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use std::error::Error;
use std::fmt::{Display, Formatter, Result as FmtResult};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, Mutex};
use futures::future::{self, Future, Shared, SharedError, SharedItem};
use futures::sync::oneshot::{self, Canceled};
use futures::{Async, Poll};
use jsonrpc_core::IoHandler;
use log::{debug, info, trace};
use lsp_types::notification::{Exit, Notification};
use tower_service::Service;
use super::delegate::{Delegate, LanguageServerCore, MessageStream};
use super::message::Incoming;
use super::LanguageServer;
#[derive(Clone, Debug, PartialEq)]
pub struct ExitedError;
impl Display for ExitedError {
fn fmt(&self, fmt: &mut Formatter) -> FmtResult {
write!(fmt, "language server has exited")
}
}
impl Error for ExitedError {}
#[derive(Clone, Debug)]
pub struct ExitReceiver(Shared<oneshot::Receiver<()>>);
impl ExitReceiver {
pub fn run_until_exit<F>(self, future: F) -> impl Future<Item = (), Error = ()> + Send
where
F: Future<Item = (), Error = ()> + Send,
{
self.0
.then(|_| Ok(()))
.select(future)
.map(|item| item.0)
.map_err(|err| err.0)
}
}
impl Future for ExitReceiver {
type Item = SharedItem<()>;
type Error = SharedError<Canceled>;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.0.poll()
}
}
#[derive(Debug)]
pub struct LspService {
handler: IoHandler,
exit_rx: ExitReceiver,
stopped: Arc<AtomicBool>,
}
impl LspService {
pub fn new<T>(server: T) -> (Self, MessageStream)
where
T: LanguageServer,
{
Self::with_handler(server, IoHandler::new())
}
pub fn with_handler<T, U>(server: T, handler: U) -> (Self, MessageStream)
where
T: LanguageServer,
U: Into<IoHandler>,
{
let (delegate, messages) = Delegate::new(server);
let mut handler = handler.into();
handler.extend_with(delegate.to_delegate());
let (tx, rx) = oneshot::channel();
let exit_tx = Mutex::new(Some(tx));
let exit_rx = ExitReceiver(rx.shared());
let stopped = Arc::new(AtomicBool::new(false));
let stopped_arc = stopped.clone();
handler.add_notification(Exit::METHOD, move |_| {
if let Some(tx) = exit_tx.lock().unwrap_or_else(|tx| tx.into_inner()).take() {
info!("exit notification received, shutting down");
stopped_arc.store(true, Ordering::SeqCst);
tx.send(()).unwrap();
}
});
let service = LspService {
handler,
exit_rx,
stopped,
};
(service, messages)
}
pub fn close_handle(&self) -> ExitReceiver {
self.exit_rx.clone()
}
}
impl Service<Incoming> for LspService {
type Response = String;
type Error = ExitedError;
type Future = Box<dyn Future<Item = Self::Response, Error = Self::Error> + Send>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
if self.stopped.load(Ordering::SeqCst) {
Ok(Async::NotReady)
} else {
Ok(Async::Ready(()))
}
}
fn call(&mut self, request: Incoming) -> Self::Future {
if self.stopped.load(Ordering::SeqCst) {
Box::new(future::err(ExitedError))
} else {
if let Incoming::Response(r) = request {
debug!("dropping client response, as per GitHub issue #13: {:?}", r);
Box::new(future::ok(String::new()))
} else {
Box::new(
self.handler
.handle_request(&request.to_string())
.map_err(|_| unreachable!())
.map(move |result| {
result.unwrap_or_else(|| {
trace!("request produced no response: {}", request);
String::new()
})
}),
)
}
}
}
}
#[cfg(test)]
mod tests {
use jsonrpc_core::{BoxFuture, Result};
use lsp_types::*;
use serde_json::Value;
use super::*;
use crate::Printer;
#[derive(Debug, Default)]
struct Mock;
impl LanguageServer for Mock {
type ShutdownFuture = BoxFuture<()>;
type SymbolFuture = BoxFuture<Option<Vec<SymbolInformation>>>;
type ExecuteFuture = BoxFuture<Option<Value>>;
type CompletionFuture = BoxFuture<Option<CompletionResponse>>;
type HighlightFuture = BoxFuture<Option<Vec<DocumentHighlight>>>;
type HoverFuture = BoxFuture<Option<Hover>>;
fn initialize(&self, _: &Printer, _: InitializeParams) -> Result<InitializeResult> {
Ok(InitializeResult::default())
}
fn shutdown(&self) -> Self::ShutdownFuture {
Box::new(future::ok(()))
}
fn symbol(&self, _: WorkspaceSymbolParams) -> Self::SymbolFuture {
Box::new(future::ok(None))
}
fn execute_command(&self, _: &Printer, _: ExecuteCommandParams) -> Self::ExecuteFuture {
Box::new(future::ok(None))
}
fn completion(&self, _: CompletionParams) -> Self::CompletionFuture {
Box::new(future::ok(None))
}
fn hover(&self, _: TextDocumentPositionParams) -> Self::HoverFuture {
Box::new(future::ok(None))
}
fn document_highlight(&self, _: TextDocumentPositionParams) -> Self::HighlightFuture {
Box::new(future::ok(None))
}
}
#[test]
fn exit_notification() {
let (mut service, _) = LspService::new(Mock::default());
let initialized: Incoming = r#"{"jsonrpc":"2.0","method":"initialized"}"#.parse().unwrap();
assert_eq!(service.poll_ready(), Ok(Async::Ready(())));
assert_eq!(service.call(initialized.clone()).wait(), Ok("".to_owned()));
let exit: Incoming = r#"{"jsonrpc":"2.0","method":"exit"}"#.parse().unwrap();
assert_eq!(service.poll_ready(), Ok(Async::Ready(())));
assert_eq!(service.call(exit).wait(), Ok("".to_owned()));
assert_eq!(service.poll_ready(), Ok(Async::NotReady));
assert_eq!(service.call(initialized).wait(), Err(ExitedError));
}
}