Adding response FIFO.

Cargo.lock

@@ -1401,6 +1401,18 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "nix"
+version = "0.30.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74523f3a35e05aba87a1d978330aef40f67b0304ac79c1c00b294c9830543db6"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "cfg_aliases",
+ "libc",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -1973,6 +1985,7 @@ dependencies = [
  "genai",
  "human-panic",
  "irc",
+ "nix",
  "rstest",
  "serde",
  "serde_json",

Cargo.toml

@@ -15,6 +15,10 @@ serde_json = "1.0"
 tracing = "0.1"
 tracing-subscriber = "0.3"
 
+  [dependencies.nix]
+  version = "0.30.1"
+  features = [ "fs" ]
+
   [dependencies.clap]
   version = "4.5"
   features = [ "derive" ]

src/event_manager.rs

@@ -1,10 +1,13 @@
 use std::{collections::VecDeque, path::Path, sync::Arc};
 
 use color_eyre::Result;
+use nix::{NixPath, sys::stat, unistd::mkfifo};
 use tokio::{
-    io::AsyncWriteExt,
-    net::{UnixListener, UnixStream},
-    sync::{RwLock, broadcast},
+    io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
+    net::{
+        unix::pipe, UnixListener, UnixStream
+    },
+    sync::{broadcast, RwLock},
 };
 use tracing::{error, info};
 
@@ -46,8 +49,30 @@ impl EventManager {
         Ok(())
     }
 
-    pub async fn start_listening(self: Arc<Self>, path: impl AsRef<Path>) {
-        let listener = UnixListener::bind(path).unwrap();
+    // NB: This assumes it has exclusive control of the FIFO.
+    pub async fn start_fifo<P>(path: &P) -> Result<()>
+    where
+        P: AsRef<Path> + NixPath + ?Sized,
+    {
+        // Overwrite, or create the FIFO.
+        let _ = std::fs::remove_file(path);
+        mkfifo(path, stat::Mode::S_IRWXU)?;
+
+        loop {
+            let rx = pipe::OpenOptions::new().open_receiver(path)?;
+            
+            let mut reader = BufReader::new(rx);
+            let mut line = String::new();
+
+            while reader.read_line(&mut line).await? > 0 {
+                // Now handle the command.
+                line.clear();
+            }
+        }
+    }
+
+    pub async fn start_listening(self: Arc<Self>, broadcast_path: impl AsRef<Path>) {
+        let listener = UnixListener::bind(broadcast_path).unwrap();
 
         loop {
             match listener.accept().await {