kegan

We see evil cloaking our planet like a black cloud. [...] We see the Jedi surrounded by darkness. [...] The darkness comes from within them and then spreads to engulf them. Perhaps our destruction will come from an explosive device sent to destroy an entire planet without a shiver. [...] We see masked soldiers. We do not know who they are, or what they want. Only that they are evil. They will bring fear and suffering.

-- O-Vieve and V-Tan, in Jedi Apprentice: The Fight for Truth

kegan monitors a changing structured value and tells you how it changes, producing an immutable log of events, modeled as fact assertions and retractions. This lets you tie mutable data to a system that expects immutable data. That immutable data can go into a log manager, or a database like a la Datalog like Datomic and Datascript that lets you query not just the current state, but also the evolution of that state efficiently. It supports arbitrarily nested and structured data automatically by inspecting its structure, with no code to write.

For example, if you want to monitor a JSON REST API (push or pull) and log changes to a log processor or dump them into Datascript to see how it changed, kegan is for you.

kegan is named after Kegan, a planet in the Star Wars universe where citizens' moves are meticulously watched and noted.

License

Copyright © 2015 Rackspace Hosting, Inc.

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.