Move audio playback to toplevel, out of sse stream generation

src/main.rs

@@ -4,7 +4,7 @@ use std::process;
 use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
-use futures_util::{stream, StreamExt};
+use futures_util::{FutureExt, select, stream, StreamExt};
 #[allow(unused_imports)] use log::{debug, error, info, trace};
 use rppal::gpio::{Gpio, Level, Trigger};
 use smallvec::SmallVec;
@@ -46,8 +46,27 @@ async fn main() {
   pin.set_async_interrupt(Trigger::FallingEdge, move |level| button_pressed(level, &clients))
      .expect("set interrupt");
 
-  let warp = warp(events_clients);
-  warp.await;
+  let (tx, rx) = mpsc::channel(1);
+  events_clients.lock().unwrap().push(tx);
+  let pushes = rx.for_each(|()| {
+    if !audio_busy() {
+      trace!("Playing doorbell chime");
+      match process::Command::new("mplayer")
+                             .arg(OUTDOOR_CHIME_FILE)
+                             .stdout(process::Stdio::null())
+                             .stderr(process::Stdio::null())
+                             .spawn() {
+        Ok(child) => { AUDIO_CHILD.with(|cell| cell.replace(Some(child))); },
+        Err(err) => error!("Error playing outdoor chime: {}", err)
+      };
+    } else { debug!("doorbell still ringing, not playing new chime"); }
+    futures_util::future::ready(())
+  });
+
+  select! {
+    _ = warp(events_clients).fuse() => (),
+    _ = pushes.fuse() => ()
+  }
 }
 
 async fn warp(clients: Arc<Mutex<SmallVec<[mpsc::Sender<()>; CHANNEL_VEC_SIZE]>>>) {
@@ -72,18 +91,6 @@ async fn warp(clients: Arc<Mutex<SmallVec<[mpsc::Sender<()>; CHANNEL_VEC_SIZE]>>
         }),
 
         rx.map(|()| {
-          if !audio_busy() {
-            trace!("Playing doorbell chime");
-            match process::Command::new("mplayer")
-                                   .arg(OUTDOOR_CHIME_FILE)
-                                   .stdout(process::Stdio::null())
-                                   .stderr(process::Stdio::null())
-                                   .spawn() {
-              Ok(child) => { AUDIO_CHILD.with(|cell| cell.replace(Some(child))); },
-              Err(err) => error!("Error playing outdoor chime: {}", err)
-            };
-          } else { debug!("doorbell still ringing, not playing new chime"); }
-
           debug!("sending ring sse");
           Ok::<_, Infallible>((sse::event("ring"), sse::data("")).into_b())
         })