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//! TCP backed channel and listener implementations.
//!
//! ```no_run
//! #[urpc::service]
//! trait Hello {
//! type Error = ();
//!
//! async fn hello(name: String) -> String;
//! }
//!
//! struct HelloServer;
//!
//! impl Hello for HelloServer {
//! async fn hello(&self, _ctx: urpc::Context, name: String) -> Result<String, ()> {
//! Ok(format!("Hello, {name}!"))
//! }
//! }
//!
//! #[tokio::main]
//! async fn main() -> Result<(), Box<dyn std::error::Error>>{
//! let listener = urpc::tcp::bind("0.0.0.0:3000").await?;
//!
//! // spawn the server
//! tokio::spawn(async move {
//! urpc::Server::default()
//! .with_listener(listener)
//! .with_service(HelloServer.into_service())
//! .serve()
//! .await
//! });
//!
//! // create a client
//! let channel = urpc::ClientChannel::new(urpc::tcp::connect("127.0.0.1:3000").await?);
//! let client = HelloClient::new(channel);
//! let greeting = client.hello("World".into()).await.unwrap();
//! assert_eq!(greeting, "Hello, World!");
//! Ok(())
//! }
//! ```
use std::pin::Pin;
use futures::{Sink, Stream};
use tokio::{
net::{TcpListener, TcpStream, ToSocketAddrs},
sync::mpsc::Receiver,
task::AbortHandle,
};
use tokio_util::codec::Framed;
use crate::{
Channel, Listener,
protocol::{RpcMessage, RpcMessageCodec},
};
pub struct TcpChannel(Framed<TcpStream, RpcMessageCodec>);
impl TcpChannel {
fn new(stream: TcpStream) -> Self {
Self(Framed::new(stream, RpcMessageCodec::default()))
}
pub async fn connect(addrs: impl ToSocketAddrs) -> std::io::Result<Self> {
let stream = TcpStream::connect(addrs).await?;
Ok(Self::new(stream))
}
}
impl Sink<RpcMessage> for TcpChannel {
type Error = std::io::Error;
fn poll_ready(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<std::result::Result<(), Self::Error>> {
Sink::poll_ready(Pin::new(&mut self.get_mut().0), cx)
}
fn start_send(self: Pin<&mut Self>, item: RpcMessage) -> std::result::Result<(), Self::Error> {
Sink::start_send(Pin::new(&mut self.get_mut().0), item)
}
fn poll_flush(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<std::result::Result<(), Self::Error>> {
Sink::poll_flush(Pin::new(&mut self.get_mut().0), cx)
}
fn poll_close(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<std::result::Result<(), Self::Error>> {
Sink::poll_close(Pin::new(&mut self.get_mut().0), cx)
}
}
impl Stream for TcpChannel {
type Item = std::io::Result<RpcMessage>;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
Stream::poll_next(Pin::new(&mut self.get_mut().0), cx)
}
}
impl Channel for TcpChannel {}
pub struct TcpChannelListener {
receiver: Receiver<TcpChannel>,
abort: AbortHandle,
}
impl Drop for TcpChannelListener {
fn drop(&mut self) {
self.abort.abort();
}
}
impl TcpChannelListener {
pub async fn bind(addrs: impl ToSocketAddrs) -> std::io::Result<Self> {
let listener = TcpListener::bind(addrs).await?;
let (sender, receiver) = tokio::sync::mpsc::channel(8);
let abort = tokio::spawn(async move {
while let Ok((stream, _addr)) = listener.accept().await {
if sender.send(TcpChannel::new(stream)).await.is_err() {
break;
}
}
})
.abort_handle();
Ok(Self { receiver, abort })
}
}
impl Stream for TcpChannelListener {
type Item = std::io::Result<TcpChannel>;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
self.get_mut().receiver.poll_recv(cx).map(|v| v.map(Ok))
}
}
impl Listener<TcpChannel> for TcpChannelListener {}
pub async fn bind(addrs: impl ToSocketAddrs) -> std::io::Result<TcpChannelListener> {
TcpChannelListener::bind(addrs).await
}
pub async fn connect(addrs: impl ToSocketAddrs) -> std::io::Result<TcpChannel> {
TcpChannel::connect(addrs).await
}
|
