srne-mqtt/consumers/mqtt.py

# -*- coding: utf-8 -*-
from typing import Any, Dict, List, Optional
from uuid import uuid4

import paho.mqtt.client as mqtt

from . import BaseConsumer

# MAP_VALUES = {}


class MqttConsumer(BaseConsumer):
    client: mqtt.Client
    initialized: List[str]

    def __init__(self, settings: Dict[str, Any]) -> None:
        self.initialized = []

        super().__init__(settings)
        self.client = mqtt.Client(client_id=settings["client"]["id"], userdata=self)
        self.client.on_connect = self.on_connect
        self.client.on_message = self.on_message
        # Will must be set before connecting!!
        self.client.will_set(
            f"{self.topic_prefix}/available", payload="offline", retain=True
        )
        self.client.connect(
            settings["client"]["host"],
            settings["client"]["port"],
            settings["client"]["keepalive"],
        )

    def config(self, settings: Dict[str, Any]):
        super().config(settings)
        settings.setdefault("client", {})
        settings["client"].setdefault("id", None)
        settings["client"].setdefault("host", "")
        settings["client"].setdefault("port", 1883)
        settings["client"].setdefault("keepalive", 60)

        if not settings.get("device_id"):
            settings["device_id"] = str(uuid4())

        settings.setdefault("prefix", "solarmppt")

        settings.setdefault("discovery_prefix", "homeassistant")

    @property
    def topic_prefix(self):
        return f"{self.settings['prefix']}/{self.settings['device_id']}"

    def get_ha_config(
        self,
        id,
        name,
        unit: Optional[str] = None,
        type: Optional[str] = None,
        expiry: int = 90,
        state_class: Optional[str] = None,
    ):
        assert state_class in [None, "measurement", "total", "total_increasing"]

        res = {
            "~": f"{self.topic_prefix}",
            "unique_id": f"{self.settings['device_id']}_{id}",
            "availability_topic": "~/available",
            "state_topic": f"~/{id}",
            "device": {
                "identifiers": [
                    self.settings["device_id"],
                ],
                # TODO: Get charger serial and use for identifier instead
                # See: https://www.home-assistant.io/integrations/sensor.mqtt/#device
                # "via_device": self.settings["device_id"],
            },
            "force_update": True,
            "expire_after": expiry,
        }

        if unit:
            res["unit_of_meas"] = unit
        if type:
            res["dev_cla"] = type
        if state_class:
            res["state_class"] = state_class

    # The callback for when the client receives a CONNACK response from the server.
    @staticmethod
    def on_connect(client: mqtt.Client, userdata: "MqttConsumer", flags, rc):
        print("Connected with result code " + str(rc))

        # Subscribing in on_connect() means that if we lose the connection and
        # reconnect then subscriptions will be renewed.
        # client.subscribe("$SYS/#")
        client.publish(
            f"{userdata.topic_prefix}/available", payload="online", retain=True
        )

    # The callback for when a PUBLISH message is received from the server.
    @staticmethod
    def on_message(client, userdata, msg):
        print(msg.topic + " " + str(msg.payload))

    def poll(self):
        self.client.loop(timeout=0.1, max_packets=5)
        return super().poll()

    def write(self, data: Dict[str, Any]):
        self.client.publish(f"{self.topic_prefix}/raw", payload=data)
        return super().write(data)

    def exit(self):
        self.client.publish(
            f"{self.topic_prefix}/available", payload="offline", retain=True
        )

        while self.client.want_write():
            self.client.loop_write(10)

        self.client.disconnect()
        return super().exit()


# Client(client_id="", clean_session=True, userdata=None,
# protocol=MQTTv311, transport="tcp")

# connect_srv(domain, keepalive=60, bind_address="")
# Connect to a broker using an SRV DNS lookup to obtain the broker address.
# Takes the following arguments:
# domain
#    the DNS domain to search for SRV records.
# If None, try to determine the local domain name.

# client.will_set(topic, payload=None, qos=0, retain=False)

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.

# client.loop_forever()