Work on manager connection system

unshell-lib/src/module/manager_connection.rs

@@ -0,0 +1,29 @@
+use crate::{
+    Announcement,
+    module::Manager,
+    network::{Connection, Stream},
+};
+
+impl Manager {
+    pub fn add_connection(&mut self, connection: Connection) {
+        self.connections.push(connection);
+    }
+
+    pub fn prune_connections(&mut self) {
+        self.connections.retain(|c| c.is_alive());
+    }
+
+    pub fn recv_connection_announcements(&mut self) {
+        // Collect all incoming announcements
+        let announcements = self
+            .connections
+            .iter()
+            .map(|c| c.read())
+            .flat_map(|array| array)
+            .collect::<Vec<Announcement>>();
+
+        for announcement in announcements {
+            self.recv_announcement(&announcement)
+        }
+    }
+}