refacto: reorganize POC into clean architecture for modularity

app/consumer/src/adapters/mqtt.py

@@ -0,0 +1,50 @@
+import json
+import logging
+from typing import Callable
+
+import paho.mqtt.client as mqtt
+from paho.mqtt.client import ConnectFlags
+from paho.mqtt.enums import CallbackAPIVersion
+from paho.mqtt.properties import Properties
+from paho.mqtt.reasoncodes import ReasonCode
+
+from entities import UplinkEvent
+from ports import MessageBroker
+
+log = logging.getLogger(__name__)
+
+
+class PahoMqttBroker(MessageBroker):
+    def __init__(self, host: str, port: int, topic: str):
+        self._host = host
+        self._port = port
+        self._topic = topic
+
+    def start(self, on_uplink: Callable[[UplinkEvent], None]) -> None:
+        _client = mqtt.Client(CallbackAPIVersion.VERSION2)
+
+        def _on_connect(
+            client: mqtt.Client,
+            userdata: None,
+            flags: ConnectFlags,
+            reason_code: ReasonCode,
+            props: Properties | None,
+        ) -> None:
+            log.info("MQTT connecté (code=%s)", reason_code)
+            client.subscribe(self._topic, qos=1)
+
+        def _on_message(client: mqtt.Client, userdata: None, msg: mqtt.MQTTMessage) -> None:
+            try:
+                body = json.loads(msg.payload)
+                dev_eui = body["deviceInfo"]["devEui"]
+                pulse_count = int(body["object"]["pulse_count"])
+
+                on_uplink(UplinkEvent(dev_eui=dev_eui, pulse_count=pulse_count))
+            except Exception as e:
+                log.exception("Erreur parsing message MQTT : %s", e)
+
+        _client.on_connect = _on_connect
+        _client.on_message = _on_message
+        _client.reconnect_delay_set(min_delay=1, max_delay=30)
+        _client.connect(self._host, self._port, keepalive=60)
+        _client.loop_forever()