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fix(jukebox): guard scrobbleCtx with a mutex and fall back client ids

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scrobbleCtx is written from request-handling goroutines (Start/Skip/
Clear) and read from the async trackSwitcherGoroutine, which is a data
race on the context.Context interface value. Guard it with a RWMutex
and read it through a getScrobbleCtx() accessor.

Also fall back clientId/client to device-scoped values when the
context has none, so an empty clientId can't collide with another
player's session key in the scrobbler's playMap cache.

Addresses review feedback from gemini-code-assist on #5716.
This commit is contained in:
fossisawesome-macbook-with-linux 2026-07-05 00:30:58 -04:00
commit 144d048e7a
1 changed files with 24 additions and 3 deletions
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27
core/playback/device.go
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@ -37,10 +37,12 @@ type playbackDevice struct {
ActiveTrack Track
startTrackSwitcher sync.Once
playTracker scrobbler.PlayTracker
scrobbleMu sync.RWMutex
// scrobbleCtx holds the most recently seen request context (merged onto
// serviceCtx so it survives past the originating HTTP request), used to
// report playback state from the async trackSwitcherGoroutine, which has
// no request of its own.
// no request of its own. Written from request-handling goroutines, read
// from trackSwitcherGoroutine, so access is guarded by scrobbleMu.
scrobbleCtx context.Context
}
@ -274,10 +276,20 @@ func (pd *playbackDevice) isPlaying() bool {
// request has completed.
func (pd *playbackDevice) rememberScrobbleCtx(ctx context.Context) context.Context {
merged := request.AddValues(pd.serviceCtx, ctx)
pd.scrobbleMu.Lock()
pd.scrobbleCtx = merged
pd.scrobbleMu.Unlock()
return merged
}
// getScrobbleCtx returns the most recently remembered scrobble context,
// safe to call concurrently with rememberScrobbleCtx.
func (pd *playbackDevice) getScrobbleCtx() context.Context {
pd.scrobbleMu.RLock()
defer pd.scrobbleMu.RUnlock()
return pd.scrobbleCtx
}
// reportActiveTrackStarted reports to the scrobbler that the currently active
// track started playing. Must be called after switchActiveTrackByIndex.
func (pd *playbackDevice) reportActiveTrackStarted(ctx context.Context) {
@ -338,6 +350,15 @@ func (pd *playbackDevice) reportPlayback(ctx context.Context, mf model.MediaFile
if !ok {
clientId = player.ID
}
// Fall back to device-scoped identifiers so an empty clientId (e.g. no
// jukebox request has run yet) can't collide with another player's
// session key in the scrobbler's playMap cache.
if clientId == "" {
clientId = "jukebox-" + pd.Name
}
if client == "" {
client = "Jukebox"
}
err := pd.playTracker.ReportPlayback(ctx, scrobbler.ReportPlaybackParams{
MediaId: mf.ID,
PositionMs: positionMs,
@ -358,7 +379,7 @@ func (pd *playbackDevice) trackSwitcherGoroutine() {
case <-pd.PlaybackDone:
log.Debug("Track switching detected")
if pd.ActiveTrack != nil {
pd.reportActiveTrackFinished(pd.scrobbleCtx)
pd.reportActiveTrackFinished(pd.getScrobbleCtx())
pd.ActiveTrack.Close()
pd.ActiveTrack = nil
}
@ -372,7 +393,7 @@ func (pd *playbackDevice) trackSwitcherGoroutine() {
}
if pd.ActiveTrack != nil {
pd.ActiveTrack.Unpause()
pd.reportActiveTrackStarted(pd.scrobbleCtx)
pd.reportActiveTrackStarted(pd.getScrobbleCtx())
}
} else {
log.Debug("There is no song left in the playlist. Finish.")