[Twisted-Python] Issue with stopListening

[Eric Mangold]

On Wed, 04 May 2005 18:23:53 +1000, Örjan Reinholdsen  
<Orjan.Reinholdsen at smarttrust.com> wrote:

> All,
>
> I have written a Twisted server that will be used as a test server to  
> test the client software ability to gracefully handle server shutdown  
> and thereafter reconnect. For that purpose I need my twisted server to  
> periodically stop listening on ports for a while, and then commence  
> normal operation again. For some reason I don't seem to succeede since  
> the twisted server never seems to stop listening on a port even if I  
> call the stopListening method on the IListeningPort object.
>
> Anyone got a clue to what I'm doing wrong?

stopListening() may return a deferred, in which case you'll need to wait  
for it to fire before you can be sure that Twisted has stopped listening.  
Since you have multiple ports a DeferredList may help you here.

Perhaps that is the problem?

-Eric

>
> Regards
> /Örjan
>
> ----
>
> [...]
>
> ports = [8007,8008,8009]
> listenPorts = []
> for port in ports:
>    print "Listening on port %d" % port
>    listenPorts.append(reactor.listenTCP(port, myFactory))
>
> length = len(listenPorts)
> ptime = 10
> dtime = 5
>
> def Down(ticks):
>    print "Stop listening on port %d" % ports[ticks%length]
>    listenPorts[ticks%length].stopListening()
>    reactor.callLater(dtime, Up, ticks)
>
> def Up(ticks):
>    print "Start listening on port %d" % ports[ticks%length]
>    listenPorts[ticks%length].startListening()
>    reactor.callLater(ptime, Down, ticks+1)
>
> reactor.callLater(ptime, Down, 0)
> reactor.run()
>
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