This is a quick demonstration of how to implement a D-Bus method in Python using asynchronous callbacks.

I recently added support in system-config-printer for determining the best driver to use for a particular printer.  This is an expensive operation, largely because of the time it takes to get a list of available drivers from CUPS, and the Python program providing the D-Bus service also provides other services.  I wanted the program to be able to deal with other callers while the CUPS operation was in progress.  Here’s how that was done.

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The Avahi support for CUPS has been ported to 1.5.0 now.  I’ve updated the git repository (tracking upstream CUPS, as well as having feature branches for Avahi):
git://fedorapeople.org/home/fedora/twaugh/public_html/cups-avahi.git

Fedora packages for F-16 and rawhide have been built.