I'm hacking on adding VirtualBox support (to allow native Mac development, more than as a serious production target). This means adding another virt provider (I'm trying without libvirt for now, because libvirt VirtualBox support seems a little flaky, and I'm not sure about libvirt on the mac) However one of the methods (get_info) is synchronous on the interface, but the VirtualBox implementation is asynchronous (it gets its results from spawning a process). How do I handle this?
A) Do I change the interface so that the method returns a deferred even in the providers that are synchronous? If so, we should just have all interfaces return a deferred on all methods, so that the interface doesn't expose the implementation. However, this would make everything messy... B) Should I type-check the result of the call and synchronously wait on it if it is deferred? (And can anyone point me at some code that can do a sync-wait?) As an aside, and to borrow from the Wizard of Oz, "Twisted, I've a feeling we're not in Python any more". Every method is preceded by @defer.inlineCallbacks, return x becomes returnValue(x), and there are yields scattered throughout the code based on whether the called method returns a deferred or not. Perhaps we can clarify the Twisted vs Eventlet discussion: would Eventlet solve this particular problem? Justin
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