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|
mod handlers;
mod subscriptions;
use std::path::PathBuf;
use crossbeam_channel::{unbounded, select, Receiver, Sender};
use gen_lsp_server::{
handle_shutdown, ErrorCode, RawMessage, RawNotification, RawRequest, RawResponse,
};
use languageserver_types::NumberOrString;
use ra_analysis::{Canceled, FileId, LibraryData};
use rayon;
use thread_worker::Worker;
use threadpool::ThreadPool;
use rustc_hash::FxHashSet;
use serde::{de::DeserializeOwned, Serialize};
use failure::{format_err, bail};
use failure_derive::Fail;
use crate::{
main_loop::subscriptions::Subscriptions,
project_model::{workspace_loader, CargoWorkspace},
req,
server_world::{ServerWorld, ServerWorldState},
vfs::{self, FileEvent},
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),
}
pub fn main_loop(
internal_mode: bool,
root: PathBuf,
publish_decorations: bool,
msg_receiver: &Receiver<RawMessage>,
msg_sender: &Sender<RawMessage>,
) -> Result<()> {
let pool = ThreadPool::new(8);
let (task_sender, task_receiver) = unbounded::<Task>();
let (fs_worker, fs_watcher) = vfs::roots_loader();
let (ws_worker, ws_watcher) = workspace_loader();
log::info!("server initialized, serving requests");
let mut state = ServerWorldState::default();
let mut pending_requests = FxHashSet::default();
let mut subs = Subscriptions::new();
let main_res = main_loop_inner(
internal_mode,
publish_decorations,
root,
&pool,
msg_sender,
msg_receiver,
task_sender,
task_receiver.clone(),
fs_worker,
ws_worker,
&mut state,
&mut pending_requests,
&mut subs,
);
log::info!("waiting for tasks to finish...");
task_receiver.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 fs_res = fs_watcher.stop();
let ws_res = ws_watcher.stop();
main_res?;
fs_res.map_err(|_| format_err!("fs watcher died"))?;
ws_res.map_err(|_| format_err!("ws watcher died"))?;
Ok(())
}
fn main_loop_inner(
internal_mode: bool,
publish_decorations: bool,
ws_root: PathBuf,
pool: &ThreadPool,
msg_sender: &Sender<RawMessage>,
msg_receiver: &Receiver<RawMessage>,
task_sender: Sender<Task>,
task_receiver: Receiver<Task>,
fs_worker: Worker<PathBuf, (PathBuf, Vec<FileEvent>)>,
ws_worker: Worker<PathBuf, Result<CargoWorkspace>>,
state: &mut ServerWorldState,
pending_requests: &mut FxHashSet<u64>,
subs: &mut Subscriptions,
) -> Result<()> {
let (libdata_sender, libdata_receiver) = unbounded();
ws_worker.send(ws_root.clone());
fs_worker.send(ws_root.clone());
loop {
#[derive(Debug)]
enum Event {
Msg(RawMessage),
Task(Task),
Fs(PathBuf, Vec<FileEvent>),
Ws(Result<CargoWorkspace>),
Lib(LibraryData),
}
log::trace!("selecting");
let event = select! {
recv(msg_receiver, msg) => match msg {
Some(msg) => Event::Msg(msg),
None => bail!("client exited without shutdown"),
},
recv(task_receiver, task) => Event::Task(task.unwrap()),
recv(fs_worker.out, events) => match events {
None => bail!("roots watcher died"),
Some((pb, events)) => Event::Fs(pb, events),
}
recv(ws_worker.out, ws) => match ws {
None => bail!("workspace watcher died"),
Some(ws) => Event::Ws(ws),
}
recv(libdata_receiver, data) => Event::Lib(data.unwrap())
};
let mut state_changed = false;
match event {
Event::Task(task) => on_task(task, msg_sender, pending_requests),
Event::Fs(root, events) => {
log::info!("fs change, {}, {} events", root.display(), events.len());
if root == ws_root {
state.apply_fs_changes(events);
} else {
let (files, resolver) = state.events_to_files(events);
let sender = libdata_sender.clone();
pool.execute(move || {
let start = ::std::time::Instant::now();
log::info!("indexing {} ... ", root.display());
let data = LibraryData::prepare(files, resolver);
log::info!("indexed {:?} {}", start.elapsed(), root.display());
sender.send(data);
});
}
state_changed = true;
}
Event::Ws(ws) => match ws {
Ok(ws) => {
let workspaces = vec![ws];
feedback(internal_mode, "workspace loaded", msg_sender);
for ws in workspaces.iter() {
// Add each library as constant input. If library is
// within the workspace, don't treat it as a library.
//
// HACK: If source roots are nested, pick the outer one.
let mut roots = ws
.packages()
.filter(|pkg| !pkg.is_member(ws))
.filter_map(|pkg| {
let root = pkg.root(ws).to_path_buf();
if root.starts_with(&ws_root) {
None
} else {
Some(root)
}
})
.collect::<Vec<_>>();
roots.sort_by_key(|it| it.as_os_str().len());
let unique = roots
.iter()
.enumerate()
.filter(|&(idx, long)| {
!roots[..idx].iter().any(|short| long.starts_with(short))
})
.map(|(_idx, root)| root);
for root in unique {
log::debug!("sending root, {}", root.display());
fs_worker.send(root.to_owned());
}
}
state.set_workspaces(workspaces);
state_changed = true;
}
Err(e) => log::warn!("loading workspace failed: {}", e),
},
Event::Lib(lib) => {
feedback(internal_mode, "library loaded", msg_sender);
state.add_lib(lib);
}
Event::Msg(msg) => match msg {
RawMessage::Request(req) => {
let req = match handle_shutdown(req, msg_sender) {
Some(req) => req,
None => return Ok(()),
};
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))
}
}
}
RawMessage::Notification(not) => {
on_notification(msg_sender, state, pending_requests, subs, not)?;
state_changed = true;
}
RawMessage::Response(resp) => log::error!("unexpected response: {:?}", resp),
},
};
if state_changed {
update_file_notifications_on_threadpool(
pool,
state.snapshot(),
publish_decorations,
task_sender.clone(),
subs.subscriptions(),
)
}
}
}
fn on_task(task: Task, msg_sender: &Sender<RawMessage>, pending_requests: &mut FxHashSet<u64>) {
match task {
Task::Respond(response) => {
if pending_requests.remove(&response.id) {
msg_sender.send(RawMessage::Response(response))
}
}
Task::Notify(n) => msg_sender.send(RawMessage::Notification(n)),
}
}
fn on_request(
world: &mut ServerWorldState,
pending_requests: &mut FxHashSet<u64>,
pool: &ThreadPool,
sender: &Sender<Task>,
req: RawRequest,
) -> Result<Option<RawRequest>> {
let mut pool_dispatcher = PoolDispatcher {
req: Some(req),
res: None,
pool,
world,
sender,
};
let req = pool_dispatcher
.on::<req::SyntaxTree>(handlers::handle_syntax_tree)?
.on::<req::ExtendSelection>(handlers::handle_extend_selection)?
.on::<req::FindMatchingBrace>(handlers::handle_find_matching_brace)?
.on::<req::JoinLines>(handlers::handle_join_lines)?
.on::<req::OnEnter>(handlers::handle_on_enter)?
.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::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::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)?
.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<RawMessage>,
state: &mut ServerWorldState,
pending_requests: &mut FxHashSet<u64>,
subs: &mut Subscriptions,
not: RawNotification,
) -> Result<()> {
let not = match not.cast::<req::Cancel>() {
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::RequestCancelled as i32,
"canceled by client".to_string(),
);
msg_sender.send(RawMessage::Response(response))
}
return Ok(());
}
Err(not) => not,
};
let not = match not.cast::<req::DidOpenTextDocument>() {
Ok(params) => {
let uri = params.text_document.uri;
let path = uri
.to_file_path()
.map_err(|()| format_err!("invalid uri: {}", uri))?;
let file_id = state.add_mem_file(path, params.text_document.text);
subs.add_sub(file_id);
return Ok(());
}
Err(not) => not,
};
let not = match not.cast::<req::DidChangeTextDocument>() {
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.change_mem_file(path.as_path(), text)?;
return Ok(());
}
Err(not) => not,
};
let not = match not.cast::<req::DidCloseTextDocument>() {
Ok(params) => {
let uri = params.text_document.uri;
let path = uri
.to_file_path()
.map_err(|()| format_err!("invalid uri: {}", uri))?;
let file_id = state.remove_mem_file(path.as_path())?;
subs.remove_sub(file_id);
let params = req::PublishDiagnosticsParams {
uri,
diagnostics: Vec::new(),
};
let not = RawNotification::new::<req::PublishDiagnostics>(¶ms);
msg_sender.send(RawMessage::Notification(not));
return Ok(());
}
Err(not) => not,
};
log::error!("unhandled notification: {:?}", not);
Ok(())
}
struct PoolDispatcher<'a> {
req: Option<RawRequest>,
res: Option<u64>,
pool: &'a ThreadPool,
world: &'a ServerWorldState,
sender: &'a Sender<Task>,
}
impl<'a> PoolDispatcher<'a> {
fn on<'b, R>(
&'b mut self,
f: fn(ServerWorld, R::Params) -> Result<R::Result>,
) -> Result<&'b 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::<R>() {
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::<R>(id, &resp),
Err(e) => match e.downcast::<LspError>() {
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,
e.to_string(),
)
} else {
RawResponse::err(
id,
ErrorCode::InternalError as i32,
format!("{}\n{}", e, e.backtrace()),
)
}
}
},
};
let task = Task::Respond(resp);
sender.send(task);
});
self.res = Some(id);
}
Err(req) => self.req = Some(req),
}
Ok(self)
}
fn finish(&mut self) -> ::std::result::Result<u64, RawRequest> {
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<Task>,
subscriptions: Vec<FileId>,
) {
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::<req::PublishDiagnostics>(¶ms);
sender.send(Task::Notify(not));
}
}
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::<req::PublishDecorations>(¶ms);
sender.send(Task::Notify(not))
}
}
}
}
});
}
fn feedback(intrnal_mode: bool, msg: &str, sender: &Sender<RawMessage>) {
if !intrnal_mode {
return;
}
let not = RawNotification::new::<req::InternalFeedback>(&msg.to_string());
sender.send(RawMessage::Notification(not));
}
fn is_canceled(e: &failure::Error) -> bool {
e.downcast_ref::<Canceled>().is_some()
}
|