fix: let heatseeking tasks be cancelled

src/heat_seek.rs

@@ -4,6 +4,7 @@ use futures::{StreamExt as _, stream::FuturesUnordered};
 use itertools::Itertools as _;
 use snafu::{ResultExt as _, Snafu};
 use tokio::sync::watch;
+use tokio_util::{sync::CancellationToken, time::FutureExt};
 use twilight_model::id::{
     Id,
     marker::{ChannelMarker, GuildMarker, UserMarker},
@@ -43,16 +44,25 @@ pub async fn heat_seek(state: State) {
                         .bot_data_manager(state.bot_data_manager.clone())
                         .bot_owner_user_id(state.discord_bot_owner_user_id)
                         .bot_user_id(state.discord_user_id)
+                        .cancellation_token(state.cancellation_token.clone())
                         .channel_heat_sender(channel_heat_sender)
                         .vcs_in_guild_watcher(vcs_in_guild_watcher)
                         .call(),
                 );
-                tokio::spawn(map_heat(channel_heat_watcher, heat_map_sender));
+                tokio::spawn(
-                tokio::spawn(track_hottest_vc(
+                    map_heat()
-                    state.discord_bot_owner_user_id,
+                        .cancellation_token(state.cancellation_token.clone())
-                    heat_map_watcher,
+                        .channel_heat_watcher(channel_heat_watcher)
-                    hottest_vc_sender,
+                        .heat_map_sender(heat_map_sender)
-                ));
+                        .call(),
+                );
+                tokio::spawn(
+                    track_hottest_vc()
+                        .cancellation_token(state.cancellation_token.clone())
+                        .heat_map_watcher(heat_map_watcher)
+                        .hottest_vc_sender(hottest_vc_sender)
+                        .call(),
+                );
                 tokio::spawn(follow_hottest_vc(
                     state.clone(),
                     guild_id,
@@ -64,7 +74,13 @@ pub async fn heat_seek(state: State) {
             vcs_in_guild_sender.send_replace(Arc::new(vcs_in_guild.clone()));
         }
 
-        if let Err(_closed) = vcs_watcher.changed().await {
+        if matches!(
+            vcs_watcher
+                .changed()
+                .with_cancellation_token(&state.cancellation_token)
+                .await,
+            None | Some(Err(_))
+        ) {
             break;
         }
     }
@@ -169,6 +185,7 @@ async fn evaluate_heat(
     bot_data_manager: BotDataManager,
     bot_owner_user_id: Id<UserMarker>,
     bot_user_id: Id<UserMarker>,
+    cancellation_token: CancellationToken,
 
     mut vcs_in_guild_watcher: watch::Receiver<Arc<VCsInGuild>>,
     channel_heat_sender: watch::Sender<ChannelHeat>,
@@ -208,15 +225,22 @@ async fn evaluate_heat(
         for get_heat_error in get_heat_errors {
             tracing::error!(?get_heat_error, "failed to evaluate heat of channel")
         }
-
+        if matches!(
-        if let Err(_closed) = vcs_in_guild_watcher.changed().await {
+            vcs_in_guild_watcher
+                .changed()
+                .with_cancellation_token(&cancellation_token)
+                .await,
+            None | Some(Err(_))
+        ) {
             break;
         }
     }
 }
 
+#[bon::builder]
 #[tracing::instrument(skip(channel_heat_watcher, heat_map_sender))]
 async fn map_heat(
+    cancellation_token: CancellationToken,
     mut channel_heat_watcher: watch::Receiver<ChannelHeat>,
     heat_map_sender: watch::Sender<HeatMap>,
 ) {
@@ -234,15 +258,23 @@ async fn map_heat(
             changed
         });
 
-        if let Err(_closed) = channel_heat_watcher.changed().await {
+        if matches!(
+            channel_heat_watcher
+                .changed()
+                .with_cancellation_token(&cancellation_token)
+                .await,
+            None | Some(Err(_))
+        ) {
             break;
         }
     }
 }
 
+#[bon::builder]
 #[tracing::instrument(skip(heat_map_watcher, hottest_vc_sender))]
 async fn track_hottest_vc(
-    bot_owner_id: Id<UserMarker>,
+    cancellation_token: CancellationToken,
+
     mut heat_map_watcher: watch::Receiver<HeatMap>,
     hottest_vc_sender: watch::Sender<Option<Id<ChannelMarker>>>,
 ) {
@@ -264,7 +296,13 @@ async fn track_hottest_vc(
             modified
         });
 
-        if let Err(_closed) = heat_map_watcher.changed().await {
+        if matches!(
+            heat_map_watcher
+                .changed()
+                .with_cancellation_token(&cancellation_token)
+                .await,
+            None | Some(Err(_))
+        ) {
             break;
         }
     }
@@ -347,7 +385,13 @@ async fn follow_hottest_vc(
             }
         }
 
-        if let Err(_closed) = hottest_vc_watcher.changed().await {
+        if matches!(
+            hottest_vc_watcher
+                .changed()
+                .with_cancellation_token(&state.cancellation_token)
+                .await,
+            None | Some(Err(_))
+        ) {
             break;
         }
     }