1mod input_handler;
2
3pub use lsp_types::request::*;
4pub use lsp_types::*;
5
6use anyhow::{Context as _, Result, anyhow};
7use collections::HashMap;
8use futures::{
9 AsyncRead, AsyncWrite, Future, FutureExt,
10 channel::oneshot::{self, Canceled},
11 io::BufWriter,
12 select,
13};
14use gpui::{App, AppContext as _, AsyncApp, BackgroundExecutor, SharedString, Task};
15use notification::DidChangeWorkspaceFolders;
16use parking_lot::{Mutex, RwLock};
17use postage::{barrier, prelude::Stream};
18use schemars::JsonSchema;
19use serde::{Deserialize, Serialize, de::DeserializeOwned};
20use serde_json::{Value, json, value::RawValue};
21use smol::{
22 channel,
23 io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
24 process::Child,
25};
26
27use std::{
28 collections::BTreeSet,
29 ffi::{OsStr, OsString},
30 fmt,
31 io::Write,
32 ops::{Deref, DerefMut},
33 path::PathBuf,
34 pin::Pin,
35 sync::{
36 Arc, Weak,
37 atomic::{AtomicI32, Ordering::SeqCst},
38 },
39 task::Poll,
40 time::{Duration, Instant},
41};
42use std::{path::Path, process::Stdio};
43use util::{ConnectionResult, ResultExt, TryFutureExt};
44
45const JSON_RPC_VERSION: &str = "2.0";
46const CONTENT_LEN_HEADER: &str = "Content-Length: ";
47
48const LSP_REQUEST_TIMEOUT: Duration = Duration::from_secs(60 * 2);
49const SERVER_SHUTDOWN_TIMEOUT: Duration = Duration::from_secs(5);
50
51type NotificationHandler = Box<dyn Send + FnMut(Option<RequestId>, Value, &mut AsyncApp)>;
52type ResponseHandler = Box<dyn Send + FnOnce(Result<String, Error>)>;
53type IoHandler = Box<dyn Send + FnMut(IoKind, &str)>;
54
55/// Kind of language server stdio given to an IO handler.
56#[derive(Debug, Clone, Copy)]
57pub enum IoKind {
58 StdOut,
59 StdIn,
60 StdErr,
61}
62
63/// Represents a launchable language server. This can either be a standalone binary or the path
64/// to a runtime with arguments to instruct it to launch the actual language server file.
65#[derive(Debug, Clone, Deserialize)]
66pub struct LanguageServerBinary {
67 pub path: PathBuf,
68 pub arguments: Vec<OsString>,
69 pub env: Option<HashMap<String, String>>,
70}
71
72/// Configures the search (and installation) of language servers.
73#[derive(Debug, Clone, Deserialize)]
74pub struct LanguageServerBinaryOptions {
75 /// Whether the adapter should look at the users system
76 pub allow_path_lookup: bool,
77 /// Whether the adapter should download its own version
78 pub allow_binary_download: bool,
79}
80
81/// A running language server process.
82pub struct LanguageServer {
83 server_id: LanguageServerId,
84 next_id: AtomicI32,
85 outbound_tx: channel::Sender<String>,
86 name: LanguageServerName,
87 process_name: Arc<str>,
88 binary: LanguageServerBinary,
89 capabilities: RwLock<ServerCapabilities>,
90 /// Configuration sent to the server, stored for display in the language server logs
91 /// buffer. This is represented as the message sent to the LSP in order to avoid cloning it (can
92 /// be large in cases like sending schemas to the json server).
93 configuration: Arc<DidChangeConfigurationParams>,
94 code_action_kinds: Option<Vec<CodeActionKind>>,
95 notification_handlers: Arc<Mutex<HashMap<&'static str, NotificationHandler>>>,
96 response_handlers: Arc<Mutex<Option<HashMap<RequestId, ResponseHandler>>>>,
97 io_handlers: Arc<Mutex<HashMap<i32, IoHandler>>>,
98 executor: BackgroundExecutor,
99 #[allow(clippy::type_complexity)]
100 io_tasks: Mutex<Option<(Task<Option<()>>, Task<Option<()>>)>>,
101 output_done_rx: Mutex<Option<barrier::Receiver>>,
102 server: Arc<Mutex<Option<Child>>>,
103 workspace_folders: Arc<Mutex<BTreeSet<Url>>>,
104 root_uri: Url,
105}
106
107#[derive(Clone, Debug, PartialEq, Eq, Hash)]
108pub enum LanguageServerSelector {
109 Id(LanguageServerId),
110 Name(LanguageServerName),
111}
112
113/// Identifies a running language server.
114#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
115#[repr(transparent)]
116pub struct LanguageServerId(pub usize);
117
118impl LanguageServerId {
119 pub fn from_proto(id: u64) -> Self {
120 Self(id as usize)
121 }
122
123 pub fn to_proto(self) -> u64 {
124 self.0 as u64
125 }
126}
127
128/// A name of a language server.
129#[derive(
130 Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize, Serialize, JsonSchema,
131)]
132#[serde(transparent)]
133pub struct LanguageServerName(pub SharedString);
134
135impl std::fmt::Display for LanguageServerName {
136 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
137 std::fmt::Display::fmt(&self.0, f)
138 }
139}
140
141impl AsRef<str> for LanguageServerName {
142 fn as_ref(&self) -> &str {
143 self.0.as_ref()
144 }
145}
146
147impl AsRef<OsStr> for LanguageServerName {
148 fn as_ref(&self) -> &OsStr {
149 self.0.as_ref().as_ref()
150 }
151}
152
153impl LanguageServerName {
154 pub const fn new_static(s: &'static str) -> Self {
155 Self(SharedString::new_static(s))
156 }
157
158 pub fn from_proto(s: String) -> Self {
159 Self(s.into())
160 }
161}
162
163impl<'a> From<&'a str> for LanguageServerName {
164 fn from(str: &'a str) -> LanguageServerName {
165 LanguageServerName(str.to_string().into())
166 }
167}
168
169/// Handle to a language server RPC activity subscription.
170pub enum Subscription {
171 Notification {
172 method: &'static str,
173 notification_handlers: Option<Arc<Mutex<HashMap<&'static str, NotificationHandler>>>>,
174 },
175 Io {
176 id: i32,
177 io_handlers: Option<Weak<Mutex<HashMap<i32, IoHandler>>>>,
178 },
179}
180
181/// Language server protocol RPC request message ID.
182///
183/// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#requestMessage)
184#[derive(Debug, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
185#[serde(untagged)]
186pub enum RequestId {
187 Int(i32),
188 Str(String),
189}
190
191/// Language server protocol RPC request message.
192///
193/// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#requestMessage)
194#[derive(Serialize, Deserialize)]
195pub struct Request<'a, T> {
196 jsonrpc: &'static str,
197 id: RequestId,
198 method: &'a str,
199 params: T,
200}
201
202/// Language server protocol RPC request response message before it is deserialized into a concrete type.
203#[derive(Serialize, Deserialize)]
204struct AnyResponse<'a> {
205 jsonrpc: &'a str,
206 id: RequestId,
207 #[serde(default)]
208 error: Option<Error>,
209 #[serde(borrow)]
210 result: Option<&'a RawValue>,
211}
212
213/// Language server protocol RPC request response message.
214///
215/// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#responseMessage)
216#[derive(Serialize)]
217struct Response<T> {
218 jsonrpc: &'static str,
219 id: RequestId,
220 #[serde(flatten)]
221 value: LspResult<T>,
222}
223
224#[derive(Serialize)]
225#[serde(rename_all = "snake_case")]
226enum LspResult<T> {
227 #[serde(rename = "result")]
228 Ok(Option<T>),
229 Error(Option<Error>),
230}
231
232/// Language server protocol RPC notification message.
233///
234/// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#notificationMessage)
235#[derive(Serialize, Deserialize)]
236struct Notification<'a, T> {
237 jsonrpc: &'static str,
238 #[serde(borrow)]
239 method: &'a str,
240 params: T,
241}
242
243/// Language server RPC notification message before it is deserialized into a concrete type.
244#[derive(Debug, Clone, Deserialize)]
245struct AnyNotification {
246 #[serde(default)]
247 id: Option<RequestId>,
248 method: String,
249 #[serde(default)]
250 params: Option<Value>,
251}
252
253#[derive(Debug, Serialize, Deserialize)]
254struct Error {
255 message: String,
256}
257
258pub trait LspRequestFuture<O>: Future<Output = ConnectionResult<O>> {
259 fn id(&self) -> i32;
260}
261
262struct LspRequest<F> {
263 id: i32,
264 request: F,
265}
266
267impl<F> LspRequest<F> {
268 pub fn new(id: i32, request: F) -> Self {
269 Self { id, request }
270 }
271}
272
273impl<F: Future> Future for LspRequest<F> {
274 type Output = F::Output;
275
276 fn poll(self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
277 // SAFETY: This is standard pin projection, we're pinned so our fields must be pinned.
278 let inner = unsafe { Pin::new_unchecked(&mut self.get_unchecked_mut().request) };
279 inner.poll(cx)
280 }
281}
282
283impl<F, O> LspRequestFuture<O> for LspRequest<F>
284where
285 F: Future<Output = ConnectionResult<O>>,
286{
287 fn id(&self) -> i32 {
288 self.id
289 }
290}
291
292/// Combined capabilities of the server and the adapter.
293#[derive(Debug)]
294pub struct AdapterServerCapabilities {
295 // Reported capabilities by the server
296 pub server_capabilities: ServerCapabilities,
297 // List of code actions supported by the LspAdapter matching the server
298 pub code_action_kinds: Option<Vec<CodeActionKind>>,
299}
300
301impl LanguageServer {
302 /// Starts a language server process.
303 pub fn new(
304 stderr_capture: Arc<Mutex<Option<String>>>,
305 server_id: LanguageServerId,
306 server_name: LanguageServerName,
307 binary: LanguageServerBinary,
308 root_path: &Path,
309 code_action_kinds: Option<Vec<CodeActionKind>>,
310 workspace_folders: Arc<Mutex<BTreeSet<Url>>>,
311 cx: &mut AsyncApp,
312 ) -> Result<Self> {
313 let working_dir = if root_path.is_dir() {
314 root_path
315 } else {
316 root_path.parent().unwrap_or_else(|| Path::new("/"))
317 };
318
319 log::info!(
320 "starting language server process. binary path: {:?}, working directory: {:?}, args: {:?}",
321 binary.path,
322 working_dir,
323 &binary.arguments
324 );
325
326 let mut server = util::command::new_smol_command(&binary.path)
327 .current_dir(working_dir)
328 .args(&binary.arguments)
329 .envs(binary.env.clone().unwrap_or_default())
330 .stdin(Stdio::piped())
331 .stdout(Stdio::piped())
332 .stderr(Stdio::piped())
333 .kill_on_drop(true)
334 .spawn()
335 .with_context(|| {
336 format!(
337 "failed to spawn command. path: {:?}, working directory: {:?}, args: {:?}",
338 binary.path, working_dir, &binary.arguments
339 )
340 })?;
341
342 let stdin = server.stdin.take().unwrap();
343 let stdout = server.stdout.take().unwrap();
344 let stderr = server.stderr.take().unwrap();
345 let root_uri = Url::from_file_path(&working_dir)
346 .map_err(|()| anyhow!("{working_dir:?} is not a valid URI"))?;
347 let server = Self::new_internal(
348 server_id,
349 server_name,
350 stdin,
351 stdout,
352 Some(stderr),
353 stderr_capture,
354 Some(server),
355 code_action_kinds,
356 binary,
357 root_uri,
358 workspace_folders,
359 cx,
360 move |notification| {
361 log::info!(
362 "Language server with id {} sent unhandled notification {}:\n{}",
363 server_id,
364 notification.method,
365 serde_json::to_string_pretty(¬ification.params).unwrap(),
366 );
367 },
368 );
369
370 Ok(server)
371 }
372
373 fn new_internal<Stdin, Stdout, Stderr, F>(
374 server_id: LanguageServerId,
375 server_name: LanguageServerName,
376 stdin: Stdin,
377 stdout: Stdout,
378 stderr: Option<Stderr>,
379 stderr_capture: Arc<Mutex<Option<String>>>,
380 server: Option<Child>,
381 code_action_kinds: Option<Vec<CodeActionKind>>,
382 binary: LanguageServerBinary,
383 root_uri: Url,
384 workspace_folders: Arc<Mutex<BTreeSet<Url>>>,
385 cx: &mut AsyncApp,
386 on_unhandled_notification: F,
387 ) -> Self
388 where
389 Stdin: AsyncWrite + Unpin + Send + 'static,
390 Stdout: AsyncRead + Unpin + Send + 'static,
391 Stderr: AsyncRead + Unpin + Send + 'static,
392 F: FnMut(AnyNotification) + 'static + Send + Sync + Clone,
393 {
394 let (outbound_tx, outbound_rx) = channel::unbounded::<String>();
395 let (output_done_tx, output_done_rx) = barrier::channel();
396 let notification_handlers =
397 Arc::new(Mutex::new(HashMap::<_, NotificationHandler>::default()));
398 let response_handlers =
399 Arc::new(Mutex::new(Some(HashMap::<_, ResponseHandler>::default())));
400 let io_handlers = Arc::new(Mutex::new(HashMap::default()));
401
402 let stdout_input_task = cx.spawn({
403 let on_unhandled_notification = on_unhandled_notification.clone();
404 let notification_handlers = notification_handlers.clone();
405 let response_handlers = response_handlers.clone();
406 let io_handlers = io_handlers.clone();
407 async move |cx| {
408 Self::handle_input(
409 stdout,
410 on_unhandled_notification,
411 notification_handlers,
412 response_handlers,
413 io_handlers,
414 cx,
415 )
416 .log_err()
417 .await
418 }
419 });
420 let stderr_input_task = stderr
421 .map(|stderr| {
422 let io_handlers = io_handlers.clone();
423 let stderr_captures = stderr_capture.clone();
424 cx.spawn(async move |_| {
425 Self::handle_stderr(stderr, io_handlers, stderr_captures)
426 .log_err()
427 .await
428 })
429 })
430 .unwrap_or_else(|| Task::ready(None));
431 let input_task = cx.spawn(async move |_| {
432 let (stdout, stderr) = futures::join!(stdout_input_task, stderr_input_task);
433 stdout.or(stderr)
434 });
435 let output_task = cx.background_spawn({
436 Self::handle_output(
437 stdin,
438 outbound_rx,
439 output_done_tx,
440 response_handlers.clone(),
441 io_handlers.clone(),
442 )
443 .log_err()
444 });
445
446 let configuration = DidChangeConfigurationParams {
447 settings: Value::Null,
448 }
449 .into();
450
451 Self {
452 server_id,
453 notification_handlers,
454 response_handlers,
455 io_handlers,
456 name: server_name,
457 process_name: binary
458 .path
459 .file_name()
460 .map(|name| Arc::from(name.to_string_lossy()))
461 .unwrap_or_default(),
462 binary,
463 capabilities: Default::default(),
464 configuration,
465 code_action_kinds,
466 next_id: Default::default(),
467 outbound_tx,
468 executor: cx.background_executor().clone(),
469 io_tasks: Mutex::new(Some((input_task, output_task))),
470 output_done_rx: Mutex::new(Some(output_done_rx)),
471 server: Arc::new(Mutex::new(server)),
472 workspace_folders,
473 root_uri,
474 }
475 }
476
477 /// List of code action kinds this language server reports being able to emit.
478 pub fn code_action_kinds(&self) -> Option<Vec<CodeActionKind>> {
479 self.code_action_kinds.clone()
480 }
481
482 async fn handle_input<Stdout, F>(
483 stdout: Stdout,
484 mut on_unhandled_notification: F,
485 notification_handlers: Arc<Mutex<HashMap<&'static str, NotificationHandler>>>,
486 response_handlers: Arc<Mutex<Option<HashMap<RequestId, ResponseHandler>>>>,
487 io_handlers: Arc<Mutex<HashMap<i32, IoHandler>>>,
488 cx: &mut AsyncApp,
489 ) -> anyhow::Result<()>
490 where
491 Stdout: AsyncRead + Unpin + Send + 'static,
492 F: FnMut(AnyNotification) + 'static + Send,
493 {
494 use smol::stream::StreamExt;
495 let stdout = BufReader::new(stdout);
496 let _clear_response_handlers = util::defer({
497 let response_handlers = response_handlers.clone();
498 move || {
499 response_handlers.lock().take();
500 }
501 });
502 let mut input_handler = input_handler::LspStdoutHandler::new(
503 stdout,
504 response_handlers,
505 io_handlers,
506 cx.background_executor().clone(),
507 );
508
509 while let Some(msg) = input_handler.notifications_channel.next().await {
510 {
511 let mut notification_handlers = notification_handlers.lock();
512 if let Some(handler) = notification_handlers.get_mut(msg.method.as_str()) {
513 handler(msg.id, msg.params.unwrap_or(Value::Null), cx);
514 } else {
515 drop(notification_handlers);
516 on_unhandled_notification(msg);
517 }
518 }
519
520 // Don't starve the main thread when receiving lots of notifications at once.
521 smol::future::yield_now().await;
522 }
523 input_handler.loop_handle.await
524 }
525
526 async fn handle_stderr<Stderr>(
527 stderr: Stderr,
528 io_handlers: Arc<Mutex<HashMap<i32, IoHandler>>>,
529 stderr_capture: Arc<Mutex<Option<String>>>,
530 ) -> anyhow::Result<()>
531 where
532 Stderr: AsyncRead + Unpin + Send + 'static,
533 {
534 let mut stderr = BufReader::new(stderr);
535 let mut buffer = Vec::new();
536
537 loop {
538 buffer.clear();
539
540 let bytes_read = stderr.read_until(b'\n', &mut buffer).await?;
541 if bytes_read == 0 {
542 return Ok(());
543 }
544
545 if let Ok(message) = std::str::from_utf8(&buffer) {
546 log::trace!("incoming stderr message:{message}");
547 for handler in io_handlers.lock().values_mut() {
548 handler(IoKind::StdErr, message);
549 }
550
551 if let Some(stderr) = stderr_capture.lock().as_mut() {
552 stderr.push_str(message);
553 }
554 }
555
556 // Don't starve the main thread when receiving lots of messages at once.
557 smol::future::yield_now().await;
558 }
559 }
560
561 async fn handle_output<Stdin>(
562 stdin: Stdin,
563 outbound_rx: channel::Receiver<String>,
564 output_done_tx: barrier::Sender,
565 response_handlers: Arc<Mutex<Option<HashMap<RequestId, ResponseHandler>>>>,
566 io_handlers: Arc<Mutex<HashMap<i32, IoHandler>>>,
567 ) -> anyhow::Result<()>
568 where
569 Stdin: AsyncWrite + Unpin + Send + 'static,
570 {
571 let mut stdin = BufWriter::new(stdin);
572 let _clear_response_handlers = util::defer({
573 let response_handlers = response_handlers.clone();
574 move || {
575 response_handlers.lock().take();
576 }
577 });
578 let mut content_len_buffer = Vec::new();
579 while let Ok(message) = outbound_rx.recv().await {
580 log::trace!("outgoing message:{}", message);
581 for handler in io_handlers.lock().values_mut() {
582 handler(IoKind::StdIn, &message);
583 }
584
585 content_len_buffer.clear();
586 write!(content_len_buffer, "{}", message.len()).unwrap();
587 stdin.write_all(CONTENT_LEN_HEADER.as_bytes()).await?;
588 stdin.write_all(&content_len_buffer).await?;
589 stdin.write_all("\r\n\r\n".as_bytes()).await?;
590 stdin.write_all(message.as_bytes()).await?;
591 stdin.flush().await?;
592 }
593 drop(output_done_tx);
594 Ok(())
595 }
596
597 pub fn default_initialize_params(&self, pull_diagnostics: bool, cx: &App) -> InitializeParams {
598 let workspace_folders = self
599 .workspace_folders
600 .lock()
601 .iter()
602 .cloned()
603 .map(|uri| WorkspaceFolder {
604 name: Default::default(),
605 uri,
606 })
607 .collect::<Vec<_>>();
608 #[allow(deprecated)]
609 InitializeParams {
610 process_id: None,
611 root_path: None,
612 root_uri: Some(self.root_uri.clone()),
613 initialization_options: None,
614 capabilities: ClientCapabilities {
615 general: Some(GeneralClientCapabilities {
616 position_encodings: Some(vec![PositionEncodingKind::UTF16]),
617 ..Default::default()
618 }),
619 workspace: Some(WorkspaceClientCapabilities {
620 configuration: Some(true),
621 did_change_watched_files: Some(DidChangeWatchedFilesClientCapabilities {
622 dynamic_registration: Some(true),
623 relative_pattern_support: Some(true),
624 }),
625 did_change_configuration: Some(DynamicRegistrationClientCapabilities {
626 dynamic_registration: Some(true),
627 }),
628 workspace_folders: Some(true),
629 symbol: Some(WorkspaceSymbolClientCapabilities {
630 resolve_support: None,
631 ..WorkspaceSymbolClientCapabilities::default()
632 }),
633 inlay_hint: Some(InlayHintWorkspaceClientCapabilities {
634 refresh_support: Some(true),
635 }),
636 diagnostics: Some(DiagnosticWorkspaceClientCapabilities {
637 refresh_support: Some(true),
638 })
639 .filter(|_| pull_diagnostics),
640 code_lens: Some(CodeLensWorkspaceClientCapabilities {
641 refresh_support: Some(true),
642 }),
643 workspace_edit: Some(WorkspaceEditClientCapabilities {
644 resource_operations: Some(vec![
645 ResourceOperationKind::Create,
646 ResourceOperationKind::Rename,
647 ResourceOperationKind::Delete,
648 ]),
649 document_changes: Some(true),
650 snippet_edit_support: Some(true),
651 ..WorkspaceEditClientCapabilities::default()
652 }),
653 file_operations: Some(WorkspaceFileOperationsClientCapabilities {
654 dynamic_registration: Some(false),
655 did_rename: Some(true),
656 will_rename: Some(true),
657 ..Default::default()
658 }),
659 apply_edit: Some(true),
660 execute_command: Some(ExecuteCommandClientCapabilities {
661 dynamic_registration: Some(false),
662 }),
663 ..Default::default()
664 }),
665 text_document: Some(TextDocumentClientCapabilities {
666 definition: Some(GotoCapability {
667 link_support: Some(true),
668 dynamic_registration: None,
669 }),
670 code_action: Some(CodeActionClientCapabilities {
671 code_action_literal_support: Some(CodeActionLiteralSupport {
672 code_action_kind: CodeActionKindLiteralSupport {
673 value_set: vec![
674 CodeActionKind::REFACTOR.as_str().into(),
675 CodeActionKind::QUICKFIX.as_str().into(),
676 CodeActionKind::SOURCE.as_str().into(),
677 ],
678 },
679 }),
680 data_support: Some(true),
681 resolve_support: Some(CodeActionCapabilityResolveSupport {
682 properties: vec![
683 "kind".to_string(),
684 "diagnostics".to_string(),
685 "isPreferred".to_string(),
686 "disabled".to_string(),
687 "edit".to_string(),
688 "command".to_string(),
689 ],
690 }),
691 ..Default::default()
692 }),
693 completion: Some(CompletionClientCapabilities {
694 completion_item: Some(CompletionItemCapability {
695 snippet_support: Some(true),
696 resolve_support: Some(CompletionItemCapabilityResolveSupport {
697 properties: vec![
698 "additionalTextEdits".to_string(),
699 "command".to_string(),
700 "documentation".to_string(),
701 // NB: Do not have this resolved, otherwise Zed becomes slow to complete things
702 // "textEdit".to_string(),
703 ],
704 }),
705 insert_replace_support: Some(true),
706 label_details_support: Some(true),
707 insert_text_mode_support: Some(InsertTextModeSupport {
708 value_set: vec![
709 InsertTextMode::AS_IS,
710 InsertTextMode::ADJUST_INDENTATION,
711 ],
712 }),
713 ..Default::default()
714 }),
715 insert_text_mode: Some(InsertTextMode::ADJUST_INDENTATION),
716 completion_list: Some(CompletionListCapability {
717 item_defaults: Some(vec![
718 "commitCharacters".to_owned(),
719 "editRange".to_owned(),
720 "insertTextMode".to_owned(),
721 "insertTextFormat".to_owned(),
722 "data".to_owned(),
723 ]),
724 }),
725 context_support: Some(true),
726 ..Default::default()
727 }),
728 rename: Some(RenameClientCapabilities {
729 prepare_support: Some(true),
730 prepare_support_default_behavior: Some(
731 PrepareSupportDefaultBehavior::IDENTIFIER,
732 ),
733 ..Default::default()
734 }),
735 hover: Some(HoverClientCapabilities {
736 content_format: Some(vec![MarkupKind::Markdown]),
737 dynamic_registration: None,
738 }),
739 inlay_hint: Some(InlayHintClientCapabilities {
740 resolve_support: Some(InlayHintResolveClientCapabilities {
741 properties: vec![
742 "textEdits".to_string(),
743 "tooltip".to_string(),
744 "label.tooltip".to_string(),
745 "label.location".to_string(),
746 "label.command".to_string(),
747 ],
748 }),
749 dynamic_registration: Some(false),
750 }),
751 publish_diagnostics: Some(PublishDiagnosticsClientCapabilities {
752 related_information: Some(true),
753 version_support: Some(true),
754 data_support: Some(true),
755 tag_support: Some(TagSupport {
756 value_set: vec![DiagnosticTag::UNNECESSARY, DiagnosticTag::DEPRECATED],
757 }),
758 code_description_support: Some(true),
759 }),
760 formatting: Some(DynamicRegistrationClientCapabilities {
761 dynamic_registration: Some(true),
762 }),
763 range_formatting: Some(DynamicRegistrationClientCapabilities {
764 dynamic_registration: Some(true),
765 }),
766 on_type_formatting: Some(DynamicRegistrationClientCapabilities {
767 dynamic_registration: Some(true),
768 }),
769 signature_help: Some(SignatureHelpClientCapabilities {
770 signature_information: Some(SignatureInformationSettings {
771 documentation_format: Some(vec![
772 MarkupKind::Markdown,
773 MarkupKind::PlainText,
774 ]),
775 parameter_information: Some(ParameterInformationSettings {
776 label_offset_support: Some(true),
777 }),
778 active_parameter_support: Some(true),
779 }),
780 ..SignatureHelpClientCapabilities::default()
781 }),
782 synchronization: Some(TextDocumentSyncClientCapabilities {
783 did_save: Some(true),
784 ..TextDocumentSyncClientCapabilities::default()
785 }),
786 code_lens: Some(CodeLensClientCapabilities {
787 dynamic_registration: Some(false),
788 }),
789 document_symbol: Some(DocumentSymbolClientCapabilities {
790 hierarchical_document_symbol_support: Some(true),
791 ..DocumentSymbolClientCapabilities::default()
792 }),
793 diagnostic: Some(DiagnosticClientCapabilities {
794 dynamic_registration: Some(false),
795 related_document_support: Some(true),
796 })
797 .filter(|_| pull_diagnostics),
798 color_provider: Some(DocumentColorClientCapabilities {
799 dynamic_registration: Some(false),
800 }),
801 ..TextDocumentClientCapabilities::default()
802 }),
803 experimental: Some(json!({
804 "serverStatusNotification": true,
805 "localDocs": true,
806 })),
807 window: Some(WindowClientCapabilities {
808 work_done_progress: Some(true),
809 show_message: Some(ShowMessageRequestClientCapabilities {
810 message_action_item: None,
811 }),
812 ..Default::default()
813 }),
814 },
815 trace: None,
816 workspace_folders: Some(workspace_folders),
817 client_info: release_channel::ReleaseChannel::try_global(cx).map(|release_channel| {
818 ClientInfo {
819 name: release_channel.display_name().to_string(),
820 version: Some(release_channel::AppVersion::global(cx).to_string()),
821 }
822 }),
823 locale: None,
824
825 ..Default::default()
826 }
827 }
828
829 /// Initializes a language server by sending the `Initialize` request.
830 /// Note that `options` is used directly to construct [`InitializeParams`], which is why it is owned.
831 ///
832 /// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initialize)
833 pub fn initialize(
834 mut self,
835 params: InitializeParams,
836 configuration: Arc<DidChangeConfigurationParams>,
837 cx: &App,
838 ) -> Task<Result<Arc<Self>>> {
839 cx.spawn(async move |_| {
840 let response = self
841 .request::<request::Initialize>(params)
842 .await
843 .into_response()
844 .with_context(|| {
845 format!(
846 "initializing server {}, id {}",
847 self.name(),
848 self.server_id()
849 )
850 })?;
851 if let Some(info) = response.server_info {
852 self.process_name = info.name.into();
853 }
854 self.capabilities = RwLock::new(response.capabilities);
855 self.configuration = configuration;
856
857 self.notify::<notification::Initialized>(&InitializedParams {})?;
858 Ok(Arc::new(self))
859 })
860 }
861
862 /// Sends a shutdown request to the language server process and prepares the [`LanguageServer`] to be dropped.
863 pub fn shutdown(&self) -> Option<impl 'static + Send + Future<Output = Option<()>> + use<>> {
864 if let Some(tasks) = self.io_tasks.lock().take() {
865 let response_handlers = self.response_handlers.clone();
866 let next_id = AtomicI32::new(self.next_id.load(SeqCst));
867 let outbound_tx = self.outbound_tx.clone();
868 let executor = self.executor.clone();
869 let mut output_done = self.output_done_rx.lock().take().unwrap();
870 let shutdown_request = Self::request_internal::<request::Shutdown>(
871 &next_id,
872 &response_handlers,
873 &outbound_tx,
874 &executor,
875 (),
876 );
877
878 let server = self.server.clone();
879 let name = self.name.clone();
880 let mut timer = self.executor.timer(SERVER_SHUTDOWN_TIMEOUT).fuse();
881 Some(
882 async move {
883 log::debug!("language server shutdown started");
884
885 select! {
886 request_result = shutdown_request.fuse() => {
887 match request_result {
888 ConnectionResult::Timeout => {
889 log::warn!("timeout waiting for language server {name} to shutdown");
890 },
891 ConnectionResult::ConnectionReset => {},
892 ConnectionResult::Result(r) => r?,
893 }
894 }
895
896 _ = timer => {
897 log::info!("timeout waiting for language server {name} to shutdown");
898 },
899 }
900
901 response_handlers.lock().take();
902 Self::notify_internal::<notification::Exit>(&outbound_tx, &()).ok();
903 outbound_tx.close();
904 output_done.recv().await;
905 server.lock().take().map(|mut child| child.kill());
906 log::debug!("language server shutdown finished");
907
908 drop(tasks);
909 anyhow::Ok(())
910 }
911 .log_err(),
912 )
913 } else {
914 None
915 }
916 }
917
918 /// Register a handler to handle incoming LSP notifications.
919 ///
920 /// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#notificationMessage)
921 #[must_use]
922 pub fn on_notification<T, F>(&self, f: F) -> Subscription
923 where
924 T: notification::Notification,
925 F: 'static + Send + FnMut(T::Params, &mut AsyncApp),
926 {
927 self.on_custom_notification(T::METHOD, f)
928 }
929
930 /// Register a handler to handle incoming LSP requests.
931 ///
932 /// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#requestMessage)
933 #[must_use]
934 pub fn on_request<T, F, Fut>(&self, f: F) -> Subscription
935 where
936 T: request::Request,
937 T::Params: 'static + Send,
938 F: 'static + FnMut(T::Params, &mut AsyncApp) -> Fut + Send,
939 Fut: 'static + Future<Output = Result<T::Result>>,
940 {
941 self.on_custom_request(T::METHOD, f)
942 }
943
944 /// Registers a handler to inspect all language server process stdio.
945 #[must_use]
946 pub fn on_io<F>(&self, f: F) -> Subscription
947 where
948 F: 'static + Send + FnMut(IoKind, &str),
949 {
950 let id = self.next_id.fetch_add(1, SeqCst);
951 self.io_handlers.lock().insert(id, Box::new(f));
952 Subscription::Io {
953 id,
954 io_handlers: Some(Arc::downgrade(&self.io_handlers)),
955 }
956 }
957
958 /// Removes a request handler registers via [`Self::on_request`].
959 pub fn remove_request_handler<T: request::Request>(&self) {
960 self.notification_handlers.lock().remove(T::METHOD);
961 }
962
963 /// Removes a notification handler registers via [`Self::on_notification`].
964 pub fn remove_notification_handler<T: notification::Notification>(&self) {
965 self.notification_handlers.lock().remove(T::METHOD);
966 }
967
968 /// Checks if a notification handler has been registered via [`Self::on_notification`].
969 pub fn has_notification_handler<T: notification::Notification>(&self) -> bool {
970 self.notification_handlers.lock().contains_key(T::METHOD)
971 }
972
973 #[must_use]
974 fn on_custom_notification<Params, F>(&self, method: &'static str, mut f: F) -> Subscription
975 where
976 F: 'static + FnMut(Params, &mut AsyncApp) + Send,
977 Params: DeserializeOwned,
978 {
979 let prev_handler = self.notification_handlers.lock().insert(
980 method,
981 Box::new(move |_, params, cx| {
982 if let Some(params) = serde_json::from_value(params).log_err() {
983 f(params, cx);
984 }
985 }),
986 );
987 assert!(
988 prev_handler.is_none(),
989 "registered multiple handlers for the same LSP method"
990 );
991 Subscription::Notification {
992 method,
993 notification_handlers: Some(self.notification_handlers.clone()),
994 }
995 }
996
997 #[must_use]
998 fn on_custom_request<Params, Res, Fut, F>(&self, method: &'static str, mut f: F) -> Subscription
999 where
1000 F: 'static + FnMut(Params, &mut AsyncApp) -> Fut + Send,
1001 Fut: 'static + Future<Output = Result<Res>>,
1002 Params: DeserializeOwned + Send + 'static,
1003 Res: Serialize,
1004 {
1005 let outbound_tx = self.outbound_tx.clone();
1006 let prev_handler = self.notification_handlers.lock().insert(
1007 method,
1008 Box::new(move |id, params, cx| {
1009 if let Some(id) = id {
1010 match serde_json::from_value(params) {
1011 Ok(params) => {
1012 let response = f(params, cx);
1013 cx.foreground_executor()
1014 .spawn({
1015 let outbound_tx = outbound_tx.clone();
1016 async move {
1017 let response = match response.await {
1018 Ok(result) => Response {
1019 jsonrpc: JSON_RPC_VERSION,
1020 id,
1021 value: LspResult::Ok(Some(result)),
1022 },
1023 Err(error) => Response {
1024 jsonrpc: JSON_RPC_VERSION,
1025 id,
1026 value: LspResult::Error(Some(Error {
1027 message: error.to_string(),
1028 })),
1029 },
1030 };
1031 if let Some(response) =
1032 serde_json::to_string(&response).log_err()
1033 {
1034 outbound_tx.try_send(response).ok();
1035 }
1036 }
1037 })
1038 .detach();
1039 }
1040
1041 Err(error) => {
1042 log::error!("error deserializing {} request: {:?}", method, error);
1043 let response = AnyResponse {
1044 jsonrpc: JSON_RPC_VERSION,
1045 id,
1046 result: None,
1047 error: Some(Error {
1048 message: error.to_string(),
1049 }),
1050 };
1051 if let Some(response) = serde_json::to_string(&response).log_err() {
1052 outbound_tx.try_send(response).ok();
1053 }
1054 }
1055 }
1056 }
1057 }),
1058 );
1059 assert!(
1060 prev_handler.is_none(),
1061 "registered multiple handlers for the same LSP method"
1062 );
1063 Subscription::Notification {
1064 method,
1065 notification_handlers: Some(self.notification_handlers.clone()),
1066 }
1067 }
1068
1069 /// Get the name of the running language server.
1070 pub fn name(&self) -> LanguageServerName {
1071 self.name.clone()
1072 }
1073
1074 pub fn process_name(&self) -> &str {
1075 &self.process_name
1076 }
1077
1078 /// Get the reported capabilities of the running language server.
1079 pub fn capabilities(&self) -> ServerCapabilities {
1080 self.capabilities.read().clone()
1081 }
1082
1083 /// Get the reported capabilities of the running language server and
1084 /// what we know on the client/adapter-side of its capabilities.
1085 pub fn adapter_server_capabilities(&self) -> AdapterServerCapabilities {
1086 AdapterServerCapabilities {
1087 server_capabilities: self.capabilities(),
1088 code_action_kinds: self.code_action_kinds(),
1089 }
1090 }
1091
1092 pub fn update_capabilities(&self, update: impl FnOnce(&mut ServerCapabilities)) {
1093 update(self.capabilities.write().deref_mut());
1094 }
1095
1096 pub fn configuration(&self) -> &Value {
1097 &self.configuration.settings
1098 }
1099
1100 /// Get the id of the running language server.
1101 pub fn server_id(&self) -> LanguageServerId {
1102 self.server_id
1103 }
1104
1105 /// Language server's binary information.
1106 pub fn binary(&self) -> &LanguageServerBinary {
1107 &self.binary
1108 }
1109
1110 /// Sends a RPC request to the language server.
1111 ///
1112 /// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#requestMessage)
1113 pub fn request<T: request::Request>(
1114 &self,
1115 params: T::Params,
1116 ) -> impl LspRequestFuture<T::Result> + use<T>
1117 where
1118 T::Result: 'static + Send,
1119 {
1120 Self::request_internal::<T>(
1121 &self.next_id,
1122 &self.response_handlers,
1123 &self.outbound_tx,
1124 &self.executor,
1125 params,
1126 )
1127 }
1128
1129 /// Sends a RPC request to the language server, with a custom timer, a future which when becoming
1130 /// ready causes the request to be timed out with the future's output message.
1131 ///
1132 /// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#requestMessage)
1133 pub fn request_with_timer<T: request::Request, U: Future<Output = String>>(
1134 &self,
1135 params: T::Params,
1136 timer: U,
1137 ) -> impl LspRequestFuture<T::Result> + use<T, U>
1138 where
1139 T::Result: 'static + Send,
1140 {
1141 Self::request_internal_with_timer::<T, U>(
1142 &self.next_id,
1143 &self.response_handlers,
1144 &self.outbound_tx,
1145 &self.executor,
1146 timer,
1147 params,
1148 )
1149 }
1150
1151 fn request_internal_with_timer<T, U>(
1152 next_id: &AtomicI32,
1153 response_handlers: &Mutex<Option<HashMap<RequestId, ResponseHandler>>>,
1154 outbound_tx: &channel::Sender<String>,
1155 executor: &BackgroundExecutor,
1156 timer: U,
1157 params: T::Params,
1158 ) -> impl LspRequestFuture<T::Result> + use<T, U>
1159 where
1160 T::Result: 'static + Send,
1161 T: request::Request,
1162 U: Future<Output = String>,
1163 {
1164 let id = next_id.fetch_add(1, SeqCst);
1165 let message = serde_json::to_string(&Request {
1166 jsonrpc: JSON_RPC_VERSION,
1167 id: RequestId::Int(id),
1168 method: T::METHOD,
1169 params,
1170 })
1171 .unwrap();
1172
1173 let (tx, rx) = oneshot::channel();
1174 let handle_response = response_handlers
1175 .lock()
1176 .as_mut()
1177 .context("server shut down")
1178 .map(|handlers| {
1179 let executor = executor.clone();
1180 handlers.insert(
1181 RequestId::Int(id),
1182 Box::new(move |result| {
1183 executor
1184 .spawn(async move {
1185 let response = match result {
1186 Ok(response) => match serde_json::from_str(&response) {
1187 Ok(deserialized) => Ok(deserialized),
1188 Err(error) => {
1189 log::error!("failed to deserialize response from language server: {}. response from language server: {:?}", error, response);
1190 Err(error).context("failed to deserialize response")
1191 }
1192 }
1193 Err(error) => Err(anyhow!("{}", error.message)),
1194 };
1195 _ = tx.send(response);
1196 })
1197 .detach();
1198 }),
1199 );
1200 });
1201
1202 let send = outbound_tx
1203 .try_send(message)
1204 .context("failed to write to language server's stdin");
1205
1206 let outbound_tx = outbound_tx.downgrade();
1207 let started = Instant::now();
1208 LspRequest::new(id, async move {
1209 if let Err(e) = handle_response {
1210 return ConnectionResult::Result(Err(e));
1211 }
1212 if let Err(e) = send {
1213 return ConnectionResult::Result(Err(e));
1214 }
1215
1216 let cancel_on_drop = util::defer(move || {
1217 if let Some(outbound_tx) = outbound_tx.upgrade() {
1218 Self::notify_internal::<notification::Cancel>(
1219 &outbound_tx,
1220 &CancelParams {
1221 id: NumberOrString::Number(id),
1222 },
1223 )
1224 .ok();
1225 }
1226 });
1227
1228 let method = T::METHOD;
1229 select! {
1230 response = rx.fuse() => {
1231 let elapsed = started.elapsed();
1232 log::trace!("Took {elapsed:?} to receive response to {method:?} id {id}");
1233 cancel_on_drop.abort();
1234 match response {
1235 Ok(response_result) => ConnectionResult::Result(response_result),
1236 Err(Canceled) => {
1237 log::error!("Server reset connection for a request {method:?} id {id}");
1238 ConnectionResult::ConnectionReset
1239 },
1240 }
1241 }
1242
1243 message = timer.fuse() => {
1244 log::error!("Cancelled LSP request task for {method:?} id {id} {message}");
1245 ConnectionResult::Timeout
1246 }
1247 }
1248 })
1249 }
1250
1251 fn request_internal<T>(
1252 next_id: &AtomicI32,
1253 response_handlers: &Mutex<Option<HashMap<RequestId, ResponseHandler>>>,
1254 outbound_tx: &channel::Sender<String>,
1255 executor: &BackgroundExecutor,
1256 params: T::Params,
1257 ) -> impl LspRequestFuture<T::Result> + use<T>
1258 where
1259 T::Result: 'static + Send,
1260 T: request::Request,
1261 {
1262 Self::request_internal_with_timer::<T, _>(
1263 next_id,
1264 response_handlers,
1265 outbound_tx,
1266 executor,
1267 Self::default_request_timer(executor.clone()),
1268 params,
1269 )
1270 }
1271
1272 pub fn default_request_timer(executor: BackgroundExecutor) -> impl Future<Output = String> {
1273 executor
1274 .timer(LSP_REQUEST_TIMEOUT)
1275 .map(|_| format!("which took over {LSP_REQUEST_TIMEOUT:?}"))
1276 }
1277
1278 /// Sends a RPC notification to the language server.
1279 ///
1280 /// [LSP Specification](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#notificationMessage)
1281 pub fn notify<T: notification::Notification>(&self, params: &T::Params) -> Result<()> {
1282 Self::notify_internal::<T>(&self.outbound_tx, params)
1283 }
1284
1285 fn notify_internal<T: notification::Notification>(
1286 outbound_tx: &channel::Sender<String>,
1287 params: &T::Params,
1288 ) -> Result<()> {
1289 let message = serde_json::to_string(&Notification {
1290 jsonrpc: JSON_RPC_VERSION,
1291 method: T::METHOD,
1292 params,
1293 })
1294 .unwrap();
1295 outbound_tx.try_send(message)?;
1296 Ok(())
1297 }
1298
1299 /// Add new workspace folder to the list.
1300 pub fn add_workspace_folder(&self, uri: Url) {
1301 if self
1302 .capabilities()
1303 .workspace
1304 .and_then(|ws| {
1305 ws.workspace_folders.and_then(|folders| {
1306 folders
1307 .change_notifications
1308 .map(|caps| matches!(caps, OneOf::Left(false)))
1309 })
1310 })
1311 .unwrap_or(true)
1312 {
1313 return;
1314 }
1315
1316 let is_new_folder = self.workspace_folders.lock().insert(uri.clone());
1317 if is_new_folder {
1318 let params = DidChangeWorkspaceFoldersParams {
1319 event: WorkspaceFoldersChangeEvent {
1320 added: vec![WorkspaceFolder {
1321 uri,
1322 name: String::default(),
1323 }],
1324 removed: vec![],
1325 },
1326 };
1327 self.notify::<DidChangeWorkspaceFolders>(¶ms).ok();
1328 }
1329 }
1330 /// Add new workspace folder to the list.
1331 pub fn remove_workspace_folder(&self, uri: Url) {
1332 if self
1333 .capabilities()
1334 .workspace
1335 .and_then(|ws| {
1336 ws.workspace_folders.and_then(|folders| {
1337 folders
1338 .change_notifications
1339 .map(|caps| !matches!(caps, OneOf::Left(false)))
1340 })
1341 })
1342 .unwrap_or(true)
1343 {
1344 return;
1345 }
1346 let was_removed = self.workspace_folders.lock().remove(&uri);
1347 if was_removed {
1348 let params = DidChangeWorkspaceFoldersParams {
1349 event: WorkspaceFoldersChangeEvent {
1350 added: vec![],
1351 removed: vec![WorkspaceFolder {
1352 uri,
1353 name: String::default(),
1354 }],
1355 },
1356 };
1357 self.notify::<DidChangeWorkspaceFolders>(¶ms).ok();
1358 }
1359 }
1360 pub fn set_workspace_folders(&self, folders: BTreeSet<Url>) {
1361 let mut workspace_folders = self.workspace_folders.lock();
1362
1363 let old_workspace_folders = std::mem::take(&mut *workspace_folders);
1364 let added: Vec<_> = folders
1365 .difference(&old_workspace_folders)
1366 .map(|uri| WorkspaceFolder {
1367 uri: uri.clone(),
1368 name: String::default(),
1369 })
1370 .collect();
1371
1372 let removed: Vec<_> = old_workspace_folders
1373 .difference(&folders)
1374 .map(|uri| WorkspaceFolder {
1375 uri: uri.clone(),
1376 name: String::default(),
1377 })
1378 .collect();
1379 *workspace_folders = folders;
1380 let should_notify = !added.is_empty() || !removed.is_empty();
1381 if should_notify {
1382 drop(workspace_folders);
1383 let params = DidChangeWorkspaceFoldersParams {
1384 event: WorkspaceFoldersChangeEvent { added, removed },
1385 };
1386 self.notify::<DidChangeWorkspaceFolders>(¶ms).ok();
1387 }
1388 }
1389
1390 pub fn workspace_folders(&self) -> impl Deref<Target = BTreeSet<Url>> + '_ {
1391 self.workspace_folders.lock()
1392 }
1393
1394 pub fn register_buffer(
1395 &self,
1396 uri: Url,
1397 language_id: String,
1398 version: i32,
1399 initial_text: String,
1400 ) {
1401 self.notify::<notification::DidOpenTextDocument>(&DidOpenTextDocumentParams {
1402 text_document: TextDocumentItem::new(uri, language_id, version, initial_text),
1403 })
1404 .ok();
1405 }
1406
1407 pub fn unregister_buffer(&self, uri: Url) {
1408 self.notify::<notification::DidCloseTextDocument>(&DidCloseTextDocumentParams {
1409 text_document: TextDocumentIdentifier::new(uri),
1410 })
1411 .ok();
1412 }
1413}
1414
1415impl Drop for LanguageServer {
1416 fn drop(&mut self) {
1417 if let Some(shutdown) = self.shutdown() {
1418 self.executor.spawn(shutdown).detach();
1419 }
1420 }
1421}
1422
1423impl Subscription {
1424 /// Detaching a subscription handle prevents it from unsubscribing on drop.
1425 pub fn detach(&mut self) {
1426 match self {
1427 Subscription::Notification {
1428 notification_handlers,
1429 ..
1430 } => *notification_handlers = None,
1431 Subscription::Io { io_handlers, .. } => *io_handlers = None,
1432 }
1433 }
1434}
1435
1436impl fmt::Display for LanguageServerId {
1437 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1438 self.0.fmt(f)
1439 }
1440}
1441
1442impl fmt::Debug for LanguageServer {
1443 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1444 f.debug_struct("LanguageServer")
1445 .field("id", &self.server_id.0)
1446 .field("name", &self.name)
1447 .finish_non_exhaustive()
1448 }
1449}
1450
1451impl Drop for Subscription {
1452 fn drop(&mut self) {
1453 match self {
1454 Subscription::Notification {
1455 method,
1456 notification_handlers,
1457 } => {
1458 if let Some(handlers) = notification_handlers {
1459 handlers.lock().remove(method);
1460 }
1461 }
1462 Subscription::Io { id, io_handlers } => {
1463 if let Some(io_handlers) = io_handlers.as_ref().and_then(|h| h.upgrade()) {
1464 io_handlers.lock().remove(id);
1465 }
1466 }
1467 }
1468 }
1469}
1470
1471/// Mock language server for use in tests.
1472#[cfg(any(test, feature = "test-support"))]
1473#[derive(Clone)]
1474pub struct FakeLanguageServer {
1475 pub binary: LanguageServerBinary,
1476 pub server: Arc<LanguageServer>,
1477 notifications_rx: channel::Receiver<(String, String)>,
1478}
1479
1480#[cfg(any(test, feature = "test-support"))]
1481impl FakeLanguageServer {
1482 /// Construct a fake language server.
1483 pub fn new(
1484 server_id: LanguageServerId,
1485 binary: LanguageServerBinary,
1486 name: String,
1487 capabilities: ServerCapabilities,
1488 cx: &mut AsyncApp,
1489 ) -> (LanguageServer, FakeLanguageServer) {
1490 let (stdin_writer, stdin_reader) = async_pipe::pipe();
1491 let (stdout_writer, stdout_reader) = async_pipe::pipe();
1492 let (notifications_tx, notifications_rx) = channel::unbounded();
1493
1494 let server_name = LanguageServerName(name.clone().into());
1495 let process_name = Arc::from(name.as_str());
1496 let root = Self::root_path();
1497 let workspace_folders: Arc<Mutex<BTreeSet<Url>>> = Default::default();
1498 let mut server = LanguageServer::new_internal(
1499 server_id,
1500 server_name.clone(),
1501 stdin_writer,
1502 stdout_reader,
1503 None::<async_pipe::PipeReader>,
1504 Arc::new(Mutex::new(None)),
1505 None,
1506 None,
1507 binary.clone(),
1508 root,
1509 workspace_folders.clone(),
1510 cx,
1511 |_| {},
1512 );
1513 server.process_name = process_name;
1514 let fake = FakeLanguageServer {
1515 binary: binary.clone(),
1516 server: Arc::new({
1517 let mut server = LanguageServer::new_internal(
1518 server_id,
1519 server_name,
1520 stdout_writer,
1521 stdin_reader,
1522 None::<async_pipe::PipeReader>,
1523 Arc::new(Mutex::new(None)),
1524 None,
1525 None,
1526 binary,
1527 Self::root_path(),
1528 workspace_folders,
1529 cx,
1530 move |msg| {
1531 notifications_tx
1532 .try_send((
1533 msg.method.to_string(),
1534 msg.params.unwrap_or(Value::Null).to_string(),
1535 ))
1536 .ok();
1537 },
1538 );
1539 server.process_name = name.as_str().into();
1540 server
1541 }),
1542 notifications_rx,
1543 };
1544 fake.set_request_handler::<request::Initialize, _, _>({
1545 let capabilities = capabilities;
1546 move |_, _| {
1547 let capabilities = capabilities.clone();
1548 let name = name.clone();
1549 async move {
1550 Ok(InitializeResult {
1551 capabilities,
1552 server_info: Some(ServerInfo {
1553 name,
1554 ..Default::default()
1555 }),
1556 })
1557 }
1558 }
1559 });
1560
1561 fake.set_request_handler::<request::Shutdown, _, _>(|_, _| async move { Ok(()) });
1562
1563 (server, fake)
1564 }
1565 #[cfg(target_os = "windows")]
1566 fn root_path() -> Url {
1567 Url::from_file_path("C:/").unwrap()
1568 }
1569
1570 #[cfg(not(target_os = "windows"))]
1571 fn root_path() -> Url {
1572 Url::from_file_path("/").unwrap()
1573 }
1574}
1575
1576#[cfg(any(test, feature = "test-support"))]
1577impl LanguageServer {
1578 pub fn full_capabilities() -> ServerCapabilities {
1579 ServerCapabilities {
1580 document_highlight_provider: Some(OneOf::Left(true)),
1581 code_action_provider: Some(CodeActionProviderCapability::Simple(true)),
1582 document_formatting_provider: Some(OneOf::Left(true)),
1583 document_range_formatting_provider: Some(OneOf::Left(true)),
1584 definition_provider: Some(OneOf::Left(true)),
1585 workspace_symbol_provider: Some(OneOf::Left(true)),
1586 implementation_provider: Some(ImplementationProviderCapability::Simple(true)),
1587 type_definition_provider: Some(TypeDefinitionProviderCapability::Simple(true)),
1588 ..Default::default()
1589 }
1590 }
1591}
1592
1593#[cfg(any(test, feature = "test-support"))]
1594impl FakeLanguageServer {
1595 /// See [`LanguageServer::notify`].
1596 pub fn notify<T: notification::Notification>(&self, params: &T::Params) {
1597 self.server.notify::<T>(params).ok();
1598 }
1599
1600 /// See [`LanguageServer::request`].
1601 pub async fn request<T>(&self, params: T::Params) -> ConnectionResult<T::Result>
1602 where
1603 T: request::Request,
1604 T::Result: 'static + Send,
1605 {
1606 self.server.executor.start_waiting();
1607 self.server.request::<T>(params).await
1608 }
1609
1610 /// Attempts [`Self::try_receive_notification`], unwrapping if it has not received the specified type yet.
1611 pub async fn receive_notification<T: notification::Notification>(&mut self) -> T::Params {
1612 self.server.executor.start_waiting();
1613 self.try_receive_notification::<T>().await.unwrap()
1614 }
1615
1616 /// Consumes the notification channel until it finds a notification for the specified type.
1617 pub async fn try_receive_notification<T: notification::Notification>(
1618 &mut self,
1619 ) -> Option<T::Params> {
1620 loop {
1621 let (method, params) = self.notifications_rx.recv().await.ok()?;
1622 if method == T::METHOD {
1623 return Some(serde_json::from_str::<T::Params>(¶ms).unwrap());
1624 } else {
1625 log::info!("skipping message in fake language server {:?}", params);
1626 }
1627 }
1628 }
1629
1630 /// Registers a handler for a specific kind of request. Removes any existing handler for specified request type.
1631 pub fn set_request_handler<T, F, Fut>(
1632 &self,
1633 mut handler: F,
1634 ) -> futures::channel::mpsc::UnboundedReceiver<()>
1635 where
1636 T: 'static + request::Request,
1637 T::Params: 'static + Send,
1638 F: 'static + Send + FnMut(T::Params, gpui::AsyncApp) -> Fut,
1639 Fut: 'static + Future<Output = Result<T::Result>>,
1640 {
1641 let (responded_tx, responded_rx) = futures::channel::mpsc::unbounded();
1642 self.server.remove_request_handler::<T>();
1643 self.server
1644 .on_request::<T, _, _>(move |params, cx| {
1645 let result = handler(params, cx.clone());
1646 let responded_tx = responded_tx.clone();
1647 let executor = cx.background_executor().clone();
1648 async move {
1649 executor.simulate_random_delay().await;
1650 let result = result.await;
1651 responded_tx.unbounded_send(()).ok();
1652 result
1653 }
1654 })
1655 .detach();
1656 responded_rx
1657 }
1658
1659 /// Registers a handler for a specific kind of notification. Removes any existing handler for specified notification type.
1660 pub fn handle_notification<T, F>(
1661 &self,
1662 mut handler: F,
1663 ) -> futures::channel::mpsc::UnboundedReceiver<()>
1664 where
1665 T: 'static + notification::Notification,
1666 T::Params: 'static + Send,
1667 F: 'static + Send + FnMut(T::Params, gpui::AsyncApp),
1668 {
1669 let (handled_tx, handled_rx) = futures::channel::mpsc::unbounded();
1670 self.server.remove_notification_handler::<T>();
1671 self.server
1672 .on_notification::<T, _>(move |params, cx| {
1673 handler(params, cx.clone());
1674 handled_tx.unbounded_send(()).ok();
1675 })
1676 .detach();
1677 handled_rx
1678 }
1679
1680 /// Removes any existing handler for specified notification type.
1681 pub fn remove_request_handler<T>(&mut self)
1682 where
1683 T: 'static + request::Request,
1684 {
1685 self.server.remove_request_handler::<T>();
1686 }
1687
1688 /// Simulate that the server has started work and notifies about its progress with the specified token.
1689 pub async fn start_progress(&self, token: impl Into<String>) {
1690 self.start_progress_with(token, Default::default()).await
1691 }
1692
1693 pub async fn start_progress_with(
1694 &self,
1695 token: impl Into<String>,
1696 progress: WorkDoneProgressBegin,
1697 ) {
1698 let token = token.into();
1699 self.request::<request::WorkDoneProgressCreate>(WorkDoneProgressCreateParams {
1700 token: NumberOrString::String(token.clone()),
1701 })
1702 .await
1703 .into_response()
1704 .unwrap();
1705 self.notify::<notification::Progress>(&ProgressParams {
1706 token: NumberOrString::String(token),
1707 value: ProgressParamsValue::WorkDone(WorkDoneProgress::Begin(progress)),
1708 });
1709 }
1710
1711 /// Simulate that the server has completed work and notifies about that with the specified token.
1712 pub fn end_progress(&self, token: impl Into<String>) {
1713 self.notify::<notification::Progress>(&ProgressParams {
1714 token: NumberOrString::String(token.into()),
1715 value: ProgressParamsValue::WorkDone(WorkDoneProgress::End(Default::default())),
1716 });
1717 }
1718}
1719
1720#[cfg(test)]
1721mod tests {
1722 use super::*;
1723 use gpui::{SemanticVersion, TestAppContext};
1724 use std::str::FromStr;
1725
1726 #[ctor::ctor]
1727 fn init_logger() {
1728 zlog::init_test();
1729 }
1730
1731 #[gpui::test]
1732 async fn test_fake(cx: &mut TestAppContext) {
1733 cx.update(|cx| {
1734 release_channel::init(SemanticVersion::default(), cx);
1735 });
1736 let (server, mut fake) = FakeLanguageServer::new(
1737 LanguageServerId(0),
1738 LanguageServerBinary {
1739 path: "path/to/language-server".into(),
1740 arguments: vec![],
1741 env: None,
1742 },
1743 "the-lsp".to_string(),
1744 Default::default(),
1745 &mut cx.to_async(),
1746 );
1747
1748 let (message_tx, message_rx) = channel::unbounded();
1749 let (diagnostics_tx, diagnostics_rx) = channel::unbounded();
1750 server
1751 .on_notification::<notification::ShowMessage, _>(move |params, _| {
1752 message_tx.try_send(params).unwrap()
1753 })
1754 .detach();
1755 server
1756 .on_notification::<notification::PublishDiagnostics, _>(move |params, _| {
1757 diagnostics_tx.try_send(params).unwrap()
1758 })
1759 .detach();
1760
1761 let server = cx
1762 .update(|cx| {
1763 let params = server.default_initialize_params(false, cx);
1764 let configuration = DidChangeConfigurationParams {
1765 settings: Default::default(),
1766 };
1767 server.initialize(params, configuration.into(), cx)
1768 })
1769 .await
1770 .unwrap();
1771 server
1772 .notify::<notification::DidOpenTextDocument>(&DidOpenTextDocumentParams {
1773 text_document: TextDocumentItem::new(
1774 Url::from_str("file://a/b").unwrap(),
1775 "rust".to_string(),
1776 0,
1777 "".to_string(),
1778 ),
1779 })
1780 .unwrap();
1781 assert_eq!(
1782 fake.receive_notification::<notification::DidOpenTextDocument>()
1783 .await
1784 .text_document
1785 .uri
1786 .as_str(),
1787 "file://a/b"
1788 );
1789
1790 fake.notify::<notification::ShowMessage>(&ShowMessageParams {
1791 typ: MessageType::ERROR,
1792 message: "ok".to_string(),
1793 });
1794 fake.notify::<notification::PublishDiagnostics>(&PublishDiagnosticsParams {
1795 uri: Url::from_str("file://b/c").unwrap(),
1796 version: Some(5),
1797 diagnostics: vec![],
1798 });
1799 assert_eq!(message_rx.recv().await.unwrap().message, "ok");
1800 assert_eq!(
1801 diagnostics_rx.recv().await.unwrap().uri.as_str(),
1802 "file://b/c"
1803 );
1804
1805 fake.set_request_handler::<request::Shutdown, _, _>(|_, _| async move { Ok(()) });
1806
1807 drop(server);
1808 fake.receive_notification::<notification::Exit>().await;
1809 }
1810
1811 #[gpui::test]
1812 fn test_deserialize_string_digit_id() {
1813 let json = r#"{"jsonrpc":"2.0","id":"2","method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///Users/mph/Devel/personal/hello-scala/","section":"metals"}]}}"#;
1814 let notification = serde_json::from_str::<AnyNotification>(json)
1815 .expect("message with string id should be parsed");
1816 let expected_id = RequestId::Str("2".to_string());
1817 assert_eq!(notification.id, Some(expected_id));
1818 }
1819
1820 #[gpui::test]
1821 fn test_deserialize_string_id() {
1822 let json = r#"{"jsonrpc":"2.0","id":"anythingAtAll","method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///Users/mph/Devel/personal/hello-scala/","section":"metals"}]}}"#;
1823 let notification = serde_json::from_str::<AnyNotification>(json)
1824 .expect("message with string id should be parsed");
1825 let expected_id = RequestId::Str("anythingAtAll".to_string());
1826 assert_eq!(notification.id, Some(expected_id));
1827 }
1828
1829 #[gpui::test]
1830 fn test_deserialize_int_id() {
1831 let json = r#"{"jsonrpc":"2.0","id":2,"method":"workspace/configuration","params":{"items":[{"scopeUri":"file:///Users/mph/Devel/personal/hello-scala/","section":"metals"}]}}"#;
1832 let notification = serde_json::from_str::<AnyNotification>(json)
1833 .expect("message with string id should be parsed");
1834 let expected_id = RequestId::Int(2);
1835 assert_eq!(notification.id, Some(expected_id));
1836 }
1837
1838 #[test]
1839 fn test_serialize_has_no_nulls() {
1840 // Ensure we're not setting both result and error variants. (ticket #10595)
1841 let no_tag = Response::<u32> {
1842 jsonrpc: "",
1843 id: RequestId::Int(0),
1844 value: LspResult::Ok(None),
1845 };
1846 assert_eq!(
1847 serde_json::to_string(&no_tag).unwrap(),
1848 "{\"jsonrpc\":\"\",\"id\":0,\"result\":null}"
1849 );
1850 let no_tag = Response::<u32> {
1851 jsonrpc: "",
1852 id: RequestId::Int(0),
1853 value: LspResult::Error(None),
1854 };
1855 assert_eq!(
1856 serde_json::to_string(&no_tag).unwrap(),
1857 "{\"jsonrpc\":\"\",\"id\":0,\"error\":null}"
1858 );
1859 }
1860}