Copy from https://git.chch.tech/chchtech/mqtt-influx

mqttinflux/main.py

@@ -1,20 +1,68 @@
 import paho.mqtt.client as mqtt
 from influxdb import InfluxDBClient
+from influxdb.exceptions import InfluxDBClientError
+from influxdb.exceptions import InfluxDBServerError
 import datetime
 import logging
 import json
 import os
+import ssl
+import traceback
+import os
+import configparser
+
+class App:
+    def __init__(self):
+        with open("mqtt-influx.json", 'r') as f:
+            self.config = json.load(f)
+        debug = os.environ.get("DEBUG")
+        if debug:
+            level = logging.INFO
+        else: 
+            level = logging.WARNING
+        logging.basicConfig(level=level)
 
 
-def on_connect(client, userdata, flags, rc):
-    for topic in topics:
+        self.mqttInit()
+        self.influxInit()
+
+    def mqttInit(self):
+        self.topics = ["sensors"] 
+        self.client = mqtt.Client()
+        self.client.username_pw_set(self.config["mqtt"]["user"], 
+            self.config["mqtt"]["password"])
+        self.client.tls_set(cert_reqs=ssl.CERT_REQUIRED,
+            tls_version=ssl.PROTOCOL_TLS)
+        self.client.on_connect = self.on_connect
+        self.client.on_message = self.on_message
+
+        try:
+            self.client.connect(self.config["mqtt"]["host"], self.config["mqtt"]["port"], 60)
+        except:
+            logging.critical("Failed to connect to MQTT server")
+            exit(1)
+
+    def influxInit(self):
+        try:
+            self.influx_client = InfluxDBClient(self.config["influx"]["host"],
+                self.config["influx"]["port"], 
+                database=self.config["influx"]["database"])
+            self.influx_client.create_database("sensors")
+        except Exception as e:
+            logging.critical("Failed to connect to database %s", e)
+            exit(1)
+    
+    def start(self):
+        logging.info("Starting")
+        self.client.loop_forever()
+
+    def on_connect(self, client, userdata, flags, rc):
+        for topic in self.config["mqtt"]["topics"]:
             client.subscribe(topic)
 
-
-def on_message(client, userdata, msg):
+    def on_message(self, client, userdata, msg):
         current_time = datetime.datetime.utcnow().isoformat()
         data = json.loads(msg.payload)
-    print(data)
         json_body = [
             {
                 "measurement": msg.topic,
@@ -24,26 +72,17 @@ def on_message(client, userdata, msg):
             }
         ]
         logging.info(json_body)
-    influx_client.write_points(json_body)
-   
-if 'TOPICS' not in os.environ:
-    print("At least one topic is needed.")
+        try: 
+            self.influx_client.write_points(json_body)
+        except InfluxDBClientError as e:
+            logging.error("Influx write error %s", e)
+        except Exception as e:
+            logging.critical("Influx server error %s", e)
+            traceback.print_exc()
             exit(1)
-topics = os.environ['TOPICS'].split(' ')   
-print(topics)
-
-logging.basicConfig(level=logging.INFO)
-influx_client = InfluxDBClient(os.environ['INFLUX_HOST'], int(os.environ['INFLUX_PORT']), database=os.environ["INFLUX_DB"])
-influx_client.create_database(os.environ["INFLUX_DB"])
 
 
-client = mqtt.Client()
+if __name__ == "__main__":
+    app = App()
+    app.start()
 
-client.on_connect = on_connect
-client.on_message = on_message
- 
-client.connect(os.environ['MQTT_HOST'], int(os.environ["MQTT_PORT"]), 60)
-
-print("Starting")
- 
-client.loop_forever()