1use super::{
2 Connection,
3 message_stream::{Message, MessageStream},
4 proto::{
5 self, AnyTypedEnvelope, EnvelopedMessage, PeerId, Receipt, RequestMessage, TypedEnvelope,
6 },
7};
8use anyhow::{Context as _, Result, anyhow};
9use collections::HashMap;
10use futures::{
11 FutureExt, SinkExt, Stream, StreamExt, TryFutureExt,
12 channel::{mpsc, oneshot},
13 stream::BoxStream,
14};
15use parking_lot::{Mutex, RwLock};
16use proto::{ErrorCode, ErrorCodeExt, ErrorExt, RpcError};
17use serde::{Serialize, ser::SerializeStruct};
18use std::{
19 fmt, future,
20 future::Future,
21 sync::atomic::Ordering::SeqCst,
22 sync::{
23 Arc,
24 atomic::{self, AtomicU32},
25 },
26 time::Duration,
27 time::Instant,
28};
29use tracing::instrument;
30
31#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Serialize)]
32pub struct ConnectionId {
33 pub owner_id: u32,
34 pub id: u32,
35}
36
37impl From<ConnectionId> for PeerId {
38 fn from(id: ConnectionId) -> Self {
39 PeerId {
40 owner_id: id.owner_id,
41 id: id.id,
42 }
43 }
44}
45
46impl From<PeerId> for ConnectionId {
47 fn from(peer_id: PeerId) -> Self {
48 Self {
49 owner_id: peer_id.owner_id,
50 id: peer_id.id,
51 }
52 }
53}
54
55impl fmt::Display for ConnectionId {
56 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
57 write!(f, "{}/{}", self.owner_id, self.id)
58 }
59}
60
61pub struct Peer {
62 epoch: AtomicU32,
63 pub connections: RwLock<HashMap<ConnectionId, ConnectionState>>,
64 next_connection_id: AtomicU32,
65}
66
67#[derive(Clone, Serialize)]
68pub struct ConnectionState {
69 #[serde(skip)]
70 outgoing_tx: mpsc::UnboundedSender<Message>,
71 next_message_id: Arc<AtomicU32>,
72 #[allow(clippy::type_complexity)]
73 #[serde(skip)]
74 response_channels: Arc<
75 Mutex<
76 Option<
77 HashMap<
78 u32,
79 oneshot::Sender<(proto::Envelope, std::time::Instant, oneshot::Sender<()>)>,
80 >,
81 >,
82 >,
83 >,
84 #[allow(clippy::type_complexity)]
85 #[serde(skip)]
86 stream_response_channels: Arc<
87 Mutex<
88 Option<
89 HashMap<u32, mpsc::UnboundedSender<(Result<proto::Envelope>, oneshot::Sender<()>)>>,
90 >,
91 >,
92 >,
93}
94
95const KEEPALIVE_INTERVAL: Duration = Duration::from_secs(1);
96const WRITE_TIMEOUT: Duration = Duration::from_secs(2);
97pub const RECEIVE_TIMEOUT: Duration = Duration::from_secs(10);
98
99impl Peer {
100 pub fn new(epoch: u32) -> Arc<Self> {
101 Arc::new(Self {
102 epoch: AtomicU32::new(epoch),
103 connections: Default::default(),
104 next_connection_id: Default::default(),
105 })
106 }
107
108 pub fn epoch(&self) -> u32 {
109 self.epoch.load(SeqCst)
110 }
111
112 #[instrument(skip_all)]
113 pub fn add_connection<F, Fut, Out>(
114 self: &Arc<Self>,
115 connection: Connection,
116 create_timer: F,
117 ) -> (
118 ConnectionId,
119 impl Future<Output = anyhow::Result<()>> + Send + use<F, Fut, Out>,
120 BoxStream<'static, Box<dyn AnyTypedEnvelope>>,
121 )
122 where
123 F: Send + Fn(Duration) -> Fut,
124 Fut: Send + Future<Output = Out>,
125 Out: Send,
126 {
127 // For outgoing messages, use an unbounded channel so that application code
128 // can always send messages without yielding. For incoming messages, use a
129 // bounded channel so that other peers will receive backpressure if they send
130 // messages faster than this peer can process them.
131 #[cfg(any(test, feature = "test-support"))]
132 const INCOMING_BUFFER_SIZE: usize = 1;
133 #[cfg(not(any(test, feature = "test-support")))]
134 const INCOMING_BUFFER_SIZE: usize = 256;
135 let (mut incoming_tx, incoming_rx) = mpsc::channel(INCOMING_BUFFER_SIZE);
136 let (outgoing_tx, mut outgoing_rx) = mpsc::unbounded();
137
138 let connection_id = ConnectionId {
139 owner_id: self.epoch.load(SeqCst),
140 id: self.next_connection_id.fetch_add(1, SeqCst),
141 };
142 let connection_state = ConnectionState {
143 outgoing_tx,
144 next_message_id: Default::default(),
145 response_channels: Arc::new(Mutex::new(Some(Default::default()))),
146 stream_response_channels: Arc::new(Mutex::new(Some(Default::default()))),
147 };
148 let mut writer = MessageStream::new(connection.tx);
149 let mut reader = MessageStream::new(connection.rx);
150
151 let this = self.clone();
152 let response_channels = connection_state.response_channels.clone();
153 let stream_response_channels = connection_state.stream_response_channels.clone();
154
155 let handle_io = async move {
156 tracing::trace!(%connection_id, "handle io future: start");
157
158 let _end_connection = util::defer(|| {
159 response_channels.lock().take();
160 if let Some(channels) = stream_response_channels.lock().take() {
161 for channel in channels.values() {
162 let _ = channel.unbounded_send((
163 Err(anyhow!("connection closed")),
164 oneshot::channel().0,
165 ));
166 }
167 }
168 this.connections.write().remove(&connection_id);
169 tracing::trace!(%connection_id, "handle io future: end");
170 });
171
172 // Send messages on this frequency so the connection isn't closed.
173 let keepalive_timer = create_timer(KEEPALIVE_INTERVAL).fuse();
174 futures::pin_mut!(keepalive_timer);
175
176 // Disconnect if we don't receive messages at least this frequently.
177 let receive_timeout = create_timer(RECEIVE_TIMEOUT).fuse();
178 futures::pin_mut!(receive_timeout);
179
180 loop {
181 tracing::trace!(%connection_id, "outer loop iteration start");
182 let read_message = reader.read().fuse();
183 futures::pin_mut!(read_message);
184
185 loop {
186 tracing::trace!(%connection_id, "inner loop iteration start");
187 futures::select_biased! {
188 outgoing = outgoing_rx.next().fuse() => match outgoing {
189 Some(outgoing) => {
190 tracing::trace!(%connection_id, "outgoing rpc message: writing");
191 futures::select_biased! {
192 result = writer.write(outgoing).fuse() => {
193 tracing::trace!(%connection_id, "outgoing rpc message: done writing");
194 result.context("failed to write RPC message")?;
195 tracing::trace!(%connection_id, "keepalive interval: resetting after sending message");
196 keepalive_timer.set(create_timer(KEEPALIVE_INTERVAL).fuse());
197 }
198 _ = create_timer(WRITE_TIMEOUT).fuse() => {
199 tracing::trace!(%connection_id, "outgoing rpc message: writing timed out");
200 anyhow::bail!("timed out writing message");
201 }
202 }
203 }
204 None => {
205 tracing::trace!(%connection_id, "outgoing rpc message: channel closed");
206 return Ok(())
207 },
208 },
209 _ = keepalive_timer => {
210 tracing::trace!(%connection_id, "keepalive interval: pinging");
211 futures::select_biased! {
212 result = writer.write(Message::Ping).fuse() => {
213 tracing::trace!(%connection_id, "keepalive interval: done pinging");
214 result.context("failed to send keepalive")?;
215 tracing::trace!(%connection_id, "keepalive interval: resetting after pinging");
216 keepalive_timer.set(create_timer(KEEPALIVE_INTERVAL).fuse());
217 }
218 _ = create_timer(WRITE_TIMEOUT).fuse() => {
219 tracing::trace!(%connection_id, "keepalive interval: pinging timed out");
220 anyhow::bail!("timed out sending keepalive");
221 }
222 }
223 }
224 incoming = read_message => {
225 let incoming = incoming.context("error reading rpc message from socket")?;
226 tracing::trace!(%connection_id, "incoming rpc message: received");
227 tracing::trace!(%connection_id, "receive timeout: resetting");
228 receive_timeout.set(create_timer(RECEIVE_TIMEOUT).fuse());
229 if let (Message::Envelope(incoming), received_at) = incoming {
230 tracing::trace!(%connection_id, "incoming rpc message: processing");
231 futures::select_biased! {
232 result = incoming_tx.send((incoming, received_at)).fuse() => match result {
233 Ok(_) => {
234 tracing::trace!(%connection_id, "incoming rpc message: processed");
235 }
236 Err(_) => {
237 tracing::trace!(%connection_id, "incoming rpc message: channel closed");
238 return Ok(())
239 }
240 },
241 _ = create_timer(WRITE_TIMEOUT).fuse() => {
242 tracing::trace!(%connection_id, "incoming rpc message: processing timed out");
243 anyhow::bail!("timed out processing incoming message");
244 }
245 }
246 }
247 break;
248 },
249 _ = receive_timeout => {
250 tracing::trace!(%connection_id, "receive timeout: delay between messages too long");
251 anyhow::bail!("delay between messages too long");
252 }
253 }
254 }
255 }
256 };
257
258 let response_channels = connection_state.response_channels.clone();
259 let stream_response_channels = connection_state.stream_response_channels.clone();
260 self.connections
261 .write()
262 .insert(connection_id, connection_state);
263
264 let incoming_rx = incoming_rx.filter_map(move |(incoming, received_at)| {
265 let response_channels = response_channels.clone();
266 let stream_response_channels = stream_response_channels.clone();
267 async move {
268 let message_id = incoming.id;
269 tracing::trace!(?incoming, "incoming message future: start");
270 let _end = util::defer(move || {
271 tracing::trace!(%connection_id, message_id, "incoming message future: end");
272 });
273
274 if let Some(responding_to) = incoming.responding_to {
275 tracing::trace!(
276 %connection_id,
277 message_id,
278 responding_to,
279 "incoming response: received"
280 );
281 let response_channel =
282 response_channels.lock().as_mut()?.remove(&responding_to);
283 let stream_response_channel = stream_response_channels
284 .lock()
285 .as_ref()?
286 .get(&responding_to)
287 .cloned();
288
289 if let Some(tx) = response_channel {
290 let requester_resumed = oneshot::channel();
291 if let Err(error) = tx.send((incoming, received_at, requester_resumed.0)) {
292 tracing::trace!(
293 %connection_id,
294 message_id,
295 responding_to = responding_to,
296 ?error,
297 "incoming response: request future dropped",
298 );
299 }
300
301 tracing::trace!(
302 %connection_id,
303 message_id,
304 responding_to,
305 "incoming response: waiting to resume requester"
306 );
307 let _ = requester_resumed.1.await;
308 tracing::trace!(
309 %connection_id,
310 message_id,
311 responding_to,
312 "incoming response: requester resumed"
313 );
314 } else if let Some(tx) = stream_response_channel {
315 let requester_resumed = oneshot::channel();
316 if let Err(error) = tx.unbounded_send((Ok(incoming), requester_resumed.0)) {
317 tracing::debug!(
318 %connection_id,
319 message_id,
320 responding_to = responding_to,
321 ?error,
322 "incoming stream response: request future dropped",
323 );
324 }
325
326 tracing::debug!(
327 %connection_id,
328 message_id,
329 responding_to,
330 "incoming stream response: waiting to resume requester"
331 );
332 let _ = requester_resumed.1.await;
333 tracing::debug!(
334 %connection_id,
335 message_id,
336 responding_to,
337 "incoming stream response: requester resumed"
338 );
339 } else {
340 let message_type = proto::build_typed_envelope(
341 connection_id.into(),
342 received_at,
343 incoming,
344 )
345 .map(|p| p.payload_type_name());
346 tracing::warn!(
347 %connection_id,
348 message_id,
349 responding_to,
350 message_type,
351 "incoming response: unknown request"
352 );
353 }
354
355 None
356 } else {
357 tracing::trace!(%connection_id, message_id, "incoming message: received");
358 proto::build_typed_envelope(connection_id.into(), received_at, incoming)
359 .or_else(|| {
360 tracing::error!(
361 %connection_id,
362 message_id,
363 "unable to construct a typed envelope"
364 );
365 None
366 })
367 }
368 }
369 });
370 (connection_id, handle_io, incoming_rx.boxed())
371 }
372
373 #[cfg(any(test, feature = "test-support"))]
374 pub fn add_test_connection(
375 self: &Arc<Self>,
376 connection: Connection,
377 executor: gpui::BackgroundExecutor,
378 ) -> (
379 ConnectionId,
380 impl Future<Output = anyhow::Result<()>> + Send + use<>,
381 BoxStream<'static, Box<dyn AnyTypedEnvelope>>,
382 ) {
383 let executor = executor.clone();
384 self.add_connection(connection, move |duration| executor.timer(duration))
385 }
386
387 pub fn disconnect(&self, connection_id: ConnectionId) {
388 self.connections.write().remove(&connection_id);
389 }
390
391 #[cfg(any(test, feature = "test-support"))]
392 pub fn reset(&self, epoch: u32) {
393 self.next_connection_id.store(0, SeqCst);
394 self.epoch.store(epoch, SeqCst);
395 }
396
397 pub fn teardown(&self) {
398 self.connections.write().clear();
399 }
400
401 /// Make a request and wait for a response.
402 pub fn request<T: RequestMessage>(
403 &self,
404 receiver_id: ConnectionId,
405 request: T,
406 ) -> impl Future<Output = Result<T::Response>> + use<T> {
407 self.request_internal(None, receiver_id, request)
408 .map_ok(|envelope| envelope.payload)
409 }
410
411 pub fn request_envelope<T: RequestMessage>(
412 &self,
413 receiver_id: ConnectionId,
414 request: T,
415 ) -> impl Future<Output = Result<TypedEnvelope<T::Response>>> + use<T> {
416 self.request_internal(None, receiver_id, request)
417 }
418
419 pub fn forward_request<T: RequestMessage>(
420 &self,
421 sender_id: ConnectionId,
422 receiver_id: ConnectionId,
423 request: T,
424 ) -> impl Future<Output = Result<T::Response>> {
425 self.request_internal(Some(sender_id), receiver_id, request)
426 .map_ok(|envelope| envelope.payload)
427 }
428
429 fn request_internal<T: RequestMessage>(
430 &self,
431 original_sender_id: Option<ConnectionId>,
432 receiver_id: ConnectionId,
433 request: T,
434 ) -> impl Future<Output = Result<TypedEnvelope<T::Response>>> + use<T> {
435 let envelope = request.into_envelope(0, None, original_sender_id.map(Into::into));
436 let response = self.request_dynamic(receiver_id, envelope, T::NAME);
437 async move {
438 let (response, received_at) = response.await?;
439 Ok(TypedEnvelope {
440 message_id: response.id,
441 sender_id: receiver_id.into(),
442 original_sender_id: response.original_sender_id,
443 payload: T::Response::from_envelope(response)
444 .context("received response of the wrong type")?,
445 received_at,
446 })
447 }
448 }
449
450 /// Make a request and wait for a response.
451 ///
452 /// The caller must make sure to deserialize the response into the request's
453 /// response type. This interface is only useful in trait objects, where
454 /// generics can't be used. If you have a concrete type, use `request`.
455 pub fn request_dynamic(
456 &self,
457 receiver_id: ConnectionId,
458 mut envelope: proto::Envelope,
459 type_name: &'static str,
460 ) -> impl Future<Output = Result<(proto::Envelope, Instant)>> + use<> {
461 let (tx, rx) = oneshot::channel();
462 let send = self.connection_state(receiver_id).and_then(|connection| {
463 envelope.id = connection.next_message_id.fetch_add(1, SeqCst);
464 connection
465 .response_channels
466 .lock()
467 .as_mut()
468 .context("connection was closed")?
469 .insert(envelope.id, tx);
470 connection
471 .outgoing_tx
472 .unbounded_send(Message::Envelope(envelope))
473 .context("connection was closed")?;
474 Ok(())
475 });
476 async move {
477 send?;
478 let (response, received_at, _barrier) = rx.await.context("connection was closed")?;
479 if let Some(proto::envelope::Payload::Error(error)) = &response.payload {
480 return Err(RpcError::from_proto(error, type_name));
481 }
482 Ok((response, received_at))
483 }
484 }
485
486 pub fn request_stream<T: RequestMessage>(
487 &self,
488 receiver_id: ConnectionId,
489 request: T,
490 ) -> impl Future<Output = Result<impl Unpin + Stream<Item = Result<T::Response>>>> {
491 let (tx, rx) = mpsc::unbounded();
492 let send = self.connection_state(receiver_id).and_then(|connection| {
493 let message_id = connection.next_message_id.fetch_add(1, SeqCst);
494 let stream_response_channels = connection.stream_response_channels.clone();
495 stream_response_channels
496 .lock()
497 .as_mut()
498 .context("connection was closed")?
499 .insert(message_id, tx);
500 connection
501 .outgoing_tx
502 .unbounded_send(Message::Envelope(
503 request.into_envelope(message_id, None, None),
504 ))
505 .context("connection was closed")?;
506 Ok((message_id, stream_response_channels))
507 });
508
509 async move {
510 let (message_id, stream_response_channels) = send?;
511 let stream_response_channels = Arc::downgrade(&stream_response_channels);
512
513 Ok(rx.filter_map(move |(response, _barrier)| {
514 let stream_response_channels = stream_response_channels.clone();
515 future::ready(match response {
516 Ok(response) => {
517 if let Some(proto::envelope::Payload::Error(error)) = &response.payload {
518 Some(Err(RpcError::from_proto(error, T::NAME)))
519 } else if let Some(proto::envelope::Payload::EndStream(_)) =
520 &response.payload
521 {
522 // Remove the transmitting end of the response channel to end the stream.
523 if let Some(channels) = stream_response_channels.upgrade()
524 && let Some(channels) = channels.lock().as_mut()
525 {
526 channels.remove(&message_id);
527 }
528 None
529 } else {
530 Some(
531 T::Response::from_envelope(response)
532 .context("received response of the wrong type"),
533 )
534 }
535 }
536 Err(error) => Some(Err(error)),
537 })
538 }))
539 }
540 }
541
542 pub fn send<T: EnvelopedMessage>(&self, receiver_id: ConnectionId, message: T) -> Result<()> {
543 let connection = self.connection_state(receiver_id)?;
544 let message_id = connection
545 .next_message_id
546 .fetch_add(1, atomic::Ordering::SeqCst);
547 connection.outgoing_tx.unbounded_send(Message::Envelope(
548 message.into_envelope(message_id, None, None),
549 ))?;
550 Ok(())
551 }
552
553 pub fn send_dynamic(&self, receiver_id: ConnectionId, message: proto::Envelope) -> Result<()> {
554 let connection = self.connection_state(receiver_id)?;
555 connection
556 .outgoing_tx
557 .unbounded_send(Message::Envelope(message))?;
558 Ok(())
559 }
560
561 pub fn forward_send<T: EnvelopedMessage>(
562 &self,
563 sender_id: ConnectionId,
564 receiver_id: ConnectionId,
565 message: T,
566 ) -> Result<()> {
567 let connection = self.connection_state(receiver_id)?;
568 let message_id = connection
569 .next_message_id
570 .fetch_add(1, atomic::Ordering::SeqCst);
571 connection
572 .outgoing_tx
573 .unbounded_send(Message::Envelope(message.into_envelope(
574 message_id,
575 None,
576 Some(sender_id.into()),
577 )))?;
578 Ok(())
579 }
580
581 pub fn respond<T: RequestMessage>(
582 &self,
583 receipt: Receipt<T>,
584 response: T::Response,
585 ) -> Result<()> {
586 let connection = self.connection_state(receipt.sender_id.into())?;
587 let message_id = connection
588 .next_message_id
589 .fetch_add(1, atomic::Ordering::SeqCst);
590 connection
591 .outgoing_tx
592 .unbounded_send(Message::Envelope(response.into_envelope(
593 message_id,
594 Some(receipt.message_id),
595 None,
596 )))?;
597 Ok(())
598 }
599
600 pub fn end_stream<T: RequestMessage>(&self, receipt: Receipt<T>) -> Result<()> {
601 let connection = self.connection_state(receipt.sender_id.into())?;
602 let message_id = connection
603 .next_message_id
604 .fetch_add(1, atomic::Ordering::SeqCst);
605
606 let message = proto::EndStream {};
607
608 connection
609 .outgoing_tx
610 .unbounded_send(Message::Envelope(message.into_envelope(
611 message_id,
612 Some(receipt.message_id),
613 None,
614 )))?;
615 Ok(())
616 }
617
618 pub fn respond_with_error<T: RequestMessage>(
619 &self,
620 receipt: Receipt<T>,
621 response: proto::Error,
622 ) -> Result<()> {
623 let connection = self.connection_state(receipt.sender_id.into())?;
624 let message_id = connection
625 .next_message_id
626 .fetch_add(1, atomic::Ordering::SeqCst);
627 connection
628 .outgoing_tx
629 .unbounded_send(Message::Envelope(response.into_envelope(
630 message_id,
631 Some(receipt.message_id),
632 None,
633 )))?;
634 Ok(())
635 }
636
637 pub fn respond_with_unhandled_message(
638 &self,
639 sender_id: ConnectionId,
640 request_message_id: u32,
641 message_type_name: &'static str,
642 ) -> Result<()> {
643 let connection = self.connection_state(sender_id)?;
644 let response = ErrorCode::Internal
645 .message(format!("message {} was not handled", message_type_name))
646 .to_proto();
647 let message_id = connection
648 .next_message_id
649 .fetch_add(1, atomic::Ordering::SeqCst);
650 connection
651 .outgoing_tx
652 .unbounded_send(Message::Envelope(response.into_envelope(
653 message_id,
654 Some(request_message_id),
655 None,
656 )))?;
657 Ok(())
658 }
659
660 fn connection_state(&self, connection_id: ConnectionId) -> Result<ConnectionState> {
661 let connections = self.connections.read();
662 let connection = connections
663 .get(&connection_id)
664 .with_context(|| format!("no such connection: {connection_id}"))?;
665 Ok(connection.clone())
666 }
667}
668
669impl Serialize for Peer {
670 fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
671 where
672 S: serde::Serializer,
673 {
674 let mut state = serializer.serialize_struct("Peer", 2)?;
675 state.serialize_field("connections", &*self.connections.read())?;
676 state.end()
677 }
678}
679
680#[cfg(test)]
681mod tests {
682 use super::*;
683 use async_tungstenite::tungstenite::Message as WebSocketMessage;
684 use gpui::TestAppContext;
685
686 fn init_logger() {
687 zlog::init_test();
688 }
689
690 #[gpui::test(iterations = 50)]
691 async fn test_request_response(cx: &mut TestAppContext) {
692 init_logger();
693
694 let executor = cx.executor();
695
696 // create 2 clients connected to 1 server
697 let server = Peer::new(0);
698 let client1 = Peer::new(0);
699 let client2 = Peer::new(0);
700
701 let (client1_to_server_conn, server_to_client_1_conn, _kill) =
702 Connection::in_memory(cx.executor());
703 let (client1_conn_id, io_task1, client1_incoming) =
704 client1.add_test_connection(client1_to_server_conn, cx.executor());
705 let (_, io_task2, server_incoming1) =
706 server.add_test_connection(server_to_client_1_conn, cx.executor());
707
708 let (client2_to_server_conn, server_to_client_2_conn, _kill) =
709 Connection::in_memory(cx.executor());
710 let (client2_conn_id, io_task3, client2_incoming) =
711 client2.add_test_connection(client2_to_server_conn, cx.executor());
712 let (_, io_task4, server_incoming2) =
713 server.add_test_connection(server_to_client_2_conn, cx.executor());
714
715 executor.spawn(io_task1).detach();
716 executor.spawn(io_task2).detach();
717 executor.spawn(io_task3).detach();
718 executor.spawn(io_task4).detach();
719 executor
720 .spawn(handle_messages(server_incoming1, server.clone()))
721 .detach();
722 executor
723 .spawn(handle_messages(client1_incoming, client1.clone()))
724 .detach();
725 executor
726 .spawn(handle_messages(server_incoming2, server.clone()))
727 .detach();
728 executor
729 .spawn(handle_messages(client2_incoming, client2.clone()))
730 .detach();
731
732 assert_eq!(
733 client1
734 .request(client1_conn_id, proto::Ping {},)
735 .await
736 .unwrap(),
737 proto::Ack {}
738 );
739
740 assert_eq!(
741 client2
742 .request(client2_conn_id, proto::Ping {},)
743 .await
744 .unwrap(),
745 proto::Ack {}
746 );
747
748 assert_eq!(
749 client1
750 .request(client1_conn_id, proto::Test { id: 1 },)
751 .await
752 .unwrap(),
753 proto::Test { id: 1 }
754 );
755
756 assert_eq!(
757 client2
758 .request(client2_conn_id, proto::Test { id: 2 })
759 .await
760 .unwrap(),
761 proto::Test { id: 2 }
762 );
763
764 client1.disconnect(client1_conn_id);
765 client2.disconnect(client1_conn_id);
766
767 async fn handle_messages(
768 mut messages: BoxStream<'static, Box<dyn AnyTypedEnvelope>>,
769 peer: Arc<Peer>,
770 ) -> Result<()> {
771 while let Some(envelope) = messages.next().await {
772 let envelope = envelope.into_any();
773 if let Some(envelope) = envelope.downcast_ref::<TypedEnvelope<proto::Ping>>() {
774 let receipt = envelope.receipt();
775 peer.respond(receipt, proto::Ack {})?
776 } else if let Some(envelope) = envelope.downcast_ref::<TypedEnvelope<proto::Test>>()
777 {
778 peer.respond(envelope.receipt(), envelope.payload.clone())?
779 } else {
780 panic!("unknown message type");
781 }
782 }
783
784 Ok(())
785 }
786 }
787
788 #[gpui::test(iterations = 50)]
789 async fn test_order_of_response_and_incoming(cx: &mut TestAppContext) {
790 let executor = cx.executor();
791 let server = Peer::new(0);
792 let client = Peer::new(0);
793
794 let (client_to_server_conn, server_to_client_conn, _kill) =
795 Connection::in_memory(executor.clone());
796 let (client_to_server_conn_id, io_task1, mut client_incoming) =
797 client.add_test_connection(client_to_server_conn, executor.clone());
798
799 let (server_to_client_conn_id, io_task2, mut server_incoming) =
800 server.add_test_connection(server_to_client_conn, executor.clone());
801
802 executor.spawn(io_task1).detach();
803 executor.spawn(io_task2).detach();
804
805 executor
806 .spawn(async move {
807 let future = server_incoming.next().await;
808 let request = future
809 .unwrap()
810 .into_any()
811 .downcast::<TypedEnvelope<proto::Ping>>()
812 .unwrap();
813
814 server
815 .send(
816 server_to_client_conn_id,
817 ErrorCode::Internal
818 .message("message 1".to_string())
819 .to_proto(),
820 )
821 .unwrap();
822 server
823 .send(
824 server_to_client_conn_id,
825 ErrorCode::Internal
826 .message("message 2".to_string())
827 .to_proto(),
828 )
829 .unwrap();
830 server.respond(request.receipt(), proto::Ack {}).unwrap();
831
832 // Prevent the connection from being dropped
833 server_incoming.next().await;
834 })
835 .detach();
836
837 let events = Arc::new(Mutex::new(Vec::new()));
838
839 let response = client.request(client_to_server_conn_id, proto::Ping {});
840 let response_task = executor.spawn({
841 let events = events.clone();
842 async move {
843 response.await.unwrap();
844 events.lock().push("response".to_string());
845 }
846 });
847
848 executor
849 .spawn({
850 let events = events.clone();
851 async move {
852 let incoming1 = client_incoming
853 .next()
854 .await
855 .unwrap()
856 .into_any()
857 .downcast::<TypedEnvelope<proto::Error>>()
858 .unwrap();
859 events.lock().push(incoming1.payload.message);
860 let incoming2 = client_incoming
861 .next()
862 .await
863 .unwrap()
864 .into_any()
865 .downcast::<TypedEnvelope<proto::Error>>()
866 .unwrap();
867 events.lock().push(incoming2.payload.message);
868
869 // Prevent the connection from being dropped
870 client_incoming.next().await;
871 }
872 })
873 .detach();
874
875 response_task.await;
876 assert_eq!(
877 &*events.lock(),
878 &[
879 "message 1".to_string(),
880 "message 2".to_string(),
881 "response".to_string()
882 ]
883 );
884 }
885
886 #[gpui::test(iterations = 50)]
887 async fn test_dropping_request_before_completion(cx: &mut TestAppContext) {
888 let executor = cx.executor();
889 let server = Peer::new(0);
890 let client = Peer::new(0);
891
892 let (client_to_server_conn, server_to_client_conn, _kill) =
893 Connection::in_memory(cx.executor());
894 let (client_to_server_conn_id, io_task1, mut client_incoming) =
895 client.add_test_connection(client_to_server_conn, cx.executor());
896 let (server_to_client_conn_id, io_task2, mut server_incoming) =
897 server.add_test_connection(server_to_client_conn, cx.executor());
898
899 executor.spawn(io_task1).detach();
900 executor.spawn(io_task2).detach();
901
902 executor
903 .spawn(async move {
904 let request1 = server_incoming
905 .next()
906 .await
907 .unwrap()
908 .into_any()
909 .downcast::<TypedEnvelope<proto::Ping>>()
910 .unwrap();
911 let request2 = server_incoming
912 .next()
913 .await
914 .unwrap()
915 .into_any()
916 .downcast::<TypedEnvelope<proto::Ping>>()
917 .unwrap();
918
919 server
920 .send(
921 server_to_client_conn_id,
922 ErrorCode::Internal
923 .message("message 1".to_string())
924 .to_proto(),
925 )
926 .unwrap();
927 server
928 .send(
929 server_to_client_conn_id,
930 ErrorCode::Internal
931 .message("message 2".to_string())
932 .to_proto(),
933 )
934 .unwrap();
935 server.respond(request1.receipt(), proto::Ack {}).unwrap();
936 server.respond(request2.receipt(), proto::Ack {}).unwrap();
937
938 // Prevent the connection from being dropped
939 server_incoming.next().await;
940 })
941 .detach();
942
943 let events = Arc::new(Mutex::new(Vec::new()));
944
945 let request1 = client.request(client_to_server_conn_id, proto::Ping {});
946 let request1_task = executor.spawn(request1);
947 let request2 = client.request(client_to_server_conn_id, proto::Ping {});
948 let request2_task = executor.spawn({
949 let events = events.clone();
950 async move {
951 request2.await.unwrap();
952 events.lock().push("response 2".to_string());
953 }
954 });
955
956 executor
957 .spawn({
958 let events = events.clone();
959 async move {
960 let incoming1 = client_incoming
961 .next()
962 .await
963 .unwrap()
964 .into_any()
965 .downcast::<TypedEnvelope<proto::Error>>()
966 .unwrap();
967 events.lock().push(incoming1.payload.message);
968 let incoming2 = client_incoming
969 .next()
970 .await
971 .unwrap()
972 .into_any()
973 .downcast::<TypedEnvelope<proto::Error>>()
974 .unwrap();
975 events.lock().push(incoming2.payload.message);
976
977 // Prevent the connection from being dropped
978 client_incoming.next().await;
979 }
980 })
981 .detach();
982
983 // Allow the request to make some progress before dropping it.
984 cx.executor().simulate_random_delay().await;
985 drop(request1_task);
986
987 request2_task.await;
988 assert_eq!(
989 &*events.lock(),
990 &[
991 "message 1".to_string(),
992 "message 2".to_string(),
993 "response 2".to_string()
994 ]
995 );
996 }
997
998 #[gpui::test(iterations = 50)]
999 async fn test_disconnect(cx: &mut TestAppContext) {
1000 let executor = cx.executor();
1001
1002 let (client_conn, mut server_conn, _kill) = Connection::in_memory(executor.clone());
1003
1004 let client = Peer::new(0);
1005 let (connection_id, io_handler, mut incoming) =
1006 client.add_test_connection(client_conn, executor.clone());
1007
1008 let (io_ended_tx, io_ended_rx) = oneshot::channel();
1009 executor
1010 .spawn(async move {
1011 io_handler.await.ok();
1012 io_ended_tx.send(()).unwrap();
1013 })
1014 .detach();
1015
1016 let (messages_ended_tx, messages_ended_rx) = oneshot::channel();
1017 executor
1018 .spawn(async move {
1019 incoming.next().await;
1020 messages_ended_tx.send(()).unwrap();
1021 })
1022 .detach();
1023
1024 client.disconnect(connection_id);
1025
1026 let _ = io_ended_rx.await;
1027 let _ = messages_ended_rx.await;
1028 assert!(
1029 server_conn
1030 .send(WebSocketMessage::Binary(vec![].into()))
1031 .await
1032 .is_err()
1033 );
1034 }
1035
1036 #[gpui::test(iterations = 50)]
1037 async fn test_io_error(cx: &mut TestAppContext) {
1038 let executor = cx.executor();
1039 let (client_conn, mut server_conn, _kill) = Connection::in_memory(executor.clone());
1040
1041 let client = Peer::new(0);
1042 let (connection_id, io_handler, mut incoming) =
1043 client.add_test_connection(client_conn, executor.clone());
1044 executor.spawn(io_handler).detach();
1045 executor
1046 .spawn(async move { incoming.next().await })
1047 .detach();
1048
1049 let response = executor.spawn(client.request(connection_id, proto::Ping {}));
1050 let _request = server_conn.rx.next().await.unwrap().unwrap();
1051
1052 drop(server_conn);
1053 assert_eq!(
1054 response.await.unwrap_err().to_string(),
1055 "connection was closed"
1056 );
1057 }
1058}