Building servers with Node.js

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Building Servers with Node.js Travis Swicegood #nodetalk Licensed under Creative Commons, Attribution, Share-Alike

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Hi, I’m Travis buildingservers with node.js some rights reserved

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#nodetalk building servers withnode.js some rights reserved

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What’s this talk about? building servers with node.js some rights reserved

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What is Node.js? building servers with node.js some rights reserved

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Servers building servers withnode.js some rights reserved

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GTD building servers withnode.js some rights reserved

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Is it Right For Me? building servers with node.js some rights reserved

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What is Node.js? building servers with node.js some rights reserved

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Evented I/O Networking Toolkit building servers with node.js some rights reserved

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What’s “evented?” building serverswith node.js some rights reserved

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Some Code building serverswith node.js some rights reserved

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Standard Data Store var db = new Database({host: "localhost"}); db.connect(); var result = db.find({name: "a-post"}); // do something with result building servers with node.js some rights reserved

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Evented Data Store var db = new Database({host: "localhost"}); db.connect(function(conn) { conn.find({name: "a-post"}, function(result) { // do something with result }); }); building servers with node.js some rights reserved

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Event Loop building serverswith node.js some rights reserved

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An Analogy building serverswith node.js some rights reserved

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A rabbi, apriest, and a cowboy walk into a bar. building servers with node.js some rights reserved

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Take 1 Simple Bartender building servers with node.js some rights reserved

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Rabbi building servers withnode.js some rights reserved

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Priest building servers withnode.js some rights reserved

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Cowboy… building servers withnode.js some rights reserved

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… he starts to talk building servers with node.js some rights reserved

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Bartender is now blocked building servers with node.js some rights reserved

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Take 2 Evented Bartender building servers with node.js some rights reserved

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Rabbi building servers withnode.js some rights reserved

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Priest building servers withnode.js some rights reserved

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Cowboy… building servers withnode.js some rights reserved

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… he starts to talk building servers with node.js some rights reserved

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Bartender starts filling orders building servers with node.js some rights reserved

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Fixing Take 1 buildingservers with node.js some rights reserved

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Add more bartenders building servers with node.js some rights reserved

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Limit time with each client building servers with node.js some rights reserved

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Respond to Events building servers with node.js some rights reserved

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Who uses this? buildingservers with node.js some rights reserved

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Nginx building servers withnode.js some rights reserved

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Memcached building servers withnode.js some rights reserved

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Most NoSQL building serverswith node.js some rights reserved

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Servers building servers withnode.js some rights reserved

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Basic Socket Server buildingservers with node.js some rights reserved

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Echo Server var net = require("net"); net.createServer(function(socket) { socket.on("data", function(data) { socket.write("You said: " + data); socket.end(); }); socket.write("Please say something:n"); }).listen(1234); console.log("Listening on 1234"); building servers with node.js some rights reserved

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Storing State building serverswith node.js some rights reserved

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Personalized Echo Server net.createServer(function(socket) { var name = false; socket.on("data", function(data) { if (!name) { name = data.toString('utf8').trim(); socket.write("Thanks, " + name + "n"); socket.write("Please say something:n"); } else { socket.write(name + ", you said: " + data); socket.end(); } }); socket.write("Please tell me your name: "); }).listen(1234); building servers with node.js some rights reserved

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Web Servers building serverswith node.js some rights reserved

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Hello World building serverswith node.js some rights reserved

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Hello World var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/html"}); response.write("<h1>Hello, World!</h1>"); response.end(); }).listen(4321); console.log("Now listening on port 4321"); building servers with node.js some rights reserved

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Something’s Different building servers with node.js some rights reserved

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Any idea why? buildingservers with node.js some rights reserved

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Hello World var http = require("http"); http.createServer(function(request, response) { setTimeout(function() { response.writeHead(200, {"Content-Type": "text/html"}); response.write("<h1>Hello, World!</h1>"); response.end(); }, 1000); }).listen(4321); console.log("Now listening on port 4321"); building servers with node.js some rights reserved

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Hello World var http = require("http"); http.createServer(function(request, response) { db.find({"slug": "a-blog-post"}, function(post) { response.writeHead(200, {"Content-Type": "text/html"}); response.write("<h1>" + post.title + "</h1>"); response.write(post.body); response.end(); }); }).listen(4321); console.log("Now listening on port 4321"); building servers with node.js some rights reserved

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Grokking the Request building servers with node.js some rights reserved

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Output the Request buildingservers with node.js some rights reserved

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Output the Request var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.write(require("util").inspect(request)); response.end(); }).listen(4321); console.log("Listening on 4321"); building servers with node.js some rights reserved

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Output the Request var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.write(require("util").inspect(request)); response.end(); }).listen(4321); console.log("Listening on 4321"); building servers with node.js some rights reserved

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Output the Request $ curl -s http://localhost:4321/ { socket: { bufferSize: 0, fd: 7, type: 'tcp4', allowHalfOpen: true, _readWatcher: { socket: [Circular], callback: [Function: onReadable] }, readable: true, _writeQueue: [], _writeQueueEncoding: [], _writeQueueFD: [], … and so on, and so on … building servers with node.js some rights reserved

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Output the Request $ curl -s http://localhost:4321/ … way down around line 148 … url: '/', method: 'GET', building servers with node.js some rights reserved

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Output the Request $ curl -s http://localhost:4321/say?msg=Hello | grep "url:" url: '/say?msg=Hello', building servers with node.js some rights reserved

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Parsing the URL buildingservers with node.js some rights reserved

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Parsing the URL var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); var parsedUrl = require("url").parse(request.url); response.write(require("util").inspect(parsedUrl)); response.end(); }).listen(4321); console.log("Listening on 4321"); building servers with node.js some rights reserved

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Parsing the URL $ curl -s http://localhost:4321/say?msg=Hello { href: '/say?msg=Hello', search: '?msg=Hello', query: 'msg=Hello', pathname: '/say' } building servers with node.js some rights reserved

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Parsing the Query buildingservers with node.js some rights reserved

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Parsing the Query $ curl -s http://localhost:4321/say?msg=Hello { href: '/say?msg=Hello', search: '?msg=Hello', query: 'msg=Hello', pathname: '/say' } building servers with node.js some rights reserved

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Parsing the Query var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); var parsedUrl = require("url").parse(request.url, true); response.write(require("util").inspect(parsedUrl)); response.end(); }).listen(4321); console.log("Listening on 4321"); building servers with node.js some rights reserved

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Parsing the Query var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); var parsedUrl = require("url").parse(request.url, true); response.write(require("util").inspect(parsedUrl)); response.end(); }).listen(4321); console.log("Listening on 4321"); building servers with node.js some rights reserved

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Parsing the Query $ curl -s http://localhost:4321/say?msg=Hello { href: '/say?msg=Hello', search: '?msg=Hello', query: { msg: 'Hello' }, pathname: '/say' } building servers with node.js some rights reserved

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Receiving Data building serverswith node.js some rights reserved

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Receiving Data function(request, response) { var raw = ""; request.on("data", function(chunk) { raw += chunk; }); request.on("end", function() { var data = JSON.parse(raw), obj = {message: data.message.split("").reverse().join("")}; response.writeHead(200, {"Content-Type": "application/json"}); response.write(JSON.stringify(obj)); response.end(); }); } building servers with node.js some rights reserved

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Something is Wrong building servers with node.js some rights reserved

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Can’t handle Errors $ node json-reverse.js Listening on 4321 undefined:0 ^ SyntaxError: Unexpected end of input at Object.parse (native) at IncomingMessage.<anonymous> (/Book/code/servers/json- reverse.js:8:21) at IncomingMessage.emit (events.js:39:17) at HTTPParser.onMessageComplete (http.js:111:23) at Socket.ondata (http.js:945:22) at Socket._onReadable (net.js:654:27) at IOWatcher.onReadable [as callback] (net.js:156:10) building servers with node.js some rights reserved

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Fault-Tolerance building servers withnode.js some rights reserved

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Quick Refactor var handleResponse = function(response, code, message) { response.writeHead(code, {"Content-Type": "application/json"}); response.write(message); response.end(); }; building servers with node.js some rights reserved

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Fault Tolerant Reverse request.on("end", function() { if (!raw) { handleResponse(response, 400, "Requires more data"); return; } try { var data = JSON.parse(raw); } catch(e) { handleResponse(response, 400, "Invalid JSON"); return; } if (!data.message) { handleResponse(response, 400, "Requires a message"); return; } var obj = {message: data.message.split("").reverse().join("") }; handleResponse(response, 200, JSON.stringify(obj)) }); building servers with node.js some rights reserved

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Fault Tolerant Reverse request.on("end", function() { if (!raw) { handleResponse(response, 400, "Requires more data"); return; } try { var data = JSON.parse(raw); } catch(e) { handleResponse(response, 400, "Invalid JSON"); return; } if (!data.message) { handleResponse(response, 400, "Requires a message"); building servers with node.js some rights reserved

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Fault Tolerant Reverse request.on("end", function() { if (!raw) { handleResponse(response, 400, "Requires more data"); return; } try { var data = JSON.parse(raw); } catch(e) { handleResponse(response, 400, "Invalid JSON"); return; } if (!data.message) { handleResponse(response, 400, "Requires a message"); building servers with node.js some rights reserved

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Fault Tolerant Reverse // earlier code } catch(e) { handleResponse(response, 400, "Invalid JSON"); return; } if (!data.message) { handleResponse(response, 400, "Requires a message"); return; } var obj = {message: data.message.split("").reverse().join("") }; handleResponse(response, 200, JSON.stringify(obj)) }); building servers with node.js some rights reserved

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Fault Tolerant Reverse // earlier code } catch(e) { handleResponse(response, 400, "Invalid JSON"); return; } if (!data.message) { handleResponse(response, 400, "Requires a message"); return; } var obj = {message: data.message.split("").reverse().join("") }; handleResponse(response, 200, JSON.stringify(obj)) }); building servers with node.js some rights reserved

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GTD building servers withnode.js some rights reserved

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Libraries Help building serverswith node.js some rights reserved

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Express visionmedia/express building servers with node.js some rights reserved

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Hello World var app = express.createServer(); app.get('/', function(req, res){ res.send('Hello World'); }); app.listen(3000); building servers with node.js some rights reserved

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Socket.IO http://socket.io/ building servers with node.js some rights reserved

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Push from theServer var http = require('http'), io = require('socket.io'); var server = http.createServer(function(req, res){ // your normal server code res.writeHead(200, {'Content-Type': 'text/html'}); res.end('<h1>Hello world</h1>'); }); server.listen(80); // socket.io var socket = io.listen(server); socket.on('connection', function(client){ // new client is here! client.on('message', function(){ … }) client.on('disconnect', function(){ … }) }); building servers with node.js some rights reserved

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Socket.IO // socket.io var socket = io.listen(server); socket.on('connection', function(client){ // new client is here! client.on('message', function(){ … }) client.on('disconnect', function(){ … }) }); building servers with node.js some rights reserved

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Sending to Client // socket.io var socket = io.listen(server); socket.on('connection', function(client) { // send a message back to the client client.send({msg: "Thanks for connecting…"}); // broadcast a message to everyone client.broadcast({msg: "Another one connected!"}); }); building servers with node.js some rights reserved

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CoffeeScript jashkenas/coffee-script building servers with node.js some rights reserved

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Remember this code? request.on("end", function() { if (!raw) { handleResponse(response, 400, "Requires more data"); return; } try { var data = JSON.parse(raw); } catch(e) { handleResponse(response, 400, "Invalid JSON"); return; } if (!data.message) { handleResponse(response, 400, "Requires a message"); return; } var obj = {message: data.message.split("").reverse().join("") }; handleResponse(response, 200, JSON.stringify(obj)) }); building servers with node.js some rights reserved

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In CoffeeScript request.on "end", () -> return handleResponse response, 400, "Requires more data" unless raw try data = JSON.parse raw catch e return handleResponse response, 400, "Requires more data" return handleResponse response, 400, "Requires a message" unless data.message obj = message: data.message.split("").reverse().join("") handleResponse response, 200, JSON.stringify obj building servers with node.js some rights reserved

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Vows cloudhead/vows http://vowjs.org/ building servers with node.js some rights reserved

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No Samples building serverswith node.js some rights reserved

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Is it Right For Me? building servers with node.js some rights reserved

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It Depends building serverswith node.js some rights reserved

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The Checklist building serverswith node.js some rights reserved

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Control the Stack building servers with node.js some rights reserved

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Comfortable with Change building servers with node.js some rights reserved

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Full Control Over App Logic building servers with node.js some rights reserved

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Lots of Small Independent Pieces building servers with node.js some rights reserved

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Then Maybe building serverswith node.js some rights reserved

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Where to? building serverswith node.js some rights reserved

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nodejs.org building servers withnode.js some rights reserved

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#Node.js (freenode) building servers with node.js some rights reserved

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Travis Swicegood travisswicegood.com @tswicegood travis@domain51.com http://joind.in/2810 building servers with node.js some rights reserved

Building servers with Node.js

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