iostat server

var sys		= require("sys"),
	http	= require("http"),
	ws		= require('./deps/node-websocket-server/lib/ws'),
	fs		= require("fs");

var iostat = require("child_process").spawn("iostat",["-w 1"]);
var httpServer = http.createServer();
var server = ws.createServer({debug:true},httpServer);

// Format iostat date
function format (data){
	var output_data = data.toString();
	console.log(output_data);
	header = 'disk0            cpu       load average';
	if (output_data.match(header)){
		console.log("ignore header");
	}else{
		var output_array = output_data.replace(/^\s+|\s+$/g,"").split(/\s+/);
		for (var i=0; i < output_array.length; i++){
			output_array[i] = parseFloat( output_array[i]);
		};
		output_hash = {
			date:new Date(),
				 disk:{
					kpt:output_array[0],
					tps:output_array[1],
					mbs:output_array[2]
				},
				cpu:{
					us:output_array[3],
					sy:output_array[4],
					id:output_array[5]
				},
				load_average:{
					m1:output_array[6],
					m5:output_array[7],
					m15:output_array[8]
				}
		}
		return JSON.stringify(output_hash);
	}
}
server.addListener("connection",function(conn){
		console.log("opened connection: "+conn.id);
		server.send(conn.id,"connected as:"+conn.id);
		iostat.stdout.on('data',function(data){
			console.log(typeof(data));
			console.log('stdout: '+data);
			console.log('stdout: '+format(data));
			server.send(conn.id, format(data));
		});
		server.send(conn.id, "Connected as: "+conn.id);
});
server.addListener("close",function(conn){
		console.log("closed connection: "+conn.id);
		conn.broadcast("<"+conn.id+"> disconnected");
});
server.listen(9000);