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|
//! MPSC channel backed channel and listener implementations.
//!
//! This module provides an mpsc channel based listener/channel implementation that can be useful
//! to for tests.
//!
//! The current implementation uses [`tokio`]'s unbounded mpsc channels.
//!
//! ```
//! #[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 (dialer, listener) = urpc::channel::new();
//!
//! // 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(dialer.connect()?);
//! let client = HelloClient::new(channel);
//! let greeting = client.hello("World".into()).await.unwrap();
//! assert_eq!(greeting, "Hello, World!");
//! Ok(())
//! }
//! ```
use futures::{Sink, Stream};
use tokio::sync::mpsc;
use crate::protocol::RpcMessage;
pub struct ChannelListener {
receiver: mpsc::UnboundedReceiver<Channel>,
}
impl Stream for ChannelListener {
type Item = std::io::Result<Channel>;
fn poll_next(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
match self.get_mut().receiver.poll_recv(cx) {
std::task::Poll::Ready(Some(c)) => std::task::Poll::Ready(Some(Ok(c))),
std::task::Poll::Ready(None) => std::task::Poll::Ready(None),
std::task::Poll::Pending => std::task::Poll::Pending,
}
}
}
impl crate::Listener<Channel> for ChannelListener {}
pub struct ChannelDialer {
sender: mpsc::UnboundedSender<Channel>,
}
impl ChannelDialer {
fn new() -> (Self, ChannelListener) {
let (sender, receiver) = mpsc::unbounded_channel();
(Self { sender }, ChannelListener { receiver })
}
pub fn connect(&self) -> std::io::Result<Channel> {
let (ch1, ch2) = Channel::new();
self.sender.send(ch1).expect("TODO: remove this");
Ok(ch2)
}
}
pub struct Channel {
sender: mpsc::UnboundedSender<RpcMessage>,
receiver: mpsc::UnboundedReceiver<RpcMessage>,
}
impl Channel {
fn new() -> (Self, Self) {
let (sender0, receiver0) = mpsc::unbounded_channel();
let (sender1, receiver1) = mpsc::unbounded_channel();
(
Self {
sender: sender0,
receiver: receiver1,
},
Self {
sender: sender1,
receiver: receiver0,
},
)
}
}
impl Stream for Channel {
type Item = std::io::Result<RpcMessage>;
fn poll_next(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
match self.get_mut().receiver.poll_recv(cx) {
std::task::Poll::Ready(Some(msg)) => std::task::Poll::Ready(Some(Ok(msg))),
std::task::Poll::Ready(None) => std::task::Poll::Ready(None),
std::task::Poll::Pending => std::task::Poll::Pending,
}
}
}
impl Sink<RpcMessage> for Channel {
type Error = std::io::Error;
fn poll_ready(
self: std::pin::Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
return std::task::Poll::Ready(Ok(()));
}
fn start_send(self: std::pin::Pin<&mut Self>, item: RpcMessage) -> Result<(), Self::Error> {
match self.sender.send(item) {
Ok(()) => Ok(()),
Err(err) => Err(std::io::Error::other(err)),
}
}
fn poll_flush(
self: std::pin::Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
std::task::Poll::Ready(Ok(()))
}
fn poll_close(
self: std::pin::Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
std::task::Poll::Ready(Ok(()))
}
}
impl crate::Channel for Channel {}
pub fn new() -> (ChannelDialer, ChannelListener) {
ChannelDialer::new()
}
|
