Building for clients with Node.js

How clock build websites for their clients in node.js

Transcript

1. Building for clients with Node.js @PabloSerbo Paul Serby
2. Overview About us Why node.js Our approach - code examples Client projects Pain points - code examples Did we make the right decision?
3. @clock www.clock.co.uk
4. Frontend / Design / UX Backend / Devops Clock Team
14. Paul Serby http://github.com/serby @PabloSerbo 10 years at Clock CTO since 2005 Computer Science Degree
15. Why node.js
16. Fatigue
18. Frontend / Design / UX Backend / Devops Clock Team
19. Frontend / Design / UX Backend / Devops PHP Skills
20. Frontend / Design / UX Backend / Devops JavaScript Skills
21. Community
22. Our approach
23. jade hook.io connect express stylus socket.io mongodb mocha should.js winston async underscore jshint
24. Crockford on JavaScript - Act III: Function the Ultimate - http://bit.ly/xooF1h Module Pattern Pseudo-classical inheritance - “This was the inheritance scheme that was designed for the language, and I really don't care for it at all. I don't think it looks very good.”
25. var EventEmitter = require('events').EventEmitter; exports.createKitten = function() { var dead = false , energy = 0 , kitten = new EventEmitter(); function eat() { deadCheck(); energy += 10; } function run() { deadCheck(); if (energy > 1) { energy -= 1; } else { die(); } } function die() { kitten.emit('died', self); deadCheck(); dead = true; } function deadCheck() { if (dead) { throw new Error('You are dead'); } } kitten.eat = eat; kitten.run = run; return self; }; var util = require('util') , events = require('events'); function Kitten() { events.EventEmitter.call(this); } function deadCheck(kitten) { if (kitten.dead) { throw new Error('You are dead'); } } util.inherits(Kitten, events.EventEmitter); Kitten.prototype.energy = 0; Kitten.prototype.dead = 0; Kitten.prototype.eat =function() { deadCheck(this); this.energy += 10; }; Kitten.prototype.run =function() { deadCheck(this); if (this.energy > 1) { this.energy -= 1; } else { this.die(); } }; Kitten.prototype.die = function () { this.emit('died', this); deadCheck(this); this.dead = true; }; exports.Kitten = Kitten;
26. Inversion of Control
27. var serviceLocator = require('service-locator').createServiceLocator() , foo = 'bar'; serviceLocator.register('foobar', foo); console.log(serviceLocator.foobar); // bar serviceLocator.register('logger', console); serviceLocator.logger.log('Hello world'); // Hello world http://github.com/serby/service-locator Inversion of Control
28. Most modules should have exactly 1 export. Module systems should be designed around that use case first, not for dozens of exports. substack Separation of concerns if your module exposes more than one function, you might be doing it wrong :) mikeal
29. OBJECT ORIENTED MASTURBATION Playing with yourself
30. Moduleitus exports.createMathLib = function () { var answer = NaN; return { sum: function (x, y) { answer = x + y; }, get answer() { return answer; } }; }; var math = require('math-lib').createMathLib() , printer = require('printer').createPrinter(); math.sum(1, 1); printer.setPrefix('The answer is: '); printer.out(math.answer); exports.createPrinter = function() { var prefix = ''; return { setPrefix: function(value) { prefix = value; }, out: function(value) { console.log(prefix + value); } }; }; http://robert.accettura.com/blog/2008/12/16/object-oriented-masturbation/ npm install math-lib npm install printer
31. function sum(x, y) { return x + y; } console.log('The answer is: ' + sum(1, 1)); Sanity
32. Client Projects
34. Usage Stats 104,922 Registrations Ran for 1 month Read: 950 per second at peak 150 reg per second at
35. Commercial Stats 40% Profit Sun Perks Phase 1 12 Month Average 32% Profit
37. Usage Stats 154,359 Registrations Ran for 3 months Benchmarked at 250 per second
38. Commercial Stats 31% Profit Sun Perks Phase 2 12 Month Average 32% Profit
40. Commercial Stats 40% Profit Eat Out Phase 1 12 Month Average 32% Profit
41. Commercial Stats 55% Profit Eat Out Phase 2 12 Month Average 32% Profit
42. Commercial Stats 40% Profit Average over both project
43. Pain Points
44. Async
45. Async
46. Sync var userModel = require('../lib/userModelSync').createUserModel(); module.exports.findMe = function(user){ return userModel.findByEmail(user.email) || userModel.findByName(user.name) || userModel.findByGithub(user.github)) || null; };
47. var userModel = require('../lib/userModel').createUserModel(); module.exports.findMe = function(user, callback) { userModel.findByEmail(user.email, function(error, foundUser) { if (error) { return callback(error); } if (foundUser === null) { userModel.findByName(user.name, function(error, foundUser) { if (error) { return callback(error); } if (foundUser === null) { userModel.findByGithub(user.github, function(error, foundUser) { if (error) { callback(error); } if (foundUser === null) { callback(null, null); } else { callback(null, foundUser); } }); } else { callback(null, foundUser); } }); } else { callback(null, foundUser); } }); };
48. var userModel = require('../lib/userModel').createUserModel(); module.exports.findMe = function(user, callback) { userModel.findByEmail(user.email, function(error, foundUser) { if (error) { return callback(error); } if (foundUser === null) { userModel.findByName(user.name, function(error, foundUser) { if (error) { return callback(error); } if (foundUser === null) { userModel.findByGithub(user.github, function(error, foundUser) { if (error) { return callback(error); } if (foundUser === null) { callback(null, null); } else { callback(null, foundUser); } }); } else { callback(null, foundUser); } }); } else { callback(null, foundUser); } }); };
49. var userModel = require('../lib/userModel').createUserModel(), step = require('step'); module.exports.findMe = function(user, callback){ step( function() { userModel.findByName(user.name, this); }, function(error, result) { if (error || result) { this(error, result); } else { userModel.findByEmail(user.email, this); } }, function(error, result) { if (error || result) { this(error, result); } else { userModel.findByGithub(user.github, this); } }, function(error, result) { callback(error, result); } ); }; Step https://github.com/creationix/step
50. var userModel = require('../lib/userModel').createUserModel(), async = require('async'); module.exports.findMe = function(user, callback){ var foundUser, foundError; async.detectSeries( [ async.apply(userModel.findByEmail, user.email), async.apply(userModel.findByName, user.name), async.apply(userModel.findByGithub, user.github) ], function (fn, cb) { fn(function(error, user) { foundUser = user; foundError = error; cb(foundError || user); }); }, function(result) { callback(foundError, foundUser); } ); }; async https://github.com/caolan/async
51. var userModel = require('../lib/userModel').createUserModel(); module.exports.findMe = function(user, callback){ var fns = [ userModel.findByEmail.bind(this, user.email), userModel.findByName.bind(this, user.name), userModel.findByGithub.bind(this, user.github), function() { return callback(undefined, null); } ]; function detect(error, user) { if (error || user) { return callback(error, user); } fns.shift()(detect); } detect(); }; none
52. var userModel = require('../lib/userModel').createUserModel(), chain = require('jangle').chain; module.exports.findMe = function(user, callback){ chain() .seq(userModel.findByName, user.name) .seq(userModel.findByEmail, user.email) .seq(userModel.findByGithub, user.github) .detect(function(error, returnedUser) { return returnedUser; }) .run(callback); }; jangle https://github.com/serby/flow-control-examples
53. NPM Modules http://www.mikealrogers.com/posts/nodemodules-in-git.html
54. NPM Modules http://www.mikealrogers.com/posts/nodemodules-in-git.html GIT
55. Did we make the right decision?
56. Questions?