From a938f5a87a2b67dd8667337cd569cc6627d0f666 Mon Sep 17 00:00:00 2001
From: Dmitry Sharshakov
Date: Sat, 21 Aug 2021 17:21:35 +0300
Subject: refactor: handle DAP events in editor main loop

---
 helix-dap/src/client.rs | 74 ++++++++++++++++---------------------------------
 1 file changed, 24 insertions(+), 50 deletions(-)

(limited to 'helix-dap/src')

diff --git a/helix-dap/src/client.rs b/helix-dap/src/client.rs
index f2d5b865..bc7a93d8 100644
--- a/helix-dap/src/client.rs
+++ b/helix-dap/src/client.rs
@@ -1,5 +1,5 @@
 use crate::{
-    transport::{Event, Payload, Request, Transport},
+    transport::{Payload, Request, Transport},
     types::*,
     Result,
 };
@@ -9,19 +9,13 @@ use std::{
     net::{IpAddr, Ipv4Addr, SocketAddr},
     path::PathBuf,
     process::Stdio,
-    sync::{
-        atomic::{AtomicU64, Ordering},
-        Arc,
-    },
+    sync::atomic::{AtomicU64, Ordering},
 };
 use tokio::{
     io::{AsyncBufRead, AsyncWrite, BufReader, BufWriter},
     net::TcpStream,
     process::{Child, Command},
-    sync::{
-        mpsc::{channel, Receiver, Sender, UnboundedReceiver, UnboundedSender},
-        Mutex,
-    },
+    sync::mpsc::{channel, unbounded_channel, UnboundedReceiver, UnboundedSender},
     time,
 };
 
@@ -32,8 +26,6 @@ pub struct Client {
     server_tx: UnboundedSender<Request>,
     request_counter: AtomicU64,
     capabilities: Option<DebuggerCapabilities>,
-    awaited_events: Arc<Mutex<HashMap<String, Sender<Event>>>>,
-
     //
     pub breakpoints: HashMap<PathBuf, Vec<SourceBreakpoint>>,
     // TODO: multiple threads support
@@ -46,8 +38,9 @@ impl Client {
         tx: Box<dyn AsyncWrite + Unpin + Send>,
         id: usize,
         process: Option<Child>,
-    ) -> Result<Self> {
+    ) -> Result<(Self, UnboundedReceiver<Payload>)> {
         let (server_rx, server_tx) = Transport::start(rx, tx, id);
+        let (client_rx, client_tx) = unbounded_channel();
 
         let client = Self {
             id,
@@ -55,24 +48,30 @@ impl Client {
             server_tx,
             request_counter: AtomicU64::new(0),
             capabilities: None,
-            awaited_events: Arc::new(Mutex::new(HashMap::default())),
             //
             breakpoints: HashMap::new(),
             stack_pointer: None,
         };
 
-        tokio::spawn(Self::recv(Arc::clone(&client.awaited_events), server_rx));
+        tokio::spawn(Self::recv(server_rx, client_rx));
 
-        Ok(client)
+        Ok((client, client_tx))
     }
 
-    pub async fn tcp(addr: std::net::SocketAddr, id: usize) -> Result<Self> {
+    pub async fn tcp(
+        addr: std::net::SocketAddr,
+        id: usize,
+    ) -> Result<(Self, UnboundedReceiver<Payload>)> {
         let stream = TcpStream::connect(addr).await?;
         let (rx, tx) = stream.into_split();
         Self::streams(Box::new(BufReader::new(rx)), Box::new(tx), id, None)
     }
 
-    pub fn stdio(cmd: &str, args: Vec<&str>, id: usize) -> Result<Self> {
+    pub fn stdio(
+        cmd: &str,
+        args: Vec<&str>,
+        id: usize,
+    ) -> Result<(Self, UnboundedReceiver<Payload>)> {
         let process = Command::new(cmd)
             .args(args)
             .stdin(Stdio::piped())
@@ -114,7 +113,7 @@ impl Client {
         args: Vec<&str>,
         port_format: &str,
         id: usize,
-    ) -> Result<Self> {
+    ) -> Result<(Self, UnboundedReceiver<Payload>)> {
         let port = Self::get_port().await.unwrap();
 
         let process = Command::new(cmd)
@@ -145,43 +144,22 @@ impl Client {
         )
     }
 
-    async fn recv(
-        awaited_events: Arc<Mutex<HashMap<String, Sender<Event>>>>,
-        mut server_rx: UnboundedReceiver<Payload>,
-    ) {
+    async fn recv(mut server_rx: UnboundedReceiver<Payload>, client_tx: UnboundedSender<Payload>) {
         while let Some(msg) = server_rx.recv().await {
             match msg {
                 Payload::Event(ev) => {
-                    let name = ev.event.clone();
-                    let hashmap = awaited_events.lock().await;
-                    let tx = hashmap.get(&name);
-
-                    match tx {
-                        Some(tx) => match tx.send(ev).await {
-                            Ok(_) => (),
-                            Err(_) => error!(
-                                "Tried sending event into a closed channel (name={:?})",
-                                name
-                            ),
-                        },
-                        None => {
-                            info!("unhandled event {}", name);
-                            // client_tx.send(Payload::Event(ev)).expect("Failed to send");
-                        }
-                    }
+                    client_tx.send(Payload::Event(ev)).expect("Failed to send");
                 }
                 Payload::Response(_) => unreachable!(),
-                Payload::Request(_) => todo!(),
+                Payload::Request(req) => {
+                    client_tx
+                        .send(Payload::Request(req))
+                        .expect("Failed to send");
+                }
             }
         }
     }
 
-    pub async fn listen_for_event(&self, name: String) -> Receiver<Event> {
-        let (rx, tx) = channel(1);
-        self.awaited_events.lock().await.insert(name.clone(), rx);
-        tx
-    }
-
     pub fn id(&self) -> usize {
         self.id
     }
@@ -248,8 +226,6 @@ impl Client {
     }
 
     pub async fn launch(&mut self, args: serde_json::Value) -> Result<()> {
-        // TODO: buffer these until initialized arrives
-
         let response = self.request::<requests::Launch>(args).await?;
         log::error!("launch response {}", response);
 
@@ -257,8 +233,6 @@ impl Client {
     }
 
     pub async fn attach(&mut self, args: serde_json::Value) -> Result<()> {
-        // TODO: buffer these until initialized arrives
-
         let response = self.request::<requests::Attach>(args).await?;
         log::error!("attach response {}", response);
 
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