first pass at xpc impl

kordophoned/src/xpc/agent.rs

@@ -0,0 +1,38 @@
+use crate::daemon::{events::Event, signals::Signal, DaemonResult};
+use std::sync::Arc;
+use tokio::sync::{mpsc, oneshot, Mutex};
+
+/// XPC IPC agent that forwards daemon events and signals over libxpc.
+#[derive(Clone)]
+pub struct XpcAgent {
+    event_sink: mpsc::Sender<Event>,
+    signal_receiver: Arc<Mutex<Option<mpsc::Receiver<Signal>>>>,
+}
+
+impl XpcAgent {
+    /// Create a new XPC agent with an event sink and signal receiver.
+    pub fn new(event_sink: mpsc::Sender<Event>, signal_receiver: mpsc::Receiver<Signal>) -> Self {
+        Self {
+            event_sink,
+            signal_receiver: Arc::new(Mutex::new(Some(signal_receiver))),
+        }
+    }
+
+    /// Run the XPC agent: perform a basic GetVersion IPC call to the daemon and print the result.
+    pub async fn run(self) {
+        todo!()
+    }
+
+    /// Send an event to the daemon and await its reply.
+    pub async fn send_event<T>(
+        &self,
+        make_event: impl FnOnce(crate::daemon::events::Reply<T>) -> Event,
+    ) -> DaemonResult<T> {
+        let (tx, rx) = oneshot::channel();
+        self.event_sink
+            .send(make_event(tx))
+            .await
+            .map_err(|_| "Failed to send event")?;
+        rx.await.map_err(|_| "Failed to receive reply".into())
+    }
+}