1 # python-musicpd: Python MPD client library
2 # Copyright (C) 2012-2021 kaliko <kaliko@azylum.org>
3 # Copyright (C) 2019 Naglis Jonaitis <naglis@mailbox.org>
4 # Copyright (C) 2019 Bart Van Loon <bbb@bbbart.be>
5 # Copyright (C) 2008-2010 J. Alexander Treuman <jat@spatialrift.net>
7 # python-musicpd is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Lesser General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
12 # python-musicpd is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Lesser General Public License for more details.
17 # You should have received a copy of the GNU Lesser General Public License
18 # along with python-musicpd. If not, see <http://www.gnu.org/licenses/>.
20 # pylint: disable=missing-docstring
25 from functools import wraps
27 HELLO_PREFIX = "OK MPD "
32 #: seconds before a tcp connection attempt times out (overriden by MPD_TIMEOUT env. var.)
33 CONNECTION_TIMEOUT = 30
37 def iterator_wrapper(func):
38 """Decorator handling iterate option"""
40 def decorated_function(instance, *args, **kwargs):
41 generator = func(instance, *args, **kwargs)
42 if not instance.iterate:
43 return list(generator)
44 instance._iterating = True
51 instance._iterating = False
52 return iterator(generator)
53 return decorated_function
56 class MPDError(Exception):
60 class ConnectionError(MPDError):
64 class ProtocolError(MPDError):
68 class CommandError(MPDError):
72 class CommandListError(MPDError):
76 class PendingCommandError(MPDError):
80 class IteratingError(MPDError):
86 def __init__(self, tpl):
91 if len(self.tpl) == 0:
93 if len(self.tpl) == 1:
94 return '{0}:'.format(self.tpl[0])
95 return '{0[0]}:{0[1]}'.format(self.tpl)
98 return 'Range({0})'.format(self.tpl)
101 if not isinstance(self.tpl, tuple):
102 raise CommandError('Wrong type, provide a tuple')
103 if len(self.tpl) not in [0, 1, 2]:
104 raise CommandError('length not in [0, 1, 2]')
105 for index in self.tpl:
108 except (TypeError, ValueError):
109 raise CommandError('Not a tuple of int')
114 def __getattr__(self, attr):
118 raise ConnectionError("Not connected")
122 """MPDClient instance will look for ``MPD_HOST``/``MPD_PORT``/``XDG_RUNTIME_DIR`` environment
123 variables and set instance attribute ``host``, ``port`` and ``pwd``
124 accordingly. Regarding ``MPD_HOST`` format to expose password refer
125 MPD client manual :manpage:`mpc (1)`.
127 Then :py:obj:`musicpd.MPDClient.connect` will use ``host`` and ``port`` as defaults if not provided as args.
129 Cf. :py:obj:`musicpd.MPDClient.connect` for details.
131 >>> from os import environ
132 >>> environ['MPD_HOST'] = 'pass@mpdhost'
133 >>> cli = musicpd.MPDClient()
134 >>> cli.pwd == environ['MPD_HOST'].split('@')[0]
136 >>> cli.host == environ['MPD_HOST'].split('@')[1]
138 >>> cli.connect() # will use host/port as set in MPD_HOST/MPD_PORT
140 :ivar str host: host used with the current connection
141 :ivar str,int port: port used with the current connection
142 :ivar str pwd: password detected in ``MPD_HOST`` environment variable
144 .. warning:: Instance attribute host/port/pwd
146 While :py:attr:`musicpd.MPDClient().host` and
147 :py:attr:`musicpd.MPDClient().port` keep track of current connection
148 host and port, :py:attr:`musicpd.MPDClient().pwd` is set once with
149 password extracted from environment variable.
150 Calling :py:meth:`musicpd.MPDClient().password()` with a new password
151 won't update :py:attr:`musicpd.MPDClient().pwd` value.
153 Moreover, :py:attr:`musicpd.MPDClient().pwd` is only an helper attribute
154 exposing password extracted from ``MPD_HOST`` environment variable, it
155 will not be used as default value for the :py:meth:`password` method
163 "clearerror": self._fetch_nothing,
164 "currentsong": self._fetch_object,
165 "idle": self._fetch_list,
167 "status": self._fetch_object,
168 "stats": self._fetch_object,
169 # Playback Option Commands
170 "consume": self._fetch_nothing,
171 "crossfade": self._fetch_nothing,
172 "mixrampdb": self._fetch_nothing,
173 "mixrampdelay": self._fetch_nothing,
174 "random": self._fetch_nothing,
175 "repeat": self._fetch_nothing,
176 "setvol": self._fetch_nothing,
177 "getvol": self._fetch_object,
178 "single": self._fetch_nothing,
179 "replay_gain_mode": self._fetch_nothing,
180 "replay_gain_status": self._fetch_item,
181 "volume": self._fetch_nothing,
182 # Playback Control Commands
183 "next": self._fetch_nothing,
184 "pause": self._fetch_nothing,
185 "play": self._fetch_nothing,
186 "playid": self._fetch_nothing,
187 "previous": self._fetch_nothing,
188 "seek": self._fetch_nothing,
189 "seekid": self._fetch_nothing,
190 "seekcur": self._fetch_nothing,
191 "stop": self._fetch_nothing,
193 "add": self._fetch_nothing,
194 "addid": self._fetch_item,
195 "clear": self._fetch_nothing,
196 "delete": self._fetch_nothing,
197 "deleteid": self._fetch_nothing,
198 "move": self._fetch_nothing,
199 "moveid": self._fetch_nothing,
200 "playlist": self._fetch_playlist,
201 "playlistfind": self._fetch_songs,
202 "playlistid": self._fetch_songs,
203 "playlistinfo": self._fetch_songs,
204 "playlistsearch": self._fetch_songs,
205 "plchanges": self._fetch_songs,
206 "plchangesposid": self._fetch_changes,
207 "prio": self._fetch_nothing,
208 "prioid": self._fetch_nothing,
209 "rangeid": self._fetch_nothing,
210 "shuffle": self._fetch_nothing,
211 "swap": self._fetch_nothing,
212 "swapid": self._fetch_nothing,
213 "addtagid": self._fetch_nothing,
214 "cleartagid": self._fetch_nothing,
215 # Stored Playlist Commands
216 "listplaylist": self._fetch_list,
217 "listplaylistinfo": self._fetch_songs,
218 "listplaylists": self._fetch_playlists,
219 "load": self._fetch_nothing,
220 "playlistadd": self._fetch_nothing,
221 "playlistclear": self._fetch_nothing,
222 "playlistdelete": self._fetch_nothing,
223 "playlistmove": self._fetch_nothing,
224 "rename": self._fetch_nothing,
225 "rm": self._fetch_nothing,
226 "save": self._fetch_nothing,
228 "albumart": self._fetch_composite,
229 "count": self._fetch_object,
230 "getfingerprint": self._fetch_object,
231 "find": self._fetch_songs,
232 "findadd": self._fetch_nothing,
233 "list": self._fetch_list,
234 "listall": self._fetch_database,
235 "listallinfo": self._fetch_database,
236 "listfiles": self._fetch_database,
237 "lsinfo": self._fetch_database,
238 "readcomments": self._fetch_object,
239 "readpicture": self._fetch_composite,
240 "search": self._fetch_songs,
241 "searchadd": self._fetch_nothing,
242 "searchaddpl": self._fetch_nothing,
243 "update": self._fetch_item,
244 "rescan": self._fetch_item,
245 # Mounts and neighbors
246 "mount": self._fetch_nothing,
247 "unmount": self._fetch_nothing,
248 "listmounts": self._fetch_mounts,
249 "listneighbors": self._fetch_neighbors,
251 "sticker get": self._fetch_item,
252 "sticker set": self._fetch_nothing,
253 "sticker delete": self._fetch_nothing,
254 "sticker list": self._fetch_list,
255 "sticker find": self._fetch_songs,
256 # Connection Commands
259 "password": self._fetch_nothing,
260 "ping": self._fetch_nothing,
261 "binarylimit": self._fetch_nothing,
262 "tagtypes": self._fetch_list,
263 "tagtypes disable": self._fetch_nothing,
264 "tagtypes enable": self._fetch_nothing,
265 "tagtypes clear": self._fetch_nothing,
266 "tagtypes all": self._fetch_nothing,
268 "partition": self._fetch_nothing,
269 "listpartitions": self._fetch_list,
270 "newpartition": self._fetch_nothing,
271 "delpartition": self._fetch_nothing,
272 "moveoutput": self._fetch_nothing,
273 # Audio Output Commands
274 "disableoutput": self._fetch_nothing,
275 "enableoutput": self._fetch_nothing,
276 "toggleoutput": self._fetch_nothing,
277 "outputs": self._fetch_outputs,
278 "outputset": self._fetch_nothing,
279 # Reflection Commands
280 "config": self._fetch_object,
281 "commands": self._fetch_list,
282 "notcommands": self._fetch_list,
283 "urlhandlers": self._fetch_list,
284 "decoders": self._fetch_plugins,
286 "subscribe": self._fetch_nothing,
287 "unsubscribe": self._fetch_nothing,
288 "channels": self._fetch_list,
289 "readmessages": self._fetch_messages,
290 "sendmessage": self._fetch_nothing,
294 def _get_envvars(self):
296 Retrieve MPD env. var. to overrides "localhost:6600"
297 Use MPD_HOST/MPD_PORT if set
298 else use MPD_HOST=${XDG_RUNTIME_DIR:-/run/}/mpd/socket if file exists
300 self.host = 'localhost'
302 self.port = os.getenv('MPD_PORT', '6600')
303 if os.getenv('MPD_HOST'):
304 # If password is set: MPD_HOST=pass@host
305 if '@' in os.getenv('MPD_HOST'):
306 mpd_host_env = os.getenv('MPD_HOST').split('@', 1)
308 # A password is actually set
309 self.pwd = mpd_host_env[0]
310 self.host = mpd_host_env[1]
312 # No password set but leading @ is an abstract socket
313 self.host = '@'+mpd_host_env[1]
315 # MPD_HOST is a plain host
316 self.host = os.getenv('MPD_HOST')
319 xdg_runtime_dir = os.getenv('XDG_RUNTIME_DIR', '/run')
320 rundir = os.path.join(xdg_runtime_dir, 'mpd/socket')
321 if os.path.exists(rundir):
323 self.mpd_timeout = os.getenv('MPD_TIMEOUT')
324 if self.mpd_timeout and self.mpd_timeout.isdigit():
325 self.mpd_timeout = int(self.mpd_timeout)
326 else: # Use 30s default even is MPD_TIMEOUT carries gargage
327 self.mpd_timeout = CONNECTION_TIMEOUT
329 def __getattr__(self, attr):
330 if attr == 'send_noidle': # have send_noidle to cancel idle as well as noidle
332 if attr.startswith("send_"):
333 command = attr.replace("send_", "", 1)
335 elif attr.startswith("fetch_"):
336 command = attr.replace("fetch_", "", 1)
337 wrapper = self._fetch
340 wrapper = self._execute
341 if command not in self._commands:
342 command = command.replace("_", " ")
343 if command not in self._commands:
344 raise AttributeError("'%s' object has no attribute '%s'" %
345 (self.__class__.__name__, attr))
346 return lambda *args: wrapper(command, args)
348 def _send(self, command, args):
349 if self._command_list is not None:
350 raise CommandListError("Cannot use send_%s in a command list" %
351 command.replace(" ", "_"))
352 self._write_command(command, args)
353 retval = self._commands[command]
354 if retval is not None:
355 self._pending.append(command)
357 def _fetch(self, command, args=None):
358 if self._command_list is not None:
359 raise CommandListError("Cannot use fetch_%s in a command list" %
360 command.replace(" ", "_"))
362 raise IteratingError("Cannot use fetch_%s while iterating" %
363 command.replace(" ", "_"))
364 if not self._pending:
365 raise PendingCommandError("No pending commands to fetch")
366 if self._pending[0] != command:
367 raise PendingCommandError("'%s' is not the currently "
368 "pending command" % command)
370 retval = self._commands[command]
375 def _execute(self, command, args):
377 raise IteratingError("Cannot execute '%s' while iterating" %
380 raise PendingCommandError(
381 "Cannot execute '%s' with pending commands" % command)
382 retval = self._commands[command]
383 if self._command_list is not None:
384 if not callable(retval):
385 raise CommandListError(
386 "'%s' not allowed in command list" % command)
387 self._write_command(command, args)
388 self._command_list.append(retval)
390 self._write_command(command, args)
395 def _write_line(self, line):
396 self._wfile.write("%s\n" % line)
399 def _write_command(self, command, args=None):
404 if isinstance(arg, tuple):
405 parts.append('{0!s}'.format(Range(arg)))
407 parts.append('"%s"' % escape(str(arg)))
408 self._write_line(" ".join(parts))
410 def _read_binary(self, amount):
413 result = self._rbfile.read(amount)
416 raise ConnectionError("Connection lost while reading binary content")
418 amount -= len(result)
421 def _read_line(self, binary=False):
423 line = self._rbfile.readline().decode('utf-8')
425 line = self._rfile.readline()
426 if not line.endswith("\n"):
428 raise ConnectionError("Connection lost while reading line")
429 line = line.rstrip("\n")
430 if line.startswith(ERROR_PREFIX):
431 error = line[len(ERROR_PREFIX):].strip()
432 raise CommandError(error)
433 if self._command_list is not None:
437 raise ProtocolError("Got unexpected '%s'" % SUCCESS)
438 elif line == SUCCESS:
442 def _read_pair(self, separator, binary=False):
443 line = self._read_line(binary=binary)
446 pair = line.split(separator, 1)
448 raise ProtocolError("Could not parse pair: '%s'" % line)
451 def _read_pairs(self, separator=": ", binary=False):
452 pair = self._read_pair(separator, binary=binary)
455 pair = self._read_pair(separator, binary=binary)
457 def _read_list(self):
459 for key, value in self._read_pairs():
462 raise ProtocolError("Expected key '%s', got '%s'" %
467 def _read_playlist(self):
468 for _, value in self._read_pairs(":"):
471 def _read_objects(self, delimiters=None):
473 if delimiters is None:
475 for key, value in self._read_pairs():
478 if key in delimiters:
482 if not isinstance(obj[key], list):
483 obj[key] = [obj[key], value]
485 obj[key].append(value)
491 def _read_command_list(self):
493 for retval in self._command_list:
496 self._command_list = None
497 self._fetch_nothing()
499 def _fetch_nothing(self):
500 line = self._read_line()
502 raise ProtocolError("Got unexpected return value: '%s'" % line)
504 def _fetch_item(self):
505 pairs = list(self._read_pairs())
511 def _fetch_list(self):
512 return self._read_list()
515 def _fetch_playlist(self):
516 return self._read_playlist()
518 def _fetch_object(self):
519 objs = list(self._read_objects())
525 def _fetch_objects(self, delimiters):
526 return self._read_objects(delimiters)
528 def _fetch_changes(self):
529 return self._fetch_objects(["cpos"])
531 def _fetch_songs(self):
532 return self._fetch_objects(["file"])
534 def _fetch_playlists(self):
535 return self._fetch_objects(["playlist"])
537 def _fetch_database(self):
538 return self._fetch_objects(["file", "directory", "playlist"])
540 def _fetch_outputs(self):
541 return self._fetch_objects(["outputid"])
543 def _fetch_plugins(self):
544 return self._fetch_objects(["plugin"])
546 def _fetch_messages(self):
547 return self._fetch_objects(["channel"])
549 def _fetch_mounts(self):
550 return self._fetch_objects(["mount"])
552 def _fetch_neighbors(self):
553 return self._fetch_objects(["neighbor"])
555 def _fetch_composite(self):
557 for key, value in self._read_pairs(binary=True):
563 # If the song file was recognized, but there is no picture, the
564 # response is successful, but is otherwise empty.
566 amount = int(obj['binary'])
568 obj['data'] = self._read_binary(amount)
569 except IOError as err:
570 raise ConnectionError('Error reading binary content: %s' % err)
571 if len(obj['data']) != amount:
572 raise ConnectionError('Error reading binary content: '
573 'Expects %sB, got %s' % (amount, len(obj['data'])))
574 # Fetches trailing new line
575 self._read_line(binary=True)
576 # Fetches SUCCESS code
577 self._read_line(binary=True)
581 def _fetch_command_list(self):
582 return self._read_command_list()
585 line = self._rfile.readline()
586 if not line.endswith("\n"):
587 raise ConnectionError("Connection lost while reading MPD hello")
588 line = line.rstrip("\n")
589 if not line.startswith(HELLO_PREFIX):
590 raise ProtocolError("Got invalid MPD hello: '%s'" % line)
591 self.mpd_version = line[len(HELLO_PREFIX):].strip()
594 self.mpd_version = None
595 self._iterating = False
597 self._command_list = None
599 self._rfile = _NotConnected()
600 self._rbfile = _NotConnected()
601 self._wfile = _NotConnected()
603 def _connect_unix(self, path):
604 if not hasattr(socket, "AF_UNIX"):
605 raise ConnectionError(
606 "Unix domain sockets not supported on this platform")
608 if path.startswith('@'):
610 sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
614 def _connect_tcp(self, host, port):
616 flags = socket.AI_ADDRCONFIG
617 except AttributeError:
620 for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC,
621 socket.SOCK_STREAM, socket.IPPROTO_TCP,
623 af, socktype, proto, _, sa = res
626 sock = socket.socket(af, socktype, proto)
627 sock.settimeout(self.mpd_timeout)
629 sock.settimeout(None)
631 except socket.error as socket_err:
636 raise ConnectionError(str(err))
638 raise ConnectionError("getaddrinfo returns an empty list")
641 # noidle's special case
642 if not self._pending or self._pending[0] != 'idle':
644 'cannot send noidle if send_idle was not called')
646 self._write_command("noidle")
647 return self._fetch_list()
649 def connect(self, host=None, port=None):
650 """Connects the MPD server
652 :param str host: hostname, IP or FQDN (defaults to `localhost` or socket, see below for details)
653 :param port: port number (defaults to 6600)
654 :type port: str or int
656 The connect method honors MPD_HOST/MPD_PORT environment variables.
658 The underlying tcp socket also honors MPD_TIMEOUT environment variable
659 and defaults to :py:obj:`musicpd.CONNECTION_TIMEOUT`.
661 .. note:: Default host/port
663 If host evaluate to :py:obj:`False`
664 * use ``MPD_HOST`` environment variable if set, extract password if present,
665 * else looks for a existing file in ``${XDG_RUNTIME_DIR:-/run/}/mpd/socket``
666 * else set host to ``localhost``
668 If port evaluate to :py:obj:`False`
669 * if ``MPD_PORT`` environment variable is set, use it for port
680 if self._sock is not None:
681 raise ConnectionError("Already connected")
682 if host[0] in ['/', '@']:
683 self._sock = self._connect_unix(host)
685 self._sock = self._connect_tcp(host, port)
686 self._rfile = self._sock.makefile("r", encoding='utf-8', errors='surrogateescape')
687 self._rbfile = self._sock.makefile("rb")
688 self._wfile = self._sock.makefile("w", encoding='utf-8')
695 def disconnect(self):
696 """Closes the MPD connection.
697 The client closes the actual socket, it does not use the
698 'close' request from MPD protocol (as suggested in documentation).
700 if hasattr(self._rfile, 'close'):
702 if hasattr(self._rbfile, 'close'):
704 if hasattr(self._wfile, 'close'):
706 if hasattr(self._sock, 'close'):
711 if self._sock is None:
712 raise ConnectionError("Not connected")
713 return self._sock.fileno()
715 def command_list_ok_begin(self):
716 if self._command_list is not None:
717 raise CommandListError("Already in command list")
719 raise IteratingError("Cannot begin command list while iterating")
721 raise PendingCommandError("Cannot begin command list "
722 "with pending commands")
723 self._write_command("command_list_ok_begin")
724 self._command_list = []
726 def command_list_end(self):
727 if self._command_list is None:
728 raise CommandListError("Not in command list")
730 raise IteratingError("Already iterating over a command list")
731 self._write_command("command_list_end")
732 return self._fetch_command_list()
736 return text.replace("\\", "\\\\").replace('"', '\\"')
738 # vim: set expandtab shiftwidth=4 softtabstop=4 textwidth=79: