586 lines
26 KiB
Rust
586 lines
26 KiB
Rust
//! The main loop of `rust-analyzer` responsible for dispatching LSP
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//! requests/replies and notifications back to the client.
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use std::{
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env, fmt, panic,
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time::{Duration, Instant},
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};
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use base_db::VfsPath;
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use crossbeam_channel::{select, Receiver};
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use ide::{Canceled, FileId};
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use lsp_server::{Connection, Notification, Request, Response};
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use lsp_types::notification::Notification as _;
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use project_model::ProjectWorkspace;
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use vfs::ChangeKind;
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use crate::{
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config::Config,
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dispatch::{NotificationDispatcher, RequestDispatcher},
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document::DocumentData,
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from_proto,
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global_state::{file_id_to_url, url_to_file_id, GlobalState, Status},
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handlers, lsp_ext,
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lsp_utils::{apply_document_changes, is_canceled, notification_is, Progress},
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Result,
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};
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pub fn main_loop(config: Config, connection: Connection) -> Result<()> {
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log::info!("initial config: {:#?}", config);
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// Windows scheduler implements priority boosts: if thread waits for an
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// event (like a condvar), and event fires, priority of the thread is
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// temporary bumped. This optimization backfires in our case: each time the
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// `main_loop` schedules a task to run on a threadpool, the worker threads
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// gets a higher priority, and (on a machine with fewer cores) displaces the
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// main loop! We work-around this by marking the main loop as a
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// higher-priority thread.
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//
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// https://docs.microsoft.com/en-us/windows/win32/procthread/scheduling-priorities
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// https://docs.microsoft.com/en-us/windows/win32/procthread/priority-boosts
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// https://github.com/rust-analyzer/rust-analyzer/issues/2835
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#[cfg(windows)]
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unsafe {
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use winapi::um::processthreadsapi::*;
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let thread = GetCurrentThread();
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let thread_priority_above_normal = 1;
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SetThreadPriority(thread, thread_priority_above_normal);
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}
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GlobalState::new(connection.sender, config).run(connection.receiver)
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}
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enum Event {
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Lsp(lsp_server::Message),
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Task(Task),
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Vfs(vfs::loader::Message),
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Flycheck(flycheck::Message),
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}
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#[derive(Debug)]
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pub(crate) enum Task {
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Response(Response),
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Diagnostics(Vec<(FileId, Vec<lsp_types::Diagnostic>)>),
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Workspaces(Vec<anyhow::Result<ProjectWorkspace>>),
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Unit,
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}
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impl fmt::Debug for Event {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let debug_verbose_not = |not: &Notification, f: &mut fmt::Formatter| {
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f.debug_struct("Notification").field("method", ¬.method).finish()
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};
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match self {
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Event::Lsp(lsp_server::Message::Notification(not)) => {
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if notification_is::<lsp_types::notification::DidOpenTextDocument>(not)
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|| notification_is::<lsp_types::notification::DidChangeTextDocument>(not)
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{
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return debug_verbose_not(not, f);
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}
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}
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Event::Task(Task::Response(resp)) => {
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return f
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.debug_struct("Response")
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.field("id", &resp.id)
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.field("error", &resp.error)
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.finish();
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}
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_ => (),
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}
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match self {
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Event::Lsp(it) => fmt::Debug::fmt(it, f),
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Event::Task(it) => fmt::Debug::fmt(it, f),
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Event::Vfs(it) => fmt::Debug::fmt(it, f),
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Event::Flycheck(it) => fmt::Debug::fmt(it, f),
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}
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}
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}
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impl GlobalState {
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fn run(mut self, inbox: Receiver<lsp_server::Message>) -> Result<()> {
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if self.config.linked_projects.is_empty() && self.config.notifications.cargo_toml_not_found
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{
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self.show_message(
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lsp_types::MessageType::Error,
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"rust-analyzer failed to discover workspace".to_string(),
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);
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};
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let save_registration_options = lsp_types::TextDocumentSaveRegistrationOptions {
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include_text: Some(false),
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text_document_registration_options: lsp_types::TextDocumentRegistrationOptions {
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document_selector: Some(vec![
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lsp_types::DocumentFilter {
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language: None,
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scheme: None,
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pattern: Some("**/*.rs".into()),
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},
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lsp_types::DocumentFilter {
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language: None,
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scheme: None,
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pattern: Some("**/Cargo.toml".into()),
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},
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lsp_types::DocumentFilter {
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language: None,
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scheme: None,
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pattern: Some("**/Cargo.lock".into()),
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},
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]),
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},
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};
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let registration = lsp_types::Registration {
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id: "textDocument/didSave".to_string(),
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method: "textDocument/didSave".to_string(),
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register_options: Some(serde_json::to_value(save_registration_options).unwrap()),
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};
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self.send_request::<lsp_types::request::RegisterCapability>(
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lsp_types::RegistrationParams { registrations: vec![registration] },
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|_, _| (),
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);
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self.fetch_workspaces();
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while let Some(event) = self.next_event(&inbox) {
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if let Event::Lsp(lsp_server::Message::Notification(not)) = &event {
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if not.method == lsp_types::notification::Exit::METHOD {
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return Ok(());
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}
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}
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self.handle_event(event)?
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}
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Err("client exited without proper shutdown sequence")?
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}
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fn next_event(&self, inbox: &Receiver<lsp_server::Message>) -> Option<Event> {
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select! {
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recv(inbox) -> msg =>
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msg.ok().map(Event::Lsp),
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recv(self.task_pool.receiver) -> task =>
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Some(Event::Task(task.unwrap())),
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recv(self.loader.receiver) -> task =>
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Some(Event::Vfs(task.unwrap())),
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recv(self.flycheck_receiver) -> task =>
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Some(Event::Flycheck(task.unwrap())),
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}
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}
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fn handle_event(&mut self, event: Event) -> Result<()> {
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let loop_start = Instant::now();
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// NOTE: don't count blocking select! call as a loop-turn time
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let _p = profile::span("GlobalState::handle_event");
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log::info!("handle_event({:?})", event);
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let task_queue_len = self.task_pool.handle.len();
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if task_queue_len > 0 {
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log::info!("task queue len: {}", task_queue_len);
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}
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let prev_status = self.status;
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match event {
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Event::Lsp(msg) => match msg {
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lsp_server::Message::Request(req) => self.on_request(loop_start, req)?,
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lsp_server::Message::Notification(not) => {
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self.on_notification(not)?;
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}
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lsp_server::Message::Response(resp) => self.complete_request(resp),
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},
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Event::Task(task) => match task {
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Task::Response(response) => self.respond(response),
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Task::Diagnostics(diagnostics_per_file) => {
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for (file_id, diagnostics) in diagnostics_per_file {
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self.diagnostics.set_native_diagnostics(file_id, diagnostics)
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}
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}
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Task::Workspaces(workspaces) => self.switch_workspaces(workspaces),
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Task::Unit => (),
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},
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Event::Vfs(mut task) => {
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let _p = profile::span("GlobalState::handle_event/vfs");
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loop {
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match task {
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vfs::loader::Message::Loaded { files } => {
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let vfs = &mut self.vfs.write().0;
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for (path, contents) in files {
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let path = VfsPath::from(path);
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if !self.mem_docs.contains_key(&path) {
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vfs.set_file_contents(path, contents)
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}
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}
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}
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vfs::loader::Message::Progress { n_total, n_done } => {
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if n_total == 0 {
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self.transition(Status::Invalid);
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} else {
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let state = if n_done == 0 {
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self.transition(Status::Loading);
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Progress::Begin
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} else if n_done < n_total {
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Progress::Report
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} else {
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assert_eq!(n_done, n_total);
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self.transition(Status::Ready);
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Progress::End
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};
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self.report_progress(
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"roots scanned",
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state,
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Some(format!("{}/{}", n_done, n_total)),
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Some(Progress::fraction(n_done, n_total)),
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)
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}
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}
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}
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// Coalesce many VFS event into a single loop turn
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task = match self.loader.receiver.try_recv() {
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Ok(task) => task,
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Err(_) => break,
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}
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}
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}
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Event::Flycheck(task) => match task {
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flycheck::Message::AddDiagnostic { workspace_root, diagnostic } => {
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let diagnostics = crate::diagnostics::to_proto::map_rust_diagnostic_to_lsp(
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&self.config.diagnostics_map,
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&diagnostic,
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&workspace_root,
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);
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for diag in diagnostics {
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match url_to_file_id(&self.vfs.read().0, &diag.url) {
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Ok(file_id) => self.diagnostics.add_check_diagnostic(
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file_id,
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diag.diagnostic,
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diag.fixes,
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),
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Err(err) => {
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log::error!("File with cargo diagnostic not found in VFS: {}", err);
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}
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};
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}
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}
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flycheck::Message::Progress { id, progress } => {
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let (state, message) = match progress {
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flycheck::Progress::DidStart => {
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self.diagnostics.clear_check();
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(Progress::Begin, None)
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}
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flycheck::Progress::DidCheckCrate(target) => {
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(Progress::Report, Some(target))
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}
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flycheck::Progress::DidCancel => (Progress::End, None),
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flycheck::Progress::DidFinish(result) => {
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if let Err(err) = result {
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log::error!("cargo check failed: {}", err)
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}
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(Progress::End, None)
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}
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};
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// When we're running multiple flychecks, we have to include a disambiguator in
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// the title, or the editor complains. Note that this is a user-facing string.
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let title = if self.flycheck.len() == 1 {
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"cargo check".to_string()
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} else {
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format!("cargo check (#{})", id + 1)
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};
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self.report_progress(&title, state, message, None);
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}
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},
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}
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let state_changed = self.process_changes();
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if prev_status == Status::Loading && self.status == Status::Ready {
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for flycheck in &self.flycheck {
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flycheck.update();
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}
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}
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if self.status == Status::Ready && (state_changed || prev_status == Status::Loading) {
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let subscriptions = self
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.mem_docs
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.keys()
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.map(|path| self.vfs.read().0.file_id(&path).unwrap())
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.collect::<Vec<_>>();
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self.update_file_notifications_on_threadpool(subscriptions);
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}
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if let Some(diagnostic_changes) = self.diagnostics.take_changes() {
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for file_id in diagnostic_changes {
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let url = file_id_to_url(&self.vfs.read().0, file_id);
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let diagnostics = self.diagnostics.diagnostics_for(file_id).cloned().collect();
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let version = from_proto::vfs_path(&url)
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.map(|path| self.mem_docs.get(&path)?.version)
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.unwrap_or_default();
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self.send_notification::<lsp_types::notification::PublishDiagnostics>(
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lsp_types::PublishDiagnosticsParams { uri: url, diagnostics, version },
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);
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}
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}
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let loop_duration = loop_start.elapsed();
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if loop_duration > Duration::from_millis(100) {
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log::warn!("overly long loop turn: {:?}", loop_duration);
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if env::var("RA_PROFILE").is_ok() {
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self.show_message(
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lsp_types::MessageType::Error,
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format!("overly long loop turn: {:?}", loop_duration),
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)
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}
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}
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Ok(())
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}
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fn on_request(&mut self, request_received: Instant, req: Request) -> Result<()> {
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self.register_request(&req, request_received);
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if self.shutdown_requested {
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self.respond(Response::new_err(
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req.id,
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lsp_server::ErrorCode::InvalidRequest as i32,
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"Shutdown already requested.".to_owned(),
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));
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return Ok(());
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}
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if self.status == Status::Loading && req.method != "shutdown" {
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self.respond(lsp_server::Response::new_err(
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req.id,
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// FIXME: i32 should impl From<ErrorCode> (from() guarantees lossless conversion)
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lsp_server::ErrorCode::ContentModified as i32,
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"Rust Analyzer is still loading...".to_owned(),
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));
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return Ok(());
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}
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RequestDispatcher { req: Some(req), global_state: self }
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.on_sync::<lsp_ext::ReloadWorkspace>(|s, ()| Ok(s.fetch_workspaces()))?
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.on_sync::<lsp_ext::JoinLines>(|s, p| handlers::handle_join_lines(s.snapshot(), p))?
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.on_sync::<lsp_ext::OnEnter>(|s, p| handlers::handle_on_enter(s.snapshot(), p))?
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.on_sync::<lsp_types::request::Shutdown>(|s, ()| {
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s.shutdown_requested = true;
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Ok(())
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})?
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.on_sync::<lsp_types::request::SelectionRangeRequest>(|s, p| {
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handlers::handle_selection_range(s.snapshot(), p)
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})?
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.on_sync::<lsp_ext::MatchingBrace>(|s, p| {
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handlers::handle_matching_brace(s.snapshot(), p)
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})?
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.on_sync::<lsp_ext::MemoryUsage>(|s, p| handlers::handle_memory_usage(s, p))?
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.on::<lsp_ext::AnalyzerStatus>(handlers::handle_analyzer_status)?
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.on::<lsp_ext::SyntaxTree>(handlers::handle_syntax_tree)?
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.on::<lsp_ext::ExpandMacro>(handlers::handle_expand_macro)?
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.on::<lsp_ext::ParentModule>(handlers::handle_parent_module)?
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.on::<lsp_ext::Runnables>(handlers::handle_runnables)?
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.on::<lsp_ext::InlayHints>(handlers::handle_inlay_hints)?
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.on::<lsp_ext::CodeActionRequest>(handlers::handle_code_action)?
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.on::<lsp_ext::ResolveCodeActionRequest>(handlers::handle_resolve_code_action)?
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.on::<lsp_ext::HoverRequest>(handlers::handle_hover)?
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.on::<lsp_ext::OpenDocs>(handlers::handle_open_docs)?
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.on::<lsp_types::request::OnTypeFormatting>(handlers::handle_on_type_formatting)?
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.on::<lsp_types::request::DocumentSymbolRequest>(handlers::handle_document_symbol)?
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.on::<lsp_types::request::WorkspaceSymbol>(handlers::handle_workspace_symbol)?
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.on::<lsp_types::request::GotoDefinition>(handlers::handle_goto_definition)?
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.on::<lsp_types::request::GotoImplementation>(handlers::handle_goto_implementation)?
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.on::<lsp_types::request::GotoTypeDefinition>(handlers::handle_goto_type_definition)?
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.on::<lsp_types::request::Completion>(handlers::handle_completion)?
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.on::<lsp_types::request::CodeLensRequest>(handlers::handle_code_lens)?
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.on::<lsp_types::request::CodeLensResolve>(handlers::handle_code_lens_resolve)?
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.on::<lsp_types::request::FoldingRangeRequest>(handlers::handle_folding_range)?
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.on::<lsp_types::request::SignatureHelpRequest>(handlers::handle_signature_help)?
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.on::<lsp_types::request::PrepareRenameRequest>(handlers::handle_prepare_rename)?
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.on::<lsp_types::request::Rename>(handlers::handle_rename)?
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.on::<lsp_types::request::References>(handlers::handle_references)?
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.on::<lsp_types::request::Formatting>(handlers::handle_formatting)?
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.on::<lsp_types::request::DocumentHighlightRequest>(
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handlers::handle_document_highlight,
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)?
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.on::<lsp_types::request::CallHierarchyPrepare>(
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handlers::handle_call_hierarchy_prepare,
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)?
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.on::<lsp_types::request::CallHierarchyIncomingCalls>(
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handlers::handle_call_hierarchy_incoming,
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)?
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.on::<lsp_types::request::CallHierarchyOutgoingCalls>(
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handlers::handle_call_hierarchy_outgoing,
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)?
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.on::<lsp_types::request::SemanticTokensFullRequest>(
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handlers::handle_semantic_tokens_full,
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)?
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.on::<lsp_types::request::SemanticTokensFullDeltaRequest>(
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handlers::handle_semantic_tokens_full_delta,
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)?
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.on::<lsp_types::request::SemanticTokensRangeRequest>(
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handlers::handle_semantic_tokens_range,
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)?
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.on::<lsp_ext::Ssr>(handlers::handle_ssr)?
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.finish();
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Ok(())
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}
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fn on_notification(&mut self, not: Notification) -> Result<()> {
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NotificationDispatcher { not: Some(not), global_state: self }
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.on::<lsp_types::notification::Cancel>(|this, params| {
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let id: lsp_server::RequestId = match params.id {
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lsp_types::NumberOrString::Number(id) => id.into(),
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lsp_types::NumberOrString::String(id) => id.into(),
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};
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this.cancel(id);
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Ok(())
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})?
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.on::<lsp_types::notification::DidOpenTextDocument>(|this, params| {
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if let Ok(path) = from_proto::vfs_path(¶ms.text_document.uri) {
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if this
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.mem_docs
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.insert(path.clone(), DocumentData::new(params.text_document.version))
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.is_some()
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{
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log::error!("duplicate DidOpenTextDocument: {}", path)
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}
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this.vfs
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.write()
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.0
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.set_file_contents(path, Some(params.text_document.text.into_bytes()));
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}
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Ok(())
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})?
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.on::<lsp_types::notification::DidChangeTextDocument>(|this, params| {
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if let Ok(path) = from_proto::vfs_path(¶ms.text_document.uri) {
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let doc = this.mem_docs.get_mut(&path).unwrap();
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let vfs = &mut this.vfs.write().0;
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let file_id = vfs.file_id(&path).unwrap();
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let mut text = String::from_utf8(vfs.file_contents(file_id).to_vec()).unwrap();
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apply_document_changes(&mut text, params.content_changes);
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|
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// The version passed in DidChangeTextDocument is the version after all edits are applied
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// so we should apply it before the vfs is notified.
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doc.version = params.text_document.version;
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|
|
|
vfs.set_file_contents(path.clone(), Some(text.into_bytes()));
|
|
}
|
|
Ok(())
|
|
})?
|
|
.on::<lsp_types::notification::DidCloseTextDocument>(|this, params| {
|
|
let mut version = None;
|
|
if let Ok(path) = from_proto::vfs_path(¶ms.text_document.uri) {
|
|
match this.mem_docs.remove(&path) {
|
|
Some(doc) => version = doc.version,
|
|
None => log::error!("orphan DidCloseTextDocument: {}", path),
|
|
}
|
|
|
|
this.semantic_tokens_cache.lock().remove(¶ms.text_document.uri);
|
|
|
|
if let Some(path) = path.as_path() {
|
|
this.loader.handle.invalidate(path.to_path_buf());
|
|
}
|
|
}
|
|
|
|
// Clear the diagnostics for the previously known version of the file.
|
|
// This prevents stale "cargo check" diagnostics if the file is
|
|
// closed, "cargo check" is run and then the file is reopened.
|
|
this.send_notification::<lsp_types::notification::PublishDiagnostics>(
|
|
lsp_types::PublishDiagnosticsParams {
|
|
uri: params.text_document.uri,
|
|
diagnostics: Vec::new(),
|
|
version,
|
|
},
|
|
);
|
|
Ok(())
|
|
})?
|
|
.on::<lsp_types::notification::DidSaveTextDocument>(|this, params| {
|
|
for flycheck in &this.flycheck {
|
|
flycheck.update();
|
|
}
|
|
if let Ok(abs_path) = from_proto::abs_path(¶ms.text_document.uri) {
|
|
this.maybe_refresh(&[(abs_path, ChangeKind::Modify)]);
|
|
}
|
|
Ok(())
|
|
})?
|
|
.on::<lsp_types::notification::DidChangeConfiguration>(|this, _params| {
|
|
// As stated in https://github.com/microsoft/language-server-protocol/issues/676,
|
|
// this notification's parameters should be ignored and the actual config queried separately.
|
|
this.send_request::<lsp_types::request::WorkspaceConfiguration>(
|
|
lsp_types::ConfigurationParams {
|
|
items: vec![lsp_types::ConfigurationItem {
|
|
scope_uri: None,
|
|
section: Some("rust-analyzer".to_string()),
|
|
}],
|
|
},
|
|
|this, resp| {
|
|
log::debug!("config update response: '{:?}", resp);
|
|
let Response { error, result, .. } = resp;
|
|
|
|
match (error, result) {
|
|
(Some(err), _) => {
|
|
log::error!("failed to fetch the server settings: {:?}", err)
|
|
}
|
|
(None, Some(mut configs)) => {
|
|
if let Some(json) = configs.get_mut(0) {
|
|
// Note that json can be null according to the spec if the client can't
|
|
// provide a configuration. This is handled in Config::update below.
|
|
let mut config = this.config.clone();
|
|
config.update(json.take());
|
|
this.update_configuration(config);
|
|
}
|
|
}
|
|
(None, None) => log::error!(
|
|
"received empty server settings response from the client"
|
|
),
|
|
}
|
|
},
|
|
);
|
|
|
|
return Ok(());
|
|
})?
|
|
.on::<lsp_types::notification::DidChangeWatchedFiles>(|this, params| {
|
|
for change in params.changes {
|
|
if let Ok(path) = from_proto::abs_path(&change.uri) {
|
|
this.loader.handle.invalidate(path);
|
|
}
|
|
}
|
|
Ok(())
|
|
})?
|
|
.finish();
|
|
Ok(())
|
|
}
|
|
fn update_file_notifications_on_threadpool(&mut self, subscriptions: Vec<FileId>) {
|
|
log::trace!("updating notifications for {:?}", subscriptions);
|
|
if self.config.publish_diagnostics {
|
|
let snapshot = self.snapshot();
|
|
let subscriptions = subscriptions.clone();
|
|
self.task_pool.handle.spawn(move || {
|
|
let diagnostics = subscriptions
|
|
.into_iter()
|
|
.filter_map(|file_id| {
|
|
handlers::publish_diagnostics(&snapshot, file_id)
|
|
.map_err(|err| {
|
|
if !is_canceled(&*err) {
|
|
log::error!("failed to compute diagnostics: {:?}", err);
|
|
}
|
|
()
|
|
})
|
|
.ok()
|
|
.map(|diags| (file_id, diags))
|
|
})
|
|
.collect::<Vec<_>>();
|
|
Task::Diagnostics(diagnostics)
|
|
})
|
|
}
|
|
self.task_pool.handle.spawn({
|
|
let subs = subscriptions;
|
|
let snap = self.snapshot();
|
|
move || {
|
|
snap.analysis.prime_caches(subs).unwrap_or_else(|_: Canceled| ());
|
|
Task::Unit
|
|
}
|
|
});
|
|
}
|
|
}
|