Download - Node.js Dublin Meetup April 2014

© Copyright FeedHenry Ltd. 2013

Enterprise Node.js Development

Damian BeresfordTwitter: @dberesford

@feedhenry

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Node.js Dublin April 2014


FeedHenry Platform


Customers

• Customers• Transport• Law Enforcement• Utilities• Aviation• Medical

• ‘Hello world’ Enterprise Proxy Pattern:

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FeedHenry Open Source

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Javascript

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Node.js Anti Patterns

• Java mind set

• OOP

• Monolithic Systems

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Anti Anti Patterns• Data! Functions! Modules!

• Callbacks, async, etc

• Functional Programming

• Underscore• Start with _each, _map, _filter, _reduce

• Unix/KISS mindset

• Microservices

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http://underscorejs.org/

http://shop.oreilly.com/product/0636920028857.do


Futurology

• Promises

• Generators• github.com/visionmedia/co

• Reactive Programming• Reactive Manifesto• RxJS• Bacon.js

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https://github.com/visionmedia/co

https://github.com/visionmedia/co

http://www.reactivemanifesto.org/

https://github.com/Reactive-Extensions/RxJS

http://baconjs.github.io/


Testing Stack

• Turbo – test runner

• Istanbul – code coverage

• Proxyquire – mock your require’s

• Grunt – ties it all together

• See FeedHenry Node.js Cloud Testing Guide

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https://github.com/feedhenry/turbo

https://www.npmjs.org/package/istanbul

https://github.com/thlorenz/proxyquire

http://gruntjs.com/

https://testing.beta.feedhenry.com/docs/guides/testing_cloud.html





Testing Stack - Turbo

• Turbo • Test runner burn out – tight coupling of test running and code coverage• No fluff, no nuff, just executes exported functions in your test files• Per-file and global setUp and tearDown• Parallel by default – encourages stateless tests

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https://github.com/feedhenry/turbo


Testing - Istanbul

• Code coverage with Istanbul

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• Jenkins/CI integration

• Express Middleware – dynamic code coverage

https://www.npmjs.org/package/istanbul

https://github.com/gotwarlost/istanbul-middleware


Testing - Proxyquire

• Proxyquire: “Proxies nodejs require in order to allow overriding of dependencies during testing”

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var request = require('request');

exports.search = function(params, cb) {

request('https://www.google.ie/?q=foo#q=foo', function(err, res, body) {

if (err) return cb(err);

return cb(null, body);

});

};exports.it_should_test_search = function(finish) {

var mockRequest = function(url, cb) {

console.log("in mock call to request!");

return cb(null, {}, 'Sample data!!');

};

var main = proxyquire('lib/foo.js', {request: mockRequest});

main.search(null, function(err, data) {

assert.ok(!err, 'Unexpected error: ' + util.inspect(err));

console.log("got data from search: ", data);

finish();

});

};

https://github.com/thlorenz/proxyquire


Testing – unit vs acceptance

• Eyes on code!

• unit tests should require no external dependencies, external services should be mocked out (e.g. internet access, writing to file/database, etc)

• unit tests should be super quick to run

• unit tests should be reliable as no external dependencies

• unit tests should just test your own logic

• acceptance tests can require external dependencies, which do require setup (which should be well documented!)

• as such they can take longer to run

• acceptance tests are a more 'end to end' philosophy

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Micro Services

• martinfowler.com/articles/microservices.html

• yobriefca.se/blog/2013/04/29/micro-service-architecture

• slideshare.net/michaelneale/microservices-and-functional-programming

• klangism.tumblr.com/post/80087171446/microservices

• richardrodger.com/monolithic-nodejs

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http://martinfowler.com/articles/microservices.html



http://yobriefca.se/blog/2013/04/29/micro-service-architecture/



http://www.slideshare.net/michaelneale/microservices-and-functional-programming



http://klangism.tumblr.com/post/80087171446/microservices



http://www.richardrodger.com/monolithic-nodejs




Mirco Services

• Mix of Message Bus and API

• API - JSON in JSON out (robustness principal)

• Message Bus – Rabbit MQ

• Not just node.js, DropWizard for Java

• Continuous Integration - Small Production Deploys

• Operations – monitor all the things

• Dedicated Ops and Support teams

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https://dropwizard.github.io/dropwizard/


Mirco Services – complexity

• Not a silver bullet – but does help with complexity• Still deal with lots of business rules, moving parts, etc• Easy !== Simple• Work at simplicity

• Need Master Builders to keep all the balls in the air

• Boxology

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Misc

• Private NPM Registry: npm delegate (may move to Kappa)

• Docker – container awesomeness

• API Blueprint – readme on steroids

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https://github.com/jden/npm-delegate

https://github.com/jden/npm-delegate

https://github.com/krakenjs/kappa

https://www.docker.io/

http://apiblueprint.org/


API Blueprint

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API Blueprint

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Thank you..

• Tanx!

• www.feedhenry.com/ for more…

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http://www.feedhenry.com/

Download - Node.js Dublin Meetup April 2014

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