1pub use lsp_types::*;
2
3use anyhow::{anyhow, Context, Result};
4use collections::HashMap;
5use futures::{channel::oneshot, io::BufWriter, AsyncRead, AsyncWrite};
6use gpui::{executor, AsyncAppContext, Task};
7use parking_lot::Mutex;
8use postage::{barrier, prelude::Stream};
9use serde::{de::DeserializeOwned, Deserialize, Serialize};
10use serde_json::{json, value::RawValue, Value};
11use smol::{
12 channel,
13 io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader},
14 process,
15};
16use std::{
17 future::Future,
18 io::Write,
19 path::PathBuf,
20 str::FromStr,
21 sync::{
22 atomic::{AtomicUsize, Ordering::SeqCst},
23 Arc,
24 },
25};
26use std::{path::Path, process::Stdio};
27use util::{ResultExt, TryFutureExt};
28
29const JSON_RPC_VERSION: &'static str = "2.0";
30const CONTENT_LEN_HEADER: &'static str = "Content-Length: ";
31
32type NotificationHandler = Box<dyn Send + FnMut(Option<usize>, &str, AsyncAppContext)>;
33type ResponseHandler = Box<dyn Send + FnOnce(Result<&str, Error>)>;
34
35pub struct LanguageServer {
36 server_id: usize,
37 next_id: AtomicUsize,
38 outbound_tx: channel::Sender<Vec<u8>>,
39 name: String,
40 capabilities: ServerCapabilities,
41 notification_handlers: Arc<Mutex<HashMap<&'static str, NotificationHandler>>>,
42 response_handlers: Arc<Mutex<HashMap<usize, ResponseHandler>>>,
43 executor: Arc<executor::Background>,
44 io_tasks: Mutex<Option<(Task<Option<()>>, Task<Option<()>>)>>,
45 output_done_rx: Mutex<Option<barrier::Receiver>>,
46 root_path: PathBuf,
47}
48
49pub struct Subscription {
50 method: &'static str,
51 notification_handlers: Arc<Mutex<HashMap<&'static str, NotificationHandler>>>,
52}
53
54#[derive(Serialize, Deserialize)]
55struct Request<'a, T> {
56 jsonrpc: &'a str,
57 id: usize,
58 method: &'a str,
59 params: T,
60}
61
62#[derive(Serialize, Deserialize)]
63struct AnyResponse<'a> {
64 id: usize,
65 #[serde(default)]
66 error: Option<Error>,
67 #[serde(borrow)]
68 result: Option<&'a RawValue>,
69}
70
71#[derive(Serialize)]
72struct Response<T> {
73 id: usize,
74 result: Option<T>,
75 error: Option<Error>,
76}
77
78#[derive(Serialize, Deserialize)]
79struct Notification<'a, T> {
80 #[serde(borrow)]
81 jsonrpc: &'a str,
82 #[serde(borrow)]
83 method: &'a str,
84 params: T,
85}
86
87#[derive(Deserialize)]
88struct AnyNotification<'a> {
89 #[serde(default)]
90 id: Option<usize>,
91 #[serde(borrow)]
92 method: &'a str,
93 #[serde(borrow)]
94 params: &'a RawValue,
95}
96
97#[derive(Debug, Serialize, Deserialize)]
98struct Error {
99 message: String,
100}
101
102impl LanguageServer {
103 pub fn new(
104 server_id: usize,
105 binary_path: &Path,
106 args: &[&str],
107 root_path: &Path,
108 cx: AsyncAppContext,
109 ) -> Result<Self> {
110 let working_dir = if root_path.is_dir() {
111 root_path
112 } else {
113 root_path.parent().unwrap_or(Path::new("/"))
114 };
115 let mut server = process::Command::new(binary_path)
116 .current_dir(working_dir)
117 .args(args)
118 .stdin(Stdio::piped())
119 .stdout(Stdio::piped())
120 .stderr(Stdio::inherit())
121 .spawn()?;
122 let stdin = server.stdin.take().unwrap();
123 let stdout = server.stdout.take().unwrap();
124 let mut server =
125 Self::new_internal(server_id, stdin, stdout, root_path, cx, |notification| {
126 log::info!(
127 "unhandled notification {}:\n{}",
128 notification.method,
129 serde_json::to_string_pretty(
130 &Value::from_str(notification.params.get()).unwrap()
131 )
132 .unwrap()
133 );
134 });
135 if let Some(name) = binary_path.file_name() {
136 server.name = name.to_string_lossy().to_string();
137 }
138 Ok(server)
139 }
140
141 fn new_internal<Stdin, Stdout, F>(
142 server_id: usize,
143 stdin: Stdin,
144 stdout: Stdout,
145 root_path: &Path,
146 cx: AsyncAppContext,
147 mut on_unhandled_notification: F,
148 ) -> Self
149 where
150 Stdin: AsyncWrite + Unpin + Send + 'static,
151 Stdout: AsyncRead + Unpin + Send + 'static,
152 F: FnMut(AnyNotification) + 'static + Send,
153 {
154 let mut stdin = BufWriter::new(stdin);
155 let mut stdout = BufReader::new(stdout);
156 let (outbound_tx, outbound_rx) = channel::unbounded::<Vec<u8>>();
157 let notification_handlers =
158 Arc::new(Mutex::new(HashMap::<_, NotificationHandler>::default()));
159 let response_handlers = Arc::new(Mutex::new(HashMap::<_, ResponseHandler>::default()));
160 let input_task = cx.spawn(|cx| {
161 let notification_handlers = notification_handlers.clone();
162 let response_handlers = response_handlers.clone();
163 async move {
164 let _clear_response_handlers = ClearResponseHandlers(response_handlers.clone());
165 let mut buffer = Vec::new();
166 loop {
167 buffer.clear();
168 stdout.read_until(b'\n', &mut buffer).await?;
169 stdout.read_until(b'\n', &mut buffer).await?;
170 let message_len: usize = std::str::from_utf8(&buffer)?
171 .strip_prefix(CONTENT_LEN_HEADER)
172 .ok_or_else(|| anyhow!("invalid header"))?
173 .trim_end()
174 .parse()?;
175
176 buffer.resize(message_len, 0);
177 stdout.read_exact(&mut buffer).await?;
178 log::trace!("incoming message:{}", String::from_utf8_lossy(&buffer));
179
180 if let Ok(msg) = serde_json::from_slice::<AnyNotification>(&buffer) {
181 if let Some(handler) = notification_handlers.lock().get_mut(msg.method) {
182 handler(msg.id, msg.params.get(), cx.clone());
183 } else {
184 on_unhandled_notification(msg);
185 }
186 } else if let Ok(AnyResponse { id, error, result }) =
187 serde_json::from_slice(&buffer)
188 {
189 if let Some(handler) = response_handlers.lock().remove(&id) {
190 if let Some(error) = error {
191 handler(Err(error));
192 } else if let Some(result) = result {
193 handler(Ok(result.get()));
194 } else {
195 handler(Ok("null"));
196 }
197 }
198 } else {
199 return Err(anyhow!(
200 "failed to deserialize message:\n{}",
201 std::str::from_utf8(&buffer)?
202 ));
203 }
204
205 // Don't starve the main thread when receiving lots of messages at once.
206 smol::future::yield_now().await;
207 }
208 }
209 .log_err()
210 });
211 let (output_done_tx, output_done_rx) = barrier::channel();
212 let output_task = cx.background().spawn({
213 let response_handlers = response_handlers.clone();
214 async move {
215 let _clear_response_handlers = ClearResponseHandlers(response_handlers);
216 let mut content_len_buffer = Vec::new();
217 while let Ok(message) = outbound_rx.recv().await {
218 log::trace!("outgoing message:{}", String::from_utf8_lossy(&message));
219 content_len_buffer.clear();
220 write!(content_len_buffer, "{}", message.len()).unwrap();
221 stdin.write_all(CONTENT_LEN_HEADER.as_bytes()).await?;
222 stdin.write_all(&content_len_buffer).await?;
223 stdin.write_all("\r\n\r\n".as_bytes()).await?;
224 stdin.write_all(&message).await?;
225 stdin.flush().await?;
226 }
227 drop(output_done_tx);
228 Ok(())
229 }
230 .log_err()
231 });
232
233 Self {
234 server_id,
235 notification_handlers,
236 response_handlers,
237 name: Default::default(),
238 capabilities: Default::default(),
239 next_id: Default::default(),
240 outbound_tx,
241 executor: cx.background().clone(),
242 io_tasks: Mutex::new(Some((input_task, output_task))),
243 output_done_rx: Mutex::new(Some(output_done_rx)),
244 root_path: root_path.to_path_buf(),
245 }
246 }
247
248 pub async fn initialize(mut self, options: Option<Value>) -> Result<Arc<Self>> {
249 let root_uri = Url::from_file_path(&self.root_path).unwrap();
250 #[allow(deprecated)]
251 let params = InitializeParams {
252 process_id: Default::default(),
253 root_path: Default::default(),
254 root_uri: Some(root_uri),
255 initialization_options: options,
256 capabilities: ClientCapabilities {
257 workspace: Some(WorkspaceClientCapabilities {
258 configuration: Some(true),
259 did_change_configuration: Some(DynamicRegistrationClientCapabilities {
260 dynamic_registration: Some(true),
261 }),
262 ..Default::default()
263 }),
264 text_document: Some(TextDocumentClientCapabilities {
265 definition: Some(GotoCapability {
266 link_support: Some(true),
267 ..Default::default()
268 }),
269 code_action: Some(CodeActionClientCapabilities {
270 code_action_literal_support: Some(CodeActionLiteralSupport {
271 code_action_kind: CodeActionKindLiteralSupport {
272 value_set: vec![
273 CodeActionKind::REFACTOR.as_str().into(),
274 CodeActionKind::QUICKFIX.as_str().into(),
275 CodeActionKind::SOURCE.as_str().into(),
276 ],
277 },
278 }),
279 data_support: Some(true),
280 resolve_support: Some(CodeActionCapabilityResolveSupport {
281 properties: vec!["edit".to_string(), "command".to_string()],
282 }),
283 ..Default::default()
284 }),
285 completion: Some(CompletionClientCapabilities {
286 completion_item: Some(CompletionItemCapability {
287 snippet_support: Some(true),
288 resolve_support: Some(CompletionItemCapabilityResolveSupport {
289 properties: vec!["additionalTextEdits".to_string()],
290 }),
291 ..Default::default()
292 }),
293 ..Default::default()
294 }),
295 ..Default::default()
296 }),
297 experimental: Some(json!({
298 "serverStatusNotification": true,
299 })),
300 window: Some(WindowClientCapabilities {
301 work_done_progress: Some(true),
302 ..Default::default()
303 }),
304 ..Default::default()
305 },
306 trace: Default::default(),
307 workspace_folders: Default::default(),
308 client_info: Default::default(),
309 locale: Default::default(),
310 };
311
312 let response = self.request::<request::Initialize>(params).await?;
313 if let Some(info) = response.server_info {
314 self.name = info.name;
315 }
316 self.capabilities = response.capabilities;
317
318 self.notify::<notification::Initialized>(InitializedParams {})?;
319 Ok(Arc::new(self))
320 }
321
322 pub fn shutdown(&self) -> Option<impl 'static + Send + Future<Output = Option<()>>> {
323 if let Some(tasks) = self.io_tasks.lock().take() {
324 let response_handlers = self.response_handlers.clone();
325 let next_id = AtomicUsize::new(self.next_id.load(SeqCst));
326 let outbound_tx = self.outbound_tx.clone();
327 let mut output_done = self.output_done_rx.lock().take().unwrap();
328 let shutdown_request = Self::request_internal::<request::Shutdown>(
329 &next_id,
330 &response_handlers,
331 &outbound_tx,
332 (),
333 );
334 let exit = Self::notify_internal::<notification::Exit>(&outbound_tx, ());
335 outbound_tx.close();
336 Some(
337 async move {
338 log::debug!("language server shutdown started");
339 shutdown_request.await?;
340 response_handlers.lock().clear();
341 exit?;
342 output_done.recv().await;
343 log::debug!("language server shutdown finished");
344 drop(tasks);
345 Ok(())
346 }
347 .log_err(),
348 )
349 } else {
350 None
351 }
352 }
353
354 #[must_use]
355 pub fn on_notification<T, F>(&self, f: F) -> Subscription
356 where
357 T: notification::Notification,
358 F: 'static + Send + FnMut(T::Params, AsyncAppContext),
359 {
360 self.on_custom_notification(T::METHOD, f)
361 }
362
363 #[must_use]
364 pub fn on_request<T, F, Fut>(&self, f: F) -> Subscription
365 where
366 T: request::Request,
367 T::Params: 'static + Send,
368 F: 'static + Send + FnMut(T::Params, AsyncAppContext) -> Fut,
369 Fut: 'static + Future<Output = Result<T::Result>>,
370 {
371 self.on_custom_request(T::METHOD, f)
372 }
373
374 pub fn remove_request_handler<T: request::Request>(&self) {
375 self.notification_handlers.lock().remove(T::METHOD);
376 }
377
378 #[must_use]
379 pub fn on_custom_notification<Params, F>(&self, method: &'static str, mut f: F) -> Subscription
380 where
381 F: 'static + Send + FnMut(Params, AsyncAppContext),
382 Params: DeserializeOwned,
383 {
384 let prev_handler = self.notification_handlers.lock().insert(
385 method,
386 Box::new(move |_, params, cx| {
387 if let Some(params) = serde_json::from_str(params).log_err() {
388 f(params, cx);
389 }
390 }),
391 );
392 assert!(
393 prev_handler.is_none(),
394 "registered multiple handlers for the same LSP method"
395 );
396 Subscription {
397 method,
398 notification_handlers: self.notification_handlers.clone(),
399 }
400 }
401
402 #[must_use]
403 pub fn on_custom_request<Params, Res, Fut, F>(
404 &self,
405 method: &'static str,
406 mut f: F,
407 ) -> Subscription
408 where
409 F: 'static + Send + FnMut(Params, AsyncAppContext) -> Fut,
410 Fut: 'static + Future<Output = Result<Res>>,
411 Params: DeserializeOwned + Send + 'static,
412 Res: Serialize,
413 {
414 let outbound_tx = self.outbound_tx.clone();
415 let prev_handler = self.notification_handlers.lock().insert(
416 method,
417 Box::new(move |id, params, cx| {
418 if let Some(id) = id {
419 if let Some(params) = serde_json::from_str(params).log_err() {
420 let response = f(params, cx.clone());
421 cx.foreground()
422 .spawn({
423 let outbound_tx = outbound_tx.clone();
424 async move {
425 let response = match response.await {
426 Ok(result) => Response {
427 id,
428 result: Some(result),
429 error: None,
430 },
431 Err(error) => Response {
432 id,
433 result: None,
434 error: Some(Error {
435 message: error.to_string(),
436 }),
437 },
438 };
439 if let Some(response) = serde_json::to_vec(&response).log_err()
440 {
441 outbound_tx.try_send(response).ok();
442 }
443 }
444 })
445 .detach();
446 }
447 }
448 }),
449 );
450 assert!(
451 prev_handler.is_none(),
452 "registered multiple handlers for the same LSP method"
453 );
454 Subscription {
455 method,
456 notification_handlers: self.notification_handlers.clone(),
457 }
458 }
459
460 pub fn name<'a>(self: &'a Arc<Self>) -> &'a str {
461 &self.name
462 }
463
464 pub fn capabilities<'a>(self: &'a Arc<Self>) -> &'a ServerCapabilities {
465 &self.capabilities
466 }
467
468 pub fn server_id(&self) -> usize {
469 self.server_id
470 }
471
472 pub fn request<T: request::Request>(
473 &self,
474 params: T::Params,
475 ) -> impl Future<Output = Result<T::Result>>
476 where
477 T::Result: 'static + Send,
478 {
479 Self::request_internal::<T>(
480 &self.next_id,
481 &self.response_handlers,
482 &self.outbound_tx,
483 params,
484 )
485 }
486
487 fn request_internal<T: request::Request>(
488 next_id: &AtomicUsize,
489 response_handlers: &Mutex<HashMap<usize, ResponseHandler>>,
490 outbound_tx: &channel::Sender<Vec<u8>>,
491 params: T::Params,
492 ) -> impl 'static + Future<Output = Result<T::Result>>
493 where
494 T::Result: 'static + Send,
495 {
496 let id = next_id.fetch_add(1, SeqCst);
497 let message = serde_json::to_vec(&Request {
498 jsonrpc: JSON_RPC_VERSION,
499 id,
500 method: T::METHOD,
501 params,
502 })
503 .unwrap();
504
505 let send = outbound_tx
506 .try_send(message)
507 .context("failed to write to language server's stdin");
508
509 let (tx, rx) = oneshot::channel();
510 response_handlers.lock().insert(
511 id,
512 Box::new(move |result| {
513 let response = match result {
514 Ok(response) => {
515 serde_json::from_str(response).context("failed to deserialize response")
516 }
517 Err(error) => Err(anyhow!("{}", error.message)),
518 };
519 let _ = tx.send(response);
520 }),
521 );
522
523 async move {
524 send?;
525 rx.await?
526 }
527 }
528
529 pub fn notify<T: notification::Notification>(&self, params: T::Params) -> Result<()> {
530 Self::notify_internal::<T>(&self.outbound_tx, params)
531 }
532
533 fn notify_internal<T: notification::Notification>(
534 outbound_tx: &channel::Sender<Vec<u8>>,
535 params: T::Params,
536 ) -> Result<()> {
537 let message = serde_json::to_vec(&Notification {
538 jsonrpc: JSON_RPC_VERSION,
539 method: T::METHOD,
540 params,
541 })
542 .unwrap();
543 outbound_tx.try_send(message)?;
544 Ok(())
545 }
546}
547
548impl Drop for LanguageServer {
549 fn drop(&mut self) {
550 if let Some(shutdown) = self.shutdown() {
551 self.executor.spawn(shutdown).detach();
552 }
553 }
554}
555
556impl Subscription {
557 pub fn detach(mut self) {
558 self.method = "";
559 }
560}
561
562impl Drop for Subscription {
563 fn drop(&mut self) {
564 self.notification_handlers.lock().remove(self.method);
565 }
566}
567
568#[cfg(any(test, feature = "test-support"))]
569#[derive(Clone)]
570pub struct FakeLanguageServer {
571 pub server: Arc<LanguageServer>,
572 notifications_rx: channel::Receiver<(String, String)>,
573}
574
575#[cfg(any(test, feature = "test-support"))]
576impl LanguageServer {
577 pub fn full_capabilities() -> ServerCapabilities {
578 ServerCapabilities {
579 document_highlight_provider: Some(OneOf::Left(true)),
580 code_action_provider: Some(CodeActionProviderCapability::Simple(true)),
581 document_formatting_provider: Some(OneOf::Left(true)),
582 document_range_formatting_provider: Some(OneOf::Left(true)),
583 ..Default::default()
584 }
585 }
586
587 pub fn fake(cx: AsyncAppContext) -> (Self, FakeLanguageServer) {
588 Self::fake_with_capabilities(Self::full_capabilities(), cx)
589 }
590
591 pub fn fake_with_capabilities(
592 capabilities: ServerCapabilities,
593 cx: AsyncAppContext,
594 ) -> (Self, FakeLanguageServer) {
595 let (stdin_writer, stdin_reader) = async_pipe::pipe();
596 let (stdout_writer, stdout_reader) = async_pipe::pipe();
597 let (notifications_tx, notifications_rx) = channel::unbounded();
598
599 let server = Self::new_internal(
600 0,
601 stdin_writer,
602 stdout_reader,
603 Path::new("/"),
604 cx.clone(),
605 |_| {},
606 );
607 let fake = FakeLanguageServer {
608 server: Arc::new(Self::new_internal(
609 0,
610 stdout_writer,
611 stdin_reader,
612 Path::new("/"),
613 cx.clone(),
614 move |msg| {
615 notifications_tx
616 .try_send((msg.method.to_string(), msg.params.get().to_string()))
617 .ok();
618 },
619 )),
620 notifications_rx,
621 };
622 fake.handle_request::<request::Initialize, _, _>({
623 let capabilities = capabilities.clone();
624 move |_, _| {
625 let capabilities = capabilities.clone();
626 async move {
627 Ok(InitializeResult {
628 capabilities,
629 ..Default::default()
630 })
631 }
632 }
633 });
634
635 (server, fake)
636 }
637}
638
639#[cfg(any(test, feature = "test-support"))]
640impl FakeLanguageServer {
641 pub fn notify<T: notification::Notification>(&self, params: T::Params) {
642 self.server.notify::<T>(params).ok();
643 }
644
645 pub async fn receive_notification<T: notification::Notification>(&mut self) -> T::Params {
646 use futures::StreamExt as _;
647
648 loop {
649 let (method, params) = self.notifications_rx.next().await.unwrap();
650 if &method == T::METHOD {
651 return serde_json::from_str::<T::Params>(¶ms).unwrap();
652 } else {
653 log::info!("skipping message in fake language server {:?}", params);
654 }
655 }
656 }
657
658 pub fn handle_request<T, F, Fut>(
659 &self,
660 mut handler: F,
661 ) -> futures::channel::mpsc::UnboundedReceiver<()>
662 where
663 T: 'static + request::Request,
664 T::Params: 'static + Send,
665 F: 'static + Send + FnMut(T::Params, gpui::AsyncAppContext) -> Fut,
666 Fut: 'static + Send + Future<Output = Result<T::Result>>,
667 {
668 let (responded_tx, responded_rx) = futures::channel::mpsc::unbounded();
669 self.server.remove_request_handler::<T>();
670 self.server
671 .on_request::<T, _, _>(move |params, cx| {
672 let result = handler(params, cx.clone());
673 let responded_tx = responded_tx.clone();
674 async move {
675 cx.background().simulate_random_delay().await;
676 let result = result.await;
677 responded_tx.unbounded_send(()).ok();
678 result
679 }
680 })
681 .detach();
682 responded_rx
683 }
684
685 pub fn remove_request_handler<T>(&mut self)
686 where
687 T: 'static + request::Request,
688 {
689 self.server.remove_request_handler::<T>();
690 }
691
692 pub async fn start_progress(&mut self, token: impl Into<String>) {
693 self.notify::<notification::Progress>(ProgressParams {
694 token: NumberOrString::String(token.into()),
695 value: ProgressParamsValue::WorkDone(WorkDoneProgress::Begin(Default::default())),
696 });
697 }
698
699 pub async fn end_progress(&mut self, token: impl Into<String>) {
700 self.notify::<notification::Progress>(ProgressParams {
701 token: NumberOrString::String(token.into()),
702 value: ProgressParamsValue::WorkDone(WorkDoneProgress::End(Default::default())),
703 });
704 }
705}
706
707struct ClearResponseHandlers(Arc<Mutex<HashMap<usize, ResponseHandler>>>);
708
709impl Drop for ClearResponseHandlers {
710 fn drop(&mut self) {
711 self.0.lock().clear();
712 }
713}
714
715#[cfg(test)]
716mod tests {
717 use super::*;
718 use gpui::TestAppContext;
719
720 #[ctor::ctor]
721 fn init_logger() {
722 if std::env::var("RUST_LOG").is_ok() {
723 env_logger::init();
724 }
725 }
726
727 #[gpui::test]
728 async fn test_fake(cx: &mut TestAppContext) {
729 let (server, mut fake) = LanguageServer::fake(cx.to_async());
730
731 let (message_tx, message_rx) = channel::unbounded();
732 let (diagnostics_tx, diagnostics_rx) = channel::unbounded();
733 server
734 .on_notification::<notification::ShowMessage, _>(move |params, _| {
735 message_tx.try_send(params).unwrap()
736 })
737 .detach();
738 server
739 .on_notification::<notification::PublishDiagnostics, _>(move |params, _| {
740 diagnostics_tx.try_send(params).unwrap()
741 })
742 .detach();
743
744 let server = server.initialize(None).await.unwrap();
745 server
746 .notify::<notification::DidOpenTextDocument>(DidOpenTextDocumentParams {
747 text_document: TextDocumentItem::new(
748 Url::from_str("file://a/b").unwrap(),
749 "rust".to_string(),
750 0,
751 "".to_string(),
752 ),
753 })
754 .unwrap();
755 assert_eq!(
756 fake.receive_notification::<notification::DidOpenTextDocument>()
757 .await
758 .text_document
759 .uri
760 .as_str(),
761 "file://a/b"
762 );
763
764 fake.notify::<notification::ShowMessage>(ShowMessageParams {
765 typ: MessageType::ERROR,
766 message: "ok".to_string(),
767 });
768 fake.notify::<notification::PublishDiagnostics>(PublishDiagnosticsParams {
769 uri: Url::from_str("file://b/c").unwrap(),
770 version: Some(5),
771 diagnostics: vec![],
772 });
773 assert_eq!(message_rx.recv().await.unwrap().message, "ok");
774 assert_eq!(
775 diagnostics_rx.recv().await.unwrap().uri.as_str(),
776 "file://b/c"
777 );
778
779 fake.handle_request::<request::Shutdown, _, _>(|_, _| async move { Ok(()) });
780
781 drop(server);
782 fake.receive_notification::<notification::Exit>().await;
783 }
784}