termination mechanism integrated

src/digitaltwin1.py

@@ -1,14 +1,23 @@
 from loguru import logger
 import argparse
 import configparser
+import threading
 
 from ProcessImage import ProcessImage
-from ModbusHandler import modbusStart
-from MqttEventPublisher import mqttEventPublisherStart
-from MqttPeriodPublisher import mqttPeriodPublisherStart
-from MqttCoilSubscriber import mqttCoilSubscriberStart
+from ModbusHandler import ModbusHandler
+from MqttEventPublisher import MqttEventPublisher, mqttEventPublisherStart
+from MqttPeriodPublisher import MqttPeriodPublisher
+from MqttCoilSubscriber import MqttCoilSubscriber
 
 
+deathBell = threading.Event()
+
+def exceptHook(args):
+    global deathBell
+    logger.error("Exception in thread caught: {}".format(args))
+    deathBell.set()
+    logger.error("rang the death bell")
+
 
 logger.info("DigitalTwin1 starting")
 
@@ -27,17 +36,44 @@ config.read(args.config)
 
 processImage = ProcessImage()
 
-modbusStart(config, processImage)
+modbusHandlerThread = ModbusHandler(config, processImage)
+modbusHandlerThread.start()
 logger.info("Modbus handler running")
 
-mqttEventPublisherStart(config, processImage)
+mqttEventPublisherThread = MqttEventPublisher(config, processImage)
+mqttEventPublisherThread.start()
 logger.info("MQTT event publisher running")
 
-mqttPeriodPublisherStart(config, processImage)
+mqttPeriodPublisherThread = MqttPeriodPublisher(config, processImage)
+mqttPeriodPublisherThread.start()
 logger.info("MQTT period publisher running")
 
-mqttCoilSubscriberStart(config, processImage)
+mqttCoilSubscriberThread = MqttCoilSubscriber(config, processImage)
+mqttCoilSubscriberThread.start()
 logger.info("MQTT coil subscriber running")
 
+threading.excepthook = exceptHook
+logger.info("Threading excepthook set")
+
 logger.info("DigitalTwin1 running")
 
+
+deathBell.wait()
+logger.error("DigitalTwin1 is dying")
+
+modbusHandlerThread.stop()
+mqttEventPublisherThread.stop()
+mqttPeriodPublisherThread.stop()
+mqttCoilSubscriberThread.stop()
+
+modbusHandlerThread.join()
+logger.error("modbusHandlerThread joined")
+mqttEventPublisherThread.join()
+logger.error("mqttEventPublisherThread joined")
+mqttPeriodPublisherThread.join()
+logger.error("mqttPeriodPublisherThread joined")
+mqttCoilSubscriberThread.join()
+logger.error("mqttCoilSubscriberThread joined")
+
+logger.error("DigitalTwin1 to terminate")
+