feat(plugins): add ClearQueue function to remove pending tasks from a specified queue

Signed-off-by: Deluan <deluan@navidrome.org>

cmd/wire_gen.go

@@ -1,6 +1,6 @@
 // Code generated by Wire. DO NOT EDIT.
 
-//go:generate go run -mod=mod github.com/google/wire/cmd/wire gen -tags "netgo sqlite_fts5"
+//go:generate go run -mod=mod github.com/google/wire/cmd/wire gen -tags "netgo"
 //go:build !wireinject
 // +build !wireinject
 
@@ -16,7 +16,6 @@ import (
 	"github.com/navidrome/navidrome/core/artwork"
 	"github.com/navidrome/navidrome/core/external"
 	"github.com/navidrome/navidrome/core/ffmpeg"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/core/metrics"
 	"github.com/navidrome/navidrome/core/playback"
 	"github.com/navidrome/navidrome/core/playlists"
@@ -104,8 +103,7 @@ func CreateSubsonicAPIRouter(ctx context.Context) *subsonic.Router {
 	modelScanner := scanner.New(ctx, dataStore, cacheWarmer, broker, playlistsPlaylists, metricsMetrics)
 	playTracker := scrobbler.GetPlayTracker(dataStore, broker, manager)
 	playbackServer := playback.GetInstance(dataStore)
-	lyricsLyrics := lyrics.NewLyrics(manager)
-	router := subsonic.New(dataStore, artworkArtwork, mediaStreamer, archiver, players, provider, modelScanner, broker, playlistsPlaylists, playTracker, share, playbackServer, metricsMetrics, lyricsLyrics)
+	router := subsonic.New(dataStore, artworkArtwork, mediaStreamer, archiver, players, provider, modelScanner, broker, playlistsPlaylists, playTracker, share, playbackServer, metricsMetrics)
 	return router
 }
 
@@ -209,7 +207,7 @@ func getPluginManager() *plugins.Manager {
 
 // wire_injectors.go:
 
-var allProviders = wire.NewSet(core.Set, artwork.Set, server.New, subsonic.New, nativeapi.New, public.New, persistence.New, lastfm.NewRouter, listenbrainz.NewRouter, events.GetBroker, scanner.New, scanner.GetWatcher, metrics.GetPrometheusInstance, db.Db, plugins.GetManager, wire.Bind(new(agents.PluginLoader), new(*plugins.Manager)), wire.Bind(new(scrobbler.PluginLoader), new(*plugins.Manager)), wire.Bind(new(lyrics.PluginLoader), new(*plugins.Manager)), wire.Bind(new(nativeapi.PluginManager), new(*plugins.Manager)), wire.Bind(new(core.PluginUnloader), new(*plugins.Manager)), wire.Bind(new(plugins.PluginMetricsRecorder), new(metrics.Metrics)), wire.Bind(new(core.Watcher), new(scanner.Watcher)))
+var allProviders = wire.NewSet(core.Set, artwork.Set, server.New, subsonic.New, nativeapi.New, public.New, persistence.New, lastfm.NewRouter, listenbrainz.NewRouter, events.GetBroker, scanner.New, scanner.GetWatcher, metrics.GetPrometheusInstance, db.Db, plugins.GetManager, wire.Bind(new(agents.PluginLoader), new(*plugins.Manager)), wire.Bind(new(scrobbler.PluginLoader), new(*plugins.Manager)), wire.Bind(new(nativeapi.PluginManager), new(*plugins.Manager)), wire.Bind(new(core.PluginUnloader), new(*plugins.Manager)), wire.Bind(new(plugins.PluginMetricsRecorder), new(metrics.Metrics)), wire.Bind(new(core.Watcher), new(scanner.Watcher)))
 
 func GetPluginManager(ctx context.Context) *plugins.Manager {
 	manager := getPluginManager()

cmd/wire_injectors.go

@@ -11,7 +11,6 @@ import (
 	"github.com/navidrome/navidrome/core"
 	"github.com/navidrome/navidrome/core/agents"
 	"github.com/navidrome/navidrome/core/artwork"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/core/metrics"
 	"github.com/navidrome/navidrome/core/playback"
 	"github.com/navidrome/navidrome/core/scrobbler"
@@ -45,7 +44,6 @@ var allProviders = wire.NewSet(
 	plugins.GetManager,
 	wire.Bind(new(agents.PluginLoader), new(*plugins.Manager)),
 	wire.Bind(new(scrobbler.PluginLoader), new(*plugins.Manager)),
-	wire.Bind(new(lyrics.PluginLoader), new(*plugins.Manager)),
 	wire.Bind(new(nativeapi.PluginManager), new(*plugins.Manager)),
 	wire.Bind(new(core.PluginUnloader), new(*plugins.Manager)),
 	wire.Bind(new(plugins.PluginMetricsRecorder), new(metrics.Metrics)),

core/lyrics/lyrics.go

@@ -9,29 +9,7 @@ import (
 	"github.com/navidrome/navidrome/model"
 )
 
-// Lyrics can fetch lyrics for a media file.
-type Lyrics interface {
-	GetLyrics(ctx context.Context, mf *model.MediaFile) (model.LyricList, error)
-}
-
-// PluginLoader discovers and loads lyrics provider plugins.
-type PluginLoader interface {
-	LoadLyricsProvider(name string) (Lyrics, bool)
-}
-
-type lyricsService struct {
-	pluginLoader PluginLoader
-}
-
-// NewLyrics creates a new lyrics service. pluginLoader may be nil if no plugin
-// system is available.
-func NewLyrics(pluginLoader PluginLoader) Lyrics {
-	return &lyricsService{pluginLoader: pluginLoader}
-}
-
-// GetLyrics returns lyrics for the given media file, trying sources in the
-// order specified by conf.Server.LyricsPriority.
-func (l *lyricsService) GetLyrics(ctx context.Context, mf *model.MediaFile) (model.LyricList, error) {
+func GetLyrics(ctx context.Context, mf *model.MediaFile) (model.LyricList, error) {
 	var lyricsList model.LyricList
 	var err error
 
@@ -43,11 +21,11 @@ func (l *lyricsService) GetLyrics(ctx context.Context, mf *model.MediaFile) (mod
 		case strings.HasPrefix(pattern, "."):
 			lyricsList, err = fromExternalFile(ctx, mf, pattern)
 		default:
-			lyricsList, err = l.fromPlugin(ctx, mf, pattern)
+			log.Error(ctx, "Invalid lyric pattern", "pattern", pattern)
 		}
 
 		if err != nil {
-			log.Error(ctx, "error getting lyrics", "source", pattern, err)
+			log.Error(ctx, "error parsing lyrics", "source", pattern, err)
 		}
 
 		if len(lyricsList) > 0 {

core/lyrics/lyrics_test.go

@@ -3,7 +3,6 @@ package lyrics_test
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"os"
 
 	"github.com/navidrome/navidrome/conf"
@@ -73,8 +72,7 @@ var _ = Describe("sources", func() {
 
 	DescribeTable("Lyrics Priority", func(priority string, expected model.LyricList) {
 		conf.Server.LyricsPriority = priority
-		svc := lyrics.NewLyrics(nil)
-		list, err := svc.GetLyrics(ctx, &mf)
+		list, err := lyrics.GetLyrics(ctx, &mf)
 		Expect(err).To(BeNil())
 		Expect(list).To(Equal(expected))
 	},
@@ -109,8 +107,7 @@ var _ = Describe("sources", func() {
 			It("should fallback to embedded if an error happens when parsing file", func() {
 				conf.Server.LyricsPriority = ".mp3,embedded"
 
-				svc := lyrics.NewLyrics(nil)
-				list, err := svc.GetLyrics(ctx, &mf)
+				list, err := lyrics.GetLyrics(ctx, &mf)
 				Expect(err).To(BeNil())
 				Expect(list).To(Equal(embeddedLyrics))
 			})
@@ -118,94 +115,10 @@ var _ = Describe("sources", func() {
 			It("should return nothing if error happens when trying to parse file", func() {
 				conf.Server.LyricsPriority = ".mp3"
 
-				svc := lyrics.NewLyrics(nil)
-				list, err := svc.GetLyrics(ctx, &mf)
+				list, err := lyrics.GetLyrics(ctx, &mf)
 				Expect(err).To(BeNil())
 				Expect(list).To(BeEmpty())
 			})
 		})
 	})
-
-	Context("plugin sources", func() {
-		var mockLoader *mockPluginLoader
-
-		BeforeEach(func() {
-			mockLoader = &mockPluginLoader{}
-		})
-
-		It("should return lyrics from a plugin", func() {
-			conf.Server.LyricsPriority = "test-lyrics-plugin"
-			mockLoader.lyrics = unsyncedLyrics
-			svc := lyrics.NewLyrics(mockLoader)
-			list, err := svc.GetLyrics(ctx, &mf)
-			Expect(err).To(BeNil())
-			Expect(list).To(Equal(unsyncedLyrics))
-		})
-
-		It("should try plugin after embedded returns nothing", func() {
-			conf.Server.LyricsPriority = "embedded,test-lyrics-plugin"
-			mf.Lyrics = "" // No embedded lyrics
-			mockLoader.lyrics = unsyncedLyrics
-			svc := lyrics.NewLyrics(mockLoader)
-			list, err := svc.GetLyrics(ctx, &mf)
-			Expect(err).To(BeNil())
-			Expect(list).To(Equal(unsyncedLyrics))
-		})
-
-		It("should skip plugin if embedded has lyrics", func() {
-			conf.Server.LyricsPriority = "embedded,test-lyrics-plugin"
-			mockLoader.lyrics = unsyncedLyrics
-			svc := lyrics.NewLyrics(mockLoader)
-			list, err := svc.GetLyrics(ctx, &mf)
-			Expect(err).To(BeNil())
-			Expect(list).To(Equal(embeddedLyrics)) // embedded wins
-		})
-
-		It("should skip unknown plugin names gracefully", func() {
-			conf.Server.LyricsPriority = "nonexistent-plugin,embedded"
-			mockLoader.notFound = true
-			svc := lyrics.NewLyrics(mockLoader)
-			list, err := svc.GetLyrics(ctx, &mf)
-			Expect(err).To(BeNil())
-			Expect(list).To(Equal(embeddedLyrics)) // falls through to embedded
-		})
-
-		It("should handle plugin error gracefully", func() {
-			conf.Server.LyricsPriority = "test-lyrics-plugin,embedded"
-			mockLoader.err = fmt.Errorf("plugin error")
-			svc := lyrics.NewLyrics(mockLoader)
-			list, err := svc.GetLyrics(ctx, &mf)
-			Expect(err).To(BeNil())
-			Expect(list).To(Equal(embeddedLyrics)) // falls through to embedded
-		})
-	})
 })
-
-type mockPluginLoader struct {
-	lyrics   model.LyricList
-	err      error
-	notFound bool
-}
-
-func (m *mockPluginLoader) PluginNames(_ string) []string {
-	if m.notFound {
-		return nil
-	}
-	return []string{"test-lyrics-plugin"}
-}
-
-func (m *mockPluginLoader) LoadLyricsProvider(_ string) (lyrics.Lyrics, bool) {
-	if m.notFound {
-		return nil, false
-	}
-	return &mockLyricsProvider{lyrics: m.lyrics, err: m.err}, true
-}
-
-type mockLyricsProvider struct {
-	lyrics model.LyricList
-	err    error
-}
-
-func (m *mockLyricsProvider) GetLyrics(_ context.Context, _ *model.MediaFile) (model.LyricList, error) {
-	return m.lyrics, m.err
-}

core/lyrics/sources.go

@@ -49,27 +49,3 @@ func fromExternalFile(ctx context.Context, mf *model.MediaFile, suffix string) (
 
 	return model.LyricList{*lyrics}, nil
 }
-
-// fromPlugin attempts to load lyrics from a plugin with the given name.
-func (l *lyricsService) fromPlugin(ctx context.Context, mf *model.MediaFile, pluginName string) (model.LyricList, error) {
-	if l.pluginLoader == nil {
-		log.Debug(ctx, "Invalid lyric source", "source", pluginName)
-		return nil, nil
-	}
-
-	provider, ok := l.pluginLoader.LoadLyricsProvider(pluginName)
-	if !ok {
-		log.Warn(ctx, "Lyrics plugin not found", "plugin", pluginName)
-		return nil, nil
-	}
-
-	lyricsList, err := provider.GetLyrics(ctx, mf)
-	if err != nil {
-		return nil, err
-	}
-
-	if len(lyricsList) > 0 {
-		log.Trace(ctx, "Retrieved lyrics from plugin", "plugin", pluginName, "count", len(lyricsList))
-	}
-	return lyricsList, nil
-}

core/wire_providers.go

@@ -5,7 +5,6 @@ import (
 	"github.com/navidrome/navidrome/core/agents"
 	"github.com/navidrome/navidrome/core/external"
 	"github.com/navidrome/navidrome/core/ffmpeg"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/core/metrics"
 	"github.com/navidrome/navidrome/core/playback"
 	"github.com/navidrome/navidrome/core/playlists"
@@ -29,5 +28,4 @@ var Set = wire.NewSet(
 	scrobbler.GetPlayTracker,
 	playback.GetInstance,
 	metrics.GetInstance,
-	lyrics.NewLyrics,
 )

plugins/capabilities/lyrics.go

@@ -1,26 +0,0 @@
-package capabilities
-
-// Lyrics provides lyrics for a given track from external sources.
-//
-//nd:capability name=lyrics required=true
-type Lyrics interface {
-	//nd:export name=nd_lyrics_get_lyrics
-	GetLyrics(GetLyricsRequest) (GetLyricsResponse, error)
-}
-
-// GetLyricsRequest contains the track information for lyrics lookup.
-type GetLyricsRequest struct {
-	Track TrackInfo `json:"track"`
-}
-
-// GetLyricsResponse contains the lyrics returned by the plugin.
-type GetLyricsResponse struct {
-	Lyrics []LyricsText `json:"lyrics"`
-}
-
-// LyricsText represents a single set of lyrics in raw text format.
-// Text can be plain text or LRC format — Navidrome will parse it.
-type LyricsText struct {
-	Lang string `json:"lang,omitempty"`
-	Text string `json:"text"`
-}

plugins/capabilities/lyrics.yaml

@@ -1,115 +0,0 @@
-version: v1-draft
-exports:
-    nd_lyrics_get_lyrics:
-        input:
-            $ref: '#/components/schemas/GetLyricsRequest'
-            contentType: application/json
-        output:
-            $ref: '#/components/schemas/GetLyricsResponse'
-            contentType: application/json
-components:
-    schemas:
-        ArtistRef:
-            description: ArtistRef is a reference to an artist with name and optional MBID.
-            properties:
-                id:
-                    type: string
-                    description: ID is the internal Navidrome artist ID (if known).
-                name:
-                    type: string
-                    description: Name is the artist name.
-                mbid:
-                    type: string
-                    description: MBID is the MusicBrainz ID for the artist.
-            required:
-                - name
-        GetLyricsRequest:
-            description: GetLyricsRequest contains the track information for lyrics lookup.
-            properties:
-                track:
-                    $ref: '#/components/schemas/TrackInfo'
-            required:
-                - track
-        GetLyricsResponse:
-            description: GetLyricsResponse contains the lyrics returned by the plugin.
-            properties:
-                lyrics:
-                    type: array
-                    items:
-                        $ref: '#/components/schemas/LyricsText'
-            required:
-                - lyrics
-        LyricsText:
-            description: |-
-                LyricsText represents a single set of lyrics in raw text format.
-                Text can be plain text or LRC format — Navidrome will parse it.
-            properties:
-                lang:
-                    type: string
-                text:
-                    type: string
-            required:
-                - text
-        TrackInfo:
-            description: TrackInfo contains track metadata for scrobbling.
-            properties:
-                id:
-                    type: string
-                    description: ID is the internal Navidrome track ID.
-                title:
-                    type: string
-                    description: Title is the track title.
-                album:
-                    type: string
-                    description: Album is the album name.
-                artist:
-                    type: string
-                    description: Artist is the formatted artist name for display (e.g., "Artist1 • Artist2").
-                albumArtist:
-                    type: string
-                    description: AlbumArtist is the formatted album artist name for display.
-                artists:
-                    type: array
-                    description: Artists is the list of track artists.
-                    items:
-                        $ref: '#/components/schemas/ArtistRef'
-                albumArtists:
-                    type: array
-                    description: AlbumArtists is the list of album artists.
-                    items:
-                        $ref: '#/components/schemas/ArtistRef'
-                duration:
-                    type: number
-                    format: float
-                    description: Duration is the track duration in seconds.
-                trackNumber:
-                    type: integer
-                    format: int32
-                    description: TrackNumber is the track number on the album.
-                discNumber:
-                    type: integer
-                    format: int32
-                    description: DiscNumber is the disc number.
-                mbzRecordingId:
-                    type: string
-                    description: MBZRecordingID is the MusicBrainz recording ID.
-                mbzAlbumId:
-                    type: string
-                    description: MBZAlbumID is the MusicBrainz album/release ID.
-                mbzReleaseGroupId:
-                    type: string
-                    description: MBZReleaseGroupID is the MusicBrainz release group ID.
-                mbzReleaseTrackId:
-                    type: string
-                    description: MBZReleaseTrackID is the MusicBrainz release track ID.
-            required:
-                - id
-                - title
-                - album
-                - artist
-                - albumArtist
-                - artists
-                - albumArtists
-                - duration
-                - trackNumber
-                - discNumber

plugins/capabilities/taskworker.go

@@ -0,0 +1,27 @@
+package capabilities
+
+// TaskWorker provides task execution handling.
+// This capability allows plugins to receive callbacks when their queued tasks
+// are ready to execute. Plugins that use the taskqueue host service must
+// implement this capability.
+//
+//nd:capability name=taskworker
+type TaskWorker interface {
+	// OnTaskExecute is called when a queued task is ready to run.
+	// The returned string is a status/result message stored in the tasks table.
+	// Return an error to trigger retry (if retries are configured).
+	//nd:export name=nd_task_execute
+	OnTaskExecute(TaskExecuteRequest) (string, error)
+}
+
+// TaskExecuteRequest is the request provided when a task is ready to execute.
+type TaskExecuteRequest struct {
+	// QueueName is the name of the queue this task belongs to.
+	QueueName string `json:"queueName"`
+	// TaskID is the unique identifier for this task.
+	TaskID string `json:"taskId"`
+	// Payload is the opaque data provided when the task was enqueued.
+	Payload []byte `json:"payload"`
+	// Attempt is the current attempt number (1-based: first attempt = 1).
+	Attempt int32 `json:"attempt"`
+}

plugins/capabilities/taskworker.yaml

@@ -0,0 +1,38 @@
+version: v1-draft
+exports:
+    nd_task_execute:
+        description: |-
+            OnTaskExecute is called when a queued task is ready to run.
+            The returned string is a status/result message stored in the tasks table.
+            Return an error to trigger retry (if retries are configured).
+        input:
+            $ref: '#/components/schemas/TaskExecuteRequest'
+            contentType: application/json
+        output:
+            type: string
+            contentType: application/json
+components:
+    schemas:
+        TaskExecuteRequest:
+            description: TaskExecuteRequest is the request provided when a task is ready to execute.
+            properties:
+                queueName:
+                    type: string
+                    description: QueueName is the name of the queue this task belongs to.
+                taskId:
+                    type: string
+                    description: TaskID is the unique identifier for this task.
+                payload:
+                    type: array
+                    description: Payload is the opaque data provided when the task was enqueued.
+                    items:
+                        type: object
+                attempt:
+                    type: integer
+                    format: int32
+                    description: 'Attempt is the current attempt number (1-based: first attempt = 1).'
+            required:
+                - queueName
+                - taskId
+                - payload
+                - attempt

plugins/host/task.go

@@ -0,0 +1,73 @@
+package host
+
+import "context"
+
+// TaskInfo holds the current state of a task.
+type TaskInfo struct {
+	// Status is the current task status: "pending", "running",
+	// "completed", "failed", or "cancelled".
+	Status string `json:"status"`
+	// Message is the status/result message returned by the plugin callback.
+	Message string `json:"message"`
+	// Attempt is the current or last attempt number (1-based).
+	Attempt int32 `json:"attempt"`
+}
+
+// QueueConfig holds configuration for a task queue.
+type QueueConfig struct {
+	// Concurrency is the max number of parallel workers. Default: 1.
+	// Capped by the plugin's manifest maxConcurrency.
+	Concurrency int32 `json:"concurrency"`
+
+	// MaxRetries is the number of times to retry a failed task. Default: 0.
+	MaxRetries int32 `json:"maxRetries"`
+
+	// BackoffMs is the initial backoff between retries in milliseconds.
+	// Doubles each retry (exponential: backoffMs * 2^(attempt-1)). Default: 1000.
+	BackoffMs int64 `json:"backoffMs"`
+
+	// DelayMs is the minimum delay between starting consecutive tasks
+	// in milliseconds. Useful for rate limiting. Default: 0.
+	DelayMs int64 `json:"delayMs"`
+
+	// RetentionMs is how long completed/failed/cancelled tasks are kept
+	// in milliseconds. Default: 3600000 (1h). Min: 60000 (1m). Max: 604800000 (1w).
+	RetentionMs int64 `json:"retentionMs"`
+}
+
+// TaskService provides persistent task queues for plugins.
+//
+// This service allows plugins to create named queues with configurable concurrency,
+// retry policies, and rate limiting. Tasks are persisted to SQLite and survive
+// server restarts. When a task is ready to execute, the host calls the plugin's
+// nd_task_execute callback function.
+//
+//nd:hostservice name=Task permission=taskqueue
+type TaskService interface {
+	// CreateQueue creates a named task queue with the given configuration.
+	// Zero-value fields in config use sensible defaults.
+	// If a queue with the same name already exists, returns an error.
+	// On startup, this also recovers any stale "running" tasks from a previous crash.
+	//nd:hostfunc
+	CreateQueue(ctx context.Context, name string, config QueueConfig) error
+
+	// Enqueue adds a task to the named queue. Returns the task ID.
+	// payload is opaque bytes passed back to the plugin on execution.
+	//nd:hostfunc
+	Enqueue(ctx context.Context, queueName string, payload []byte) (string, error)
+
+	// Get returns the current state of a task including its status,
+	// message, and attempt count.
+	//nd:hostfunc
+	Get(ctx context.Context, taskID string) (*TaskInfo, error)
+
+	// Cancel cancels a pending task. Returns error if already
+	// running, completed, or failed.
+	//nd:hostfunc
+	Cancel(ctx context.Context, taskID string) error
+
+	// ClearQueue removes all pending tasks from the named queue.
+	// Running tasks are not affected. Returns the number of tasks removed.
+	//nd:hostfunc
+	ClearQueue(ctx context.Context, queueName string) (int64, error)
+}

plugins/host/task_gen.go

@@ -0,0 +1,266 @@
+// Code generated by ndpgen. DO NOT EDIT.
+
+package host
+
+import (
+	"context"
+	"encoding/json"
+
+	extism "github.com/extism/go-sdk"
+)
+
+// TaskCreateQueueRequest is the request type for Task.CreateQueue.
+type TaskCreateQueueRequest struct {
+	Name   string      `json:"name"`
+	Config QueueConfig `json:"config"`
+}
+
+// TaskCreateQueueResponse is the response type for Task.CreateQueue.
+type TaskCreateQueueResponse struct {
+	Error string `json:"error,omitempty"`
+}
+
+// TaskEnqueueRequest is the request type for Task.Enqueue.
+type TaskEnqueueRequest struct {
+	QueueName string `json:"queueName"`
+	Payload   []byte `json:"payload"`
+}
+
+// TaskEnqueueResponse is the response type for Task.Enqueue.
+type TaskEnqueueResponse struct {
+	Result string `json:"result,omitempty"`
+	Error  string `json:"error,omitempty"`
+}
+
+// TaskGetRequest is the request type for Task.Get.
+type TaskGetRequest struct {
+	TaskID string `json:"taskId"`
+}
+
+// TaskGetResponse is the response type for Task.Get.
+type TaskGetResponse struct {
+	Result *TaskInfo `json:"result,omitempty"`
+	Error  string    `json:"error,omitempty"`
+}
+
+// TaskCancelRequest is the request type for Task.Cancel.
+type TaskCancelRequest struct {
+	TaskID string `json:"taskId"`
+}
+
+// TaskCancelResponse is the response type for Task.Cancel.
+type TaskCancelResponse struct {
+	Error string `json:"error,omitempty"`
+}
+
+// TaskClearQueueRequest is the request type for Task.ClearQueue.
+type TaskClearQueueRequest struct {
+	QueueName string `json:"queueName"`
+}
+
+// TaskClearQueueResponse is the response type for Task.ClearQueue.
+type TaskClearQueueResponse struct {
+	Result int64  `json:"result,omitempty"`
+	Error  string `json:"error,omitempty"`
+}
+
+// RegisterTaskHostFunctions registers Task service host functions.
+// The returned host functions should be added to the plugin's configuration.
+func RegisterTaskHostFunctions(service TaskService) []extism.HostFunction {
+	return []extism.HostFunction{
+		newTaskCreateQueueHostFunction(service),
+		newTaskEnqueueHostFunction(service),
+		newTaskGetHostFunction(service),
+		newTaskCancelHostFunction(service),
+		newTaskClearQueueHostFunction(service),
+	}
+}
+
+func newTaskCreateQueueHostFunction(service TaskService) extism.HostFunction {
+	return extism.NewHostFunctionWithStack(
+		"task_createqueue",
+		func(ctx context.Context, p *extism.CurrentPlugin, stack []uint64) {
+			// Read JSON request from plugin memory
+			reqBytes, err := p.ReadBytes(stack[0])
+			if err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+			var req TaskCreateQueueRequest
+			if err := json.Unmarshal(reqBytes, &req); err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+
+			// Call the service method
+			if svcErr := service.CreateQueue(ctx, req.Name, req.Config); svcErr != nil {
+				taskWriteError(p, stack, svcErr)
+				return
+			}
+
+			// Write JSON response to plugin memory
+			resp := TaskCreateQueueResponse{}
+			taskWriteResponse(p, stack, resp)
+		},
+		[]extism.ValueType{extism.ValueTypePTR},
+		[]extism.ValueType{extism.ValueTypePTR},
+	)
+}
+
+func newTaskEnqueueHostFunction(service TaskService) extism.HostFunction {
+	return extism.NewHostFunctionWithStack(
+		"task_enqueue",
+		func(ctx context.Context, p *extism.CurrentPlugin, stack []uint64) {
+			// Read JSON request from plugin memory
+			reqBytes, err := p.ReadBytes(stack[0])
+			if err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+			var req TaskEnqueueRequest
+			if err := json.Unmarshal(reqBytes, &req); err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+
+			// Call the service method
+			result, svcErr := service.Enqueue(ctx, req.QueueName, req.Payload)
+			if svcErr != nil {
+				taskWriteError(p, stack, svcErr)
+				return
+			}
+
+			// Write JSON response to plugin memory
+			resp := TaskEnqueueResponse{
+				Result: result,
+			}
+			taskWriteResponse(p, stack, resp)
+		},
+		[]extism.ValueType{extism.ValueTypePTR},
+		[]extism.ValueType{extism.ValueTypePTR},
+	)
+}
+
+func newTaskGetHostFunction(service TaskService) extism.HostFunction {
+	return extism.NewHostFunctionWithStack(
+		"task_get",
+		func(ctx context.Context, p *extism.CurrentPlugin, stack []uint64) {
+			// Read JSON request from plugin memory
+			reqBytes, err := p.ReadBytes(stack[0])
+			if err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+			var req TaskGetRequest
+			if err := json.Unmarshal(reqBytes, &req); err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+
+			// Call the service method
+			result, svcErr := service.Get(ctx, req.TaskID)
+			if svcErr != nil {
+				taskWriteError(p, stack, svcErr)
+				return
+			}
+
+			// Write JSON response to plugin memory
+			resp := TaskGetResponse{
+				Result: result,
+			}
+			taskWriteResponse(p, stack, resp)
+		},
+		[]extism.ValueType{extism.ValueTypePTR},
+		[]extism.ValueType{extism.ValueTypePTR},
+	)
+}
+
+func newTaskCancelHostFunction(service TaskService) extism.HostFunction {
+	return extism.NewHostFunctionWithStack(
+		"task_cancel",
+		func(ctx context.Context, p *extism.CurrentPlugin, stack []uint64) {
+			// Read JSON request from plugin memory
+			reqBytes, err := p.ReadBytes(stack[0])
+			if err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+			var req TaskCancelRequest
+			if err := json.Unmarshal(reqBytes, &req); err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+
+			// Call the service method
+			if svcErr := service.Cancel(ctx, req.TaskID); svcErr != nil {
+				taskWriteError(p, stack, svcErr)
+				return
+			}
+
+			// Write JSON response to plugin memory
+			resp := TaskCancelResponse{}
+			taskWriteResponse(p, stack, resp)
+		},
+		[]extism.ValueType{extism.ValueTypePTR},
+		[]extism.ValueType{extism.ValueTypePTR},
+	)
+}
+
+func newTaskClearQueueHostFunction(service TaskService) extism.HostFunction {
+	return extism.NewHostFunctionWithStack(
+		"task_clearqueue",
+		func(ctx context.Context, p *extism.CurrentPlugin, stack []uint64) {
+			// Read JSON request from plugin memory
+			reqBytes, err := p.ReadBytes(stack[0])
+			if err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+			var req TaskClearQueueRequest
+			if err := json.Unmarshal(reqBytes, &req); err != nil {
+				taskWriteError(p, stack, err)
+				return
+			}
+
+			// Call the service method
+			result, svcErr := service.ClearQueue(ctx, req.QueueName)
+			if svcErr != nil {
+				taskWriteError(p, stack, svcErr)
+				return
+			}
+
+			// Write JSON response to plugin memory
+			resp := TaskClearQueueResponse{
+				Result: result,
+			}
+			taskWriteResponse(p, stack, resp)
+		},
+		[]extism.ValueType{extism.ValueTypePTR},
+		[]extism.ValueType{extism.ValueTypePTR},
+	)
+}
+
+// taskWriteResponse writes a JSON response to plugin memory.
+func taskWriteResponse(p *extism.CurrentPlugin, stack []uint64, resp any) {
+	respBytes, err := json.Marshal(resp)
+	if err != nil {
+		taskWriteError(p, stack, err)
+		return
+	}
+	respPtr, err := p.WriteBytes(respBytes)
+	if err != nil {
+		stack[0] = 0
+		return
+	}
+	stack[0] = respPtr
+}
+
+// taskWriteError writes an error response to plugin memory.
+func taskWriteError(p *extism.CurrentPlugin, stack []uint64, err error) {
+	errResp := struct {
+		Error string `json:"error"`
+	}{Error: err.Error()}
+	respBytes, _ := json.Marshal(errResp)
+	respPtr, _ := p.WriteBytes(respBytes)
+	stack[0] = respPtr
+}

plugins/host_taskqueue.go

@@ -0,0 +1,596 @@
+package plugins
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/navidrome/navidrome/conf"
+	"github.com/navidrome/navidrome/log"
+	"github.com/navidrome/navidrome/model/id"
+	"github.com/navidrome/navidrome/plugins/capabilities"
+	"github.com/navidrome/navidrome/plugins/host"
+	"golang.org/x/time/rate"
+)
+
+const (
+	defaultConcurrency int32 = 1
+	defaultBackoffMs   int64 = 1000
+	defaultRetentionMs int64 = 3_600_000   // 1 hour
+	minRetentionMs     int64 = 60_000      // 1 minute
+	maxRetentionMs     int64 = 604_800_000 // 1 week
+	maxQueueNameLength       = 128
+	maxPayloadSize           = 1 * 1024 * 1024 // 1MB
+	maxBackoffMs       int64 = 3_600_000       // 1 hour
+	cleanupInterval          = 5 * time.Minute
+	pollInterval             = 5 * time.Second
+	shutdownTimeout          = 10 * time.Second
+
+	taskStatusPending   = "pending"
+	taskStatusRunning   = "running"
+	taskStatusCompleted = "completed"
+	taskStatusFailed    = "failed"
+	taskStatusCancelled = "cancelled"
+)
+
+// CapabilityTaskWorker indicates the plugin can receive task execution callbacks.
+const CapabilityTaskWorker Capability = "TaskWorker"
+
+const FuncTaskWorkerCallback = "nd_task_execute"
+
+func init() {
+	registerCapability(CapabilityTaskWorker, FuncTaskWorkerCallback)
+}
+
+type queueState struct {
+	config  host.QueueConfig
+	signal  chan struct{}
+	limiter *rate.Limiter
+}
+
+// notifyWorkers sends a non-blocking signal to wake up queue workers.
+func (qs *queueState) notifyWorkers() {
+	select {
+	case qs.signal <- struct{}{}:
+	default:
+	}
+}
+
+// taskQueueServiceImpl implements host.TaskQueueService with SQLite persistence
+// and background worker goroutines for task execution.
+type taskQueueServiceImpl struct {
+	pluginName     string
+	manager        *Manager
+	maxConcurrency int32
+	db             *sql.DB
+	ctx            context.Context
+	cancel         context.CancelFunc
+	wg             sync.WaitGroup
+	mu             sync.Mutex
+	queues         map[string]*queueState
+
+	// For testing: override how callbacks are invoked
+	invokeCallbackFn func(ctx context.Context, queueName, taskID string, payload []byte, attempt int32) (string, error)
+}
+
+// newTaskQueueService creates a new taskQueueServiceImpl with its own SQLite database.
+func newTaskQueueService(pluginName string, manager *Manager, maxConcurrency int32) (*taskQueueServiceImpl, error) {
+	dataDir := filepath.Join(conf.Server.DataFolder, "plugins", pluginName)
+	if err := os.MkdirAll(dataDir, 0700); err != nil {
+		return nil, fmt.Errorf("creating plugin data directory: %w", err)
+	}
+
+	dbPath := filepath.Join(dataDir, "taskqueue.db")
+	db, err := sql.Open("sqlite3", dbPath+"?_busy_timeout=5000&_journal_mode=WAL&_foreign_keys=off")
+	if err != nil {
+		return nil, fmt.Errorf("opening taskqueue database: %w", err)
+	}
+
+	db.SetMaxOpenConns(3)
+	db.SetMaxIdleConns(1)
+
+	if err := createTaskQueueSchema(db); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("creating taskqueue schema: %w", err)
+	}
+
+	ctx, cancel := context.WithCancel(manager.ctx)
+
+	s := &taskQueueServiceImpl{
+		pluginName:     pluginName,
+		manager:        manager,
+		maxConcurrency: maxConcurrency,
+		db:             db,
+		ctx:            ctx,
+		cancel:         cancel,
+		queues:         make(map[string]*queueState),
+	}
+	s.invokeCallbackFn = s.defaultInvokeCallback
+
+	s.wg.Go(s.cleanupLoop)
+
+	log.Debug("Initialized plugin taskqueue", "plugin", pluginName, "path", dbPath, "maxConcurrency", maxConcurrency)
+	return s, nil
+}
+
+func createTaskQueueSchema(db *sql.DB) error {
+	_, err := db.Exec(`
+		CREATE TABLE IF NOT EXISTS queues (
+			name TEXT PRIMARY KEY,
+			concurrency INTEGER NOT NULL DEFAULT 1,
+			max_retries INTEGER NOT NULL DEFAULT 0,
+			backoff_ms INTEGER NOT NULL DEFAULT 1000,
+			delay_ms INTEGER NOT NULL DEFAULT 0,
+			retention_ms INTEGER NOT NULL DEFAULT 3600000
+		);
+
+		CREATE TABLE IF NOT EXISTS tasks (
+			id TEXT PRIMARY KEY,
+			queue_name TEXT NOT NULL REFERENCES queues(name),
+			payload BLOB NOT NULL,
+			status TEXT NOT NULL DEFAULT 'pending',
+			attempt INTEGER NOT NULL DEFAULT 0,
+			max_retries INTEGER NOT NULL,
+			next_run_at INTEGER NOT NULL,
+			created_at INTEGER NOT NULL,
+			updated_at INTEGER NOT NULL,
+			message TEXT NOT NULL DEFAULT ''
+		);
+
+		CREATE INDEX IF NOT EXISTS idx_tasks_dequeue ON tasks(queue_name, status, next_run_at);
+	`)
+	return err
+}
+
+// applyConfigDefaults fills zero-value config fields with sensible defaults
+// and clamps values to valid ranges, logging warnings for clamped values.
+func (s *taskQueueServiceImpl) applyConfigDefaults(ctx context.Context, name string, config *host.QueueConfig) {
+	if config.Concurrency <= 0 {
+		config.Concurrency = defaultConcurrency
+	}
+	if config.BackoffMs <= 0 {
+		config.BackoffMs = defaultBackoffMs
+	}
+	if config.RetentionMs <= 0 {
+		config.RetentionMs = defaultRetentionMs
+	}
+
+	if config.RetentionMs < minRetentionMs {
+		log.Warn(ctx, "TaskQueue retention clamped to minimum", "plugin", s.pluginName, "queue", name,
+			"requested", config.RetentionMs, "min", minRetentionMs)
+		config.RetentionMs = minRetentionMs
+	}
+	if config.RetentionMs > maxRetentionMs {
+		log.Warn(ctx, "TaskQueue retention clamped to maximum", "plugin", s.pluginName, "queue", name,
+			"requested", config.RetentionMs, "max", maxRetentionMs)
+		config.RetentionMs = maxRetentionMs
+	}
+}
+
+// clampConcurrency reduces config.Concurrency if it exceeds the remaining budget.
+// Returns an error when the concurrency budget is fully exhausted.
+// Must be called with s.mu held.
+func (s *taskQueueServiceImpl) clampConcurrency(ctx context.Context, name string, config *host.QueueConfig) error {
+	var allocated int32
+	for _, qs := range s.queues {
+		allocated += qs.config.Concurrency
+	}
+	available := s.maxConcurrency - allocated
+	if available <= 0 {
+		log.Warn(ctx, "TaskQueue concurrency budget exhausted", "plugin", s.pluginName, "queue", name,
+			"allocated", allocated, "maxConcurrency", s.maxConcurrency)
+		return fmt.Errorf("concurrency budget exhausted (%d/%d allocated)", allocated, s.maxConcurrency)
+	}
+	if config.Concurrency > available {
+		log.Warn(ctx, "TaskQueue concurrency clamped", "plugin", s.pluginName, "queue", name,
+			"requested", config.Concurrency, "available", available, "maxConcurrency", s.maxConcurrency)
+		config.Concurrency = available
+	}
+	return nil
+}
+
+func (s *taskQueueServiceImpl) CreateQueue(ctx context.Context, name string, config host.QueueConfig) error {
+	if len(name) == 0 {
+		return fmt.Errorf("queue name cannot be empty")
+	}
+	if len(name) > maxQueueNameLength {
+		return fmt.Errorf("queue name exceeds maximum length of %d bytes", maxQueueNameLength)
+	}
+
+	s.applyConfigDefaults(ctx, name, &config)
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if err := s.clampConcurrency(ctx, name, &config); err != nil {
+		return err
+	}
+
+	if _, exists := s.queues[name]; exists {
+		return fmt.Errorf("queue %q already exists", name)
+	}
+
+	// Upsert into queues table (idempotent across restarts)
+	_, err := s.db.ExecContext(ctx, `
+		INSERT INTO queues (name, concurrency, max_retries, backoff_ms, delay_ms, retention_ms)
+		VALUES (?, ?, ?, ?, ?, ?)
+		ON CONFLICT(name) DO UPDATE SET
+			concurrency = excluded.concurrency,
+			max_retries = excluded.max_retries,
+			backoff_ms = excluded.backoff_ms,
+			delay_ms = excluded.delay_ms,
+			retention_ms = excluded.retention_ms
+	`, name, config.Concurrency, config.MaxRetries, config.BackoffMs, config.DelayMs, config.RetentionMs)
+	if err != nil {
+		return fmt.Errorf("creating queue: %w", err)
+	}
+
+	// Reset stale running tasks from previous crash
+	now := time.Now().UnixMilli()
+	_, err = s.db.ExecContext(ctx, `
+		UPDATE tasks SET status = ?, updated_at = ? WHERE queue_name = ? AND status = ?
+	`, taskStatusPending, now, name, taskStatusRunning)
+	if err != nil {
+		return fmt.Errorf("resetting stale tasks: %w", err)
+	}
+
+	qs := &queueState{
+		config: config,
+		signal: make(chan struct{}, 1),
+	}
+	if config.DelayMs > 0 {
+		// Rate limit dispatches to enforce delay between tasks.
+		// Burst of 1 allows one immediate dispatch, then enforces the delay interval.
+		qs.limiter = rate.NewLimiter(rate.Every(time.Duration(config.DelayMs)*time.Millisecond), 1)
+	}
+	s.queues[name] = qs
+
+	for i := int32(0); i < config.Concurrency; i++ {
+		s.wg.Go(func() { s.worker(name, qs) })
+	}
+
+	log.Debug(ctx, "Created task queue", "plugin", s.pluginName, "queue", name,
+		"concurrency", config.Concurrency, "maxRetries", config.MaxRetries,
+		"backoffMs", config.BackoffMs, "delayMs", config.DelayMs, "retentionMs", config.RetentionMs)
+	return nil
+}
+
+func (s *taskQueueServiceImpl) Enqueue(ctx context.Context, queueName string, payload []byte) (string, error) {
+	s.mu.Lock()
+	qs, exists := s.queues[queueName]
+	s.mu.Unlock()
+
+	if !exists {
+		return "", fmt.Errorf("queue %q does not exist", queueName)
+	}
+	if len(payload) > maxPayloadSize {
+		return "", fmt.Errorf("payload size %d exceeds maximum of %d bytes", len(payload), maxPayloadSize)
+	}
+
+	taskID := id.NewRandom()
+	now := time.Now().UnixMilli()
+
+	_, err := s.db.ExecContext(ctx, `
+		INSERT INTO tasks (id, queue_name, payload, status, attempt, max_retries, next_run_at, created_at, updated_at)
+		VALUES (?, ?, ?, ?, 0, ?, ?, ?, ?)
+	`, taskID, queueName, payload, taskStatusPending, qs.config.MaxRetries, now, now, now)
+	if err != nil {
+		return "", fmt.Errorf("enqueuing task: %w", err)
+	}
+
+	qs.notifyWorkers()
+	log.Trace(ctx, "Enqueued task", "plugin", s.pluginName, "queue", queueName, "taskID", taskID)
+	return taskID, nil
+}
+
+// Get returns the current state of a task.
+func (s *taskQueueServiceImpl) Get(ctx context.Context, taskID string) (*host.TaskInfo, error) {
+	var info host.TaskInfo
+	err := s.db.QueryRowContext(ctx, `SELECT status, message, attempt FROM tasks WHERE id = ?`, taskID).
+		Scan(&info.Status, &info.Message, &info.Attempt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, fmt.Errorf("task %q not found", taskID)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("getting task info: %w", err)
+	}
+	return &info, nil
+}
+
+// Cancel cancels a pending task.
+func (s *taskQueueServiceImpl) Cancel(ctx context.Context, taskID string) error {
+	now := time.Now().UnixMilli()
+	result, err := s.db.ExecContext(ctx, `
+		UPDATE tasks SET status = ?, updated_at = ? WHERE id = ? AND status = ?
+	`, taskStatusCancelled, now, taskID, taskStatusPending)
+	if err != nil {
+		return fmt.Errorf("cancelling task: %w", err)
+	}
+
+	rowsAffected, err := result.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("checking cancel result: %w", err)
+	}
+
+	if rowsAffected == 0 {
+		// Check if task exists at all
+		var status string
+		err := s.db.QueryRowContext(ctx, `SELECT status FROM tasks WHERE id = ?`, taskID).Scan(&status)
+		if errors.Is(err, sql.ErrNoRows) {
+			return fmt.Errorf("task %q not found", taskID)
+		}
+		if err != nil {
+			return fmt.Errorf("checking task existence: %w", err)
+		}
+		return fmt.Errorf("task %q cannot be cancelled (status: %s)", taskID, status)
+	}
+
+	log.Trace(ctx, "Cancelled task", "plugin", s.pluginName, "taskID", taskID)
+	return nil
+}
+
+// ClearQueue removes all pending tasks from the named queue.
+// Running tasks are not affected. Returns the number of tasks removed.
+func (s *taskQueueServiceImpl) ClearQueue(ctx context.Context, queueName string) (int64, error) {
+	s.mu.Lock()
+	_, exists := s.queues[queueName]
+	s.mu.Unlock()
+
+	if !exists {
+		return 0, fmt.Errorf("queue %q does not exist", queueName)
+	}
+
+	now := time.Now().UnixMilli()
+	result, err := s.db.ExecContext(ctx, `
+		UPDATE tasks SET status = ?, updated_at = ? WHERE queue_name = ? AND status = ?
+	`, taskStatusCancelled, now, queueName, taskStatusPending)
+	if err != nil {
+		return 0, fmt.Errorf("clearing queue: %w", err)
+	}
+
+	cleared, err := result.RowsAffected()
+	if err != nil {
+		return 0, fmt.Errorf("checking clear result: %w", err)
+	}
+
+	if cleared > 0 {
+		log.Debug(ctx, "Cleared pending tasks from queue", "plugin", s.pluginName, "queue", queueName, "cleared", cleared)
+	}
+	return cleared, nil
+}
+
+// worker is the main loop for a single worker goroutine.
+func (s *taskQueueServiceImpl) worker(queueName string, qs *queueState) {
+	// Process any existing pending tasks immediately on startup
+	s.drainQueue(queueName, qs)
+
+	ticker := time.NewTicker(pollInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-s.ctx.Done():
+			return
+		case <-qs.signal:
+			s.drainQueue(queueName, qs)
+		case <-ticker.C:
+			s.drainQueue(queueName, qs)
+		}
+	}
+}
+
+func (s *taskQueueServiceImpl) drainQueue(queueName string, qs *queueState) {
+	for s.ctx.Err() == nil && s.processTask(queueName, qs) {
+	}
+}
+
+// processTask dequeues and processes a single task. Returns true if a task was processed.
+func (s *taskQueueServiceImpl) processTask(queueName string, qs *queueState) bool {
+	now := time.Now().UnixMilli()
+
+	// Atomically dequeue a task
+	var taskID string
+	var payload []byte
+	var attempt, maxRetries int32
+	err := s.db.QueryRowContext(s.ctx, `
+		UPDATE tasks SET status = ?, attempt = attempt + 1, updated_at = ?
+		WHERE id = (
+			SELECT id FROM tasks
+			WHERE queue_name = ? AND status = ? AND next_run_at <= ?
+			ORDER BY next_run_at, created_at LIMIT 1
+		)
+		RETURNING id, payload, attempt, max_retries
+	`, taskStatusRunning, now, queueName, taskStatusPending, now).Scan(&taskID, &payload, &attempt, &maxRetries)
+	if errors.Is(err, sql.ErrNoRows) {
+		return false
+	}
+	if err != nil {
+		log.Error(s.ctx, "Failed to dequeue task", "plugin", s.pluginName, "queue", queueName, err)
+		return false
+	}
+
+	// Enforce delay between task dispatches using a rate limiter.
+	// This is done after dequeue so that empty polls don't consume rate tokens.
+	if qs.limiter != nil {
+		if err := qs.limiter.Wait(s.ctx); err != nil {
+			// Context cancelled during wait — revert task to pending for recovery
+			s.revertTaskToPending(taskID)
+			return false
+		}
+	}
+
+	// Invoke callback
+	log.Debug(s.ctx, "Executing task", "plugin", s.pluginName, "queue", queueName, "taskID", taskID, "attempt", attempt)
+	message, callbackErr := s.invokeCallbackFn(s.ctx, queueName, taskID, payload, attempt)
+
+	// If context was cancelled (shutdown), revert task to pending for recovery
+	if s.ctx.Err() != nil {
+		s.revertTaskToPending(taskID)
+		return false
+	}
+
+	if callbackErr == nil {
+		s.completeTask(queueName, taskID, message)
+	} else {
+		s.handleTaskFailure(queueName, taskID, attempt, maxRetries, qs, callbackErr, message)
+	}
+	return true
+}
+
+func (s *taskQueueServiceImpl) completeTask(queueName, taskID, message string) {
+	now := time.Now().UnixMilli()
+	if _, err := s.db.ExecContext(s.ctx, `UPDATE tasks SET status = ?, message = ?, updated_at = ? WHERE id = ?`, taskStatusCompleted, message, now, taskID); err != nil {
+		log.Error(s.ctx, "Failed to mark task as completed", "plugin", s.pluginName, "taskID", taskID, err)
+	}
+	log.Debug(s.ctx, "Task completed", "plugin", s.pluginName, "queue", queueName, "taskID", taskID)
+}
+
+func (s *taskQueueServiceImpl) handleTaskFailure(queueName, taskID string, attempt, maxRetries int32, qs *queueState, callbackErr error, message string) {
+	log.Warn(s.ctx, "Task execution failed", "plugin", s.pluginName, "queue", queueName,
+		"taskID", taskID, "attempt", attempt, "maxRetries", maxRetries, "err", callbackErr)
+
+	// Use error message as fallback if no message was provided
+	if message == "" {
+		message = callbackErr.Error()
+	}
+
+	now := time.Now().UnixMilli()
+	if attempt > maxRetries {
+		if _, err := s.db.ExecContext(s.ctx, `UPDATE tasks SET status = ?, message = ?, updated_at = ? WHERE id = ?`, taskStatusFailed, message, now, taskID); err != nil {
+			log.Error(s.ctx, "Failed to mark task as failed", "plugin", s.pluginName, "taskID", taskID, err)
+		}
+		log.Warn(s.ctx, "Task failed after all retries", "plugin", s.pluginName, "queue", queueName, "taskID", taskID)
+		return
+	}
+
+	// Exponential backoff: backoffMs * 2^(attempt-1)
+	backoff := qs.config.BackoffMs << (attempt - 1)
+	if backoff <= 0 || backoff > maxBackoffMs {
+		backoff = maxBackoffMs
+	}
+	nextRunAt := now + backoff
+	if _, err := s.db.ExecContext(s.ctx, `
+		UPDATE tasks SET status = ?, next_run_at = ?, updated_at = ? WHERE id = ?
+	`, taskStatusPending, nextRunAt, now, taskID); err != nil {
+		log.Error(s.ctx, "Failed to reschedule task for retry", "plugin", s.pluginName, "taskID", taskID, err)
+	}
+
+	// Wake worker after backoff expires
+	time.AfterFunc(time.Duration(backoff)*time.Millisecond, func() {
+		qs.notifyWorkers()
+	})
+}
+
+// revertTaskToPending puts a running task back to pending status and decrements the attempt
+// counter (used during shutdown to ensure the interrupted attempt doesn't count).
+func (s *taskQueueServiceImpl) revertTaskToPending(taskID string) {
+	now := time.Now().UnixMilli()
+	_, err := s.db.Exec(`UPDATE tasks SET status = ?, attempt = MAX(attempt - 1, 0), updated_at = ? WHERE id = ? AND status = ?`, taskStatusPending, now, taskID, taskStatusRunning)
+	if err != nil {
+		log.Error("Failed to revert task to pending", "plugin", s.pluginName, "taskID", taskID, err)
+	}
+}
+
+// defaultInvokeCallback calls the plugin's nd_task_execute function.
+func (s *taskQueueServiceImpl) defaultInvokeCallback(ctx context.Context, queueName, taskID string, payload []byte, attempt int32) (string, error) {
+	s.manager.mu.RLock()
+	p, ok := s.manager.plugins[s.pluginName]
+	s.manager.mu.RUnlock()
+
+	if !ok {
+		return "", fmt.Errorf("plugin %s not loaded", s.pluginName)
+	}
+
+	input := capabilities.TaskExecuteRequest{
+		QueueName: queueName,
+		TaskID:    taskID,
+		Payload:   payload,
+		Attempt:   attempt,
+	}
+
+	message, err := callPluginFunction[capabilities.TaskExecuteRequest, string](ctx, p, FuncTaskWorkerCallback, input)
+	if err != nil {
+		return "", err
+	}
+	return message, nil
+}
+
+// cleanupLoop periodically removes terminal tasks past their retention period.
+func (s *taskQueueServiceImpl) cleanupLoop() {
+	ticker := time.NewTicker(cleanupInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-s.ctx.Done():
+			return
+		case <-ticker.C:
+			s.runCleanup()
+		}
+	}
+}
+
+// runCleanup deletes terminal tasks past their retention period.
+func (s *taskQueueServiceImpl) runCleanup() {
+	s.mu.Lock()
+	queues := make(map[string]*queueState, len(s.queues))
+	for k, v := range s.queues {
+		queues[k] = v
+	}
+	s.mu.Unlock()
+
+	now := time.Now().UnixMilli()
+	for name, qs := range queues {
+		result, err := s.db.ExecContext(s.ctx, `
+			DELETE FROM tasks WHERE queue_name = ? AND status IN (?, ?, ?) AND updated_at + ? < ?
+		`, name, taskStatusCompleted, taskStatusFailed, taskStatusCancelled, qs.config.RetentionMs, now)
+		if err != nil {
+			log.Error(s.ctx, "Failed to cleanup tasks", "plugin", s.pluginName, "queue", name, err)
+			continue
+		}
+		if deleted, _ := result.RowsAffected(); deleted > 0 {
+			log.Debug(s.ctx, "Cleaned up terminal tasks", "plugin", s.pluginName, "queue", name, "deleted", deleted)
+		}
+	}
+}
+
+// Close shuts down the task queue service, stopping all workers and closing the database.
+func (s *taskQueueServiceImpl) Close() error {
+	// Cancel context to signal all goroutines
+	s.cancel()
+
+	// Wait for goroutines with timeout
+	done := make(chan struct{})
+	go func() {
+		s.wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(shutdownTimeout):
+		log.Warn("TaskQueue shutdown timed out", "plugin", s.pluginName)
+	}
+
+	// Mark running tasks as pending for recovery on next startup
+	if s.db != nil {
+		now := time.Now().UnixMilli()
+		if _, err := s.db.Exec(`UPDATE tasks SET status = ?, updated_at = ? WHERE status = ?`, taskStatusPending, now, taskStatusRunning); err != nil {
+			log.Error("Failed to reset running tasks on shutdown", "plugin", s.pluginName, err)
+		}
+		log.Debug("Closing plugin taskqueue", "plugin", s.pluginName)
+		return s.db.Close()
+	}
+	return nil
+}
+
+// Compile-time verification
+var _ host.TaskService = (*taskQueueServiceImpl)(nil)
+var _ io.Closer = (*taskQueueServiceImpl)(nil)

plugins/lyrics_adapter.go

@@ -1,55 +0,0 @@
-package plugins
-
-import (
-	"context"
-
-	"github.com/navidrome/navidrome/log"
-	"github.com/navidrome/navidrome/model"
-	"github.com/navidrome/navidrome/plugins/capabilities"
-)
-
-const CapabilityLyrics Capability = "Lyrics"
-
-const (
-	FuncLyricsGetLyrics = "nd_lyrics_get_lyrics"
-)
-
-func init() {
-	registerCapability(
-		CapabilityLyrics,
-		FuncLyricsGetLyrics,
-	)
-}
-
-// LyricsPlugin adapts a WASM plugin with the Lyrics capability.
-type LyricsPlugin struct {
-	name   string
-	plugin *plugin
-}
-
-// GetLyrics calls the plugin to fetch lyrics, then parses the raw text responses
-// using model.ToLyrics.
-func (l *LyricsPlugin) GetLyrics(ctx context.Context, mf *model.MediaFile) (model.LyricList, error) {
-	req := capabilities.GetLyricsRequest{
-		Track: mediaFileToTrackInfo(mf),
-	}
-	resp, err := callPluginFunction[capabilities.GetLyricsRequest, capabilities.GetLyricsResponse](
-		ctx, l.plugin, FuncLyricsGetLyrics, req,
-	)
-	if err != nil {
-		return nil, err
-	}
-
-	var result model.LyricList
-	for _, lt := range resp.Lyrics {
-		parsed, err := model.ToLyrics(lt.Lang, lt.Text)
-		if err != nil {
-			log.Warn(ctx, "Error parsing plugin lyrics", "plugin", l.name, err)
-			continue
-		}
-		if parsed != nil && !parsed.IsEmpty() {
-			result = append(result, *parsed)
-		}
-	}
-	return result, nil
-}

plugins/lyrics_adapter_test.go

@@ -1,84 +0,0 @@
-//go:build !windows
-
-package plugins
-
-import (
-	"github.com/navidrome/navidrome/model"
-	. "github.com/onsi/ginkgo/v2"
-	. "github.com/onsi/gomega"
-)
-
-var _ = Describe("LyricsPlugin", Ordered, func() {
-	var (
-		lyricsManager *Manager
-		provider      *LyricsPlugin
-	)
-
-	BeforeAll(func() {
-		lyricsManager, _ = createTestManagerWithPlugins(nil,
-			"test-lyrics"+PackageExtension,
-			"test-metadata-agent"+PackageExtension,
-		)
-
-		p, ok := lyricsManager.LoadLyricsProvider("test-lyrics")
-		Expect(ok).To(BeTrue())
-		provider = p.(*LyricsPlugin)
-	})
-
-	Describe("LoadLyricsProvider", func() {
-		It("returns a lyrics provider for a plugin with Lyrics capability", func() {
-			Expect(provider).ToNot(BeNil())
-		})
-
-		It("returns false for a plugin without Lyrics capability", func() {
-			_, ok := lyricsManager.LoadLyricsProvider("test-metadata-agent")
-			Expect(ok).To(BeFalse())
-		})
-
-		It("returns false for non-existent plugin", func() {
-			_, ok := lyricsManager.LoadLyricsProvider("non-existent")
-			Expect(ok).To(BeFalse())
-		})
-	})
-
-	Describe("GetLyrics", func() {
-		It("successfully returns lyrics from the plugin", func() {
-			track := &model.MediaFile{
-				ID:     "track-1",
-				Title:  "Test Song",
-				Artist: "Test Artist",
-			}
-
-			result, err := provider.GetLyrics(GinkgoT().Context(), track)
-			Expect(err).ToNot(HaveOccurred())
-			Expect(result).To(HaveLen(1))
-			Expect(result[0].Line).ToNot(BeEmpty())
-			Expect(result[0].Line[0].Value).To(ContainSubstring("Test Song"))
-		})
-
-		It("returns error when plugin returns error", func() {
-			manager, _ := createTestManagerWithPlugins(map[string]map[string]string{
-				"test-lyrics": {"error": "service unavailable"},
-			}, "test-lyrics"+PackageExtension)
-
-			p, ok := manager.LoadLyricsProvider("test-lyrics")
-			Expect(ok).To(BeTrue())
-
-			track := &model.MediaFile{ID: "track-1", Title: "Test Song"}
-			_, err := p.GetLyrics(GinkgoT().Context(), track)
-			Expect(err).To(HaveOccurred())
-		})
-	})
-
-	Describe("PluginNames", func() {
-		It("returns plugin names with Lyrics capability", func() {
-			names := lyricsManager.PluginNames("Lyrics")
-			Expect(names).To(ContainElement("test-lyrics"))
-		})
-
-		It("does not return metadata agent plugins for Lyrics capability", func() {
-			names := lyricsManager.PluginNames("Lyrics")
-			Expect(names).ToNot(ContainElement("test-metadata-agent"))
-		})
-	})
-})

plugins/manager.go

@@ -16,7 +16,6 @@ import (
 	extism "github.com/extism/go-sdk"
 	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/core/agents"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/core/scrobbler"
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
@@ -277,22 +276,6 @@ func (m *Manager) LoadScrobbler(name string) (scrobbler.Scrobbler, bool) {
 	}, true
 }
 
-// LoadLyricsProvider loads and returns a lyrics provider plugin by name.
-func (m *Manager) LoadLyricsProvider(name string) (lyrics.Lyrics, bool) {
-	m.mu.RLock()
-	plugin, ok := m.plugins[name]
-	m.mu.RUnlock()
-
-	if !ok || !hasCapability(plugin.capabilities, CapabilityLyrics) {
-		return nil, false
-	}
-
-	return &LyricsPlugin{
-		name:   plugin.name,
-		plugin: plugin,
-	}, true
-}
-
 // PluginInfo contains basic information about a plugin for metrics/insights.
 type PluginInfo struct {
 	Name    string

plugins/manager_loader.go

@@ -128,6 +128,23 @@ var hostServices = []hostServiceEntry{
 			return host.RegisterHTTPHostFunctions(service), nil
 		},
 	},
+	{
+		name:          "Task",
+		hasPermission: func(p *Permissions) bool { return p != nil && p.Taskqueue != nil },
+		create: func(ctx *serviceContext) ([]extism.HostFunction, io.Closer) {
+			perm := ctx.permissions.Taskqueue
+			maxConcurrency := int32(1)
+			if perm.MaxConcurrency > 0 {
+				maxConcurrency = int32(perm.MaxConcurrency)
+			}
+			service, err := newTaskQueueService(ctx.pluginName, ctx.manager, maxConcurrency)
+			if err != nil {
+				log.Error("Failed to create Task service", "plugin", ctx.pluginName, err)
+				return nil, nil
+			}
+			return host.RegisterTaskHostFunctions(service), service
+		},
+	},
 }
 
 // extractManifest reads manifest from an .ndp package and computes its SHA-256 hash.

plugins/manifest-schema.json

@@ -110,6 +110,9 @@
         },
         "users": {
           "$ref": "#/$defs/UsersPermission"
+        },
+        "taskqueue": {
+          "$ref": "#/$defs/TaskQueuePermission"
         }
       }
     },
@@ -224,6 +227,23 @@
         }
       }
     },
+    "TaskQueuePermission": {
+      "type": "object",
+      "description": "Task queue permissions for background task processing",
+      "additionalProperties": false,
+      "properties": {
+        "reason": {
+          "type": "string",
+          "description": "Explanation for why task queue access is needed"
+        },
+        "maxConcurrency": {
+          "type": "integer",
+          "description": "Maximum total concurrent workers across all queues. Default: 1",
+          "minimum": 1,
+          "default": 1
+        }
+      }
+    },
     "UsersPermission": {
       "type": "object",
       "description": "Users service permissions for accessing user information",

plugins/manifest.go

@@ -72,6 +72,13 @@ func ValidateWithCapabilities(m *Manifest, capabilities []Capability) error {
 		}
 	}
 
+	// Task (taskqueue) permission requires TaskWorker capability
+	if m.Permissions != nil && m.Permissions.Taskqueue != nil {
+		if !hasCapability(capabilities, CapabilityTaskWorker) {
+			return fmt.Errorf("'taskqueue' permission requires plugin to export '%s' function", FuncTaskWorkerCallback)
+		}
+	}
+
 	return nil
 }
 

plugins/manifest_gen.go

@@ -181,6 +181,9 @@ type Permissions struct {
 	// Subsonicapi corresponds to the JSON schema field "subsonicapi".
 	Subsonicapi *SubsonicAPIPermission `json:"subsonicapi,omitempty" yaml:"subsonicapi,omitempty" mapstructure:"subsonicapi,omitempty"`
 
+	// Taskqueue corresponds to the JSON schema field "taskqueue".
+	Taskqueue *TaskQueuePermission `json:"taskqueue,omitempty" yaml:"taskqueue,omitempty" mapstructure:"taskqueue,omitempty"`
+
 	// Users corresponds to the JSON schema field "users".
 	Users *UsersPermission `json:"users,omitempty" yaml:"users,omitempty" mapstructure:"users,omitempty"`
 
@@ -200,6 +203,36 @@ type SubsonicAPIPermission struct {
 	Reason *string `json:"reason,omitempty" yaml:"reason,omitempty" mapstructure:"reason,omitempty"`
 }
 
+// Task queue permissions for background task processing
+type TaskQueuePermission struct {
+	// Maximum total concurrent workers across all queues. Default: 1
+	MaxConcurrency int `json:"maxConcurrency,omitempty" yaml:"maxConcurrency,omitempty" mapstructure:"maxConcurrency,omitempty"`
+
+	// Explanation for why task queue access is needed
+	Reason *string `json:"reason,omitempty" yaml:"reason,omitempty" mapstructure:"reason,omitempty"`
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (j *TaskQueuePermission) UnmarshalJSON(value []byte) error {
+	var raw map[string]interface{}
+	if err := json.Unmarshal(value, &raw); err != nil {
+		return err
+	}
+	type Plain TaskQueuePermission
+	var plain Plain
+	if err := json.Unmarshal(value, &plain); err != nil {
+		return err
+	}
+	if v, ok := raw["maxConcurrency"]; !ok || v == nil {
+		plain.MaxConcurrency = 1.0
+	}
+	if 1 > plain.MaxConcurrency {
+		return fmt.Errorf("field %s: must be >= %v", "maxConcurrency", 1)
+	}
+	*j = TaskQueuePermission(plain)
+	return nil
+}
+
 // Enable experimental WebAssembly threads support
 type ThreadsFeature struct {
 	// Explanation for why threads support is needed

plugins/pdk/go/host/doc.go

@@ -43,6 +43,7 @@ The following host services are available:
   - Library: provides access to music library metadata for plugins.
   - Scheduler: provides task scheduling capabilities for plugins.
   - SubsonicAPI: provides access to Navidrome's Subsonic API from plugins.
+  - Task: provides persistent task queues for plugins.
   - Users: provides access to user information for plugins.
   - WebSocket: provides WebSocket communication capabilities for plugins.
 

plugins/pdk/go/host/nd_host_task.go

@@ -0,0 +1,277 @@
+// Code generated by ndpgen. DO NOT EDIT.
+//
+// This file contains client wrappers for the Task host service.
+// It is intended for use in Navidrome plugins built with TinyGo.
+//
+//go:build wasip1
+
+package host
+
+import (
+	"encoding/json"
+	"errors"
+
+	"github.com/navidrome/navidrome/plugins/pdk/go/pdk"
+)
+
+// QueueConfig represents the QueueConfig data structure.
+// QueueConfig holds configuration for a task queue.
+type QueueConfig struct {
+	Concurrency int32 `json:"concurrency"`
+	MaxRetries  int32 `json:"maxRetries"`
+	BackoffMs   int64 `json:"backoffMs"`
+	DelayMs     int64 `json:"delayMs"`
+	RetentionMs int64 `json:"retentionMs"`
+}
+
+// TaskInfo represents the TaskInfo data structure.
+// TaskInfo holds the current state of a task.
+type TaskInfo struct {
+	Status  string `json:"status"`
+	Message string `json:"message"`
+	Attempt int32  `json:"attempt"`
+}
+
+// task_createqueue is the host function provided by Navidrome.
+//
+//go:wasmimport extism:host/user task_createqueue
+func task_createqueue(uint64) uint64
+
+// task_enqueue is the host function provided by Navidrome.
+//
+//go:wasmimport extism:host/user task_enqueue
+func task_enqueue(uint64) uint64
+
+// task_get is the host function provided by Navidrome.
+//
+//go:wasmimport extism:host/user task_get
+func task_get(uint64) uint64
+
+// task_cancel is the host function provided by Navidrome.
+//
+//go:wasmimport extism:host/user task_cancel
+func task_cancel(uint64) uint64
+
+// task_clearqueue is the host function provided by Navidrome.
+//
+//go:wasmimport extism:host/user task_clearqueue
+func task_clearqueue(uint64) uint64
+
+type taskCreateQueueRequest struct {
+	Name   string      `json:"name"`
+	Config QueueConfig `json:"config"`
+}
+
+type taskEnqueueRequest struct {
+	QueueName string `json:"queueName"`
+	Payload   []byte `json:"payload"`
+}
+
+type taskEnqueueResponse struct {
+	Result string `json:"result,omitempty"`
+	Error  string `json:"error,omitempty"`
+}
+
+type taskGetRequest struct {
+	TaskID string `json:"taskId"`
+}
+
+type taskGetResponse struct {
+	Result *TaskInfo `json:"result,omitempty"`
+	Error  string    `json:"error,omitempty"`
+}
+
+type taskCancelRequest struct {
+	TaskID string `json:"taskId"`
+}
+
+type taskClearQueueRequest struct {
+	QueueName string `json:"queueName"`
+}
+
+type taskClearQueueResponse struct {
+	Result int64  `json:"result,omitempty"`
+	Error  string `json:"error,omitempty"`
+}
+
+// TaskCreateQueue calls the task_createqueue host function.
+// CreateQueue creates a named task queue with the given configuration.
+// Zero-value fields in config use sensible defaults.
+// If a queue with the same name already exists, returns an error.
+// On startup, this also recovers any stale "running" tasks from a previous crash.
+func TaskCreateQueue(name string, config QueueConfig) error {
+	// Marshal request to JSON
+	req := taskCreateQueueRequest{
+		Name:   name,
+		Config: config,
+	}
+	reqBytes, err := json.Marshal(req)
+	if err != nil {
+		return err
+	}
+	reqMem := pdk.AllocateBytes(reqBytes)
+	defer reqMem.Free()
+
+	// Call the host function
+	responsePtr := task_createqueue(reqMem.Offset())
+
+	// Read the response from memory
+	responseMem := pdk.FindMemory(responsePtr)
+	responseBytes := responseMem.ReadBytes()
+
+	// Parse error-only response
+	var response struct {
+		Error string `json:"error,omitempty"`
+	}
+	if err := json.Unmarshal(responseBytes, &response); err != nil {
+		return err
+	}
+	if response.Error != "" {
+		return errors.New(response.Error)
+	}
+	return nil
+}
+
+// TaskEnqueue calls the task_enqueue host function.
+// Enqueue adds a task to the named queue. Returns the task ID.
+// payload is opaque bytes passed back to the plugin on execution.
+func TaskEnqueue(queueName string, payload []byte) (string, error) {
+	// Marshal request to JSON
+	req := taskEnqueueRequest{
+		QueueName: queueName,
+		Payload:   payload,
+	}
+	reqBytes, err := json.Marshal(req)
+	if err != nil {
+		return "", err
+	}
+	reqMem := pdk.AllocateBytes(reqBytes)
+	defer reqMem.Free()
+
+	// Call the host function
+	responsePtr := task_enqueue(reqMem.Offset())
+
+	// Read the response from memory
+	responseMem := pdk.FindMemory(responsePtr)
+	responseBytes := responseMem.ReadBytes()
+
+	// Parse the response
+	var response taskEnqueueResponse
+	if err := json.Unmarshal(responseBytes, &response); err != nil {
+		return "", err
+	}
+
+	// Convert Error field to Go error
+	if response.Error != "" {
+		return "", errors.New(response.Error)
+	}
+
+	return response.Result, nil
+}
+
+// TaskGet calls the task_get host function.
+// Get returns the current state of a task including its status,
+// message, and attempt count.
+func TaskGet(taskID string) (*TaskInfo, error) {
+	// Marshal request to JSON
+	req := taskGetRequest{
+		TaskID: taskID,
+	}
+	reqBytes, err := json.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+	reqMem := pdk.AllocateBytes(reqBytes)
+	defer reqMem.Free()
+
+	// Call the host function
+	responsePtr := task_get(reqMem.Offset())
+
+	// Read the response from memory
+	responseMem := pdk.FindMemory(responsePtr)
+	responseBytes := responseMem.ReadBytes()
+
+	// Parse the response
+	var response taskGetResponse
+	if err := json.Unmarshal(responseBytes, &response); err != nil {
+		return nil, err
+	}
+
+	// Convert Error field to Go error
+	if response.Error != "" {
+		return nil, errors.New(response.Error)
+	}
+
+	return response.Result, nil
+}
+
+// TaskCancel calls the task_cancel host function.
+// Cancel cancels a pending task. Returns error if already
+// running, completed, or failed.
+func TaskCancel(taskID string) error {
+	// Marshal request to JSON
+	req := taskCancelRequest{
+		TaskID: taskID,
+	}
+	reqBytes, err := json.Marshal(req)
+	if err != nil {
+		return err
+	}
+	reqMem := pdk.AllocateBytes(reqBytes)
+	defer reqMem.Free()
+
+	// Call the host function
+	responsePtr := task_cancel(reqMem.Offset())
+
+	// Read the response from memory
+	responseMem := pdk.FindMemory(responsePtr)
+	responseBytes := responseMem.ReadBytes()
+
+	// Parse error-only response
+	var response struct {
+		Error string `json:"error,omitempty"`
+	}
+	if err := json.Unmarshal(responseBytes, &response); err != nil {
+		return err
+	}
+	if response.Error != "" {
+		return errors.New(response.Error)
+	}
+	return nil
+}
+
+// TaskClearQueue calls the task_clearqueue host function.
+// ClearQueue removes all pending tasks from the named queue.
+// Running tasks are not affected. Returns the number of tasks removed.
+func TaskClearQueue(queueName string) (int64, error) {
+	// Marshal request to JSON
+	req := taskClearQueueRequest{
+		QueueName: queueName,
+	}
+	reqBytes, err := json.Marshal(req)
+	if err != nil {
+		return 0, err
+	}
+	reqMem := pdk.AllocateBytes(reqBytes)
+	defer reqMem.Free()
+
+	// Call the host function
+	responsePtr := task_clearqueue(reqMem.Offset())
+
+	// Read the response from memory
+	responseMem := pdk.FindMemory(responsePtr)
+	responseBytes := responseMem.ReadBytes()
+
+	// Parse the response
+	var response taskClearQueueResponse
+	if err := json.Unmarshal(responseBytes, &response); err != nil {
+		return 0, err
+	}
+
+	// Convert Error field to Go error
+	if response.Error != "" {
+		return 0, errors.New(response.Error)
+	}
+
+	return response.Result, nil
+}

plugins/pdk/go/host/nd_host_task_stub.go

@@ -0,0 +1,92 @@
+// Code generated by ndpgen. DO NOT EDIT.
+//
+// This file contains mock implementations for non-WASM builds.
+// These mocks allow IDE support, compilation, and unit testing on non-WASM platforms.
+// Plugin authors can use the exported mock instances to set expectations in tests.
+//
+//go:build !wasip1
+
+package host
+
+import "github.com/stretchr/testify/mock"
+
+// QueueConfig represents the QueueConfig data structure.
+// QueueConfig holds configuration for a task queue.
+type QueueConfig struct {
+	Concurrency int32 `json:"concurrency"`
+	MaxRetries  int32 `json:"maxRetries"`
+	BackoffMs   int64 `json:"backoffMs"`
+	DelayMs     int64 `json:"delayMs"`
+	RetentionMs int64 `json:"retentionMs"`
+}
+
+// TaskInfo represents the TaskInfo data structure.
+// TaskInfo holds the current state of a task.
+type TaskInfo struct {
+	Status  string `json:"status"`
+	Message string `json:"message"`
+	Attempt int32  `json:"attempt"`
+}
+
+// mockTaskService is the mock implementation for testing.
+type mockTaskService struct {
+	mock.Mock
+}
+
+// TaskMock is the auto-instantiated mock instance for testing.
+// Use this to set expectations: host.TaskMock.On("MethodName", args...).Return(values...)
+var TaskMock = &mockTaskService{}
+
+// CreateQueue is the mock method for TaskCreateQueue.
+func (m *mockTaskService) CreateQueue(name string, config QueueConfig) error {
+	args := m.Called(name, config)
+	return args.Error(0)
+}
+
+// TaskCreateQueue delegates to the mock instance.
+// CreateQueue creates a named task queue with the given configuration.
+// Zero-value fields in config use sensible defaults.
+// If a queue with the same name already exists, returns an error.
+// On startup, this also recovers any stale "running" tasks from a previous crash.
+func TaskCreateQueue(name string, config QueueConfig) error {
+	return TaskMock.CreateQueue(name, config)
+}
+
+// Enqueue is the mock method for TaskEnqueue.
+func (m *mockTaskService) Enqueue(queueName string, payload []byte) (string, error) {
+	args := m.Called(queueName, payload)
+	return args.String(0), args.Error(1)
+}
+
+// TaskEnqueue delegates to the mock instance.
+// Enqueue adds a task to the named queue. Returns the task ID.
+// payload is opaque bytes passed back to the plugin on execution.
+func TaskEnqueue(queueName string, payload []byte) (string, error) {
+	return TaskMock.Enqueue(queueName, payload)
+}
+
+// Get is the mock method for TaskGet.
+func (m *mockTaskService) Get(taskID string) (*TaskInfo, error) {
+	args := m.Called(taskID)
+	return args.Get(0).(*TaskInfo), args.Error(1)
+}
+
+// TaskGet delegates to the mock instance.
+// Get returns the current state of a task including its status,
+// message, and attempt count.
+func TaskGet(taskID string) (*TaskInfo, error) {
+	return TaskMock.Get(taskID)
+}
+
+// Cancel is the mock method for TaskCancel.
+func (m *mockTaskService) Cancel(taskID string) error {
+	args := m.Called(taskID)
+	return args.Error(0)
+}
+
+// TaskCancel delegates to the mock instance.
+// Cancel cancels a pending task. Returns error if already
+// running, completed, or failed.
+func TaskCancel(taskID string) error {
+	return TaskMock.Cancel(taskID)
+}

plugins/pdk/go/lyrics/lyrics.go

@@ -1,118 +0,0 @@
-// Code generated by ndpgen. DO NOT EDIT.
-//
-// This file contains export wrappers for the Lyrics capability.
-// It is intended for use in Navidrome plugins built with TinyGo.
-//
-//go:build wasip1
-
-package lyrics
-
-import (
-	"github.com/navidrome/navidrome/plugins/pdk/go/pdk"
-)
-
-// ArtistRef is a reference to an artist with name and optional MBID.
-type ArtistRef struct {
-	// ID is the internal Navidrome artist ID (if known).
-	ID string `json:"id,omitempty"`
-	// Name is the artist name.
-	Name string `json:"name"`
-	// MBID is the MusicBrainz ID for the artist.
-	MBID string `json:"mbid,omitempty"`
-}
-
-// GetLyricsRequest contains the track information for lyrics lookup.
-type GetLyricsRequest struct {
-	Track TrackInfo `json:"track"`
-}
-
-// GetLyricsResponse contains the lyrics returned by the plugin.
-type GetLyricsResponse struct {
-	Lyrics []LyricsText `json:"lyrics"`
-}
-
-// LyricsText represents a single set of lyrics in raw text format.
-// Text can be plain text or LRC format — Navidrome will parse it.
-type LyricsText struct {
-	Lang string `json:"lang,omitempty"`
-	Text string `json:"text"`
-}
-
-// TrackInfo contains track metadata for scrobbling.
-type TrackInfo struct {
-	// ID is the internal Navidrome track ID.
-	ID string `json:"id"`
-	// Title is the track title.
-	Title string `json:"title"`
-	// Album is the album name.
-	Album string `json:"album"`
-	// Artist is the formatted artist name for display (e.g., "Artist1 • Artist2").
-	Artist string `json:"artist"`
-	// AlbumArtist is the formatted album artist name for display.
-	AlbumArtist string `json:"albumArtist"`
-	// Artists is the list of track artists.
-	Artists []ArtistRef `json:"artists"`
-	// AlbumArtists is the list of album artists.
-	AlbumArtists []ArtistRef `json:"albumArtists"`
-	// Duration is the track duration in seconds.
-	Duration float32 `json:"duration"`
-	// TrackNumber is the track number on the album.
-	TrackNumber int32 `json:"trackNumber"`
-	// DiscNumber is the disc number.
-	DiscNumber int32 `json:"discNumber"`
-	// MBZRecordingID is the MusicBrainz recording ID.
-	MBZRecordingID string `json:"mbzRecordingId,omitempty"`
-	// MBZAlbumID is the MusicBrainz album/release ID.
-	MBZAlbumID string `json:"mbzAlbumId,omitempty"`
-	// MBZReleaseGroupID is the MusicBrainz release group ID.
-	MBZReleaseGroupID string `json:"mbzReleaseGroupId,omitempty"`
-	// MBZReleaseTrackID is the MusicBrainz release track ID.
-	MBZReleaseTrackID string `json:"mbzReleaseTrackId,omitempty"`
-}
-
-// Lyrics requires all methods to be implemented.
-// Lyrics provides lyrics for a given track from external sources.
-type Lyrics interface {
-	// GetLyrics
-	GetLyrics(GetLyricsRequest) (GetLyricsResponse, error)
-} // Internal implementation holders
-var (
-	lyricsImpl func(GetLyricsRequest) (GetLyricsResponse, error)
-)
-
-// Register registers a lyrics implementation.
-// All methods are required.
-func Register(impl Lyrics) {
-	lyricsImpl = impl.GetLyrics
-}
-
-// NotImplementedCode is the standard return code for unimplemented functions.
-// The host recognizes this and skips the plugin gracefully.
-const NotImplementedCode int32 = -2
-
-//go:wasmexport nd_lyrics_get_lyrics
-func _NdLyricsGetLyrics() int32 {
-	if lyricsImpl == nil {
-		// Return standard code - host will skip this plugin gracefully
-		return NotImplementedCode
-	}
-
-	var input GetLyricsRequest
-	if err := pdk.InputJSON(&input); err != nil {
-		pdk.SetError(err)
-		return -1
-	}
-
-	output, err := lyricsImpl(input)
-	if err != nil {
-		pdk.SetError(err)
-		return -1
-	}
-
-	if err := pdk.OutputJSON(output); err != nil {
-		pdk.SetError(err)
-		return -1
-	}
-
-	return 0
-}

plugins/pdk/go/lyrics/lyrics_stub.go

@@ -1,82 +0,0 @@
-// Code generated by ndpgen. DO NOT EDIT.
-//
-// This file provides stub implementations for non-WASM platforms.
-// It allows Go plugins to compile and run tests outside of WASM,
-// but the actual functionality is only available in WASM builds.
-//
-//go:build !wasip1
-
-package lyrics
-
-// ArtistRef is a reference to an artist with name and optional MBID.
-type ArtistRef struct {
-	// ID is the internal Navidrome artist ID (if known).
-	ID string `json:"id,omitempty"`
-	// Name is the artist name.
-	Name string `json:"name"`
-	// MBID is the MusicBrainz ID for the artist.
-	MBID string `json:"mbid,omitempty"`
-}
-
-// GetLyricsRequest contains the track information for lyrics lookup.
-type GetLyricsRequest struct {
-	Track TrackInfo `json:"track"`
-}
-
-// GetLyricsResponse contains the lyrics returned by the plugin.
-type GetLyricsResponse struct {
-	Lyrics []LyricsText `json:"lyrics"`
-}
-
-// LyricsText represents a single set of lyrics in raw text format.
-// Text can be plain text or LRC format — Navidrome will parse it.
-type LyricsText struct {
-	Lang string `json:"lang,omitempty"`
-	Text string `json:"text"`
-}
-
-// TrackInfo contains track metadata for scrobbling.
-type TrackInfo struct {
-	// ID is the internal Navidrome track ID.
-	ID string `json:"id"`
-	// Title is the track title.
-	Title string `json:"title"`
-	// Album is the album name.
-	Album string `json:"album"`
-	// Artist is the formatted artist name for display (e.g., "Artist1 • Artist2").
-	Artist string `json:"artist"`
-	// AlbumArtist is the formatted album artist name for display.
-	AlbumArtist string `json:"albumArtist"`
-	// Artists is the list of track artists.
-	Artists []ArtistRef `json:"artists"`
-	// AlbumArtists is the list of album artists.
-	AlbumArtists []ArtistRef `json:"albumArtists"`
-	// Duration is the track duration in seconds.
-	Duration float32 `json:"duration"`
-	// TrackNumber is the track number on the album.
-	TrackNumber int32 `json:"trackNumber"`
-	// DiscNumber is the disc number.
-	DiscNumber int32 `json:"discNumber"`
-	// MBZRecordingID is the MusicBrainz recording ID.
-	MBZRecordingID string `json:"mbzRecordingId,omitempty"`
-	// MBZAlbumID is the MusicBrainz album/release ID.
-	MBZAlbumID string `json:"mbzAlbumId,omitempty"`
-	// MBZReleaseGroupID is the MusicBrainz release group ID.
-	MBZReleaseGroupID string `json:"mbzReleaseGroupId,omitempty"`
-	// MBZReleaseTrackID is the MusicBrainz release track ID.
-	MBZReleaseTrackID string `json:"mbzReleaseTrackId,omitempty"`
-}
-
-// Lyrics requires all methods to be implemented.
-// Lyrics provides lyrics for a given track from external sources.
-type Lyrics interface {
-	// GetLyrics
-	GetLyrics(GetLyricsRequest) (GetLyricsResponse, error)
-}
-
-// NotImplementedCode is the standard return code for unimplemented functions.
-const NotImplementedCode int32 = -2
-
-// Register is a no-op on non-WASM platforms.
-// This stub allows code to compile outside of WASM.
-func Register(_ Lyrics) {}

plugins/pdk/go/taskworker/taskworker.go

@@ -0,0 +1,79 @@
+// Code generated by ndpgen. DO NOT EDIT.
+//
+// This file contains export wrappers for the TaskWorker capability.
+// It is intended for use in Navidrome plugins built with TinyGo.
+//
+//go:build wasip1
+
+package taskworker
+
+import (
+	"github.com/navidrome/navidrome/plugins/pdk/go/pdk"
+)
+
+// TaskExecuteRequest is the request provided when a task is ready to execute.
+type TaskExecuteRequest struct {
+	// QueueName is the name of the queue this task belongs to.
+	QueueName string `json:"queueName"`
+	// TaskID is the unique identifier for this task.
+	TaskID string `json:"taskId"`
+	// Payload is the opaque data provided when the task was enqueued.
+	Payload []byte `json:"payload"`
+	// Attempt is the current attempt number (1-based: first attempt = 1).
+	Attempt int32 `json:"attempt"`
+}
+
+// TaskWorker is the marker interface for taskworker plugins.
+// Implement one or more of the provider interfaces below.
+// TaskWorker provides task execution handling.
+// This capability allows plugins to receive callbacks when their queued tasks
+// are ready to execute. Plugins that use the taskqueue host service must
+// implement this capability.
+type TaskWorker interface{}
+
+// TaskExecuteProvider provides the OnTaskExecute function.
+type TaskExecuteProvider interface {
+	OnTaskExecute(TaskExecuteRequest) (string, error)
+} // Internal implementation holders
+var (
+	taskExecuteImpl func(TaskExecuteRequest) (string, error)
+)
+
+// Register registers a taskworker implementation.
+// The implementation is checked for optional provider interfaces.
+func Register(impl TaskWorker) {
+	if p, ok := impl.(TaskExecuteProvider); ok {
+		taskExecuteImpl = p.OnTaskExecute
+	}
+}
+
+// NotImplementedCode is the standard return code for unimplemented functions.
+// The host recognizes this and skips the plugin gracefully.
+const NotImplementedCode int32 = -2
+
+//go:wasmexport nd_task_execute
+func _NdTaskExecute() int32 {
+	if taskExecuteImpl == nil {
+		// Return standard code - host will skip this plugin gracefully
+		return NotImplementedCode
+	}
+
+	var input TaskExecuteRequest
+	if err := pdk.InputJSON(&input); err != nil {
+		pdk.SetError(err)
+		return -1
+	}
+
+	output, err := taskExecuteImpl(input)
+	if err != nil {
+		pdk.SetError(err)
+		return -1
+	}
+
+	if err := pdk.OutputJSON(output); err != nil {
+		pdk.SetError(err)
+		return -1
+	}
+
+	return 0
+}

plugins/pdk/go/taskworker/taskworker_stub.go

@@ -0,0 +1,41 @@
+// Code generated by ndpgen. DO NOT EDIT.
+//
+// This file provides stub implementations for non-WASM platforms.
+// It allows Go plugins to compile and run tests outside of WASM,
+// but the actual functionality is only available in WASM builds.
+//
+//go:build !wasip1
+
+package taskworker
+
+// TaskExecuteRequest is the request provided when a task is ready to execute.
+type TaskExecuteRequest struct {
+	// QueueName is the name of the queue this task belongs to.
+	QueueName string `json:"queueName"`
+	// TaskID is the unique identifier for this task.
+	TaskID string `json:"taskId"`
+	// Payload is the opaque data provided when the task was enqueued.
+	Payload []byte `json:"payload"`
+	// Attempt is the current attempt number (1-based: first attempt = 1).
+	Attempt int32 `json:"attempt"`
+}
+
+// TaskWorker is the marker interface for taskworker plugins.
+// Implement one or more of the provider interfaces below.
+// TaskWorker provides task execution handling.
+// This capability allows plugins to receive callbacks when their queued tasks
+// are ready to execute. Plugins that use the taskqueue host service must
+// implement this capability.
+type TaskWorker interface{}
+
+// TaskExecuteProvider provides the OnTaskExecute function.
+type TaskExecuteProvider interface {
+	OnTaskExecute(TaskExecuteRequest) (string, error)
+}
+
+// NotImplementedCode is the standard return code for unimplemented functions.
+const NotImplementedCode int32 = -2
+
+// Register is a no-op on non-WASM platforms.
+// This stub allows code to compile outside of WASM.
+func Register(_ TaskWorker) {}

plugins/pdk/python/host/nd_host_task.py

@@ -0,0 +1,187 @@
+# Code generated by ndpgen. DO NOT EDIT.
+#
+# This file contains client wrappers for the Task host service.
+# It is intended for use in Navidrome plugins built with extism-py.
+#
+# IMPORTANT: Due to a limitation in extism-py, you cannot import this file directly.
+# The @extism.import_fn decorators are only detected when defined in the plugin's
+# main __init__.py file. Copy the needed functions from this file into your plugin.
+
+from dataclasses import dataclass
+from typing import Any
+
+import extism
+import json
+import base64
+
+
+class HostFunctionError(Exception):
+    """Raised when a host function returns an error."""
+    pass
+
+
+@extism.import_fn("extism:host/user", "task_createqueue")
+def _task_createqueue(offset: int) -> int:
+    """Raw host function - do not call directly."""
+    ...
+
+
+@extism.import_fn("extism:host/user", "task_enqueue")
+def _task_enqueue(offset: int) -> int:
+    """Raw host function - do not call directly."""
+    ...
+
+
+@extism.import_fn("extism:host/user", "task_get")
+def _task_get(offset: int) -> int:
+    """Raw host function - do not call directly."""
+    ...
+
+
+@extism.import_fn("extism:host/user", "task_cancel")
+def _task_cancel(offset: int) -> int:
+    """Raw host function - do not call directly."""
+    ...
+
+
+@extism.import_fn("extism:host/user", "task_clearqueue")
+def _task_clearqueue(offset: int) -> int:
+    """Raw host function - do not call directly."""
+    ...
+
+
+def task_create_queue(name: str, config: Any) -> None:
+    """CreateQueue creates a named task queue with the given configuration.
+Zero-value fields in config use sensible defaults.
+If a queue with the same name already exists, returns an error.
+On startup, this also recovers any stale "running" tasks from a previous crash.
+
+    Args:
+        name: str parameter.
+        config: Any parameter.
+
+    Raises:
+        HostFunctionError: If the host function returns an error.
+    """
+    request = {
+        "name": name,
+        "config": config,
+    }
+    request_bytes = json.dumps(request).encode("utf-8")
+    request_mem = extism.memory.alloc(request_bytes)
+    response_offset = _task_createqueue(request_mem.offset)
+    response_mem = extism.memory.find(response_offset)
+    response = json.loads(extism.memory.string(response_mem))
+
+    if response.get("error"):
+        raise HostFunctionError(response["error"])
+
+
+
+def task_enqueue(queue_name: str, payload: bytes) -> str:
+    """Enqueue adds a task to the named queue. Returns the task ID.
+payload is opaque bytes passed back to the plugin on execution.
+
+    Args:
+        queue_name: str parameter.
+        payload: bytes parameter.
+
+    Returns:
+        str: The result value.
+
+    Raises:
+        HostFunctionError: If the host function returns an error.
+    """
+    request = {
+        "queueName": queue_name,
+        "payload": base64.b64encode(payload).decode("ascii"),
+    }
+    request_bytes = json.dumps(request).encode("utf-8")
+    request_mem = extism.memory.alloc(request_bytes)
+    response_offset = _task_enqueue(request_mem.offset)
+    response_mem = extism.memory.find(response_offset)
+    response = json.loads(extism.memory.string(response_mem))
+
+    if response.get("error"):
+        raise HostFunctionError(response["error"])
+
+    return response.get("result", "")
+
+
+def task_get(task_id: str) -> Any:
+    """Get returns the current state of a task including its status,
+message, and attempt count.
+
+    Args:
+        task_id: str parameter.
+
+    Returns:
+        Any: The result value.
+
+    Raises:
+        HostFunctionError: If the host function returns an error.
+    """
+    request = {
+        "taskId": task_id,
+    }
+    request_bytes = json.dumps(request).encode("utf-8")
+    request_mem = extism.memory.alloc(request_bytes)
+    response_offset = _task_get(request_mem.offset)
+    response_mem = extism.memory.find(response_offset)
+    response = json.loads(extism.memory.string(response_mem))
+
+    if response.get("error"):
+        raise HostFunctionError(response["error"])
+
+    return response.get("result", None)
+
+
+def task_cancel(task_id: str) -> None:
+    """Cancel cancels a pending task. Returns error if already
+running, completed, or failed.
+
+    Args:
+        task_id: str parameter.
+
+    Raises:
+        HostFunctionError: If the host function returns an error.
+    """
+    request = {
+        "taskId": task_id,
+    }
+    request_bytes = json.dumps(request).encode("utf-8")
+    request_mem = extism.memory.alloc(request_bytes)
+    response_offset = _task_cancel(request_mem.offset)
+    response_mem = extism.memory.find(response_offset)
+    response = json.loads(extism.memory.string(response_mem))
+
+    if response.get("error"):
+        raise HostFunctionError(response["error"])
+
+
+def task_clear_queue(queue_name: str) -> int:
+    """ClearQueue removes all pending tasks from the named queue.
+Running tasks are not affected. Returns the number of tasks removed.
+
+    Args:
+        queue_name: str parameter.
+
+    Returns:
+        int: The number of tasks removed.
+
+    Raises:
+        HostFunctionError: If the host function returns an error.
+    """
+    request = {
+        "queueName": queue_name,
+    }
+    request_bytes = json.dumps(request).encode("utf-8")
+    request_mem = extism.memory.alloc(request_bytes)
+    response_offset = _task_clearqueue(request_mem.offset)
+    response_mem = extism.memory.find(response_offset)
+    response = json.loads(extism.memory.string(response_mem))
+
+    if response.get("error"):
+        raise HostFunctionError(response["error"])
+
+    return response.get("result", 0)

plugins/pdk/rust/nd-pdk-capabilities/src/lib.rs

@@ -6,8 +6,8 @@
 //! for implementing Navidrome plugin capabilities in Rust.
 
 pub mod lifecycle;
-pub mod lyrics;
 pub mod metadata;
 pub mod scheduler;
 pub mod scrobbler;
+pub mod taskworker;
 pub mod websocket;

plugins/pdk/rust/nd-pdk-capabilities/src/lyrics.rs

@@ -1,148 +0,0 @@
-// Code generated by ndpgen. DO NOT EDIT.
-//
-// This file contains export wrappers for the Lyrics capability.
-// It is intended for use in Navidrome plugins built with extism-pdk.
-
-use serde::{Deserialize, Serialize};
-
-// Helper functions for skip_serializing_if with numeric types
-#[allow(dead_code)]
-fn is_zero_i32(value: &i32) -> bool { *value == 0 }
-#[allow(dead_code)]
-fn is_zero_u32(value: &u32) -> bool { *value == 0 }
-#[allow(dead_code)]
-fn is_zero_i64(value: &i64) -> bool { *value == 0 }
-#[allow(dead_code)]
-fn is_zero_u64(value: &u64) -> bool { *value == 0 }
-#[allow(dead_code)]
-fn is_zero_f32(value: &f32) -> bool { *value == 0.0 }
-#[allow(dead_code)]
-fn is_zero_f64(value: &f64) -> bool { *value == 0.0 }
-/// ArtistRef is a reference to an artist with name and optional MBID.
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct ArtistRef {
-    /// ID is the internal Navidrome artist ID (if known).
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub id: String,
-    /// Name is the artist name.
-    #[serde(default)]
-    pub name: String,
-    /// MBID is the MusicBrainz ID for the artist.
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub mbid: String,
-}
-/// GetLyricsRequest contains the track information for lyrics lookup.
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct GetLyricsRequest {
-    #[serde(default)]
-    pub track: TrackInfo,
-}
-/// GetLyricsResponse contains the lyrics returned by the plugin.
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct GetLyricsResponse {
-    #[serde(default)]
-    pub lyrics: Vec<LyricsText>,
-}
-/// LyricsText represents a single set of lyrics in raw text format.
-/// Text can be plain text or LRC format — Navidrome will parse it.
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct LyricsText {
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub lang: String,
-    #[serde(default)]
-    pub text: String,
-}
-/// TrackInfo contains track metadata for scrobbling.
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct TrackInfo {
-    /// ID is the internal Navidrome track ID.
-    #[serde(default)]
-    pub id: String,
-    /// Title is the track title.
-    #[serde(default)]
-    pub title: String,
-    /// Album is the album name.
-    #[serde(default)]
-    pub album: String,
-    /// Artist is the formatted artist name for display (e.g., "Artist1 • Artist2").
-    #[serde(default)]
-    pub artist: String,
-    /// AlbumArtist is the formatted album artist name for display.
-    #[serde(default)]
-    pub album_artist: String,
-    /// Artists is the list of track artists.
-    #[serde(default)]
-    pub artists: Vec<ArtistRef>,
-    /// AlbumArtists is the list of album artists.
-    #[serde(default)]
-    pub album_artists: Vec<ArtistRef>,
-    /// Duration is the track duration in seconds.
-    #[serde(default)]
-    pub duration: f32,
-    /// TrackNumber is the track number on the album.
-    #[serde(default)]
-    pub track_number: i32,
-    /// DiscNumber is the disc number.
-    #[serde(default)]
-    pub disc_number: i32,
-    /// MBZRecordingID is the MusicBrainz recording ID.
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub mbz_recording_id: String,
-    /// MBZAlbumID is the MusicBrainz album/release ID.
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub mbz_album_id: String,
-    /// MBZReleaseGroupID is the MusicBrainz release group ID.
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub mbz_release_group_id: String,
-    /// MBZReleaseTrackID is the MusicBrainz release track ID.
-    #[serde(default, skip_serializing_if = "String::is_empty")]
-    pub mbz_release_track_id: String,
-}
-
-/// Error represents an error from a capability method.
-#[derive(Debug)]
-pub struct Error {
-    pub message: String,
-}
-
-impl std::fmt::Display for Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self.message)
-    }
-}
-
-impl std::error::Error for Error {}
-
-impl Error {
-    pub fn new(message: impl Into<String>) -> Self {
-        Self { message: message.into() }
-    }
-}
-
-/// Lyrics requires all methods to be implemented.
-/// Lyrics provides lyrics for a given track from external sources.
-pub trait Lyrics {
-    /// GetLyrics
-    fn get_lyrics(&self, req: GetLyricsRequest) -> Result<GetLyricsResponse, Error>;
-}
-
-/// Register all exports for the Lyrics capability.
-/// This macro generates the WASM export functions for all trait methods.
-#[macro_export]
-macro_rules! register_lyrics {
-    ($plugin_type:ty) => {
-        #[extism_pdk::plugin_fn]
-        pub fn nd_lyrics_get_lyrics(
-            req: extism_pdk::Json<$crate::lyrics::GetLyricsRequest>
-        ) -> extism_pdk::FnResult<extism_pdk::Json<$crate::lyrics::GetLyricsResponse>> {
-            let plugin = <$plugin_type>::default();
-            let result = $crate::lyrics::Lyrics::get_lyrics(&plugin, req.into_inner())?;
-            Ok(extism_pdk::Json(result))
-        }
-    };
-}

plugins/pdk/rust/nd-pdk-capabilities/src/taskworker.rs

@@ -0,0 +1,102 @@
+// Code generated by ndpgen. DO NOT EDIT.
+//
+// This file contains export wrappers for the TaskWorker capability.
+// It is intended for use in Navidrome plugins built with extism-pdk.
+
+use serde::{Deserialize, Serialize};
+use base64::Engine as _;
+use base64::engine::general_purpose::STANDARD as BASE64;
+
+mod base64_bytes {
+    use serde::{self, Deserialize, Deserializer, Serializer};
+    use base64::Engine as _;
+    use base64::engine::general_purpose::STANDARD as BASE64;
+
+    pub fn serialize<S>(bytes: &Vec<u8>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(&BASE64.encode(bytes))
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<Vec<u8>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        BASE64.decode(&s).map_err(serde::de::Error::custom)
+    }
+}
+
+// Helper functions for skip_serializing_if with numeric types
+#[allow(dead_code)]
+fn is_zero_i32(value: &i32) -> bool { *value == 0 }
+#[allow(dead_code)]
+fn is_zero_u32(value: &u32) -> bool { *value == 0 }
+#[allow(dead_code)]
+fn is_zero_i64(value: &i64) -> bool { *value == 0 }
+#[allow(dead_code)]
+fn is_zero_u64(value: &u64) -> bool { *value == 0 }
+#[allow(dead_code)]
+fn is_zero_f32(value: &f32) -> bool { *value == 0.0 }
+#[allow(dead_code)]
+fn is_zero_f64(value: &f64) -> bool { *value == 0.0 }
+/// TaskExecuteRequest is the request provided when a task is ready to execute.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TaskExecuteRequest {
+    /// QueueName is the name of the queue this task belongs to.
+    #[serde(default)]
+    pub queue_name: String,
+    /// TaskID is the unique identifier for this task.
+    #[serde(default)]
+    pub task_id: String,
+    /// Payload is the opaque data provided when the task was enqueued.
+    #[serde(default)]
+    #[serde(with = "base64_bytes")]
+    pub payload: Vec<u8>,
+    /// Attempt is the current attempt number (1-based: first attempt = 1).
+    #[serde(default)]
+    pub attempt: i32,
+}
+
+/// Error represents an error from a capability method.
+#[derive(Debug)]
+pub struct Error {
+    pub message: String,
+}
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.message)
+    }
+}
+
+impl std::error::Error for Error {}
+
+impl Error {
+    pub fn new(message: impl Into<String>) -> Self {
+        Self { message: message.into() }
+    }
+}
+
+/// TaskExecuteProvider provides the OnTaskExecute function.
+pub trait TaskExecuteProvider {
+    fn on_task_execute(&self, req: TaskExecuteRequest) -> Result<String, Error>;
+}
+
+/// Register the on_task_execute export.
+/// This macro generates the WASM export function for this method.
+#[macro_export]
+macro_rules! register_taskworker_task_execute {
+    ($plugin_type:ty) => {
+        #[extism_pdk::plugin_fn]
+        pub fn nd_task_execute(
+            req: extism_pdk::Json<$crate::taskworker::TaskExecuteRequest>
+        ) -> extism_pdk::FnResult<extism_pdk::Json<String>> {
+            let plugin = <$plugin_type>::default();
+            let result = $crate::taskworker::TaskExecuteProvider::on_task_execute(&plugin, req.into_inner())?;
+            Ok(extism_pdk::Json(result))
+        }
+    };
+}

plugins/pdk/rust/nd-pdk-host/src/lib.rs

@@ -40,6 +40,7 @@
 //! - [`library`] - provides access to music library metadata for plugins.
 //! - [`scheduler`] - provides task scheduling capabilities for plugins.
 //! - [`subsonicapi`] - provides access to Navidrome's Subsonic API from plugins.
+//! - [`task`] - provides persistent task queues for plugins.
 //! - [`users`] - provides access to user information for plugins.
 //! - [`websocket`] - provides WebSocket communication capabilities for plugins.
 
@@ -99,6 +100,13 @@ pub mod subsonicapi {
     pub use super::nd_host_subsonicapi::*;
 }
 
+#[doc(hidden)]
+mod nd_host_task;
+/// provides persistent task queues for plugins.
+pub mod task {
+    pub use super::nd_host_task::*;
+}
+
 #[doc(hidden)]
 mod nd_host_users;
 /// provides access to user information for plugins.

plugins/pdk/rust/nd-pdk-host/src/nd_host_task.rs

@@ -0,0 +1,258 @@
+// Code generated by ndpgen. DO NOT EDIT.
+//
+// This file contains client wrappers for the Task host service.
+// It is intended for use in Navidrome plugins built with extism-pdk.
+
+use extism_pdk::*;
+use serde::{Deserialize, Serialize};
+use base64::Engine as _;
+use base64::engine::general_purpose::STANDARD as BASE64;
+
+mod base64_bytes {
+    use serde::{self, Deserialize, Deserializer, Serializer};
+    use base64::Engine as _;
+    use base64::engine::general_purpose::STANDARD as BASE64;
+
+    pub fn serialize<S>(bytes: &Vec<u8>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(&BASE64.encode(bytes))
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<Vec<u8>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        BASE64.decode(&s).map_err(serde::de::Error::custom)
+    }
+}
+
+/// QueueConfig holds configuration for a task queue.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct QueueConfig {
+    pub concurrency: i32,
+    pub max_retries: i32,
+    pub backoff_ms: i64,
+    pub delay_ms: i64,
+    pub retention_ms: i64,
+}
+
+/// TaskInfo holds the current state of a task.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TaskInfo {
+    pub status: String,
+    pub message: String,
+    pub attempt: i32,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskCreateQueueRequest {
+    name: String,
+    config: QueueConfig,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskCreateQueueResponse {
+    #[serde(default)]
+    error: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskEnqueueRequest {
+    queue_name: String,
+    #[serde(with = "base64_bytes")]
+    payload: Vec<u8>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskEnqueueResponse {
+    #[serde(default)]
+    result: String,
+    #[serde(default)]
+    error: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskGetRequest {
+    task_id: String,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskGetResponse {
+    #[serde(default)]
+    result: Option<TaskInfo>,
+    #[serde(default)]
+    error: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskCancelRequest {
+    task_id: String,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskCancelResponse {
+    #[serde(default)]
+    error: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskClearQueueRequest {
+    queue_name: String,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct TaskClearQueueResponse {
+    #[serde(default)]
+    result: i64,
+    #[serde(default)]
+    error: Option<String>,
+}
+
+#[host_fn]
+extern "ExtismHost" {
+    fn task_createqueue(input: Json<TaskCreateQueueRequest>) -> Json<TaskCreateQueueResponse>;
+    fn task_enqueue(input: Json<TaskEnqueueRequest>) -> Json<TaskEnqueueResponse>;
+    fn task_get(input: Json<TaskGetRequest>) -> Json<TaskGetResponse>;
+    fn task_cancel(input: Json<TaskCancelRequest>) -> Json<TaskCancelResponse>;
+    fn task_clearqueue(input: Json<TaskClearQueueRequest>) -> Json<TaskClearQueueResponse>;
+}
+
+/// CreateQueue creates a named task queue with the given configuration.
+/// Zero-value fields in config use sensible defaults.
+/// If a queue with the same name already exists, returns an error.
+/// On startup, this also recovers any stale "running" tasks from a previous crash.
+///
+/// # Arguments
+/// * `name` - String parameter.
+/// * `config` - QueueConfig parameter.
+///
+/// # Errors
+/// Returns an error if the host function call fails.
+pub fn create_queue(name: &str, config: QueueConfig) -> Result<(), Error> {
+    let response = unsafe {
+        task_createqueue(Json(TaskCreateQueueRequest {
+            name: name.to_owned(),
+            config: config,
+        }))?
+    };
+
+    if let Some(err) = response.0.error {
+        return Err(Error::msg(err));
+    }
+
+    Ok(())
+}
+
+/// Enqueue adds a task to the named queue. Returns the task ID.
+/// payload is opaque bytes passed back to the plugin on execution.
+///
+/// # Arguments
+/// * `queue_name` - String parameter.
+/// * `payload` - Vec<u8> parameter.
+///
+/// # Returns
+/// The result value.
+///
+/// # Errors
+/// Returns an error if the host function call fails.
+pub fn enqueue(queue_name: &str, payload: Vec<u8>) -> Result<String, Error> {
+    let response = unsafe {
+        task_enqueue(Json(TaskEnqueueRequest {
+            queue_name: queue_name.to_owned(),
+            payload: payload,
+        }))?
+    };
+
+    if let Some(err) = response.0.error {
+        return Err(Error::msg(err));
+    }
+
+    Ok(response.0.result)
+}
+
+/// Get returns the current state of a task including its status,
+/// message, and attempt count.
+///
+/// # Arguments
+/// * `task_id` - String parameter.
+///
+/// # Returns
+/// The result value.
+///
+/// # Errors
+/// Returns an error if the host function call fails.
+pub fn get(task_id: &str) -> Result<Option<TaskInfo>, Error> {
+    let response = unsafe {
+        task_get(Json(TaskGetRequest {
+            task_id: task_id.to_owned(),
+        }))?
+    };
+
+    if let Some(err) = response.0.error {
+        return Err(Error::msg(err));
+    }
+
+    Ok(response.0.result)
+}
+
+/// Cancel cancels a pending task. Returns error if already
+/// running, completed, or failed.
+///
+/// # Arguments
+/// * `task_id` - String parameter.
+///
+/// # Errors
+/// Returns an error if the host function call fails.
+pub fn cancel(task_id: &str) -> Result<(), Error> {
+    let response = unsafe {
+        task_cancel(Json(TaskCancelRequest {
+            task_id: task_id.to_owned(),
+        }))?
+    };
+
+    if let Some(err) = response.0.error {
+        return Err(Error::msg(err));
+    }
+
+    Ok(())
+}
+
+/// ClearQueue removes all pending tasks from the named queue.
+/// Running tasks are not affected. Returns the number of tasks removed.
+///
+/// # Arguments
+/// * `queue_name` - String parameter.
+///
+/// # Returns
+/// The number of tasks removed.
+///
+/// # Errors
+/// Returns an error if the host function call fails.
+pub fn clear_queue(queue_name: &str) -> Result<i64, Error> {
+    let response = unsafe {
+        task_clearqueue(Json(TaskClearQueueRequest {
+            queue_name: queue_name.to_owned(),
+        }))?
+    };
+
+    if let Some(err) = response.0.error {
+        return Err(Error::msg(err));
+    }
+
+    Ok(response.0.result)
+}

plugins/testdata/test-lyrics/main.go

@@ -1,35 +0,0 @@
-// Test lyrics plugin for Navidrome plugin system integration tests.
-package main
-
-import (
-	"fmt"
-
-	"github.com/navidrome/navidrome/plugins/pdk/go/lyrics"
-	"github.com/navidrome/navidrome/plugins/pdk/go/pdk"
-)
-
-func init() {
-	lyrics.Register(&testLyrics{})
-}
-
-type testLyrics struct{}
-
-func (t *testLyrics) GetLyrics(input lyrics.GetLyricsRequest) (lyrics.GetLyricsResponse, error) {
-	// Check for configured error
-	errMsg, hasErr := pdk.GetConfig("error")
-	if hasErr && errMsg != "" {
-		return lyrics.GetLyricsResponse{}, fmt.Errorf("%s", errMsg)
-	}
-
-	// Return test lyrics based on track info
-	return lyrics.GetLyricsResponse{
-		Lyrics: []lyrics.LyricsText{
-			{
-				Lang: "eng",
-				Text: "Test lyrics for " + input.Track.Title + "\nBy " + input.Track.Artist,
-			},
-		},
-	}, nil
-}
-
-func main() {}

plugins/testdata/test-lyrics/manifest.json

@@ -1,6 +0,0 @@
-{
-  "name": "Test Lyrics",
-  "author": "Navidrome Test",
-  "version": "1.0.0",
-  "description": "A test lyrics plugin for integration testing"
-}

plugins/testdata/test-taskqueue/go.mod

@@ -1,4 +1,4 @@
-module test-lyrics
+module test-taskqueue
 
 go 1.25
 

plugins/testdata/test-taskqueue/main.go

@@ -0,0 +1,114 @@
+// Test TaskQueue plugin for Navidrome plugin system integration tests.
+// Build with: tinygo build -o ../test-taskqueue.wasm -target wasip1 -buildmode=c-shared .
+package main
+
+import (
+	"fmt"
+
+	"github.com/navidrome/navidrome/plugins/pdk/go/host"
+	"github.com/navidrome/navidrome/plugins/pdk/go/pdk"
+	"github.com/navidrome/navidrome/plugins/pdk/go/taskworker"
+)
+
+func init() {
+	taskworker.Register(&handler{})
+}
+
+type handler struct{}
+
+func (h *handler) OnTaskExecute(req taskworker.TaskExecuteRequest) (string, error) {
+	payload := string(req.Payload)
+	if payload == "fail" {
+		return "", fmt.Errorf("task failed as instructed")
+	}
+	if payload == "fail-then-succeed" && req.Attempt < 2 {
+		return "", fmt.Errorf("transient failure")
+	}
+	return "completed successfully", nil
+}
+
+// Test helper types
+type TestInput struct {
+	Operation string            `json:"operation"`
+	QueueName string            `json:"queueName,omitempty"`
+	Config    *host.QueueConfig `json:"config,omitempty"`
+	Payload   []byte            `json:"payload,omitempty"`
+	TaskID    string            `json:"taskId,omitempty"`
+}
+
+type TestOutput struct {
+	TaskID  string  `json:"taskId,omitempty"`
+	Status  string  `json:"status,omitempty"`
+	Message string  `json:"message,omitempty"`
+	Attempt int32   `json:"attempt,omitempty"`
+	Cleared int64   `json:"cleared,omitempty"`
+	Error   *string `json:"error,omitempty"`
+}
+
+//go:wasmexport nd_test_taskqueue
+func ndTestTaskQueue() int32 {
+	var input TestInput
+	if err := pdk.InputJSON(&input); err != nil {
+		errStr := err.Error()
+		pdk.OutputJSON(TestOutput{Error: &errStr})
+		return 0
+	}
+
+	switch input.Operation {
+	case "create_queue":
+		config := host.QueueConfig{}
+		if input.Config != nil {
+			config = *input.Config
+		}
+		err := host.TaskCreateQueue(input.QueueName, config)
+		if err != nil {
+			errStr := err.Error()
+			pdk.OutputJSON(TestOutput{Error: &errStr})
+			return 0
+		}
+		pdk.OutputJSON(TestOutput{})
+
+	case "enqueue":
+		taskID, err := host.TaskEnqueue(input.QueueName, input.Payload)
+		if err != nil {
+			errStr := err.Error()
+			pdk.OutputJSON(TestOutput{Error: &errStr})
+			return 0
+		}
+		pdk.OutputJSON(TestOutput{TaskID: taskID})
+
+	case "get_task_status":
+		info, err := host.TaskGet(input.TaskID)
+		if err != nil {
+			errStr := err.Error()
+			pdk.OutputJSON(TestOutput{Error: &errStr})
+			return 0
+		}
+		pdk.OutputJSON(TestOutput{Status: info.Status, Message: info.Message, Attempt: info.Attempt})
+
+	case "cancel_task":
+		err := host.TaskCancel(input.TaskID)
+		if err != nil {
+			errStr := err.Error()
+			pdk.OutputJSON(TestOutput{Error: &errStr})
+			return 0
+		}
+		pdk.OutputJSON(TestOutput{})
+
+	case "clear_queue":
+		cleared, err := host.TaskClearQueue(input.QueueName)
+		if err != nil {
+			errStr := err.Error()
+			pdk.OutputJSON(TestOutput{Error: &errStr})
+			return 0
+		}
+		pdk.OutputJSON(TestOutput{Cleared: cleared})
+
+	default:
+		errStr := "unknown operation: " + input.Operation
+		pdk.OutputJSON(TestOutput{Error: &errStr})
+	}
+	return 0
+}
+
+func main() {}

plugins/testdata/test-taskqueue/manifest.json

@@ -0,0 +1,12 @@
+{
+  "name": "Test TaskQueue Plugin",
+  "author": "Navidrome Test",
+  "version": "1.0.0",
+  "description": "A test plugin for TaskQueue integration testing",
+  "permissions": {
+    "taskqueue": {
+      "reason": "For testing task queue operations",
+      "maxConcurrency": 10
+    }
+  }
+}

server/e2e/e2e_suite_test.go

@@ -19,7 +19,6 @@ import (
 	"github.com/navidrome/navidrome/core/artwork"
 	"github.com/navidrome/navidrome/core/auth"
 	"github.com/navidrome/navidrome/core/external"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/core/metrics"
 	"github.com/navidrome/navidrome/core/playback"
 	"github.com/navidrome/navidrome/core/playlists"
@@ -397,7 +396,6 @@ func setupTestDB() {
 		core.NewShare(ds),
 		playback.PlaybackServer(nil),
 		metrics.NewNoopInstance(),
-		lyrics.NewLyrics(nil),
 	)
 }
 

server/subsonic/album_lists_test.go

@@ -27,7 +27,7 @@ var _ = Describe("Album Lists", func() {
 		ds = &tests.MockDataStore{}
 		auth.Init(ds)
 		mockRepo = ds.Album(ctx).(*tests.MockAlbumRepo)
-		router = New(ds, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+		router = New(ds, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
 		w = httptest.NewRecorder()
 	})
 

server/subsonic/api.go

@@ -14,7 +14,6 @@ import (
 	"github.com/navidrome/navidrome/core"
 	"github.com/navidrome/navidrome/core/artwork"
 	"github.com/navidrome/navidrome/core/external"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/core/metrics"
 	"github.com/navidrome/navidrome/core/playback"
 	playlistsvc "github.com/navidrome/navidrome/core/playlists"
@@ -49,13 +48,12 @@ type Router struct {
 	share     core.Share
 	playback  playback.PlaybackServer
 	metrics   metrics.Metrics
-	lyrics    lyrics.Lyrics
 }
 
 func New(ds model.DataStore, artwork artwork.Artwork, streamer core.MediaStreamer, archiver core.Archiver,
 	players core.Players, provider external.Provider, scanner model.Scanner, broker events.Broker,
 	playlists playlistsvc.Playlists, scrobbler scrobbler.PlayTracker, share core.Share, playback playback.PlaybackServer,
-	metrics metrics.Metrics, lyrics lyrics.Lyrics,
+	metrics metrics.Metrics,
 ) *Router {
 	r := &Router{
 		ds:        ds,
@@ -71,7 +69,6 @@ func New(ds model.DataStore, artwork artwork.Artwork, streamer core.MediaStreame
 		share:     share,
 		playback:  playback,
 		metrics:   metrics,
-		lyrics:    lyrics,
 	}
 	r.Handler = r.routes()
 	return r

server/subsonic/media_annotation_test.go

@@ -27,7 +27,7 @@ var _ = Describe("MediaAnnotationController", func() {
 		ds = &tests.MockDataStore{}
 		playTracker = &fakePlayTracker{}
 		eventBroker = &fakeEventBroker{}
-		router = New(ds, nil, nil, nil, nil, nil, nil, eventBroker, nil, playTracker, nil, nil, nil, nil)
+		router = New(ds, nil, nil, nil, nil, nil, nil, eventBroker, nil, playTracker, nil, nil, nil)
 	})
 
 	Describe("Scrobble", func() {

server/subsonic/media_retrieval.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/consts"
+	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/log"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/resources"
@@ -108,7 +109,7 @@ func (api *Router) GetLyrics(r *http.Request) (*responses.Subsonic, error) {
 		return response, nil
 	}
 
-	structuredLyrics, err := api.lyrics.GetLyrics(r.Context(), &mediaFiles[0])
+	structuredLyrics, err := lyrics.GetLyrics(r.Context(), &mediaFiles[0])
 	if err != nil {
 		return nil, err
 	}
@@ -141,7 +142,7 @@ func (api *Router) GetLyricsBySongId(r *http.Request) (*responses.Subsonic, erro
 		return nil, err
 	}
 
-	structuredLyrics, err := api.lyrics.GetLyrics(r.Context(), mediaFile)
+	structuredLyrics, err := lyrics.GetLyrics(r.Context(), mediaFile)
 	if err != nil {
 		return nil, err
 	}

server/subsonic/media_retrieval_test.go

@@ -14,7 +14,6 @@ import (
 	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/conf/configtest"
 	"github.com/navidrome/navidrome/core/artwork"
-	"github.com/navidrome/navidrome/core/lyrics"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/server/subsonic/responses"
 	"github.com/navidrome/navidrome/tests"
@@ -34,7 +33,7 @@ var _ = Describe("MediaRetrievalController", func() {
 			MockedMediaFile: mockRepo,
 		}
 		artwork = &fakeArtwork{data: "image data"}
-		router = New(ds, artwork, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, lyrics.NewLyrics(nil))
+		router = New(ds, artwork, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
 		w = httptest.NewRecorder()
 		DeferCleanup(configtest.SetupConfig())
 		conf.Server.LyricsPriority = "embedded,.lrc"

server/subsonic/opensubsonic_test.go

@@ -19,7 +19,7 @@ var _ = Describe("GetOpenSubsonicExtensions", func() {
 	)
 
 	BeforeEach(func() {
-		router = subsonic.New(nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+		router = subsonic.New(nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
 		w = httptest.NewRecorder()
 		r = httptest.NewRequest("GET", "/getOpenSubsonicExtensions?f=json", nil)
 	})

server/subsonic/playlists_test.go

@@ -24,7 +24,7 @@ var _ = Describe("buildPlaylist", func() {
 
 	BeforeEach(func() {
 		ds = &tests.MockDataStore{}
-		router = New(ds, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+		router = New(ds, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
 		ctx = context.Background()
 	})
 
@@ -224,7 +224,7 @@ var _ = Describe("UpdatePlaylist", func() {
 	BeforeEach(func() {
 		ds = &tests.MockDataStore{}
 		playlists = &fakePlaylists{}
-		router = New(ds, nil, nil, nil, nil, nil, nil, nil, playlists, nil, nil, nil, nil, nil)
+		router = New(ds, nil, nil, nil, nil, nil, nil, nil, playlists, nil, nil, nil, nil)
 	})
 
 	It("clears the comment when parameter is empty", func() {

server/subsonic/searching_test.go

@@ -21,7 +21,7 @@ var _ = Describe("Search", func() {
 		ds = &tests.MockDataStore{}
 		auth.Init(ds)
 
-		router = New(ds, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+		router = New(ds, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
 
 		// Get references to the mock repositories so we can inspect their Options
 		mockAlbumRepo = ds.Album(nil).(*tests.MockAlbumRepo)