The Kifi Engineering Blog

Exporting User Data

tl;dr: Export — https://www.kifi.com/keepmykeeps Import instructions — Refind, Chrome, Firefox

Ryan Brewster

Jul 12, 2016

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Léo Grimaldi

Jun 27, 2016

Juggle: Concurrent Task Processing with a Single Actor

TL;DR: https://github.com/kifi/juggle

Concurrent Task Processing

Last year, we open sourced our Reactive Lock, a lightweight library that we use at Kifi to limit…

Carlos Alexander Vializ

May 18, 2016

Don’t let a Content Security Policy slay your extension’s images 🔪

Developing a rich browser extension with on-page content poses many challenges. Some obstacles pit extension developers against website devs. Problems such as CSS rule conflicts, overlapping page elements, and…

Ryan Brewster

May 13, 2016

Functional database request accumulation

This blog post deals with optimizations for large numbers of strictly independent database queries.

Dependent vs Independent Queries

Andrew Conner

May 12, 2016

Route binding custom classes in Play! Framework

One of Play!’s primary features is typed routing, which enables you to use strong types from your controllers. Buried in Play’s documentation (to the best of my knowledge, not linked anywhere) is an example of how to use your own types in routes…

Open-Sourcing our Slack Client for Scala

To celebrate the release of Sign in with Slack, we‘re…

Using Database Dialects within Play Framework

This post follows up on the Scala Slick Database Drivers & Type-Safing Session Concurrency post where we discussed the abstraction layer we’re implementing on top of the slick driver and db access. In the post we mention we’re using DatabaseDialect…

Andrew Conner

Apr 4, 2013

Creating an async consumer Iteratee in Play!

The Play! Iteratee framework is very nice for reactively handling data streams. If you haven’t worked with Iteratees yet, think of them as consumers/sinks with a state. For example, in the Chat room example provided with the Play source…

Andrew Conner

May 12, 2015

Run Play dev mode from the console

Scala’s REPL is incredibly useful during development. For Play apps, especially in version 2.3 and before, much of the API requires a running application (such as WS, database access, etc). They provide a StaticApplication, but this runs in production mode. This could…

Yingjie Miao

Jun 10, 2015

Bayesian Penalty/Boost Function

Scoring functions are widely used in our system, e.g. in search engine and recommendation service. In practice, a scoring function may be paired with a penalty/boost function for additional tweaks. Given an entity E to be scored, the final score is of form f(E)w(E), where…

Stephen Kemmerling

May 19, 2015

Introducing a Reactive Lock for Scala

TL;DR: https://github.com/kifi/ReactiveLock

At Kifi we try to follow reactive patterns as much as possible. Over the last two years we’ve come to appreciate the strengths of the pattern, but also run into some weaknesses. This post and…