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use futures::{future::{self, FutureResult}, prelude::*};
use susyp2p_core::upgrade::{InboundUpgrade, OutboundUpgrade, UpgradeInfo, Negotiated};
use log::debug;
use std::{io, iter, sync::atomic};
use std::io::{Error as IoError};
use tokio_io::{AsyncRead, AsyncWrite};
pub struct Yamux<C>(yamux::Connection<C>, atomic::AtomicBool);
impl<C> Yamux<C>
where
C: AsyncRead + AsyncWrite + 'static
{
pub fn new(c: C, mut cfg: yamux::Config, mode: yamux::Mode) -> Self {
cfg.set_read_after_close(false);
Yamux(yamux::Connection::new(c, cfg, mode), atomic::AtomicBool::new(false))
}
}
impl<C> susyp2p_core::StreamMuxer for Yamux<C>
where
C: AsyncRead + AsyncWrite + 'static
{
type Substream = yamux::StreamHandle<C>;
type OutboundSubstream = FutureResult<Option<Self::Substream>, io::Error>;
fn poll_inbound(&self) -> Poll<Self::Substream, IoError> {
match self.0.poll() {
Err(e) => {
debug!("connection error: {}", e);
Err(io::Error::new(io::ErrorKind::Other, e))
}
Ok(Async::NotReady) => Ok(Async::NotReady),
Ok(Async::Ready(None)) => Err(io::ErrorKind::BrokenPipe.into()),
Ok(Async::Ready(Some(stream))) => {
self.1.store(true, atomic::Ordering::Release);
Ok(Async::Ready(stream))
}
}
}
fn open_outbound(&self) -> Self::OutboundSubstream {
let stream = self.0.open_stream().map_err(|e| io::Error::new(io::ErrorKind::Other, e));
future::result(stream)
}
fn poll_outbound(&self, substream: &mut Self::OutboundSubstream) -> Poll<Self::Substream, IoError> {
match substream.poll()? {
Async::Ready(Some(s)) => Ok(Async::Ready(s)),
Async::Ready(None) => Err(io::ErrorKind::BrokenPipe.into()),
Async::NotReady => Ok(Async::NotReady),
}
}
fn destroy_outbound(&self, _: Self::OutboundSubstream) {
}
fn read_substream(&self, sub: &mut Self::Substream, buf: &mut [u8]) -> Poll<usize, IoError> {
let result = sub.poll_read(buf);
if let Ok(Async::Ready(_)) = result {
self.1.store(true, atomic::Ordering::Release);
}
result
}
fn write_substream(&self, sub: &mut Self::Substream, buf: &[u8]) -> Poll<usize, IoError> {
sub.poll_write(buf)
}
fn flush_substream(&self, sub: &mut Self::Substream) -> Poll<(), IoError> {
sub.poll_flush()
}
fn shutdown_substream(&self, sub: &mut Self::Substream) -> Poll<(), IoError> {
sub.shutdown()
}
fn destroy_substream(&self, _: Self::Substream) {
}
fn is_remote_acknowledged(&self) -> bool {
self.1.load(atomic::Ordering::Acquire)
}
fn close(&self) -> Poll<(), IoError> {
self.0.close().map_err(|e| io::Error::new(io::ErrorKind::Other, e))
}
fn flush_all(&self) -> Poll<(), IoError> {
self.0.flush().map_err(|e| io::Error::new(io::ErrorKind::Other, e))
}
}
#[derive(Clone)]
pub struct Config(yamux::Config);
impl Config {
pub fn new(cfg: yamux::Config) -> Self {
Config(cfg)
}
}
impl Default for Config {
fn default() -> Self {
Config(yamux::Config::default())
}
}
impl UpgradeInfo for Config {
type Info = &'static [u8];
type InfoIter = iter::Once<Self::Info>;
fn protocol_info(&self) -> Self::InfoIter {
iter::once(b"/yamux/1.0.0")
}
}
impl<C> InboundUpgrade<C> for Config
where
C: AsyncRead + AsyncWrite + 'static,
{
type Output = Yamux<Negotiated<C>>;
type Error = io::Error;
type Future = FutureResult<Yamux<Negotiated<C>>, io::Error>;
fn upgrade_inbound(self, i: Negotiated<C>, _: Self::Info) -> Self::Future {
future::ok(Yamux::new(i, self.0, yamux::Mode::Server))
}
}
impl<C> OutboundUpgrade<C> for Config
where
C: AsyncRead + AsyncWrite + 'static,
{
type Output = Yamux<Negotiated<C>>;
type Error = io::Error;
type Future = FutureResult<Yamux<Negotiated<C>>, io::Error>;
fn upgrade_outbound(self, i: Negotiated<C>, _: Self::Info) -> Self::Future {
future::ok(Yamux::new(i, self.0, yamux::Mode::Client))
}
}