feat: expose connection count

Author: lherman-cs

src/manager.rs

@@ -82,6 +82,14 @@ impl Manager {
             tracing::warn!("unexpected event_ch ended prematurely on remove: {:?}", err);
         }
     }
+
+    pub fn is_empty(&self) -> bool {
+        self.conns.is_empty()
+    }
+
+    pub fn len(&self) -> usize {
+        self.conns.len()
+    }
 }
 
 #[derive(Debug, Clone)]

src/server.rs

@@ -19,7 +19,7 @@ const KEEP_ALIVE_INTERVAL: Duration = Duration::from_secs(45);
 
 #[derive(Clone)]
 pub struct Server {
-    manager: Manager,
+    pub manager: Manager,
 }
 
 pub type MessageStream = Pin<Box<dyn Stream<Item = proto::Message> + Send>>;