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|
//! The main loop of `ra_lsp_server` responsible for dispatching LSP requests/replies and
//! notifications back to the client.
mod handlers;
mod subscriptions;
pub(crate) mod pending_requests;
use std::{error::Error, fmt, panic, path::PathBuf, sync::Arc, time::Instant};
use crossbeam_channel::{select, unbounded, RecvError, Sender};
use lsp_server::{Connection, ErrorCode, Message, Notification, Request, RequestId, Response};
use lsp_types::{ClientCapabilities, NumberOrString};
use ra_ide::{Canceled, FeatureFlags, FileId, LibraryData, SourceRootId};
use ra_prof::profile;
use ra_vfs::{VfsTask, Watch};
use relative_path::RelativePathBuf;
use rustc_hash::FxHashSet;
use serde::{de::DeserializeOwned, Serialize};
use threadpool::ThreadPool;
use crate::{
main_loop::{
pending_requests::{PendingRequest, PendingRequests},
subscriptions::Subscriptions,
},
req,
world::{Options, WorldSnapshot, WorldState},
Result, ServerConfig,
};
const THREADPOOL_SIZE: usize = 8;
const MAX_IN_FLIGHT_LIBS: usize = THREADPOOL_SIZE - 3;
#[derive(Debug)]
pub struct LspError {
pub code: i32,
pub message: String,
}
impl LspError {
pub fn new(code: i32, message: String) -> LspError {
LspError { code, message }
}
}
impl fmt::Display for LspError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Language Server request failed with {}. ({})", self.code, self.message)
}
}
impl Error for LspError {}
pub fn main_loop(
ws_roots: Vec<PathBuf>,
client_caps: ClientCapabilities,
config: ServerConfig,
connection: Connection,
) -> Result<()> {
log::info!("server_config: {:#?}", config);
let mut loop_state = LoopState::default();
let mut world_state = {
// FIXME: support dynamic workspace loading.
let workspaces = {
let mut loaded_workspaces = Vec::new();
for ws_root in &ws_roots {
let workspace = ra_project_model::ProjectWorkspace::discover_with_sysroot(
ws_root.as_path(),
config.with_sysroot,
&config.cargo_features,
);
match workspace {
Ok(workspace) => loaded_workspaces.push(workspace),
Err(e) => {
log::error!("loading workspace failed: {}", e);
show_message(
req::MessageType::Error,
format!("rust-analyzer failed to load workspace: {}", e),
&connection.sender,
);
}
}
}
loaded_workspaces
};
let globs = config
.exclude_globs
.iter()
.map(|glob| ra_vfs_glob::Glob::new(glob))
.collect::<std::result::Result<Vec<_>, _>>()?;
if config.use_client_watching {
let registration_options = req::DidChangeWatchedFilesRegistrationOptions {
watchers: workspaces
.iter()
.flat_map(|ws| ws.to_roots())
.filter(|root| root.is_member())
.map(|root| format!("{}/**/*.rs", root.path().display()))
.map(|glob_pattern| req::FileSystemWatcher { glob_pattern, kind: None })
.collect(),
};
let registration = req::Registration {
id: "file-watcher".to_string(),
method: "workspace/didChangeWatchedFiles".to_string(),
register_options: Some(serde_json::to_value(registration_options).unwrap()),
};
let params = req::RegistrationParams { registrations: vec![registration] };
let request =
request_new::<req::RegisterCapability>(loop_state.next_request_id(), params);
connection.sender.send(request.into()).unwrap();
}
let options = {
let text_document_caps = client_caps.text_document.as_ref();
Options {
publish_decorations: config.publish_decorations,
supports_location_link: text_document_caps
.and_then(|it| it.definition)
.and_then(|it| it.link_support)
.unwrap_or(false),
line_folding_only: text_document_caps
.and_then(|it| it.folding_range.as_ref())
.and_then(|it| it.line_folding_only)
.unwrap_or(false),
max_inlay_hint_length: config.max_inlay_hint_length,
}
};
let feature_flags = {
let mut ff = FeatureFlags::default();
for (flag, value) in config.feature_flags {
if ff.set(flag.as_str(), value).is_err() {
log::error!("unknown feature flag: {:?}", flag);
show_message(
req::MessageType::Error,
format!("unknown feature flag: {:?}", flag),
&connection.sender,
);
}
}
ff
};
log::info!("feature_flags: {:#?}", feature_flags);
WorldState::new(
ws_roots,
workspaces,
config.lru_capacity,
&globs,
Watch(!config.use_client_watching),
options,
feature_flags,
)
};
let pool = ThreadPool::new(THREADPOOL_SIZE);
let (task_sender, task_receiver) = unbounded::<Task>();
let (libdata_sender, libdata_receiver) = unbounded::<LibraryData>();
log::info!("server initialized, serving requests");
{
let task_sender = task_sender;
let libdata_sender = libdata_sender;
loop {
log::trace!("selecting");
let event = select! {
recv(&connection.receiver) -> msg => match msg {
Ok(msg) => Event::Msg(msg),
Err(RecvError) => Err("client exited without shutdown")?,
},
recv(task_receiver) -> task => Event::Task(task.unwrap()),
recv(world_state.task_receiver) -> task => match task {
Ok(task) => Event::Vfs(task),
Err(RecvError) => Err("vfs died")?,
},
recv(libdata_receiver) -> data => Event::Lib(data.unwrap())
};
if let Event::Msg(Message::Request(req)) = &event {
if connection.handle_shutdown(&req)? {
break;
};
}
loop_turn(
&pool,
&task_sender,
&libdata_sender,
&connection,
&mut world_state,
&mut loop_state,
event,
)?;
}
}
log::info!("waiting for tasks to finish...");
task_receiver.into_iter().for_each(|task| {
on_task(task, &connection.sender, &mut loop_state.pending_requests, &mut world_state)
});
libdata_receiver.into_iter().for_each(drop);
log::info!("...tasks have finished");
log::info!("joining threadpool...");
drop(pool);
log::info!("...threadpool has finished");
let vfs = Arc::try_unwrap(world_state.vfs).expect("all snapshots should be dead");
drop(vfs);
Ok(())
}
#[derive(Debug)]
enum Task {
Respond(Response),
Notify(Notification),
}
enum Event {
Msg(Message),
Task(Task),
Vfs(VfsTask),
Lib(LibraryData),
}
impl fmt::Debug for Event {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let debug_verbose_not = |not: &Notification, f: &mut fmt::Formatter| {
f.debug_struct("Notification").field("method", ¬.method).finish()
};
match self {
Event::Msg(Message::Notification(not)) => {
if notification_is::<req::DidOpenTextDocument>(not)
|| notification_is::<req::DidChangeTextDocument>(not)
{
return debug_verbose_not(not, f);
}
}
Event::Task(Task::Notify(not)) => {
if notification_is::<req::PublishDecorations>(not)
|| notification_is::<req::PublishDiagnostics>(not)
{
return debug_verbose_not(not, f);
}
}
Event::Task(Task::Respond(resp)) => {
return f
.debug_struct("Response")
.field("id", &resp.id)
.field("error", &resp.error)
.finish();
}
_ => (),
}
match self {
Event::Msg(it) => fmt::Debug::fmt(it, f),
Event::Task(it) => fmt::Debug::fmt(it, f),
Event::Vfs(it) => fmt::Debug::fmt(it, f),
Event::Lib(it) => fmt::Debug::fmt(it, f),
}
}
}
#[derive(Debug, Default)]
struct LoopState {
next_request_id: u64,
pending_responses: FxHashSet<RequestId>,
pending_requests: PendingRequests,
subscriptions: Subscriptions,
// We try not to index more than MAX_IN_FLIGHT_LIBS libraries at the same
// time to always have a thread ready to react to input.
in_flight_libraries: usize,
pending_libraries: Vec<(SourceRootId, Vec<(FileId, RelativePathBuf, Arc<String>)>)>,
workspace_loaded: bool,
}
impl LoopState {
fn next_request_id(&mut self) -> RequestId {
self.next_request_id += 1;
let res: RequestId = self.next_request_id.into();
let inserted = self.pending_responses.insert(res.clone());
assert!(inserted);
res
}
}
fn loop_turn(
pool: &ThreadPool,
task_sender: &Sender<Task>,
libdata_sender: &Sender<LibraryData>,
connection: &Connection,
world_state: &mut WorldState,
loop_state: &mut LoopState,
event: Event,
) -> Result<()> {
let loop_start = Instant::now();
// NOTE: don't count blocking select! call as a loop-turn time
let _p = profile("main_loop_inner/loop-turn");
log::info!("loop turn = {:?}", event);
let queue_count = pool.queued_count();
if queue_count > 0 {
log::info!("queued count = {}", queue_count);
}
let mut state_changed = false;
match event {
Event::Task(task) => {
on_task(task, &connection.sender, &mut loop_state.pending_requests, world_state);
world_state.maybe_collect_garbage();
}
Event::Vfs(task) => {
world_state.vfs.write().handle_task(task);
state_changed = true;
}
Event::Lib(lib) => {
world_state.add_lib(lib);
world_state.maybe_collect_garbage();
loop_state.in_flight_libraries -= 1;
}
Event::Msg(msg) => match msg {
Message::Request(req) => on_request(
world_state,
&mut loop_state.pending_requests,
pool,
task_sender,
&connection.sender,
loop_start,
req,
)?,
Message::Notification(not) => {
on_notification(
&connection.sender,
world_state,
&mut loop_state.pending_requests,
&mut loop_state.subscriptions,
not,
)?;
state_changed = true;
}
Message::Response(resp) => {
let removed = loop_state.pending_responses.remove(&resp.id);
if !removed {
log::error!("unexpected response: {:?}", resp)
}
}
},
};
loop_state.pending_libraries.extend(world_state.process_changes());
while loop_state.in_flight_libraries < MAX_IN_FLIGHT_LIBS
&& !loop_state.pending_libraries.is_empty()
{
let (root, files) = loop_state.pending_libraries.pop().unwrap();
loop_state.in_flight_libraries += 1;
let sender = libdata_sender.clone();
pool.execute(move || {
log::info!("indexing {:?} ... ", root);
let _p = profile(&format!("indexed {:?}", root));
let data = LibraryData::prepare(root, files);
sender.send(data).unwrap();
});
}
if !loop_state.workspace_loaded
&& world_state.roots_to_scan == 0
&& loop_state.pending_libraries.is_empty()
&& loop_state.in_flight_libraries == 0
{
loop_state.workspace_loaded = true;
let n_packages: usize = world_state.workspaces.iter().map(|it| it.n_packages()).sum();
if world_state.feature_flags().get("notifications.workspace-loaded") {
let msg = format!("workspace loaded, {} rust packages", n_packages);
show_message(req::MessageType::Info, msg, &connection.sender);
}
}
if state_changed {
update_file_notifications_on_threadpool(
pool,
world_state.snapshot(),
world_state.options.publish_decorations,
task_sender.clone(),
loop_state.subscriptions.subscriptions(),
)
}
Ok(())
}
fn on_task(
task: Task,
msg_sender: &Sender<Message>,
pending_requests: &mut PendingRequests,
state: &mut WorldState,
) {
match task {
Task::Respond(response) => {
if let Some(completed) = pending_requests.finish(&response.id) {
log::info!("handled req#{} in {:?}", completed.id, completed.duration);
state.complete_request(completed);
msg_sender.send(response.into()).unwrap();
}
}
Task::Notify(n) => {
msg_sender.send(n.into()).unwrap();
}
}
}
fn on_request(
world: &mut WorldState,
pending_requests: &mut PendingRequests,
pool: &ThreadPool,
sender: &Sender<Task>,
msg_sender: &Sender<Message>,
request_received: Instant,
req: Request,
) -> Result<()> {
let mut pool_dispatcher = PoolDispatcher {
req: Some(req),
pool,
world,
sender,
msg_sender,
pending_requests,
request_received,
};
pool_dispatcher
.on_sync::<req::CollectGarbage>(|s, ()| Ok(s.collect_garbage()))?
.on_sync::<req::JoinLines>(|s, p| handlers::handle_join_lines(s.snapshot(), p))?
.on_sync::<req::OnEnter>(|s, p| handlers::handle_on_enter(s.snapshot(), p))?
.on_sync::<req::SelectionRangeRequest>(|s, p| {
handlers::handle_selection_range(s.snapshot(), p)
})?
.on_sync::<req::FindMatchingBrace>(|s, p| {
handlers::handle_find_matching_brace(s.snapshot(), p)
})?
.on::<req::AnalyzerStatus>(handlers::handle_analyzer_status)?
.on::<req::SyntaxTree>(handlers::handle_syntax_tree)?
.on::<req::ExpandMacro>(handlers::handle_expand_macro)?
.on::<req::OnTypeFormatting>(handlers::handle_on_type_formatting)?
.on::<req::DocumentSymbolRequest>(handlers::handle_document_symbol)?
.on::<req::WorkspaceSymbol>(handlers::handle_workspace_symbol)?
.on::<req::GotoDefinition>(handlers::handle_goto_definition)?
.on::<req::GotoImplementation>(handlers::handle_goto_implementation)?
.on::<req::GotoTypeDefinition>(handlers::handle_goto_type_definition)?
.on::<req::ParentModule>(handlers::handle_parent_module)?
.on::<req::Runnables>(handlers::handle_runnables)?
.on::<req::DecorationsRequest>(handlers::handle_decorations)?
.on::<req::Completion>(handlers::handle_completion)?
.on::<req::CodeActionRequest>(handlers::handle_code_action)?
.on::<req::CodeLensRequest>(handlers::handle_code_lens)?
.on::<req::CodeLensResolve>(handlers::handle_code_lens_resolve)?
.on::<req::FoldingRangeRequest>(handlers::handle_folding_range)?
.on::<req::SignatureHelpRequest>(handlers::handle_signature_help)?
.on::<req::HoverRequest>(handlers::handle_hover)?
.on::<req::PrepareRenameRequest>(handlers::handle_prepare_rename)?
.on::<req::Rename>(handlers::handle_rename)?
.on::<req::References>(handlers::handle_references)?
.on::<req::Formatting>(handlers::handle_formatting)?
.on::<req::DocumentHighlightRequest>(handlers::handle_document_highlight)?
.on::<req::InlayHints>(handlers::handle_inlay_hints)?
.finish();
Ok(())
}
fn on_notification(
msg_sender: &Sender<Message>,
state: &mut WorldState,
pending_requests: &mut PendingRequests,
subs: &mut Subscriptions,
not: Notification,
) -> Result<()> {
let not = match notification_cast::<req::Cancel>(not) {
Ok(params) => {
let id: RequestId = match params.id {
NumberOrString::Number(id) => id.into(),
NumberOrString::String(id) => id.into(),
};
if pending_requests.cancel(&id) {
let response = Response::new_err(
id,
ErrorCode::RequestCanceled as i32,
"canceled by client".to_string(),
);
msg_sender.send(response.into()).unwrap()
}
return Ok(());
}
Err(not) => not,
};
let not = match notification_cast::<req::DidOpenTextDocument>(not) {
Ok(params) => {
let uri = params.text_document.uri;
let path = uri.to_file_path().map_err(|()| format!("invalid uri: {}", uri))?;
if let Some(file_id) =
state.vfs.write().add_file_overlay(&path, params.text_document.text)
{
subs.add_sub(FileId(file_id.0));
}
return Ok(());
}
Err(not) => not,
};
let not = match notification_cast::<req::DidChangeTextDocument>(not) {
Ok(mut params) => {
let uri = params.text_document.uri;
let path = uri.to_file_path().map_err(|()| format!("invalid uri: {}", uri))?;
let text =
params.content_changes.pop().ok_or_else(|| "empty changes".to_string())?.text;
state.vfs.write().change_file_overlay(path.as_path(), text);
return Ok(());
}
Err(not) => not,
};
let not = match notification_cast::<req::DidCloseTextDocument>(not) {
Ok(params) => {
let uri = params.text_document.uri;
let path = uri.to_file_path().map_err(|()| format!("invalid uri: {}", uri))?;
if let Some(file_id) = state.vfs.write().remove_file_overlay(path.as_path()) {
subs.remove_sub(FileId(file_id.0));
}
let params =
req::PublishDiagnosticsParams { uri, diagnostics: Vec::new(), version: None };
let not = notification_new::<req::PublishDiagnostics>(params);
msg_sender.send(not.into()).unwrap();
return Ok(());
}
Err(not) => not,
};
let not = match notification_cast::<req::DidChangeConfiguration>(not) {
Ok(_params) => {
return Ok(());
}
Err(not) => not,
};
let not = match notification_cast::<req::DidChangeWatchedFiles>(not) {
Ok(params) => {
let mut vfs = state.vfs.write();
for change in params.changes {
let uri = change.uri;
let path = uri.to_file_path().map_err(|()| format!("invalid uri: {}", uri))?;
vfs.notify_changed(path)
}
return Ok(());
}
Err(not) => not,
};
log::error!("unhandled notification: {:?}", not);
Ok(())
}
struct PoolDispatcher<'a> {
req: Option<Request>,
pool: &'a ThreadPool,
world: &'a mut WorldState,
pending_requests: &'a mut PendingRequests,
msg_sender: &'a Sender<Message>,
sender: &'a Sender<Task>,
request_received: Instant,
}
impl<'a> PoolDispatcher<'a> {
/// Dispatches the request onto the current thread
fn on_sync<R>(
&mut self,
f: fn(&mut WorldState, R::Params) -> Result<R::Result>,
) -> Result<&mut Self>
where
R: req::Request + 'static,
R::Params: DeserializeOwned + panic::UnwindSafe + 'static,
R::Result: Serialize + 'static,
{
let (id, params) = match self.parse::<R>() {
Some(it) => it,
None => {
return Ok(self);
}
};
let world = panic::AssertUnwindSafe(&mut *self.world);
let task = panic::catch_unwind(move || {
let result = f(world.0, params);
result_to_task::<R>(id, result)
})
.map_err(|_| format!("sync task {:?} panicked", R::METHOD))?;
on_task(task, self.msg_sender, self.pending_requests, self.world);
Ok(self)
}
/// Dispatches the request onto thread pool
fn on<R>(&mut self, f: fn(WorldSnapshot, R::Params) -> Result<R::Result>) -> Result<&mut Self>
where
R: req::Request + 'static,
R::Params: DeserializeOwned + Send + 'static,
R::Result: Serialize + 'static,
{
let (id, params) = match self.parse::<R>() {
Some(it) => it,
None => {
return Ok(self);
}
};
self.pool.execute({
let world = self.world.snapshot();
let sender = self.sender.clone();
move || {
let result = f(world, params);
let task = result_to_task::<R>(id, result);
sender.send(task).unwrap();
}
});
Ok(self)
}
fn parse<R>(&mut self) -> Option<(RequestId, R::Params)>
where
R: req::Request + 'static,
R::Params: DeserializeOwned + 'static,
{
let req = self.req.take()?;
let (id, params) = match req.extract::<R::Params>(R::METHOD) {
Ok(it) => it,
Err(req) => {
self.req = Some(req);
return None;
}
};
self.pending_requests.start(PendingRequest {
id: id.clone(),
method: R::METHOD.to_string(),
received: self.request_received,
});
Some((id, params))
}
fn finish(&mut self) {
match self.req.take() {
None => (),
Some(req) => {
log::error!("unknown request: {:?}", req);
let resp = Response::new_err(
req.id,
ErrorCode::MethodNotFound as i32,
"unknown request".to_string(),
);
self.msg_sender.send(resp.into()).unwrap();
}
}
}
}
fn result_to_task<R>(id: RequestId, result: Result<R::Result>) -> Task
where
R: req::Request + 'static,
R::Params: DeserializeOwned + 'static,
R::Result: Serialize + 'static,
{
let response = match result {
Ok(resp) => Response::new_ok(id, &resp),
Err(e) => match e.downcast::<LspError>() {
Ok(lsp_error) => Response::new_err(id, lsp_error.code, lsp_error.message),
Err(e) => {
if is_canceled(&e) {
// FIXME: When https://github.com/Microsoft/vscode-languageserver-node/issues/457
// gets fixed, we can return the proper response.
// This works around the issue where "content modified" error would continuously
// show an message pop-up in VsCode
// Response::err(
// id,
// ErrorCode::ContentModified as i32,
// "content modified".to_string(),
// )
Response::new_ok(id, ())
} else {
Response::new_err(id, ErrorCode::InternalError as i32, e.to_string())
}
}
},
};
Task::Respond(response)
}
fn update_file_notifications_on_threadpool(
pool: &ThreadPool,
world: WorldSnapshot,
publish_decorations: bool,
sender: Sender<Task>,
subscriptions: Vec<FileId>,
) {
log::trace!("updating notifications for {:?}", subscriptions);
let publish_diagnostics = world.feature_flags().get("lsp.diagnostics");
pool.execute(move || {
for file_id in subscriptions {
if publish_diagnostics {
match handlers::publish_diagnostics(&world, file_id) {
Err(e) => {
if !is_canceled(&e) {
log::error!("failed to compute diagnostics: {:?}", e);
}
}
Ok(params) => {
let not = notification_new::<req::PublishDiagnostics>(params);
sender.send(Task::Notify(not)).unwrap();
}
}
}
if publish_decorations {
match handlers::publish_decorations(&world, file_id) {
Err(e) => {
if !is_canceled(&e) {
log::error!("failed to compute decorations: {:?}", e);
}
}
Ok(params) => {
let not = notification_new::<req::PublishDecorations>(params);
sender.send(Task::Notify(not)).unwrap();
}
}
}
}
});
}
pub fn show_message(typ: req::MessageType, message: impl Into<String>, sender: &Sender<Message>) {
let message = message.into();
let params = req::ShowMessageParams { typ, message };
let not = notification_new::<req::ShowMessage>(params);
sender.send(not.into()).unwrap();
}
fn is_canceled(e: &Box<dyn std::error::Error + Send + Sync>) -> bool {
e.downcast_ref::<Canceled>().is_some()
}
fn notification_is<N: lsp_types::notification::Notification>(notification: &Notification) -> bool {
notification.method == N::METHOD
}
fn notification_cast<N>(notification: Notification) -> std::result::Result<N::Params, Notification>
where
N: lsp_types::notification::Notification,
N::Params: DeserializeOwned,
{
notification.extract(N::METHOD)
}
fn notification_new<N>(params: N::Params) -> Notification
where
N: lsp_types::notification::Notification,
N::Params: Serialize,
{
Notification::new(N::METHOD.to_string(), params)
}
fn request_new<R>(id: RequestId, params: R::Params) -> Request
where
R: lsp_types::request::Request,
R::Params: Serialize,
{
Request::new(id, R::METHOD.to_string(), params)
}
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