mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-11-15 04:47:16 +00:00
75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
import logging
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import zmq
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from zmq.eventloop.zmqstream import ZMQStream
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from .scope import Scope
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from .serialization import (
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serialize_tfw_msg,
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deserialize_tfw_msg,
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with_deserialize_tfw_msg
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)
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LOG = logging.getLogger(__name__)
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class ZMQDownlinkConnector:
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def __init__(self, connect_addr):
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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)
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self._zmq_sub_stream = ZMQStream(self._zmq_sub_socket)
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def subscribe(self, *keys):
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for key in keys:
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self._zmq_sub_socket.setsockopt_string(zmq.SUBSCRIBE, key)
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def unsubscribe(self, *keys):
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for key in keys:
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self._zmq_sub_socket.setsockopt_string(zmq.UNSUBSCRIBE, key)
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def register_callback(self, callback):
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callback = with_deserialize_tfw_msg(callback) if callback else None
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self._zmq_sub_stream.on_recv(callback)
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def recv_message(self, *, block=True):
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if self._zmq_sub_stream.receiving():
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raise RuntimeError('Synchronous recv() called while a callback is registered!')
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flags = 0 if block else zmq.NOBLOCK
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try:
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return deserialize_tfw_msg(*self._zmq_sub_socket.recv_multipart(flags))
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except zmq.ZMQError:
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raise IOError("No data available to recv!")
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def close(self):
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self._zmq_sub_stream.close()
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class ZMQUplinkConnector:
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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=None, intent=None):
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if 'scope' not in message:
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message['scope'] = Scope.ZMQ.value
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if scope is not None:
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message['scope'] = scope.value
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if intent is not None:
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message['intent'] = intent.value
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self._zmq_push_socket.send_multipart(serialize_tfw_msg(message))
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def close(self):
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self._zmq_push_socket.close()
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class ZMQConnector(ZMQDownlinkConnector, ZMQUplinkConnector):
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def __init__(self, downlink_connect_addr, uplink_connect_addr):
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ZMQDownlinkConnector.__init__(self, downlink_connect_addr)
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ZMQUplinkConnector.__init__(self, uplink_connect_addr)
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def close(self):
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ZMQDownlinkConnector.close(self)
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ZMQUplinkConnector.close(self)
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