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use std::future::ready;
use std::pin::pin;
use std::pin::Pin;
use std::sync::Arc;
use std::task::Poll;
use futures::ready;
use futures::FutureExt;
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 tokio::task::JoinHandle;
use crate::Error;
use super::JabberStream;
#[pin_project]
pub struct BoundJabberStream<S>
where
S: AsyncWrite + AsyncRead + Unpin + Send,
{
reader: Arc<Mutex<Reader<ReadHalf<S>>>>,
writer: Arc<Mutex<Writer<WriteHalf<S>>>>,
write_handle: Option<JoinHandle<Result<(), Error>>>,
read_handle: Option<JoinHandle<Result<Stanza, Error>>>,
}
impl<S> BoundJabberStream<S>
where
S: AsyncWrite + AsyncRead + Unpin + Send,
{
// TODO: look into biased mutex, to close stream ASAP
// TODO: put into connection
// pub async fn close_stream(self) -> Result<JabberStream<S>, Error> {
// let reader = self.reader.lock().await.into_self();
// let writer = self.writer.lock().await.into_self();
// // TODO: writer </stream:stream>
// return Ok(JabberStream { reader, writer });
// }
}
pub trait JabberStreamTrait: AsyncWrite + AsyncRead + Unpin + Send {}
impl<S> Sink<Stanza> for BoundJabberStream<S>
where
S: AsyncWrite + AsyncRead + Unpin + Send + 'static,
{
type Error = Error;
fn poll_ready(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
self.poll_flush(cx)
}
fn start_send(self: std::pin::Pin<&mut Self>, item: Stanza) -> Result<(), Self::Error> {
let this = self.project();
if let Some(_write_handle) = this.write_handle {
panic!("start_send called without poll_ready")
} else {
// TODO: switch to buffer of one rather than thread spawning and joining
*this.write_handle = Some(tokio::spawn(write(this.writer.clone(), item)));
Ok(())
}
}
fn poll_flush(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
let this = self.project();
Poll::Ready(if let Some(join_handle) = this.write_handle.as_mut() {
match ready!(join_handle.poll_unpin(cx)) {
Ok(state) => {
*this.write_handle = None;
state
}
Err(err) => {
*this.write_handle = None;
Err(err.into())
}
}
} else {
Ok(())
})
}
fn poll_close(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
self.poll_flush(cx)
}
}
impl<S> Stream for BoundJabberStream<S>
where
S: AsyncWrite + AsyncRead + Unpin + Send + 'static,
{
type Item = Result<Stanza, Error>;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
let this = self.project();
loop {
if let Some(join_handle) = this.read_handle.as_mut() {
let stanza = ready!(join_handle.poll_unpin(cx));
if let Ok(item) = stanza {
*this.read_handle = None;
return Poll::Ready(Some(item));
} else if let Err(err) = stanza {
return Poll::Ready(Some(Err(err.into())));
}
} else {
*this.read_handle = Some(tokio::spawn(read(this.reader.clone())))
}
}
}
}
impl<S> JabberStream<S>
where
S: AsyncWrite + AsyncRead + Unpin + Send,
{
pub fn to_bound_jabber(self) -> BoundJabberStream<S> {
let reader = Arc::new(Mutex::new(self.reader));
let writer = Arc::new(Mutex::new(self.writer));
BoundJabberStream {
writer,
reader,
write_handle: None,
read_handle: None,
}
}
}
pub async fn write<W: AsyncWrite + Unpin + Send>(
writer: Arc<Mutex<Writer<WriteHalf<W>>>>,
stanza: Stanza,
) -> Result<(), Error> {
{
let mut writer = writer.lock().await;
writer.write(&stanza).await?;
}
Ok(())
}
pub async fn read<R: AsyncRead + Unpin + Send>(
reader: Arc<Mutex<Reader<ReadHalf<R>>>>,
) -> Result<Stanza, Error> {
let stanza: Result<Stanza, Error>;
{
let mut reader = reader.lock().await;
stanza = reader.read().await.map_err(|e| e.into());
}
stanza
}
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