240 lines
9 KiB
Python
240 lines
9 KiB
Python
import json
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import os
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import threading
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from platypush.backend import Backend
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from platypush.context import get_plugin
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from platypush.message import Message
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from platypush.message.event.mqtt import MQTTMessageEvent
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from platypush.message.request import Request
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from platypush.utils import set_thread_name
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class MqttBackend(Backend):
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"""
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Backend that reads messages from a configured MQTT topic (default:
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``platypush_bus_mq/<device_id>``) and posts them to the application bus.
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Triggers:
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* :class:`platypush.message.event.mqtt.MQTTMessageEvent` when a new
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message is received on one of the custom listeners
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Requires:
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* **paho-mqtt** (``pip install paho-mqtt``)
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"""
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_default_mqtt_port = 1883
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def __init__(self, host, port=_default_mqtt_port, topic='platypush_bus_mq',
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tls_cafile=None, tls_certfile=None, tls_keyfile=None,
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tls_version=None, tls_ciphers=None, username=None,
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password=None, listeners=None, *args, **kwargs):
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"""
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:param host: MQTT broker host
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:type host: str
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:param port: MQTT broker port (default: 1883)
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:type port: int
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:param topic: Topic to read messages from (default: ``platypush_bus_mq/<device_id>``)
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:type topic: str
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:param tls_cafile: If TLS/SSL is enabled on the MQTT server and the certificate requires a certificate authority to authenticate it, `ssl_cafile` will point to the provided ca.crt file (default: None)
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:type tls_cafile: str
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:param tls_certfile: If TLS/SSL is enabled on the MQTT server and a client certificate it required, specify it here (default: None)
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:type tls_certfile: str
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:param tls_keyfile: If TLS/SSL is enabled on the MQTT server and a client certificate key it required, specify it here (default: None)
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:type tls_keyfile: str
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:param tls_version: If TLS/SSL is enabled on the MQTT server and it requires a certain TLS version, specify it here (default: None)
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:type tls_version: str
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:param tls_ciphers: If TLS/SSL is enabled on the MQTT server and an explicit list of supported ciphers is required, specify it here (default: None)
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:type tls_ciphers: str
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:param username: Specify it if the MQTT server requires authentication (default: None)
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:type username: str
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:param password: Specify it if the MQTT server requires authentication (default: None)
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:type password: str
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:param listeners: If specified then the MQTT backend will also listen for
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messages on the additional configured message queues. This parameter
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is a list of maps where each item supports the same arguments passed
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to the main backend configuration (host, port, topic, password etc.).
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Note that the message queue configured on the main configuration
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will expect valid Platypush messages that then can execute, while
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message queues registered to the listeners will accept any message.
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:type listeners: list[dict]
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"""
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super().__init__(*args, **kwargs)
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self.host = host
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self.port = port
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self.topic = '{}/{}'.format(topic, self.device_id)
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self.username = username
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self.password = password
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self._client = None
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self._listeners = []
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self.tls_cafile = os.path.abspath(os.path.expanduser(tls_cafile)) \
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if tls_cafile else None
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self.tls_certfile = os.path.abspath(os.path.expanduser(tls_certfile)) \
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if tls_certfile else None
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self.tls_keyfile = os.path.abspath(os.path.expanduser(tls_keyfile)) \
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if tls_keyfile else None
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self.tls_version = tls_version
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self.tls_ciphers = tls_ciphers
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self.listeners_conf = listeners or []
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def send_message(self, msg):
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try:
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client = get_plugin('mqtt')
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client.send_message(topic=self.topic, msg=msg, host=self.host,
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port=self.port, username=self.username,
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password=self.password, tls_cafile=self.tls_cafile,
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tls_certfile=self.tls_certfile,
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tls_keyfile=self.tls_keyfile,
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tls_version=self.tls_version,
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tls_ciphers=self.tls_ciphers)
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except Exception as e:
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self.logger.exception(e)
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def _initialize_listeners(self, listeners_conf):
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import paho.mqtt.client as mqtt
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def listener_thread(client, host, port):
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client.connect(host, port, 60)
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client.loop_forever()
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def on_connect(topic):
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def handler(client, userdata, flags, rc):
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client.subscribe(topic)
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return handler
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def on_message(client, userdata, msg):
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data = msg.payload
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try:
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data = data.decode('utf-8')
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data = json.loads(data)
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except:
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pass
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self.bus.post(MQTTMessageEvent(host=client._host, port=client._port,
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topic=msg.topic, msg=data))
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for i, listener in enumerate(listeners_conf):
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host = listener.get('host')
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port = listener.get('port', self._default_mqtt_port)
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topic = listener.get('topic')
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username = listener.get('username')
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password = listener.get('password')
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tls_cafile = listener.get('tls_cafile')
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if not host or not topic:
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self.logger.warning('No host nor topic specified for listener ' +
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'n.{}'.format(i+1))
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continue
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client = mqtt.Client()
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client.on_connect = on_connect(topic)
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client.on_message = on_message
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if username and password:
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client.username_pw_set(username, password)
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if tls_cafile:
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client.tls_set(ca_certs=tls_cafile,
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certfile=listener.get('tls_certfile'),
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keyfile=listener.get('tls_keyfile'),
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tls_version=listener.get('tls_version'),
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ciphers=listener.get('tls_ciphers'))
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threading.Thread(target=listener_thread, kwargs = {
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'client': client, 'host': host, 'port': port }).start()
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def run(self):
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def on_connect(client, userdata, flags, rc):
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client.subscribe(self.topic)
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def on_message(client, userdata, msg):
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def response_thread(msg):
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set_thread_name('MQTTProcessor')
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response = self.get_message_response(msg)
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if not response:
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return
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response_topic = '{}/responses/{}'.format(self.topic, msg.id)
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self.logger.info('Processing response on the MQTT topic {}: {}'.
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format(response_topic, response))
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self.send_message(response)
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msg = msg.payload.decode('utf-8')
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try: msg = Message.build(json.loads(msg))
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except: pass
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if not msg: return
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self.logger.info('Received message on the MQTT backend: {}'.format(msg))
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try:
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self.on_message(msg)
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except Exception as e:
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self.logger.exception(e)
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return
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if isinstance(msg, Request):
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threading.Thread(target=response_thread,
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name='MQTTProcessor',
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args=(msg,)).start()
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import paho.mqtt.client as mqtt
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super().run()
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self._client = mqtt.Client()
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self._client.on_connect = on_connect
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self._client.on_message = on_message
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if self.username and self.password:
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self._client.username_pw_set(self.username, self.password)
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if self.tls_cafile:
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self._client.tls_set(ca_certs=self.tls_cafile, certfile=self.tls_certfile,
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keyfile=self.tls_keyfile, tls_version=self.tls_version,
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ciphers=self.tls_ciphers)
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self._client.connect(self.host, self.port, 60)
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self.logger.info('Initialized MQTT backend on host {}:{}, topic {}'.
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format(self.host, self.port, self.topic))
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self._initialize_listeners(self.listeners_conf)
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self._client.loop_forever()
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def stop(self):
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self.logger.info('Received STOP event on MqttBackend')
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if self._client:
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self._client.disconnect()
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self._client.loop_stop()
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self._client = None
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for listener in self._listeners:
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try:
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listener.loop_stop()
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except Exception as e:
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self.logger.warning('Could not stop listener ' +
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'{host}:{port}: {error}'.format(
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host=listener._host, port=listener._port,
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error=str(e)))
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# vim:sw=4:ts=4:et:
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