From 59d6b92e5b05a829dd2aeb0994afc51dec0da87f Mon Sep 17 00:00:00 2001
From: Dmitry Sharshakov
Date: Fri, 13 Aug 2021 22:46:40 +0300
Subject: refactor response processing

---
 helix-dap/src/transport.rs | 78 ++++++++++++++++++++++------------------------
 1 file changed, 37 insertions(+), 41 deletions(-)

diff --git a/helix-dap/src/transport.rs b/helix-dap/src/transport.rs
index 5f16df5f..37aa9e25 100644
--- a/helix-dap/src/transport.rs
+++ b/helix-dap/src/transport.rs
@@ -1,6 +1,6 @@
 use crate::{Error, Result};
 use anyhow::Context;
-use log::{error, info};
+use log::{error, info, warn};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use std::collections::HashMap;
@@ -162,54 +162,50 @@ impl Transport {
         Ok(())
     }
 
+    fn process_response(res: Response) -> Result<Response> {
+        match res.success {
+            true => {
+                info!(
+                    "<- DAP success ({}, in response to {})",
+                    res.seq, res.request_seq
+                );
+
+                Ok(res)
+            }
+            false => {
+                error!(
+                    "<- DAP error {:?} ({:?}) for command #{} {}",
+                    res.message, res.body, res.request_seq, res.command
+                );
+
+                Err(Error::Other(anyhow::format_err!("{:?}", res.body)))
+            }
+        }
+    }
+
     async fn process_server_message(
         &self,
         client_tx: &UnboundedSender<Payload>,
         msg: Payload,
     ) -> Result<()> {
         match msg {
-            Payload::Response(Response {
-                ref success,
-                ref seq,
-                request_seq,
-                ref command,
-                ref message,
-                ref body,
-                ..
-            }) => {
-                let result = match success {
-                    true => {
-                        info!("<- DAP success ({}, in response to {})", seq, request_seq);
-                        if let Payload::Response(val) = msg {
-                            Ok(val)
-                        } else {
-                            unreachable!();
-                        }
+            Payload::Response(res) => {
+                let request_seq = res.request_seq;
+                let tx = self.pending_requests.lock().await.remove(&request_seq);
+
+                match tx {
+                    Some(tx) => match tx.send(Self::process_response(res)).await {
+                        Ok(_) => (),
+                        Err(_) => error!(
+                            "Tried sending response into a closed channel (id={:?}), original request likely timed out",
+                            request_seq
+                        ),
                     }
-                    false => {
-                        error!(
-                            "<- DAP error {:?} ({:?}) for command #{} {}",
-                            message, body, request_seq, command
-                        );
-
-                        Err(Error::Other(anyhow::format_err!("{:?}", body)))
+                    None => {
+                        warn!("Response to nonexistent request #{}", res.request_seq);
+                        client_tx.send(Payload::Response(res)).expect("Failed to send");
                     }
-                };
-
-                let tx = self
-                    .pending_requests
-                    .lock()
-                    .await
-                    .remove(&request_seq)
-                    .expect("pending_request with id not found!");
-
-                match tx.send(result).await {
-                    Ok(_) => (),
-                    Err(_) => error!(
-                        "Tried sending response into a closed channel (id={:?}), original request likely timed out",
-                        request_seq
-                    ),
-                };
+                }
 
                 Ok(())
             }
-- 
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