1 files changed, 99 insertions, 0 deletions
diff --git a/client-native-rift/src/port.rs b/client-native-rift/src/port.rs
new file mode 100644
index 0000000..ae56f2c
--- /dev/null
+++ b/client-native-rift/src/port.rs
@@ -0,0 +1,99 @@
+use bytes::Bytes;
+use libkeks::{peer::Peer, protocol::ProvideInfo, DynFut, LocalResource};
+use log::{debug, error, info, warn};
+use std::{pin::Pin, sync::Arc};
+use tokio::{
+    io::{AsyncRead, AsyncReadExt},
+    net::TcpStream,
+    sync::RwLock,
+};
+
+pub struct PortExposer {
+    pub port: u16,
+    pub info: ProvideInfo,
+}
+
+impl LocalResource for PortExposer {
+    fn info(&self) -> ProvideInfo {
+        self.info.clone()
+    }
+
+    fn on_request(&self, peer: Arc<Peer>) -> DynFut<()> {
+        let id = self.info().id.clone();
+        let port = self.port;
+        Box::pin(async move {
+            let channel = peer
+                .peer_connection
+                .create_data_channel(&id, None)
+                .await
+                .unwrap();
+            let reader: Arc<RwLock<Option<Pin<Box<dyn AsyncRead + Send + Sync>>>>> =
+                Arc::new(RwLock::new(None));
+            {
+                let reader = reader.clone();
+                let channel2 = channel.clone();
+                channel.on_open(Box::new(move || {
+                    let reader = reader.clone();
+                    Box::pin(async move {
+                        info!("channel open");
+                        match TcpStream::connect(("127.0.0.1", port)).await {
+                            Ok(stream) => {
+                                *reader.write().await = Some(Box::pin(stream));
+                            }
+                            Err(e) => {
+                                warn!("upstream connect failed: {e}");
+                                channel2.close().await.unwrap();
+                            }
+                        }
+                    })
+                }))
+            }
+            {
+                let reader = reader.clone();
+                channel.on_close(Box::new(move || {
+                    let reader = reader.clone();
+                    Box::pin(async move {
+                        info!("channel closed");
+                        *reader.write().await = None;
+                    })
+                }))
+            }
+            {
+                let reader = reader.clone();
+                let channel2 = channel.clone();
+                channel
+                    .on_buffered_amount_low(Box::new(move || {
+                        let reader = reader.clone();
+                        let channel = channel2.clone();
+                        Box::pin(async move {
+                            debug!("buffered amount low");
+                            let mut buf = [0u8; 1 << 15];
+                            let size = reader
+                                .write()
+                                .await
+                                .as_mut()
+                                .unwrap()
+                                .read(&mut buf)
+                                .await
+                                .unwrap();
+                            if size == 0 {
+                                info!("reached EOF, closing channel");
+                                let _ = channel.send_text("end").await;
+                                channel.close().await.unwrap();
+                            } else {
+                                channel
+                                    .send(&Bytes::copy_from_slice(&buf[..size]))
+                                    .await
+                                    .unwrap();
+                            }
+                        })
+                    }))
+                    .await;
+                channel.set_buffered_amount_low_threshold(1).await;
+            }
+            channel.on_error(Box::new(move |err| {
+                Box::pin(async move { error!("channel error: {err}") })
+            }))
+        })
+    }
+}