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Reconnection logic for MQTT disconnections caused by temporary errors

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This commit is contained in:
Fabio Manganiello 2021-03-22 01:51:49 +01:00
parent 782be7794b
commit 928bb3667a
1 changed files with 20 additions and 0 deletions
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20
platypush/backend/mqtt.py
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@ -1,6 +1,8 @@
import json
import logging
import os
import threading
import time
from typing import Optional, List, Callable
import paho.mqtt.client as mqtt
@ -16,6 +18,8 @@ from platypush.utils import set_thread_name
class MqttClient(mqtt.Client, threading.Thread):
_reconnect_timeout = 10.0
def __init__(self, *args, host: str, port: int, topics: Optional[List[str]] = None,
on_message: Optional[Callable] = None, username: Optional[str] = None, password: Optional[str] = None,
client_id: Optional[str] = None, tls_cafile: Optional[str] = None, tls_certfile: Optional[str] = None,
@ -29,6 +33,8 @@ class MqttClient(mqtt.Client, threading.Thread):
self.topics = set(topics or [])
self.keepalive = keepalive
self.on_connect = self.connect_hndl()
self.on_disconnect = self.disconnect_hndl()
self.logger = logging.getLogger(__name__)
if on_message:
self.on_message = on_message
@ -73,6 +79,20 @@ class MqttClient(mqtt.Client, threading.Thread):
return handler
def disconnect_hndl(self):
# noinspection PyUnusedLocal
def handler(client, userdata, rc):
if not self._stop_scheduled and rc in {mqtt.MQTT_ERR_INVAL, mqtt.MQTT_ERR_AGAIN, mqtt.MQTT_ERR_CONN_LOST,
mqtt.MQTT_ERR_CONN_REFUSED, mqtt.MQTT_ERR_NOMEM, mqtt.MQTT_ERR_ERRNO,
mqtt.MQTT_ERR_NO_CONN, mqtt.MQTT_ERR_PAYLOAD_SIZE,
mqtt.MQTT_ERR_QUEUE_SIZE, mqtt.MQTT_ERR_UNKNOWN}:
self.logger.warning('Unexpected disconnection from {}:{}. MQTT error: {}'.format(
self.host, self.port, rc))
time.sleep(self._reconnect_timeout)
self.connect(host=self.host, port=self.port, keepalive=self.keepalive)
return handler
def run(self):
super().run()
self.connect(host=self.host, port=self.port, keepalive=self.keepalive)