1 //! The main loop of `rust-analyzer` responsible for dispatching LSP
2 //! requests/replies and notifications back to the client.
6 time::{Duration, Instant},
9 use always_assert::always;
10 use crossbeam_channel::{select, Receiver};
11 use ide_db::base_db::{SourceDatabaseExt, VfsPath};
12 use lsp_server::{Connection, Notification, Request};
13 use lsp_types::notification::Notification as _;
14 use vfs::{ChangeKind, FileId};
18 dispatch::{NotificationDispatcher, RequestDispatcher},
20 global_state::{file_id_to_url, url_to_file_id, GlobalState},
22 lsp_utils::{apply_document_changes, is_cancelled, notification_is, Progress},
23 mem_docs::DocumentData,
24 reload::{self, BuildDataProgress, ProjectWorkspaceProgress},
28 pub fn main_loop(config: Config, connection: Connection) -> Result<()> {
29 tracing::info!("initial config: {:#?}", config);
31 // Windows scheduler implements priority boosts: if thread waits for an
32 // event (like a condvar), and event fires, priority of the thread is
33 // temporary bumped. This optimization backfires in our case: each time the
34 // `main_loop` schedules a task to run on a threadpool, the worker threads
35 // gets a higher priority, and (on a machine with fewer cores) displaces the
36 // main loop! We work-around this by marking the main loop as a
37 // higher-priority thread.
39 // https://docs.microsoft.com/en-us/windows/win32/procthread/scheduling-priorities
40 // https://docs.microsoft.com/en-us/windows/win32/procthread/priority-boosts
41 // https://github.com/rust-analyzer/rust-analyzer/issues/2835
44 use winapi::um::processthreadsapi::*;
45 let thread = GetCurrentThread();
46 let thread_priority_above_normal = 1;
47 SetThreadPriority(thread, thread_priority_above_normal);
50 GlobalState::new(connection.sender, config).run(connection.receiver)
54 Lsp(lsp_server::Message),
56 Vfs(vfs::loader::Message),
57 Flycheck(flycheck::Message),
61 pub(crate) enum Task {
62 Response(lsp_server::Response),
63 Diagnostics(Vec<(FileId, Vec<lsp_types::Diagnostic>)>),
64 PrimeCaches(PrimeCachesProgress),
65 FetchWorkspace(ProjectWorkspaceProgress),
66 FetchBuildData(BuildDataProgress),
70 pub(crate) enum PrimeCachesProgress {
72 Report(ide::PrimeCachesProgress),
73 End { cancelled: bool },
76 impl fmt::Debug for Event {
77 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
78 let debug_verbose_not = |not: &Notification, f: &mut fmt::Formatter| {
79 f.debug_struct("Notification").field("method", ¬.method).finish()
83 Event::Lsp(lsp_server::Message::Notification(not)) => {
84 if notification_is::<lsp_types::notification::DidOpenTextDocument>(not)
85 || notification_is::<lsp_types::notification::DidChangeTextDocument>(not)
87 return debug_verbose_not(not, f);
90 Event::Task(Task::Response(resp)) => {
92 .debug_struct("Response")
93 .field("id", &resp.id)
94 .field("error", &resp.error)
100 Event::Lsp(it) => fmt::Debug::fmt(it, f),
101 Event::Task(it) => fmt::Debug::fmt(it, f),
102 Event::Vfs(it) => fmt::Debug::fmt(it, f),
103 Event::Flycheck(it) => fmt::Debug::fmt(it, f),
109 fn run(mut self, inbox: Receiver<lsp_server::Message>) -> Result<()> {
110 if self.config.linked_projects().is_empty()
111 && self.config.detached_files().is_empty()
112 && self.config.notifications().cargo_toml_not_found
115 lsp_types::MessageType::Error,
116 "rust-analyzer failed to discover workspace".to_string(),
120 if self.config.did_save_text_document_dynamic_registration() {
121 let save_registration_options = lsp_types::TextDocumentSaveRegistrationOptions {
122 include_text: Some(false),
123 text_document_registration_options: lsp_types::TextDocumentRegistrationOptions {
124 document_selector: Some(vec![
125 lsp_types::DocumentFilter {
128 pattern: Some("**/*.rs".into()),
130 lsp_types::DocumentFilter {
133 pattern: Some("**/Cargo.toml".into()),
135 lsp_types::DocumentFilter {
138 pattern: Some("**/Cargo.lock".into()),
144 let registration = lsp_types::Registration {
145 id: "textDocument/didSave".to_string(),
146 method: "textDocument/didSave".to_string(),
147 register_options: Some(serde_json::to_value(save_registration_options).unwrap()),
149 self.send_request::<lsp_types::request::RegisterCapability>(
150 lsp_types::RegistrationParams { registrations: vec![registration] },
155 self.fetch_workspaces_queue.request_op();
156 if self.fetch_workspaces_queue.should_start_op() {
157 self.fetch_workspaces();
160 while let Some(event) = self.next_event(&inbox) {
161 if let Event::Lsp(lsp_server::Message::Notification(not)) = &event {
162 if not.method == lsp_types::notification::Exit::METHOD {
166 self.handle_event(event)?
169 Err("client exited without proper shutdown sequence")?
172 fn next_event(&self, inbox: &Receiver<lsp_server::Message>) -> Option<Event> {
174 recv(inbox) -> msg =>
175 msg.ok().map(Event::Lsp),
177 recv(self.task_pool.receiver) -> task =>
178 Some(Event::Task(task.unwrap())),
180 recv(self.loader.receiver) -> task =>
181 Some(Event::Vfs(task.unwrap())),
183 recv(self.flycheck_receiver) -> task =>
184 Some(Event::Flycheck(task.unwrap())),
188 fn handle_event(&mut self, event: Event) -> Result<()> {
189 let loop_start = Instant::now();
190 // NOTE: don't count blocking select! call as a loop-turn time
191 let _p = profile::span("GlobalState::handle_event");
193 tracing::info!("handle_event({:?})", event);
194 let task_queue_len = self.task_pool.handle.len();
195 if task_queue_len > 0 {
196 tracing::info!("task queue len: {}", task_queue_len);
199 let was_quiescent = self.is_quiescent();
201 Event::Lsp(msg) => match msg {
202 lsp_server::Message::Request(req) => self.on_request(loop_start, req)?,
203 lsp_server::Message::Notification(not) => {
204 self.on_notification(not)?;
206 lsp_server::Message::Response(resp) => self.complete_request(resp),
208 Event::Task(mut task) => {
209 let _p = profile::span("GlobalState::handle_event/task");
210 let mut prime_caches_progress = Vec::new();
213 Task::Response(response) => self.respond(response),
214 Task::Diagnostics(diagnostics_per_file) => {
215 for (file_id, diagnostics) in diagnostics_per_file {
216 self.diagnostics.set_native_diagnostics(file_id, diagnostics)
219 Task::PrimeCaches(progress) => match progress {
220 PrimeCachesProgress::Begin => prime_caches_progress.push(progress),
221 PrimeCachesProgress::Report(_) => {
222 match prime_caches_progress.last_mut() {
223 Some(last @ PrimeCachesProgress::Report(_)) => {
224 // Coalesce subsequent update events.
227 _ => prime_caches_progress.push(progress),
230 PrimeCachesProgress::End { .. } => prime_caches_progress.push(progress),
232 Task::FetchWorkspace(progress) => {
233 let (state, msg) = match progress {
234 ProjectWorkspaceProgress::Begin => (Progress::Begin, None),
235 ProjectWorkspaceProgress::Report(msg) => {
236 (Progress::Report, Some(msg))
238 ProjectWorkspaceProgress::End(workspaces) => {
239 self.fetch_workspaces_queue.op_completed(workspaces);
241 let old = Arc::clone(&self.workspaces);
242 self.switch_workspaces();
243 let workspaces_updated = !Arc::ptr_eq(&old, &self.workspaces);
245 if self.config.run_build_scripts() && workspaces_updated {
246 self.fetch_build_data_queue.request_op()
249 (Progress::End, None)
253 self.report_progress("Fetching", state, msg, None);
255 Task::FetchBuildData(progress) => {
256 let (state, msg) = match progress {
257 BuildDataProgress::Begin => (Some(Progress::Begin), None),
258 BuildDataProgress::Report(msg) => {
259 (Some(Progress::Report), Some(msg))
261 BuildDataProgress::End(build_data_result) => {
262 self.fetch_build_data_queue.op_completed(build_data_result);
264 self.switch_workspaces();
266 (Some(Progress::End), None)
270 if let Some(state) = state {
271 self.report_progress("Loading", state, msg, None);
276 // Coalesce multiple task events into one loop turn
277 task = match self.task_pool.receiver.try_recv() {
283 for progress in prime_caches_progress {
284 let (state, message, fraction);
286 PrimeCachesProgress::Begin => {
287 state = Progress::Begin;
291 PrimeCachesProgress::Report(report) => {
292 state = Progress::Report;
293 message = Some(format!(
295 report.n_done, report.n_total, report.on_crate
297 fraction = Progress::fraction(report.n_done, report.n_total);
299 PrimeCachesProgress::End { cancelled } => {
300 state = Progress::End;
304 self.prime_caches_queue.op_completed(());
306 self.prime_caches_queue.request_op();
311 self.report_progress("Indexing", state, message, Some(fraction));
314 Event::Vfs(mut task) => {
315 let _p = profile::span("GlobalState::handle_event/vfs");
318 vfs::loader::Message::Loaded { files } => {
319 let vfs = &mut self.vfs.write().0;
320 for (path, contents) in files {
321 let path = VfsPath::from(path);
322 if !self.mem_docs.contains(&path) {
323 vfs.set_file_contents(path, contents);
327 vfs::loader::Message::Progress { n_total, n_done, config_version } => {
328 always!(config_version <= self.vfs_config_version);
330 self.vfs_progress_config_version = config_version;
331 self.vfs_progress_n_total = n_total;
332 self.vfs_progress_n_done = n_done;
334 let state = if n_done == 0 {
336 } else if n_done < n_total {
339 assert_eq!(n_done, n_total);
342 self.report_progress(
345 Some(format!("{}/{}", n_done, n_total)),
346 Some(Progress::fraction(n_done, n_total)),
350 // Coalesce many VFS event into a single loop turn
351 task = match self.loader.receiver.try_recv() {
357 Event::Flycheck(mut task) => {
358 let _p = profile::span("GlobalState::handle_event/flycheck");
361 flycheck::Message::AddDiagnostic { workspace_root, diagnostic } => {
363 crate::diagnostics::to_proto::map_rust_diagnostic_to_lsp(
364 &self.config.diagnostics_map(),
368 for diag in diagnostics {
369 match url_to_file_id(&self.vfs.read().0, &diag.url) {
370 Ok(file_id) => self.diagnostics.add_check_diagnostic(
377 "File with cargo diagnostic not found in VFS: {}",
385 flycheck::Message::Progress { id, progress } => {
386 let (state, message) = match progress {
387 flycheck::Progress::DidStart => {
388 self.diagnostics.clear_check();
389 (Progress::Begin, None)
391 flycheck::Progress::DidCheckCrate(target) => {
392 (Progress::Report, Some(target))
394 flycheck::Progress::DidCancel => (Progress::End, None),
395 flycheck::Progress::DidFinish(result) => {
396 if let Err(err) = result {
398 lsp_types::MessageType::Error,
399 format!("cargo check failed: {}", err),
402 (Progress::End, None)
406 // When we're running multiple flychecks, we have to include a disambiguator in
407 // the title, or the editor complains. Note that this is a user-facing string.
408 let title = if self.flycheck.len() == 1 {
409 "cargo check".to_string()
411 format!("cargo check (#{})", id + 1)
413 self.report_progress(&title, state, message, None);
416 // Coalesce many flycheck updates into a single loop turn
417 task = match self.flycheck_receiver.try_recv() {
425 let state_changed = self.process_changes();
426 let memdocs_added_or_removed = self.mem_docs.take_changes();
428 if self.is_quiescent() {
430 for flycheck in &self.flycheck {
433 self.prime_caches_queue.request_op();
436 if !was_quiescent || state_changed {
437 // Refresh semantic tokens if the client supports it.
438 if self.config.semantic_tokens_refresh() {
439 self.semantic_tokens_cache.lock().clear();
440 self.send_request::<lsp_types::request::SemanticTokensRefesh>((), |_, _| ());
443 // Refresh code lens if the client supports it.
444 if self.config.code_lens_refresh() {
445 self.send_request::<lsp_types::request::CodeLensRefresh>((), |_, _| ());
449 if !was_quiescent || state_changed || memdocs_added_or_removed {
450 if self.config.publish_diagnostics() {
451 self.update_diagnostics()
456 if let Some(diagnostic_changes) = self.diagnostics.take_changes() {
457 for file_id in diagnostic_changes {
458 let db = self.analysis_host.raw_database();
459 let source_root = db.file_source_root(file_id);
460 if db.source_root(source_root).is_library {
461 // Only publish diagnostics for files in the workspace, not from crates.io deps
463 // While theoretically these should never have errors, we have quite a few false
464 // positives particularly in the stdlib, and those diagnostics would stay around
465 // forever if we emitted them here.
469 let url = file_id_to_url(&self.vfs.read().0, file_id);
470 let diagnostics = self.diagnostics.diagnostics_for(file_id).cloned().collect();
471 let version = from_proto::vfs_path(&url)
472 .map(|path| self.mem_docs.get(&path).map(|it| it.version))
473 .unwrap_or_default();
475 self.send_notification::<lsp_types::notification::PublishDiagnostics>(
476 lsp_types::PublishDiagnosticsParams { uri: url, diagnostics, version },
481 if self.config.cargo_autoreload() {
482 if self.fetch_workspaces_queue.should_start_op() {
483 self.fetch_workspaces();
486 if self.fetch_build_data_queue.should_start_op() {
487 self.fetch_build_data();
489 if self.prime_caches_queue.should_start_op() {
490 self.task_pool.handle.spawn_with_sender({
491 let analysis = self.snapshot().analysis;
493 sender.send(Task::PrimeCaches(PrimeCachesProgress::Begin)).unwrap();
494 let res = analysis.prime_caches(|progress| {
495 let report = PrimeCachesProgress::Report(progress);
496 sender.send(Task::PrimeCaches(report)).unwrap();
499 .send(Task::PrimeCaches(PrimeCachesProgress::End {
500 cancelled: res.is_err(),
507 let status = self.current_status();
508 if self.last_reported_status.as_ref() != Some(&status) {
509 self.last_reported_status = Some(status.clone());
511 if let (lsp_ext::Health::Error, Some(message)) = (status.health, &status.message) {
512 self.show_message(lsp_types::MessageType::Error, message.clone());
515 if self.config.server_status_notification() {
516 self.send_notification::<lsp_ext::ServerStatusNotification>(status);
520 let loop_duration = loop_start.elapsed();
521 if loop_duration > Duration::from_millis(100) {
522 tracing::warn!("overly long loop turn: {:?}", loop_duration);
523 self.poke_rust_analyzer_developer(format!(
524 "overly long loop turn: {:?}",
531 fn on_request(&mut self, request_received: Instant, req: Request) -> Result<()> {
532 self.register_request(&req, request_received);
534 if self.shutdown_requested {
535 self.respond(lsp_server::Response::new_err(
537 lsp_server::ErrorCode::InvalidRequest as i32,
538 "Shutdown already requested.".to_owned(),
544 // Avoid flashing a bunch of unresolved references during initial load.
545 if self.workspaces.is_empty() && !self.is_quiescent() {
546 self.respond(lsp_server::Response::new_err(
548 // FIXME: i32 should impl From<ErrorCode> (from() guarantees lossless conversion)
549 lsp_server::ErrorCode::ContentModified as i32,
550 "waiting for cargo metadata or cargo check".to_owned(),
555 RequestDispatcher { req: Some(req), global_state: self }
556 .on_sync_mut::<lsp_ext::ReloadWorkspace>(|s, ()| {
557 s.fetch_workspaces_queue.request_op();
560 .on_sync_mut::<lsp_types::request::Shutdown>(|s, ()| {
561 s.shutdown_requested = true;
564 .on_sync_mut::<lsp_ext::MemoryUsage>(|s, p| handlers::handle_memory_usage(s, p))?
565 .on_sync::<lsp_ext::JoinLines>(handlers::handle_join_lines)?
566 .on_sync::<lsp_ext::OnEnter>(handlers::handle_on_enter)?
567 .on_sync::<lsp_types::request::SelectionRangeRequest>(handlers::handle_selection_range)?
568 .on_sync::<lsp_ext::MatchingBrace>(handlers::handle_matching_brace)?
569 .on::<lsp_ext::AnalyzerStatus>(handlers::handle_analyzer_status)
570 .on::<lsp_ext::SyntaxTree>(handlers::handle_syntax_tree)
571 .on::<lsp_ext::ViewHir>(handlers::handle_view_hir)
572 .on::<lsp_ext::ViewCrateGraph>(handlers::handle_view_crate_graph)
573 .on::<lsp_ext::ViewItemTree>(handlers::handle_view_item_tree)
574 .on::<lsp_ext::ExpandMacro>(handlers::handle_expand_macro)
575 .on::<lsp_ext::ParentModule>(handlers::handle_parent_module)
576 .on::<lsp_ext::Runnables>(handlers::handle_runnables)
577 .on::<lsp_ext::RelatedTests>(handlers::handle_related_tests)
578 .on::<lsp_ext::InlayHints>(handlers::handle_inlay_hints)
579 .on::<lsp_ext::CodeActionRequest>(handlers::handle_code_action)
580 .on::<lsp_ext::CodeActionResolveRequest>(handlers::handle_code_action_resolve)
581 .on::<lsp_ext::HoverRequest>(handlers::handle_hover)
582 .on::<lsp_ext::ExternalDocs>(handlers::handle_open_docs)
583 .on::<lsp_ext::OpenCargoToml>(handlers::handle_open_cargo_toml)
584 .on::<lsp_ext::MoveItem>(handlers::handle_move_item)
585 .on::<lsp_ext::WorkspaceSymbol>(handlers::handle_workspace_symbol)
586 .on::<lsp_types::request::OnTypeFormatting>(handlers::handle_on_type_formatting)
587 .on::<lsp_types::request::DocumentSymbolRequest>(handlers::handle_document_symbol)
588 .on::<lsp_types::request::GotoDefinition>(handlers::handle_goto_definition)
589 .on::<lsp_types::request::GotoDeclaration>(handlers::handle_goto_declaration)
590 .on::<lsp_types::request::GotoImplementation>(handlers::handle_goto_implementation)
591 .on::<lsp_types::request::GotoTypeDefinition>(handlers::handle_goto_type_definition)
592 .on::<lsp_types::request::Completion>(handlers::handle_completion)
593 .on::<lsp_types::request::ResolveCompletionItem>(handlers::handle_completion_resolve)
594 .on::<lsp_types::request::CodeLensRequest>(handlers::handle_code_lens)
595 .on::<lsp_types::request::CodeLensResolve>(handlers::handle_code_lens_resolve)
596 .on::<lsp_types::request::FoldingRangeRequest>(handlers::handle_folding_range)
597 .on::<lsp_types::request::SignatureHelpRequest>(handlers::handle_signature_help)
598 .on::<lsp_types::request::PrepareRenameRequest>(handlers::handle_prepare_rename)
599 .on::<lsp_types::request::Rename>(handlers::handle_rename)
600 .on::<lsp_types::request::References>(handlers::handle_references)
601 .on::<lsp_types::request::Formatting>(handlers::handle_formatting)
602 .on::<lsp_types::request::RangeFormatting>(handlers::handle_range_formatting)
603 .on::<lsp_types::request::DocumentHighlightRequest>(handlers::handle_document_highlight)
604 .on::<lsp_types::request::CallHierarchyPrepare>(handlers::handle_call_hierarchy_prepare)
605 .on::<lsp_types::request::CallHierarchyIncomingCalls>(
606 handlers::handle_call_hierarchy_incoming,
608 .on::<lsp_types::request::CallHierarchyOutgoingCalls>(
609 handlers::handle_call_hierarchy_outgoing,
611 .on::<lsp_types::request::SemanticTokensFullRequest>(
612 handlers::handle_semantic_tokens_full,
614 .on::<lsp_types::request::SemanticTokensFullDeltaRequest>(
615 handlers::handle_semantic_tokens_full_delta,
617 .on::<lsp_types::request::SemanticTokensRangeRequest>(
618 handlers::handle_semantic_tokens_range,
620 .on::<lsp_types::request::WillRenameFiles>(handlers::handle_will_rename_files)
621 .on::<lsp_ext::Ssr>(handlers::handle_ssr)
625 fn on_notification(&mut self, not: Notification) -> Result<()> {
626 NotificationDispatcher { not: Some(not), global_state: self }
627 .on::<lsp_types::notification::Cancel>(|this, params| {
628 let id: lsp_server::RequestId = match params.id {
629 lsp_types::NumberOrString::Number(id) => id.into(),
630 lsp_types::NumberOrString::String(id) => id.into(),
635 .on::<lsp_types::notification::WorkDoneProgressCancel>(|_this, _params| {
636 // Just ignore this. It is OK to continue sending progress
637 // notifications for this token, as the client can't know when
638 // we accepted notification.
641 .on::<lsp_types::notification::DidOpenTextDocument>(|this, params| {
642 if let Ok(path) = from_proto::vfs_path(¶ms.text_document.uri) {
645 .insert(path.clone(), DocumentData::new(params.text_document.version))
648 tracing::error!("duplicate DidOpenTextDocument: {}", path)
653 .set_file_contents(path, Some(params.text_document.text.into_bytes()));
657 .on::<lsp_types::notification::DidChangeTextDocument>(|this, params| {
658 if let Ok(path) = from_proto::vfs_path(¶ms.text_document.uri) {
659 match this.mem_docs.get_mut(&path) {
661 // The version passed in DidChangeTextDocument is the version after all edits are applied
662 // so we should apply it before the vfs is notified.
663 doc.version = params.text_document.version;
666 tracing::error!("unexpected DidChangeTextDocument: {}; send DidOpenTextDocument first", path);
671 let vfs = &mut this.vfs.write().0;
672 let file_id = vfs.file_id(&path).unwrap();
673 let mut text = String::from_utf8(vfs.file_contents(file_id).to_vec()).unwrap();
674 apply_document_changes(&mut text, params.content_changes);
676 vfs.set_file_contents(path, Some(text.into_bytes()));
680 .on::<lsp_types::notification::DidCloseTextDocument>(|this, params| {
681 if let Ok(path) = from_proto::vfs_path(¶ms.text_document.uri) {
682 if this.mem_docs.remove(&path).is_err() {
683 tracing::error!("orphan DidCloseTextDocument: {}", path);
686 this.semantic_tokens_cache.lock().remove(¶ms.text_document.uri);
688 if let Some(path) = path.as_path() {
689 this.loader.handle.invalidate(path.to_path_buf());
694 .on::<lsp_types::notification::DidSaveTextDocument>(|this, params| {
695 for flycheck in &this.flycheck {
698 if let Ok(abs_path) = from_proto::abs_path(¶ms.text_document.uri) {
699 if reload::should_refresh_for_change(&abs_path, ChangeKind::Modify) {
700 this.fetch_workspaces_queue.request_op();
705 .on::<lsp_types::notification::DidChangeConfiguration>(|this, _params| {
706 // As stated in https://github.com/microsoft/language-server-protocol/issues/676,
707 // this notification's parameters should be ignored and the actual config queried separately.
708 this.send_request::<lsp_types::request::WorkspaceConfiguration>(
709 lsp_types::ConfigurationParams {
710 items: vec![lsp_types::ConfigurationItem {
712 section: Some("rust-analyzer".to_string()),
716 tracing::debug!("config update response: '{:?}", resp);
717 let lsp_server::Response { error, result, .. } = resp;
719 match (error, result) {
721 tracing::error!("failed to fetch the server settings: {:?}", err)
723 (None, Some(mut configs)) => {
724 if let Some(json) = configs.get_mut(0) {
725 // Note that json can be null according to the spec if the client can't
726 // provide a configuration. This is handled in Config::update below.
727 let mut config = Config::clone(&*this.config);
728 config.update(json.take());
729 this.update_configuration(config);
732 (None, None) => tracing::error!(
733 "received empty server settings response from the client"
741 .on::<lsp_types::notification::DidChangeWatchedFiles>(|this, params| {
742 for change in params.changes {
743 if let Ok(path) = from_proto::abs_path(&change.uri) {
744 this.loader.handle.invalidate(path);
753 fn update_diagnostics(&mut self) {
754 let subscriptions = self
757 .map(|path| self.vfs.read().0.file_id(path).unwrap())
758 .collect::<Vec<_>>();
760 tracing::trace!("updating notifications for {:?}", subscriptions);
762 let snapshot = self.snapshot();
763 self.task_pool.handle.spawn(move || {
764 let diagnostics = subscriptions
766 .filter_map(|file_id| {
767 handlers::publish_diagnostics(&snapshot, file_id)
769 if !is_cancelled(&*err) {
770 tracing::error!("failed to compute diagnostics: {:?}", err);
775 .map(|diags| (file_id, diags))
777 .collect::<Vec<_>>();
778 Task::Diagnostics(diagnostics)