music-assistant-server

1"""Model/base for a Plugin Provider implementation."""
2
3from __future__ import annotations
4
5from dataclasses import dataclass
6from typing import TYPE_CHECKING, Any
7
8from music_assistant_models.enums import ProviderFeature
9from music_assistant_models.media_items import SearchResults, UniqueList
10
11from .provider import Provider
12
13if TYPE_CHECKING:
14    from collections.abc import AsyncGenerator, Sequence
15
16    from music_assistant_models.enums import MediaType, SourceControl
17    from music_assistant_models.media_items import (
18        AudioSource,
19        BrowseFolder,
20        ItemMapping,
21        MediaItemType,
22        Playlist,
23        RecommendationFolder,
24        Track,
25    )
26    from music_assistant_models.streamdetails import StreamDetails
27
28
29# separator between the owning provider's instance_id and the provider-scoped engine id;
30# occurs in neither MA instance_ids nor Home Assistant entity_ids
31ENGINE_UID_SEPARATOR = "/"
32
33
34@dataclass(kw_only=True)
35class PluginEngine:
36    """
37    A single selectable backend exposed by a plugin provider.
38
39    One plugin can expose several engines (for example one per Home Assistant entity),
40    so consumers offer them as options in a config picker rather than treating the
41    plugin itself as the unit of choice. The chosen engine is stored in config by its
42    ``uid`` and handed back to the owning provider as the provider-scoped ``id``.
43
44    Server-side only: never serialized to clients.
45    """
46
47    id: str
48    name: str
49    provider: PluginProvider
50
51    @property
52    def uid(self) -> str:
53        """Return the globally unique id for this engine, as stored in config."""
54        return f"{self.provider.instance_id}{ENGINE_UID_SEPARATOR}{self.id}"
55
56
57@dataclass(kw_only=True)
58class AIEngine(PluginEngine):
59    """An engine that answers AI queries, invoked through ``PluginProvider.ai_query``."""
60
61
62@dataclass(kw_only=True)
63class TTSEngine(PluginEngine):
64    """An engine that renders speech, invoked through ``PluginProvider.get_tts_message``."""
65
66
67class PluginProvider(Provider):
68    """
69    Base representation of a Plugin for Music Assistant.
70
71    Plugin Provider implementations should inherit from this base model.
72    """
73
74    async def get_audio_sources(self) -> list[AudioSource]:
75        """
76        Return all AudioSources this plugin currently exposes.
77
78        Will only be called if ProviderFeature.AUDIO_SOURCE is declared.
79
80        May change over time (e.g. when a paired hardware device adds/removes
81        favorites). Each AudioSource is a regular MediaItem and will be browsable
82        under the global "Live Inputs" node and playable via the standard play_media flow.
83
84        :return: A list of AudioSource items. Return an empty list if the plugin
85            currently has no sources to expose (e.g. hardware is offline).
86        """
87        if ProviderFeature.AUDIO_SOURCE in self.supported_features:
88            raise NotImplementedError
89        return []
90
91    async def get_stream_details(self, item_id: str, media_type: MediaType) -> StreamDetails:
92        """
93        Return StreamDetails for a streamable item owned by this plugin.
94
95        Called for a playable item this plugin exposes; ``media_type`` says which kind.
96        AudioSource items require ProviderFeature.AUDIO_SOURCE to be declared.
97
98        MUST be side-effect-free. MA calls this from both the streaming path
99        and from queue preload (``_load_item``); claiming ownership here would
100        let a preload accidentally reserve an exclusive source and block a
101        subsequent cross-queue handoff at the actual stream request. Ownership
102        is claimed in ``on_source_selected`` (which fires only on the real
103        stream request, paired with ``on_source_unselected`` in the finally).
104
105        The returned StreamDetails uses the standard fields:
106        ``stream_type`` selects between a custom async generator and a path
107        (e.g. NAMED_PIPE); ``audio_format`` describes the PCM format the source
108        emits; ``stream_metadata`` carries the initial live metadata (and can
109        be updated at runtime via ``mass.streams.update_stream_metadata(queue_id, ...)``,
110        the same channel ICY radio metadata uses).
111
112        Silence-during-pause contract:
113        the player consuming the stream needs a continuous byte flow or it will
114        disconnect after a few seconds. The server keeps the connection alive
115        differently depending on ``stream_type``:
116
117        - ``StreamType.CUSTOM`` — the server wraps ``get_audio_stream`` with a
118          silence-keepalive so a paused upstream device (no bytes yielded) does
119          NOT cause the player to drop out. The plugin can just stop yielding
120          while paused; the wrapper inserts silence frames at the declared PCM
121          format.
122        - ``StreamType.NAMED_PIPE`` — the underlying process MUST keep writing
123          silence to the pipe during pause states (shairport-sync and librespot
124          in pipe/passthrough mode both do this by default). If the producer
125          binary actually stops writing, the consuming ffmpeg will block and
126          the player will eventually disconnect.
127
128        :param item_id: The provider-scoped id of the item requested for playback:
129            an ``AudioSource.item_id`` or the id of another item this plugin owns.
130        :param media_type: The media type of the requested item.
131        """
132        raise NotImplementedError
133
134    async def get_audio_stream(
135        self, streamdetails: StreamDetails, seek_position: int = 0
136    ) -> AsyncGenerator[bytes]:
137        """
138        Return the (custom) audio stream for an AudioSource.
139
140        Will only be called when the StreamDetails returned by get_stream_details
141        has ``stream_type=StreamType.CUSTOM``. The yielded bytes must be in
142        the PCM format declared by ``streamdetails.audio_format``.
143
144        Pausing is fine: when the upstream device is paused the plugin can stop
145        yielding bytes. The server wraps this generator with a silence-keepalive
146        that keeps the player connected by inserting silence at the declared PCM
147        format during quiet periods. The plugin should release any per-session
148        state in a ``try/finally`` — the consumer closes the generator when
149        playback ends or another queue takes over.
150
151        :param streamdetails: The StreamDetails previously returned by get_stream_details.
152        :param seek_position: Ignored for live AudioSources (no seek through the bytestream).
153        """
154        raise NotImplementedError
155        # unreachable, but the yield keeps this method an async generator
156        # so an unimplemented provider fails deterministically without emitting
157        # a stray empty chunk to the downstream consumer first.
158        yield b""  # type: ignore[unreachable]
159
160    async def on_source_control(
161        self,
162        source_id: str,
163        action: SourceControl,
164        value: int | None = None,
165    ) -> None:
166        """
167        Handle a playback control command for an active AudioSource.
168
169        Called by the player controller when the user (or an automation) issues
170        a control command and the active queue item is an AudioSource whose
171        capability flag for the action is True (e.g. ``can_next_previous`` for
172        NEXT/PREVIOUS).
173
174        :param source_id: The AudioSource.item_id the command applies to.
175        :param action: The control action to perform.
176        :param value: Optional numeric value: seek position in seconds for SEEK,
177            volume level 0-100 for VOLUME, ignored for other actions.
178        """
179        raise NotImplementedError
180
181    async def on_source_selected(
182        self,
183        source_id: str,
184        player_id: str,
185        queue_id: str,
186        stream_session_id: str,
187    ) -> None:
188        """
189        React to an AudioSource being selected for playback.
190
191        Plugins exposing an exclusive AudioSource MUST claim ownership in this
192        hook (rather than in ``get_stream_details``). This hook fires only on
193        the actual stream request — not on queue preload — so claiming here
194        keeps the preload path side-effect-free and lets cross-queue handoffs
195        succeed (the streams controller fires this **before**
196        ``get_stream_details`` so the plugin can stop the previous player and
197        replace its claim before the upcoming stream-details fetch).
198
199        ``stream_session_id`` is a fresh per-request token paired with the
200        matching ``on_source_unselected`` call. Plugins should store it (and
201        replace any previously stored value) so the unselect callback can be
202        rejected as stale when a same-queue reconnect interleaves with the
203        prior request's teardown — see ``on_source_unselected`` for details.
204
205        :param source_id: The AudioSource.item_id that was selected.
206        :param player_id: The player that will receive the stream.
207        :param queue_id: The queue that owns this playback session.
208        :param stream_session_id: Opaque controller-generated token identifying
209            this specific stream request. The matching ``on_source_unselected``
210            receives the same value.
211        """
212
213    async def on_source_unselected(
214        self,
215        source_id: str,
216        queue_id: str,
217        stream_session_id: str,
218    ) -> None:
219        """
220        React to MA tearing down an AudioSource stream from this queue.
221
222        Fired in the ``finally`` block of the queue-item streaming handler — so
223        it runs whether the stream ended normally, the player disconnected, the
224        queue moved on, or an exception interrupted streaming. Override to
225        release any per-queue state set in ``get_stream_details`` (notably the
226        exclusive lock used to reject cross-queue claims) so the source becomes
227        available to other queues without depending on an external session
228        event.
229
230        Implementations MUST guard on ``stream_session_id`` matching the value
231        last set in ``on_source_selected``. A queue_id-only check is not
232        sufficient: same-queue reconnects (player drops + reopens the same
233        stream URL before the original request's finally fires) would
234        otherwise let the old request's late callback clear the live claim of
235        the new stream, silently dropping metadata and volume sync.
236
237        :param source_id: The AudioSource.item_id whose stream ended.
238        :param queue_id: The queue whose stream is being torn down.
239        :param stream_session_id: The token paired with ``on_source_selected``
240            for this specific stream request. Ignore the callback if it does
241            not match the currently stored active session id.
242        """
243
244    async def on_volume_change(self, source_id: str, volume: int) -> None:
245        """
246        React to a volume change on the player streaming this AudioSource.
247
248        Optional hook. Override when the plugin wants to sync the upstream
249        device's volume slider with MA (e.g. Spotify Connect updating the
250        Spotify app's volume display, Yandex Ynison forwarding the new
251        level back to the Yandex device). Fired only on the direct queue
252        owner — group volume changes fire once at the group level, not
253        per child.
254
255        :param source_id: The AudioSource.item_id currently streaming.
256        :param volume: The new volume level (0-100).
257        """
258
259    async def get_tts_engines(self) -> list[TTSEngine]:
260        """
261        Return the TTS engines this plugin exposes.
262
263        Will only be called if ProviderFeature.TTS is declared.
264
265        May change over time (e.g. when the backend adds or removes voices/entities).
266        The user picks one of these in the config of a consuming provider.
267
268        :return: A list of TTSEngine items. Return an empty list if the plugin
269            currently has no engines to expose (e.g. the backend is offline).
270        """
271        if ProviderFeature.TTS in self.supported_features:
272            raise NotImplementedError
273        return []
274
275    async def get_tts_message(
276        self,
277        message: str,
278        language: str | None = None,
279        engine_id: str | None = None,
280        options: dict[str, Any] | None = None,
281    ) -> StreamDetails:
282        """
283        Convert text to speech audio.
284
285        Will only be called if ProviderFeature.TTS is declared.
286
287        :param message: The text to convert to speech.
288        :param language: Optional language code.
289        :param engine_id: The provider-scoped id of the engine to use (``TTSEngine.id``,
290            not its ``uid``). Omit or pass None to use the plugin's own default engine.
291        :param options: Optional integration-specific options (for example a voice
292            tuning parameter), passed through to the engine as-is. Ignored by plugins
293            that have none.
294        :return: StreamDetails for the generated audio. ``path`` must be either a
295            fetchable http(s)/rtsp/rtmp URL or the absolute path of an existing local
296            file, and must stay resolvable for as long as consumers may play the clip.
297        """
298        raise NotImplementedError
299
300    async def get_ai_engines(self) -> list[AIEngine]:
301        """
302        Return the AI engines this plugin exposes.
303
304        Will only be called if ProviderFeature.AI_QUERY is declared.
305
306        May change over time (e.g. when the backend adds or removes entities).
307        The user picks one of these in the config of a consuming provider.
308
309        :return: A list of AIEngine items. Return an empty list if the plugin
310            currently has no engines to expose (e.g. the backend is offline).
311        """
312        if ProviderFeature.AI_QUERY in self.supported_features:
313            raise NotImplementedError
314        return []
315
316    async def ai_query(self, query: str, engine_id: str | None = None) -> str:
317        """
318        Handle an AI query.
319
320        Will only be called if ProviderFeature.AI_QUERY is declared.
321
322        :param query: The query/prompt to send.
323        :param engine_id: The provider-scoped id of the engine to use (``AIEngine.id``,
324            not its ``uid``). Omit or pass None to use the plugin's own default engine.
325        :return: The AI response as a string.
326        """
327        raise NotImplementedError
328
329    async def search(
330        self,
331        search_query: str,
332        media_types: list[MediaType],
333        limit: int = 5,
334    ) -> SearchResults:
335        """
336        Perform a search on this plugin.
337
338        Will only be called if ProviderFeature.SEARCH is declared.
339
340        :param search_query: Search query.
341        :param media_types: A list of media_types to include.
342        :param limit: Number of items to return in the search (per type).
343        """
344        if ProviderFeature.SEARCH in self.supported_features:
345            raise NotImplementedError
346        return SearchResults()
347
348    async def get_similar_tracks(self, track: Track, limit: int = 25) -> list[Track]:
349        """
350        Retrieve a list of similar tracks for the given track.
351
352        Will only be called if ProviderFeature.SIMILAR_TRACKS is declared.
353
354        :param track: The reference track.
355        :param limit: Maximum number of similar tracks to return.
356        """
357        if ProviderFeature.SIMILAR_TRACKS in self.supported_features:
358            raise NotImplementedError
359        return []
360
361    async def get_recommendations(self) -> list[RecommendationFolder]:
362        """
363        Get this plugin's available recommendation rows, without items.
364
365        Must be fast: return static or cached row descriptors only, without
366        live backend calls. The items for a row are fetched separately
367        through get_recommendation_items.
368
369        Will only be called if ProviderFeature.RECOMMENDATIONS is declared.
370        """
371        if ProviderFeature.RECOMMENDATIONS in self.supported_features:
372            raise NotImplementedError
373        return []
374
375    async def get_recommendation_items(
376        self, item_id: str
377    ) -> UniqueList[MediaItemType | ItemMapping | BrowseFolder]:
378        """
379        Get the items for a single recommendation row.
380
381        Live backend fetches belong here. Will only be called if
382        ProviderFeature.RECOMMENDATIONS is declared.
383
384        :param item_id: The item_id of the row, as returned by get_recommendations.
385        """
386        if ProviderFeature.RECOMMENDATIONS in self.supported_features:
387            raise NotImplementedError
388        return UniqueList()
389
390    async def browse(self, path: str) -> Sequence[MediaItemType | ItemMapping | BrowseFolder]:
391        """
392        Browse this plugin's contents.
393
394        Will only be called if ProviderFeature.BROWSE is declared.
395
396        :param path: The path to browse, in the form ``<instance_id>://<sub_path>``.
397        """
398        if ProviderFeature.BROWSE in self.supported_features:
399            raise NotImplementedError
400        return []
401
402    async def get_playlist(self, prov_playlist_id: str) -> Playlist:
403        """
404        Return details of a single playlist owned by this plugin.
405
406        :param prov_playlist_id: Provider-scoped playlist id.
407        """
408        raise NotImplementedError
409
410    async def get_playlist_tracks(self, prov_playlist_id: str, page: int = 0) -> list[Track]:
411        """
412        Return a page of tracks for a playlist owned by this plugin.
413
414        :param prov_playlist_id: Provider-scoped playlist id.
415        :param page: Zero-based page index for paginated results.
416        """
417        raise NotImplementedError
418
419    async def resolve_image(self, path: str) -> str | bytes:
420        """
421        Resolve an image from an image path.
422
423        This either returns (a generator to get) raw bytes of the image or
424        a string with an http(s) URL or local path that is accessible from the server.
425        """
426        return path
427