internal: vendor lsp-server

lib/lsp-server/src/req_queue.rs

@@ -0,0 +1,62 @@
+use std::collections::HashMap;
+
+use serde::Serialize;
+
+use crate::{ErrorCode, Request, RequestId, Response, ResponseError};
+
+/// Manages the set of pending requests, both incoming and outgoing.
+#[derive(Debug)]
+pub struct ReqQueue<I, O> {
+    pub incoming: Incoming<I>,
+    pub outgoing: Outgoing<O>,
+}
+
+impl<I, O> Default for ReqQueue<I, O> {
+    fn default() -> ReqQueue<I, O> {
+        ReqQueue {
+            incoming: Incoming { pending: HashMap::default() },
+            outgoing: Outgoing { next_id: 0, pending: HashMap::default() },
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Incoming<I> {
+    pending: HashMap<RequestId, I>,
+}
+
+#[derive(Debug)]
+pub struct Outgoing<O> {
+    next_id: i32,
+    pending: HashMap<RequestId, O>,
+}
+
+impl<I> Incoming<I> {
+    pub fn register(&mut self, id: RequestId, data: I) {
+        self.pending.insert(id, data);
+    }
+    pub fn cancel(&mut self, id: RequestId) -> Option<Response> {
+        let _data = self.complete(id.clone())?;
+        let error = ResponseError {
+            code: ErrorCode::RequestCanceled as i32,
+            message: "canceled by client".to_string(),
+            data: None,
+        };
+        Some(Response { id, result: None, error: Some(error) })
+    }
+    pub fn complete(&mut self, id: RequestId) -> Option<I> {
+        self.pending.remove(&id)
+    }
+}
+
+impl<O> Outgoing<O> {
+    pub fn register<P: Serialize>(&mut self, method: String, params: P, data: O) -> Request {
+        let id = RequestId::from(self.next_id);
+        self.pending.insert(id.clone(), data);
+        self.next_id += 1;
+        Request::new(id, method, params)
+    }
+    pub fn complete(&mut self, id: RequestId) -> Option<O> {
+        self.pending.remove(&id)
+    }
+}