nodejs websocket tutorial

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Tommaso
02 Sep 2016
1/*
2Author: Logan Smith - Perkins
3*/
4
5// Importing the http library, used to start servers
6const http = require('http');
7// Importing the websocket library which is used to interface between webpage and nodejs
8const WebSocketServer = require('websocket').server;
9// This server is created using the http createServer function, which enables the user to create a http connection with a webpage
10const server =- http.createServer();
11// The server then listens on the port specified
12server.listen(7000);
13
14// We then create a new variable which will store the actual server I'll be running
15const wsServer = new WebSocketServer({
16	// Then we set the parameter of httpServer to the server variable that we said that would be listening on the port specified
17	httpServer : server
18});
19
20// Next we check if someome is trying to connect to the server, i.e. the name request, it's requesting access to the server
21wsServer.on('request', function(request){
22	// We store the actual connection as a variable and we accept that client to connect to this server
23	const connection = request.accept(null, request.origin);
24	// This function is run when this client sends a message to the server.
25	connection.on('message', function(message){
26		// We print out to the console the recieved message decoded to utf8
27		console.log("Recieved Message: " + message.utf8Data);
28		// Then we send specifically to this connection back a message
29		connection.sendUTF("Hello this is the websocket server.");
30	});
31	// This code is run when the user disconnects from the server.
32	connection.on('close', function(reasonCode, description){
33		// We just print to the console that a client has disconnected from the server.
34		console.log("A client has disconnected.");
35	});
36});
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