Qth ls

A library for watching Qth registrations in meta/ls/.

This library is intended for 'meta' Qth clients, such as Qth Alias, which need to track the registration of Qth paths over time. Qth ls presents a fairly minimal API. In brief:

• qth_ls.Ls(qth_client, loop): Creates a Qth Ls object.
• ls.watch_path("qth/path/here", callback): Call callback when the path's registration changes, providing the list of registrations for that path or None.
• ls.unwatch_path("qth/path/here", callback): Unregister a callback.

(See the docstrings for details.)

The library takes care of messy details such as subscribing to and checking all subpaths, for example for foo/bar/baz it will check meta/ls/, meta/ls/foo/ and meta/ls/foo/bar/.