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import datetime
import logging
import paho.mqtt.client as mqtt
import slugify
from django.conf import settings
from . import models
log = logging.getLogger(__name__)
class MQTTClient:
def __init__(self):
self.reconnect = True
self.connected = False
self.client = mqtt.Client()
self.client.on_connect = self.on_connect
self.client.on_disconnect = self.on_disconnect
self.client.on_message = self.on_message
def loop_forever(self):
self.connect()
self.client.loop_forever()
def loop_start(self):
self.connect()
self.client.loop_start()
def loop_stop(self):
self.disconnect(reconnect=False)
self.client.loop_stop()
def connect(self):
try:
self.client.connect(
settings.MQTT_SERVER,
settings.MQTT_PORT,
60, # TODO: make the keepalive configurable
)
except OSError as e:
log.warning("Could not connect to MQTT server")
log.warning(e)
def disconnect(self, reconnect: bool = True):
self.reconnect = reconnect
self.client.disconnect()
def on_connect(self, client, userdata, flags, rc):
log.info("Connected to MQTT")
self.connected = True
client.subscribe(settings.MQTT_TOPIC + "#")
def on_disconnect(self, client, userdata, rc):
log.info("Disconnected from MQTT")
self.connected = False
if self.reconnect:
self.connect()
def on_message(self, client, userdata, msg):
log.debug(
"Received msg %s %s", msg.topic, msg.payload.decode()
)
ts = int(datetime.datetime.now().timestamp())
topic = msg.topic.removeprefix(settings.MQTT_TOPIC)
dss = models.DataSource.objects.filter(topic=topic)
if not dss:
dss = [models.DataSource.objects.create(
topic=topic,
path=slugify.slugify(topic) + ".rrd",
)]
dss[0].save()
for ds in dss:
ds.update(ts, msg.payload.decode())
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