Stop publication cache task on disconnected channels

Author: fuzzypixelz

zenoh-ext/src/publication_cache.rs

@@ -260,34 +260,53 @@ impl PublicationCache {
                     tokio::select! {
                         // on publication received by the local subscriber, store it
                         sample = sub_recv.recv_async() => {
-                            if let Ok(sample) = sample {
-                                let queryable_key_expr: KeyExpr<'_> = if let Some(prefix) = &queryable_prefix {
-                                    prefix.join(&sample.key_expr()).unwrap().into()
-                                } else {
-                                    sample.key_expr().clone()
-                                };
-
-                                if let Some(queue) = cache.get_mut(queryable_key_expr.as_keyexpr()) {
-                                    if queue.len() >= history {
-                                        queue.pop_front();
-                                    }
-                                    queue.push_back(sample);
-                                } else if cache.len() >= limit {
-                                    tracing::error!("PublicationCache on {}: resource_limit exceeded - can't cache publication for a new resource",
-                                    pub_key_expr);
-                                } else {
-                                    let mut queue: VecDeque<Sample> = VecDeque::new();
-                                    queue.push_back(sample);
-                                    cache.insert(queryable_key_expr.into(), queue);
+                            let Ok(sample) = sample else {
+                                return;
+                            };
+
+                            let queryable_key_expr: KeyExpr<'_> = if let Some(prefix) = &queryable_prefix {
+                                prefix.join(&sample.key_expr()).unwrap().into()
+                            } else {
+                                sample.key_expr().clone()
+                            };
+
+                            if let Some(queue) = cache.get_mut(queryable_key_expr.as_keyexpr()) {
+                                if queue.len() >= history {
+                                    queue.pop_front();
                                 }
+                                queue.push_back(sample);
+                            } else if cache.len() >= limit {
+                                tracing::error!("PublicationCache on {}: resource_limit exceeded - can't cache publication for a new resource",
+                                pub_key_expr);
+                            } else {
+                                let mut queue: VecDeque<Sample> = VecDeque::new();
+                                queue.push_back(sample);
+                                cache.insert(queryable_key_expr.into(), queue);
                             }
                         },
 
                         // on query, reply with cached content
                         query = quer_recv.recv_async() => {
-                            if let Ok(query) = query {
-                                if !query.key_expr().as_str().contains('*') {
-                                    if let Some(queue) = cache.get(query.key_expr().as_keyexpr()) {
+                            let Ok(query) = query else { 
+                                return 
+                            };
+
+                            if !query.key_expr().as_str().contains('*') {
+                                if let Some(queue) = cache.get(query.key_expr().as_keyexpr()) {
+                                    for sample in queue {
+                                        if let (Some(Ok(time_range)), Some(timestamp)) = (query.parameters().time_range(), sample.timestamp()) {
+                                            if !time_range.contains(timestamp.get_time().to_system_time()){
+                                                continue;
+                                            }
+                                        }
+                                        if let Err(e) = query.reply_sample(sample.clone()).await {
+                                            tracing::warn!("Error replying to query: {}", e);
+                                        }
+                                    }
+                                }
+                            } else {
+                                for (key_expr, queue) in cache.iter() {
+                                    if query.key_expr().intersects(unsafe{ keyexpr::from_str_unchecked(key_expr) }) {
                                         for sample in queue {
                                             if let (Some(Ok(time_range)), Some(timestamp)) = (query.parameters().time_range(), sample.timestamp()) {
                                                 if !time_range.contains(timestamp.get_time().to_system_time()){
@@ -299,21 +318,6 @@ impl PublicationCache {
                                             }
                                         }
                                     }
-                                } else {
-                                    for (key_expr, queue) in cache.iter() {
-                                        if query.key_expr().intersects(unsafe{ keyexpr::from_str_unchecked(key_expr) }) {
-                                            for sample in queue {
-                                                if let (Some(Ok(time_range)), Some(timestamp)) = (query.parameters().time_range(), sample.timestamp()) {
-                                                    if !time_range.contains(timestamp.get_time().to_system_time()){
-                                                        continue;
-                                                    }
-                                                }
-                                                if let Err(e) = query.reply_sample(sample.clone()).await {
-                                                    tracing::warn!("Error replying to query: {}", e);
-                                                }
-                                            }
-                                        }
-                                    }
                                 }
                             }
                         },