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107 lines
3.1 KiB
Python
107 lines
3.1 KiB
Python
"""Classes for running a steerable ZMQ proxy"""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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import zmq
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from zmq.devices.proxydevice import ProcessProxy, Proxy, ThreadProxy
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class ProxySteerableBase:
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"""Base class for overriding methods."""
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def __init__(self, in_type, out_type, mon_type=zmq.PUB, ctrl_type=None):
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super().__init__(in_type=in_type, out_type=out_type, mon_type=mon_type)
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self.ctrl_type = ctrl_type
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self._ctrl_binds = []
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self._ctrl_connects = []
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self._ctrl_sockopts = []
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def bind_ctrl(self, addr):
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"""Enqueue ZMQ address for binding on ctrl_socket.
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See zmq.Socket.bind for details.
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"""
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self._ctrl_binds.append(addr)
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def bind_ctrl_to_random_port(self, addr, *args, **kwargs):
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"""Enqueue a random port on the given interface for binding on
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ctrl_socket.
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See zmq.Socket.bind_to_random_port for details.
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"""
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port = self._reserve_random_port(addr, *args, **kwargs)
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self.bind_ctrl(f'{addr}:{port}')
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return port
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def connect_ctrl(self, addr):
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"""Enqueue ZMQ address for connecting on ctrl_socket.
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See zmq.Socket.connect for details.
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"""
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self._ctrl_connects.append(addr)
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def setsockopt_ctrl(self, opt, value):
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"""Enqueue setsockopt(opt, value) for ctrl_socket
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See zmq.Socket.setsockopt for details.
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"""
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self._ctrl_sockopts.append((opt, value))
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def _setup_sockets(self):
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ins, outs, mons = super()._setup_sockets()
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ctx = self._context
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ctrls = ctx.socket(self.ctrl_type)
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self._sockets.append(ctrls)
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for opt, value in self._ctrl_sockopts:
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ctrls.setsockopt(opt, value)
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for iface in self._ctrl_binds:
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ctrls.bind(iface)
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for iface in self._ctrl_connects:
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ctrls.connect(iface)
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return ins, outs, mons, ctrls
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def run_device(self):
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ins, outs, mons, ctrls = self._setup_sockets()
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zmq.proxy_steerable(ins, outs, mons, ctrls)
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class ProxySteerable(ProxySteerableBase, Proxy):
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"""Class for running a steerable proxy in the background.
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See zmq.devices.Proxy for most of the spec. If the control socket is not
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NULL, the proxy supports control flow, provided by the socket.
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If PAUSE is received on this socket, the proxy suspends its activities. If
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RESUME is received, it goes on. If TERMINATE is received, it terminates
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smoothly. If the control socket is NULL, the proxy behave exactly as if
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zmq.devices.Proxy had been used.
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This subclass adds a <method>_ctrl version of each <method>_{in|out}
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method, for configuring the control socket.
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.. versionadded:: libzmq-4.1
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.. versionadded:: 18.0
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"""
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class ThreadProxySteerable(ProxySteerableBase, ThreadProxy):
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"""ProxySteerable in a Thread. See ProxySteerable for details."""
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class ProcessProxySteerable(ProxySteerableBase, ProcessProxy):
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"""ProxySteerable in a Process. See ProxySteerable for details."""
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__all__ = [
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'ProxySteerable',
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'ThreadProxySteerable',
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'ProcessProxySteerable',
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]
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