Learning about Node.JS and how to integrate it with CakePHP for unmatched performance

9. Libuv == Node.exe http_simple (/bytes/1024) over 1-gbit network, with 700 concurrent connections: windows-0.5.4 : 3869 r/s windows-latest : 4990 r/s linux-latest-legacy : 5215 r/s linux-latest-uv : 4970 r/s

12. First node.js server var http = require ( 'http' ); http. createServer ( function (req, res) { res. writeHead ( 200 , { 'Content-type' : 'text/plain' }); res. end ( 'Hello world!' ); }). listen ( 1337 ); console. log ( 'Server running at http://localhost:1337' );

15. Packaged modules $ curl http://npmjs.org/install.sh | sh $ npm install db-mysql There are more than 3350 packages, and more than 14 are added each day

16. Packaged modules var m = require ( './module' ); m. sum ( 1 , 3 , function (err, res) { if (err) { return console. log ( 'ERROR: ' + err); } console. log ( 'RESULT IS: ' + res); }); exports.sum = function (a, b, callback) { if ( isNaN (a) || isNaN (b)) { return callback ( new Error ( 'Invalid parameter' )); } callback ( null , a+b); };

18. Multiple environments var express = require ( 'express' ); var app = express. createServer (); app. get ( '/' , function (req, res) { res. send ( 'Hello world!' ); }); app. listen ( 3000 ); console. log ( 'Server listening in http://localhost:3000' ); app. configure ( function () { app. use (express. bodyParser ()); }); app. configure ( 'dev' , function () { app. use (express. logger ()); }); $ NODE_ENV=dev node app.js

19. Middleware function getUser (req, res, next) { if (!req.params.id) { return next (); } else if (!users[req.params.id]) { return next ( new Error ( 'Invalid user' )); } req.user = users[req.params.id]; next (); } app. get ( '/users/:id?' , getUser, function (req, res, next) { if (!req.user) { return next (); } res. send (req.user); });

22. node-db var mysql = require ( 'db-mysql' ); new mysql. Database ({ hostname: 'localhost' , user: 'root' , password: 'password' , database: 'db' }). connect ( function (err) { if (err) { return console. log ( 'CONNECT error: ' , err); } this . query (). select ([ 'id' , 'email' ]). from ( 'users' ). where ( 'approved = ? AND role IN ?' , [ true , [ 'user' , 'admin' ] ]). execute ( function (err, rows, cols) { if (err) { return console. log ( 'QUERY error: ' , err); } console. log (rows, cols); }); });

23. Let's get to work

26. Sample application CREATE TABLE `users`( `id` char(36) NOT NULL, `email` varchar(255) NOT NULL, `password` text NOT NULL, `name` varchar(255) NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY `email` (`email`) ); CREATE TABLE `messages` ( `id` char(36) NOT NULL, `from_user_id` char(36) NOT NULL, `to_user_id` char(36) NOT NULL, `message` text NOT NULL, `created` datetime NOT NULL, PRIMARY KEY (`id`), KEY `from_user_id` (`from_user_id`), KEY `to_user_id` (`to_user_id`), CONSTRAINT `messages_from_user` FOREIGN KEY (`from_user_id`) REFERENCES `users` (`id`), CONSTRAINT `messages_to_user` FOREIGN KEY (`to_user_id`) REFERENCES `users` (`id`) );

28. CakePHP code class MessagesController extends AppController { public function incoming ( $userId ) { $since = ! empty ( $this ->request->query[ 'since' ]) ? urldecode ( $this ->request->query[ 'since' ]) : null; if ( empty ( $since ) || ! preg_match ( '/^{4}-{2}-{2} {2}:{2}:{2}$/' , $since ) ) { $since = '0000-00-00 00:00:00' ; } $messages = ... $this ->autoRender = false; $this ->response-> type ( 'json' ); $this ->response-> body ( json_encode ( $messages )); $this ->response-> send (); $this -> _stop (); } }

29. CakePHP code $messages = $this ->Message-> find ( 'all' , array ( 'fields' => array ( 'Message.id' , 'Message.message' , 'FromUser.id' , 'FromUser.name' , 'ToUser.name' ), 'joins' => array ( array ( 'type' => 'INNER' , 'table' => 'users' , 'alias' => 'FromUser' , 'conditions' => array ( 'FromUser.id = Message.from_user_id' ) ), array ( 'type' => 'INNER' , 'table' => 'users' , 'alias' => 'ToUser' , 'conditions' => array ( 'ToUser.id = Message.to_user_id' ) ), ), 'conditions' => array ( 'Message.to_user_id' => $userId , 'Message.created >=' => $since ), 'order' => array ( 'Message.created' => 'asc' ), 'recursive' => - 1 ));

30. Node.js code: express var express = require ( 'express' ), mysql = require ( 'db-mysql' ), port = 1337 ; var app = express. createServer (); app. get ( '/messages/incoming/:id' , function (req, res){ var r = ... var userId = req.params.id; if (!userId) { return r ( new Error ( 'No user ID provided' )); } var since = req.query.since ? req.query.since : false ; if (!since || !/^{ 4 }-{ 2 }-{ 2 } { 2 }:{ 2 }:{ 2 }$/. test (since)) { since = '0000-00-00 00:00:00' ; } new mysql. Database (...). connect ( function (err) { if (err) { return r (err); } ... }); }); app. listen (port); console. log ( 'Server running at http://localhost:' + port);

32. Node.js code: node-db db. query (). select ({ 'Message_id' : 'Message.id' , 'Message_message' : 'Message.message' , 'FromUser_id' : 'FromUser.id' , 'FromUser_name' : 'FromUser.name' , 'ToUser_name' : 'ToUser.name' }). from ({ 'Message' : 'messages' }). join ({ type: 'INNER' , table: 'users' , alias: 'FromUser' , conditions: 'FromUser.id = Message.from_user_id' }). join ({ type: 'INNER' , table: 'users' , alias: 'ToUser' , conditions: 'ToUser.id = Message.to_user_id' }). where ( 'Message.to_user_id = ?' , [ userId ]). and ( 'Message.created >= ?' , [ since ]). order ({ 'Message.created' : 'asc' }). execute ( function (err, rows) { ... });

33. Node.js code: node-db function (err, rows) { db. disconnect (); if (err) { return r (err); } for ( var i= 0 , limiti=rows.length; i < limiti; i++) { var row = {}; for ( var key in rows [i] ) { var p = key. indexOf ( '_' ), model = key. substring ( 0 , p), field = key. substring (p+ 1 ); if (!row [model] ) { row [model] = {}; } row [model][field] = rows [i][key] ; } rows [i] = row; } r ( null , rows); }

35. Bonus tracks

36. #1 Pooling connections

38. #2 Clustering express

40. Clustering express

41. #3 Dealing with parallel tasks

43. Dealing with parallel tasks var async = require ( 'async' ); async. waterfall ([ function (callback) { callback ( null , 4 ); }, function (id, callback) { callback ( null , { id: id, name: 'Jane Doe' }); }, function (user, callback) { console. log ( 'USER: ' , user); callback ( null ); } ]); $ node app.js USER: { id: 4, name: 'Jane Doe' }

44. #4 Unit testing

46. Unit testing var nodeunit = require (' nodeunit' ); exports[ 'group1' ] = nodeunit. testCase ({ setUp: function (cb) { cb (); }, tearDown: function (cb) { cb (); }, test1: function (test) { test. equals ( 1 + 1 , 2 ); test. done (); }, test2: function (test) { test. expect ( 1 ); ( function () { test. equals ( 'a' , 'a' ); })(); test. done (); } }); $ nodeunit tests.js nodeunit.js ✔ group1 – test1 ✔ group1 – test2

47. Questions?