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ZeroMQ bindings for Twisted
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Twisted bindings for ZeroMQ =========================== txZMQ allows to integrate easily `ZeroMQ <http://zeromq.org>`_ sockets into Twisted event loop (reactor). Requirements: * ZeroMQ library >= 2.1 (heavily tested with 2.1.4) Python packages required: * pyzmq * Twisted txZMQ introduces support for general ZeroMQ sockets by class ``ZmqConnection`` that can do basic event loop integration, sending-receiving messages in non-blocking manner, scatter-gather for multipart messages. Special descendants of that class, ``ZmqPubConnection`` and ``ZmqSubConnection`` add special nice features for PUB/SUB sockets. Other socket types could be easily derived from ``ZmqConnection`` except for REQ/REP sockets that may require more work, as reply should be send immediately upon receiving message (currently ``ZmqConnection`` will try to read all available message and write queued messages in parallel). Example:: import sys from optparse import OptionParser from twisted.internet import reactor, defer from twisted.python import log observer = log.FileLogObserver(sys.stderr) log.addObserver(observer.emit) parser = OptionParser("") parser.add_option("-m", "--method", dest="method", help="0MQ socket connection: bind|connect") parser.add_option("-e", "--endpoint", dest="endpoint", help="0MQ Endpoint") parser.add_option("-M", "--mode", dest="mode", help="Mode: publisher|subscriber") parser.set_defaults(method="connect", endpoint="epgm://eth1;239.0.5.3:10011") (options, args) = parser.parse_args() from txZMQ import ZmqFactory, ZmqEndpoint, ZmqPubConnection, ZmqSubConnection import time zf = ZmqFactory() e = ZmqEndpoint(options.method, options.endpoint) if options.mode == "publisher": s = ZmqPubConnection(zf, e) def publish(): data = str(time.time()) print "publishing %r" % data s.publish(data) reactor.callLater(1, publish) publish() else: s = ZmqSubConnection(zf, e) s.subscribe("") def doPrint(*args): print "message received: %r" % (args, ) s.gotMessage = doPrint reactor.run()
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