mpdaio/client.py

   1 # -*- coding: utf-8 -*-
   2 # SPDX-FileCopyrightText: 2012-2024  kaliko <kaliko@azylum.org>
   3 # SPDX-License-Identifier: LGPL-3.0-or-later
   4
   5 import logging
   6 import os
   7
   8 from .connection import ConnectionPool, Connection
   9 from .exceptions import MPDConnectionError, MPDProtocolError, MPDCommandError
  10 from .utils import Range, escape
  11
  12 from . import CONNECTION_MAX, CONNECTION_TIMEOUT
  13 from . import ERROR_PREFIX, SUCCESS, NEXT
  14
  15 log = logging.getLogger(__name__)
  16
  17
  18 class MPDClient:
  19
  20     def __init__(self, host: str | None = None, port: str | int | None = None, password: str | None = None):
  21         self._pool = ConnectionPool(max_connections=CONNECTION_MAX)
  22         self._get_envvars()
  23         #: host used with the current connection (:py:obj:`str`)
  24         self.host = host or self.server_discovery[0]
  25         #: password detected in :envvar:`MPD_HOST` environment variable (:py:obj:`str`)
  26         self.password = password or self.server_discovery[2]
  27         #: port used with the current connection (:py:obj:`int`, :py:obj:`str`)
  28         self.port = port or self.server_discovery[1]
  29         log.info('logger : "%s"', __name__)
  30         #: Protocol version
  31         self.version: [None, str] = None
  32         self.mpd_timeout = CONNECTION_TIMEOUT
  33
  34     def _get_envvars(self):
  35         """
  36         Retrieve MPD env. var. to overrides default "localhost:6600"
  37         """
  38         # Set some defaults
  39         disco_host = 'localhost'
  40         disco_port = os.getenv('MPD_PORT', '6600')
  41         pwd = None
  42         _host = os.getenv('MPD_HOST', '')
  43         if _host:
  44             # If password is set: MPD_HOST=pass@host
  45             if '@' in _host:
  46                 mpd_host_env = _host.split('@', 1)
  47                 if mpd_host_env[0]:
  48                     # A password is actually set
  49                     log.debug(
  50                         'password detected in MPD_HOST, set client pwd attribute')
  51                     pwd = mpd_host_env[0]
  52                     if mpd_host_env[1]:
  53                         disco_host = mpd_host_env[1]
  54                         log.debug('host detected in MPD_HOST: %s', disco_host)
  55                 elif mpd_host_env[1]:
  56                     # No password set but leading @ is an abstract socket
  57                     disco_host = '@'+mpd_host_env[1]
  58                     log.debug(
  59                         'host detected in MPD_HOST: %s (abstract socket)', disco_host)
  60             else:
  61                 # MPD_HOST is a plain host
  62                 disco_host = _host
  63                 log.debug('host detected in MPD_HOST: %s', disco_host)
  64         else:
  65             # Is socket there
  66             xdg_runtime_dir = os.getenv('XDG_RUNTIME_DIR', '/run')
  67             rundir = os.path.join(xdg_runtime_dir, 'mpd/socket')
  68             if os.path.exists(rundir):
  69                 disco_host = rundir
  70                 log.debug(
  71                     'host detected in ${XDG_RUNTIME_DIR}/run: %s (unix socket)', disco_host)
  72         _mpd_timeout = os.getenv('MPD_TIMEOUT', '')
  73         if _mpd_timeout.isdigit():
  74             self.mpd_timeout = int(_mpd_timeout)
  75             log.debug('timeout detected in MPD_TIMEOUT: %d', self.mpd_timeout)
  76         else:  # Use CONNECTION_TIMEOUT as default even if MPD_TIMEOUT carries gargage
  77             self.mpd_timeout = CONNECTION_TIMEOUT
  78         self.server_discovery = (disco_host, disco_port, pwd)
  79
  80     def __getattr__(self, attr):
  81         command = attr
  82         wrapper = CmdHandler(self._pool, self.host, self.port, self.password, self.mpd_timeout)
  83         if command not in wrapper._commands:
  84             command = command.replace("_", " ")
  85             if command not in wrapper._commands:
  86                 raise AttributeError(
  87                     f"'CmdHandler' object has no attribute '{attr}'")
  88         return lambda *args: wrapper(command, args)
  89
  90     async def close(self):
  91         await self._pool.close()
  92
  93
  94 class CmdHandler:
  95     #TODO: CmdHandler to intanciate in place of MPDClient._execute
  96     # The MPDClient.__getattr__ wrapper should instanciate an CmdHandler object
  97
  98     def __init__(self, pool, server, port, password, timeout):
  99         self._commands = {
 100             # Status Commands
 101             "clearerror":         self._fetch_nothing,
 102             "currentsong":        self._fetch_object,
 103             "idle":               self._fetch_list,
 104             # "noidle":             None,
 105             "status":             self._fetch_object,
 106             "stats":              self._fetch_object,
 107             # Playback Option Commands
 108             "consume":            self._fetch_nothing,
 109             "crossfade":          self._fetch_nothing,
 110             "mixrampdb":          self._fetch_nothing,
 111             "mixrampdelay":       self._fetch_nothing,
 112             "random":             self._fetch_nothing,
 113             "repeat":             self._fetch_nothing,
 114             "setvol":             self._fetch_nothing,
 115             "getvol":             self._fetch_object,
 116             "single":             self._fetch_nothing,
 117             "replay_gain_mode":   self._fetch_nothing,
 118             "replay_gain_status": self._fetch_item,
 119             "volume":             self._fetch_nothing,
 120             # Playback Control Commands
 121             "next":               self._fetch_nothing,
 122             "pause":              self._fetch_nothing,
 123             "play":               self._fetch_nothing,
 124             "playid":             self._fetch_nothing,
 125             "previous":           self._fetch_nothing,
 126             "seek":               self._fetch_nothing,
 127             "seekid":             self._fetch_nothing,
 128             "seekcur":            self._fetch_nothing,
 129             "stop":               self._fetch_nothing,
 130             # Queue Commands
 131             "add":                self._fetch_nothing,
 132             "addid":              self._fetch_item,
 133             "clear":              self._fetch_nothing,
 134             "delete":             self._fetch_nothing,
 135             "deleteid":           self._fetch_nothing,
 136             "move":               self._fetch_nothing,
 137             "moveid":             self._fetch_nothing,
 138             "playlist":           self._fetch_playlist,
 139             "playlistfind":       self._fetch_songs,
 140             "playlistid":         self._fetch_songs,
 141             "playlistinfo":       self._fetch_songs,
 142             "playlistsearch":     self._fetch_songs,
 143             "plchanges":          self._fetch_songs,
 144             "plchangesposid":     self._fetch_changes,
 145             "prio":               self._fetch_nothing,
 146             "prioid":             self._fetch_nothing,
 147             "rangeid":            self._fetch_nothing,
 148             "shuffle":            self._fetch_nothing,
 149             "swap":               self._fetch_nothing,
 150             "swapid":             self._fetch_nothing,
 151             "addtagid":           self._fetch_nothing,
 152             "cleartagid":         self._fetch_nothing,
 153             # Stored Playlist Commands
 154             "listplaylist":       self._fetch_list,
 155             "listplaylistinfo":   self._fetch_songs,
 156             "listplaylists":      self._fetch_playlists,
 157             "load":               self._fetch_nothing,
 158             "playlistadd":        self._fetch_nothing,
 159             "playlistclear":      self._fetch_nothing,
 160             "playlistdelete":     self._fetch_nothing,
 161             "playlistmove":       self._fetch_nothing,
 162             "rename":             self._fetch_nothing,
 163             "rm":                 self._fetch_nothing,
 164             "save":               self._fetch_nothing,
 165             # Database Commands
 166             "albumart":           self._fetch_composite,
 167             "count":              self._fetch_object,
 168             "getfingerprint":     self._fetch_object,
 169             "find":               self._fetch_songs,
 170             "findadd":            self._fetch_nothing,
 171             "list":               self._fetch_list,
 172             "listall":            self._fetch_database,
 173             "listallinfo":        self._fetch_database,
 174             "listfiles":          self._fetch_database,
 175             "lsinfo":             self._fetch_database,
 176             "readcomments":       self._fetch_object,
 177             "readpicture":        self._fetch_composite,
 178             "search":             self._fetch_songs,
 179             "searchadd":          self._fetch_nothing,
 180             "searchaddpl":        self._fetch_nothing,
 181             "update":             self._fetch_item,
 182             "rescan":             self._fetch_item,
 183             # Mounts and neighbors
 184             "mount":              self._fetch_nothing,
 185             "unmount":            self._fetch_nothing,
 186             "listmounts":         self._fetch_mounts,
 187             "listneighbors":      self._fetch_neighbors,
 188             # Sticker Commands
 189             "sticker get":        self._fetch_item,
 190             "sticker set":        self._fetch_nothing,
 191             "sticker delete":     self._fetch_nothing,
 192             "sticker list":       self._fetch_list,
 193             "sticker find":       self._fetch_songs,
 194             # Connection Commands
 195             "close":              None,
 196             "kill":               None,
 197             "password":           self._fetch_nothing,
 198             "ping":               self._fetch_nothing,
 199             "binarylimit":        self._fetch_nothing,
 200             "tagtypes":           self._fetch_list,
 201             "tagtypes disable":   self._fetch_nothing,
 202             "tagtypes enable":    self._fetch_nothing,
 203             "tagtypes clear":     self._fetch_nothing,
 204             "tagtypes all":       self._fetch_nothing,
 205             # Partition Commands
 206             "partition":          self._fetch_nothing,
 207             "listpartitions":     self._fetch_list,
 208             "newpartition":       self._fetch_nothing,
 209             "delpartition":       self._fetch_nothing,
 210             "moveoutput":         self._fetch_nothing,
 211             # Audio Output Commands
 212             "disableoutput":      self._fetch_nothing,
 213             "enableoutput":       self._fetch_nothing,
 214             "toggleoutput":       self._fetch_nothing,
 215             "outputs":            self._fetch_outputs,
 216             "outputset":          self._fetch_nothing,
 217             # Reflection Commands
 218             "config":             self._fetch_object,
 219             "commands":           self._fetch_list,
 220             "notcommands":        self._fetch_list,
 221             "urlhandlers":        self._fetch_list,
 222             "decoders":           self._fetch_plugins,
 223             # Client to Client
 224             "subscribe":          self._fetch_nothing,
 225             "unsubscribe":        self._fetch_nothing,
 226             "channels":           self._fetch_list,
 227             "readmessages":       self._fetch_messages,
 228             "sendmessage":        self._fetch_nothing,
 229         }
 230         self.command = None
 231         self._command_list = None
 232         self.args = None
 233         self.pool = pool
 234         self.host = (server, port)
 235         self.password = password
 236         self.timeout = timeout
 237         #: current connection
 238         self.connection: [None, Connection] = None
 239
 240     def __repr__(self):
 241         args = [str(_) for _ in self.args]
 242         args = ','.join(args or [])
 243         return f'{self.command}({args})'
 244
 245     async def __call__(self, command: str, args: list | None):
 246         server, port = self.host
 247         self.command = command
 248         self.args = args or ''
 249         self.connection = await self.pool.connect(server, port, timeout=self.timeout)
 250         async with self.connection:
 251             retval = self._commands[command]
 252             await self._write_command(command, args)
 253             if callable(retval):
 254                 log.debug('retvat: %s', retval)
 255                 return await retval()
 256             return retval
 257
 258     async def _write_line(self, line):
 259         self.connection.write(f"{line!s}\n".encode())
 260         await self.connection.drain()
 261
 262     async def _write_command(self, command, args=None):
 263         if args is None:
 264             args = []
 265         parts = [command]
 266         for arg in args:
 267             if isinstance(arg, tuple):
 268                 parts.append(f'{Range(arg)!s}')
 269             else:
 270                 parts.append(f'"{escape(str(arg))}"')
 271         if '\n' in ' '.join(parts):
 272             raise MPDCommandError('new line found in the command!')
 273         #log.debug(' '.join(parts))
 274         await self._write_line(' '.join(parts))
 275
 276     def _read_binary(self, amount):
 277         chunk = bytearray()
 278         while amount > 0:
 279             result = self._rbfile.read(amount)
 280             if len(result) == 0:
 281                 self.disconnect()
 282                 raise ConnectionError(
 283                     "Connection lost while reading binary content")
 284             chunk.extend(result)
 285             amount -= len(result)
 286         return bytes(chunk)
 287
 288     async def _read_line(self, binary=False):
 289         if binary:
 290             line = self._rbfile.readline().decode('utf-8')
 291         else:
 292             line = await self.connection.readline()
 293         line = line.decode('utf-8')
 294         if not line.endswith('\n'):
 295             await self.close()
 296             raise MPDConnectionError("Connection lost while reading line")
 297         line = line.rstrip('\n')
 298         if line.startswith(ERROR_PREFIX):
 299             error = line[len(ERROR_PREFIX):].strip()
 300             raise MPDCommandError(error)
 301         if self._command_list is not None:
 302             if line == NEXT:
 303                 return None
 304             if line == SUCCESS:
 305                 raise MPDProtocolError(f"Got unexpected '{SUCCESS}'")
 306         elif line == SUCCESS:
 307             return None
 308         return line
 309
 310     async def _read_pair(self, separator, binary=False):
 311         line = await self._read_line(binary=binary)
 312         if line is None:
 313             return None
 314         pair = line.split(separator, 1)
 315         if len(pair) < 2:
 316             raise MPDProtocolError(f"Could not parse pair: '{line}'")
 317         return pair
 318
 319     async def _read_pairs(self, separator=": ", binary=False):
 320         """OK"""
 321         pair = await self._read_pair(separator, binary=binary)
 322         while pair:
 323             yield pair
 324             pair = await self._read_pair(separator, binary=binary)
 325
 326     async def _read_list(self):
 327         seen = None
 328         async for key, value in self._read_pairs():
 329             if key != seen:
 330                 if seen is not None:
 331                     raise MPDProtocolError(
 332                         f"Expected key '{seen}', got '{key}'")
 333                 seen = key
 334             yield value
 335
 336     async def _read_playlist(self):
 337         for _, value in await self._read_pairs(":"):
 338             yield value
 339
 340     async def _read_objects(self, delimiters=None):
 341         obj = {}
 342         if delimiters is None:
 343             delimiters = []
 344         async for key, value in self._read_pairs():
 345             key = key.lower()
 346             if obj:
 347                 if key in delimiters:
 348                     yield obj
 349                     obj = {}
 350                 elif key in obj:
 351                     if not isinstance(obj[key], list):
 352                         obj[key] = [obj[key], value]
 353                     else:
 354                         obj[key].append(value)
 355                     continue
 356             obj[key] = value
 357         if obj:
 358             yield obj
 359
 360     def _read_command_list(self):
 361         try:
 362             for retval in self._command_list:
 363                 yield retval()
 364         finally:
 365             self._command_list = None
 366         self._fetch_nothing()
 367
 368     async def _fetch_nothing(self):
 369         line = await self._read_line()
 370         if line is not None:
 371             raise ProtocolError(f"Got unexpected return value: '{line}'")
 372
 373     async def _fetch_item(self):
 374         pairs = [_ async for _ in self._read_pairs()]
 375         if len(pairs) != 1:
 376             return None
 377         return pairs[0][1]
 378
 379     async def _fetch_list(self):
 380         return [_ async for _ in self._read_list()]
 381
 382     def _fetch_playlist(self):
 383         return self._read_playlist()
 384
 385     async def _fetch_object(self):
 386         objs = [obj async for obj in self._read_objects()]
 387         if not objs:
 388             return {}
 389         return objs[0]
 390
 391     async def _fetch_objects(self, delimiters):
 392         return [_ async for _ in self._read_objects(delimiters)]
 393
 394     def _fetch_changes(self):
 395         return self._fetch_objects(["cpos"])
 396
 397     async def _fetch_songs(self):
 398         return await self._fetch_objects(["file"])
 399
 400     def _fetch_playlists(self):
 401         return self._fetch_objects(["playlist"])
 402
 403     def _fetch_database(self):
 404         return self._fetch_objects(["file", "directory", "playlist"])
 405
 406     def _fetch_outputs(self):
 407         return self._fetch_objects(["outputid"])
 408
 409     def _fetch_plugins(self):
 410         return self._fetch_objects(["plugin"])
 411
 412     def _fetch_messages(self):
 413         return self._fetch_objects(["channel"])
 414
 415     def _fetch_mounts(self):
 416         return self._fetch_objects(["mount"])
 417
 418     def _fetch_neighbors(self):
 419         return self._fetch_objects(["neighbor"])
 420
 421     async def _fetch_composite(self):
 422         obj = {}
 423         for key, value in self._read_pairs(binary=True):
 424             key = key.lower()
 425             obj[key] = value
 426             if key == 'binary':
 427                 break
 428         if not obj:
 429             # If the song file was recognized, but there is no picture, the
 430             # response is successful, but is otherwise empty.
 431             return obj
 432         amount = int(obj['binary'])
 433         try:
 434             obj['data'] = self._read_binary(amount)
 435         except IOError as err:
 436             raise ConnectionError(
 437                 f'Error reading binary content: {err}') from err
 438         data_bytes = len(obj['data'])
 439         if data_bytes != amount:  # can we ever get there?
 440             raise ConnectionError('Error reading binary content: '
 441                                   f'Expects {amount}B, got {data_bytes}')
 442         # Fetches trailing new line
 443         await self._read_line(binary=True)
 444         # Fetches SUCCESS code
 445         await self._read_line(binary=True)
 446         return obj
 447
 448     def _fetch_command_list(self):
 449         return self._read_command_list()