baseimage-tutorial-framework/lib/tfw/networking/server_connector.py

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import logging
import zmq
from zmq.eventloop.zmqstream import ZMQStream
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from .scope import Scope
from .serialization import serialize_tfw_msg, with_deserialize_tfw_msg
LOG = logging.getLogger(__name__)
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class ServerDownlinkConnector:
def __init__(self, connect_addr):
self.keys = []
self._on_recv_callback = None
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self._zmq_sub_socket = zmq.Context.instance().socket(zmq.SUB)
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self._zmq_sub_socket.setsockopt(zmq.RCVHWM, 0)
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self._zmq_sub_socket.connect(connect_addr)
self._zmq_sub_stream = ZMQStream(self._zmq_sub_socket)
def subscribe(self, *keys):
for key in keys:
self._zmq_sub_socket.setsockopt_string(zmq.SUBSCRIBE, key)
self.keys.append(key)
def unsubscribe(self, *keys):
for key in keys:
self._zmq_sub_socket.setsockopt_string(zmq.UNSUBSCRIBE, key)
self.keys.remove(key)
def register_callback(self, callback):
self._on_recv_callback = callback
self._zmq_sub_stream.on_recv(with_deserialize_tfw_msg(self._on_recv))
def _on_recv(self, message):
key = message['key']
if key in self.keys or '' in self.keys:
self._on_recv_callback(message)
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def close(self):
self._zmq_sub_stream.close()
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class ServerUplinkConnector:
def __init__(self, connect_addr):
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self._zmq_push_socket = zmq.Context.instance().socket(zmq.PUSH)
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self._zmq_push_socket.setsockopt(zmq.SNDHWM, 0)
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self._zmq_push_socket.connect(connect_addr)
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def send_message(self, message, scope=Scope.ZMQ):
message['scope'] = scope.value
self._zmq_push_socket.send_multipart(serialize_tfw_msg(message))
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def close(self):
self._zmq_push_socket.close()
class ServerConnector(ServerDownlinkConnector, ServerUplinkConnector):
def __init__(self, downlink_connect_addr, uplink_connect_addr):
ServerDownlinkConnector.__init__(self, downlink_connect_addr)
ServerUplinkConnector.__init__(self, uplink_connect_addr)
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def close(self):
ServerDownlinkConnector.close(self)
ServerUplinkConnector.close(self)