conn.rs

  1use async_tungstenite::tungstenite::{Error as WebSocketError, Message as WebSocketMessage};
  2use futures::{SinkExt as _, StreamExt as _};
  3
  4pub struct Connection {
  5    pub(crate) tx:
  6        Box<dyn 'static + Send + Unpin + futures::Sink<WebSocketMessage, Error = WebSocketError>>,
  7    pub(crate) rx: Box<
  8        dyn 'static
  9            + Send
 10            + Unpin
 11            + futures::Stream<Item = Result<WebSocketMessage, WebSocketError>>,
 12    >,
 13}
 14
 15impl Connection {
 16    pub fn new<S>(stream: S) -> Self
 17    where
 18        S: 'static
 19            + Send
 20            + Unpin
 21            + futures::Sink<WebSocketMessage, Error = WebSocketError>
 22            + futures::Stream<Item = Result<WebSocketMessage, WebSocketError>>,
 23    {
 24        let (tx, rx) = stream.split();
 25        Self {
 26            tx: Box::new(tx),
 27            rx: Box::new(rx),
 28        }
 29    }
 30
 31    pub async fn send(&mut self, message: WebSocketMessage) -> Result<(), WebSocketError> {
 32        self.tx.send(message).await
 33    }
 34
 35    #[cfg(any(test, feature = "test-support"))]
 36    pub fn in_memory(
 37        executor: std::sync::Arc<gpui::executor::Background>,
 38    ) -> (Self, Self, std::sync::Arc<std::sync::atomic::AtomicBool>) {
 39        use std::sync::{
 40            atomic::{AtomicBool, Ordering::SeqCst},
 41            Arc,
 42        };
 43
 44        let killed = Arc::new(AtomicBool::new(false));
 45        let (a_tx, a_rx) = channel(killed.clone(), executor.clone());
 46        let (b_tx, b_rx) = channel(killed.clone(), executor);
 47        return (
 48            Self { tx: a_tx, rx: b_rx },
 49            Self { tx: b_tx, rx: a_rx },
 50            killed,
 51        );
 52
 53        fn channel(
 54            killed: Arc<AtomicBool>,
 55            executor: Arc<gpui::executor::Background>,
 56        ) -> (
 57            Box<dyn Send + Unpin + futures::Sink<WebSocketMessage, Error = WebSocketError>>,
 58            Box<
 59                dyn Send + Unpin + futures::Stream<Item = Result<WebSocketMessage, WebSocketError>>,
 60            >,
 61        ) {
 62            use futures::channel::mpsc;
 63            use std::io::{Error, ErrorKind};
 64
 65            let (tx, rx) = mpsc::unbounded::<WebSocketMessage>();
 66
 67            let tx = tx
 68                .sink_map_err(|e| WebSocketError::from(Error::new(ErrorKind::Other, e)))
 69                .with({
 70                    let killed = killed.clone();
 71                    let executor = Arc::downgrade(&executor);
 72                    move |msg| {
 73                        let killed = killed.clone();
 74                        let executor = executor.clone();
 75                        Box::pin(async move {
 76                            if let Some(executor) = executor.upgrade() {
 77                                executor.simulate_random_delay().await;
 78                            }
 79
 80                            // Writes to a half-open TCP connection will error.
 81                            if killed.load(SeqCst) {
 82                                std::io::Result::Err(
 83                                    Error::new(ErrorKind::Other, "connection lost").into(),
 84                                )?;
 85                            }
 86
 87                            Ok(msg)
 88                        })
 89                    }
 90                });
 91
 92            let rx = rx.then({
 93                let killed = killed.clone();
 94                let executor = Arc::downgrade(&executor);
 95                move |msg| {
 96                    let killed = killed.clone();
 97                    let executor = executor.clone();
 98                    Box::pin(async move {
 99                        if let Some(executor) = executor.upgrade() {
100                            executor.simulate_random_delay().await;
101                        }
102
103                        // Reads from a half-open TCP connection will hang.
104                        if killed.load(SeqCst) {
105                            futures::future::pending::<()>().await;
106                        }
107
108                        Ok(msg)
109                    })
110                }
111            });
112
113            (Box::new(tx), Box::new(rx))
114        }
115    }
116}