96 lines
3.0 KiB
Python
96 lines
3.0 KiB
Python
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import sys
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import json
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from flask_mqtt import Mqtt
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from .models import Recording
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from app import db, app
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class MqttClient:
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class __MqttClient:
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def __init__(self):
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self.mqtt = Mqtt()
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self.initialized = False
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def __str__(self):
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return repr(self)
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instance = None
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def __init__(self):
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if not MqttClient.instance:
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MqttClient.instance = MqttClient.__MqttClient()
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def __getattr__(self, name):
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return getattr(self.instance, name)
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# Mqtt setup
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def setup(self, app):
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if not self.initialized:
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self.mqtt.init_app(app)
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self.mqtt.client.on_message = self.handle_mqtt_message
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self.mqtt.client.on_subscribe = self.handle_subscribe
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initialized = True
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@self.mqtt.on_connect()
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def handle_connect(client, userdata, flags, rc):
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print('MQTT client connected')
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self.mqtt.subscribe('device/+')
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@self.mqtt.on_disconnect()
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def handle_disconnect():
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print('MQTT client disconnected')
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print('MQTT client initialized')
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def tear_down(self):
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self.mqtt.unsubscribe_all()
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if hasattr(self.mqtt, 'client') and self.mqtt.client is not None:
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self.mqtt.client.disconnect()
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print('MQTT client destroyed')
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def handle_subscribe(self, client, userdata, mid, granted_qos):
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print('MQTT client subscribed')
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def handle_mqtt_message(self, client, userdata, message):
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print("Received message!")
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print("Topic: " + message.topic)
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print("Payload: " + message.payload.decode())
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try:
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# If type is JSON
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recording = self.parse_json_message(message.topic, message.payload.decode())
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with app.app_context():
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recording.save()
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except ValueError:
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print("ERROR!")
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error_type, error_instance, traceback = sys.exc_info()
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print("Type: " + str(error_type))
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print("Instance: " + str(error_instance))
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return
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def parse_json_message(self, topic, payload) -> Recording:
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try:
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json_msg = json.loads(payload)
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device_id = self.get_device_id(topic)
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return Recording(device_id=device_id,
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record_type=json_msg["record_type"],
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record_value=json_msg["record_value"],
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recorded_at=json_msg["recorded_at"],
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raw_json=json_msg)
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except KeyError:
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error_type, error_instance, traceback = sys.exc_info()
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raise ValueError("JSON parsing failed! Key error: "
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+ str(error_instance))
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def get_device_id(self, topic) -> int:
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device_token, device_id = topic.split("/")
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if device_token == "device":
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return int(device_id)
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else:
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raise ValueError("Topic is in invalid format")
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