Ardoq.com @ebaxt

Erik Bakstad

Clojure at

Ardoq

Oslo Socially Functional Programmers

Ardoq.com @ebaxt

! 6 years as consultant (finance/telecom)

! Mostly Java & JavaScript professionally

! Discovered Clojure in 2009

! Groovy, Ruby, Python, SML, Racket, Scala …

! CTO & Co-founder of Ardoq

My background

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AGENDA

! What is Ardoq?

! Why we decided to use Clojure

! Overview Clojure at Ardoq + 2 Cases

! REPL/development environment

! Experience so far / Q&A / Discussions

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What is Ardoq?

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We‘re building larger, more complex systems

! Many different “sub-systems“

! Different technologies

! Wide range of integrations

! System-of-systems problem

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To achieve conceptual understanding we create artifacts

! Documents

! System maps

! Diagrams

! Flowcharts

These artifacts are hard to maintain!

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Existing tools are either ...

Enterprise architecture software

Very Complex

Word

Not powerfull enough

Excel PowerPoint

Wikis

V isio

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Ardoq is a documentation platform that offers

! Explorable, “Living” documentation

! Automatically visualizes dependencies and hierarchies

! REST-api for data import/export

! Supports custom visualizations via plugins

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DEMO

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Why Clojure?

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Ardoq.com @ebaxt

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Ship software

Quickly Fun!

C onsistently (over time)

Quality

Try out different solutions

Understand How it works!

Leverage

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JavaScript

MongoDB

Clojure

BSON

JSON

{ "firstname": "Erik", "lastname": "Bakstad", "age": 30, "hobby": ["hockey", "cycling"] }

{ "firstname": "Erik", "lastname": "Bakstad", "age": 30, "hobby": ["hockey", "cycling"] }

{ :firstname "Erik" :lastname "Bakstad" :age 30 :hobby ["hockey", "cycling"] }

EDN

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! Extensive REST-api

! “Version control” on top of MongoDB

! Real-time web backend

! 3-party integrations (recurly, jira, segment.io, +++)

! Attachment service with pluggable storage provider

Stuff we‘ve built in Clojure

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Architecture

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Backbone.js !D3.js!jQuery!Require.js! JavaScript-app!

Clojure!backend!

MongoDB!! Redis!

H T TP Websockets SNS!S3!

Segment.io!Mailchimp!Mandrill!Recurly!JIRA!Tarsnap!!

H T TP

TCP

Plugins!JavaDoc / Excel! H T TP

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api!

com.ardoq.*

utils! service!

gateway!persistence!

MongoDB!!

SNS!S3!

Segment.io!Mailchimp!Mandrill!Recurly!JIRA!!!

hAp://www.infoq.com/presentaGons/DDDIClojure$

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Libraries

! Carmine

! amazonica

! core.async

! Pantomime

! clj-http/chime/clostach

! Ring/compojure/Liberator

! http-kit/clj-wamp

! Friend/oauthentic/clj-oauth

! clj-schema/antisamy

! Monger/ragtime

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Testing/debugging

! Started out with midje

! Now using clojure.test

! ring.mock

! Lein test selectors

! Mongodb + redis

! clojure.tools.trace

! IntelliJ with Cursive

! Embedded REPL

! criterium

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Editor/IDE

! Emacs + Cider

! clojure-mode + paredit

! clojure-test-mode

! clojure-refactor (just started)

! company-cider

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Infrastructure/monitoring

! S3 (wagon)

! SNS

! Zapier

! Tarsnap

! HipChat

! AWS / on-site

! Ansible /python/bash

! Circle-CI

! Logstash + Kibana

! Pingdom

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Case 1

REST-api

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Request Response

Servlet C ontainer Servlet AP I

Ring

Application

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{:scheme(:http,((:session({}((:request3method(:get,((:query3string("q=hello"((:cookies({}((:uri("/test"((:headers(({"accept3encoding"("gzip,(deflate"}((:body(...}$

(defn%handler([request](...()$

{:status(200((:headers({"Content3Type"((((((((((((("text/plain"}((:body("Hello(World!"}$

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(defn%middleware([handler]((((()$

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(defn%middleware([handler]((((fn%[req](((...((((handler(req)(((...())$

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(defroutes(api((((GET("/"([](...)((((POST("/"([](...))(((def%handler(((((logging((session((security(app))))((((run3jetty(handler({:port(8080}))$

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(defroutes(api((((GET("/"([](...))(

?

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Ardoq.com @ebaxt

Liberator

hAp://clojureIliberator.github.io/liberator/$

(defroutes(api((((GET("/"([](...))(

Decision graph

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Decision graph

hAp://clojureIliberator.github.io/liberator/assets/img/decisionIgraph.svg$

(resource((((((((((:allowed3methods([:get]((((((((((:allowed?((fn%[_]((permission/is3admin?))((((((((((:available3media3types(["application/json"]((((((((((:exists?((fn%[_]({::result(...)((((((((((:handle3ok(::result)))$

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Authentication

hAps://github.com/cemerick/friend$

! Basic Auth

! Token Auth

! Oauth (Log in with Github, Google, Live Connect)

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Friend

hAps://github.com/cemerick/friend$

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Friend

hAps://github.com/cemerick/friend$

{:workflows([(ajax3login)(((((((((((((((token3workflow(:realm("Ardoq"(:credential3fn(...)(((((((((((((((workflows/http3basic(:realm("Ardoq")(((((((((((((((github3oauth(system)(((((((((((((((live3connect3oauth(system)(((((((((((((((google3oauth(system)]((:credential3fn((partial(verify3credentials(system)((:login3uri("/login"((:unauthorized3redirect3uri("/login"((:default3landing3uri("/index.html"}$

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Middleware

! wrap-impersonate

! wrap-organization

! wrap-session-expiry

! clojure-metrics

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Case 2

Real-time web

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API-1! API-2!

Nginx-1! Nginx-2!

Browser-1! Browser-2!POST$/api/component${“name”:$“foo”}$

NoGfy$user$of$BrowserI1’s$POST$

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Why not use something like Pusher.app or firebase?

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The Web Application Messaging Protocol

hAp://wamp.ws/$

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API-1! API-2!

Nginx-1! Nginx-2!

Browser-1! Browser-2!

Websocket + Wamp

Http-kit + cl j-wamp

Autobahn.js + f lash-fal l back

?

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API-1! API-2!

Nginx-1! Nginx-2!

Browser-1! Browser-2!

Redis PubSub + core.async Redis!

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Publish!Event! Redis!

Carmine!listener!

Core.async!mult-channel!

(loop! …! (wamp/send-event …)! (recur))!!

Browser-2!Browser-1!

Workspace-event Organization- event

dao!

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Publish!Event! Redis!

Carmine!listener!

Core.async!mult-channel!

(loop! …! (wamp/send-event …)! (recur))!!

Analytics!

Testing!

dao!

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REPL

Driven Development

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http://thinkrelevance.com/blog/2013/06/04/clojure-workflow-reloaded

https://github.com/juxt/jig

https://github.com/stuartsierra/component

https://www.youtube.com/watch?v=13cmHf_kt-Q

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The Clojure experience

So far

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Ardoq.com @ebaxt

Other benefits

Tiny codebase Fast feedback Libraries (both Java and Clojure) Concurrency

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Challenges

Dynamic language - tradeoffs Lack of signatures LISP – with great power comes…

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Thank you!

Questions?

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THANK YOU!