[Buildbot-devel] Is extending getChoices method of ForceSched/ChoiceStringParameter to support returning deferreds a good idea?

[Jared Grubb]

What kind of external data would you like to use? Is it something relatively static (values stable and can be cached, but may change at certain events [slave connect, build complete, etc]) or truly dynamic (values in constant flux and must queried fresh every time)?

One application I really want to use here is the ability to collect configuration info about buildslaves and allow a build to run on a slave that has that ability. For example, you could imagine that you have a "OS X 10.8" builder, but each slave might be any of {10.8.0, 10.8.1, 10.8.2, ...} and there are times when you really care which one you use ... but setting up a completely separate builder for those situations is overkill.

So rather than just "pick a slave", I want to be able to "pick a slave that can/has ___" and have a dropdown box autogenerate the "can" values as the union of what all the slaves currently can do, and dispatch to a good one.

Jared

On 7 Mar 2013, at 14:30, Greg Wolgemuth <gwolgemuth at magmic.com> wrote:

> I just saw Jared Grubb's work in (https://github.com/buildbot/buildbot/pull/641) and was immediately interested. I have several use cases for dynamically populating lists on the Force Build screen.
> 
> Several of my use cases involve generating these lists from data external to BuildBot. My first thought was to alter the call chain to getChoices to support getChoices returning a possible deferred. But I'm worried about the context of buildForceContext in status/web/builder.py. Does this only trigger when the user loads up the builder page itself? Would invocations of getChoices/buildForceContext need to be parallel, to prevent page latency from getting too high (especially when viewing the "all builders" page)? I don't want unnecessary, expensive calls to external systems slowing down BuildBot too much.
> 
> I'd be happy to write up a pull request for this if it sounds like a good idea.
> 
> -
> 
> Gregory Wolgemuth
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