baseimage-tutorial-framework/src/event_handlers/messaging.py

from functools import partial

import zmq
from zmq.eventloop import ioloop
from zmq.eventloop.zmqstream import ZMQStream

from config import PUBLISHER_PORT, RECEIVER_PORT

ioloop.install()


class Messaging:
    def __init__(self):
        self._zmq_context = zmq.Context.instance()
        self._zmq_sub_socket = self._zmq_context.socket(zmq.SUB)
        self._zmq_sub_socket.connect('tcp://localhost:{}'.format(PUBLISHER_PORT))
        self._zmq_sub_stream = ZMQStream(self._zmq_sub_socket)
        self._zmq_push_socket = self._zmq_context.socket(zmq.PUSH)
        self._zmq_push_socket.connect('tcp://localhost:{}'.format(RECEIVER_PORT))

        self.subscribe = partial(self._zmq_sub_socket.setsockopt_string, zmq.SUBSCRIBE)
        self.unsubscribe = partial(self._zmq_sub_socket.setsockopt_string, zmq.UNSUBSCRIBE)
        self.register_callback = self._zmq_sub_stream.on_recv
    
    def send(self, anchor, response):
        self._zmq_push_socket.send_multipart([anchor, response])