/*
 * Copyright (C) 2014 Cloudius Systems, Ltd.
 */

#include "core/smp.hh"
#include "core/app-template.hh"
#include "core/future-util.hh"

using namespace net;
using namespace std::chrono_literals;

class udp_server {
private:
    udp_channel _chan;
    timer<> _stats_timer;
    uint64_t _n_sent {};
public:
    void start(uint16_t port) {
        ipv4_addr listen_addr{port};
        _chan = engine.net().make_udp_channel(listen_addr);

        _stats_timer.set_callback([this] {
            std::cout << "Out: " << _n_sent << " pps" << std::endl;
            _n_sent = 0;
        });
        _stats_timer.arm_periodic(1s);

        keep_doing([this] {
            return _chan.receive().then([this] (udp_datagram dgram) {
                return _chan.send(dgram.get_src(), std::move(dgram.get_data())).then([this] {
                    _n_sent++;
                });
            });
        });
    }
};

namespace bpo = boost::program_options;

int main(int ac, char ** av) {
    app_template app;
    app.add_options()
        ("port", bpo::value<uint16_t>()->default_value(10000), "UDP server port") ;
    return app.run(ac, av, [&] {
        auto&& config = app.configuration();
        uint16_t port = config["port"].as<uint16_t>();
        auto server = new distributed<udp_server>;
        server->start().then([server = std::move(server), port] () mutable {
            server->invoke_on_all(&udp_server::start, port);
        }).then([port] {
            std::cout << "Seastar UDP server listening on port " << port << " ...\n";
        });
    });
}