self.config_entry.title, fileno)
if fileno > -1:
self.loop.add_writer(sock, partial(self._async_writer_callback, client))
@callback
def _async_on_socket_unregister_write(
self, client: mqtt.Client, userdata: Any, sock: SocketType
) -> None:
"""Unregister the socket for writing."""
fileno = sock.fileno()
_LOGGER.debug("%s: unregister write %s", self.config_entry.title, fileno)
if fileno > -1:
self.loop.remove_writer(sock)
def _is_active_subscription(self, topic: str) -> bool:
"""Check if a topic has an active subscription."""
return topic in self._simple_subscriptions or any(
other.topic == topic for other in self._wildcard_subscriptions
)
async def async_publish(
self, topic: str, payload: PublishPayloadType, qos: int, retain: bool
) -> None:
"""Publish a MQTT message."""
msg_info = self._mqttc.publish(topic, payload, qos, retain)
_LOGGER.debug(
"Transmitting%s message on %s: '%s', mid: %s, qos: %s",
" retained" if retain else "",
topic,
payload,
msg_info.mid,
qos,
)
await self._async_wait_for_mid_or_raise(msg_info.mid, msg_info.rc)
async def async_connect(self, client_available: asyncio.Future[bool]) -> None:
"""Connect to the host. Does not process messages yet."""
# pylint: disable-next=import-outside-toplevel
import paho.mqtt.client as mqtt
result: int | None = None
self._available_future = client_available
self._should_reconnect = True
try:
async with self._connection_lock, self._async_connect_in_executor():
result = await self.hass.async_add_executor_job(
self._mqttc.connect,
self.conf[CONF_BROKER],
self.conf.get(CONF_PORT, DEFAULT_PORT),
self.conf.get(CONF_KEEPALIVE, DEFAULT_KEEPALIVE),
)
except OSError as err:
_LOGGER.error("Failed to connect to MQTT server due to exception: %s", err)
self._async_connection_result(False)
finally:
if result is not None and result != 0:
if result is not None:
_LOGGER.error(
"Failed to connect to MQTT server: %s",
mqtt.error_string(result),
)
self._async_connection_result(False)
@callback
def _async_connection_result(self, connected: bool) -> None:
"""Handle a connection result."""
if self._available_future and not self._available_future.done():
self._available_future.set_result(connected)
if connected:
self._async_cancel_reconnect()
elif self._should_reconnect and not self._reconnect_task:
self._reconnect_task = self.config_entry.async_create_background_task(
self.hass, self._reconnect_loop(), "mqtt reconnect loop"
)
@callback
def _async_cancel_reconnect(self) -> None:
"""Cancel the reconnect task."""
if self._reconnect_task:
self._reconnect_task.cancel()
self._reconnect_task = None
async def _reconnect_loop(self) -> None:
"""Reconnect to the MQTT server."""
while True:
if not self.connected:
try:
async with self._connection_lock, self._async_connect_in_executor():
await self.hass.async_add_executor_job(self._mqttc.reconnect)
except OSError as err:
_LOGGER.debug(
"Error re-connecting to MQTT server due to exception: %s", err
)
await asyncio.sleep(RECONNECT_INTERVAL_SECONDS)
async def async_disconnect(self, disconnect_paho_client: bool = False) -> None:
"""Stop the MQTT client.
We only disconnect grafully if disconnect_paho_client is set, but not
when Home Assistant is shut down.
"""
# stop waiting for any pending subscriptions
await self._subscribe_debouncer.async_cleanup()
# reset timeout to initial subscribe cooldown
self._subscribe_debouncer.set_timeout(INITIAL_SUBSCRIBE_COOLDOWN)
# stop the unsubscribe debouncer
await self._unsubscribe_debouncer.async_cleanup()
# make sure the unsubscribes are processed
await self._async_perform_unsubscribes()
# wait for ACKs to be processed
if pending := self._pending_operations.values():
await asyncio.wait(pending)
# stop the MQTT loop
async with self._connection_lock:
self._should_reconnect = False
self._async_cancel_reconnect()
# We do not gracefully disconnect to ensure
# the broker publishes the will message unless the entry is reloaded
if disconnect_paho_client:
self._mqttc.disconnect()
@callback
def async_restore_tracked_subscriptions(
self, subscriptions: set[Subscription]
) -> None:
"""Restore tracked subscriptions after reload."""
for subscription in subscriptions:
self._async_track_subscription(subscription)
self._matching_subscriptions.cache_clear()
@callback
def _async_track_subscription(self, subscription: Subscription) -> None:
"""Track a subscription.
This method does not send a SUBSCRIBE message to the broker.
The caller is responsible clearing the cache of _matching_subscriptions.
"""
if subscription.is_simple_match:
self._simple_subscriptions[subscription.topic].add(subscription)
else:
self._wildcard_subscriptions[subscription] = None
@callback
def _async_untrack_subscription(self, subscription: Subscription) -> None:
"""Untrack a subscription.
This method does not send an UNSUBSCRIBE message to the broker.
The caller is responsible clearing the cache of _matching_subscriptions.
"""
topic = subscription.topic
try:
if subscription.is_simple_match:
simple_subscriptions = self._simple_subscriptions
simple_subscriptions[topic].remove(subscription)
if not simple_subscriptions[topic]:
del simple_subscriptions[topic]
else:
del self._wildcard_subscriptions[subscription]
except (KeyError, ValueError) as exc:
raise HomeAssistantError("Can't remove subscription twice") from exc
@callback
def _async_queue_subscriptions(
self, subscriptions: Iterable[tuple[str, int]], queue_only: bool = False
) -> None:
"""Queue requested subscriptions."""
for subscription in subscriptions:
topic, qos = subscription
if (max_qos := self._max_qos[topic]) < qos:
self._max_qos[topic] = (max_qos := qos)
self._pending_subscriptions[topic] = max_qos
# Cancel any pending unsubscribe since we are subscribing now
if topic in self._pending_unsubscribes:
self._pending_unsubscribes.remove(topic)
if queue_only:
return
self._subscribe_debouncer.async_schedule()
def _exception_message(
self,
msg_callback: Callable[[ReceiveMessage], Coroutine[Any, Any, None] | None],
msg: ReceiveMessage,
) -> str:
"""Return a string with the exception message."""
# if msg_callback is a partial we return the name of the first argument
if isinstance(msg_callback, partial):
call_back_name = getattr(msg_callback.args[0], "__name__")
else:
call_back_name = getattr(msg_callback, "__name__")
return (
f"Exception in {call_back_name} when handling msg on "
f"'{msg.topic}': '{msg.payload}'" # type: ignore[str-bytes-safe]
)
@callback
def async_subscribe(
self,
topic: str,
msg_callback: Callable[[ReceiveMessage], Coroutine[Any, Any, None] | None],
qos: int,
encoding: str | None = None,
job_type: HassJobType | None = None,
) -> Callable[[], None]:
"""Set up a subscription to a topic with the provided qos."""
if not isinstance(topic, str):
raise HomeAssistantError("Topic needs to be a string!")
if job_type is None:
job_type = get_hassjob_callable_job_type(msg_callback)
if job_type is not HassJobType.Callback:
# Only wrap the callback with catch_log_exception
# if it is not a simple callback since we catch
# exceptions for simple callbacks inline for
# performance reasons.
msg_callback = catch_log_exception(
msg_callback, partial(self._exception_message, msg_callback)
)
job = HassJob(msg_callback, job_type=job_type)
is_simple_match = not ("+" in topic or "#" in topic)
matcher = None if is_simple_match else _matcher_for_topic(topic)
subscription = Subscription(topic, is_simple_match, matcher, job, qos, encoding)
self._async_track_subscription(subscription)
self._matching_subscriptions.cache_clear()
# Only subscribe if currently connected.
if self.connected:
self._async_queue_subscriptions(((topic, qos),))
return partial(self._async_remove, subscription)
@callback
def _async_remove(self, subscription: Subscription) -> None:
"""Remove subscription."""
self._async_untrack_subscription(subscription)
self._matching_subscriptions.cache_clear()
if subscription in self._retained_topics:
del self._retained_topics[subscription]
# Only unsubscribe if currently connected
if self.connected:
self._async_unsubscribe(subscription.topic)
@callback
def _async_unsubscribe(self, topic: str) -> None:
"""Unsubscribe from a topic."""
if self._is_active_subscription(topic):
if self._max_qos[topic] == 0:
return
subs = self._matching_subscriptions(topic)
self._max_qos[topic] = max(sub.qos for sub in subs)
# Other subscriptions on topic remaining - don't unsubscribe.
return
if topic in self._max_qos:
del self._max_qos[topic]
if topic in self._pending_subscriptions:
# Avoid any pending subscription to be executed
del self._pending_subscriptions[topic]
self._pending_unsubscribes.add(topic)
self._unsubscribe_debouncer.async_schedule()
async def _async_perform_subscriptions(self) -> None:
"""Perform MQTT client subscriptions."""
# Section 3.3.1.3 in the specification:
# http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html
# When sending a PUBLISH Packet to a Client the Server MUST
# set the RETAIN flag to 1 if a message is sent as a result of a
# new subscription being made by a Client [MQTT-3.3.1-8].
# It MUST set the RETAIN flag to 0 when a PUBLISH Packet is sent to
# a Client because it matches an established subscription regardless
# of how the flag was set in the message it received [MQTT-3.3.1-9].
#
# Since we do not know if a published value is retained we need to
# (re)subscribe, to ensure retained messages are replayed
if not self._pending_subscriptions:
return
# Split out the wildcard subscriptions, we subscribe to them one by one
pending_subscriptions: dict[str, int] = self._pending_subscriptions
pending_wildcard_subscriptions = {
subscription.topic: pending_subscriptions.pop(subscription.topic)
for subscription in self._wildcard_subscriptions
if subscription.topic in pending_subscriptions
}
self._pending_subscriptions = {}
debug_enabled = _LOGGER.isEnabledFor(logging.DEBUG)
for chunk in chain(
chunked_or_all(
pending_wildcard_subscriptions.items(), MAX_WILDCARD_SUBSCRIBES_PER_CALL
),
chunked_or_all(pending_subscriptions.items(), MAX_SUBSCRIBES_PER_CALL),
):
chunk_list = list(chunk)
if not chunk_list:
continue
result, mid = self._mqttc.subscribe(chunk_list)
if debug_enabled:
_LOGGER.debug(
"Subscribing with mid: %s to topics with qos: %s", mid, chunk_list
)
self._last_subscribe = time.monotonic()
await self._async_wait_for_mid_or_raise(mid, result)
async def _async_perform_unsubscribes(self) -> None:
"""Perform pending MQTT client unsubscribes."""
if not self._pending_unsubscribes:
return
topics = list(self._pending_unsubscribes)
self._pending_unsubscribes = set()
debug_enabled = _LOGGER.isEnabledFor(logging.DEBUG)
for chunk in chunked_or_all(topics, MAX_UNSUBSCRIBES_PER_CALL):
chunk_list = list(chunk)
result, mid = self._mqttc.unsubscribe(chunk_list)
if debug_enabled:
_LOGGER.debug(
"Unsubscribing with mid: %s to topics: %s", mid, chunk_list
)
await self._async_wait_for_mid_or_raise(mid, result)
async def _async_resubscribe_and_publish_birth_message(
self, birth_message: PublishMessage
) -> None:
"""Resubscribe to all topics and publish birth message."""
self._async_queue_resubscribe()
self._subscribe_debouncer.async_schedule()
await self._ha_started.wait() # Wait for Home Assistant to start
await self._discovery_cooldown() # Wait for MQTT discovery to cool down
# Update subscribe cooldown period to a shorter time
# and make sure we flush the debouncer
await self._subscribe_debouncer.async_execute()
self._subscribe_debouncer.set_timeout(SUBSCRIBE_COOLDOWN)
await self.async_publish(
topic=birth_message.topic,
payload=birth_message.payload,
qos=birth_message.qos,
retain=birth_message.retain,
)
_LOGGER.info("MQTT client initialized, birth message sent")
@callback
def _async_mqtt_on_connect(
self,
_mqttc: mqtt.Client,
_userdata: None,
_flags: dict[str, int],
result_code: int,
properties: mqtt.Properties | None = None,
) -> None:
"""On connect callback.
Resubscribe to all topics we were subscribed to and publish birth
message.
"""
# pylint: disable-next=import-outside-toplevel
import paho.mqtt.client as mqtt
if result_code != mqtt.CONNACK_ACCEPTED:
if result_code in (
mqtt.CONNACK_REFUSED_BAD_USERNAME_PASSWORD,
mqtt.CONNACK_REFUSED_NOT_AUTHORIZED,
):
self._should_reconnect = False
self.hass.async_create_task(self.async_disconnect())
self.config_entry.async_start_reauth(self.hass)
_LOGGER.error(
"Unable to connect to the MQTT broker: %s",
mqtt.connack_string(result_code),
)
self._async_connection_result(False)
return
self.connected = True
async_dispatcher_send(self.hass, MQTT_CONNECTION_STATE, True)
_LOGGER.debug(
"Connected to MQTT server %s:%s (%s)",
self.conf[CONF_BROKER],
self.conf.get(CONF_PORT, DEFAULT_PORT),
result_code,
)
birth: dict[str, Any]
if birth := self.conf.get(CONF_BIRTH_MESSAGE, DEFAULT_BIRTH):
birth_message = PublishMessage(**birth)
self.config_entry.async_create_background_task(
self.hass,
self._async_resubscribe_and_publish_birth_message(birth_message),
name="mqtt re-subscribe and birth",
)
else:
# Update subscribe cooldown period to a shorter time
self._async_queue_resubscribe()
self._subscribe_debouncer.async_schedule()
self._async_connection_result(True)
@callback
def _async_queue_resubscribe(self) -> None:
"""Queue subscriptions on reconnect.
self._async_perform_subscriptions must be called
after this method to actually subscribe.
"""
self._max_qos.clear()
self._retained_topics.clear()
# Group subscriptions to only re-subscribe once for each topic.
keyfunc = attrgetter("topic")
self._async_queue_subscriptions(
[
# Re-subscribe with the highest requested qos
(topic, max(subscription.qos for subscription in subs))
for topic, subs in groupby(
sorted(self.subscriptions, key=keyfunc), keyfunc
)
],
queue_only=True,
)
@lru_cache(None) # pylint: disable=method-cache-max-size-none
def _matching_subscriptions(self, topic: str) -> list[Subscription]:
subscriptions: list[Subscription] = []
if topic in self._simple_subscriptions:
subscriptions.extend(self._simple_subscriptions[topic])
subscriptions.extend(
subscription
for subscription in self._wildcard_subscriptions
# mypy doesn't know that complex_matcher is always set when
# is_simple_match is False
if subscription.complex_matcher(topic) # type: ignore[misc]
)
return subscriptions
@callback
def _async_mqtt_on_message(
self, _mqttc: mqtt.Client, _userdata: None, msg: mqtt.MQTTMessage
) -> None:
try:
# msg.topic is a property that decodes the topic to a string
# every time it is accessed. Save the result to avoid
# decoding the same topic multiple times.
topic = msg.topic
except UnicodeDecodeError:
bare_topic: bytes = getattr(msg, "_topic")
_LOGGER.warning(
"Skipping received%s message on invalid topic %s (qos=%s): %s",
" retained" if msg.retain else "",
bare_topic,
msg.qos,
msg.payload[0:8192],
)
return
_LOGGER.debug(
"Received%s message on %s (qos=%s): %s",
" retained" if msg.retain else "",
topic,
msg.qos,
msg.payload[0:8192],
)
subscriptions = self._matching_subscriptions(topic)
msg_cache_by_subscription_topic: dict[str, ReceiveMessage] = {}
for subscription in subscriptions:
if msg.retain:
retained_topics = self._retained_topics[subscription]
# Skip if the subscription already received a retained message
if topic in retained_topics:
continue
# Remember the subscription had an initial retained message
self._retained_topics[subscription].add(topic)
payload: SubscribePayloadType = msg.payload
if subscription.encoding is not None:
try:
payload = msg.payload.decode(subscription.encoding)
except (AttributeError, UnicodeDecodeError):
_LOGGER.warning(
"Can't decode payload %s on %s with encoding %s (for %s)",
msg.payload[0:8192],
topic,
subscription.encoding,
subscription.job,
)
continue
subscription_topic = subscription.topic
if subscription_topic not in msg_cache_by_subscription_topic:
# Only make one copy of the message
# per topic so we avoid storing a separate
# dataclass in memory for each subscriber
# to the same topic for retained messages
receive_msg = ReceiveMessage(
topic,
payload,
msg.qos,
msg.retain,
subscription_topic,
msg.timestamp,
)
msg_cache_by_subscription_topic[subscription_topic] = receive_msg
else:
receive_msg = msg_cache_by_subscription_topic[subscription_topic]
job = subscription.job
if job.job_type is HassJobType.Callback:
# We do not wrap Callback jobs in catch_log_exception since
# its expensive and we have to do it 2x for every entity
try:
job.target(receive_msg)
except Exception: # noqa: BLE001
log_exception(
partial(self._exception_message, job.target, receive_msg)
)
else:
self.hass.async_run_hass_job(job, receive_msg)
self._mqtt_data.state_write_requests.process_write_state_requests(msg)
@callback
def _async_mqtt_on_callback(
self,
_mqttc: mqtt.Client,
_userdata: None,
mid: int,
_granted_qos_reason: tuple[int, ...] | mqtt.ReasonCodes | None = None,
_properties_reason: mqtt.ReasonCodes | None = None,
) -> None:
"""Publish / Subscribe / Unsubscribe callback."""
# The callback signature for on_unsubscribe is different from on_subscribe
# see https://github.com/eclipse/paho.mqtt.python/issues/687
# properties and reason codes are not used in Home Assistant
future = self._async_get_mid_future(mid)
if future.done() and (future.cancelled() or future.exception()):
# Timed out or cancelled
return
future.set_result(None)
@callback
def _async_get_mid_future(self, mid: int) -> asyncio.Future[None]:
"""Get the future for a mid."""
if future := self._pending_operations.get(mid):
return future
future = self.hass.loop.create_future()
self._pending_operations[mid] = future
return future
@callback
def _async_mqtt_on_disconnect(
self,
_mqttc: mqtt.Client,
_userdata: None,
result_code: int,
properties: mqtt.Properties | None = None,
) -> None:
"""Disconnected callback."""
self._async_on_disconnect(result_code)
@callback
def _async_on_disconnect(self, result_code: int) -> None:
if not self.connected:
# This function is re-entrant and may be called multiple times
# when there is a broken pipe error.
return
# If disconnect is called before the connect
# result is set make sure the first connection result is set
self._async_connection_result(False)
self.connected = False
async_dispatcher_send(self.hass, MQTT_CONNECTION_STATE, False)
_LOGGER.log(
logging.INFO if result_code == 0 else logging.DEBUG,
"Disconnected from MQTT server %s:%s (%s)",
self.conf[CONF_BROKER],
self.conf.get(CONF_PORT, DEFAULT_PORT),
result_code,
)
@callback
def _async_timeout_mid(self, future: asyncio.Future[None]) -> None:
"""Timeout waiting for a mid."""
if not future.done():
future.set_exception(asyncio.TimeoutError)
async def _async_wait_for_mid_or_raise(self, mid: int, result_code: int) -> None:
"""Wait for ACK from broker or raise on error."""
if result_code != 0:
# pylint: disable-next=import-outside-toplevel
import paho.mqtt.client as mqtt
raise HomeAssistantError(
f"Error talking to MQTT: {mqtt.error_string(result_code)}"
)
# Create the mid event if not created, either _mqtt_handle_mid or
# _async_wait_for_mid_or_raise may be executed first.
future = self._async_get_mid_future(mid)
loop = self.hass.loop
timer_handle = loop.call_later(TIMEOUT_ACK, self._async_timeout_mid, future)
try:
await future
except TimeoutError:
_LOGGER.warning(
"No ACK from MQTT server in %s seconds (mid: %s)", TIMEOUT_ACK, mid
)
finally:
timer_handle.cancel()
del self._pending_operations[mid]
async def _discovery_cooldown(self) -> None:
"""Wait until all discovery and subscriptions are processed."""
now = time.monotonic()
# Reset discovery and subscribe cooldowns
self._mqtt_data.last_discovery = now
self._last_subscribe = now
last_discovery = self._mqtt_data.last_discovery
last_subscribe = now if self._pending_subscriptions else self._last_subscribe
wait_until = max(last_discovery, last_subscribe) + DISCOVERY_COOLDOWN
while now < wait_until:
await asyncio.sleep(wait_until - now)
now = time.monotonic()
last_discovery = self._mqtt_data.last_discovery
last_subscribe = (
now if self._pending_subscriptions else self._last_subscribe
)
wait_until = max(last_discovery, last_subscribe) + DISCOVERY_COOLDOWN
def _matcher_for_topic(subscription: str) -> Callable[[str], bool]:
# pylint: disable-next=import-outside-toplevel
from paho.mqtt.matcher import MQTTMatcher
matcher = MQTTMatcher()
matcher[subscription] = True
return lambda topic: next(matcher.iter_match(topic), False)
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