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path: root/src/itf_http.rs
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use mio::{Ready,Token,Event};
use mio::tcp::TcpStream;
use std::net::SocketAddr;
use std::io::ErrorKind;
use listener::Interface;
use eventloop::{Machine,Context,TToken};
use std::sync::Arc;
use netbuf::Buf;


// TODO: Set a max size on the buffers and provide backpressure
pub struct ItfHttp {
    sock: TcpStream,
    addr: SocketAddr,
    io: Token,
    ioreg: Ready,
    rbuf: Buf,
    wbuf: Buf,
    iotimeout: TToken, /* timeout on any form of IO */
    itf: Arc<Interface>,
}


impl ItfHttp {
    pub fn new(itf: Arc<Interface>, sock: TcpStream, addr: SocketAddr) -> ItfHttp {
        ItfHttp {
            sock: sock,
            addr: addr,
            io: Token(0),
            ioreg: Ready::readable(),
            rbuf: Buf::new(),
            wbuf: Buf::new(),
            iotimeout: TToken(0),
            itf: itf,
        }
    }

    fn handle_read(&mut self, ctx: &mut Context) {
        match self.rbuf.read_from(&mut self.sock) {
            Err(err) => {
                match err.kind() {
                    ErrorKind::WouldBlock | ErrorKind::Interrupted => { },
                    _ => {
                        debug!("{}: Read error: {}", self.addr, err);
                        self.remove(ctx);
                    }
                }
                return;
            },
            Ok(0) => { // This behaviour isn't documented, unsure if it's intended.
                debug!("{}: Connection closed", self.addr);
                self.remove(ctx);
                return;
            },
            _ => {}
        }
        // This is where we parse the stuff, generate a request object, throw the request object
        // through some handlers to get a response and send it back. But for now let's just act
        // like we wanted to be an echo server all along.
        self.rbuf.write_to(&mut self.wbuf).unwrap();
    }

    fn handle_write(&mut self, ctx: &mut Context) {
        if let Err(err) = self.wbuf.write_to(&mut self.sock) {
            match err.kind() {
                ErrorKind::WouldBlock | ErrorKind::Interrupted => { },
                _ => {
                    debug!("{}: Write error: {}", self.addr, err);
                    self.remove(ctx);
                }
            }
        }
    }

    fn set_ioreg(&mut self, ctx: &mut Context) {
        // Optimization: If the write buffer was empty before but contains data now, we can already
        // try to write it out at this point. This way we can avoid going through the event loop if
        // the OS buffers have enough space.
        // TODO: Measure how effective this is in practice; if this only tends to happen on the
        // first write to a new socket then it might not be worth the effort.
        if self.wbuf.len() > 0 && !self.ioreg.contains(Ready::writable()) {
            self.handle_write(ctx);
            if ctx.is_removed() {
                return;
            }
        }

        let mut reg = Ready::readable();
        if self.wbuf.len() > 0 {
            reg.insert(Ready::writable());
        }
        if reg != self.ioreg {
            self.ioreg = reg;
            ctx.reregister(&self.sock, self.io, self.ioreg);
        }
        ctx.reset_timeout(self.iotimeout, self.itf.cfg.io_timeout);
    }

    fn remove(&mut self, ctx: &mut Context) {
        self.itf.release();
        ctx.deregister(&self.sock, self.io);
        ctx.cancel_timeout(self.iotimeout);
        ctx.remove();
    }
}


impl Machine for ItfHttp {
    fn init(&mut self, ctx: &mut Context) {
        self.io = ctx.register(&self.sock, self.ioreg);
        self.iotimeout = ctx.set_timeout(self.itf.cfg.io_timeout);
    }

    fn handle(&mut self, ctx: &mut Context, ev: Event) {
        if ev.kind().is_readable() {
            self.handle_read(ctx);
        }
        if !ctx.is_removed() && ev.kind().is_writable() {
            self.handle_write(ctx);
        }
        if !ctx.is_removed() {
            self.set_ioreg(ctx);
        }
    }

    fn timeout(&mut self, ctx: &mut Context, _: TToken) {
        debug!("{}: No IO activity in {} seconds", self.addr, self.itf.cfg.io_timeout.as_secs());
        self.remove(ctx);
    }
}