"""Support for MQTT message handling."""
from __future__ import annotations
import asyncio
from functools import lru_cache, partial, wraps
import inspect
from itertools import groupby
import logging
from operator import attrgetter
import ssl
import time
from typing import Any, Awaitable, Callable, Union, cast
import uuid
import attr
import certifi
import voluptuous as vol
from homeassistant import config_entries
from homeassistant.components import websocket_api
from homeassistant.const import (
CONF_CLIENT_ID,
CONF_DISCOVERY,
CONF_PASSWORD,
CONF_PAYLOAD,
CONF_PORT,
CONF_PROTOCOL,
CONF_USERNAME,
CONF_VALUE_TEMPLATE,
EVENT_HOMEASSISTANT_STARTED,
EVENT_HOMEASSISTANT_STOP,
)
from homeassistant.core import (
CoreState,
Event,
HassJob,
HomeAssistant,
ServiceCall,
callback,
)
from homeassistant.exceptions import HomeAssistantError, TemplateError, Unauthorized
from homeassistant.helpers import config_validation as cv, event, template
from homeassistant.helpers.dispatcher import async_dispatcher_connect, dispatcher_send
from homeassistant.helpers.typing import ConfigType, ServiceDataType
from homeassistant.loader import bind_hass
from homeassistant.util import dt as dt_util
from homeassistant.util.async_ import run_callback_threadsafe
from homeassistant.util.logging import catch_log_exception
# Loading the config flow file will register the flow
from . import debug_info, discovery
from .const import (
ATTR_PAYLOAD,
ATTR_QOS,
ATTR_RETAIN,
ATTR_TOPIC,
CONF_BIRTH_MESSAGE,
CONF_BROKER,
CONF_COMMAND_TOPIC,
CONF_ENCODING,
CONF_QOS,
CONF_RETAIN,
CONF_STATE_TOPIC,
CONF_TOPIC,
CONF_WILL_MESSAGE,
DATA_MQTT_CONFIG,
DEFAULT_BIRTH,
DEFAULT_DISCOVERY,
DEFAULT_ENCODING,
DEFAULT_PREFIX,
DEFAULT_QOS,
DEFAULT_RETAIN,
DEFAULT_WILL,
DOMAIN,
MQTT_CONNECTED,
MQTT_DISCONNECTED,
PROTOCOL_311,
)
from .discovery import LAST_DISCOVERY
from .models import (
AsyncMessageCallbackType,
MessageCallbackType,
PublishMessage,
PublishPayloadType,
ReceiveMessage,
ReceivePayloadType,
)
from .util import _VALID_QOS_SCHEMA, valid_publish_topic, valid_subscribe_topic
_LOGGER = logging.getLogger(__name__)
DATA_MQTT = "mqtt"
SERVICE_PUBLISH = "publish"
SERVICE_DUMP = "dump"
CONF_DISCOVERY_PREFIX = "discovery_prefix"
CONF_KEEPALIVE = "keepalive"
CONF_CERTIFICATE = "certificate"
CONF_CLIENT_KEY = "client_key"
CONF_CLIENT_CERT = "client_cert"
CONF_TLS_INSECURE = "tls_insecure"
CONF_TLS_VERSION = "tls_version"
PROTOCOL_31 = "3.1"
DEFAULT_PORT = 1883
DEFAULT_KEEPALIVE = 60
DEFAULT_PROTOCOL = PROTOCOL_311
DEFAULT_TLS_PROTOCOL = "auto"
ATTR_TOPIC_TEMPLATE = "topic_template"
ATTR_PAYLOAD_TEMPLATE = "payload_template"
MAX_RECONNECT_WAIT = 300 # seconds
CONNECTION_SUCCESS = "connection_success"
CONNECTION_FAILED = "connection_failed"
CONNECTION_FAILED_RECOVERABLE = "connection_failed_recoverable"
DISCOVERY_COOLDOWN = 2
TIMEOUT_ACK = 10
PLATFORMS = [
"alarm_control_panel",
"binary_sensor",
"camera",
"climate",
"cover",
"fan",
"humidifier",
"light",
"lock",
"number",
"scene",
"sensor",
"switch",
"vacuum",
]
CLIENT_KEY_AUTH_MSG = (
"client_key and client_cert must both be present in "
"the MQTT broker configuration"
)
MQTT_WILL_BIRTH_SCHEMA = vol.Schema(
{
vol.Inclusive(ATTR_TOPIC, "topic_payload"): valid_publish_topic,
vol.Inclusive(ATTR_PAYLOAD, "topic_payload"): cv.string,
vol.Optional(ATTR_QOS, default=DEFAULT_QOS): _VALID_QOS_SCHEMA,
vol.Optional(ATTR_RETAIN, default=DEFAULT_RETAIN): cv.boolean,
},
required=True,
)
CONFIG_SCHEMA = vol.Schema(
{
DOMAIN: vol.All(
cv.deprecated(CONF_TLS_VERSION),
vol.Schema(
{
vol.Optional(CONF_CLIENT_ID): cv.string,
vol.Optional(CONF_KEEPALIVE, default=DEFAULT_KEEPALIVE): vol.All(
vol.Coerce(int), vol.Range(min=15)
),
vol.Optional(CONF_BROKER): cv.string,
vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
vol.Optional(CONF_USERNAME): cv.string,
vol.Optional(CONF_PASSWORD): cv.string,
vol.Optional(CONF_CERTIFICATE): vol.Any("auto", cv.isfile),
vol.Inclusive(
CONF_CLIENT_KEY, "client_key_auth", msg=CLIENT_KEY_AUTH_MSG
): cv.isfile,
vol.Inclusive(
CONF_CLIENT_CERT, "client_key_auth", msg=CLIENT_KEY_AUTH_MSG
): cv.isfile,
vol.Optional(CONF_TLS_INSECURE): cv.boolean,
vol.Optional(
CONF_TLS_VERSION, default=DEFAULT_TLS_PROTOCOL
): vol.Any("auto", "1.0", "1.1", "1.2"),
vol.Optional(CONF_PROTOCOL, default=DEFAULT_PROTOCOL): vol.All(
cv.string, vol.In([PROTOCOL_31, PROTOCOL_311])
),
vol.Optional(
CONF_WILL_MESSAGE, default=DEFAULT_WILL
): MQTT_WILL_BIRTH_SCHEMA,
vol.Optional(
CONF_BIRTH_MESSAGE, default=DEFAULT_BIRTH
): MQTT_WILL_BIRTH_SCHEMA,
vol.Optional(CONF_DISCOVERY, default=DEFAULT_DISCOVERY): cv.boolean,
# discovery_prefix must be a valid publish topic because if no
# state topic is specified, it will be created with the given prefix.
vol.Optional(
CONF_DISCOVERY_PREFIX, default=DEFAULT_PREFIX
): valid_publish_topic,
}
),
)
},
extra=vol.ALLOW_EXTRA,
)
SCHEMA_BASE = {
vol.Optional(CONF_QOS, default=DEFAULT_QOS): _VALID_QOS_SCHEMA,
vol.Optional(CONF_ENCODING, default=DEFAULT_ENCODING): cv.string,
}
MQTT_BASE_PLATFORM_SCHEMA = cv.PLATFORM_SCHEMA.extend(SCHEMA_BASE)
# Sensor type platforms subscribe to MQTT events
MQTT_RO_PLATFORM_SCHEMA = MQTT_BASE_PLATFORM_SCHEMA.extend(
{
vol.Required(CONF_STATE_TOPIC): valid_subscribe_topic,
vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
}
)
# Switch type platforms publish to MQTT and may subscribe
MQTT_RW_PLATFORM_SCHEMA = MQTT_BASE_PLATFORM_SCHEMA.extend(
{
vol.Required(CONF_COMMAND_TOPIC): valid_publish_topic,
vol.Optional(CONF_RETAIN, default=DEFAULT_RETAIN): cv.boolean,
vol.Optional(CONF_STATE_TOPIC): valid_subscribe_topic,
}
)
# Service call validation schema
MQTT_PUBLISH_SCHEMA = vol.All(
vol.Schema(
{
vol.Exclusive(ATTR_TOPIC, CONF_TOPIC): valid_publish_topic,
vol.Exclusive(ATTR_TOPIC_TEMPLATE, CONF_TOPIC): cv.string,
vol.Exclusive(ATTR_PAYLOAD, CONF_PAYLOAD): cv.string,
vol.Exclusive(ATTR_PAYLOAD_TEMPLATE, CONF_PAYLOAD): cv.string,
vol.Optional(ATTR_QOS, default=DEFAULT_QOS): _VALID_QOS_SCHEMA,
vol.Optional(ATTR_RETAIN, default=DEFAULT_RETAIN): cv.boolean,
},
required=True,
),
cv.has_at_least_one_key(ATTR_TOPIC, ATTR_TOPIC_TEMPLATE),
)
SubscribePayloadType = Union[str, bytes] # Only bytes if encoding is None
def _build_publish_data(topic: Any, qos: int, retain: bool) -> ServiceDataType:
"""Build the arguments for the publish service without the payload."""
data = {ATTR_TOPIC: topic}
if qos is not None:
data[ATTR_QOS] = qos
if retain is not None:
data[ATTR_RETAIN] = retain
return data
def publish(hass: HomeAssistant, topic, payload, qos=0, retain=False) -> None:
"""Publish message to an MQTT topic."""
hass.add_job(async_publish, hass, topic, payload, qos, retain)
async def async_publish(
hass: HomeAssistant, topic: Any, payload, qos=0, retain=False
) -> None:
"""Publish message to an MQTT topic."""
await hass.data[DATA_MQTT].async_publish(topic, str(payload), qos, retain)
AsyncDeprecatedMessageCallbackType = Callable[
[str, ReceivePayloadType, int], Awaitable[None]
]
DeprecatedMessageCallbackType = Callable[[str, ReceivePayloadType, int], None]
def wrap_msg_callback(
msg_callback: AsyncDeprecatedMessageCallbackType | DeprecatedMessageCallbackType,
) -> AsyncMessageCallbackType | MessageCallbackType:
"""Wrap an MQTT message callback to support deprecated signature."""
# Check for partials to properly determine if coroutine function
check_func = msg_callback
while isinstance(check_func, partial):
check_func = check_func.func
wrapper_func: AsyncMessageCallbackType | MessageCallbackType
if asyncio.iscoroutinefunction(check_func):
@wraps(msg_callback)
async def async_wrapper(msg: ReceiveMessage) -> None:
"""Call with deprecated signature."""
await cast(AsyncDeprecatedMessageCallbackType, msg_callback)(
msg.topic, msg.payload, msg.qos
)
wrapper_func = async_wrapper
else:
@wraps(msg_callback)
def wrapper(msg: ReceiveMessage) -> None:
"""Call with deprecated signature."""
msg_callback(msg.topic, msg.payload, msg.qos)
wrapper_func = wrapper
return wrapper_func
@bind_hass
async def async_subscribe(
hass: HomeAssistant,
topic: str,
msg_callback: AsyncMessageCallbackType
| MessageCallbackType
| DeprecatedMessageCallbackType
| AsyncDeprecatedMessageCallbackType,
qos: int = DEFAULT_QOS,
encoding: str | None = "utf-8",
):
"""Subscribe to an MQTT topic.
Call the return value to unsubscribe.
"""
# Count callback parameters which don't have a default value
non_default = 0
if msg_callback:
non_default = sum(
p.default == inspect.Parameter.empty
for _, p in inspect.signature(msg_callback).parameters.items()
)
wrapped_msg_callback = msg_callback
# If we have 3 parameters with no default value, wrap the callback
if non_default == 3:
module = inspect.getmodule(msg_callback)
_LOGGER.warning(
"Signature of MQTT msg_callback '%s.%s' is deprecated",
module.__name__ if module else "<unknown>",
msg_callback.__name__,
)
wrapped_msg_callback = wrap_msg_callback(
cast(DeprecatedMessageCallbackType, msg_callback)
)
async_remove = await hass.data[DATA_MQTT].async_subscribe(
topic,
catch_log_exception(
wrapped_msg_callback,
lambda msg: (
f"Exception in {msg_callback.__name__} when handling msg on "
f"'{msg.topic}': '{msg.payload}'"
),
),
qos,
encoding,
)
return async_remove
@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():
"""Remove listener convert."""
run_callback_threadsafe(hass.loop, async_remove).result()
return remove
async def _async_setup_discovery(
hass: HomeAssistant, conf: ConfigType, config_entry
) -> None:
"""Try to start the discovery of MQTT devices.
This method is a coroutine.
"""
await discovery.async_start(hass, conf[CONF_DISCOVERY_PREFIX], config_entry)
async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
"""Start the MQTT protocol service."""
conf: ConfigType | None = config.get(DOMAIN)
websocket_api.async_register_command(hass, websocket_subscribe)
websocket_api.async_register_command(hass, websocket_remove_device)
websocket_api.async_register_command(hass, websocket_mqtt_info)
if conf is None:
# If we have a config entry, setup is done by that config entry.
# If there is no config entry, this should fail.
return bool(hass.config_entries.async_entries(DOMAIN))
conf = dict(conf)
hass.data[DATA_MQTT_CONFIG] = conf
# Only import if we haven't before.
if not hass.config_entries.async_entries(DOMAIN):
hass.async_create_task(
hass.config_entries.flow.async_init(
DOMAIN, context={"source": config_entries.SOURCE_IMPORT}, data={}
)
)
return True
def _merge_config(entry, conf):
"""Merge configuration.yaml config with config entry."""
return {**conf, **entry.data}
async def async_setup_entry(hass, entry):
"""Load a config entry."""
conf = hass.data.get(DATA_MQTT_CONFIG)
# Config entry was created because user had configuration.yaml entry
# They removed that, so remove entry.
if conf is None and entry.source == config_entries.SOURCE_IMPORT:
hass.async_create_task(hass.config_entries.async_remove(entry.entry_id))
return False
# If user didn't have configuration.yaml config, generate defaults
if conf is None:
conf = CONFIG_SCHEMA({DOMAIN: dict(entry.data)})[DOMAIN]
elif any(key in conf for key in entry.data):
shared_keys = conf.keys() & entry.data.keys()
override = {k: entry.data[k] for k in shared_keys}
if CONF_PASSWORD in override:
override[CONF_PASSWORD] = "********"
_LOGGER.info(
"Data in your configuration entry is going to override your "
"configuration.yaml: %s",
override,
)
conf = _merge_config(entry, conf)
hass.data[DATA_MQTT] = MQTT(
hass,
entry,
conf,
)
await hass.data[DATA_MQTT].async_connect()
async def async_stop_mqtt(_event: Event):
"""Stop MQTT component."""
await hass.data[DATA_MQTT].async_disconnect()
hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, async_stop_mqtt)
async def async_publish_service(call: ServiceCall):
"""Handle MQTT publish service calls."""
msg_topic = call.data.get(ATTR_TOPIC)
msg_topic_template = call.data.get(ATTR_TOPIC_TEMPLATE)
payload = call.data.get(ATTR_PAYLOAD)
payload_template = call.data.get(ATTR_PAYLOAD_TEMPLATE)
qos: int = call.data[ATTR_QOS]
retain: bool = call.data[ATTR_RETAIN]
if msg_topic_template is not None:
try:
rendered_topic = template.Template(
msg_topic_template, hass
).async_render(parse_result=False)
msg_topic = valid_publish_topic(rendered_topic)
except (template.jinja2.TemplateError, TemplateError) as exc:
_LOGGER.error(
"Unable to publish: rendering topic template of %s "
"failed because %s",
msg_topic_template,
exc,
)
return
except vol.Invalid as err:
_LOGGER.error(
"Unable to publish: topic template '%s' produced an "
"invalid topic '%s' after rendering (%s)",
msg_topic_template,
rendered_topic,
err,
)
return
if payload_template is not None:
try:
payload = template.Template(payload_template, hass).async_render(
parse_result=False
)
except (template.jinja2.TemplateError, TemplateError) as exc:
_LOGGER.error(
"Unable to publish to %s: rendering payload template of "
"%s failed because %s",
msg_topic,
payload_template,
exc,
)
return
await hass.data[DATA_MQTT].async_publish(msg_topic, payload, qos, retain)
hass.services.async_register(
DOMAIN, SERVICE_PUBLISH, async_publish_service, schema=MQTT_PUBLISH_SCHEMA
)
async def async_dump_service(call: ServiceCall):
"""Handle MQTT dump service calls."""
messages = []
@callback
def collect_msg(msg):
messages.append((msg.topic, msg.payload.replace("\n", "")))
unsub = await async_subscribe(hass, call.data["topic"], collect_msg)
def write_dump():
with open(hass.config.path("mqtt_dump.txt"), "wt", encoding="utf8") as fp:
for msg in messages:
fp.write(",".join(msg) + "\n")
async def finish_dump(_):
"""Write dump to file."""
unsub()
await hass.async_add_executor_job(write_dump)
event.async_call_later(hass, call.data["duration"], finish_dump)
hass.services.async_register(
DOMAIN,
SERVICE_DUMP,
async_dump_service,
schema=vol.Schema(
{
vol.Required("topic"): valid_subscribe_topic,
vol.Optional("duration", default=5): int,
}
),
)
if conf.get(CONF_DISCOVERY):
await _async_setup_discovery(hass, conf, entry)
return True
@attr.s(slots=True, frozen=True)
class Subscription:
"""Class to hold data about an active subscription."""
topic: str = attr.ib()
matcher: Any = attr.ib()
job: HassJob = attr.ib()
qos: int = attr.ib(default=0)
encoding: str | None = attr.ib(default="utf-8")
class MQTT:
"""Home Assistant MQTT client."""
def __init__(
self,
hass: HomeAssistant,
config_entry,
conf,
) -> None:
"""Initialize Home Assistant MQTT client."""
# 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
self.hass = hass
self.config_entry = config_entry
self.conf = conf
self.subscriptions: list[Subscription] = []
self.connected = False
self._ha_started = asyncio.Event()
self._last_subscribe = time.time()
self._mqttc: mqtt.Client = None
self._paho_lock = asyncio.Lock()
self._pending_operations: dict[str, asyncio.Event] = {}
if self.hass.state == CoreState.running:
self._ha_started.set()
else:
@callback
def ha_started(_):
self._ha_started.set()
self.hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STARTED, ha_started)
self.init_client()
self.config_entry.add_update_listener(self.async_config_entry_updated)
@staticmethod
async def async_config_entry_updated(hass, entry) -> None:
"""Handle signals of config entry being updated.
This is a static method because a class method (bound method), can not be used with weak references.
Causes for this is config entry options changing.
"""
self = hass.data[DATA_MQTT]
if (conf := hass.data.get(DATA_MQTT_CONFIG)) is None:
conf = CONFIG_SCHEMA({DOMAIN: dict(entry.data)})[DOMAIN]
self.conf = _merge_config(entry, conf)
await self.async_disconnect()
self.init_client()
await self.async_connect()
await discovery.async_stop(hass)
if self.conf.get(CONF_DISCOVERY):
await _async_setup_discovery(hass, self.conf, entry)
def init_client(self):
"""Initialize paho client."""
# 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
if self.conf[CONF_PROTOCOL] == PROTOCOL_31:
proto: int = mqtt.MQTTv31
else:
proto = mqtt.MQTTv311
if (client_id := self.conf.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)
self._mqttc = mqtt.Client(client_id, protocol=proto)
# Enable logging
self._mqttc.enable_logger()
username = self.conf.get(CONF_USERNAME)
password = self.conf.get(CONF_PASSWORD)
if username is not None:
self._mqttc.username_pw_set(username, password)
if (certificate := self.conf.get(CONF_CERTIFICATE)) == "auto":
certificate = certifi.where()
client_key = self.conf.get(CONF_CLIENT_KEY)
client_cert = self.conf.get(CONF_CLIENT_CERT)
tls_insecure = self.conf.get(CONF_TLS_INSECURE)
if certificate is not None:
self._mqttc.tls_set(
certificate,
certfile=client_cert,
keyfile=client_key,
tls_version=ssl.PROTOCOL_TLS,
)
if tls_insecure is not None:
self._mqttc.tls_insecure_set(tls_insecure)
self._mqttc.on_connect = self._mqtt_on_connect
self._mqttc.on_disconnect = self._mqtt_on_disconnect
self._mqttc.on_message = self._mqtt_on_message
self._mqttc.on_publish = self._mqtt_on_callback
self._mqttc.on_subscribe = self._mqtt_on_callback
self._mqttc.on_unsubscribe = self._mqtt_on_callback
if (
CONF_WILL_MESSAGE in self.conf
and ATTR_TOPIC in self.conf[CONF_WILL_MESSAGE]
):
will_message = PublishMessage(**self.conf[CONF_WILL_MESSAGE])
else:
will_message = None
if will_message is not None:
self._mqttc.will_set(
topic=will_message.topic,
payload=will_message.payload,
qos=will_message.qos,
retain=will_message.retain,
)
async def async_publish(
self, topic: str, payload: PublishPayloadType, qos: int, retain: bool
) -> None:
"""Publish a MQTT message."""
async with self._paho_lock:
msg_info = await self.hass.async_add_executor_job(
self._mqttc.publish, topic, payload, qos, retain
)
_LOGGER.debug(
"Transmitting message on %s: '%s', mid: %s",
topic,
payload,
msg_info.mid,
)
_raise_on_error(msg_info.rc)
await self._wait_for_mid(msg_info.mid)
async def async_connect(self) -> None:
"""Connect to the host. Does not process messages yet."""
# pylint: disable=import-outside-toplevel
import paho.mqtt.client as mqtt
result: int | None = None
try:
result = await self.hass.async_add_executor_job(
self._mqttc.connect,
self.conf[CONF_BROKER],
self.conf[CONF_PORT],
self.conf[CONF_KEEPALIVE],
)
except OSError as err:
_LOGGER.error("Failed to connect to MQTT server due to exception: %s", err)
if result is not None and result != 0:
_LOGGER.error(
"Failed to connect to MQTT server: %s", mqtt.error_string(result)
)
self._mqttc.loop_start()
async def async_disconnect(self):
"""Stop the MQTT client."""
def stop():
"""Stop the MQTT client."""
# Do not disconnect, we want the broker to always publish will
self._mqttc.loop_stop()
await self.hass.async_add_executor_job(stop)
async def async_subscribe(
self,
topic: str,
msg_callback: MessageCallbackType,
qos: int,
encoding: str | None = None,
) -> Callable[[], None]:
"""Set up a subscription to a topic with the provided qos.
This method is a coroutine.
"""
if not isinstance(topic, str):
raise HomeAssistantError("Topic needs to be a string!")
subscription = Subscription(
topic, _matcher_for_topic(topic), HassJob(msg_callback), qos, encoding
)
self.subscriptions.append(subscription)
self._matching_subscriptions.cache_clear()
# Only subscribe if currently connected.
if self.connected:
self._last_subscribe = time.time()
await self._async_perform_subscription(topic, qos)
@callback
def async_remove() -> None:
"""Remove subscription."""
if subscription not in self.subscriptions:
raise HomeAssistantError("Can't remove subscription twice")
self.subscriptions.remove(subscription)
self._matching_subscriptions.cache_clear()
if any(other.topic == topic for other in self.subscriptions):
# Other subscriptions on topic remaining - don't unsubscribe.
return
# Only unsubscribe if currently connected.
if self.connected:
self.hass.async_create_task(self._async_unsubscribe(topic))
return async_remove
async def _async_unsubscribe(self, topic: str) -> None:
"""Unsubscribe from a topic.
This method is a coroutine.
"""
async with self._paho_lock:
result: int | None = None
result, mid = await self.hass.async_add_executor_job(
self._mqttc.unsubscribe, topic
)
_LOGGER.debug("Unsubscribing from %s, mid: %s", topic, mid)
_raise_on_error(result)
await self._wait_for_mid(mid)
async def _async_perform_subscription(self, topic: str, qos: int) -> None:
"""Perform a paho-mqtt subscription."""
async with self._paho_lock:
result: int | None = None
result, mid = await self.hass.async_add_executor_job(
self._mqttc.subscribe, topic, qos
)
_LOGGER.debug("Subscribing to %s, mid: %s", topic, mid)
_raise_on_error(result)
await self._wait_for_mid(mid)
def _mqtt_on_connect(self, _mqttc, _userdata, _flags, result_code: int) -> None:
"""On connect callback.
Resubscribe to all topics we were subscribed to and publish birth
message.
"""
# pylint: disable=import-outside-toplevel
import paho.mqtt.client as mqtt
if result_code != mqtt.CONNACK_ACCEPTED:
_LOGGER.error(
"Unable to connect to the MQTT broker: %s",
mqtt.connack_string(result_code),
)
return
self.connected = True
dispatcher_send(self.hass, MQTT_CONNECTED)
_LOGGER.info(
"Connected to MQTT server %s:%s (%s)",
self.conf[CONF_BROKER],
self.conf[CONF_PORT],
result_code,
)
# Group subscriptions to only re-subscribe once for each topic.
keyfunc = attrgetter("topic")
for topic, subs in groupby(sorted(self.subscriptions, key=keyfunc), keyfunc):
# Re-subscribe with the highest requested qos
max_qos = max(subscription.qos for subscription in subs)
self.hass.add_job(self._async_perform_subscription, topic, max_qos)
if (
CONF_BIRTH_MESSAGE in self.conf
and ATTR_TOPIC in self.conf[CONF_BIRTH_MESSAGE]
):
async def publish_birth_message(birth_message):
await self._ha_started.wait() # Wait for Home Assistant to start
await self._discovery_cooldown() # Wait for MQTT discovery to cool down
await self.async_publish(
topic=birth_message.topic,
payload=birth_message.payload,
qos=birth_message.qos,
retain=birth_message.retain,
)
birth_message = PublishMessage(**self.conf[CONF_BIRTH_MESSAGE])
asyncio.run_coroutine_threadsafe(
publish_birth_message(birth_message), self.hass.loop
)
def _mqtt_on_message(self, _mqttc, _userdata, msg) -> None:
"""Message received callback."""
self.hass.add_job(self._mqtt_handle_message, msg)
@lru_cache(2048)
def _matching_subscriptions(self, topic):
subscriptions = []
for subscription in self.subscriptions:
if subscription.matcher(topic):
subscriptions.append(subscription)
return subscriptions
@callback
def _mqtt_handle_message(self, msg) -> None:
_LOGGER.debug(
"Received message on %s%s: %s",
msg.topic,
" (retained)" if msg.retain else "",
msg.payload[0:8192],
)
timestamp = dt_util.utcnow()
subscriptions = self._matching_subscriptions(msg.topic)
for subscription in subscriptions:
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],
msg.topic,
subscription.encoding,
subscription.job,
)
continue
self.hass.async_run_hass_job(
subscription.job,
ReceiveMessage(
msg.topic,
payload,
msg.qos,
msg.retain,
subscription.topic,
timestamp,
),
)
def _mqtt_on_callback(self, _mqttc, _userdata, mid, _granted_qos=None) -> None:
"""Publish / Subscribe / Unsubscribe callback."""
self.hass.add_job(self._mqtt_handle_mid, mid)
@callback
def _mqtt_handle_mid(self, mid) -> None:
# Create the mid event if not created, either _mqtt_handle_mid or _wait_for_mid
# may be executed first.
if mid not in self._pending_operations:
self._pending_operations[mid] = asyncio.Event()
self._pending_operations[mid].set()
def _mqtt_on_disconnect(self, _mqttc, _userdata, result_code: int) -> None:
"""Disconnected callback."""
self.connected = False
dispatcher_send(self.hass, MQTT_DISCONNECTED)
_LOGGER.warning(
"Disconnected from MQTT server %s:%s (%s)",
self.conf[CONF_BROKER],
self.conf[CONF_PORT],
result_code,
)
async def _wait_for_mid(self, mid):
"""Wait for ACK from broker."""
# Create the mid event if not created, either _mqtt_handle_mid or _wait_for_mid
# may be executed first.
if mid not in self._pending_operations:
self._pending_operations[mid] = asyncio.Event()
try:
await asyncio.wait_for(self._pending_operations[mid].wait(), TIMEOUT_ACK)
except asyncio.TimeoutError:
_LOGGER.warning(
"No ACK from MQTT server in %s seconds (mid: %s)", TIMEOUT_ACK, mid
)
finally:
del self._pending_operations[mid]
async def _discovery_cooldown(self):
now = time.time()
# Reset discovery and subscribe cooldowns
self.hass.data[LAST_DISCOVERY] = now
self._last_subscribe = now
last_discovery = self.hass.data[LAST_DISCOVERY]
last_subscribe = self._last_subscribe
wait_until = max(
last_discovery + DISCOVERY_COOLDOWN, last_subscribe + DISCOVERY_COOLDOWN
)
while now < wait_until:
await asyncio.sleep(wait_until - now)
now = time.time()
last_discovery = self.hass.data[LAST_DISCOVERY]
last_subscribe = self._last_subscribe
wait_until = max(
last_discovery + DISCOVERY_COOLDOWN, last_subscribe + DISCOVERY_COOLDOWN
)
def _raise_on_error(result_code: int | None) -> None:
"""Raise error if error result."""
# pylint: disable=import-outside-toplevel
import paho.mqtt.client as mqtt
if result_code is not None and result_code != 0:
raise HomeAssistantError(
f"Error talking to MQTT: {mqtt.error_string(result_code)}"
)
def _matcher_for_topic(subscription: str) -> Any:
# pylint: disable=import-outside-toplevel
from paho.mqtt.matcher import MQTTMatcher
matcher = MQTTMatcher()
matcher[subscription] = True
return lambda topic: next(matcher.iter_match(topic), False)
@websocket_api.websocket_command(
{vol.Required("type"): "mqtt/device/debug_info", vol.Required("device_id"): str}
)
@websocket_api.async_response
async def websocket_mqtt_info(hass, connection, msg):
"""Get MQTT debug info for device."""
device_id = msg["device_id"]
mqtt_info = await debug_info.info_for_device(hass, device_id)
connection.send_result(msg["id"], mqtt_info)
@websocket_api.websocket_command(
{vol.Required("type"): "mqtt/device/remove", vol.Required("device_id"): str}
)
@websocket_api.async_response
async def websocket_remove_device(hass, connection, msg):
"""Delete device."""
device_id = msg["device_id"]
dev_registry = await hass.helpers.device_registry.async_get_registry()
if not (device := dev_registry.async_get(device_id)):
connection.send_error(
msg["id"], websocket_api.const.ERR_NOT_FOUND, "Device not found"
)
return
for config_entry in device.config_entries:
config_entry = hass.config_entries.async_get_entry(config_entry)
# Only delete the device if it belongs to an MQTT device entry
if config_entry.domain == DOMAIN:
dev_registry.async_remove_device(device_id)
connection.send_message(websocket_api.result_message(msg["id"]))
return
connection.send_error(
msg["id"], websocket_api.const.ERR_NOT_FOUND, "Non MQTT device"
)
@websocket_api.websocket_command(
{
vol.Required("type"): "mqtt/subscribe",
vol.Required("topic"): valid_subscribe_topic,
}
)
@websocket_api.async_response
async def websocket_subscribe(hass, connection, msg):
"""Subscribe to a MQTT topic."""
if not connection.user.is_admin:
raise Unauthorized
async def forward_messages(mqttmsg: ReceiveMessage):
"""Forward events to websocket."""
connection.send_message(
websocket_api.event_message(
msg["id"],
{
"topic": mqttmsg.topic,
"payload": mqttmsg.payload,
"qos": mqttmsg.qos,
"retain": mqttmsg.retain,
},
)
)
connection.subscriptions[msg["id"]] = await async_subscribe(
hass, msg["topic"], forward_messages
)
connection.send_message(websocket_api.result_message(msg["id"]))
ConnectionStatusCallback = Callable[[bool], None]
@callback
def async_subscribe_connection_status(
hass: HomeAssistant, connection_status_callback: ConnectionStatusCallback
) -> Callable[[], None]:
"""Subscribe to MQTT connection changes."""
connection_status_callback_job = HassJob(connection_status_callback)
async def connected():
task = hass.async_run_hass_job(connection_status_callback_job, True)
if task:
await task
async def disconnected():
task = hass.async_run_hass_job(connection_status_callback_job, False)
if task:
await task
subscriptions = {
"connect": async_dispatcher_connect(hass, MQTT_CONNECTED, connected),
"disconnect": async_dispatcher_connect(hass, MQTT_DISCONNECTED, disconnected),
}
@callback
def unsubscribe():
subscriptions["connect"]()
subscriptions["disconnect"]()
return unsubscribe
def is_connected(hass: HomeAssistant) -> bool:
"""Return if MQTT client is connected."""
return hass.data[DATA_MQTT].connected