[Buildbot-devel] BuildStep: Calling a function repeatedly until it returns correct value

[Dustin J. Mitchell]

On Tue, Nov 20, 2012 at 7:26 AM, Edward Ekelund <edward.ekelund at axis.com> wrote:
> I feel it shouldn't be that difficult. Does anyone here know of a good
> solution to my problem?

There's no cookbook answer to this.  Assuming that the place where
you're doing this accepts a Deferred, the solution is to return a
Deferred and use reactor.callLater as Pierre has suggested to start
polling.  Once a result is in hand, callback the deferred with that
result.

Another option is to use reactor.deferToThread.  Then you can do all
the blocking stuff you want in the thread.

Dustin