add consume register function

src/flask_rabbit_broker.py

@@ -27,6 +27,7 @@ class FlaskRabbitBroker:
         self.routing_key = None
         self.connection = None
         self.channel = None
+        self.exchange = None
 
     def init_app(self, app) -> None:
         """
@@ -64,13 +65,24 @@ class FlaskRabbitBroker:
         """
         channel = self.connection.channel()
         try:
-            channel.exchange_declare(exchange=self.exchange_name,
+            exchange = channel.exchange_declare(exchange=self.exchange_name,
                                      exchange_type='fanout',
                                      durable=True,
                                      auto_delete=False)
         finally:
             channel.close()
 
+    def register_callback(self, callback) -> None:
+        """
+        Register a callback.
+        :param callback:
+        :return:
+        """
+        channel = self.connection.channel()
+        queue = channel.queue_declare(durable=True, auto_delete=False)
+        queue.bind(self.exchange)
+        queue.basic_consume(callback, no_ack=True)
+
     def send(self, message: str) -> None:
         """
         Sends a message to the declared exchange.