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20445243
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2013-12-07T18:56:58.510
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2013-12-07T19:45:53.683
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2013-12-07T19:45:53.683
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4279
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4279
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20443535
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2
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<ol> <li>Receive xmlrpc request. Compute request id if you need it to make request to the "binary" server. Do not return from the method</li> <li>Make asynchronous request to the "binary" server (you are client) in the same method. Do not return yet</li> <li>Drop this step (the xmlrpc request is not complete yet, nothing to poll)</li> <li>Return a deferred "real result". You are done. xmlrpc machinery will return real result when it is ready to the xmlrpc client</li> </ol> <p>Here's an example xmlrpc server that returns a deferred subprocess output:</p> <pre><code>#!/usr/bin/env python from timeit import default_timer as timer from twisted.internet import reactor, utils from twisted.web import xmlrpc, server class Example(xmlrpc.XMLRPC): def xmlrpc_echo(self, x): """Sanity check.""" return x def xmlrpc_getoutput(self): shell_command = "echo before sleep; sleep 10; echo after sleep" start = timer() d = utils.getProcessOutput("/bin/sh", ["-c", shell_command]) print("Deferred created in %.2f seconds" % (timer() - start,)) # instant return d reactor.listenTCP(9657, server.Site(Example())) reactor.run() </code></pre> <p>And the corresponding xmlrpc client:</p> <pre><code>#!/usr/bin/env python from timeit import default_timer as timer import xmlrpclib s = xmlrpclib.Server('http://localhost:9657/') def report_delay(func, *args): start = timer() print("Result %r took us %.2f seconds" % (func(*args), timer() - start)) report_delay(s.echo, "Mor-ee-air-teeeee") # should be instant report_delay(s.getoutput) # should be ~10 seconds </code></pre>
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