File size: 3,096 Bytes
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Support for MQTT discovery.
For more details about this component, please refer to the documentation at
https://home-assistant.io/components/mqtt/#discovery
"""
import asyncio
import json
import logging
import re
import homeassistant.components.mqtt as mqtt
from homeassistant.helpers.discovery import async_load_platform
from homeassistant.const import CONF_PLATFORM
from homeassistant.components.mqtt import CONF_STATE_TOPIC
_LOGGER = logging.getLogger(__name__)
TOPIC_MATCHER = re.compile(
r'(?P<prefix_topic>\w+)/(?P<component>\w+)/'
r'(?:(?P<node_id>[a-zA-Z0-9_-]+)/)?(?P<object_id>[a-zA-Z0-9_-]+)/config')
SUPPORTED_COMPONENTS = ['binary_sensor', 'light', 'sensor', 'switch']
ALLOWED_PLATFORMS = {
'binary_sensor': ['mqtt'],
'light': ['mqtt', 'mqtt_json', 'mqtt_template'],
'sensor': ['mqtt'],
'switch': ['mqtt'],
}
ALREADY_DISCOVERED = 'mqtt_discovered_components'
@asyncio.coroutine
def async_start(hass, discovery_topic, hass_config):
"""Initialize of MQTT Discovery."""
# pylint: disable=unused-variable
@asyncio.coroutine
def async_device_message_received(topic, payload, qos):
"""Process the received message."""
match = TOPIC_MATCHER.match(topic)
if not match:
return
prefix_topic, component, node_id, object_id = match.groups()
try:
payload = json.loads(payload)
except ValueError:
_LOGGER.warning("Unable to parse JSON %s: %s", object_id, payload)
return
if component not in SUPPORTED_COMPONENTS:
_LOGGER.warning("Component %s is not supported", component)
return
payload = dict(payload)
platform = payload.get(CONF_PLATFORM, 'mqtt')
if platform not in ALLOWED_PLATFORMS.get(component, []):
_LOGGER.warning("Platform %s (component %s) is not allowed",
platform, component)
return
payload[CONF_PLATFORM] = platform
if CONF_STATE_TOPIC not in payload:
payload[CONF_STATE_TOPIC] = '{}/{}/{}{}/state'.format(
discovery_topic, component, '%s/' % node_id if node_id else '',
object_id)
if ALREADY_DISCOVERED not in hass.data:
hass.data[ALREADY_DISCOVERED] = set()
# If present, the node_id will be included in the discovered object id
discovery_id = '_'.join((node_id, object_id)) if node_id else object_id
discovery_hash = (component, discovery_id)
if discovery_hash in hass.data[ALREADY_DISCOVERED]:
_LOGGER.info("Component has already been discovered: %s %s",
component, discovery_id)
return
hass.data[ALREADY_DISCOVERED].add(discovery_hash)
_LOGGER.info("Found new component: %s %s", component, discovery_id)
yield from async_load_platform(
hass, component, platform, payload, hass_config)
yield from mqtt.async_subscribe(
hass, discovery_topic + '/#', async_device_message_received, 0)
return True
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