Faking a slow DNS server to show setTimeout not affected by dns resolution timing

README.md

node dnsLagDnsServer.js

node dnsLagServer.js

node dnsLag.js

--- dnsLag.js should timeout if the timeout was affected

dnsLag.js

var dns = require("dns");
var http = require("http");

dns.setServers(["127.0.0.1"]);

var req = http.request({
	host : "www.foo.com", // routed through local so it doesn't matter
	port : 8080
}, function(res) {
	var data = "";
	
	res.on("data", (chunk) => data += chunk);
	res.on("end", () => {
		console.log("request complete", data);
	});
});

req.setTimeout(500); // this timeout should halt the request becuase DNS will take 1000ms, but it doesn't

req.on("error", (e) => {
	console.log("error", e);
});

req.end();

dnsLagDnsServer.js

var proxyDns = require("proxy-dns");

var server = new proxyDns.default({
	ttl : 600
});

server.use(function* (next) {
	console.log("got request", this.domain);
	yield new Promise((resolve, reject) => {
		setTimeout(() => {
			this.answers = ["127.0.0.1"];
			resolve();
		}, 1000);
	});
	yield next;
});

server.listen(53);

dnsLagServer.js

var http = require("http");

var server = http.createServer((req, res) => {
	console.log("connection received");
	setTimeout(function() {
		res.end("content");
	}, 100);
});

server.listen(8080, () => {
	console.log("server booted");
});