Building Servers with Node.js(用NodeJS写服务器程序) by Travis Swicegood

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Building Servers with Node.js(用NodeJS写服务器程序) by Travis Swicegood

发布者 nodejser

发布于 1448327271191 浏览 5943 关键词 Node.JS, English

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第1页

Building Servers with Node.js

Travis Swicegood

#nodetalk

Licensed under Creative Commons, Attribution, Share-Alike

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Hi, I’m Travis

building servers with node.js

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#nodetalk

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What’s this talk about?

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What is Node.js?

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Servers

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GTD

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Is it Right For Me?

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What is Node.js?

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Evented I/O Networking

Toolkit

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What’s “evented?”

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Some Code

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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

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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

}); });

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Event Loop

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An Analogy

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A rabbi, a priest, and a cowboy walk

into a bar.

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Take 1 Simple Bartender

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Rabbi

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Priest

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Cowboy…

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… he starts to talk

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Bartender is now blocked

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Take 2 Evented Bartender

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Rabbi

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Priest

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Cowboy…

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… he starts to talk

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Bartender starts filling orders

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Fixing Take 1

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Add more bartenders

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Limit time with each client

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第33页

Respond to Events

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Who uses this?

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Nginx

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Memcached

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Most NoSQL

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Servers

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Basic Socket Server

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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");

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Storing State

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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);

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Web Servers

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Hello World

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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");

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Something’s Different

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Any idea why?

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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");

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第71页

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");

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Grokking the Request

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Output the Request

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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");

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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 …

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Output the Request

$ curl -s http://localhost:4321/ … way down around line 148 …

url: '/', method: 'GET',

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Output the Request

$ curl -s http://localhost:4321/say?msg=Hello | grep "url:" url: '/say?msg=Hello',

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Parsing the URL

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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");

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第81页

Parsing the URL

$ curl -s http://localhost:4321/say?msg=Hello { href: '/say?msg=Hello',

search: '?msg=Hello', query: 'msg=Hello', pathname: '/say' }

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Parsing the Query

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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' }

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第88页

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");

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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' }

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第91页

Receiving Data

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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(); });

}

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Something is Wrong

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第103页

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/jsonreverse.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)

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第104页

Fault-Tolerance

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第105页

Quick Refactor

var handleResponse = function(response, code, message) { response.writeHead(code, {"Content-Type": "application/json"}); response.write(message); response.end();

};

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第106页

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)) });

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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");

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第108页

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");

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第109页

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)) });

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GTD

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Libraries Help

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Express

visionmedia/express

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Hello World

var app = express.createServer(); app.get('/', function(req, res){

res.send('Hello World'); }); app.listen(3000);

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Socket.IO

http://socket.io/

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第116页

Push from the Server

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(){ … }) });

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第117页

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(){ … }) });

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第118页

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!"}); });

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CoffeeScript

jashkenas/coffee-script

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第120页

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)) });

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第121页

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

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第122页

Vows

cloudhead/vows http://vowjs.org/

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No Samples

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Is it Right For Me?

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It Depends

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The Checklist

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Control the Stack

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Comfortable with Change

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Full Control Over App Logic

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Lots of Small Independent

Pieces

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Then Maybe

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Where to?

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nodejs.org

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#Node.js (freenode)

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Travis Swicegood

travisswicegood.com @tswicegood

travis@domain51.com http://joind.in/2810

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