221 lines
8.1 KiB
Python
221 lines
8.1 KiB
Python
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""" powermon / libs / mqttbroker.py """
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import logging
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from time import sleep
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import paho.mqtt.client as mqtt_client
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from powermon.libs.config import safe_config
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# Set-up logger
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log = logging.getLogger("mqttbroker")
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class MqttBroker:
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""" Wrapper for mqtt broker connectivity and message proccessing """
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def __str__(self):
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if self.disabled:
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return "MqttBroker DISABLED"
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else:
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return f"MqttBroker name: {self.name}, port: {self.port}, user: {self.username}"
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@classmethod
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def from_config(cls, config=None) -> 'MqttBroker':
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""" build the mqtt broker object from a config dict """
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log.debug("mqttbroker config: %s", safe_config(config))
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if config:
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name = config.get("name")
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port = config.get("port", 1883)
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username = config.get("username")
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password = config.get("password")
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mqtt_broker = cls(name=name, port=port, username=username, password=password)
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mqtt_broker.adhoc_topic = config.get("adhoc_topic")
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mqtt_broker.adhoc_result_topic = config.get("adhoc_result_topic")
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return mqtt_broker
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else:
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return cls(name=None)
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def __init__(self, name, port=None, username=None, password=None):
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self.name = name
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self.port = port
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self.username = username
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self.password = password
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self.is_connected = False
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if self.name is None:
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self.disabled = True
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else:
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self.disabled = False
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self.mqttc = mqtt_client.Client()
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@property
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def adhoc_topic(self) -> str:
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""" return the adhoc command topic """
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return getattr(self, "_adhoc_topic", None)
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@adhoc_topic.setter
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def adhoc_topic(self, value):
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log.debug("setting adhoc topic to: %s", value)
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self._adhoc_topic = value
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@property
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def adhoc_result_topic(self) -> str:
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""" return the adhoc result topic """
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return getattr(self, "_adhoc_result_topic", None)
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@adhoc_result_topic.setter
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def adhoc_result_topic(self, value):
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log.debug("setting adhoc result topic to: %s", value)
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self._adhoc_result_topic = value
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def on_connect(self, client, userdata, flags, rc):
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""" callback for connect """
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# 0: Connection successful
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# 1: Connection refused - incorrect protocol version
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# 2: Connection refused - invalid client identifier
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# 3: Connection refused - server unavailable
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# 4: Connection refused - bad username or password
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# 5: Connection refused - not authorised
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# 6-255: Currently unused.
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log.debug("on_connect called - client: %s, userdata: %s, flags: %s", client, userdata, flags)
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connection_result = [
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"Connection successful",
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"Connection refused - incorrect protocol version",
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"Connection refused - invalid client identifier",
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"Connection refused - server unavailable",
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"Connection refused - bad username or password",
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"Connection refused - not authorised",
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]
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log.debug("MqttBroker connection returned result: %s %s", rc, connection_result[rc])
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if rc == 0:
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self.is_connected = True
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return
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self.is_connected = False
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def on_disconnect(self, client, userdata, rc):
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""" callback for disconnect """
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log.debug("on_disconnect called - client: %s, userdata: %s, rc: %s", client, userdata, rc)
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self.is_connected = False
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def connect(self):
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""" connect to mqtt broker """
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if self.disabled:
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log.info("MQTT broker not enabled, was a broker name defined? '%s'", self.name)
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return
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if not self.name:
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log.info("MQTT could not connect as no broker name")
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return
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self.mqttc.on_connect = self.on_connect
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self.mqttc.on_disconnect = self.on_disconnect
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# if name is screen just return without connecting
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if self.name == "screen":
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# allows checking of message formats
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return
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try:
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log.debug("Connecting to %s on port %s", self.name, self.port)
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if self.username:
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# auth = {"username": mqtt_user, "password": mqtt_pass}
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_password = "********" if self.password is not None else "None"
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log.info("Using mqtt authentication, username: %s, password: %s", self.username, _password)
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self.mqttc.username_pw_set(self.username, password=self.password)
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else:
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log.debug("No mqtt authentication used")
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# auth = None
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self.mqttc.connect(self.name, port=self.port, keepalive=60)
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self.mqttc.loop_start()
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sleep(1)
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except (ConnectionRefusedError, OSError) as ex:
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log.warning("%s connection failed: '%s'", self.name, ex)
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def start(self):
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""" start mqtt broker """
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if self.disabled:
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return
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if self.is_connected:
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self.mqttc.loop_start()
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def stop(self):
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""" stop mqtt broker """
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log.debug("Stopping mqttbroker connection")
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if self.disabled:
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return
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self.mqttc.loop_stop()
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# def set(self, variable, value):
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# setattr(self, variable, value)
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# def update(self, variable, value):
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# # only override if value is not None
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# if value is None:
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# return
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# setattr(self, variable, value)
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def subscribe(self, topic, callback):
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""" subscribe to a mqtt topic """
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if not self.name:
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return
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if self.disabled:
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return
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# check if connected, connect if not
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if not self.is_connected:
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log.debug("Not connected, connecting")
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self.connect()
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# Register callback
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self.mqttc.on_message = callback
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if self.is_connected:
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# Subscribe to command topic
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log.debug("Subscribing to topic: %s", topic)
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self.mqttc.subscribe(topic, qos=0)
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else:
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log.warning("Did not subscribe to topic: %s as not connected to broker", topic)
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def post_adhoc_command(self, command_code):
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""" shortcut function to publish an adhoc command """
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self.publish(topic=self.adhoc_topic, payload=command_code)
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def post_adhoc_result(self, payload):
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""" shortcut function to publish the results of an adhoc command """
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self.publish(topic=self.adhoc_result_topic, payload=payload)
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def publish(self, topic: str = None, payload: str = None):
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""" function to publish messages to mqtt broker """
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if self.disabled:
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log.debug("Cannot publish msg as mqttbroker disabled")
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return
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# log.debug("Publishing '%s' to '%s'", payload, topic)
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if self.name == "screen":
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print(f"mqtt debug - topic: '{topic}', payload: '{payload}'")
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return
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# check if connected, connect if not
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if not self.is_connected:
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log.debug("Not connected, connecting")
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self.connect()
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sleep(1)
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if not self.is_connected:
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log.warning("mqtt broker did not connect")
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return
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if isinstance(topic, bytes):
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topic = topic.decode('utf-8')
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if isinstance(payload, bytes):
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payload = payload.decode('utf-8')
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try:
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infot = self.mqttc.publish(topic, payload)
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infot.wait_for_publish(5)
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except (OSError, RuntimeError, ValueError) as e:
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log.warning("mqtt publish failed: %s", e)
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# def setAdhocCommands(self, config={}, callback=None):
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# if not config:
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# return
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# if self.disabled:
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# log.debug("Cannot setAdhocCommands as mqttbroker disabled")
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# return
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# adhoc_commands = config.get("adhoc_commands")
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# # sub to command topic if defined
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# adhoc_commands_topic = adhoc_commands.get("topic")
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# if adhoc_commands_topic is not None:
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# log.info("Setting adhoc commands topic to %s", adhoc_commands_topic)
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# self.subscribe(adhoc_commands_topic, callback)
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