1 //! The context or environment in which the language server functions. In our
2 //! server implementation this is know as the `WorldState`.
4 //! Each tick provides an immutable snapshot of the state as `WorldSnapshot`.
6 use std::{sync::Arc, time::Instant};
8 use crossbeam_channel::{unbounded, Receiver, Sender};
9 use flycheck::FlycheckHandle;
10 use ide::{Analysis, AnalysisHost, Cancellable, Change, FileId};
11 use ide_db::base_db::CrateId;
12 use lsp_types::{SemanticTokens, Url};
13 use parking_lot::{Mutex, RwLock};
15 CargoWorkspace, ProcMacroClient, ProjectWorkspace, Target, WorkspaceBuildScripts,
17 use rustc_hash::FxHashMap;
18 use vfs::AnchoredPathBuf;
22 diagnostics::{CheckFixes, DiagnosticCollection},
24 line_index::{LineEndings, LineIndex},
29 reload::SourceRootConfig,
30 request_metrics::{LatestRequests, RequestMetrics},
31 thread_pool::TaskPool,
32 to_proto::url_from_abs_path,
36 // Enforces drop order
37 pub(crate) struct Handle<H, C> {
39 pub(crate) receiver: C,
42 pub(crate) type ReqHandler = fn(&mut GlobalState, lsp_server::Response);
43 pub(crate) type ReqQueue = lsp_server::ReqQueue<(String, Instant), ReqHandler>;
45 /// `GlobalState` is the primary mutable state of the language server
47 /// The most interesting components are `vfs`, which stores a consistent
48 /// snapshot of the file systems, and `analysis_host`, which stores our
49 /// incremental salsa database.
51 /// Note that this struct has more than on impl in various modules!
52 pub(crate) struct GlobalState {
53 sender: Sender<lsp_server::Message>,
55 pub(crate) task_pool: Handle<TaskPool<Task>, Receiver<Task>>,
56 pub(crate) loader: Handle<Box<dyn vfs::loader::Handle>, Receiver<vfs::loader::Message>>,
57 pub(crate) config: Arc<Config>,
58 pub(crate) analysis_host: AnalysisHost,
59 pub(crate) diagnostics: DiagnosticCollection,
60 pub(crate) mem_docs: MemDocs,
61 pub(crate) semantic_tokens_cache: Arc<Mutex<FxHashMap<Url, SemanticTokens>>>,
62 pub(crate) shutdown_requested: bool,
63 pub(crate) last_reported_status: Option<lsp_ext::ServerStatusParams>,
64 pub(crate) source_root_config: SourceRootConfig,
65 pub(crate) proc_macro_client: Option<ProcMacroClient>,
67 pub(crate) flycheck: Vec<FlycheckHandle>,
68 pub(crate) flycheck_sender: Sender<flycheck::Message>,
69 pub(crate) flycheck_receiver: Receiver<flycheck::Message>,
71 pub(crate) vfs: Arc<RwLock<(vfs::Vfs, FxHashMap<FileId, LineEndings>)>>,
72 pub(crate) vfs_config_version: u32,
73 pub(crate) vfs_progress_config_version: u32,
74 pub(crate) vfs_progress_n_total: usize,
75 pub(crate) vfs_progress_n_done: usize,
77 /// `workspaces` field stores the data we actually use, while the `OpQueue`
78 /// stores the result of the last fetch.
80 /// If the fetch (partially) fails, we do not update the current value.
82 /// The handling of build data is subtle. We fetch workspace in two phases:
84 /// *First*, we run `cargo metadata`, which gives us fast results for
87 /// *Second*, we run `cargo check` which runs build scripts and compiles
90 /// We need both for the precise analysis, but we want rust-analyzer to be
91 /// at least partially available just after the first phase. That's because
92 /// first phase is much faster, and is much less likely to fail.
94 /// This creates a complication -- by the time the second phase completes,
95 /// the results of the fist phase could be invalid. That is, while we run
96 /// `cargo check`, the user edits `Cargo.toml`, we notice this, and the new
97 /// `cargo metadata` completes before `cargo check`.
99 /// An additional complication is that we want to avoid needless work. When
100 /// the user just adds comments or whitespace to Cargo.toml, we do not want
101 /// to invalidate any salsa caches.
102 pub(crate) workspaces: Arc<Vec<ProjectWorkspace>>,
103 pub(crate) fetch_workspaces_queue: OpQueue<Vec<anyhow::Result<ProjectWorkspace>>>,
104 pub(crate) fetch_build_data_queue:
105 OpQueue<(Arc<Vec<ProjectWorkspace>>, Vec<anyhow::Result<WorkspaceBuildScripts>>)>,
107 pub(crate) prime_caches_queue: OpQueue<()>,
109 latest_requests: Arc<RwLock<LatestRequests>>,
112 /// An immutable snapshot of the world's state at a point in time.
113 pub(crate) struct GlobalStateSnapshot {
114 pub(crate) config: Arc<Config>,
115 pub(crate) analysis: Analysis,
116 pub(crate) check_fixes: CheckFixes,
117 pub(crate) latest_requests: Arc<RwLock<LatestRequests>>,
119 pub(crate) semantic_tokens_cache: Arc<Mutex<FxHashMap<Url, SemanticTokens>>>,
120 vfs: Arc<RwLock<(vfs::Vfs, FxHashMap<FileId, LineEndings>)>>,
121 pub(crate) workspaces: Arc<Vec<ProjectWorkspace>>,
125 pub(crate) fn new(sender: Sender<lsp_server::Message>, config: Config) -> GlobalState {
127 let (sender, receiver) = unbounded::<vfs::loader::Message>();
128 let handle: vfs_notify::NotifyHandle =
129 vfs::loader::Handle::spawn(Box::new(move |msg| sender.send(msg).unwrap()));
130 let handle = Box::new(handle) as Box<dyn vfs::loader::Handle>;
131 Handle { handle, receiver }
135 let (sender, receiver) = unbounded();
136 let handle = TaskPool::new(sender);
137 Handle { handle, receiver }
140 let analysis_host = AnalysisHost::new(config.lru_capacity());
141 let (flycheck_sender, flycheck_receiver) = unbounded();
142 let mut this = GlobalState {
144 req_queue: ReqQueue::default(),
147 config: Arc::new(config.clone()),
149 diagnostics: Default::default(),
150 mem_docs: MemDocs::default(),
151 semantic_tokens_cache: Arc::new(Default::default()),
152 shutdown_requested: false,
153 last_reported_status: None,
154 source_root_config: SourceRootConfig::default(),
155 proc_macro_client: None,
157 flycheck: Vec::new(),
161 vfs: Arc::new(RwLock::new((vfs::Vfs::default(), FxHashMap::default()))),
162 vfs_config_version: 0,
163 vfs_progress_config_version: 0,
164 vfs_progress_n_total: 0,
165 vfs_progress_n_done: 0,
167 workspaces: Arc::new(Vec::new()),
168 fetch_workspaces_queue: OpQueue::default(),
169 prime_caches_queue: OpQueue::default(),
171 fetch_build_data_queue: OpQueue::default(),
172 latest_requests: Default::default(),
174 // Apply any required database inputs from the config.
175 this.update_configuration(config);
179 pub(crate) fn process_changes(&mut self) -> bool {
180 let _p = profile::span("GlobalState::process_changes");
181 let mut fs_changes = Vec::new();
182 let mut has_fs_changes = false;
185 let mut change = Change::new();
186 let (vfs, line_endings_map) = &mut *self.vfs.write();
187 let changed_files = vfs.take_changes();
188 if changed_files.is_empty() {
192 for file in changed_files {
193 if file.is_created_or_deleted() {
194 if let Some(path) = vfs.file_path(file.file_id).as_path() {
195 fs_changes.push((path.to_path_buf(), file.change_kind));
196 has_fs_changes = true;
200 let text = if file.exists() {
201 let bytes = vfs.file_contents(file.file_id).to_vec();
202 match String::from_utf8(bytes).ok() {
204 let (text, line_endings) = LineEndings::normalize(text);
205 line_endings_map.insert(file.file_id, line_endings);
213 change.change_file(file.file_id, text);
216 let roots = self.source_root_config.partition(vfs);
217 change.set_roots(roots);
222 self.analysis_host.apply_change(change);
223 self.maybe_refresh(&fs_changes);
227 pub(crate) fn snapshot(&self) -> GlobalStateSnapshot {
228 GlobalStateSnapshot {
229 config: Arc::clone(&self.config),
230 workspaces: Arc::clone(&self.workspaces),
231 analysis: self.analysis_host.analysis(),
232 vfs: Arc::clone(&self.vfs),
233 latest_requests: Arc::clone(&self.latest_requests),
234 check_fixes: Arc::clone(&self.diagnostics.check_fixes),
235 mem_docs: self.mem_docs.clone(),
236 semantic_tokens_cache: Arc::clone(&self.semantic_tokens_cache),
240 pub(crate) fn send_request<R: lsp_types::request::Request>(
245 let request = self.req_queue.outgoing.register(R::METHOD.to_string(), params, handler);
246 self.send(request.into());
248 pub(crate) fn complete_request(&mut self, response: lsp_server::Response) {
249 let handler = self.req_queue.outgoing.complete(response.id.clone());
250 handler(self, response)
253 pub(crate) fn send_notification<N: lsp_types::notification::Notification>(
257 let not = lsp_server::Notification::new(N::METHOD.to_string(), params);
258 self.send(not.into());
261 pub(crate) fn register_request(
263 request: &lsp_server::Request,
264 request_received: Instant,
268 .register(request.id.clone(), (request.method.clone(), request_received));
270 pub(crate) fn respond(&mut self, response: lsp_server::Response) {
271 if let Some((method, start)) = self.req_queue.incoming.complete(response.id.clone()) {
272 let duration = start.elapsed();
273 log::info!("handled req#{} in {:?}", response.id, duration);
274 let metrics = RequestMetrics { id: response.id.clone(), method, duration };
275 self.latest_requests.write().record(metrics);
276 self.send(response.into());
279 pub(crate) fn cancel(&mut self, request_id: lsp_server::RequestId) {
280 if let Some(response) = self.req_queue.incoming.cancel(request_id) {
281 self.send(response.into());
285 fn send(&mut self, message: lsp_server::Message) {
286 self.sender.send(message).unwrap()
290 impl Drop for GlobalState {
292 self.analysis_host.request_cancellation()
296 impl GlobalStateSnapshot {
297 pub(crate) fn url_to_file_id(&self, url: &Url) -> Result<FileId> {
298 url_to_file_id(&self.vfs.read().0, url)
301 pub(crate) fn file_id_to_url(&self, id: FileId) -> Url {
302 file_id_to_url(&self.vfs.read().0, id)
305 pub(crate) fn file_line_index(&self, file_id: FileId) -> Cancellable<LineIndex> {
306 let endings = self.vfs.read().1[&file_id];
307 let index = self.analysis.file_line_index(file_id)?;
308 let res = LineIndex { index, endings, encoding: self.config.offset_encoding() };
312 pub(crate) fn url_file_version(&self, url: &Url) -> Option<i32> {
313 let path = from_proto::vfs_path(url).ok()?;
314 Some(self.mem_docs.get(&path)?.version)
317 pub(crate) fn anchored_path(&self, path: &AnchoredPathBuf) -> Url {
318 let mut base = self.vfs.read().0.file_path(path.anchor);
320 let path = base.join(&path.path).unwrap();
321 let path = path.as_path().unwrap();
322 url_from_abs_path(path)
325 pub(crate) fn cargo_target_for_crate_root(
328 ) -> Option<(&CargoWorkspace, Target)> {
329 let file_id = self.analysis.crate_root(crate_id).ok()?;
330 let path = self.vfs.read().0.file_path(file_id);
331 let path = path.as_path()?;
332 self.workspaces.iter().find_map(|ws| match ws {
333 ProjectWorkspace::Cargo { cargo, .. } => {
334 cargo.target_by_root(path).map(|it| (cargo, it))
336 ProjectWorkspace::Json { .. } => None,
337 ProjectWorkspace::DetachedFiles { .. } => None,
342 pub(crate) fn file_id_to_url(vfs: &vfs::Vfs, id: FileId) -> Url {
343 let path = vfs.file_path(id);
344 let path = path.as_path().unwrap();
345 url_from_abs_path(path)
348 pub(crate) fn url_to_file_id(vfs: &vfs::Vfs, url: &Url) -> Result<FileId> {
349 let path = from_proto::vfs_path(url)?;
350 let res = vfs.file_id(&path).ok_or_else(|| format!("file not found: {}", path))?;