Reflect impersonation state in nova action log

Hi, I'm looking for a way to make the action log in nova mention if the user performing the action was being impersonated. Right now if an admin impersonating some user performs an action, the user being impersonated gets logged as having performed the action which is not desirable. I thought about registering a custom user resolver for nova to use but that seems like a roundabout way of doing it, and I couldn't get that working anyway... Any advice is much appreciated!