Add Component class describing an event handler

component.py

@@ -0,0 +1,31 @@
+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))