baseimage-tutorial-framework/component.py

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import json
from functools import partial
import zmq
from zmq.eventloop.zmqstream import ZMQStream
from zmq.eventloop import ioloop
from config import RECEIVER_PORT, PUBLISHER_PORT
ioloop.install()
class Component:
def __init__(self, anchor, event_handler, zmq_context=None):
self.anchor = anchor
self.event_handler = event_handler
self.zmq_context = zmq_context or zmq.Context.instance()
self.zmq_sub_socket = self.zmq_context.socket(zmq.SUB)
self.zmq_sub_socket.setsockopt_string(zmq.SUBSCRIBE, anchor)
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))
def wrapper(msg_parts, handler):
anchor, message = msg_parts
data_json = json.loads(message)
response = json.dumps(handler(data_json)).encode('utf-8')
self.zmq_push_socket.send_multipart([anchor, response])
self.zmq_sub_stream.on_recv(partial(wrapper, handler=event_handler))