1use super::{
2 proto::{self, AnyTypedEnvelope, EnvelopedMessage, MessageStream, RequestMessage},
3 Connection,
4};
5use anyhow::{anyhow, Context, Result};
6use collections::HashMap;
7use futures::{
8 channel::{mpsc, oneshot},
9 stream::BoxStream,
10 FutureExt, SinkExt, StreamExt,
11};
12use parking_lot::{Mutex, RwLock};
13use serde::{ser::SerializeStruct, Serialize};
14use std::sync::atomic::Ordering::SeqCst;
15use std::{
16 fmt,
17 future::Future,
18 marker::PhantomData,
19 sync::{
20 atomic::{self, AtomicU32},
21 Arc,
22 },
23 time::Duration,
24};
25use tracing::instrument;
26
27#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Serialize)]
28pub struct ConnectionId(pub u32);
29
30impl fmt::Display for ConnectionId {
31 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
32 self.0.fmt(f)
33 }
34}
35
36#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
37pub struct PeerId(pub u32);
38
39impl fmt::Display for PeerId {
40 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
41 self.0.fmt(f)
42 }
43}
44
45pub struct Receipt<T> {
46 pub sender_id: ConnectionId,
47 pub message_id: u32,
48 payload_type: PhantomData<T>,
49}
50
51impl<T> Clone for Receipt<T> {
52 fn clone(&self) -> Self {
53 Self {
54 sender_id: self.sender_id,
55 message_id: self.message_id,
56 payload_type: PhantomData,
57 }
58 }
59}
60
61impl<T> Copy for Receipt<T> {}
62
63pub struct TypedEnvelope<T> {
64 pub sender_id: ConnectionId,
65 pub original_sender_id: Option<PeerId>,
66 pub message_id: u32,
67 pub payload: T,
68}
69
70impl<T> TypedEnvelope<T> {
71 pub fn original_sender_id(&self) -> Result<PeerId> {
72 self.original_sender_id
73 .ok_or_else(|| anyhow!("missing original_sender_id"))
74 }
75}
76
77impl<T: RequestMessage> TypedEnvelope<T> {
78 pub fn receipt(&self) -> Receipt<T> {
79 Receipt {
80 sender_id: self.sender_id,
81 message_id: self.message_id,
82 payload_type: PhantomData,
83 }
84 }
85}
86
87pub struct Peer {
88 pub connections: RwLock<HashMap<ConnectionId, ConnectionState>>,
89 next_connection_id: AtomicU32,
90}
91
92#[derive(Clone, Serialize)]
93pub struct ConnectionState {
94 #[serde(skip)]
95 outgoing_tx: mpsc::UnboundedSender<proto::Message>,
96 next_message_id: Arc<AtomicU32>,
97 #[serde(skip)]
98 response_channels:
99 Arc<Mutex<Option<HashMap<u32, oneshot::Sender<(proto::Envelope, oneshot::Sender<()>)>>>>>,
100}
101
102const KEEPALIVE_INTERVAL: Duration = Duration::from_secs(1);
103const WRITE_TIMEOUT: Duration = Duration::from_secs(2);
104pub const RECEIVE_TIMEOUT: Duration = Duration::from_secs(5);
105
106impl Peer {
107 pub fn new() -> Arc<Self> {
108 Arc::new(Self {
109 connections: Default::default(),
110 next_connection_id: Default::default(),
111 })
112 }
113
114 #[instrument(skip_all)]
115 pub async fn add_connection<F, Fut, Out>(
116 self: &Arc<Self>,
117 connection: Connection,
118 create_timer: F,
119 ) -> (
120 ConnectionId,
121 impl Future<Output = anyhow::Result<()>> + Send,
122 BoxStream<'static, Box<dyn AnyTypedEnvelope>>,
123 )
124 where
125 F: Send + Fn(Duration) -> Fut,
126 Fut: Send + Future<Output = Out>,
127 Out: Send,
128 {
129 // For outgoing messages, use an unbounded channel so that application code
130 // can always send messages without yielding. For incoming messages, use a
131 // bounded channel so that other peers will receive backpressure if they send
132 // messages faster than this peer can process them.
133 #[cfg(any(test, feature = "test-support"))]
134 const INCOMING_BUFFER_SIZE: usize = 1;
135 #[cfg(not(any(test, feature = "test-support")))]
136 const INCOMING_BUFFER_SIZE: usize = 64;
137 let (mut incoming_tx, incoming_rx) = mpsc::channel(INCOMING_BUFFER_SIZE);
138 let (outgoing_tx, mut outgoing_rx) = mpsc::unbounded();
139
140 let connection_id = ConnectionId(self.next_connection_id.fetch_add(1, SeqCst));
141 let connection_state = ConnectionState {
142 outgoing_tx: outgoing_tx.clone(),
143 next_message_id: Default::default(),
144 response_channels: Arc::new(Mutex::new(Some(Default::default()))),
145 };
146 let mut writer = MessageStream::new(connection.tx);
147 let mut reader = MessageStream::new(connection.rx);
148
149 let this = self.clone();
150 let response_channels = connection_state.response_channels.clone();
151 let handle_io = async move {
152 tracing::debug!(%connection_id, "handle io future: start");
153
154 let _end_connection = util::defer(|| {
155 response_channels.lock().take();
156 this.connections.write().remove(&connection_id);
157 tracing::debug!(%connection_id, "handle io future: end");
158 });
159
160 // Send messages on this frequency so the connection isn't closed.
161 let keepalive_timer = create_timer(KEEPALIVE_INTERVAL).fuse();
162 futures::pin_mut!(keepalive_timer);
163
164 // Disconnect if we don't receive messages at least this frequently.
165 let receive_timeout = create_timer(RECEIVE_TIMEOUT).fuse();
166 futures::pin_mut!(receive_timeout);
167
168 loop {
169 tracing::debug!(%connection_id, "outer loop iteration start");
170 let read_message = reader.read().fuse();
171 futures::pin_mut!(read_message);
172
173 loop {
174 tracing::debug!(%connection_id, "inner loop iteration start");
175 futures::select_biased! {
176 outgoing = outgoing_rx.next().fuse() => match outgoing {
177 Some(outgoing) => {
178 tracing::debug!(%connection_id, "outgoing rpc message: writing");
179 futures::select_biased! {
180 result = writer.write(outgoing).fuse() => {
181 tracing::debug!(%connection_id, "outgoing rpc message: done writing");
182 result.context("failed to write RPC message")?;
183 tracing::debug!(%connection_id, "keepalive interval: resetting after sending message");
184 keepalive_timer.set(create_timer(KEEPALIVE_INTERVAL).fuse());
185 }
186 _ = create_timer(WRITE_TIMEOUT).fuse() => {
187 tracing::debug!(%connection_id, "outgoing rpc message: writing timed out");
188 Err(anyhow!("timed out writing message"))?;
189 }
190 }
191 }
192 None => {
193 tracing::debug!(%connection_id, "outgoing rpc message: channel closed");
194 return Ok(())
195 },
196 },
197 incoming = read_message => {
198 let incoming = incoming.context("error reading rpc message from socket")?;
199 tracing::debug!(%connection_id, "incoming rpc message: received");
200 tracing::debug!(%connection_id, "receive timeout: resetting");
201 receive_timeout.set(create_timer(RECEIVE_TIMEOUT).fuse());
202 if let proto::Message::Envelope(incoming) = incoming {
203 tracing::debug!(%connection_id, "incoming rpc message: processing");
204 futures::select_biased! {
205 result = incoming_tx.send(incoming).fuse() => match result {
206 Ok(_) => {
207 tracing::debug!(%connection_id, "incoming rpc message: processed");
208 }
209 Err(_) => {
210 tracing::debug!(%connection_id, "incoming rpc message: channel closed");
211 return Ok(())
212 }
213 },
214 _ = create_timer(WRITE_TIMEOUT).fuse() => {
215 tracing::debug!(%connection_id, "incoming rpc message: processing timed out");
216 Err(anyhow!("timed out processing incoming message"))?
217 }
218 }
219 }
220 break;
221 },
222 _ = keepalive_timer => {
223 tracing::debug!(%connection_id, "keepalive interval: pinging");
224 futures::select_biased! {
225 result = writer.write(proto::Message::Ping).fuse() => {
226 tracing::debug!(%connection_id, "keepalive interval: done pinging");
227 result.context("failed to send keepalive")?;
228 tracing::debug!(%connection_id, "keepalive interval: resetting after pinging");
229 keepalive_timer.set(create_timer(KEEPALIVE_INTERVAL).fuse());
230 }
231 _ = create_timer(WRITE_TIMEOUT).fuse() => {
232 tracing::debug!(%connection_id, "keepalive interval: pinging timed out");
233 Err(anyhow!("timed out sending keepalive"))?;
234 }
235 }
236 }
237 _ = receive_timeout => {
238 tracing::debug!(%connection_id, "receive timeout: delay between messages too long");
239 Err(anyhow!("delay between messages too long"))?
240 }
241 }
242 }
243 }
244 };
245
246 let response_channels = connection_state.response_channels.clone();
247 self.connections
248 .write()
249 .insert(connection_id, connection_state);
250
251 let incoming_rx = incoming_rx.filter_map(move |incoming| {
252 let response_channels = response_channels.clone();
253 async move {
254 let message_id = incoming.id;
255 tracing::debug!(?incoming, "incoming message future: start");
256 let _end = util::defer(move || {
257 tracing::debug!(
258 %connection_id,
259 message_id,
260 "incoming message future: end"
261 );
262 });
263
264 if let Some(responding_to) = incoming.responding_to {
265 tracing::debug!(
266 %connection_id,
267 message_id,
268 responding_to,
269 "incoming response: received"
270 );
271 let channel = response_channels.lock().as_mut()?.remove(&responding_to);
272 if let Some(tx) = channel {
273 let requester_resumed = oneshot::channel();
274 if let Err(error) = tx.send((incoming, requester_resumed.0)) {
275 tracing::debug!(
276 %connection_id,
277 message_id,
278 responding_to = responding_to,
279 ?error,
280 "incoming response: request future dropped",
281 );
282 }
283
284 tracing::debug!(
285 %connection_id,
286 message_id,
287 responding_to,
288 "incoming response: waiting to resume requester"
289 );
290 let _ = requester_resumed.1.await;
291 tracing::debug!(
292 %connection_id,
293 message_id,
294 responding_to,
295 "incoming response: requester resumed"
296 );
297 } else {
298 tracing::warn!(
299 %connection_id,
300 message_id,
301 responding_to,
302 "incoming response: unknown request"
303 );
304 }
305
306 None
307 } else {
308 tracing::debug!(
309 %connection_id,
310 message_id,
311 "incoming message: received"
312 );
313 proto::build_typed_envelope(connection_id, incoming).or_else(|| {
314 tracing::error!(
315 %connection_id,
316 message_id,
317 "unable to construct a typed envelope"
318 );
319 None
320 })
321 }
322 }
323 });
324 (connection_id, handle_io, incoming_rx.boxed())
325 }
326
327 #[cfg(any(test, feature = "test-support"))]
328 pub async fn add_test_connection(
329 self: &Arc<Self>,
330 connection: Connection,
331 executor: Arc<gpui::executor::Background>,
332 ) -> (
333 ConnectionId,
334 impl Future<Output = anyhow::Result<()>> + Send,
335 BoxStream<'static, Box<dyn AnyTypedEnvelope>>,
336 ) {
337 let executor = executor.clone();
338 self.add_connection(connection, move |duration| executor.timer(duration))
339 .await
340 }
341
342 pub fn disconnect(&self, connection_id: ConnectionId) {
343 self.connections.write().remove(&connection_id);
344 }
345
346 pub fn reset(&self) {
347 self.connections.write().clear();
348 }
349
350 pub fn request<T: RequestMessage>(
351 &self,
352 receiver_id: ConnectionId,
353 request: T,
354 ) -> impl Future<Output = Result<T::Response>> {
355 self.request_internal(None, receiver_id, request)
356 }
357
358 pub fn forward_request<T: RequestMessage>(
359 &self,
360 sender_id: ConnectionId,
361 receiver_id: ConnectionId,
362 request: T,
363 ) -> impl Future<Output = Result<T::Response>> {
364 self.request_internal(Some(sender_id), receiver_id, request)
365 }
366
367 pub fn request_internal<T: RequestMessage>(
368 &self,
369 original_sender_id: Option<ConnectionId>,
370 receiver_id: ConnectionId,
371 request: T,
372 ) -> impl Future<Output = Result<T::Response>> {
373 let (tx, rx) = oneshot::channel();
374 let send = self.connection_state(receiver_id).and_then(|connection| {
375 let message_id = connection.next_message_id.fetch_add(1, SeqCst);
376 connection
377 .response_channels
378 .lock()
379 .as_mut()
380 .ok_or_else(|| anyhow!("connection was closed"))?
381 .insert(message_id, tx);
382 connection
383 .outgoing_tx
384 .unbounded_send(proto::Message::Envelope(request.into_envelope(
385 message_id,
386 None,
387 original_sender_id.map(|id| id.0),
388 )))
389 .map_err(|_| anyhow!("connection was closed"))?;
390 Ok(())
391 });
392 async move {
393 send?;
394 let (response, _barrier) = rx.await.map_err(|_| anyhow!("connection was closed"))?;
395 if let Some(proto::envelope::Payload::Error(error)) = &response.payload {
396 Err(anyhow!("RPC request failed - {}", error.message))
397 } else {
398 T::Response::from_envelope(response)
399 .ok_or_else(|| anyhow!("received response of the wrong type"))
400 }
401 }
402 }
403
404 pub fn send<T: EnvelopedMessage>(&self, receiver_id: ConnectionId, message: T) -> Result<()> {
405 let connection = self.connection_state(receiver_id)?;
406 let message_id = connection
407 .next_message_id
408 .fetch_add(1, atomic::Ordering::SeqCst);
409 connection
410 .outgoing_tx
411 .unbounded_send(proto::Message::Envelope(
412 message.into_envelope(message_id, None, None),
413 ))?;
414 Ok(())
415 }
416
417 pub fn forward_send<T: EnvelopedMessage>(
418 &self,
419 sender_id: ConnectionId,
420 receiver_id: ConnectionId,
421 message: T,
422 ) -> Result<()> {
423 let connection = self.connection_state(receiver_id)?;
424 let message_id = connection
425 .next_message_id
426 .fetch_add(1, atomic::Ordering::SeqCst);
427 connection
428 .outgoing_tx
429 .unbounded_send(proto::Message::Envelope(message.into_envelope(
430 message_id,
431 None,
432 Some(sender_id.0),
433 )))?;
434 Ok(())
435 }
436
437 pub fn respond<T: RequestMessage>(
438 &self,
439 receipt: Receipt<T>,
440 response: T::Response,
441 ) -> Result<()> {
442 let connection = self.connection_state(receipt.sender_id)?;
443 let message_id = connection
444 .next_message_id
445 .fetch_add(1, atomic::Ordering::SeqCst);
446 connection
447 .outgoing_tx
448 .unbounded_send(proto::Message::Envelope(response.into_envelope(
449 message_id,
450 Some(receipt.message_id),
451 None,
452 )))?;
453 Ok(())
454 }
455
456 pub fn respond_with_error<T: RequestMessage>(
457 &self,
458 receipt: Receipt<T>,
459 response: proto::Error,
460 ) -> Result<()> {
461 let connection = self.connection_state(receipt.sender_id)?;
462 let message_id = connection
463 .next_message_id
464 .fetch_add(1, atomic::Ordering::SeqCst);
465 connection
466 .outgoing_tx
467 .unbounded_send(proto::Message::Envelope(response.into_envelope(
468 message_id,
469 Some(receipt.message_id),
470 None,
471 )))?;
472 Ok(())
473 }
474
475 fn connection_state(&self, connection_id: ConnectionId) -> Result<ConnectionState> {
476 let connections = self.connections.read();
477 let connection = connections
478 .get(&connection_id)
479 .ok_or_else(|| anyhow!("no such connection: {}", connection_id))?;
480 Ok(connection.clone())
481 }
482}
483
484impl Serialize for Peer {
485 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
486 where
487 S: serde::Serializer,
488 {
489 let mut state = serializer.serialize_struct("Peer", 2)?;
490 state.serialize_field("connections", &*self.connections.read())?;
491 state.end()
492 }
493}
494
495#[cfg(test)]
496mod tests {
497 use super::*;
498 use crate::TypedEnvelope;
499 use async_tungstenite::tungstenite::Message as WebSocketMessage;
500 use gpui::TestAppContext;
501
502 #[gpui::test(iterations = 50)]
503 async fn test_request_response(cx: &mut TestAppContext) {
504 let executor = cx.foreground();
505
506 // create 2 clients connected to 1 server
507 let server = Peer::new();
508 let client1 = Peer::new();
509 let client2 = Peer::new();
510
511 let (client1_to_server_conn, server_to_client_1_conn, _kill) =
512 Connection::in_memory(cx.background());
513 let (client1_conn_id, io_task1, client1_incoming) = client1
514 .add_test_connection(client1_to_server_conn, cx.background())
515 .await;
516 let (_, io_task2, server_incoming1) = server
517 .add_test_connection(server_to_client_1_conn, cx.background())
518 .await;
519
520 let (client2_to_server_conn, server_to_client_2_conn, _kill) =
521 Connection::in_memory(cx.background());
522 let (client2_conn_id, io_task3, client2_incoming) = client2
523 .add_test_connection(client2_to_server_conn, cx.background())
524 .await;
525 let (_, io_task4, server_incoming2) = server
526 .add_test_connection(server_to_client_2_conn, cx.background())
527 .await;
528
529 executor.spawn(io_task1).detach();
530 executor.spawn(io_task2).detach();
531 executor.spawn(io_task3).detach();
532 executor.spawn(io_task4).detach();
533 executor
534 .spawn(handle_messages(server_incoming1, server.clone()))
535 .detach();
536 executor
537 .spawn(handle_messages(client1_incoming, client1.clone()))
538 .detach();
539 executor
540 .spawn(handle_messages(server_incoming2, server.clone()))
541 .detach();
542 executor
543 .spawn(handle_messages(client2_incoming, client2.clone()))
544 .detach();
545
546 assert_eq!(
547 client1
548 .request(client1_conn_id, proto::Ping {},)
549 .await
550 .unwrap(),
551 proto::Ack {}
552 );
553
554 assert_eq!(
555 client2
556 .request(client2_conn_id, proto::Ping {},)
557 .await
558 .unwrap(),
559 proto::Ack {}
560 );
561
562 assert_eq!(
563 client1
564 .request(client1_conn_id, proto::Test { id: 1 },)
565 .await
566 .unwrap(),
567 proto::Test { id: 1 }
568 );
569
570 assert_eq!(
571 client2
572 .request(client2_conn_id, proto::Test { id: 2 })
573 .await
574 .unwrap(),
575 proto::Test { id: 2 }
576 );
577
578 client1.disconnect(client1_conn_id);
579 client2.disconnect(client1_conn_id);
580
581 async fn handle_messages(
582 mut messages: BoxStream<'static, Box<dyn AnyTypedEnvelope>>,
583 peer: Arc<Peer>,
584 ) -> Result<()> {
585 while let Some(envelope) = messages.next().await {
586 let envelope = envelope.into_any();
587 if let Some(envelope) = envelope.downcast_ref::<TypedEnvelope<proto::Ping>>() {
588 let receipt = envelope.receipt();
589 peer.respond(receipt, proto::Ack {})?
590 } else if let Some(envelope) = envelope.downcast_ref::<TypedEnvelope<proto::Test>>()
591 {
592 peer.respond(envelope.receipt(), envelope.payload.clone())?
593 } else {
594 panic!("unknown message type");
595 }
596 }
597
598 Ok(())
599 }
600 }
601
602 #[gpui::test(iterations = 50)]
603 async fn test_order_of_response_and_incoming(cx: &mut TestAppContext) {
604 let executor = cx.foreground();
605 let server = Peer::new();
606 let client = Peer::new();
607
608 let (client_to_server_conn, server_to_client_conn, _kill) =
609 Connection::in_memory(cx.background());
610 let (client_to_server_conn_id, io_task1, mut client_incoming) = client
611 .add_test_connection(client_to_server_conn, cx.background())
612 .await;
613 let (server_to_client_conn_id, io_task2, mut server_incoming) = server
614 .add_test_connection(server_to_client_conn, cx.background())
615 .await;
616
617 executor.spawn(io_task1).detach();
618 executor.spawn(io_task2).detach();
619
620 executor
621 .spawn(async move {
622 let request = server_incoming
623 .next()
624 .await
625 .unwrap()
626 .into_any()
627 .downcast::<TypedEnvelope<proto::Ping>>()
628 .unwrap();
629
630 server
631 .send(
632 server_to_client_conn_id,
633 proto::Error {
634 message: "message 1".to_string(),
635 },
636 )
637 .unwrap();
638 server
639 .send(
640 server_to_client_conn_id,
641 proto::Error {
642 message: "message 2".to_string(),
643 },
644 )
645 .unwrap();
646 server.respond(request.receipt(), proto::Ack {}).unwrap();
647
648 // Prevent the connection from being dropped
649 server_incoming.next().await;
650 })
651 .detach();
652
653 let events = Arc::new(Mutex::new(Vec::new()));
654
655 let response = client.request(client_to_server_conn_id, proto::Ping {});
656 let response_task = executor.spawn({
657 let events = events.clone();
658 async move {
659 response.await.unwrap();
660 events.lock().push("response".to_string());
661 }
662 });
663
664 executor
665 .spawn({
666 let events = events.clone();
667 async move {
668 let incoming1 = client_incoming
669 .next()
670 .await
671 .unwrap()
672 .into_any()
673 .downcast::<TypedEnvelope<proto::Error>>()
674 .unwrap();
675 events.lock().push(incoming1.payload.message);
676 let incoming2 = client_incoming
677 .next()
678 .await
679 .unwrap()
680 .into_any()
681 .downcast::<TypedEnvelope<proto::Error>>()
682 .unwrap();
683 events.lock().push(incoming2.payload.message);
684
685 // Prevent the connection from being dropped
686 client_incoming.next().await;
687 }
688 })
689 .detach();
690
691 response_task.await;
692 assert_eq!(
693 &*events.lock(),
694 &[
695 "message 1".to_string(),
696 "message 2".to_string(),
697 "response".to_string()
698 ]
699 );
700 }
701
702 #[gpui::test(iterations = 50)]
703 async fn test_dropping_request_before_completion(cx: &mut TestAppContext) {
704 let executor = cx.foreground();
705 let server = Peer::new();
706 let client = Peer::new();
707
708 let (client_to_server_conn, server_to_client_conn, _kill) =
709 Connection::in_memory(cx.background());
710 let (client_to_server_conn_id, io_task1, mut client_incoming) = client
711 .add_test_connection(client_to_server_conn, cx.background())
712 .await;
713 let (server_to_client_conn_id, io_task2, mut server_incoming) = server
714 .add_test_connection(server_to_client_conn, cx.background())
715 .await;
716
717 executor.spawn(io_task1).detach();
718 executor.spawn(io_task2).detach();
719
720 executor
721 .spawn(async move {
722 let request1 = server_incoming
723 .next()
724 .await
725 .unwrap()
726 .into_any()
727 .downcast::<TypedEnvelope<proto::Ping>>()
728 .unwrap();
729 let request2 = server_incoming
730 .next()
731 .await
732 .unwrap()
733 .into_any()
734 .downcast::<TypedEnvelope<proto::Ping>>()
735 .unwrap();
736
737 server
738 .send(
739 server_to_client_conn_id,
740 proto::Error {
741 message: "message 1".to_string(),
742 },
743 )
744 .unwrap();
745 server
746 .send(
747 server_to_client_conn_id,
748 proto::Error {
749 message: "message 2".to_string(),
750 },
751 )
752 .unwrap();
753 server.respond(request1.receipt(), proto::Ack {}).unwrap();
754 server.respond(request2.receipt(), proto::Ack {}).unwrap();
755
756 // Prevent the connection from being dropped
757 server_incoming.next().await;
758 })
759 .detach();
760
761 let events = Arc::new(Mutex::new(Vec::new()));
762
763 let request1 = client.request(client_to_server_conn_id, proto::Ping {});
764 let request1_task = executor.spawn(request1);
765 let request2 = client.request(client_to_server_conn_id, proto::Ping {});
766 let request2_task = executor.spawn({
767 let events = events.clone();
768 async move {
769 request2.await.unwrap();
770 events.lock().push("response 2".to_string());
771 }
772 });
773
774 executor
775 .spawn({
776 let events = events.clone();
777 async move {
778 let incoming1 = client_incoming
779 .next()
780 .await
781 .unwrap()
782 .into_any()
783 .downcast::<TypedEnvelope<proto::Error>>()
784 .unwrap();
785 events.lock().push(incoming1.payload.message);
786 let incoming2 = client_incoming
787 .next()
788 .await
789 .unwrap()
790 .into_any()
791 .downcast::<TypedEnvelope<proto::Error>>()
792 .unwrap();
793 events.lock().push(incoming2.payload.message);
794
795 // Prevent the connection from being dropped
796 client_incoming.next().await;
797 }
798 })
799 .detach();
800
801 // Allow the request to make some progress before dropping it.
802 cx.background().simulate_random_delay().await;
803 drop(request1_task);
804
805 request2_task.await;
806 assert_eq!(
807 &*events.lock(),
808 &[
809 "message 1".to_string(),
810 "message 2".to_string(),
811 "response 2".to_string()
812 ]
813 );
814 }
815
816 #[gpui::test(iterations = 50)]
817 async fn test_disconnect(cx: &mut TestAppContext) {
818 let executor = cx.foreground();
819
820 let (client_conn, mut server_conn, _kill) = Connection::in_memory(cx.background());
821
822 let client = Peer::new();
823 let (connection_id, io_handler, mut incoming) = client
824 .add_test_connection(client_conn, cx.background())
825 .await;
826
827 let (io_ended_tx, io_ended_rx) = oneshot::channel();
828 executor
829 .spawn(async move {
830 io_handler.await.ok();
831 io_ended_tx.send(()).unwrap();
832 })
833 .detach();
834
835 let (messages_ended_tx, messages_ended_rx) = oneshot::channel();
836 executor
837 .spawn(async move {
838 incoming.next().await;
839 messages_ended_tx.send(()).unwrap();
840 })
841 .detach();
842
843 client.disconnect(connection_id);
844
845 let _ = io_ended_rx.await;
846 let _ = messages_ended_rx.await;
847 assert!(server_conn
848 .send(WebSocketMessage::Binary(vec![]))
849 .await
850 .is_err());
851 }
852
853 #[gpui::test(iterations = 50)]
854 async fn test_io_error(cx: &mut TestAppContext) {
855 let executor = cx.foreground();
856 let (client_conn, mut server_conn, _kill) = Connection::in_memory(cx.background());
857
858 let client = Peer::new();
859 let (connection_id, io_handler, mut incoming) = client
860 .add_test_connection(client_conn, cx.background())
861 .await;
862 executor.spawn(io_handler).detach();
863 executor
864 .spawn(async move { incoming.next().await })
865 .detach();
866
867 let response = executor.spawn(client.request(connection_id, proto::Ping {}));
868 let _request = server_conn.rx.next().await.unwrap().unwrap();
869
870 drop(server_conn);
871 assert_eq!(
872 response.await.unwrap_err().to_string(),
873 "connection was closed"
874 );
875 }
876}