How to get all established connections to vertx based http server? - vert.x

Question

I have got https server run by vertx http stack. Is there a way to get client IP addresses for all established connections (i.e. for audit, security, monitoring, QoS and other purposes). Ideally, I would like to have event (callback) driven API notifying about established and closed connections. How can I achieve it?
Current workaround is to poll a tool similar to netstat, but it is very inconvenient and not really real-time (i.e. short connections can be missed).

Answer 1

Github community responded with the answer: https://github.com/vert-x3/vertx-web/issues/685
You can use the HttpServer connection handler and manage it yourself easily:
server.connectionHandler(conn -> {
// Track conn.remoteAddress()
conn.closeHandler(v -> {
// Cleanup track of conn.remoteAddress()
});
});

Answer 2

In my example I'll write all IP addresses to a console. But of course you could write it to a log file, DB, or some other place of your choice.
Vertx vertx = Vertx.vertx();
// This your regular router
Router router = Router.router(vertx);
// We'll have two routes, just for fun
router.route("/a").handler((ctx) -> {
ctx.response().end("A");
});
router.route("/b").handler((ctx) -> {
ctx.response().end("B");
});
Router filterRouter = Router.router(vertx);
filterRouter.get().handler((ctx)->{
System.out.println("IP is " + ctx.request().remoteAddress());
// Forward to your actual router
ctx.next();
});
filterRouter.mountSubRouter("/", router);
vertx.createHttpServer().requestHandler(filterRouter::accept).listen(8080);