1 # python-mpd: Python MPD client library
2 # Copyright (C) 2008-2010 J. Alexander Treuman <jat@spatialrift.net>
4 # python-mpd is free software: you can redistribute it and/or modify
5 # it under the terms of the GNU Lesser General Public License as published by
6 # the Free Software Foundation, either version 3 of the License, or
7 # (at your option) any later version.
9 # python-mpd is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU Lesser General Public License for more details.
14 # You should have received a copy of the GNU Lesser General Public License
15 # along with python-mpd. If not, see <http://www.gnu.org/licenses/>.
20 HELLO_PREFIX = "OK MPD "
26 class MPDError(Exception):
29 class ConnectionError(MPDError):
32 class ProtocolError(MPDError):
35 class CommandError(MPDError):
38 class CommandListError(MPDError):
41 class PendingCommandError(MPDError):
44 class IteratingError(MPDError):
48 class _NotConnected(object):
49 def __getattr__(self, attr):
53 raise ConnectionError("Not connected")
55 class MPDClient(object):
61 "clearerror": self._fetch_nothing,
62 "currentsong": self._fetch_object,
63 "idle": self._fetch_list,
65 "status": self._fetch_object,
66 "stats": self._fetch_object,
67 # Playback Option Commands
68 "consume": self._fetch_nothing,
69 "crossfade": self._fetch_nothing,
70 "mixrampdb": self._fetch_nothing,
71 "mixrampdelay": self._fetch_nothing,
72 "random": self._fetch_nothing,
73 "repeat": self._fetch_nothing,
74 "setvol": self._fetch_nothing,
75 "single": self._fetch_nothing,
76 "replay_gain_mode": self._fetch_nothing,
77 "replay_gain_status": self._fetch_item,
78 "volume": self._fetch_nothing,
79 # Playback Control Commands
80 "next": self._fetch_nothing,
81 "pause": self._fetch_nothing,
82 "play": self._fetch_nothing,
83 "playid": self._fetch_nothing,
84 "previous": self._fetch_nothing,
85 "seek": self._fetch_nothing,
86 "seekid": self._fetch_nothing,
87 "stop": self._fetch_nothing,
89 "add": self._fetch_nothing,
90 "addid": self._fetch_item,
91 "clear": self._fetch_nothing,
92 "delete": self._fetch_nothing,
93 "deleteid": self._fetch_nothing,
94 "move": self._fetch_nothing,
95 "moveid": self._fetch_nothing,
96 "playlist": self._fetch_playlist,
97 "playlistfind": self._fetch_songs,
98 "playlistid": self._fetch_songs,
99 "playlistinfo": self._fetch_songs,
100 "playlistsearch": self._fetch_songs,
101 "plchanges": self._fetch_songs,
102 "plchangesposid": self._fetch_changes,
103 "shuffle": self._fetch_nothing,
104 "swap": self._fetch_nothing,
105 "swapid": self._fetch_nothing,
106 # Stored Playlist Commands
107 "listplaylist": self._fetch_list,
108 "listplaylistinfo": self._fetch_songs,
109 "listplaylists": self._fetch_playlists,
110 "load": self._fetch_nothing,
111 "playlistadd": self._fetch_nothing,
112 "playlistclear": self._fetch_nothing,
113 "playlistdelete": self._fetch_nothing,
114 "playlistmove": self._fetch_nothing,
115 "rename": self._fetch_nothing,
116 "rm": self._fetch_nothing,
117 "save": self._fetch_nothing,
119 "count": self._fetch_object,
120 "find": self._fetch_songs,
121 "findadd": self._fetch_nothing,
122 "list": self._fetch_list,
123 "listall": self._fetch_database,
124 "listallinfo": self._fetch_database,
125 "lsinfo": self._fetch_database,
126 "search": self._fetch_songs,
127 "update": self._fetch_item,
128 "rescan": self._fetch_item,
130 "sticker get": self._fetch_item,
131 "sticker set": self._fetch_nothing,
132 "sticker delete": self._fetch_nothing,
133 "sticker list": self._fetch_list,
134 "sticker find": self._fetch_songs,
135 # Connection Commands
138 "password": self._fetch_nothing,
139 "ping": self._fetch_nothing,
140 # Audio Output Commands
141 "disableoutput": self._fetch_nothing,
142 "enableoutput": self._fetch_nothing,
143 "outputs": self._fetch_outputs,
144 # Reflection Commands
145 "commands": self._fetch_list,
146 "notcommands": self._fetch_list,
147 "tagtypes": self._fetch_list,
148 "urlhandlers": self._fetch_list,
149 "decoders": self._fetch_plugins,
152 def __getattr__(self, attr):
153 if attr.startswith("send_"):
154 command = attr.replace("send_", "", 1)
156 elif attr.startswith("fetch_"):
157 command = attr.replace("fetch_", "", 1)
158 wrapper = self._fetch
161 wrapper = self._execute
162 if command not in self._commands:
163 command = command.replace("_", " ")
164 if command not in self._commands:
165 raise AttributeError("'%s' object has no attribute '%s'" %
166 (self.__class__.__name__, attr))
167 return lambda *args: wrapper(command, args)
169 def _send(self, command, args):
170 if self._command_list is not None:
171 raise CommandListError("Cannot use send_%s in a command list" %
172 command.replace(" ", "_"))
173 self._write_command(command, args)
174 self._pending.append(command)
176 def _fetch(self, command, args=None):
177 if self._command_list is not None:
178 raise CommandListError("Cannot use fetch_%s in a command list" %
179 command.replace(" ", "_"))
181 raise IteratingError("Cannot use fetch_%s while iterating" %
182 command.replace(" ", "_"))
183 if not self._pending:
184 raise PendingCommandError("No pending commands to fetch")
185 if self._pending[0] != command:
186 raise PendingCommandError("'%s' is not the currently "
187 "pending command" % command)
189 retval = self._commands[command]
193 def _execute(self, command, args):
195 raise IteratingError("Cannot execute '%s' while iterating" %
198 raise PendingCommandError("Cannot execute '%s' with "
199 "pending commands" % command)
200 retval = self._commands[command]
201 if self._command_list is not None:
202 if not callable(retval):
203 raise CommandListError("'%s' not allowed in command list" %
205 self._write_command(command, args)
206 self._command_list.append(retval)
208 self._write_command(command, args)
213 def _write_line(self, line):
214 self._wfile.write("%s\n" % line)
217 def _write_command(self, command, args=[]):
220 parts.append('"%s"' % escape(str(arg)))
221 self._write_line(" ".join(parts))
223 def _read_line(self):
224 line = self._rfile.readline()
225 if not line.endswith("\n"):
226 raise ConnectionError("Connection lost while reading line")
227 line = line.rstrip("\n")
228 if line.startswith(ERROR_PREFIX):
229 error = line[len(ERROR_PREFIX):].strip()
230 raise CommandError(error)
231 if self._command_list is not None:
235 raise ProtocolError("Got unexpected '%s'" % SUCCESS)
236 elif line == SUCCESS:
240 def _read_pair(self, separator):
241 line = self._read_line()
244 pair = line.split(separator, 1)
246 raise ProtocolError("Could not parse pair: '%s'" % line)
249 def _read_pairs(self, separator=": "):
250 pair = self._read_pair(separator)
253 pair = self._read_pair(separator)
255 def _read_list(self):
257 for key, value in self._read_pairs():
260 raise ProtocolError("Expected key '%s', got '%s'" %
265 def _read_playlist(self):
266 for key, value in self._read_pairs(":"):
269 def _read_objects(self, delimiters=[]):
271 for key, value in self._read_pairs():
274 if key in delimiters:
278 if not isinstance(obj[key], list):
279 obj[key] = [obj[key], value]
281 obj[key].append(value)
287 def _read_command_list(self):
289 for retval in self._command_list:
292 self._command_list = None
293 self._fetch_nothing()
295 def _iterator_wrapper(self, iterator):
297 for item in iterator:
300 self._iterating = False
302 def _wrap_iterator(self, iterator):
304 return list(iterator)
305 self._iterating = True
306 return self._iterator_wrapper(iterator)
308 def _fetch_nothing(self):
309 line = self._read_line()
311 raise ProtocolError("Got unexpected return value: '%s'" % line)
313 def _fetch_item(self):
314 pairs = list(self._read_pairs())
319 def _fetch_list(self):
320 return self._wrap_iterator(self._read_list())
322 def _fetch_playlist(self):
323 return self._wrap_iterator(self._read_playlist())
325 def _fetch_object(self):
326 objs = list(self._read_objects())
331 def _fetch_objects(self, delimiters):
332 return self._wrap_iterator(self._read_objects(delimiters))
334 def _fetch_changes(self):
335 return self._fetch_objects(["cpos"])
337 def _fetch_songs(self):
338 return self._fetch_objects(["file"])
340 def _fetch_playlists(self):
341 return self._fetch_objects(["playlist"])
343 def _fetch_database(self):
344 return self._fetch_objects(["file", "directory", "playlist"])
346 def _fetch_outputs(self):
347 return self._fetch_objects(["outputid"])
349 def _fetch_plugins(self):
350 return self._fetch_objects(["plugin"])
352 def _fetch_command_list(self):
353 return self._wrap_iterator(self._read_command_list())
356 line = self._rfile.readline()
357 if not line.endswith("\n"):
358 raise ConnectionError("Connection lost while reading MPD hello")
359 line = line.rstrip("\n")
360 if not line.startswith(HELLO_PREFIX):
361 raise ProtocolError("Got invalid MPD hello: '%s'" % line)
362 self.mpd_version = line[len(HELLO_PREFIX):].strip()
365 self.mpd_version = None
366 self._iterating = False
368 self._command_list = None
370 self._rfile = _NotConnected()
371 self._wfile = _NotConnected()
373 def _connect_unix(self, path):
374 if not hasattr(socket, "AF_UNIX"):
375 raise ConnectionError("Unix domain sockets not supported "
377 sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
381 def _connect_tcp(self, host, port):
383 flags = socket.AI_ADDRCONFIG
384 except AttributeError:
387 for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC,
388 socket.SOCK_STREAM, socket.IPPROTO_TCP,
390 af, socktype, proto, canonname, sa = res
393 sock = socket.socket(af, socktype, proto)
396 except socket.error, err:
402 raise ConnectionError("getaddrinfo returns an empty list")
404 def connect(self, host, port):
405 if self._sock is not None:
406 raise ConnectionError("Already connected")
407 if host.startswith("/"):
408 self._sock = self._connect_unix(host)
410 self._sock = self._connect_tcp(host, port)
411 self._rfile = self._sock.makefile("rb")
412 self._wfile = self._sock.makefile("wb")
419 def disconnect(self):
426 if self._sock is None:
427 raise ConnectionError("Not connected")
428 return self._sock.fileno()
430 def command_list_ok_begin(self):
431 if self._command_list is not None:
432 raise CommandListError("Already in command list")
434 raise IteratingError("Cannot begin command list while iterating")
436 raise PendingCommandError("Cannot begin command list "
437 "with pending commands")
438 self._write_command("command_list_ok_begin")
439 self._command_list = []
441 def command_list_end(self):
442 if self._command_list is None:
443 raise CommandListError("Not in command list")
445 raise IteratingError("Already iterating over a command list")
446 self._write_command("command_list_end")
447 return self._fetch_command_list()
451 return text.replace("\\", "\\\\").replace('"', '\\"')
454 # vim: set expandtab shiftwidth=4 softtabstop=4 textwidth=79: