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MqttConsoleApp.py
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MqttConsoleApp.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'''
MqttConsoleApp.py
Base class for console PyQt5 application with MQTT inbox/outbox.
usage: python3 script.py [-h] [-s SERVER] [-p PORT] [-d] [-l LOGGER]
optional arguments:
-h, --help show this help message and exit
-s SERVER, --server SERVER
change MQTT server host
-p PORT, --port PORT change MQTT server port
-d, --debug set DEBUG log level
-l LOGGER, --logger LOGGER
use logging config file
To switch MQTT broker, kill the program and start again with new arguments.
'''
from constants import *
from PyQt5.QtCore import QCoreApplication, QSettings, pyqtSignal, pyqtSlot
import logging, logging.config
import argparse
import os
MQTT_KEEPALIVE = 15 # 15 seconds is default MQTT_KEEPALIVE in Arduino PubSubClient.h
class MqttConsoleApp(QCoreApplication):
messageReceived = pyqtSignal(str, str)
#__________________________________________________________________
def __init__(self, argv, client, debugging_mqtt=False):
super().__init__(argv)
self.setApplicationName(APPLICATIONNAME)
self.setOrganizationDomain(ORGANIZATIONDOMAIN)
self.setOrganizationName(ORGANIZATIONNAME)
Reg = QSettings()
self._definitions = {}
self._mqttSubscriptions = []
self._mqttInbox = None
self._mqttOutbox = None
if os.path.isfile('definitions.ini'):
definitions = QSettings('definitions.ini', QSettings.IniFormat)
for group in definitions.childGroups():
definitions.beginGroup(group)
if group == "mqtt":
for key in definitions.childKeys():
self._definitions[key] = definitions.value(key)
if key.startswith('mqtt-sub-'):
self._mqttSubscriptions.append(self._definitions[key])
if key == 'sketch-inbox':
self._mqttInbox = self._definitions[key]
self._mqttSubscriptions.append(self._mqttInbox)
if key == 'sketch-outbox':
self._mqttOutbox = self._definitions[key]
definitions.endGroup()
self._mqttClient = client
self._mqttConnected = False
self._mqttServerHost = Reg.value('host', MQTT_DEFAULT_HOST)
self._mqttServerPort = Reg.value('port', MQTT_DEFAULT_PORT, type=int)
self._mqttClient.on_connect = self._mqttOnConnect
self._mqttClient.on_disconnect = self._mqttOnDisconnect
self._mqttClient.on_message = self._mqttOnMessage
self._mqttClient.on_publish = self._mqttOnPublish
self._mqttClient.on_subscribe = self._mqttOnSubscribe
self._mqttClient.on_unsubscribe = self._mqttOnUnsubscribe
if debugging_mqtt:
self._mqttClient.on_log = self._mqttOnLog
parser = argparse.ArgumentParser()
parser.add_argument("-s", "--server", help="change MQTT server host", nargs=1)
parser.add_argument("-p", "--port", help="change MQTT server port", nargs=1, type=int)
parser.add_argument("-d", "--debug", help="set DEBUG log level", action='store_true')
parser.add_argument("-l", "--logger", help="use logging config file", nargs=1)
args = vars(parser.parse_args())
if args['server']:
self._mqttServerHost = args['server'][0]
Reg.setValue('host', self._mqttServerHost)
if args['port']:
self._mqttServerPort = args['port'][0]
Reg.setValue('port', self._mqttServerPort)
if args['logger'] and os.path.isfile(args['logger']):
logging.config.fileConfig(args['logger'])
if args['debug']:
self._logger = logging.getLogger('debug')
self._logger.setLevel(logging.DEBUG)
else:
self._logger = logging.getLogger('production')
self._logger.setLevel(logging.INFO)
elif os.path.isfile('logging.ini'):
logging.config.fileConfig('logging.ini')
if args['debug']:
self._logger = logging.getLogger('debug')
self._logger.setLevel(logging.DEBUG)
else:
self._logger = logging.getLogger('production')
self._logger.setLevel(logging.INFO)
else:
if args['debug']:
self._logger = logging.getLogger('debug')
self._logger.setLevel(logging.DEBUG)
else:
self._logger = logging.getLogger('production')
self._logger.setLevel(logging.INFO)
ch = logging.FileHandler(self.applicationName() + '.log', 'w')
ch.setLevel(logging.INFO)
self._logger.addHandler(ch)
#__________________________________________________________________
def isConnectedToMqttBroker(self):
return self._mqttConnected
#__________________________________________________________________
def _mqttOnConnect(self, client, userdata, flags, rc):
if rc == 0:
self._mqttConnected = True
#self._logger.debug("Connected to MQTT server with flags: ", flags) # flags is dict
self._logger.info(self.tr("Program connected to MQTT server"))
if self._mqttOutbox:
try:
message = "CONNECTED"
(result, mid) = self._mqttClient.publish(self._mqttOutbox, message, qos=MQTT_DEFAULT_QoS, retain=True)
self._logger.info("{0} '{1}' (mid={2}) on {3}".format(self.tr("Program sending message"), message, mid, self._mqttOutbox))
except Exception as e:
self._logger.error("{0} '{1}' on {2}".format(self.tr("MQTT API : failed to call publish() for"), message, self._mqttOutbox))
self._logger.debug(e)
for topic in self._mqttSubscriptions:
try:
(result, mid) = self._mqttClient.subscribe(topic, MQTT_DEFAULT_QoS)
self._logger.info("{0} (mid={1}) : {2}".format(self.tr("Program subscribing to topic"), mid, topic))
except Exception as e:
self._logger.error(self.tr("MQTT API : failed to call subscribe()"))
self._logger.debug(e)
elif rc == 1:
self._logger.warning(self.tr("Program failed to connect to MQTT server : connection refused - incorrect protocol version"))
elif rc == 2:
self._logger.warning(self.tr("Program failed to connect to MQTT server : connection refused - invalid client identifier"))
elif rc == 3:
self._logger.warning(self.tr("Program failed to connect to MQTT server : connection refused - server unavailable"))
elif rc == 4:
self._logger.warning(self.tr("Program failed to connect to MQTT server : connection refused - bad username or password"))
elif rc == 5:
self._logger.warning(self.tr("Program failed to connect to MQTT server : connection refused - not authorised"))
else:
self._logger.warning("{0} {1}".format(self.tr("Program failed to connect to MQTT server : return code was"), rc))
#__________________________________________________________________
def _mqttOnDisconnect(self, client, userdata, rc):
self._mqttConnected = False
self._logger.info(self.tr("Program disconnected from MQTT server"))
serv = ''
if isinstance(userdata, str):
try:
mydata = eval(userdata)
if isinstance(mydata, dict) and 'host' in mydata and 'port' in mydata:
serv = mydata['host'] + ':' + str(mydata['port'])
except Exception as e:
self._logger.debug(self.tr("MQTT client userdata not as expected"))
self._logger.debug(e)
if serv:
self._logger.warning("{0}{1} {2} {3}".format(self.tr("Disconnected from MQTT server with rc="), rc, self.tr("from"), serv))
else:
self._logger.warning("{0}{1}".format(self.tr("Disconnected from MQTT server with rc="), rc))
#__________________________________________________________________
def _mqttOnLog(self, client, userdata, level, buf):
self._logger.debug("Paho log level {0} : {1}".format(level, buf))
#__________________________________________________________________
def _mqttOnMessage(self, client, userdata, msg):
message = None
try:
message = msg.payload.decode(encoding="utf-8", errors="strict")
except:
pass
if message:
self._logger.info(self.tr("Message received : '") + message + self.tr("' in ") + msg.topic)
self.messageReceived.emit(msg.topic, message)
else:
self._logger.warning("{0} {1}".format(self.tr("MQTT message decoding failed on"), msg.topic))
#__________________________________________________________________
def _mqttOnPublish(self, client, userdata, mid):
self._logger.debug("MQTT message is published : mid=%s userdata=%s", mid, userdata)
self._logger.info("{0} (mid={1})".format(self.tr("Message published"), mid))
#__________________________________________________________________
def _mqttOnSubscribe(self, client, userdata, mid, granted_qos):
self._logger.debug("MQTT topic is subscribed : mid=%s granted_qos=%s", mid, granted_qos) # granted_qos is (2,)
self._logger.info("{0} (mid={1}) {2} {3}".format(self.tr("Program susbcribed to topic"), mid, self.tr("with QoS"), granted_qos)) # mid is a number (count)
#__________________________________________________________________
def _mqttOnUnsubscribe(self, client, userdata, mid):
self._logger.debug("MQTT topic is unsubscribed : mid=%s", mid)
self._logger.info("{0} (mid={1})".format(self.tr("Program has been unsusbcribed from topic"), mid))
#__________________________________________________________________
def publishMessage(self, topic, message):
if not topic:
self._logger.warning("{0} : '{1}'".format(self.tr("Program failed to send message (no topic)"), message))
elif self._mqttConnected:
try:
(result, mid) = self._mqttClient.publish(topic, message, qos=MQTT_DEFAULT_QoS, retain=False)
self._logger.info("{0} '{1}' (mid={2}) on {3}".format(self.tr("Program sending message"), message, mid, topic))
except Exception as e:
self._logger.error("{0} '{1}' on {2}".format(self.tr("MQTT API : failed to call publish() for"), message, topic))
self._logger.debug(e)
else:
self._logger.warning("{0} : '{1}'".format(self.tr("Program failed to send message (disconnected)"), message))
#__________________________________________________________________
@pyqtSlot()
def quit(self, a=None, b=None):
QCoreApplication.quit()
#__________________________________________________________________
def start(self):
if self._mqttOutbox:
try:
self._mqttClient.will_set(self._mqttOutbox, payload="DISCONNECTED", qos=1, retain=True)
except Exception as e:
self._logger.error(self.tr("MQTT API : failed to call will_set()"))
self._logger.debug(e)
mydata = { 'host': self._mqttServerHost, 'port': self._mqttServerPort }
self._mqttClient.user_data_set(str(mydata))
'''
The loop_start() starts a new thread, that calls the loop method at
regular intervals for you. It also handles re-connects automatically.
'''
self._mqttClient.loop_start()
'''
If you use client.connect_async(), your client must use the
threaded interface client.loop_start()
'''
try:
self._mqttClient.connect_async(self._mqttServerHost, port = self._mqttServerPort, keepalive = MQTT_KEEPALIVE)
except Exception as e:
self._logger.error(self.tr("MQTT API : failed to call connect_async()"))
self._logger.debug(e)