Fix path to MPD logo in Cocoa receiver (oops)

Introduce new WebSockets receiver impl
When enabled, this new receiver will spin up a local WebSockets server and will send the currently playing song information to any clients that connect. It's designed with Übersicht in mind, since WebSockets is the easiest way to efficiently push events into an Übersicht widget, but I'm sure it'd work for a variety of other purposes too. Currently the socket is only used in one direction, pushing the current song info from server to client, but I'll probably extend it to support sending MPD commands from WebSockets clients as well.
2024-07-13 18:38:16 +10:00 · 2024-07-13 18:34:53 +10:00 · 2024-07-11 12:17:09 +10:00 · 2024-07-11 12:15:34 +10:00 · 2024-07-11 12:12:56 +10:00 · 2024-07-10 23:57:34 +10:00
21 changed files with 912 additions and 183 deletions
--- a/pdm.lock
+++ b/pdm.lock
@ -5,7 +5,7 @@
 groups = ["default", "all", "dev"]
 strategy = ["cross_platform"]
 lock_version = "4.4.1"
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 [[package]]
 name = "aiocache"
@ -167,7 +167,7 @@ files = [

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 ]

 [[package]]
@ -410,12 +422,12 @@ files = [

 [[package]]
 name = "redis"
-version = "5.0.4"
+version = "5.0.7"
 requires_python = ">=3.7"
 summary = "Python client for Redis database and key-value store"
 files = [
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 ]

 [[package]]
@ -434,37 +446,74 @@ files = [

 [[package]]
 name = "ruff"
-version = "0.4.10"
+version = "0.5.1"
 requires_python = ">=3.7"
 summary = "An extremely fast Python linter and code formatter, written in Rust."
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 [[package]]
 name = "typing-extensions"
-version = "4.11.0"
+version = "4.12.2"
 requires_python = ">=3.8"
 summary = "Backported and Experimental Type Hints for Python 3.8+"
 files = [
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+]
+
+[[package]]
+name = "websockets"
+version = "12.0"
+requires_python = ">=3.8"
+summary = "An implementation of the WebSocket Protocol (RFC 6455 & 7692)"
+files = [
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+    {file = "websockets-12.0-py3-none-any.whl", hash = "sha256:dc284bbc8d7c78a6c69e0c7325ab46ee5e40bb4d50e494d8131a07ef47500e9e"},
+    {file = "websockets-12.0.tar.gz", hash = "sha256:81df9cbcbb6c260de1e007e58c011bfebe2dafc8435107b0537f393dd38c8b1b"},
 ]

 [[package]]
--- a/pyproject.toml
+++ b/pyproject.toml
@ -8,7 +8,7 @@ authors = [
 dependencies = [
    "aiocache>=0.12.2",
    "attrs>=23.1.0",
-    "pyobjc-framework-MediaPlayer>=10.0",
+    "pyobjc-framework-MediaPlayer>=10.0 ; sys_platform == 'darwin'",
    "python-mpd2>=3.1.0",
    "xdg-base-dirs>=6.0.1",
    "pytomlpp>=1.0.13",
@ -16,6 +16,7 @@ dependencies = [
    "boltons>=24.0.0",
    "pydantic>=2.7.4",
    "rich>=13.7.1",
+    "ormsgpack>=1.5.0",
 ]
 readme = "README.md"

@ -30,9 +31,16 @@ classifiers = [
 ]

 [project.optional-dependencies]
-redis = ["aiocache[redis]", "ormsgpack>=1.5.0"]
-memcached = ["aiocache[memcached]", "ormsgpack>=1.5.0"]
-all = ["mpd-now-playable[redis,memcached]"]
+redis = [
+    "aiocache[redis]",
+]
+memcached = [
+    "aiocache[memcached]",
+]
+websockets = [
+    "websockets>=12.0",
+]
+all = ["mpd-now-playable[redis,memcached,websockets]"]

 [project.urls]
 Homepage = "https://git.00dani.me/00dani/mpd-now-playable"
@ -70,6 +78,7 @@ select = [
 ]
 ignore = [
    "ANN101", # missing-type-self
+    "ANN102", # missing-type-cls
 ]

 [tool.ruff.lint.flake8-annotations]
--- a/schemata/config-v1.json
+++ b/schemata/config-v1.json
@ -1,5 +1,20 @@
 {
 	"$defs": {
+		"CocoaReceiverConfig": {
+			"properties": {
+				"kind": {
+					"const": "cocoa",
+					"default": "cocoa",
+					"enum": [
+						"cocoa"
+					],
+					"title": "Kind",
+					"type": "string"
+				}
+			},
+			"title": "CocoaReceiverConfig",
+			"type": "object"
+		},
 		"MpdConfig": {
 			"properties": {
 				"host": {
@ -27,6 +42,46 @@
 			},
 			"title": "MpdConfig",
 			"type": "object"
+		},
+		"WebsocketsReceiverConfig": {
+			"properties": {
+				"host": {
+					"anyOf": [
+						{
+							"format": "hostname",
+							"type": "string"
+						},
+						{
+							"items": {
+								"format": "hostname",
+								"type": "string"
+							},
+							"type": "array"
+						}
+					],
+					"title": "Host"
+				},
+				"kind": {
+					"const": "websockets",
+					"default": "websockets",
+					"enum": [
+						"websockets"
+					],
+					"title": "Kind",
+					"type": "string"
+				},
+				"port": {
+					"maximum": 65535,
+					"minimum": 1,
+					"title": "Port",
+					"type": "integer"
+				}
+			},
+			"required": [
+				"port"
+			],
+			"title": "WebsocketsReceiverConfig",
+			"type": "object"
 		}
 	},
 	"$id": "https://cdn.00dani.me/m/schemata/mpd-now-playable/config-v1.json",
@ -40,6 +95,32 @@
 		},
 		"mpd": {
 			"$ref": "#/$defs/MpdConfig"
+		},
+		"receivers": {
+			"default": [
+				{
+					"kind": "cocoa"
+				}
+			],
+			"items": {
+				"discriminator": {
+					"mapping": {
+						"cocoa": "#/$defs/CocoaReceiverConfig",
+						"websockets": "#/$defs/WebsocketsReceiverConfig"
+					},
+					"propertyName": "kind"
+				},
+				"oneOf": [
+					{
+						"$ref": "#/$defs/CocoaReceiverConfig"
+					},
+					{
+						"$ref": "#/$defs/WebsocketsReceiverConfig"
+					}
+				]
+			},
+			"title": "Receivers",
+			"type": "array"
 		}
 	},
 	"title": "Config",
--- a/schemata/song-v1.json
+++ b/schemata/song-v1.json
@ -0,0 +1,205 @@
+{
+	"$defs": {
+		"HasArtwork": {
+			"properties": {
+				"data": {
+					"format": "binary",
+					"title": "Data",
+					"type": "string"
+				}
+			},
+			"required": [
+				"data"
+			],
+			"title": "HasArtwork",
+			"type": "object"
+		},
+		"MusicBrainzIds": {
+			"properties": {
+				"artist": {
+					"description": "https://musicbrainz.org/doc/Artist",
+					"format": "uuid",
+					"title": "Artist",
+					"type": "string"
+				},
+				"recording": {
+					"description": "A MusicBrainz recording represents audio from a specific performance. For example, if the same song was released as a studio recording and as a live performance, those two versions of the song are different recordings. The song itself is considered a \"work\", of which two recordings were made. However, recordings are not always associated with a work in the MusicBrainz database, and Picard won't load work IDs by default (you have to enable \"use track relationships\" in the options), so recording IDs are a much more reliable way to identify a particular song. https://musicbrainz.org/doc/Recording",
+					"format": "uuid",
+					"title": "Recording",
+					"type": "string"
+				},
+				"release": {
+					"description": "A MusicBrainz release roughly corresponds to an \"album\", and indeed is stored in a tag called MUSICBRAINZ_ALBUMID. The more general name is meant to encompass all the different ways music can be released. https://musicbrainz.org/doc/Release",
+					"format": "uuid",
+					"title": "Release",
+					"type": "string"
+				},
+				"release_artist": {
+					"description": "Again, the release artist corresponds to an \"album artist\". These MBIDs refer to the same artists in the MusicBrainz database that individual recordings' artist MBIDs do.",
+					"format": "uuid",
+					"title": "Release Artist",
+					"type": "string"
+				},
+				"release_group": {
+					"description": "A MusicBrainz release group roughly corresponds to \"all the editions of a particular album\". For example, if the same album were released on CD, vinyl records, and as a digital download, then all of those would be different releases but share a release group. Note that MPD's support for this tag is relatively new (July 2023) and doesn't seem especially reliable, so it might be missing here even if your music has been tagged with it. Not sure why. https://musicbrainz.org/doc/Release_Group",
+					"format": "uuid",
+					"title": "Release Group",
+					"type": "string"
+				},
+				"track": {
+					"description": "A MusicBrainz track represents a specific instance of a recording appearing as part of some release. For example, if the same song appears on both two-CD and four-CD versions of a soundtrack, then it will be considered the same \"recording\" in both cases, but different \"tracks\". https://musicbrainz.org/doc/Track",
+					"format": "uuid",
+					"title": "Track",
+					"type": "string"
+				},
+				"work": {
+					"description": "A MusicBrainz work represents the idea of a particular song or creation (it doesn't have to be audio). Each work may have multiple recordings (studio versus live, different performers, etc.), with the work ID grouping them together. https://musicbrainz.org/doc/Work",
+					"format": "uuid",
+					"title": "Work",
+					"type": "string"
+				}
+			},
+			"title": "MusicBrainzIds",
+			"type": "object"
+		},
+		"NoArtwork": {
+			"properties": {},
+			"title": "NoArtwork",
+			"type": "object"
+		},
+		"PlaybackState": {
+			"enum": [
+				"play",
+				"pause",
+				"stop"
+			],
+			"title": "PlaybackState",
+			"type": "string"
+		}
+	},
+	"$id": "https://cdn.00dani.me/m/schemata/mpd-now-playable/song-v1.json",
+	"$schema": "https://json-schema.org/draft/2020-12/schema",
+	"properties": {
+		"album": {
+			"description": "The name of the song's containing album, which may be multivalued.",
+			"items": {
+				"type": "string"
+			},
+			"title": "Album",
+			"type": "array"
+		},
+		"album_artist": {
+			"description": "The album's artists. This is often used to group together songs from a single album that featured different artists.",
+			"items": {
+				"type": "string"
+			},
+			"title": "Album Artist",
+			"type": "array"
+		},
+		"art": {
+			"anyOf": [
+				{
+					"$ref": "#/$defs/HasArtwork"
+				},
+				{
+					"$ref": "#/$defs/NoArtwork"
+				}
+			],
+			"description": "The song's cover art, if it has any - the art will be available as bytes if present, ready to be displayed directly by receivers.",
+			"title": "Art"
+		},
+		"artist": {
+			"description": "The song's artists. Will be an empty list if the song has not been tagged with an artist, and may contain multiple values if the song has been tagged with several artists.",
+			"items": {
+				"type": "string"
+			},
+			"title": "Artist",
+			"type": "array"
+		},
+		"composer": {
+			"description": "The song's composers. Again, this is permitted to be multivalued.",
+			"items": {
+				"type": "string"
+			},
+			"title": "Composer",
+			"type": "array"
+		},
+		"disc": {
+			"description": "The disc number of the song on its album. As with the track number, this is usually one-based, but it doesn't have to be.",
+			"title": "Disc",
+			"type": "integer"
+		},
+		"duration": {
+			"description": "The song's duration as read from its tags, measured in seconds. Fractional seconds are allowed.",
+			"title": "Duration",
+			"type": "number"
+		},
+		"elapsed": {
+			"description": "How far into the song MPD is, measured in seconds. Fractional seconds are allowed. This is usually going to be less than or equal to the song's duration, but because the duration is tagged as metadata and this value represents the actual elapsed time, it might go higher if the song's duration tag is inaccurate.",
+			"title": "Elapsed",
+			"type": "number"
+		},
+		"file": {
+			"description": "The relative path to the current song inside the music directory. MPD itself uses this path as a stable identifier for the audio file in many places, so you can safely do the same.",
+			"format": "path",
+			"title": "File",
+			"type": "string"
+		},
+		"genre": {
+			"description": "The song's genre or genres. These are completely arbitrary descriptions and don't follow any particular standard.",
+			"items": {
+				"type": "string"
+			},
+			"title": "Genre",
+			"type": "array"
+		},
+		"musicbrainz": {
+			"$ref": "#/$defs/MusicBrainzIds",
+			"description": "The MusicBrainz IDs associated with the song and with its artist and album, which if present are an extremely accurate way to identify a given song. They're not always present, though."
+		},
+		"queue_index": {
+			"description": "The zero-based index of the current song in MPD's queue.",
+			"title": "Queue Index",
+			"type": "integer"
+		},
+		"queue_length": {
+			"description": "The total length of MPD's queue - the last song in the queue will have the index one less than this, since queue indices are zero-based.",
+			"title": "Queue Length",
+			"type": "integer"
+		},
+		"state": {
+			"$ref": "#/$defs/PlaybackState",
+			"description": "Whether MPD is currently playing, paused, or stopped. Pretty simple."
+		},
+		"title": {
+			"description": "The song's title, if it's been tagged with one. Currently only one title is supported, since it doesn't make a lot of sense to tag a single audio file with multiple titles.",
+			"title": "Title",
+			"type": "string"
+		},
+		"track": {
+			"description": "The track number the song has on its album. This is usually one-based, but it's just an arbitrary audio tag so a particular album might start at zero or do something weird with it.",
+			"title": "Track",
+			"type": "integer"
+		}
+	},
+	"required": [
+		"state",
+		"queue_index",
+		"queue_length",
+		"file",
+		"title",
+		"artist",
+		"composer",
+		"album",
+		"album_artist",
+		"track",
+		"disc",
+		"genre",
+		"duration",
+		"elapsed",
+		"art",
+		"musicbrainz"
+	],
+	"title": "Song",
+	"type": "object"
+}
--- a/src/mpd_now_playable/cli.py
+++ b/src/mpd_now_playable/cli.py
@ -1,30 +1,41 @@
 import asyncio
+from collections.abc import Iterable

-from corefoundationasyncio import CoreFoundationEventLoop
 from rich import print

 from .__version__ import __version__
-from .cocoa.now_playing import CocoaNowPlaying
 from .config.load import loadConfig
+from .config.model import Config
 from .mpd.listener import MpdStateListener
+from .song_receiver import (
+	Receiver,
+	choose_loop_factory,
+	construct_receiver,
+)


-async def listen() -> None:
-	print(f"mpd-now-playable v{__version__}")
-	config = loadConfig()
-	print(config)
-	listener = MpdStateListener(config.cache)
-	now_playing = CocoaNowPlaying(listener)
+async def listen(
+	config: Config, listener: MpdStateListener, receivers: Iterable[Receiver]
+) -> None:
 	await listener.start(config.mpd)
-	await listener.loop(now_playing)
-
-
-def make_loop() -> CoreFoundationEventLoop:
-	return CoreFoundationEventLoop(console_app=True)
+	await asyncio.gather(*(rec.start(listener) for rec in receivers))
+	await listener.loop(receivers)


 def main() -> None:
-	asyncio.run(listen(), loop_factory=make_loop, debug=True)
+	print(f"mpd-now-playable v{__version__}")
+	config = loadConfig()
+	print(config)
+
+	listener = MpdStateListener(config.cache)
+	receivers = tuple(construct_receiver(rec_config) for rec_config in config.receivers)
+	factory = choose_loop_factory(receivers)
+
+	asyncio.run(
+		listen(config, listener, receivers),
+		loop_factory=factory.make_loop,
+		debug=True,
+	)


 if __name__ == "__main__":
--- a/src/mpd_now_playable/config/model.py
+++ b/src/mpd_now_playable/config/model.py
@ -1,10 +1,41 @@
 from dataclasses import dataclass, field
-from typing import Optional
+from typing import Annotated, Literal, Optional, Protocol
+
+from pydantic import Field

 from ..tools.schema.define import schema
 from .fields import Host, Password, Port, Url

-__all__ = ("MpdConfig", "Config")
+__all__ = (
+	"Config",
+	"MpdConfig",
+	"BaseReceiverConfig",
+	"CocoaReceiverConfig",
+	"WebsocketsReceiverConfig",
+)
+
+
+class BaseReceiverConfig(Protocol):
+	@property
+	def kind(self) -> str: ...
+
+
+@dataclass(slots=True)
+class CocoaReceiverConfig(BaseReceiverConfig):
+	kind: Literal["cocoa"] = field(default="cocoa", repr=False)
+
+
+@dataclass(slots=True, kw_only=True)
+class WebsocketsReceiverConfig(BaseReceiverConfig):
+	kind: Literal["websockets"] = field(default="websockets", repr=False)
+	port: Port
+	host: Optional[Host | tuple[Host, ...]] = None
+
+
+ReceiverConfig = Annotated[
+	CocoaReceiverConfig | WebsocketsReceiverConfig,
+	Field(discriminator="kind"),
+]


@dataclass(slots=True)
@ -27,3 +58,4 @@ class Config:
 	#: protocols are memory://, redis://, and memcached://.
 	cache: Optional[Url] = None
 	mpd: MpdConfig = field(default_factory=MpdConfig)
+	receivers: tuple[ReceiverConfig, ...] = (CocoaReceiverConfig(),)
--- a/src/mpd_now_playable/mpd/listener.py
+++ b/src/mpd_now_playable/mpd/listener.py
@ -1,6 +1,6 @@
 import asyncio
+from collections.abc import Iterable
 from pathlib import Path
-from uuid import UUID

 from mpd.asyncio import MPDClient
 from mpd.base import CommandError
@ -9,7 +9,8 @@ from yarl import URL

 from ..config.model import MpdConfig
 from ..player import Player
-from ..song import Artwork, PlaybackState, Song, SongListener, to_artwork
+from ..song import Artwork, PlaybackState, Song, to_artwork, to_brainz
+from ..song_receiver import Receiver
 from ..tools.types import convert_if_exists, un_maybe_plural
 from .artwork_cache import MpdArtworkCache
 from .types import CurrentSongResponse, StatusResponse
@ -23,10 +24,6 @@ def mpd_current_to_song(
 		queue_index=int(current["pos"]),
 		queue_length=int(status["playlistlength"]),
 		file=Path(current["file"]),
-		musicbrainz_trackid=convert_if_exists(current.get("musicbrainz_trackid"), UUID),
-		musicbrainz_releasetrackid=convert_if_exists(
-			current.get("musicbrainz_releasetrackid"), UUID
-		),
 		title=current.get("title"),
 		artist=un_maybe_plural(current.get("artist")),
 		album=un_maybe_plural(current.get("album")),
@ -37,13 +34,14 @@ def mpd_current_to_song(
 		disc=convert_if_exists(current.get("disc"), int),
 		duration=float(status["duration"]),
 		elapsed=float(status["elapsed"]),
+		musicbrainz=to_brainz(current),
 		art=art,
 	)


 class MpdStateListener(Player):
 	client: MPDClient
-	listener: SongListener
+	receivers: Iterable[Receiver]
 	art_cache: MpdArtworkCache
 	idle_count = 0

@ -62,18 +60,18 @@ class MpdStateListener(Player):
 		print(f"Connected to MPD v{self.client.mpd_version}")

 	async def refresh(self) -> None:
-		await self.update_listener(self.listener)
+		await self.update_receivers()

-	async def loop(self, listener: SongListener) -> None:
-		self.listener = listener
-		# notify our listener of the initial state MPD is in when this script loads up.
-		await self.update_listener(listener)
+	async def loop(self, receivers: Iterable[Receiver]) -> None:
+		self.receivers = receivers
+		# notify our receivers of the initial state MPD is in when this script loads up.
+		await self.update_receivers()
 		# then wait for stuff to change in MPD. :)
 		async for _ in self.client.idle():
 			self.idle_count += 1
-			await self.update_listener(listener)
+			await self.update_receivers()

-	async def update_listener(self, listener: SongListener) -> None:
+	async def update_receivers(self) -> None:
 		# If any async calls in here take long enough that we got another MPD idle event, we want to bail out of this older update.
 		starting_idle_count = self.idle_count
 		status, current = await asyncio.gather(
@ -85,7 +83,7 @@ class MpdStateListener(Player):

 		if status["state"] == "stop":
 			print("Nothing playing")
-			listener.update(None)
+			await self.update(None)
 			return

 		art = await self.art_cache.get_cached_artwork(current)
@ -94,7 +92,10 @@ class MpdStateListener(Player):

 		song = mpd_current_to_song(status, current, to_artwork(art))
 		rprint(song)
-		listener.update(song)
+		await self.update(song)
+
+	async def update(self, song: Song | None) -> None:
+		await asyncio.gather(*(r.update(song) for r in self.receivers))

 	async def get_art(self, file: str) -> bytes | None:
 		picture = await self.readpicture(file)
--- a/src/mpd_now_playable/receivers/init.py
+++ b/src/mpd_now_playable/receivers/init.py
--- a/src/mpd_now_playable/receivers/cocoa/init.py
+++ b/src/mpd_now_playable/receivers/cocoa/init.py
@ -0,0 +1,3 @@
+__all__ = ("receiver",)
+
+from .now_playing import CocoaNowPlayingReceiver as receiver
--- a/src/mpd_now_playable/receivers/cocoa/now_playing.py
+++ b/src/mpd_now_playable/receivers/cocoa/now_playing.py
@ -1,7 +1,9 @@
 from collections.abc import Callable, Coroutine
 from pathlib import Path
+from typing import Literal

 from AppKit import NSCompositingOperationCopy, NSImage, NSMakeRect
+from corefoundationasyncio import CoreFoundationEventLoop
 from Foundation import CGSize, NSMutableDictionary
 from MediaPlayer import (
 	MPChangePlaybackPositionCommandEvent,
@ -35,15 +37,17 @@ from MediaPlayer import (
 	MPRemoteCommandHandlerStatusSuccess,
 )

-from ..player import Player
-from ..song import PlaybackState, Song
-from ..tools.asyncio import run_background_task
+from ...config.model import CocoaReceiverConfig
+from ...player import Player
+from ...song import PlaybackState, Song
+from ...song_receiver import LoopFactory, Receiver
+from ...tools.asyncio import run_background_task
 from .persistent_id import song_to_persistent_id


 def logo_to_ns_image() -> NSImage:
 	return NSImage.alloc().initByReferencingFile_(
-		str(Path(__file__).parent.parent / "mpd/logo.svg")
+		str(Path(__file__).parent.parent.parent / "mpd/logo.svg")
 	)


@ -127,8 +131,25 @@ def nothing_to_media_item() -> NSMutableDictionary:
 MPD_LOGO = ns_image_to_media_item_artwork(logo_to_ns_image())


-class CocoaNowPlaying:
-	def __init__(self, player: Player):
+class CocoaLoopFactory(LoopFactory[CoreFoundationEventLoop]):
+	@property
+	def is_replaceable(self) -> Literal[False]:
+		return False
+
+	@classmethod
+	def make_loop(cls) -> CoreFoundationEventLoop:
+		return CoreFoundationEventLoop(console_app=True)
+
+
+class CocoaNowPlayingReceiver(Receiver):
+	@classmethod
+	def loop_factory(cls) -> LoopFactory[CoreFoundationEventLoop]:
+		return CocoaLoopFactory()
+
+	def __init__(self, config: CocoaReceiverConfig):
+		pass
+
+	async def start(self, player: Player) -> None:
 		self.cmd_center = MPRemoteCommandCenter.sharedCommandCenter()
 		self.info_center = MPNowPlayingInfoCenter.defaultCenter()

@ -166,7 +187,7 @@ class CocoaNowPlaying:
 		# unpause with remote commands.
 		self.info_center.setPlaybackState_(MPMusicPlaybackStatePlaying)

-	def update(self, song: Song | None) -> None:
+	async def update(self, song: Song | None) -> None:
 		if song:
 			self.info_center.setNowPlayingInfo_(song_to_media_item(song))
 			self.info_center.setPlaybackState_(playback_state_to_cocoa(song.state))
--- a/src/mpd_now_playable/receivers/cocoa/persistent_id.py
+++ b/src/mpd_now_playable/receivers/cocoa/persistent_id.py
@ -3,29 +3,31 @@ from pathlib import Path
 from typing import Final
 from uuid import UUID

-from ..song import Song
+from ...song import Song

 # The maximum size for a BLAKE2b "person" value is sixteen bytes, so we need to be concise.
 HASH_PERSON_PREFIX: Final = b"mnp.mac."
-TRACKID_HASH_PERSON: Final = HASH_PERSON_PREFIX + b"mb_tid"
-RELEASETRACKID_HASH_PERSON: Final = HASH_PERSON_PREFIX + b"mb_rtid"
+RECORDING_ID_HASH_PERSON: Final = HASH_PERSON_PREFIX + b"mb_rid"
+TRACK_ID_HASH_PERSON: Final = HASH_PERSON_PREFIX + b"mb_tid"
 FILE_HASH_PERSON: Final = HASH_PERSON_PREFIX + b"f"

 PERSISTENT_ID_BITS: Final = 64
 PERSISTENT_ID_BYTES: Final = PERSISTENT_ID_BITS // 8


-def digest_trackid(trackid: UUID) -> bytes:
+def digest_recording_id(recording_id: UUID) -> bytes:
 	return blake2b(
-		trackid.bytes, digest_size=PERSISTENT_ID_BYTES, person=TRACKID_HASH_PERSON
+		recording_id.bytes,
+		digest_size=PERSISTENT_ID_BYTES,
+		person=RECORDING_ID_HASH_PERSON,
 	).digest()


-def digest_releasetrackid(trackid: UUID) -> bytes:
+def digest_track_id(track_id: UUID) -> bytes:
 	return blake2b(
-		trackid.bytes,
+		track_id.bytes,
 		digest_size=PERSISTENT_ID_BYTES,
-		person=RELEASETRACKID_HASH_PERSON,
+		person=TRACK_ID_HASH_PERSON,
 	).digest()


@ -41,10 +43,10 @@ def digest_file_uri(file: Path) -> bytes:
 # that from the file URI. BLAKE2 can be customised to different digest sizes,
 # making it perfect for this problem.
 def song_to_persistent_id(song: Song) -> int:
-	if song.musicbrainz_trackid:
-		hashed_id = digest_trackid(song.musicbrainz_trackid)
-	elif song.musicbrainz_releasetrackid:
-		hashed_id = digest_releasetrackid(song.musicbrainz_releasetrackid)
+	if song.musicbrainz.recording:
+		hashed_id = digest_recording_id(song.musicbrainz.recording)
+	elif song.musicbrainz.track:
+		hashed_id = digest_track_id(song.musicbrainz.track)
 	else:
 		hashed_id = digest_file_uri(song.file)
 	return int.from_bytes(hashed_id)
--- a/src/mpd_now_playable/receivers/websockets/init.py
+++ b/src/mpd_now_playable/receivers/websockets/init.py
@ -0,0 +1,2 @@
+__all__ = ('receiver',)
+from .receiver import WebsocketsReceiver as receiver
--- a/src/mpd_now_playable/receivers/websockets/receiver.py
+++ b/src/mpd_now_playable/receivers/websockets/receiver.py
@ -0,0 +1,52 @@
+from pathlib import Path
+
+import ormsgpack
+from websockets import broadcast
+from websockets.server import WebSocketServerProtocol, serve
+
+from ...config.model import WebsocketsReceiverConfig
+from ...player import Player
+from ...song import Song
+from ...song_receiver import DefaultLoopFactory, Receiver
+
+MSGPACK_NULL = ormsgpack.packb(None)
+
+
+def default(value: object) -> object:
+	if isinstance(value, Path):
+		return str(value)
+	raise TypeError
+
+
+class WebsocketsReceiver(Receiver):
+	config: WebsocketsReceiverConfig
+	player: Player
+	connections: set[WebSocketServerProtocol]
+	last_status: bytes = MSGPACK_NULL
+
+	def __init__(self, config: WebsocketsReceiverConfig):
+		self.config = config
+		self.connections = set()
+
+	@classmethod
+	def loop_factory(cls) -> DefaultLoopFactory:
+		return DefaultLoopFactory()
+
+	async def start(self, player: Player) -> None:
+		self.player = player
+		await serve(self.handle, host=self.config.host, port=self.config.port)
+
+	async def handle(self, conn: WebSocketServerProtocol) -> None:
+		self.connections.add(conn)
+		await conn.send(self.last_status)
+		try:
+			await conn.wait_closed()
+		finally:
+			self.connections.remove(conn)
+
+	async def update(self, song: Song | None) -> None:
+		if song is None:
+			self.last_status = MSGPACK_NULL
+		else:
+			self.last_status = ormsgpack.packb(song, default=default)
+		broadcast(self.connections, self.last_status)
--- a/src/mpd_now_playable/song.py
+++ b/src/mpd_now_playable/song.py
@ -1,59 +0,0 @@
-from dataclasses import dataclass, field
-from enum import StrEnum
-from pathlib import Path
-from typing import Literal, Protocol
-from uuid import UUID
-
-from pydantic.type_adapter import TypeAdapter
-
-
-class PlaybackState(StrEnum):
-	play = "play"
-	pause = "pause"
-	stop = "stop"
-
-
-@dataclass(slots=True)
-class HasArtwork:
-	data: bytes = field(repr=False)
-
-
-@dataclass(slots=True)
-class NoArtwork:
-	def __bool__(self) -> Literal[False]:
-		return False
-
-
-Artwork = HasArtwork | NoArtwork
-ArtworkSchema: TypeAdapter[Artwork] = TypeAdapter(HasArtwork | NoArtwork)
-
-
-def to_artwork(art: bytes | None) -> Artwork:
-	if art is None:
-		return NoArtwork()
-	return HasArtwork(art)
-
-
-@dataclass(slots=True)
-class Song:
-	state: PlaybackState
-	queue_index: int
-	queue_length: int
-	file: Path
-	musicbrainz_trackid: UUID | None
-	musicbrainz_releasetrackid: UUID | None
-	title: str | None
-	artist: list[str]
-	composer: list[str]
-	album: list[str]
-	album_artist: list[str]
-	track: int | None
-	disc: int | None
-	genre: list[str]
-	duration: float
-	elapsed: float
-	art: Artwork
-
-
-class SongListener(Protocol):
-	def update(self, song: Song | None) -> None: ...
--- a/src/mpd_now_playable/song/init.py
+++ b/src/mpd_now_playable/song/init.py
@ -0,0 +1,12 @@
+from .artwork import Artwork, ArtworkSchema, to_artwork
+from .musicbrainz import to_brainz
+from .song import PlaybackState, Song
+
+__all__ = (
+	"Artwork",
+	"ArtworkSchema",
+	"to_artwork",
+	"to_brainz",
+	"PlaybackState",
+	"Song",
+)
--- a/src/mpd_now_playable/song/artwork.py
+++ b/src/mpd_now_playable/song/artwork.py
@ -0,0 +1,25 @@
+from dataclasses import dataclass, field
+from typing import Literal
+
+from pydantic.type_adapter import TypeAdapter
+
+
+@dataclass(slots=True)
+class HasArtwork:
+	data: bytes = field(repr=False)
+
+
+@dataclass(slots=True)
+class NoArtwork:
+	def __bool__(self) -> Literal[False]:
+		return False
+
+
+Artwork = HasArtwork | NoArtwork
+ArtworkSchema: TypeAdapter[Artwork] = TypeAdapter(HasArtwork | NoArtwork)
+
+
+def to_artwork(art: bytes | None) -> Artwork:
+	if art is None:
+		return NoArtwork()
+	return HasArtwork(art)
--- a/src/mpd_now_playable/song/musicbrainz.py
+++ b/src/mpd_now_playable/song/musicbrainz.py
@ -0,0 +1,99 @@
+from dataclasses import dataclass
+from functools import partial
+from typing import Annotated, TypedDict
+from uuid import UUID
+
+from pydantic import Field
+
+from ..tools.types import option_fmap
+
+option_uuid = partial(option_fmap, UUID)
+OptionUUID = Annotated[UUID | None, Field(default=None)]
+
+
+class MusicBrainzTags(TypedDict, total=False):
+	"""
+	The MusicBrainz tags mpd-now-playable expects and will load (all optional).
+	They're named slightly differently than the actual MusicBrainz IDs they
+	store - use to_brainz to map them across to their canonical form.
+	https://picard-docs.musicbrainz.org/downloads/MusicBrainz_Picard_Tag_Map.html
+	"""
+
+	#: MusicBrainz Recording ID
+	musicbrainz_trackid: str
+	#: MusicBrainz Track ID
+	musicbrainz_releasetrackid: str
+	#: MusicBrainz Artist ID
+	musicbrainz_artistid: str
+	#: MusicBrainz Release ID
+	musicbrainz_albumid: str
+	#: MusicBrainz Release Artist ID
+	musicbrainz_albumartistid: str
+	#: MusicBrainz Release Group ID
+	musicbrainz_releasegroupid: str
+	#: MusicBrainz Work ID
+	musicbrainz_workid: str
+
+
+@dataclass(slots=True)
+class MusicBrainzIds:
+	#: A MusicBrainz recording represents audio from a specific performance.
+	#: For example, if the same song was released as a studio recording and as
+	#: a live performance, those two versions of the song are different
+	#: recordings. The song itself is considered a "work", of which two
+	#: recordings were made. However, recordings are not always associated with
+	#: a work in the MusicBrainz database, and Picard won't load work IDs by
+	#: default (you have to enable "use track relationships" in the options),
+	#: so recording IDs are a much more reliable way to identify a particular
+	#: song.
+	#: https://musicbrainz.org/doc/Recording
+	recording: OptionUUID
+
+	#: A MusicBrainz work represents the idea of a particular song or creation
+	#: (it doesn't have to be audio). Each work may have multiple recordings
+	#: (studio versus live, different performers, etc.), with the work ID
+	#: grouping them together.
+	#: https://musicbrainz.org/doc/Work
+	work: OptionUUID
+
+	#: A MusicBrainz track represents a specific instance of a recording
+	#: appearing as part of some release. For example, if the same song appears
+	#: on both two-CD and four-CD versions of a soundtrack, then it will be
+	#: considered the same "recording" in both cases, but different "tracks".
+	#: https://musicbrainz.org/doc/Track
+	track: OptionUUID
+
+	#: https://musicbrainz.org/doc/Artist
+	artist: OptionUUID
+
+	#: A MusicBrainz release roughly corresponds to an "album", and indeed is
+	#: stored in a tag called MUSICBRAINZ_ALBUMID. The more general name is
+	#: meant to encompass all the different ways music can be released.
+	#: https://musicbrainz.org/doc/Release
+	release: OptionUUID
+
+	#: Again, the release artist corresponds to an "album artist". These MBIDs
+	#: refer to the same artists in the MusicBrainz database that individual
+	#: recordings' artist MBIDs do.
+	release_artist: OptionUUID
+
+	#: A MusicBrainz release group roughly corresponds to "all the editions of
+	#: a particular album". For example, if the same album were released on CD,
+	#: vinyl records, and as a digital download, then all of those would be
+	#: different releases but share a release group. Note that MPD's support
+	#: for this tag is relatively new (July 2023) and doesn't seem especially
+	#: reliable, so it might be missing here even if your music has been tagged
+	#: with it. Not sure why. https://musicbrainz.org/doc/Release_Group
+	release_group: OptionUUID
+
+
+def to_brainz(tags: MusicBrainzTags) -> MusicBrainzIds:
+	return MusicBrainzIds(
+		recording=option_uuid(tags.get("musicbrainz_trackid")),
+		work=option_uuid(tags.get("musicbrainz_workid")),
+		track=option_uuid(tags.get("musicbrainz_releasetrackid")),
+		artist=option_uuid(tags.get("musicbrainz_artistid")),
+		release=option_uuid(tags.get("musicbrainz_albumid")),
+		release_artist=option_uuid(tags.get("musicbrainz_albumartistid")),
+		release_group=option_uuid(tags.get("musicbrainz_releasegroupid")),
+	)
--- a/src/mpd_now_playable/song/song.py
+++ b/src/mpd_now_playable/song/song.py
@ -0,0 +1,81 @@
+from dataclasses import dataclass
+from enum import StrEnum
+from pathlib import Path
+
+from ..tools.schema.define import schema
+from .artwork import Artwork
+from .musicbrainz import MusicBrainzIds
+
+
+class PlaybackState(StrEnum):
+	play = "play"
+	pause = "pause"
+	stop = "stop"
+
+
+@schema("https://cdn.00dani.me/m/schemata/mpd-now-playable/song-v1.json")
+@dataclass(slots=True)
+class Song:
+	#: Whether MPD is currently playing, paused, or stopped. Pretty simple.
+	state: PlaybackState
+
+	#: The zero-based index of the current song in MPD's queue.
+	queue_index: int
+	#: The total length of MPD's queue - the last song in the queue will have
+	#: the index one less than this, since queue indices are zero-based.
+	queue_length: int
+
+	#: The relative path to the current song inside the music directory. MPD
+	#: itself uses this path as a stable identifier for the audio file in many
+	#: places, so you can safely do the same.
+	file: Path
+
+	#: The song's title, if it's been tagged with one. Currently only one title
+	#: is supported, since it doesn't make a lot of sense to tag a single audio
+	#: file with multiple titles.
+	title: str | None
+
+	#: The song's artists. Will be an empty list if the song has not been
+	#: tagged with an artist, and may contain multiple values if the song has
+	#: been tagged with several artists.
+	artist: list[str]
+	#: The song's composers. Again, this is permitted to be multivalued.
+	composer: list[str]
+	#: The name of the song's containing album, which may be multivalued.
+	album: list[str]
+	#: The album's artists. This is often used to group together songs from a
+	#: single album that featured different artists.
+	album_artist: list[str]
+
+	#: The track number the song has on its album. This is usually one-based,
+	#: but it's just an arbitrary audio tag so a particular album might start
+	#: at zero or do something weird with it.
+	track: int | None
+
+	#: The disc number of the song on its album. As with the track number, this
+	#: is usually one-based, but it doesn't have to be.
+	disc: int | None
+
+	#: The song's genre or genres. These are completely arbitrary descriptions
+	#: and don't follow any particular standard.
+	genre: list[str]
+
+	#: The song's duration as read from its tags, measured in seconds.
+	#: Fractional seconds are allowed.
+	duration: float
+
+	#: How far into the song MPD is, measured in seconds. Fractional seconds
+	#: are allowed. This is usually going to be less than or equal to the
+	#: song's duration, but because the duration is tagged as metadata and this
+	#: value represents the actual elapsed time, it might go higher if the
+	#: song's duration tag is inaccurate.
+	elapsed: float
+
+	#: The song's cover art, if it has any - the art will be available as bytes
+	#: if present, ready to be displayed directly by receivers.
+	art: Artwork
+
+	#: The MusicBrainz IDs associated with the song and with its artist and
+	#: album, which if present are an extremely accurate way to identify a
+	#: given song. They're not always present, though.
+	musicbrainz: MusicBrainzIds
--- a/src/mpd_now_playable/song_receiver.py
+++ b/src/mpd_now_playable/song_receiver.py
@ -0,0 +1,83 @@
+from asyncio import AbstractEventLoop, new_event_loop
+from dataclasses import dataclass
+from importlib import import_module
+from typing import Generic, Iterable, Literal, Protocol, TypeVar, cast
+
+from .config.model import BaseReceiverConfig
+from .player import Player
+from .song import Song
+from .tools.types import not_none
+
+T = TypeVar("T", bound=AbstractEventLoop, covariant=True)
+
+
+class LoopFactory(Generic[T], Protocol):
+	@property
+	def is_replaceable(self) -> bool: ...
+
+	@classmethod
+	def make_loop(cls) -> T: ...
+
+
+class Receiver(Protocol):
+	def __init__(self, config: BaseReceiverConfig): ...
+	@classmethod
+	def loop_factory(cls) -> LoopFactory[AbstractEventLoop]: ...
+
+	async def start(self, player: Player) -> None: ...
+	async def update(self, song: Song | None) -> None: ...
+
+
+class ReceiverModule(Protocol):
+	receiver: type[Receiver]
+
+
+class DefaultLoopFactory(LoopFactory[AbstractEventLoop]):
+	@property
+	def is_replaceable(self) -> Literal[True]:
+		return True
+
+	@classmethod
+	def make_loop(cls) -> AbstractEventLoop:
+		return new_event_loop()
+
+
+@dataclass
+class IncompatibleReceiverError(Exception):
+	a: Receiver
+	b: Receiver
+
+
+def import_receiver(config: BaseReceiverConfig) -> type[Receiver]:
+	mod = cast(
+		ReceiverModule, import_module(f"mpd_now_playable.receivers.{config.kind}")
+	)
+	return mod.receiver
+
+
+def construct_receiver(config: BaseReceiverConfig) -> Receiver:
+	cls = import_receiver(config)
+	return cls(config)
+
+
+def choose_loop_factory(
+	receivers: Iterable[Receiver],
+) -> LoopFactory[AbstractEventLoop]:
+	"""Given the desired receivers, determine which asyncio event loop implementation will support all of them. Will raise an IncompatibleReceiverError if no such implementation exists."""
+
+	chosen_fac: LoopFactory[AbstractEventLoop] = DefaultLoopFactory()
+	chosen_rec: Receiver | None = None
+
+	for rec in receivers:
+		fac = rec.loop_factory()
+		if fac.is_replaceable:
+			continue
+
+		if chosen_fac.is_replaceable:
+			chosen_fac = fac
+		elif type(fac) is not type(chosen_fac):
+			raise IncompatibleReceiverError(rec, not_none(chosen_rec))
+
+		chosen_rec = rec
+
+	return chosen_fac
--- a/src/mpd_now_playable/tools/schema/generate.py
+++ b/src/mpd_now_playable/tools/schema/generate.py
@ -45,3 +45,9 @@ class MyGenerateJsonSchema(GenerateJsonSchema):

 	def nullable_schema(self, schema: s.NullableSchema) -> JsonSchemaValue:
 		return self.generate_inner(schema["schema"])
+
+if __name__ == '__main__':
+	from ...config.model import Config
+	from ...song import Song
+	write(Config)
+	write(Song)
--- a/src/mpd_now_playable/tools/types.py
+++ b/src/mpd_now_playable/tools/types.py
@ -4,6 +4,7 @@ from typing import Any, TypeAlias, TypeVar
 __all__ = (
 	"AnyExceptList",
 	"MaybePlural",
+	"option_fmap",
 	"convert_if_exists",
 	"un_maybe_plural",
 )
@ -29,6 +30,19 @@ AnyExceptList = (


 U = TypeVar("U")
+V = TypeVar("V")
+
+
+def not_none(value: U | None) -> U:
+	if value is None:
+		raise ValueError("None should not be possible here.")
+	return value
+
+
+def option_fmap(f: Callable[[U], V], value: U | None) -> V | None:
+	if value is None:
+		return None
+	return f(value)


 def convert_if_exists(value: str | None, converter: Callable[[str], U]) -> U | None:
Author	SHA1	Message	Date
Danielle McLean	ca5086f93a	Fix path to MPD logo in Cocoa receiver (oops)	2024-07-13 18:38:16 +10:00
Danielle McLean	582a4628b7	Introduce new WebSockets receiver impl When enabled, this new receiver will spin up a local WebSockets server and will send the currently playing song information to any clients that connect. It's designed with Übersicht in mind, since WebSockets is the easiest way to efficiently push events into an Übersicht widget, but I'm sure it'd work for a variety of other purposes too. Currently the socket is only used in one direction, pushing the current song info from server to client, but I'll probably extend it to support sending MPD commands from WebSockets clients as well.	2024-07-13 18:34:53 +10:00
Danielle McLean	75206a97f1	Add extra for websockets support	2024-07-11 12:17:09 +10:00
Danielle McLean	04859b8c8b	Adjust receiver protocol to accommodate config	2024-07-11 12:15:34 +10:00
Danielle McLean	09fe3b3e6c	Expand MusicBrainz support to be much more comprehensive	2024-07-11 12:12:56 +10:00
Danielle McLean	60116fd616	Make PyObjC a Darwin-only dependency	2024-07-10 23:57:34 +10:00
Danielle McLean	00ba34bd0b	Refactor Cocoa stuff into a 'receiver' The idea here is that there are other places that might want to know what's playing, besides MPNowPlayingInfoCenter. For example, to expose the now playing info to Übersicht efficiently, it needs to be available from a web browser, ideally using WebSockets. So there could be a receiver that runs a small WebSockets server and sends out now playing info to anyone who connects. Additionally, I hope to write receivers for MPRIS and for the System Media Transport Controls on Windows, making mpd-now-playable equally useful across all platforms. None of this is implemented yet, of course, but I hope to get the WebSockets receiver done pretty soon! I'm going to keep the default behaviour unchanged. Unless you explicitly configure different receivers in config.toml, mpd-now-playable will just behave as an MPNowPlayingInfoCenter integration as it's always done.	2024-07-09 12:52:49 +10:00