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use std::error::Error;
use std::fmt::{Display, Formatter, Result as FmtResult};
use std::future::Future;
use std::pin::Pin;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::task::{Context, Poll};
use futures::compat::Future01CompatExt;
use futures::future::{self, TryFutureExt};
use futures::sink::SinkExt;
use jsonrpc_core::IoHandler;
use log::info;
use lsp_types::notification::{Exit, Notification};
use tower_service::Service;
use super::delegate::{Delegate, LanguageServerCore, MessageSender, 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(Debug)]
pub struct LspService {
handler: IoHandler,
sender: MessageSender,
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, sender) = Delegate::new(server);
let mut handler = handler.into();
handler.extend_with(delegate.to_delegate());
let stopped = Arc::new(AtomicBool::new(false));
let stopped_arc = stopped.clone();
handler.add_notification(Exit::METHOD, move |_| {
info!("exit notification received, shutting down");
stopped_arc.store(true, Ordering::SeqCst);
});
let service = LspService {
handler,
stopped,
sender,
};
(service, messages)
}
}
impl Service<Incoming> for LspService {
type Response = Option<String>;
type Error = ExitedError;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
fn poll_ready(&mut self, _: &mut Context) -> Poll<Result<(), Self::Error>> {
if self.stopped.load(Ordering::SeqCst) {
Poll::Ready(Err(ExitedError))
} else {
Poll::Ready(Ok(()))
}
}
fn call(&mut self, request: Incoming) -> Self::Future {
if self.stopped.load(Ordering::SeqCst) {
Box::pin(future::err(ExitedError))
} else {
if let Incoming::Response(res) = request {
let mut sender = self.sender.clone();
Box::pin(async move {
sender.send(res).await.unwrap();
Ok(None)
})
} else {
Box::pin(
self.handler
.handle_request(&request.to_string())
.compat()
.map_err(|_| unreachable!()),
)
}
}
}
}
#[cfg(test)]
mod tests {
use async_trait::async_trait;
use jsonrpc_core::Result;
use lsp_types::*;
use tower_test::mock::Spawn;
use super::*;
use crate::Client;
#[derive(Debug, Default)]
struct Mock;
#[async_trait]
impl LanguageServer for Mock {
fn initialize(&self, _: &Client, _: InitializeParams) -> Result<InitializeResult> {
Ok(InitializeResult::default())
}
async fn shutdown(&self) -> Result<()> {
Ok(())
}
}
#[tokio::test]
async fn exit_notification() {
let (service, _) = LspService::new(Mock::default());
let mut service = Spawn::new(service);
let initialized: Incoming = r#"{"jsonrpc":"2.0","method":"initialized"}"#.parse().unwrap();
assert_eq!(service.poll_ready(), Poll::Ready(Ok(())));
assert_eq!(service.call(initialized.clone()).await, Ok(None));
let exit: Incoming = r#"{"jsonrpc":"2.0","method":"exit"}"#.parse().unwrap();
assert_eq!(service.poll_ready(), Poll::Ready(Ok(())));
assert_eq!(service.call(exit).await, Ok(None));
assert_eq!(service.poll_ready(), Poll::Ready(Err(ExitedError)));
assert_eq!(service.call(initialized).await, Err(ExitedError));
}
}