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  <div class="vevent h-event"> <h1 class="summary p-name">Kevin Lynagh: Walkthrough of a Clojure+Clojurescri­pt+Datomic Image Diffing Application</h1> <div class='date'><time class="dtstart dt-start" title="2014-02-20T17:30:00" datetime="2014-02-20T17:30:00">Thursday, February 20, 2014 from 5:30</time>–<time class="dtend dt-end" title="2014-02-20T19:00:00" datetime="2014-02-20T19:00:00">7pm</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202393539'><span class='fn org p-name'>Puppet</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">308 SW 2nd Ave Fifth Floor</div> <span class="locality p-locality">Portland</span> , <span class="region p-region">OR</span> <span class="postal-code p-postal-code">97204</span> <div class="country-name p-country-name">US</div> (<a href='https://maps.google.com/maps?q=308%20SW%202nd%20Ave%20Fifth%20Floor,%20Portland%20OR%2097204%20US'>map</a>) </div> </div> <div class="description p-description"> <p>Kevin sez:</p> <p>The domain problem is conceptually simple: you provide sets of images and are notified with visual diffs of changes. The motivating use case was regression testing a web data visualization product---taking screenshots is far easier and more comprehensive than unit testing JavaScript + DOM + CSS styling.</p> <p>The application is about 1300 lines of code, which includes all of the (Clojure-generated) markup and styling.It's built with Clojure, ClojureScript, and Datomic. I'll touch on:</p> <ul> <li><p>designing an application around Stuart Sierra's "Reloaded" workflow: <a href="http://thinkrelevance.com/blog/2013/06/04/clojure-workflow-reloaded">http://thinkrelevance.com/blog/2013/06/04/clojure-workflow-reloaded</a></p></li> <li><p>basics (and not-so-basics) of the Ring HTTP model</p></li> <li><p>using Chas Emerick's Friend library to handle web user and API authentication</p></li> <li><p>deploying/monitoring a Clojure application in (low-stakes) production</p></li> <li><p>structuring an application around protocols so that service backends (e.g., S3) can be easily swapped between development, staging, and production</p></li> </ul> <p>If there's anything that seems particularly interesting to you (in the above list or otherwise), please reply to this thread so I can prepare a bit of material.</p> <p>I'm planning on giving a 20 minute high-level overview of the application, and then opening it up to questions and focussing on whatever topics folks are interested in.</p> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="http://www.meetup.com/clojerks/events/161111042/">Website</a></li> </ul> </div>