[Libguestfs] running libguestfs as a service?

Hello, First off, many thanks for libguestfs... very useful! I'm trying to run libguestfs as an RPC service by using a python daemon with the python libguestfs bindings. With this service I'm "centrally" editing VM images, and often running many GuestFS() on the same image file in a short amount of time to edit the image's contents. The problem I'm running across is that each GuestFS() instance called from within the python daemon doesn't terminate itself (until a timeout much later?). I believe this sometimes causes my image edits to clobber each other and corrupt the image now and then. Each image edit usually amounts to: g = guestfs.GuestFS() g.add_drive(image_file) g.launch() g.mount("/dev/vda1", "/") g.write(file_name, file_contents) g.sync() g.umount_all() g.close() del g As I understand things, there is a reference count that should close "g" once the reference count = 0. However, I can't seem to make that happen inside of my python daemon which continues to run. Any clues on how I might accomplish this or what I'm doing wrong? Thanks