diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx index 8b5c996..4fef7eb 100644 --- a/frontend/src/App.tsx +++ b/frontend/src/App.tsx @@ -160,6 +160,12 @@ const Room: Component = () => { send({ type: "shuffle_queue" }); }; + // Remove a queued track by id. The state machine no-ops if the track + // is active or already gone. + const handleRemoveQueueItem = (itemId: string) => { + send({ type: "remove_queue_item", item_id: itemId }); + }; + return (
@@ -253,6 +259,7 @@ const Room: Component = () => { onTogglePlaylist={handleTogglePlaylist} onMoveQueueItem={handleMoveQueueItem} onShuffleQueue={handleShuffleQueue} + onRemoveQueueItem={handleRemoveQueueItem} /> send({ type: "chat", content })} />
diff --git a/frontend/src/Queue.tsx b/frontend/src/Queue.tsx index 732b3f4..f12f70d 100644 --- a/frontend/src/Queue.tsx +++ b/frontend/src/Queue.tsx @@ -40,6 +40,7 @@ interface QueueProps { onTogglePlaylist?: (enabled: boolean) => void; onMoveQueueItem?: (from: number, to: number) => void; onShuffleQueue?: () => void; + onRemoveQueueItem?: (itemId: string) => void; } export function Queue(props: QueueProps) { @@ -102,6 +103,14 @@ export function Queue(props: QueueProps) { > ▼ +
)}
diff --git a/frontend/src/types.ts b/frontend/src/types.ts index e874e52..fe1af1b 100644 --- a/frontend/src/types.ts +++ b/frontend/src/types.ts @@ -68,4 +68,5 @@ export type ClientMessage = | { type: "set_playlist_enabled"; enabled: boolean } | { type: "ping" } | { type: "move_queue_item"; from: number; to: number } - | { type: "shuffle_queue" }; + | { type: "shuffle_queue" } + | { type: "remove_queue_item"; item_id: string }; diff --git a/src/room.rs b/src/room.rs index ea97cea..d3c50d8 100644 --- a/src/room.rs +++ b/src/room.rs @@ -67,6 +67,9 @@ pub(crate) enum RoomCommand { to: usize, }, ShuffleQueue, + RemoveQueueItem { + track_id: TrackId, + }, } /// Per-room event-loop actor. Owns all mutable state. @@ -406,6 +409,9 @@ impl RoomActor { RoomCommand::Shutdown => self.handle_shutdown().await, RoomCommand::MoveQueueItem { from, to } => self.handle_move_queue_item(from, to).await, RoomCommand::ShuffleQueue => self.handle_shuffle_queue().await, + RoomCommand::RemoveQueueItem { track_id } => { + self.handle_remove_queue_item(track_id).await + } } } @@ -708,6 +714,21 @@ impl RoomActor { false } + /// Remove a queued track. The state machine no-ops if the track is the + /// active one (you can't delete a playing track) or if it isn't in + /// the queue at all. + async fn handle_remove_queue_item(&mut self, track_id: TrackId) -> bool { + let effects = self + .state + .transition(&Event::RemoveQueueItem { track_id }, 0); + if effects.is_empty() { + return false; + } + self.persist_effects(&effects).await; + self.execute_effects(effects).await; + false + } + async fn handle_chat( &mut self, user_name: String, diff --git a/src/state.rs b/src/state.rs index 899e898..3c8a05b 100644 --- a/src/state.rs +++ b/src/state.rs @@ -97,6 +97,9 @@ pub(crate) enum Event { /// Shuffle the up-next queue deterministically. Same seed → same result. /// Empty/single-item queues are no-ops. Active track is not affected. ShuffleQueue { seed: u64 }, + /// Remove a track from the up-next queue. No-op if the track isn't + /// queued (active and history are unaffected). + RemoveQueueItem { track_id: TrackId }, } /// Side effects to execute after a transition. @@ -147,6 +150,10 @@ pub(crate) enum Effect { /// column for every queued track so a fresh `SELECT ... ORDER BY /// position` returns the new order. ReorderQueue { new_order: Vec }, + /// Delete a queued track from the store. Emitted alongside a + /// `PublishSnapshot` after the state machine removes the track from + /// its in-memory `queue` Vec. + RemoveQueuedTrack { track_id: TrackId }, } /// Pure playback state: no IO handles, no DB connections. @@ -203,6 +210,7 @@ impl PlaybackState { Event::SetPlaylistEnabled(enabled) => self.handle_set_playlist_enabled(*enabled), Event::MoveQueueItem { from, to } => self.handle_move_queue_item(*from, *to), Event::ShuffleQueue { seed } => self.handle_shuffle_queue(*seed), + Event::RemoveQueueItem { track_id } => self.handle_remove_queue_item(*track_id), } } @@ -533,6 +541,24 @@ impl PlaybackState { vec![Effect::ReorderQueue { new_order }, Effect::PublishSnapshot] } + /// Remove a track from the up-next queue. The active track and history + /// are unaffected. No-op (returns empty) if the track isn't in the + /// queue. After removal, the remaining queue positions are renumbered + /// via `Effect::ReorderQueue` so the store stays in sync. + fn handle_remove_queue_item(&mut self, track_id: TrackId) -> Vec { + let pos = self.queue.iter().position(|t| t.id == track_id); + let Some(_) = pos else { + return Vec::new(); + }; + self.queue.retain(|t| t.id != track_id); + let new_order: Vec = self.queue.iter().map(|t| t.id).collect(); + vec![ + Effect::RemoveQueuedTrack { track_id }, + Effect::ReorderQueue { new_order }, + Effect::PublishSnapshot, + ] + } + /// Pop the first track from the queue and start playing it. /// /// Returns effects for starting the pipeline and publishing state. @@ -1667,6 +1693,78 @@ mod tests { assert_eq!(s.active.as_ref().unwrap().id, original_active); assert_eq!(s.queue.len(), 5); } + + // --- queue item removal --- + + #[test] + fn test_remove_queue_item_basic() { + // Queue: [B, C, D], active A. Remove C → [B, D]. + let (mut s, ids) = queue_with(3); + let effects = s.transition(&Event::RemoveQueueItem { track_id: ids[2] }, 0); + assert_eq!(s.queue.len(), 2); + assert_eq!(s.queue[0].id, ids[1]); + assert_eq!(s.queue[1].id, ids[3]); + // Active track is untouched. + assert_eq!(s.active.as_ref().unwrap().id, ids[0]); + // Effects: delete, reorder, snapshot. + assert!(effects.iter().any(|e| matches!( + e, + Effect::RemoveQueuedTrack { track_id } if *track_id == ids[2] + ))); + assert!(effects.iter().any(|e| matches!( + e, + Effect::ReorderQueue { new_order } if new_order == &vec![ids[1], ids[3]] + ))); + assert!(effects.iter().any(|e| matches!(e, Effect::PublishSnapshot))); + } + + #[test] + fn test_remove_queue_item_unknown_id_is_noop() { + let (mut s, ids) = queue_with(3); + let ghost = track_id(0xdeadbeef); + let effects = s.transition(&Event::RemoveQueueItem { track_id: ghost }, 0); + assert_eq!(s.queue.len(), 3); + assert!(effects.is_empty()); + let _ = ids; + } + + #[test] + fn test_remove_queue_item_active_is_noop() { + // Active track is NOT in the queue Vec, so removing it should be a + // no-op. The state machine never lets you delete a playing track. + let (mut s, ids) = queue_with(2); + let active_id = s.active.as_ref().unwrap().id; + let effects = s.transition( + &Event::RemoveQueueItem { + track_id: active_id, + }, + 0, + ); + assert_eq!(s.queue.len(), 2); + assert!(effects.is_empty()); + let _ = ids; + } + + #[test] + fn test_remove_queue_item_empty_queue_is_noop() { + let mut s = PlaybackState::default(); + let effects = s.transition( + &Event::RemoveQueueItem { + track_id: track_id(1), + }, + 0, + ); + assert!(effects.is_empty()); + } + + #[test] + fn test_remove_queue_item_last_track() { + // Queue has 1 track, remove it → empty. + let (mut s, ids) = queue_with(1); + let effects = s.transition(&Event::RemoveQueueItem { track_id: ids[1] }, 0); + assert!(s.queue.is_empty()); + assert!(effects.iter().any(|e| matches!(e, Effect::PublishSnapshot))); + } } /// Deterministic simulation testing: random event sequences with invariant @@ -1701,13 +1799,24 @@ mod dst { MetadataUpdated(u64), DownloadResolved(u64), DownloadFailed(u64), - MoveQueueItem { from: u8, to: u8 }, - ShuffleQueue { seed: u64 }, + MoveQueueItem { + from: u8, + to: u8, + }, + ShuffleQueue { + seed: u64, + }, + /// Remove a queued track. `n` indexes into the same 0..12 track pool + /// as the other ops; if the track isn't in the queue the state + /// machine no-ops, mirroring the real-world "clicked X on a track + /// already removed" case. + RemoveQueueItem(u64), } fn op_strategy() -> impl Strategy> { - // Move and shuffle are weighted higher than the other ops so the new - // handlers get meaningful coverage in the 1024-case run. + // Move, shuffle, and remove are weighted higher than the other ops + // so the new queue-management handlers get meaningful coverage in + // the 1024-case run. let op = prop_oneof![ 2 => (0u64..12).prop_map(Op::Queue), 1 => Just(Op::Skip), @@ -1718,6 +1827,7 @@ mod dst { 1 => (0u64..12).prop_map(Op::DownloadFailed), 3 => (0u8..16, 0u8..16).prop_map(|(from, to)| Op::MoveQueueItem { from, to }), 2 => (0u64..1000).prop_map(|seed| Op::ShuffleQueue { seed }), + 3 => (0u64..12).prop_map(Op::RemoveQueueItem), ]; proptest::collection::vec(op, 0..50) } @@ -1831,6 +1941,7 @@ mod dst { let from_in = (*from as usize) < queue_len; let to_in = (*to as usize) < queue_len; let changed = from_in && to_in && from != to; + let moved_track_id = changed.then(|| state.queue[*from as usize].id); let expected_ids: Vec<_> = if changed { let mut q = state.queue.clone(); let t = q.remove(*from as usize); @@ -1851,6 +1962,13 @@ mod dst { actual_ids, expected_ids, "MoveQueueItem {from},{to} produced wrong order", ); + // The moved track must end at the destination index. + if let Some(id) = moved_track_id { + assert_eq!( + state.queue[*to as usize].id, id, + "moved track not at destination index" + ); + } if changed { assert!(effects.iter().any(|e| matches!(e, Effect::PublishSnapshot))); } else { @@ -1875,6 +1993,35 @@ mod dst { } effects } + Op::RemoveQueueItem(n) => { + // Pick the track id from the same 0..12 pool used by + // other ops. The state machine no-ops when the track + // isn't in the queue (or it's the active track), so + // this arm covers both the actual-remove and no-op + // cases. + let target = tid(*n); + let was_in_queue = state.queue.iter().any(|t| t.id == target); + let prev_len = state.queue.len(); + let effects = state.transition(&Event::RemoveQueueItem { track_id: target }, 0); + if was_in_queue { + assert_eq!( + state.queue.len(), + prev_len - 1, + "remove should shrink queue by exactly one", + ); + assert!( + !state.queue.iter().any(|t| t.id == target), + "removed track must not remain in queue", + ); + assert!(effects.iter().any(|e| matches!(e, Effect::PublishSnapshot))); + assert!(effects + .iter() + .any(|e| matches!(e, Effect::RemoveQueuedTrack { .. }))); + } else { + assert!(effects.is_empty(), "no-op remove must return no effects"); + } + effects + } }; check_invariants(&state, &effects, &queued_ids, &mut history_snapshot); @@ -1893,11 +2040,19 @@ mod dst { }, 0, ); - // Determinism: same event on identical state should produce same effects. - let mut clone = state.clone(); - let e1 = state.transition(&Event::Skip, 0); - let e2 = clone.transition(&Event::Skip, 0); - assert_eq!(e1, e2, "non-deterministic Skip on final state"); + // Determinism: same event on identical state should produce same + // effects. Tested across the main event families, not just Skip. + for event in &[ + Event::Skip, + Event::MoveQueueItem { from: 0, to: 0 }, + Event::ShuffleQueue { seed: 0 }, + Event::RemoveQueueItem { track_id: tid(0) }, + ] { + let mut clone = state.clone(); + let e1 = state.transition(event, 0); + let e2 = clone.transition(event, 0); + assert_eq!(e1, e2, "non-deterministic {event:?} on final state"); + } } fn check_invariants( @@ -2033,6 +2188,77 @@ mod dst { "AbortDownload without PersistFinished" ); } + + // === Queue-management invariants === + + // 10. ReorderQueue and RemoveQueuedTrack are state-changing: they + // must be followed by PublishSnapshot in the same transition. + let has_reorder = effects + .iter() + .any(|e| matches!(e, Effect::ReorderQueue { .. })); + let has_remove = effects + .iter() + .any(|e| matches!(e, Effect::RemoveQueuedTrack { .. })); + if has_reorder || has_remove { + assert!( + effects.iter().any(|e| matches!(e, Effect::PublishSnapshot)), + "queue-management effects without PublishSnapshot: {effects:?}" + ); + } + + // 11. Effect/state consistency: a ReorderQueue effect carries the + // post-transition queue order, so the state must match it. This + // catches handlers that mutate self.queue and emit a new_order + // that don't agree. + if let Some(new_order) = effects.iter().find_map(|e| { + if let Effect::ReorderQueue { new_order } = e { + Some(new_order.clone()) + } else { + None + } + }) { + let state_ids: Vec = state.queue.iter().map(|t| t.id).collect(); + assert_eq!( + state_ids, new_order, + "ReorderQueue's new_order doesn't match post-transition state.queue" + ); + } + + // 12. When RemoveQueuedTrack is emitted, the removed track must not + // be in the post-transition queue. + for e in effects { + if let Effect::RemoveQueuedTrack { track_id } = e { + assert!( + !state.queue.iter().any(|t| t.id == *track_id), + "RemoveQueuedTrack({track_id}) but track is still in state.queue" + ); + } + } + + // 13. When both RemoveQueuedTrack and ReorderQueue are emitted in + // the same transition, the removed track must not appear in + // new_order (the two effects must agree). + if let (Some(removed), Some(new_order)) = ( + effects.iter().find_map(|e| { + if let Effect::RemoveQueuedTrack { track_id } = e { + Some(*track_id) + } else { + None + } + }), + effects.iter().find_map(|e| { + if let Effect::ReorderQueue { new_order } = e { + Some(new_order) + } else { + None + } + }), + ) { + assert!( + !new_order.contains(&removed), + "ReorderQueue.new_order still contains just-removed track {removed}" + ); + } } fn is_persist_effect(e: &Effect) -> bool { @@ -2044,6 +2270,8 @@ mod dst { | Effect::PersistMetadata { .. } | Effect::AddPlaylistEntry { .. } | Effect::RemovePlaylistEntry(_) + | Effect::ReorderQueue { .. } + | Effect::RemoveQueuedTrack { .. } ) } diff --git a/src/store.rs b/src/store.rs index 02c409a..ca6fa96 100644 --- a/src/store.rs +++ b/src/store.rs @@ -298,6 +298,9 @@ impl RoomStore for InMemoryStore { // matched. The SQLite path handles position renumbering. let _ = new_order; } + Effect::RemoveQueuedTrack { track_id } => { + room.queue.retain(|t| t.id != *track_id); + } _ => {} } } @@ -619,6 +622,23 @@ impl SqliteStore { .await?; } } + Effect::RemoveQueuedTrack { track_id } => { + // Delete the track from the queue. The reorder effect + // that follows renumbers the remaining tracks, but + // keeping this as a separate statement means a partial + // failure leaves the queue in a recoverable state. + sqlx::query( + "DELETE FROM tracks + WHERE id = ?1 + AND room_id = ?2 + AND played = 0 + AND started_at_ms IS NULL", + ) + .bind(track_id.as_str_buf()) + .bind(room_id) + .execute(&mut *tx) + .await?; + } _ => {} } } diff --git a/src/transport.rs b/src/transport.rs index 2b389f2..d9514e2 100644 --- a/src/transport.rs +++ b/src/transport.rs @@ -44,6 +44,11 @@ enum WsClientMessage { }, /// Shuffle the entire queue (server picks the seed). ShuffleQueue, + /// Remove a queued track by id. No-op if the track is active or + /// already gone. + RemoveQueueItem { + item_id: TrackId, + }, } /// Run a WebSocket session for a single client. @@ -149,6 +154,11 @@ pub(crate) async fn handle_ws_session( WsClientMessage::ShuffleQueue => { let _ = cmd_tx.send(RoomCommand::ShuffleQueue).await; } + WsClientMessage::RemoveQueueItem { item_id } => { + let _ = cmd_tx + .send(RoomCommand::RemoveQueueItem { track_id: item_id }) + .await; + } } } } diff --git a/static/dist/assets/index-B3kVSRJi.js b/static/dist/assets/index-B3kVSRJi.js new file mode 100644 index 0000000..adb9176 --- /dev/null +++ b/static/dist/assets/index-B3kVSRJi.js @@ -0,0 +1 @@ +(function(){const t=document.createElement("link").relList;if(t&&t.supports&&t.supports("modulepreload"))return;for(const i of document.querySelectorAll('link[rel="modulepreload"]'))r(i);new MutationObserver(i=>{for(const o of i)if(o.type==="childList")for(const s of 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