Client implementation for JSON time service by ntp.nict.jp

ntp.js

(function(){
	var SERVERS = [
		"http://ntp-a1.nict.go.jp/cgi-bin/jsont",
		"http://ntp-b1.nict.go.jp/cgi-bin/jsont"
	],
	http = require("http");

	(function(){
		var Server = function(serverName){
			var responseOn = 0,
			jsont = function(body){
				return body;
			},
			fireServerReq = function(postrun){
				return http.get(encodeURI(serverName + "?" + (new Date().getTime() / 1000).toString()), postrun);
			},
			ntpStat = function(){
				process.stdout.write(serverRes.id + ": ");
				process.stdout.write(new Date(serverRes.st * 1000) + ", ");
				process.stdout.write("rtt " + (responseOn - serverRes.it).toString() + ", ");
				process.stdout.write("diff " + (serverRes.st - serverRes.it - (responseOn - serverRes.it) / 2).toString() + "\n");
			},
			receptor = function(res){
				var fullStr = "";

				res.on("data", function(chunk){
					fullStr += chunk.toString();
				});

				res.on("end", function(){
					serverRes = eval(fullStr);
					ntpStat();
				});
			};

			this.sync = function(){
				fireServerReq(receptor).on("response", function(){ responseOn = new Date().getTime() / 1000; });
			};
		};

		SERVERS.forEach(function(server){
			var thisSrv = new Server(server);
			thisSrv.sync();
		});
	})();
})();