#![feature(arbitrary_self_types, async_await)]
#![deny(missing_docs, missing_debug_implementations)]
use async_bincode::{AsyncBincodeStream, AsyncDestination};
use futures::{compat::*, prelude::*, ready};
use pin_utils::unsafe_pinned;
use serde::{Deserialize, Serialize};
use std::{
error::Error,
io,
marker::PhantomData,
net::SocketAddr,
pin::Pin,
task::{Context, Poll},
};
use tokio_io::{AsyncRead, AsyncWrite};
use tokio_tcp::{TcpListener, TcpStream};
#[derive(Debug)]
pub struct Transport<S, Item, SinkItem> {
inner: Compat01As03Sink<AsyncBincodeStream<S, Item, SinkItem, AsyncDestination>, SinkItem>,
}
impl<S, Item, SinkItem> Transport<S, Item, SinkItem> {
unsafe_pinned!(
inner: Compat01As03Sink<AsyncBincodeStream<S, Item, SinkItem, AsyncDestination>, SinkItem>
);
}
impl<S, Item, SinkItem> Stream for Transport<S, Item, SinkItem>
where
S: AsyncRead,
Item: for<'a> Deserialize<'a>,
{
type Item = io::Result<Item>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<io::Result<Item>>> {
match self.inner().poll_next(cx) {
Poll::Pending => Poll::Pending,
Poll::Ready(None) => Poll::Ready(None),
Poll::Ready(Some(Ok(next))) => Poll::Ready(Some(Ok(next))),
Poll::Ready(Some(Err(e))) => {
Poll::Ready(Some(Err(io::Error::new(io::ErrorKind::Other, e))))
}
}
}
}
impl<S, Item, SinkItem> Sink<SinkItem> for Transport<S, Item, SinkItem>
where
S: AsyncWrite,
SinkItem: Serialize,
{
type SinkError = io::Error;
fn start_send(self: Pin<&mut Self>, item: SinkItem) -> io::Result<()> {
self.inner()
.start_send(item)
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))
}
fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
convert(self.inner().poll_ready(cx))
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
convert(self.inner().poll_flush(cx))
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
convert(self.inner().poll_close(cx))
}
}
fn convert<E: Into<Box<Error + Send + Sync>>>(poll: Poll<Result<(), E>>) -> Poll<io::Result<()>> {
match poll {
Poll::Pending => Poll::Pending,
Poll::Ready(Ok(())) => Poll::Ready(Ok(())),
Poll::Ready(Err(e)) => Poll::Ready(Err(io::Error::new(io::ErrorKind::Other, e))),
}
}
impl<Item, SinkItem> rpc::Transport for Transport<TcpStream, Item, SinkItem>
where
Item: for<'de> Deserialize<'de>,
SinkItem: Serialize,
{
type Item = Item;
type SinkItem = SinkItem;
fn peer_addr(&self) -> io::Result<SocketAddr> {
self.inner.get_ref().get_ref().peer_addr()
}
fn local_addr(&self) -> io::Result<SocketAddr> {
self.inner.get_ref().get_ref().local_addr()
}
}
pub fn new<Item, SinkItem>(io: TcpStream) -> Transport<TcpStream, Item, SinkItem>
where
Item: for<'de> Deserialize<'de>,
SinkItem: Serialize,
{
Transport::from(io)
}
impl<S, Item, SinkItem> From<S> for Transport<S, Item, SinkItem> {
fn from(inner: S) -> Self {
Transport {
inner: Compat01As03Sink::new(AsyncBincodeStream::from(inner).for_async()),
}
}
}
pub async fn connect<Item, SinkItem>(
addr: &SocketAddr,
) -> io::Result<Transport<TcpStream, Item, SinkItem>>
where
Item: for<'de> Deserialize<'de>,
SinkItem: Serialize,
{
Ok(new(TcpStream::connect(addr).compat().await?))
}
pub fn listen<Item, SinkItem>(addr: &SocketAddr) -> io::Result<Incoming<Item, SinkItem>>
where
Item: for<'de> Deserialize<'de>,
SinkItem: Serialize,
{
let listener = TcpListener::bind(addr)?;
let local_addr = listener.local_addr()?;
let incoming = listener.incoming().compat();
Ok(Incoming {
incoming,
local_addr,
ghost: PhantomData,
})
}
#[derive(Debug)]
pub struct Incoming<Item, SinkItem> {
incoming: Compat01As03<tokio_tcp::Incoming>,
local_addr: SocketAddr,
ghost: PhantomData<(Item, SinkItem)>,
}
impl<Item, SinkItem> Incoming<Item, SinkItem> {
unsafe_pinned!(incoming: Compat01As03<tokio_tcp::Incoming>);
pub fn local_addr(&self) -> SocketAddr {
self.local_addr
}
}
impl<Item, SinkItem> Stream for Incoming<Item, SinkItem>
where
Item: for<'a> Deserialize<'a>,
SinkItem: Serialize,
{
type Item = io::Result<Transport<TcpStream, Item, SinkItem>>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let next = ready!(self.incoming().poll_next(cx)?);
Poll::Ready(next.map(|conn| Ok(new(conn))))
}
}