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    use futures::sync::oneshot;
    use futures::Future;
    use net2::TcpStreamExt;
    use slab::Slab;
    use std::rc::Rc;
    use std::{net, time};
    use tokio::executor::current_thread;
    use tokio_reactor::Handle;
    use tokio_tcp::TcpStream;

    #[cfg(any(feature = "tls", feature = "alpn"))]
    use futures::future;

    #[cfg(feature = "tls")]
    use native_tls::TlsAcceptor;
    #[cfg(feature = "tls")]
    use tokio_tls::TlsAcceptorExt;

    #[cfg(feature = "alpn")]
    use openssl::ssl::SslAcceptor;
    #[cfg(feature = "alpn")]
    use tokio_openssl::SslAcceptorExt;

    use actix::msgs::StopArbiter;
    use actix::{Actor, Arbiter, AsyncContext, Context, Handler, Message, Response};

    use server::channel::HttpChannel;
    use server::settings::{ServerSettings, WorkerSettings};
    use server::{HttpHandler, KeepAlive};

    #[derive(Message)]
    pub(crate) struct Conn<T> {
        pub io: T,
        pub token: usize,
        pub peer: Option<net::SocketAddr>,
        pub http2: bool,
    }

    #[derive(Clone)]
    pub(crate) struct SocketInfo {
        pub addr: net::SocketAddr,
        pub htype: StreamHandlerType,
    }

    /// Stop worker message. Returns `true` on successful shutdown
    /// and `false` if some connections still alive.
    pub(crate) struct StopWorker {
        pub graceful: Option<time::Duration>,
    }

    impl Message for StopWorker {
        type Result = Result<bool, ()>;
    }

    /// Http worker
    ///
    /// Worker accepts Socket objects via unbounded channel and start requests
    /// processing.
    pub(crate) struct Worker<H>
    where
        H: HttpHandler + 'static,
    {
        settings: Rc<WorkerSettings<H>>,
        socks: Slab<SocketInfo>,
        tcp_ka: Option<time::Duration>,
    }

    impl<H: HttpHandler + 'static> Worker<H> {
        pub(crate) fn new(
            h: Vec<H>, socks: Slab<SocketInfo>, keep_alive: KeepAlive,
            settings: ServerSettings,
        ) -> Worker<H> {
            let tcp_ka = if let KeepAlive::Tcp(val) = keep_alive {
                Some(time::Duration::new(val as u64, 0))
            } else {
                None
            };

            Worker {
                settings: Rc::new(WorkerSettings::new(h, keep_alive, settings)),
                socks,
                tcp_ka,
            }
        }

        fn update_time(&self, ctx: &mut Context<Self>) {
            self.settings.update_date();
            ctx.run_later(time::Duration::new(1, 0), |slf, ctx| slf.update_time(ctx));
        }

        fn shutdown_timeout(
            &self, ctx: &mut Context<Self>, tx: oneshot::Sender<bool>, dur: time::Duration,
        ) {
            // sleep for 1 second and then check again
            ctx.run_later(time::Duration::new(1, 0), move |slf, ctx| {
                let num = slf.settings.num_channels();
                if num == 0 {
                    let _ = tx.send(true);
                    Arbiter::current().do_send(StopArbiter(0));
                } else if let Some(d) = dur.checked_sub(time::Duration::new(1, 0)) {
                    slf.shutdown_timeout(ctx, tx, d);
                } else {
                    info!("Force shutdown http worker, {} connections", num);
                    slf.settings.head().traverse::<TcpStream, H>();
                    let _ = tx.send(false);
                    Arbiter::current().do_send(StopArbiter(0));
                }
            });
        }
    }

    impl<H: 'static> Actor for Worker<H>
    where
        H: HttpHandler + 'static,
    {
        type Context = Context<Self>;

        fn started(&mut self, ctx: &mut Self::Context) {
            self.update_time(ctx);
        }
    }

    impl<H> Handler<Conn<net::TcpStream>> for Worker<H>
    where
        H: HttpHandler + 'static,
    {
        type Result = ();

        fn handle(&mut self, msg: Conn<net::TcpStream>, _: &mut Context<Self>) {
            if self.tcp_ka.is_some() && msg.io.set_keepalive(self.tcp_ka).is_err() {
                error!("Can not set socket keep-alive option");
            }
            self.socks
                .get_mut(msg.token)
                .unwrap()
                .htype
                .handle(Rc::clone(&self.settings), msg);
        }
    }

    /// `StopWorker` message handler
    impl<H> Handler<StopWorker> for Worker<H>
    where
        H: HttpHandler + 'static,
    {
        type Result = Response<bool, ()>;

        fn handle(&mut self, msg: StopWorker, ctx: &mut Context<Self>) -> Self::Result {
            let num = self.settings.num_channels();
            if num == 0 {
                info!("Shutting down http worker, 0 connections");
                Response::reply(Ok(true))
            } else if let Some(dur) = msg.graceful {
                info!("Graceful http worker shutdown, {} connections", num);
                let (tx, rx) = oneshot::channel();
                self.shutdown_timeout(ctx, tx, dur);
                Response::async(rx.map_err(|_| ()))
            } else {
                info!("Force shutdown http worker, {} connections", num);
                self.settings.head().traverse::<TcpStream, H>();
                Response::reply(Ok(false))
            }
        }
    }

    #[derive(Clone)]
    pub(crate) enum StreamHandlerType {
        Normal,
        #[cfg(feature = "tls")]
        Tls(TlsAcceptor),
        #[cfg(feature = "alpn")]
        Alpn(SslAcceptor),
    }

    impl StreamHandlerType {
        fn handle<H: HttpHandler>(
            &mut self, h: Rc<WorkerSettings<H>>, msg: Conn<net::TcpStream>,
        ) {
            match *self {
                StreamHandlerType::Normal => {
                    let _ = msg.io.set_nodelay(true);
                    let io = TcpStream::from_std(msg.io, &Handle::default())
                        .expect("failed to associate TCP stream");

                    current_thread::spawn(HttpChannel::new(h, io, msg.peer, msg.http2));
                }
                #[cfg(feature = "tls")]
                StreamHandlerType::Tls(ref acceptor) => {
                    let Conn {
                        io, peer, http2, ..
                    } = msg;
                    let _ = io.set_nodelay(true);
                    let io = TcpStream::from_std(io, &Handle::default())
                        .expect("failed to associate TCP stream");

                    current_thread::spawn(TlsAcceptorExt::accept_async(acceptor, io).then(
                        move |res| {
                            match res {
                                Ok(io) => current_thread::spawn(HttpChannel::new(
                                    h, io, peer, http2,
                                )),
                                Err(err) => {
                                    trace!("Error during handling tls connection: {}", err)
                                }
                            };
                            future::result(Ok(()))
                        },
                    ));
                }
                #[cfg(feature = "alpn")]
                StreamHandlerType::Alpn(ref acceptor) => {
                    let Conn { io, peer, .. } = msg;
                    let _ = io.set_nodelay(true);
                    let io = TcpStream::from_std(io, &Handle::default())
                        .expect("failed to associate TCP stream");

                    current_thread::spawn(SslAcceptorExt::accept_async(acceptor, io).then(
                        move |res| {
                            match res {
                                Ok(io) => {
                                    let http2 = if let Some(p) =
                                        io.get_ref().ssl().selected_alpn_protocol()
                                    {
                                        p.len() == 2 && &p == b"h2"
                                    } else {
                                        false
                                    };
                                    current_thread::spawn(HttpChannel::new(
                                        h, io, peer, http2,
                                    ));
                                }
                                Err(err) => {
                                    trace!("Error during handling tls connection: {}", err)
                                }
                            };
                            future::result(Ok(()))
                        },
                    ));
                }
            }
        }

        pub(crate) fn scheme(&self) -> &'static str {
            match *self {
                StreamHandlerType::Normal => "http",
                #[cfg(feature = "tls")]
                StreamHandlerType::Tls(_) => "https",
                #[cfg(feature = "alpn")]
                StreamHandlerType::Alpn(_) => "https",
            }
        }
    }

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