mod handlers; mod subscriptions; use std::{fmt, path::PathBuf, sync::Arc}; use crossbeam_channel::{select, unbounded, Receiver, RecvError, Sender}; use failure::{bail, format_err}; use failure_derive::Fail; use gen_lsp_server::{ handle_shutdown, ErrorCode, RawMessage, RawNotification, RawRequest, RawResponse, }; use lsp_types::NumberOrString; use ra_ide_api::{Canceled, FileId, LibraryData}; use ra_vfs::VfsTask; use rustc_hash::FxHashSet; use serde::{de::DeserializeOwned, Serialize}; use threadpool::ThreadPool; use crate::{ main_loop::subscriptions::Subscriptions, project_model::workspace_loader, req, server_world::{ServerWorld, ServerWorldState}, Result, }; #[derive(Debug, Fail)] #[fail( display = "Language Server request failed with {}. ({})", code, message )] pub struct LspError { pub code: i32, pub message: String, } impl LspError { pub fn new(code: i32, message: String) -> LspError { LspError { code, message } } } #[derive(Debug)] enum Task { Respond(RawResponse), Notify(RawNotification), } const THREADPOOL_SIZE: usize = 8; pub fn main_loop( internal_mode: bool, ws_root: PathBuf, supports_decorations: bool, msg_receiver: &Receiver, msg_sender: &Sender, ) -> Result<()> { let pool = ThreadPool::new(THREADPOOL_SIZE); let (task_sender, task_receiver) = unbounded::(); let (ws_worker, ws_watcher) = workspace_loader(); ws_worker.send(ws_root.clone()).unwrap(); // FIXME: support dynamic workspace loading. let workspaces = match ws_worker.recv().unwrap() { Ok(ws) => vec![ws], Err(e) => { log::error!("loading workspace failed: {}", e); Vec::new() } }; ws_worker.shutdown(); ws_watcher .shutdown() .map_err(|_| format_err!("ws watcher died"))?; let mut state = ServerWorldState::new(ws_root.clone(), workspaces); log::info!("server initialized, serving requests"); let mut pending_requests = FxHashSet::default(); let mut subs = Subscriptions::new(); let main_res = main_loop_inner( internal_mode, supports_decorations, &pool, msg_sender, msg_receiver, task_sender, task_receiver.clone(), &mut state, &mut pending_requests, &mut subs, ); log::info!("waiting for tasks to finish..."); task_receiver .into_iter() .for_each(|task| on_task(task, msg_sender, &mut pending_requests)); log::info!("...tasks have finished"); log::info!("joining threadpool..."); drop(pool); log::info!("...threadpool has finished"); let vfs = Arc::try_unwrap(state.vfs).expect("all snapshots should be dead"); let vfs_res = vfs.into_inner().shutdown(); main_res?; vfs_res.map_err(|_| format_err!("fs watcher died"))?; Ok(()) } enum Event { Msg(RawMessage), 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: &RawNotification, f: &mut fmt::Formatter| { f.debug_struct("RawNotification") .field("method", ¬.method) .finish() }; match self { Event::Msg(RawMessage::Notification(not)) => { if not.is::() || not.is::() { return debug_verbose_not(not, f); } } Event::Task(Task::Notify(not)) => { if not.is::() || not.is::() { return debug_verbose_not(not, f); } } Event::Task(Task::Respond(resp)) => { return f .debug_struct("RawResponse") .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), } } } fn main_loop_inner( internal_mode: bool, supports_decorations: bool, pool: &ThreadPool, msg_sender: &Sender, msg_receiver: &Receiver, task_sender: Sender, task_receiver: Receiver, state: &mut ServerWorldState, pending_requests: &mut FxHashSet, subs: &mut Subscriptions, ) -> Result<()> { // We try not to index more than THREADPOOL_SIZE - 3 libraries at the same // time to always have a thread ready to react to input. let mut in_flight_libraries = 0; let mut pending_libraries = Vec::new(); let (libdata_sender, libdata_receiver) = unbounded(); loop { state.maybe_collect_garbage(); log::trace!("selecting"); let event = select! { recv(msg_receiver) -> msg => match msg { Ok(msg) => Event::Msg(msg), Err(RecvError) => bail!("client exited without shutdown"), }, recv(task_receiver) -> task => Event::Task(task.unwrap()), recv(state.vfs.read().task_receiver()) -> task => match task { Ok(task) => Event::Vfs(task), Err(RecvError) => bail!("vfs died"), }, recv(libdata_receiver) -> data => Event::Lib(data.unwrap()) }; log::info!("loop_turn = {:?}", event); let start = std::time::Instant::now(); let mut state_changed = false; match event { Event::Task(task) => on_task(task, msg_sender, pending_requests), Event::Vfs(task) => { state.vfs.write().handle_task(task); state_changed = true; } Event::Lib(lib) => { feedback(internal_mode, "library loaded", msg_sender); state.add_lib(lib); in_flight_libraries -= 1; } Event::Msg(msg) => match msg { RawMessage::Request(req) => { let req = match handle_shutdown(req, msg_sender) { Some(req) => req, None => return Ok(()), }; match req.cast::() { Ok((id, ())) => { state.collect_garbage(); let resp = RawResponse::ok::(id, &()); msg_sender.send(RawMessage::Response(resp)).unwrap() } Err(req) => { match on_request(state, pending_requests, pool, &task_sender, req)? { None => (), Some(req) => { log::error!("unknown request: {:?}", req); let resp = RawResponse::err( req.id, ErrorCode::MethodNotFound as i32, "unknown request".to_string(), ); msg_sender.send(RawMessage::Response(resp)).unwrap() } } } } } RawMessage::Notification(not) => { on_notification(msg_sender, state, pending_requests, subs, not)?; state_changed = true; } RawMessage::Response(resp) => log::error!("unexpected response: {:?}", resp), }, }; pending_libraries.extend(state.process_changes()); while in_flight_libraries < THREADPOOL_SIZE - 3 && !pending_libraries.is_empty() { let (root, files) = pending_libraries.pop().unwrap(); in_flight_libraries += 1; let sender = libdata_sender.clone(); pool.execute(move || { let start = ::std::time::Instant::now(); log::info!("indexing {:?} ... ", root); let data = LibraryData::prepare(root, files); log::info!("indexed {:?} {:?}", start.elapsed(), root); sender.send(data).unwrap(); }); } if state.roots_to_scan == 0 && pending_libraries.is_empty() && in_flight_libraries == 0 { feedback(internal_mode, "workspace loaded", msg_sender); } if state_changed { update_file_notifications_on_threadpool( pool, state.snapshot(), supports_decorations, task_sender.clone(), subs.subscriptions(), ) } log::info!("loop_turn = {:?}", start.elapsed()); } } fn on_task(task: Task, msg_sender: &Sender, pending_requests: &mut FxHashSet) { match task { Task::Respond(response) => { if pending_requests.remove(&response.id) { msg_sender.send(RawMessage::Response(response)).unwrap(); } } Task::Notify(n) => { msg_sender.send(RawMessage::Notification(n)).unwrap(); } } } fn on_request( world: &mut ServerWorldState, pending_requests: &mut FxHashSet, pool: &ThreadPool, sender: &Sender, req: RawRequest, ) -> Result> { let mut pool_dispatcher = PoolDispatcher { req: Some(req), res: None, pool, world, sender, }; let req = pool_dispatcher .on::(handlers::handle_analyzer_status)? .on::(handlers::handle_syntax_tree)? .on::(handlers::handle_extend_selection)? .on::(handlers::handle_find_matching_brace)? .on::(handlers::handle_join_lines)? .on::(handlers::handle_on_enter)? .on::(handlers::handle_on_type_formatting)? .on::(handlers::handle_document_symbol)? .on::(handlers::handle_workspace_symbol)? .on::(handlers::handle_goto_definition)? .on::(handlers::handle_parent_module)? .on::(handlers::handle_runnables)? .on::(handlers::handle_decorations)? .on::(handlers::handle_completion)? .on::(handlers::handle_code_action)? .on::(handlers::handle_code_lens)? .on::(handlers::handle_folding_range)? .on::(handlers::handle_signature_help)? .on::(handlers::handle_hover)? .on::(handlers::handle_prepare_rename)? .on::(handlers::handle_rename)? .on::(handlers::handle_references)? .on::(handlers::handle_formatting)? .on::(handlers::handle_document_highlight)? .finish(); match req { Ok(id) => { let inserted = pending_requests.insert(id); assert!(inserted, "duplicate request: {}", id); Ok(None) } Err(req) => Ok(Some(req)), } } fn on_notification( msg_sender: &Sender, state: &mut ServerWorldState, pending_requests: &mut FxHashSet, subs: &mut Subscriptions, not: RawNotification, ) -> Result<()> { let not = match not.cast::() { Ok(params) => { let id = match params.id { NumberOrString::Number(id) => id, NumberOrString::String(id) => { panic!("string id's not supported: {:?}", id); } }; if pending_requests.remove(&id) { let response = RawResponse::err( id, ErrorCode::RequestCanceled as i32, "canceled by client".to_string(), ); msg_sender.send(RawMessage::Response(response)).unwrap() } return Ok(()); } Err(not) => not, }; let not = match not.cast::() { Ok(params) => { let uri = params.text_document.uri; let path = uri .to_file_path() .map_err(|()| format_err!("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.into())); } return Ok(()); } Err(not) => not, }; let not = match not.cast::() { Ok(mut params) => { let uri = params.text_document.uri; let path = uri .to_file_path() .map_err(|()| format_err!("invalid uri: {}", uri))?; let text = params .content_changes .pop() .ok_or_else(|| format_err!("empty changes"))? .text; state.vfs.write().change_file_overlay(path.as_path(), text); return Ok(()); } Err(not) => not, }; let not = match not.cast::() { Ok(params) => { let uri = params.text_document.uri; let path = uri .to_file_path() .map_err(|()| format_err!("invalid uri: {}", uri))?; if let Some(file_id) = state.vfs.write().remove_file_overlay(path.as_path()) { subs.remove_sub(FileId(file_id.0.into())); } let params = req::PublishDiagnosticsParams { uri, diagnostics: Vec::new(), }; let not = RawNotification::new::(¶ms); msg_sender.send(RawMessage::Notification(not)).unwrap(); return Ok(()); } Err(not) => not, }; log::error!("unhandled notification: {:?}", not); Ok(()) } struct PoolDispatcher<'a> { req: Option, res: Option, pool: &'a ThreadPool, world: &'a ServerWorldState, sender: &'a Sender, } impl<'a> PoolDispatcher<'a> { fn on(&mut self, f: fn(ServerWorld, R::Params) -> Result) -> Result<&mut Self> where R: req::Request, R::Params: DeserializeOwned + Send + 'static, R::Result: Serialize + 'static, { let req = match self.req.take() { None => return Ok(self), Some(req) => req, }; match req.cast::() { Ok((id, params)) => { let world = self.world.snapshot(); let sender = self.sender.clone(); self.pool.execute(move || { let resp = match f(world, params) { Ok(resp) => RawResponse::ok::(id, &resp), Err(e) => match e.downcast::() { Ok(lsp_error) => { RawResponse::err(id, lsp_error.code, lsp_error.message) } Err(e) => { if is_canceled(&e) { RawResponse::err( id, ErrorCode::ContentModified as i32, "content modified".to_string(), ) } else { RawResponse::err( id, ErrorCode::InternalError as i32, format!("{}\n{}", e, e.backtrace()), ) } } }, }; let task = Task::Respond(resp); sender.send(task).unwrap(); }); self.res = Some(id); } Err(req) => self.req = Some(req), } Ok(self) } fn finish(&mut self) -> ::std::result::Result { match (self.res.take(), self.req.take()) { (Some(res), None) => Ok(res), (None, Some(req)) => Err(req), _ => unreachable!(), } } } fn update_file_notifications_on_threadpool( pool: &ThreadPool, world: ServerWorld, publish_decorations: bool, sender: Sender, subscriptions: Vec, ) { pool.execute(move || { for file_id in subscriptions { match handlers::publish_diagnostics(&world, file_id) { Err(e) => { if !is_canceled(&e) { log::error!("failed to compute diagnostics: {:?}", e); } } Ok(params) => { let not = RawNotification::new::(¶ms); 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 = RawNotification::new::(¶ms); sender.send(Task::Notify(not)).unwrap(); } } } } }); } fn feedback(intrnal_mode: bool, msg: &str, sender: &Sender) { if !intrnal_mode { return; } let not = RawNotification::new::(&msg.to_string()); sender.send(RawMessage::Notification(not)).unwrap(); } fn is_canceled(e: &failure::Error) -> bool { e.downcast_ref::().is_some() }