mod: mute audience feature

src/lib/buzzer.rs

@@ -1,3 +1,4 @@
+use std::collections::HashSet;
 use std::f32::consts::TAU;
 use std::io::Cursor;
 use std::sync::Arc;
@@ -24,6 +25,9 @@ pub struct BuzzerSession {
 
     pub buzzed_user: Option<UserId>,
     pub is_open: bool,
+    /// Members server-muted by this session. Only these members are unmuted
+    /// when the buzzer is reset, unlocked, or stopped.
+    pub muted_user_ids: HashSet<UserId>,
 }
 
 impl BuzzerSession {
@@ -42,6 +46,7 @@ impl BuzzerSession {
             button_message_id,
             buzzed_user: None,
             is_open: true,
+            muted_user_ids: HashSet::new(),
         }
     }
 }