From 595d165479b8b12e456f39205d8433b822b07487 Mon Sep 17 00:00:00 2001
From: cel 🌸 <cel@bunny.garden>
Date: Fri, 6 Dec 2024 06:31:20 +0000
Subject: implement sink and stream properly UNFOLD UNFOLD

---
 jabber/src/jabber_stream/bound_stream.rs | 153 +++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 jabber/src/jabber_stream/bound_stream.rs

(limited to 'jabber/src/jabber_stream')

diff --git a/jabber/src/jabber_stream/bound_stream.rs b/jabber/src/jabber_stream/bound_stream.rs
new file mode 100644
index 0000000..ca93421
--- /dev/null
+++ b/jabber/src/jabber_stream/bound_stream.rs
@@ -0,0 +1,153 @@
+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))
+}
-- 
cgit