Something like asynchronous XML-RPC possible?
"Martin v. Löwis"
martin at v.loewis.de
Fri Jan 24 12:40:22 CET 2003
Will Stuyvesant wrote:
> Under the hood the processes communicate by means of TCP. But now my
> boss wants them to communicate by means of UDP! Any ideas how to
> accomplish this? It would mean that operation or method calls are no
> longer possible, only communication via events will be there.
Not necessarily: you can implement synchronous communication on top of
UDP as well (just as you can implement asynchronous methods on top of TCP).
> The desired usage pattern would be::
> p2 = remote_async_process(url, portnumber)
Traditionally, the usage pattern would be different:
p2 = remote_async_process(url, portnumber)
request = p2.method(params)
while not request.done():
result = request.result()
(of course, the request object can be discarded if no result is expected)
BTW, the same usage pattern is possible over TCP, as well, even without
cooperation from the server.
> If you know a solution please let me know. Especially if the solution
> only uses standard Python libraries. I think it could be done using
> just xmlrpclib and SimpleHTTPServer with a UDP request handler or
> something, but its usage patterns are confusing me and if you have
> done this already please let me know!
But you have already outlined a solution! This is certainly all possible
in plain Python, using existing libraries. What part is confusing to
you? Just try to implement this step-by-step, starting with how you
would implement your sendEvent function (traditionally, the client side
is easier to implement than the server side).
However, I would question that using XML-RPC on top of http is useful,
since you are inventing a proprietary protocol, anyway: You could just
as well send plain strings, or pickles.
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