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use crate::{Endpoint, muxing::StreamMuxer};
use futures::prelude::*;
use parking_lot::Mutex;
use std::{io, sync::atomic::{AtomicBool, Ordering}};
use tokio_io::{AsyncRead, AsyncWrite};
pub struct SingletonMuxer<TSocket> {
inner: Mutex<TSocket>,
substream_extracted: AtomicBool,
endpoint: Endpoint,
remote_acknowledged: AtomicBool,
}
impl<TSocket> SingletonMuxer<TSocket> {
pub fn new(inner: TSocket, endpoint: Endpoint) -> Self {
SingletonMuxer {
inner: Mutex::new(inner),
substream_extracted: AtomicBool::new(false),
endpoint,
remote_acknowledged: AtomicBool::new(false),
}
}
}
pub struct Substream {}
pub struct OutboundSubstream {}
impl<TSocket> StreamMuxer for SingletonMuxer<TSocket>
where
TSocket: AsyncRead + AsyncWrite,
{
type Substream = Substream;
type OutboundSubstream = OutboundSubstream;
type Error = io::Error;
fn poll_inbound(&self) -> Poll<Self::Substream, io::Error> {
match self.endpoint {
Endpoint::Dialer => return Ok(Async::NotReady),
Endpoint::Listener => {}
}
if !self.substream_extracted.swap(true, Ordering::Relaxed) {
Ok(Async::Ready(Substream {}))
} else {
Ok(Async::NotReady)
}
}
fn open_outbound(&self) -> Self::OutboundSubstream {
OutboundSubstream {}
}
fn poll_outbound(&self, _: &mut Self::OutboundSubstream) -> Poll<Self::Substream, io::Error> {
match self.endpoint {
Endpoint::Listener => return Ok(Async::NotReady),
Endpoint::Dialer => {}
}
if !self.substream_extracted.swap(true, Ordering::Relaxed) {
Ok(Async::Ready(Substream {}))
} else {
Ok(Async::NotReady)
}
}
fn destroy_outbound(&self, _: Self::OutboundSubstream) {
}
unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [u8]) -> bool {
self.inner.lock().prepare_uninitialized_buffer(buf)
}
fn read_substream(&self, _: &mut Self::Substream, buf: &mut [u8]) -> Poll<usize, io::Error> {
let res = self.inner.lock().poll_read(buf);
if let Ok(Async::Ready(_)) = res {
self.remote_acknowledged.store(true, Ordering::Release);
}
res
}
fn write_substream(&self, _: &mut Self::Substream, buf: &[u8]) -> Poll<usize, io::Error> {
self.inner.lock().poll_write(buf)
}
fn flush_substream(&self, _: &mut Self::Substream) -> Poll<(), io::Error> {
self.inner.lock().poll_flush()
}
fn shutdown_substream(&self, _: &mut Self::Substream) -> Poll<(), io::Error> {
self.inner.lock().shutdown()
}
fn destroy_substream(&self, _: Self::Substream) {
}
fn is_remote_acknowledged(&self) -> bool {
self.remote_acknowledged.load(Ordering::Acquire)
}
fn close(&self) -> Poll<(), io::Error> {
self.flush_all()
}
fn flush_all(&self) -> Poll<(), io::Error> {
self.inner.lock().poll_flush()
}
}