import threading

from params import rabittmq_connection

APPOINTMENT_QUEUE = "APPOINTMENT_QUEUE"


class MessageReceiver:

    def start_listener(self, callback):
        t = threading.Thread(target=self._run, args=(callback,))
        t.start()

    def _run(self, callback):

        channel = rabittmq_connection.channel()
        channel.queue_declare(queue=APPOINTMENT_QUEUE)
        channel.basic_consume(queue=APPOINTMENT_QUEUE,
                              auto_ack=True,
                              on_message_callback=callback)
        print(' [*] Waiting for messages. To exit press CTRL+C')
        channel.start_consuming()