mod handlers; use std::{ path::PathBuf, collections::{HashSet, HashMap}, }; use threadpool::ThreadPool; use crossbeam_channel::{Sender, Receiver}; use languageserver_types::Url; use libanalysis::{World, WorldState}; use serde_json::to_value; use { req, dispatch, Task, Result, io::{Io, RawMsg, RawRequest, RawNotification}, util::FilePath, vfs::{FileEvent, FileEventKind}, main_loop::handlers::{ handle_syntax_tree, handle_extend_selection, publish_diagnostics, publish_decorations, handle_document_symbol, handle_code_action, handle_execute_command, handle_workspace_symbol, }, }; pub(super) fn main_loop( io: &mut Io, world: &mut WorldState, pool: &mut ThreadPool, task_sender: Sender, task_receiver: Receiver, fs_events_receiver: Receiver>, ) -> Result<()> { info!("server initialized, serving requests"); let mut next_request_id = 0; let mut pending_requests: HashSet = HashSet::new(); let mut mem_map: HashMap> = HashMap::new(); let mut fs_events_receiver = Some(&fs_events_receiver); loop { enum Event { Msg(RawMsg), Task(Task), Fs(Vec), ReceiverDead, FsWatcherDead, } let event = select! { recv(io.receiver(), msg) => match msg { Some(msg) => Event::Msg(msg), None => Event::ReceiverDead, }, recv(task_receiver, task) => Event::Task(task.unwrap()), recv(fs_events_receiver, events) => match events { Some(events) => Event::Fs(events), None => Event::FsWatcherDead, } }; match event { Event::ReceiverDead => { io.cleanup_receiver()?; unreachable!(); } Event::FsWatcherDead => { fs_events_receiver = None; } Event::Task(task) => { match task { Task::Request(mut request) => { request.id = next_request_id; pending_requests.insert(next_request_id); next_request_id += 1; io.send(RawMsg::Request(request)); } Task::Respond(response) => io.send(RawMsg::Response(response)), Task::Notify(n) => io.send(RawMsg::Notification(n)), Task::Die(error) => return Err(error), } continue; } Event::Fs(events) => { trace!("fs change, {} events", events.len()); let changes = events.into_iter() .map(|event| { let text = match event.kind { FileEventKind::Add(text) => Some(text), FileEventKind::Remove => None, }; (event.path, text) }) .filter_map(|(path, text)| { if mem_map.contains_key(path.as_path()) { mem_map.insert(path, text); None } else { Some((path, text)) } }); world.change_files(changes); } Event::Msg(msg) => { match msg { RawMsg::Request(req) => { if !on_request(io, world, pool, &task_sender, req)? { return Ok(()); } } RawMsg::Notification(not) => { on_notification(io, world, pool, &task_sender, not, &mut mem_map)? } RawMsg::Response(resp) => { if !pending_requests.remove(&resp.id) { error!("unexpected response: {:?}", resp) } } } } }; } } fn on_request( io: &mut Io, world: &WorldState, pool: &ThreadPool, sender: &Sender, req: RawRequest, ) -> Result { let mut req = Some(req); handle_request_on_threadpool::( &mut req, pool, world, sender, handle_syntax_tree, )?; handle_request_on_threadpool::( &mut req, pool, world, sender, handle_extend_selection, )?; handle_request_on_threadpool::( &mut req, pool, world, sender, handle_document_symbol, )?; handle_request_on_threadpool::( &mut req, pool, world, sender, handle_code_action, )?; handle_request_on_threadpool::( &mut req, pool, world, sender, handle_workspace_symbol, )?; dispatch::handle_request::(&mut req, |params, resp| { io.send(RawMsg::Response(resp.into_response(Ok(None))?)); let world = world.snapshot(); let sender = sender.clone(); pool.execute(move || { let task = match handle_execute_command(world, params) { Ok(req) => match to_value(req) { Err(e) => Task::Die(e.into()), Ok(params) => { let request = RawRequest { id: 0, method: ::METHOD.to_string(), params, }; Task::Request(request) } }, Err(e) => Task::Die(e), }; sender.send(task) }); Ok(()) })?; let mut shutdown = false; dispatch::handle_request::(&mut req, |(), resp| { let resp = resp.into_response(Ok(()))?; io.send(RawMsg::Response(resp)); shutdown = true; Ok(()) })?; if shutdown { info!("lifecycle: initiating shutdown"); return Ok(false); } if let Some(req) = req { error!("unknown method: {:?}", req); io.send(RawMsg::Response(dispatch::unknown_method(req.id)?)); } Ok(true) } fn on_notification( io: &mut Io, world: &mut WorldState, pool: &ThreadPool, sender: &Sender, not: RawNotification, mem_map: &mut HashMap>, ) -> Result<()> { let mut not = Some(not); dispatch::handle_notification::(&mut not, |params| { let path = params.text_document.file_path()?; mem_map.insert(path.clone(), None); world.change_file(path, Some(params.text_document.text)); update_file_notifications_on_threadpool( pool, world.snapshot(), sender.clone(), params.text_document.uri, ); Ok(()) })?; dispatch::handle_notification::(&mut not, |mut params| { let path = params.text_document.file_path()?; let text = params.content_changes.pop() .ok_or_else(|| format_err!("empty changes"))? .text; world.change_file(path, Some(text)); update_file_notifications_on_threadpool( pool, world.snapshot(), sender.clone(), params.text_document.uri, ); Ok(()) })?; dispatch::handle_notification::(&mut not, |params| { let path = params.text_document.file_path()?; let text = match mem_map.remove(&path) { Some(text) => text, None => bail!("unmatched close notification"), }; world.change_file(path, text); let not = req::PublishDiagnosticsParams { uri: params.text_document.uri, diagnostics: Vec::new(), }; let not = dispatch::send_notification::(not); io.send(RawMsg::Notification(not)); Ok(()) })?; if let Some(not) = not { error!("unhandled notification: {:?}", not); } Ok(()) } fn handle_request_on_threadpool( req: &mut Option, pool: &ThreadPool, world: &WorldState, sender: &Sender, f: fn(World, R::Params) -> Result, ) -> Result<()> { dispatch::handle_request::(req, |params, resp| { let world = world.snapshot(); let sender = sender.clone(); pool.execute(move || { let res = f(world, params); let task = match resp.into_response(res) { Ok(resp) => Task::Respond(resp), Err(e) => Task::Die(e), }; sender.send(task); }); Ok(()) }) } fn update_file_notifications_on_threadpool( pool: &ThreadPool, world: World, sender: Sender, uri: Url, ) { pool.execute(move || { match publish_diagnostics(world.clone(), uri.clone()) { Err(e) => { error!("failed to compute diagnostics: {:?}", e) } Ok(params) => { let not = dispatch::send_notification::(params); sender.send(Task::Notify(not)); } } match publish_decorations(world, uri) { Err(e) => { error!("failed to compute decorations: {:?}", e) } Ok(params) => { let not = dispatch::send_notification::(params); sender.send(Task::Notify(not)) } } }); }