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use std::pin::pin;
use std::pin::Pin;
use std::sync::Arc;
use futures::{sink, stream, Sink, Stream};
use peanuts::{Reader, Writer};
use pin_project::pin_project;
use stanza::client::Stanza;
use tokio::io::{AsyncRead, AsyncWrite, ReadHalf, WriteHalf};
use tokio::sync::Mutex;
use crate::Error;
use super::JabberStream;
#[pin_project]
pub struct BoundJabberStream<R, W, S>
where
R: Stream,
W: Sink<Stanza>,
S: AsyncWrite + AsyncRead + Unpin + Send,
{
reader: Arc<Mutex<Option<Reader<ReadHalf<S>>>>>,
writer: Arc<Mutex<Option<Writer<WriteHalf<S>>>>>,
stream: R,
sink: W,
}
impl<R, W, S> BoundJabberStream<R, W, S>
where
R: Stream,
W: Sink<Stanza>,
S: AsyncWrite + AsyncRead + Unpin + Send,
{
// TODO: look into biased mutex, to close stream ASAP
pub async fn close_stream(self) -> Result<JabberStream<S>, Error> {
if let Some(reader) = self.reader.lock().await.take() {
if let Some(writer) = self.writer.lock().await.take() {
// TODO: writer </stream:stream>
return Ok(JabberStream { reader, writer });
}
}
return Err(Error::StreamClosed);
}
}
pub trait JabberStreamTrait: AsyncWrite + AsyncRead + Unpin + Send {}
impl<R, W, S> Sink<Stanza> for BoundJabberStream<R, W, S>
where
R: Stream,
W: Sink<Stanza> + Unpin,
S: AsyncWrite + AsyncRead + Unpin + Send,
{
type Error = <W as Sink<Stanza>>::Error;
fn poll_ready(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
let this = self.project();
pin!(this.sink).poll_ready(cx)
}
fn start_send(self: std::pin::Pin<&mut Self>, item: Stanza) -> Result<(), Self::Error> {
let this = self.project();
pin!(this.sink).start_send(item)
}
fn poll_flush(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
let this = self.project();
pin!(this.sink).poll_flush(cx)
}
fn poll_close(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
let this = self.project();
pin!(this.sink).poll_close(cx)
}
}
impl<R, W, S> Stream for BoundJabberStream<R, W, S>
where
R: Stream + Unpin,
W: Sink<Stanza>,
S: AsyncWrite + AsyncRead + Unpin + Send,
{
type Item = <R as Stream>::Item;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
let this = self.project();
pin!(this.stream).poll_next(cx)
}
}
impl<S> JabberStream<S>
where
S: AsyncWrite + AsyncRead + Unpin + Send,
{
pub fn to_bound_jabber(self) -> BoundJabberStream<impl Stream, impl Sink<Stanza>, S> {
let reader = Arc::new(Mutex::new(Some(self.reader)));
let writer = Arc::new(Mutex::new(Some(self.writer)));
let sink = sink::unfold(writer.clone(), |writer, s: Stanza| async move {
write(writer, s).await
});
let stream = stream::unfold(reader.clone(), |reader| async { read(reader).await });
BoundJabberStream {
sink,
stream,
writer,
reader,
}
}
}
pub async fn write<W: AsyncWrite + Unpin + Send>(
writer: Arc<Mutex<Option<Writer<WriteHalf<W>>>>>,
stanza: Stanza,
) -> Result<Arc<Mutex<Option<Writer<WriteHalf<W>>>>>, Error> {
{
if let Some(writer) = writer.lock().await.as_mut() {
writer.write(&stanza).await?;
} else {
return Err(Error::StreamClosed);
}
}
Ok(writer)
}
pub async fn read<R: AsyncRead + Unpin + Send>(
reader: Arc<Mutex<Option<Reader<ReadHalf<R>>>>>,
) -> Option<(
Result<Stanza, Error>,
Arc<Mutex<Option<Reader<ReadHalf<R>>>>>,
)> {
let stanza: Result<Stanza, Error>;
{
if let Some(reader) = reader.lock().await.as_mut() {
stanza = reader.read().await.map_err(|e| e.into());
} else {
stanza = Err(Error::StreamClosed)
};
}
Some((stanza, reader))
}
|
