Hi infra team-

We have a handful of pull requests open on our github repo for which I'd like to ask for help in reviewing:

1) fedbadges 4d PR#22 - Allow lambda expressions in the dat .. http://bit.ly/1aeY7qh 2) tahrir-api 4d PR#19 - Feature/ranking .. http://bit.ly/1dhjI0G 3) fedbadges 3d PR#23 - Publish a fedmsg message when a use .. http://bit.ly/14UUlkP 4) tahrir 3d PR#199 - Feature/publish message on rank cha .. http://bit.ly/14sVXfq 5) fedmsg 2d PR#173 - Feature/idempotent .. http://bit.ly/1643CQX

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Number 1 is an independent change and is an enhancement to the badges awarder that will make it so we can perform much more flexible datanommer queries. (It makes it so we can do flexible operations in python after making the actual datanommer query but before we conclude that a badge should or should not be awarded).

Number 2 is a requirement for numbers 3 and 4. It does a number of things: - it pulls the leaderboard calculation code from tahrir (the web frontend) into tahrir-api (the underlying lib used by both the badges awarder backend and the web frontend) - it caches users' rank in the database which should improve performance on the webapp significantly. - it adds a new `notification_callback` which we'll use to publish fedmsg messages about users' rank changing. We want to award badges based on this kind of stuff, so its a nice bonus.

Number 3 simply makes use of Number 2. It removes the old hardcoded fedmsg stuff from the backend badges awarder.

Number 4 simply makes use of Number 2. It removes the old leaderboard code and the old hardcoded fedmsg stuff from the badges web frontend.

Number 5 is an independent change that will ultimately fix a bug in the datagrepper web api.

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Any help providing review would be much appreciated.

Cheers- -Ralph