Make tfw.networking more structured, remove relative import hell

lib/tfw/networking/event_handlers/server_connector.py

@@ -0,0 +1,38 @@
+import zmq
+from functools import partial
+from zmq.eventloop import ioloop
+from zmq.eventloop.zmqstream import ZMQStream
+
+from tfw.networking.serialization import serialize_all
+from tfw.config import PUBLISHER_PORT, RECEIVER_PORT
+from tfw.util import ZMQConnectorBase
+
+
+ioloop.install()
+
+
+class ServerDownlinkConnector(ZMQConnectorBase):
+    def __init__(self, zmq_context=None):
+        super(ServerDownlinkConnector, self).__init__(zmq_context)
+        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.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
+
+
+class ServerUplinkConnector(ZMQConnectorBase):
+    def __init__(self, zmq_context=None):
+        super(ServerUplinkConnector, self).__init__(zmq_context)
+        self._zmq_push_socket = self._zmq_context.socket(zmq.PUSH)
+        self._zmq_push_socket.connect('tcp://localhost:{}'.format(RECEIVER_PORT))
+
+    def send(self, anchor, response):
+        self._zmq_push_socket.send_multipart(serialize_all(anchor, response))
+
+
+class ServerConnector(ServerUplinkConnector, ServerDownlinkConnector):
+    def __init__(self, zmq_context=None):
+        super(ServerConnector, self).__init__(zmq_context)