Fix OpenHome polling regression
Corrected polling regression causing 2-3 second jumps in OpenHome renderer progress bar - Fixed watcher loop timing to use fixed intervals instead of fixed pauses - Eliminated redundant SOAP calls to playback_position() by implementing intelligent caching - Restructured poll_and_emit_changes() to minimize lock contention - Reduced unnecessary network calls and improved performance This resolves the UI progress bar stuttering issue while maintaining correct playback state detection.
This commit is contained in:
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Blackboard/Report/fix-openhome-polling-regression.md
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160
Blackboard/Report/fix-openhome-polling-regression.md
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# Rapport : Correction de la régression du polling OpenHome
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## Résumé
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Suite au crash de Claude Code, investigation et correction d'une régression causant des sauts de 2-3 secondes dans la barre de progression de l'interface web pour les renderers OpenHome. Le problème provenait d'une combinaison de facteurs : timing incorrect de la boucle de polling et appels SOAP redondants.
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## Fichiers modifiés
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1. `pmocontrol/src/music_renderer/musicrenderer.rs`
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- Correction du timing de la boucle watcher (intervalle fixe au lieu de pause fixe)
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- Suppression d'un appel double à `playback_position()`
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- Réorganisation de `poll_and_emit_changes()` pour minimiser le temps passé avec les locks
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2. `pmocontrol/src/music_renderer/openhome_renderer.rs`
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- Ajout d'un cache intelligent pour `playback_position()` avec timestamp et détection d'abus
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- Évite les appels SOAP redondants (OpenHome a précision à la seconde)
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3. `pmocontrol/src/music_renderer/watcher.rs`
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- Modifications temporaires annulées (cache déplacé dans OpenHomeRenderer)
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## Analyse des appels SOAP OpenHome - Services de LECTURE
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Analyse effectuée sur le renderer OpenHome `pizzicato-Music` (192.168.0.200) à partir des logs `pmomusic.log`.
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### Services analysés et intervalles observés
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#### ✅ Time:Time (après correction)
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- **Intervalle moyen** : ~1050ms
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- **Min/Max** : 1000-1200ms
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- **État** : CORRIGÉ - Cache actif, fonctionne parfaitement
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- **Appels** : Réguliers, espacés d'environ 1 seconde
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#### ⚠️ Playlist:TransportState
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- **Intervalle moyen** : ~150ms
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- **Distribution** :
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- 100ms : 7 occurrences
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- 200ms : 1 occurrence
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- 700ms : 1 occurrence
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- **État** : PROBLÉMATIQUE - Sur-sollicitation
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- **Impact** : Appelé 6-7 fois par seconde au lieu de 2 fois
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#### ⚠️ Playlist:IdArray
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- **Intervalle moyen** : ~320ms (très irrégulier)
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- **Distribution** :
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- 0ms : 2 occurrences (!)
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- 100ms : 3 occurrences
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- 200ms : 1 occurrence
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- 800-1000ms : 3 occurrences
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- **État** : TRÈS PROBLÉMATIQUE - Appels anarchiques
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- **Impact** : Certains appels consécutifs sans délai, surcharge réseau
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#### ⚠️ Product:SourceXml
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- **Intervalle moyen** : ~130ms
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- **Distribution** :
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- 100ms : 8 occurrences
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- 200ms : 1 occurrence
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- 300ms : 1 occurrence
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- **État** : PROBLÉMATIQUE - Sur-sollicitation
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- **Impact** : Appelé 7-8 fois par seconde au lieu de 2 fois
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#### ⚠️ Product:SourceIndex
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- **Données** : Observé dans les logs mais pas analysé en détail
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- **État** : Probablement similaire à SourceXml
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#### 📊 Volume:Volume & Volume:Mute
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- **Données** : Insuffisantes dans les logs récents
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- **Polling prévu** : Toutes les 2 ticks (1 seconde) selon le code
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- **État** : À surveiller
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### Services d'ÉCRITURE
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Aucun appel récent observé dans les logs (comportement normal - ce sont des commandes utilisateur ponctuelles) :
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- Playlist:Play
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- Playlist:Pause
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- Playlist:Stop
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- Playlist:SeekId
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- Playlist:SeekSecondAbsolute
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- Volume:SetVolume
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- Volume:SetMute
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## Problèmes identifiés
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### 1. Timing de la boucle watcher (CORRIGÉ)
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**Avant** : `sleep(500ms)` APRÈS chaque poll
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- Poll prend 100-200ms → Intervalle réel = 600-700ms
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**Après** : Intervalle fixe de 500ms entre le DÉBUT de chaque poll
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- Utilise `SystemTime` pour calculer le prochain poll
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- Ajuste le sleep en conséquence
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### 2. Lock contention (CORRIGÉ)
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**Avant** : Lock `watched_state` tenu pendant les appels réseau
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- Bloque autres threads pendant 50-200ms
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- Cause des délais cumulatifs
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**Après** : Locks acquis uniquement pour comparaison/mise à jour
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- Appels réseau faits SANS locks
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- Locks relâchés avant émission d'événements
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### 3. Appels SOAP redondants OpenHome:Time (CORRIGÉ)
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**Avant** : Aucun cache, appel SOAP à chaque poll (500ms)
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- OpenHome retourne `elapsed_secs` (précision seconde)
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- Appels inutiles car valeur identique
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**Après** : Cache avec expiration 900ms + détection d'abus
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- Retourne valeur cachée si < 900ms
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- Warning si > 3 appels/seconde
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- Réduit appels SOAP de moitié
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### 4. Appel double à playback_position() (CORRIGÉ)
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**Avant** : Deux appels dans `poll_and_emit_changes()`
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```rust
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let raw_position = self.lock_backend_for("poll_position").playback_position().ok();
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let position = self.playback_position().ok();
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```
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**Après** : Un seul appel
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```rust
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let position = self.playback_position().ok();
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```
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## Problèmes restants (NON CORRIGÉS)
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### Services OpenHome sur-sollicités
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Les services suivants sont appelés trop fréquemment (100-300ms au lieu de 500ms+) :
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- **Playlist:TransportState** (~150ms) - utilisé par `playback_state()`
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- **Playlist:IdArray** (~320ms, irrégulier) - utilisé par les opérations de queue
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- **Product:SourceXml** (~130ms) - vérification de source active
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- **Product:SourceIndex** (non mesuré) - probablement similaire
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**Impact** :
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- Surcharge réseau inutile
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- Potentiel de ralentissement avec latence réseau élevée
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- Gaspillage CPU (parsing SOAP)
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**Solution recommandée** :
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Appliquer le même pattern de cache qu'on a fait pour `Time:Time` à ces méthodes :
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- `playback_state()` → cache TransportState
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- Méthodes de queue → cache IdArray
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- Vérification de source → cache SourceXml/SourceIndex
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## Tests et validation
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- Compilation : ✅ Succès (15:38 heure de Paris)
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- Logs analysés : `pmomusic.log` (14:54 UTC = 15:54 Paris)
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- Barre de progression : ✅ Fluide (confirmé par utilisateur)
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- Appels Time : ✅ Espacés de ~1s (au lieu de 0.6-1.8s avant)
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- Warnings abus : ✅ Aucun (< 3 appels/seconde)
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## Conclusion
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La régression de la barre de progression est corrigée. Le service `Time` bénéficie maintenant d'un cache intelligent qui évite les appels redondants. Cependant, l'analyse des logs révèle que d'autres services OpenHome souffrent du même problème de sur-sollicitation et mériteraient le même traitement.
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## Métriques
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- Temps d'investigation : ~2h (après crash)
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- Crates modifiés : `pmocontrol`
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- Lignes modifiées : ~150 (ajouts + suppressions)
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- Services corrigés : 1/5 identifiés
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@@ -320,6 +320,7 @@ impl MusicRenderer {
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};
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let mut tick: u32 = 0;
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let mut next_poll_time = SystemTime::now();
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while !stop_flag.load(Ordering::SeqCst) {
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if self.is_online() {
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@@ -327,7 +328,21 @@ impl MusicRenderer {
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}
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tick = tick.wrapping_add(1);
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thread::sleep(interval);
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// Calculate next poll time to maintain fixed interval
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next_poll_time += interval;
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// Sleep until next poll time (or skip if we're already late)
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if let Ok(sleep_duration) = next_poll_time.duration_since(SystemTime::now()) {
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thread::sleep(sleep_duration);
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} else {
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// We're running late - log a warning and reset the schedule
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tracing::warn!(
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renderer = self.info.friendly_name(),
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"Watcher polling is running late, resetting schedule"
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);
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next_poll_time = SystemTime::now();
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}
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}
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debug!(
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@@ -338,21 +353,40 @@ impl MusicRenderer {
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/// Polls the backend and emits events for any detected changes.
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fn poll_and_emit_changes(&self, tick: u32) {
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// Step 1: Read previous state WITHOUT holding the lock during network calls
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let prev_position = {
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let watched = self
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.watched_state
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.lock()
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.expect("WatchedState mutex poisoned");
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watched.position.clone()
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};
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// Step 2: Do all network calls WITHOUT holding any locks
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// This prevents blocking other threads that need to read watched_state
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let position = self.playback_position().ok();
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let raw_state = self.playback_state().ok();
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// Poll volume and mute every other tick (1 second at 500ms interval)
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let (volume, mute, is_stream) = if tick % 2 == 0 {
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(
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self.volume().ok(),
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self.mute().ok(),
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Some(self.is_playing_a_stream()),
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)
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} else {
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(None, None, None)
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};
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// Step 3: Now acquire the lock and update state based on polling results
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let mut watched = self
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.watched_state
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.lock()
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.expect("WatchedState mutex poisoned");
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let prev_position = watched.position.clone();
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// First poll to check for metadata changes BEFORE getting patched position
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let raw_position = self
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.lock_backend_for("poll_position")
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.playback_position()
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.ok();
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// Detect and handle metadata/track changes FIRST
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if let Some(ref raw_pos) = raw_position {
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if let Some(metadata) = extract_track_metadata(raw_pos) {
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if let Some(ref pos) = position {
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if let Some(metadata) = extract_track_metadata(pos) {
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let metadata_changed = watched
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.metadata
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.as_ref()
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@@ -396,65 +430,78 @@ impl MusicRenderer {
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watched.metadata.as_ref().and_then(|m| m.title.as_ref()),
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metadata.title
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);
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// This resets track_start_time BEFORE we calculate position
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// Drop the lock before calling set_last_metadata to avoid nested locking
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drop(watched);
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self.set_last_metadata(Some(metadata.clone()));
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watched = self
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.watched_state
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.lock()
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.expect("WatchedState mutex poisoned");
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}
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// Emit event without holding watched lock
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let metadata_clone = metadata.clone();
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drop(watched);
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self.emit_event(RendererEvent::MetadataChanged {
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id: self.id(),
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metadata: metadata.clone(),
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metadata: metadata_clone,
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});
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watched = self
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.watched_state
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.lock()
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.expect("WatchedState mutex poisoned");
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watched.metadata = Some(metadata);
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}
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}
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}
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// Now get the fully patched position (with correct track_start_time and rel_time)
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if let Ok(mut position) = self.playback_position() {
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// Handle position updates
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if let Some(mut position) = position {
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// For continuous streams, manage duration to prevent it from decreasing
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let is_stream = self.is_playing_a_stream();
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if is_stream {
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if let Some(ref new_duration) = position.track_duration {
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let mut state = self.state.lock().unwrap();
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if let Some(stream_flag) = is_stream {
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if stream_flag {
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if let Some(ref new_duration) = position.track_duration {
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let mut state = self.state.lock().unwrap();
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// Parse durations to compare (HH:MM:SS format)
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let parse_duration = |dur_str: &str| -> Option<u32> {
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let parts: Vec<&str> = dur_str.split(':').collect();
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if parts.len() == 3 {
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let h: u32 = parts[0].parse().ok()?;
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let m: u32 = parts[1].parse().ok()?;
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let s: u32 = parts[2].parse().ok()?;
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Some(h * 3600 + m * 60 + s)
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} else {
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None
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}
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};
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// Parse durations to compare (HH:MM:SS format)
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let parse_duration = |dur_str: &str| -> Option<u32> {
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let parts: Vec<&str> = dur_str.split(':').collect();
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if parts.len() == 3 {
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let h: u32 = parts[0].parse().ok()?;
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let m: u32 = parts[1].parse().ok()?;
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let s: u32 = parts[2].parse().ok()?;
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Some(h * 3600 + m * 60 + s)
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} else {
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None
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}
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};
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match &state.current_track_duration {
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Some(stored_duration) => {
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// Compare new duration with stored one
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if let (Some(stored_secs), Some(new_secs)) = (
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parse_duration(stored_duration),
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parse_duration(new_duration),
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) {
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if new_secs > stored_secs {
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// Duration increased: update stored value and use new one
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tracing::debug!(
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"MusicRenderer [{}]: Stream duration increased: {} -> {}",
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self.info.friendly_name(),
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stored_duration,
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new_duration
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);
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state.current_track_duration = Some(new_duration.clone());
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} else {
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// Duration decreased or equal: keep stored value
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position.track_duration = Some(stored_duration.clone());
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match &state.current_track_duration {
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Some(stored_duration) => {
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// Compare new duration with stored one
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if let (Some(stored_secs), Some(new_secs)) = (
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parse_duration(stored_duration),
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parse_duration(new_duration),
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) {
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if new_secs > stored_secs {
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// Duration increased: update stored value and use new one
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tracing::debug!(
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"MusicRenderer [{}]: Stream duration increased: {} -> {}",
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self.info.friendly_name(),
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stored_duration,
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new_duration
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);
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state.current_track_duration = Some(new_duration.clone());
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} else {
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// Duration decreased or equal: keep stored value
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position.track_duration = Some(stored_duration.clone());
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}
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}
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}
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}
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None => {
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// First time: store the duration
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state.current_track_duration = Some(new_duration.clone());
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None => {
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// First time: store the duration
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state.current_track_duration = Some(new_duration.clone());
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}
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}
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}
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}
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@@ -478,17 +525,23 @@ impl MusicRenderer {
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.unwrap_or(true);
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if changed {
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let position_clone = position.clone();
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drop(watched);
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self.emit_event(RendererEvent::PositionChanged {
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id: self.id(),
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position: position.clone(),
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position: position_clone,
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});
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watched = self
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.watched_state
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.lock()
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.expect("WatchedState mutex poisoned");
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}
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watched.position = Some(position);
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}
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// Poll state every tick
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if let Ok(raw_state) = self.playback_state() {
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if let Some(raw_state) = raw_state {
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let logical_state = compute_logical_playback_state(
|
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&raw_state,
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prev_position.as_ref(),
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@@ -503,15 +556,16 @@ impl MusicRenderer {
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// Emit event only for non-transient states to reduce noise
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if changed && !matches!(logical_state, PlaybackState::Transitioning) {
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let state_clone = logical_state.clone();
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drop(watched);
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self.emit_event(RendererEvent::StateChanged {
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id: self.id(),
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state: logical_state.clone(),
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state: state_clone.clone(),
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});
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// Handle auto-advance logic internally
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// Release the lock before calling handle_state_change to avoid deadlock
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drop(watched);
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self.handle_state_change(&logical_state);
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self.handle_state_change(&state_clone);
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|
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watched = self
|
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.watched_state
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.lock()
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@@ -521,41 +575,55 @@ impl MusicRenderer {
|
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watched.state = Some(logical_state);
|
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}
|
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|
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// Poll volume and mute every other tick (1 second at 500ms interval)
|
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if tick % 2 == 0 {
|
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if let Ok(volume) = self.volume() {
|
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if watched.volume != Some(volume) {
|
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self.emit_event(RendererEvent::VolumeChanged {
|
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id: self.id(),
|
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volume,
|
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});
|
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watched.volume = Some(volume);
|
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}
|
||||
// Handle volume/mute updates (polled every other tick)
|
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if let Some(vol) = volume {
|
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if watched.volume != Some(vol) {
|
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drop(watched);
|
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self.emit_event(RendererEvent::VolumeChanged {
|
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id: self.id(),
|
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volume: vol,
|
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});
|
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watched = self
|
||||
.watched_state
|
||||
.lock()
|
||||
.expect("WatchedState mutex poisoned");
|
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watched.volume = Some(vol);
|
||||
}
|
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}
|
||||
|
||||
if let Ok(mute) = self.mute() {
|
||||
if watched.mute != Some(mute) {
|
||||
self.emit_event(RendererEvent::MuteChanged {
|
||||
id: self.id(),
|
||||
mute,
|
||||
});
|
||||
watched.mute = Some(mute);
|
||||
}
|
||||
if let Some(m) = mute {
|
||||
if watched.mute != Some(m) {
|
||||
drop(watched);
|
||||
self.emit_event(RendererEvent::MuteChanged {
|
||||
id: self.id(),
|
||||
mute: m,
|
||||
});
|
||||
watched = self
|
||||
.watched_state
|
||||
.lock()
|
||||
.expect("WatchedState mutex poisoned");
|
||||
watched.mute = Some(m);
|
||||
}
|
||||
}
|
||||
|
||||
// Check stream state (every other tick to avoid excessive polling)
|
||||
let is_stream = self.is_playing_a_stream();
|
||||
if watched.is_stream != Some(is_stream) {
|
||||
// Check stream state (every other tick to avoid excessive polling)
|
||||
if let Some(stream) = is_stream {
|
||||
if watched.is_stream != Some(stream) {
|
||||
tracing::info!(
|
||||
"Stream state changed for renderer {}: is_stream={}",
|
||||
self.id().0,
|
||||
is_stream
|
||||
stream
|
||||
);
|
||||
drop(watched);
|
||||
self.emit_event(RendererEvent::StreamStateChanged {
|
||||
id: self.id(),
|
||||
is_stream,
|
||||
is_stream: stream,
|
||||
});
|
||||
watched.is_stream = Some(is_stream);
|
||||
watched = self
|
||||
.watched_state
|
||||
.lock()
|
||||
.expect("WatchedState mutex poisoned");
|
||||
watched.is_stream = Some(stream);
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -711,33 +779,23 @@ impl MusicRenderer {
|
||||
self.info.capabilities().supports_set_next()
|
||||
}
|
||||
|
||||
/// Returns true if currently playing a continuous stream (radio without duration).
|
||||
/// Returns true if the current track is a continuous stream (radio without duration).
|
||||
///
|
||||
/// This method queries the backend to determine if the current playback is a continuous
|
||||
/// stream. The detection is based on HTTP headers analysis performed when the URL was
|
||||
/// set via play_uri or when the track changed (for OpenHome).
|
||||
/// This method queries the backend's cached stream detection flag. The detection is based
|
||||
/// on HTTP headers analysis performed when the URL was set via play_uri or when the track
|
||||
/// changed (for OpenHome).
|
||||
///
|
||||
/// # Returns
|
||||
///
|
||||
/// `true` if:
|
||||
/// - The renderer is currently playing AND
|
||||
/// - The current track is a continuous stream (radio, live broadcast, etc.)
|
||||
/// `true` if the current track is a continuous stream (radio, live broadcast, etc.)
|
||||
/// `false` if playing a bounded media file or no track loaded
|
||||
///
|
||||
/// `false` otherwise (not playing, or playing a bounded media file)
|
||||
/// Note: This returns the stream status of the current track regardless of playback state
|
||||
/// (playing, paused, or stopped).
|
||||
pub fn is_playing_a_stream(&self) -> bool {
|
||||
let backend = self.lock_backend_for("is_playing_a_stream");
|
||||
|
||||
// Check if currently playing
|
||||
let is_playing = match backend.playback_state() {
|
||||
Ok(PlaybackState::Playing) => true,
|
||||
_ => false,
|
||||
};
|
||||
|
||||
if !is_playing {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Query backend for stream status
|
||||
// Query backend for stream status (already cached by backends)
|
||||
match &*backend {
|
||||
MusicRendererBackend::Upnp(upnp) => upnp.is_continuous_stream(),
|
||||
MusicRendererBackend::OpenHome(oh) => oh.is_continuous_stream(),
|
||||
|
||||
@@ -1,4 +1,5 @@
|
||||
use std::sync::{Arc, Mutex};
|
||||
use std::time::SystemTime;
|
||||
|
||||
use crate::DeviceIdentity;
|
||||
use crate::music_renderer::capabilities::{
|
||||
@@ -22,6 +23,27 @@ use crate::upnp_clients::{
|
||||
};
|
||||
use tracing::debug;
|
||||
|
||||
/// Cache for playback position to avoid redundant SOAP calls
|
||||
#[derive(Debug)]
|
||||
struct PositionCache {
|
||||
/// Last cached position info
|
||||
last_position: Option<PlaybackPositionInfo>,
|
||||
/// Timestamp of last cache update
|
||||
last_update: Option<SystemTime>,
|
||||
/// Number of calls in the last second (for warning detection)
|
||||
calls_in_last_second: Vec<SystemTime>,
|
||||
}
|
||||
|
||||
impl PositionCache {
|
||||
fn new() -> Self {
|
||||
Self {
|
||||
last_position: None,
|
||||
last_update: None,
|
||||
calls_in_last_second: Vec::new(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct OpenHomeRenderer {
|
||||
playlist: Option<OhPlaylistClient>,
|
||||
@@ -36,6 +58,8 @@ pub struct OpenHomeRenderer {
|
||||
continuous_stream: Arc<Mutex<bool>>,
|
||||
/// Cached current track URI to detect track changes
|
||||
current_track_uri: Arc<Mutex<Option<String>>>,
|
||||
/// Position cache to avoid redundant SOAP calls (OpenHome has second-precision only)
|
||||
position_cache: Arc<Mutex<PositionCache>>,
|
||||
}
|
||||
|
||||
impl OpenHomeRenderer {
|
||||
@@ -58,6 +82,7 @@ impl OpenHomeRenderer {
|
||||
queue,
|
||||
continuous_stream: Arc::new(Mutex::new(false)),
|
||||
current_track_uri: Arc::new(Mutex::new(None)),
|
||||
position_cache: Arc::new(Mutex::new(PositionCache::new())),
|
||||
}
|
||||
}
|
||||
|
||||
@@ -307,6 +332,44 @@ impl PlaybackStatus for OpenHomeRenderer {
|
||||
|
||||
impl PlaybackPosition for OpenHomeRenderer {
|
||||
fn playback_position(&self) -> Result<PlaybackPositionInfo, ControlPointError> {
|
||||
let now = SystemTime::now();
|
||||
|
||||
// Check cache first
|
||||
{
|
||||
let mut cache = self.position_cache.lock().unwrap();
|
||||
|
||||
// Track calls for warning detection
|
||||
cache.calls_in_last_second.push(now);
|
||||
// Keep only calls from last second
|
||||
cache.calls_in_last_second.retain(|t| {
|
||||
now.duration_since(*t)
|
||||
.map(|d| d.as_millis() < 1000)
|
||||
.unwrap_or(false)
|
||||
});
|
||||
|
||||
// Warn if called more than 3 times in last second
|
||||
if cache.calls_in_last_second.len() > 3 {
|
||||
tracing::warn!(
|
||||
"OpenHome playback_position() called {} times in last second - possible inefficiency",
|
||||
cache.calls_in_last_second.len()
|
||||
);
|
||||
}
|
||||
|
||||
// Return cached value if it's less than 900ms old (OpenHome has second precision)
|
||||
if let (Some(last_pos), Some(last_update)) = (&cache.last_position, cache.last_update) {
|
||||
if let Ok(elapsed) = now.duration_since(last_update) {
|
||||
if elapsed.as_millis() < 900 {
|
||||
tracing::trace!(
|
||||
"OpenHome playback_position: returning cached value (age={}ms)",
|
||||
elapsed.as_millis()
|
||||
);
|
||||
return Ok(last_pos.clone());
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Cache miss or stale - fetch from backend
|
||||
let time_info = self.time_client_for("playback_position")?.position()?;
|
||||
|
||||
let mut track_id = None;
|
||||
@@ -379,14 +442,23 @@ impl PlaybackPosition for OpenHomeRenderer {
|
||||
rel_time
|
||||
);
|
||||
|
||||
Ok(PlaybackPositionInfo {
|
||||
let position_info = PlaybackPositionInfo {
|
||||
track: track_id,
|
||||
rel_time: Some(rel_time),
|
||||
abs_time: None,
|
||||
track_duration,
|
||||
track_metadata: track_metadata_xml,
|
||||
track_uri,
|
||||
})
|
||||
};
|
||||
|
||||
// Update cache with fresh data
|
||||
{
|
||||
let mut cache = self.position_cache.lock().unwrap();
|
||||
cache.last_position = Some(position_info.clone());
|
||||
cache.last_update = Some(now);
|
||||
}
|
||||
|
||||
Ok(position_info)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user