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core/homeassistant/components/mqtt/__init__.py

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"""
Support for MQTT message handling.
For more details about this component, please refer to the documentation at
https://home-assistant.io/components/mqtt/
"""
import asyncio
from itertools import groupby
from typing import Optional, Any, Union, Callable, List, cast # noqa: F401
from operator import attrgetter
import logging
import os
import socket
import time
import ssl
import re
import requests.certs
import attr
import voluptuous as vol
from homeassistant.helpers.typing import HomeAssistantType, ConfigType, \
ServiceDataType
from homeassistant.core import callback, Event, ServiceCall
from homeassistant.setup import async_prepare_setup_platform
from homeassistant.exceptions import HomeAssistantError
from homeassistant.loader import bind_hass
from homeassistant.helpers import template, config_validation as cv
from homeassistant.helpers.entity import Entity
from homeassistant.util.async_ import (
run_coroutine_threadsafe, run_callback_threadsafe)
from homeassistant.const import (
EVENT_HOMEASSISTANT_STOP, CONF_VALUE_TEMPLATE, CONF_USERNAME,
CONF_PASSWORD, CONF_PORT, CONF_PROTOCOL, CONF_PAYLOAD)
from homeassistant.components.mqtt.server import HBMQTT_CONFIG_SCHEMA
REQUIREMENTS = ['paho-mqtt==1.3.1']
_LOGGER = logging.getLogger(__name__)
DOMAIN = 'mqtt'
DATA_MQTT = 'mqtt'
SERVICE_PUBLISH = 'publish'
CONF_EMBEDDED = 'embedded'
CONF_BROKER = 'broker'
CONF_CLIENT_ID = 'client_id'
CONF_DISCOVERY = 'discovery'
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'
CONF_BIRTH_MESSAGE = 'birth_message'
CONF_WILL_MESSAGE = 'will_message'
CONF_STATE_TOPIC = 'state_topic'
CONF_COMMAND_TOPIC = 'command_topic'
CONF_AVAILABILITY_TOPIC = 'availability_topic'
CONF_PAYLOAD_AVAILABLE = 'payload_available'
CONF_PAYLOAD_NOT_AVAILABLE = 'payload_not_available'
CONF_QOS = 'qos'
CONF_RETAIN = 'retain'
PROTOCOL_31 = '3.1'
PROTOCOL_311 = '3.1.1'
DEFAULT_PORT = 1883
DEFAULT_KEEPALIVE = 60
DEFAULT_QOS = 0
DEFAULT_RETAIN = False
DEFAULT_PROTOCOL = PROTOCOL_311
DEFAULT_DISCOVERY = False
DEFAULT_DISCOVERY_PREFIX = 'homeassistant'
DEFAULT_TLS_PROTOCOL = 'auto'
DEFAULT_PAYLOAD_AVAILABLE = 'online'
DEFAULT_PAYLOAD_NOT_AVAILABLE = 'offline'
ATTR_TOPIC = 'topic'
ATTR_PAYLOAD = 'payload'
ATTR_PAYLOAD_TEMPLATE = 'payload_template'
ATTR_QOS = CONF_QOS
ATTR_RETAIN = CONF_RETAIN
MAX_RECONNECT_WAIT = 300 # seconds
def valid_subscribe_topic(value: Any, invalid_chars='\0') -> str:
"""Validate that we can subscribe using this MQTT topic."""
value = cv.string(value)
if all(c not in value for c in invalid_chars):
return vol.Length(min=1, max=65535)(value)
raise vol.Invalid('Invalid MQTT topic name')
def valid_publish_topic(value: Any) -> str:
"""Validate that we can publish using this MQTT topic."""
return valid_subscribe_topic(value, invalid_chars='#+\0')
def valid_discovery_topic(value: Any) -> str:
"""Validate a discovery topic."""
return valid_subscribe_topic(value, invalid_chars='#+\0/')
_VALID_QOS_SCHEMA = vol.All(vol.Coerce(int), vol.In([0, 1, 2]))
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.Required(ATTR_TOPIC): valid_publish_topic,
vol.Required(ATTR_PAYLOAD, 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)
CONFIG_SCHEMA = vol.Schema({
DOMAIN: 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_EMBEDDED): HBMQTT_CONFIG_SCHEMA,
vol.Optional(CONF_WILL_MESSAGE): MQTT_WILL_BIRTH_SCHEMA,
vol.Optional(CONF_BIRTH_MESSAGE): MQTT_WILL_BIRTH_SCHEMA,
vol.Optional(CONF_DISCOVERY, default=DEFAULT_DISCOVERY): cv.boolean,
vol.Optional(CONF_DISCOVERY_PREFIX,
default=DEFAULT_DISCOVERY_PREFIX): valid_discovery_topic,
}),
}, extra=vol.ALLOW_EXTRA)
SCHEMA_BASE = {
vol.Optional(CONF_QOS, default=DEFAULT_QOS): _VALID_QOS_SCHEMA,
}
MQTT_AVAILABILITY_SCHEMA = vol.Schema({
vol.Optional(CONF_AVAILABILITY_TOPIC): valid_subscribe_topic,
vol.Optional(CONF_PAYLOAD_AVAILABLE,
default=DEFAULT_PAYLOAD_AVAILABLE): cv.string,
vol.Optional(CONF_PAYLOAD_NOT_AVAILABLE,
default=DEFAULT_PAYLOAD_NOT_AVAILABLE): 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,
vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
})
# Service call validation schema
MQTT_PUBLISH_SCHEMA = vol.Schema({
vol.Required(ATTR_TOPIC): valid_publish_topic,
vol.Exclusive(ATTR_PAYLOAD, CONF_PAYLOAD): object,
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)
# pylint: disable=invalid-name
PublishPayloadType = Union[str, bytes, int, float, None]
SubscribePayloadType = Union[str, bytes] # Only bytes if encoding is None
MessageCallbackType = Callable[[str, SubscribePayloadType, int], 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
@bind_hass
def publish(hass: HomeAssistantType, topic, payload, qos=None,
retain=None) -> None:
"""Publish message to an MQTT topic."""
hass.add_job(async_publish, hass, topic, payload, qos, retain)
@callback
@bind_hass
def async_publish(hass: HomeAssistantType, topic: Any, payload, qos=None,
retain=None) -> None:
"""Publish message to an MQTT topic."""
data = _build_publish_data(topic, qos, retain)
data[ATTR_PAYLOAD] = payload
hass.async_add_job(hass.services.async_call(DOMAIN, SERVICE_PUBLISH, data))
@bind_hass
def publish_template(hass: HomeAssistantType, topic, payload_template,
qos=None, retain=None) -> None:
"""Publish message to an MQTT topic using a template payload."""
data = _build_publish_data(topic, qos, retain)
data[ATTR_PAYLOAD_TEMPLATE] = payload_template
hass.services.call(DOMAIN, SERVICE_PUBLISH, data)
@bind_hass
async def async_subscribe(hass: HomeAssistantType, topic: str,
msg_callback: MessageCallbackType,
qos: int = DEFAULT_QOS,
encoding: str = 'utf-8'):
"""Subscribe to an MQTT topic.
Call the return value to unsubscribe.
"""
async_remove = await hass.data[DATA_MQTT].async_subscribe(
topic, msg_callback, qos, encoding)
return async_remove
@bind_hass
def subscribe(hass: HomeAssistantType, topic: str,
msg_callback: MessageCallbackType, qos: int = DEFAULT_QOS,
encoding: str = 'utf-8') -> Callable[[], None]:
"""Subscribe to an MQTT topic."""
async_remove = 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_server(hass: HomeAssistantType,
config: ConfigType):
"""Try to start embedded MQTT broker.
This method is a coroutine.
"""
conf = config.get(DOMAIN, {}) # type: ConfigType
server = await async_prepare_setup_platform(
hass, config, DOMAIN, 'server')
if server is None:
_LOGGER.error("Unable to load embedded server")
return None
success, broker_config = \
await server.async_start(hass, conf.get(CONF_EMBEDDED))
if not success:
return None
return broker_config
async def _async_setup_discovery(hass: HomeAssistantType,
config: ConfigType) -> bool:
"""Try to start the discovery of MQTT devices.
This method is a coroutine.
"""
conf = config.get(DOMAIN, {}) # type: ConfigType
discovery = await async_prepare_setup_platform(
hass, config, DOMAIN, 'discovery')
if discovery is None:
_LOGGER.error("Unable to load MQTT discovery")
return False
success = await discovery.async_start(
hass, conf[CONF_DISCOVERY_PREFIX], config) # type: bool
return success
async def async_setup(hass: HomeAssistantType, config: ConfigType) -> bool:
"""Start the MQTT protocol service."""
conf = config.get(DOMAIN) # type: Optional[ConfigType]
if conf is None:
conf = CONFIG_SCHEMA({DOMAIN: {}})[DOMAIN]
conf = cast(ConfigType, conf)
client_id = conf.get(CONF_CLIENT_ID) # type: Optional[str]
keepalive = conf.get(CONF_KEEPALIVE) # type: int
# Only setup if embedded config passed in or no broker specified
if CONF_EMBEDDED not in conf and CONF_BROKER in conf:
broker_config = None
else:
broker_config = await _async_setup_server(hass, config)
if CONF_BROKER in conf:
broker = conf[CONF_BROKER] # type: str
port = conf[CONF_PORT] # type: int
username = conf.get(CONF_USERNAME) # type: Optional[str]
password = conf.get(CONF_PASSWORD) # type: Optional[str]
certificate = conf.get(CONF_CERTIFICATE) # type: Optional[str]
client_key = conf.get(CONF_CLIENT_KEY) # type: Optional[str]
client_cert = conf.get(CONF_CLIENT_CERT) # type: Optional[str]
tls_insecure = conf.get(CONF_TLS_INSECURE) # type: Optional[bool]
protocol = conf[CONF_PROTOCOL] # type: str
elif broker_config is not None:
# If no broker passed in, auto config to internal server
broker, port, username, password, certificate, protocol = broker_config
# Embedded broker doesn't have some ssl variables
client_key, client_cert, tls_insecure = None, None, None
# hbmqtt requires a client id to be set.
if client_id is None:
client_id = 'home-assistant'
else:
err = "Unable to start MQTT broker."
if conf.get(CONF_EMBEDDED) is not None:
# Explicit embedded config, requires explicit broker config
err += " (Broker configuration required.)"
_LOGGER.error(err)
return False
# For cloudmqtt.com, secured connection, auto fill in certificate
if (certificate is None and 19999 < port < 30000 and
broker.endswith('.cloudmqtt.com')):
certificate = os.path.join(os.path.dirname(__file__),
'addtrustexternalcaroot.crt')
# When the certificate is set to auto, use bundled certs from requests
if certificate == 'auto':
certificate = requests.certs.where()
will_message = None # type: Optional[Message]
if conf.get(CONF_WILL_MESSAGE) is not None:
will_message = Message(**conf.get(CONF_WILL_MESSAGE))
birth_message = None # type: Optional[Message]
if conf.get(CONF_BIRTH_MESSAGE) is not None:
birth_message = Message(**conf.get(CONF_BIRTH_MESSAGE))
# Be able to override versions other than TLSv1.0 under Python3.6
conf_tls_version = conf.get(CONF_TLS_VERSION) # type: str
if conf_tls_version == '1.2':
tls_version = ssl.PROTOCOL_TLSv1_2
elif conf_tls_version == '1.1':
tls_version = ssl.PROTOCOL_TLSv1_1
elif conf_tls_version == '1.0':
tls_version = ssl.PROTOCOL_TLSv1
else:
import sys
# Python3.6 supports automatic negotiation of highest TLS version
if sys.hexversion >= 0x03060000:
tls_version = ssl.PROTOCOL_TLS # pylint: disable=no-member
else:
tls_version = ssl.PROTOCOL_TLSv1
try:
hass.data[DATA_MQTT] = MQTT(
hass, broker, port, client_id, keepalive, username, password,
certificate, client_key, client_cert, tls_insecure, protocol,
will_message, birth_message, tls_version)
except socket.error:
_LOGGER.exception("Can't connect to the broker. "
"Please check your settings and the broker itself")
return False
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)
success = await hass.data[DATA_MQTT].async_connect() # type: bool
if not success:
return False
async def async_publish_service(call: ServiceCall):
"""Handle MQTT publish service calls."""
msg_topic = call.data[ATTR_TOPIC] # type: str
payload = call.data.get(ATTR_PAYLOAD)
payload_template = call.data.get(ATTR_PAYLOAD_TEMPLATE)
qos = call.data[ATTR_QOS] # type: int
retain = call.data[ATTR_RETAIN] # type: bool
if payload_template is not None:
try:
payload = \
template.Template(payload_template, hass).async_render()
except template.jinja2.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)
if conf.get(CONF_DISCOVERY):
await _async_setup_discovery(hass, config)
return True
@attr.s(slots=True, frozen=True)
class Subscription(object):
"""Class to hold data about an active subscription."""
topic = attr.ib(type=str)
callback = attr.ib(type=MessageCallbackType)
qos = attr.ib(type=int, default=0)
encoding = attr.ib(type=str, default='utf-8')
@attr.s(slots=True, frozen=True)
class Message(object):
"""MQTT Message."""
topic = attr.ib(type=str)
payload = attr.ib(type=PublishPayloadType)
qos = attr.ib(type=int, default=0)
retain = attr.ib(type=bool, default=False)
class MQTT(object):
"""Home Assistant MQTT client."""
def __init__(self, hass: HomeAssistantType, broker: str, port: int,
client_id: Optional[str], keepalive: Optional[int],
username: Optional[str], password: Optional[str],
certificate: Optional[str], client_key: Optional[str],
client_cert: Optional[str], tls_insecure: Optional[bool],
protocol: Optional[str], will_message: Optional[Message],
birth_message: Optional[Message], tls_version) -> None:
"""Initialize Home Assistant MQTT client."""
import paho.mqtt.client as mqtt
self.hass = hass
self.broker = broker
self.port = port
self.keepalive = keepalive
self.subscriptions = [] # type: List[Subscription]
self.birth_message = birth_message
self._mqttc = None # type: mqtt.Client
self._paho_lock = asyncio.Lock(loop=hass.loop)
if protocol == PROTOCOL_31:
proto = mqtt.MQTTv31 # type: int
else:
proto = mqtt.MQTTv311
if client_id is None:
self._mqttc = mqtt.Client(protocol=proto)
else:
self._mqttc = mqtt.Client(client_id, protocol=proto)
if username is not None:
self._mqttc.username_pw_set(username, password)
if certificate is not None:
self._mqttc.tls_set(
certificate, certfile=client_cert,
keyfile=client_key, tls_version=tls_version)
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
if will_message is not None:
self._mqttc.will_set(*attr.astuple(will_message))
async def async_publish(self, topic: str, payload: PublishPayloadType,
qos: int, retain: bool) -> None:
"""Publish a MQTT message.
This method must be run in the event loop and returns a coroutine.
"""
async with self._paho_lock:
await self.hass.async_add_job(
self._mqttc.publish, topic, payload, qos, retain)
async def async_connect(self) -> bool:
"""Connect to the host. Does process messages yet.
This method is a coroutine.
"""
result = None # type: int
try:
result = await self.hass.async_add_job(
self._mqttc.connect, self.broker, self.port, self.keepalive)
except OSError as err:
_LOGGER.error('Failed to connect due to exception: %s', err)
return False
if result != 0:
import paho.mqtt.client as mqtt
_LOGGER.error('Failed to connect: %s', mqtt.error_string(result))
return False
self._mqttc.loop_start()
return True
@callback
def async_disconnect(self):
"""Stop the MQTT client.
This method must be run in the event loop and returns a coroutine.
"""
def stop():
"""Stop the MQTT client."""
self._mqttc.disconnect()
self._mqttc.loop_stop()
return self.hass.async_add_job(stop)
async def async_subscribe(self, topic: str,
msg_callback: MessageCallbackType,
qos: int, encoding: str) -> 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, msg_callback, qos, encoding)
self.subscriptions.append(subscription)
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)
if any(other.topic == topic for other in self.subscriptions):
# Other subscriptions on topic remaining - don't unsubscribe.
return
self.hass.async_add_job(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 = None # type: int
result, _ = await self.hass.async_add_job(
self._mqttc.unsubscribe, topic)
_raise_on_error(result)
async def _async_perform_subscription(self, topic: str, qos: int) -> None:
"""Perform a paho-mqtt subscription."""
_LOGGER.debug("Subscribing to %s", topic)
async with self._paho_lock:
result = None # type: int
result, _ = await self.hass.async_add_job(
self._mqttc.subscribe, topic, qos)
_raise_on_error(result)
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.
"""
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))
self._mqttc.disconnect()
return
# 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 self.birth_message:
self.hass.add_job(
self.async_publish(*attr.astuple(self.birth_message)))
def _mqtt_on_message(self, _mqttc, _userdata, msg) -> None:
"""Message received callback."""
self.hass.add_job(self._mqtt_handle_message, msg)
@callback
def _mqtt_handle_message(self, msg) -> None:
_LOGGER.debug("Received message on %s: %s", msg.topic, msg.payload)
for subscription in self.subscriptions:
if not _match_topic(subscription.topic, msg.topic):
continue
payload = msg.payload # type: SubscribePayloadType
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",
msg.payload, msg.topic,
subscription.encoding)
continue
self.hass.async_run_job(subscription.callback,
msg.topic, payload, msg.qos)
def _mqtt_on_disconnect(self, _mqttc, _userdata, result_code: int) -> None:
"""Disconnected callback."""
# When disconnected because of calling disconnect()
if result_code == 0:
return
tries = 0
while True:
try:
if self._mqttc.reconnect() == 0:
_LOGGER.info("Successfully reconnected to the MQTT server")
break
except socket.error:
pass
wait_time = min(2**tries, MAX_RECONNECT_WAIT)
_LOGGER.warning(
"Disconnected from MQTT (%s). Trying to reconnect in %s s",
result_code, wait_time)
# It is ok to sleep here as we are in the MQTT thread.
time.sleep(wait_time)
tries += 1
def _raise_on_error(result_code: int) -> None:
"""Raise error if error result."""
if result_code != 0:
import paho.mqtt.client as mqtt
raise HomeAssistantError(
'Error talking to MQTT: {}'.format(mqtt.error_string(result_code)))
def _match_topic(subscription: str, topic: str) -> bool:
"""Test if topic matches subscription."""
reg_ex_parts = [] # type: List[str]
suffix = ""
if subscription.endswith('#'):
subscription = subscription[:-2]
suffix = "(.*)"
sub_parts = subscription.split('/')
for sub_part in sub_parts:
if sub_part == "+":
reg_ex_parts.append(r"([^\/]+)")
else:
reg_ex_parts.append(re.escape(sub_part))
reg_ex = "^" + (r'\/'.join(reg_ex_parts)) + suffix + "$"
reg = re.compile(reg_ex)
return reg.match(topic) is not None
class MqttAvailability(Entity):
"""Mixin used for platforms that report availability."""
def __init__(self, availability_topic: Optional[str], qos: Optional[int],
payload_available: Optional[str],
payload_not_available: Optional[str]) -> None:
"""Initialize the availability mixin."""
self._availability_topic = availability_topic
self._availability_qos = qos
self._available = availability_topic is None # type: bool
self._payload_available = payload_available
self._payload_not_available = payload_not_available
async def async_added_to_hass(self) -> None:
"""Subscribe mqtt events.
This method must be run in the event loop and returns a coroutine.
"""
@callback
def availability_message_received(topic: str,
payload: SubscribePayloadType,
qos: int) -> None:
"""Handle a new received MQTT availability message."""
if payload == self._payload_available:
self._available = True
elif payload == self._payload_not_available:
self._available = False
self.async_schedule_update_ha_state()
if self._availability_topic is not None:
await async_subscribe(
self.hass, self._availability_topic,
availability_message_received, self._availability_qos)
@property
def available(self) -> bool:
"""Return if the device is available."""
return self._available
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