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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use super::state::ServerState;
use super::state::ServerStateSnapshot;
use super::state::Task;
use super::utils::from_json;
use super::utils::is_canceled;
use deno_core::error::custom_error;
use deno_core::error::AnyError;
use lsp_server::ErrorCode;
use lsp_server::Notification;
use lsp_server::Request;
use lsp_server::RequestId;
use lsp_server::Response;
use serde::de::DeserializeOwned;
use serde::Serialize;
use std::fmt;
use std::panic;
pub struct NotificationDispatcher<'a> {
pub notification: Option<Notification>,
pub server_state: &'a mut ServerState,
}
impl<'a> NotificationDispatcher<'a> {
pub fn on<N>(
&mut self,
f: fn(&mut ServerState, N::Params) -> Result<(), AnyError>,
) -> Result<&mut Self, AnyError>
where
N: lsp_types::notification::Notification + 'static,
N::Params: DeserializeOwned + Send + 'static,
{
let notification = match self.notification.take() {
Some(it) => it,
None => return Ok(self),
};
let params = match notification.extract::<N::Params>(N::METHOD) {
Ok(it) => it,
Err(notification) => {
self.notification = Some(notification);
return Ok(self);
}
};
f(self.server_state, params)?;
Ok(self)
}
pub fn finish(&mut self) {
if let Some(notification) = &self.notification {
if !notification.method.starts_with("$/") {
error!("unhandled notification: {:?}", notification);
}
}
}
}
fn result_to_response<R>(
id: RequestId,
result: Result<R::Result, AnyError>,
) -> Response
where
R: lsp_types::request::Request + 'static,
R::Params: DeserializeOwned + 'static,
R::Result: Serialize + 'static,
{
match result {
Ok(response) => Response::new_ok(id, &response),
Err(err) => {
if is_canceled(&*err) {
Response::new_err(
id,
ErrorCode::ContentModified as i32,
"content modified".to_string(),
)
} else {
Response::new_err(id, ErrorCode::InternalError as i32, err.to_string())
}
}
}
}
pub struct RequestDispatcher<'a> {
pub request: Option<Request>,
pub server_state: &'a mut ServerState,
}
impl<'a> RequestDispatcher<'a> {
pub fn finish(&mut self) {
if let Some(request) = self.request.take() {
error!("unknown request: {:?}", request);
let response = Response::new_err(
request.id,
ErrorCode::MethodNotFound as i32,
"unknown request".to_string(),
);
self.server_state.respond(response);
}
}
/// Handle a request which will respond to the LSP client asynchronously via
/// a spawned thread.
pub fn on<R>(
&mut self,
f: fn(ServerStateSnapshot, R::Params) -> Result<R::Result, AnyError>,
) -> &mut Self
where
R: lsp_types::request::Request + 'static,
R::Params: DeserializeOwned + Send + fmt::Debug + 'static,
R::Result: Serialize + 'static,
{
let (id, params) = match self.parse::<R>() {
Some(it) => it,
None => return self,
};
self.server_state.spawn({
let state = self.server_state.snapshot();
move || {
let result = f(state, params);
Task::Response(result_to_response::<R>(id, result))
}
});
self
}
/// Handle a request which will respond synchronously, returning a result if
/// the request cannot be handled or has issues.
pub fn on_sync<R>(
&mut self,
f: fn(&mut ServerState, R::Params) -> Result<R::Result, AnyError>,
) -> Result<&mut Self, AnyError>
where
R: lsp_types::request::Request + 'static,
R::Params: DeserializeOwned + panic::UnwindSafe + fmt::Debug + 'static,
R::Result: Serialize + 'static,
{
let (id, params) = match self.parse::<R>() {
Some(it) => it,
None => return Ok(self),
};
let state = panic::AssertUnwindSafe(&mut *self.server_state);
let response = panic::catch_unwind(move || {
let result = f(state.0, params);
result_to_response::<R>(id, result)
})
.map_err(|_err| {
custom_error(
"SyncTaskPanic",
format!("sync task {:?} panicked", R::METHOD),
)
})?;
self.server_state.respond(response);
Ok(self)
}
fn parse<R>(&mut self) -> Option<(RequestId, R::Params)>
where
R: lsp_types::request::Request + 'static,
R::Params: DeserializeOwned + 'static,
{
let request = match &self.request {
Some(request) if request.method == R::METHOD => {
self.request.take().unwrap()
}
_ => return None,
};
let response = from_json(R::METHOD, request.params);
match response {
Ok(params) => Some((request.id, params)),
Err(err) => {
let response = Response::new_err(
request.id,
ErrorCode::InvalidParams as i32,
err.to_string(),
);
self.server_state.respond(response);
None
}
}
}
}
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