mirror of
https://github.com/Adam-Ant/home-assistant
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456 lines
16 KiB
Python
456 lines
16 KiB
Python
# python-mpd: Python MPD client library
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# Copyright (C) 2008-2010 J. Alexander Treuman <jat@spatialrift.net>
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#
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# python-mpd is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# python-mpd is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with python-mpd. If not, see <http://www.gnu.org/licenses/>.
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import socket
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HELLO_PREFIX = "OK MPD "
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ERROR_PREFIX = "ACK "
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SUCCESS = "OK"
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NEXT = "list_OK"
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class MPDError(Exception):
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pass
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class ConnectionError(MPDError):
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pass
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class ProtocolError(MPDError):
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pass
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class CommandError(MPDError):
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pass
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class CommandListError(MPDError):
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pass
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class PendingCommandError(MPDError):
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pass
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class IteratingError(MPDError):
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pass
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class _NotConnected(object):
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def __getattr__(self, attr):
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return self._dummy
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def _dummy(*args):
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raise ConnectionError("Not connected")
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class MPDClient(object):
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def __init__(self):
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self.iterate = False
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self._reset()
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self._commands = {
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# Status Commands
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"clearerror": self._fetch_nothing,
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"currentsong": self._fetch_object,
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"idle": self._fetch_list,
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"noidle": None,
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"status": self._fetch_object,
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"stats": self._fetch_object,
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# Playback Option Commands
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"consume": self._fetch_nothing,
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"crossfade": self._fetch_nothing,
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"mixrampdb": self._fetch_nothing,
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"mixrampdelay": self._fetch_nothing,
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"random": self._fetch_nothing,
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"repeat": self._fetch_nothing,
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"setvol": self._fetch_nothing,
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"single": self._fetch_nothing,
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"replay_gain_mode": self._fetch_nothing,
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"replay_gain_status": self._fetch_item,
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"volume": self._fetch_nothing,
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# Playback Control Commands
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"next": self._fetch_nothing,
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"pause": self._fetch_nothing,
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"play": self._fetch_nothing,
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"playid": self._fetch_nothing,
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"previous": self._fetch_nothing,
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"seek": self._fetch_nothing,
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"seekid": self._fetch_nothing,
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"stop": self._fetch_nothing,
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# Playlist Commands
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"add": self._fetch_nothing,
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"addid": self._fetch_item,
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"clear": self._fetch_nothing,
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"delete": self._fetch_nothing,
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"deleteid": self._fetch_nothing,
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"move": self._fetch_nothing,
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"moveid": self._fetch_nothing,
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"playlist": self._fetch_playlist,
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"playlistfind": self._fetch_songs,
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"playlistid": self._fetch_songs,
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"playlistinfo": self._fetch_songs,
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"playlistsearch": self._fetch_songs,
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"plchanges": self._fetch_songs,
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"plchangesposid": self._fetch_changes,
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"shuffle": self._fetch_nothing,
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"swap": self._fetch_nothing,
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"swapid": self._fetch_nothing,
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# Stored Playlist Commands
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"listplaylist": self._fetch_list,
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"listplaylistinfo": self._fetch_songs,
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"listplaylists": self._fetch_playlists,
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"load": self._fetch_nothing,
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"playlistadd": self._fetch_nothing,
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"playlistclear": self._fetch_nothing,
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"playlistdelete": self._fetch_nothing,
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"playlistmove": self._fetch_nothing,
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"rename": self._fetch_nothing,
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"rm": self._fetch_nothing,
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"save": self._fetch_nothing,
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# Database Commands
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"count": self._fetch_object,
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"find": self._fetch_songs,
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"findadd": self._fetch_nothing,
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"list": self._fetch_list,
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"listall": self._fetch_database,
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"listallinfo": self._fetch_database,
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"lsinfo": self._fetch_database,
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"search": self._fetch_songs,
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"update": self._fetch_item,
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"rescan": self._fetch_item,
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# Sticker Commands
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"sticker get": self._fetch_item,
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"sticker set": self._fetch_nothing,
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"sticker delete": self._fetch_nothing,
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"sticker list": self._fetch_list,
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"sticker find": self._fetch_songs,
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# Connection Commands
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"close": None,
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"kill": None,
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"password": self._fetch_nothing,
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"ping": self._fetch_nothing,
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# Audio Output Commands
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"disableoutput": self._fetch_nothing,
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"enableoutput": self._fetch_nothing,
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"outputs": self._fetch_outputs,
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# Reflection Commands
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"commands": self._fetch_list,
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"notcommands": self._fetch_list,
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"tagtypes": self._fetch_list,
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"urlhandlers": self._fetch_list,
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"decoders": self._fetch_plugins,
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}
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def __getattr__(self, attr):
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if attr.startswith("send_"):
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command = attr.replace("send_", "", 1)
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wrapper = self._send
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elif attr.startswith("fetch_"):
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command = attr.replace("fetch_", "", 1)
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wrapper = self._fetch
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else:
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command = attr
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wrapper = self._execute
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if command not in self._commands:
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command = command.replace("_", " ")
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if command not in self._commands:
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raise AttributeError("'%s' object has no attribute '%s'" %
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(self.__class__.__name__, attr))
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return lambda *args: wrapper(command, args)
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def _send(self, command, args):
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if self._command_list is not None:
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raise CommandListError("Cannot use send_%s in a command list" %
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command.replace(" ", "_"))
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self._write_command(command, args)
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retval = self._commands[command]
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if retval is not None:
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self._pending.append(command)
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def _fetch(self, command, args=None):
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if self._command_list is not None:
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raise CommandListError("Cannot use fetch_%s in a command list" %
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command.replace(" ", "_"))
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if self._iterating:
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raise IteratingError("Cannot use fetch_%s while iterating" %
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command.replace(" ", "_"))
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if not self._pending:
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raise PendingCommandError("No pending commands to fetch")
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if self._pending[0] != command:
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raise PendingCommandError("'%s' is not the currently "
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"pending command" % command)
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del self._pending[0]
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retval = self._commands[command]
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if callable(retval):
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return retval()
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return retval
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def _execute(self, command, args):
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if self._iterating:
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raise IteratingError("Cannot execute '%s' while iterating" %
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command)
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if self._pending:
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raise PendingCommandError("Cannot execute '%s' with "
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"pending commands" % command)
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retval = self._commands[command]
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if self._command_list is not None:
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if not callable(retval):
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raise CommandListError("'%s' not allowed in command list" %
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command)
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self._write_command(command, args)
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self._command_list.append(retval)
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else:
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self._write_command(command, args)
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if callable(retval):
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return retval()
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return retval
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def _write_line(self, line):
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self._wfile.write("%s\n" % line)
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self._wfile.flush()
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def _write_command(self, command, args=[]):
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parts = [command]
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for arg in args:
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parts.append('"%s"' % escape(str(arg)))
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self._write_line(" ".join(parts))
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def _read_line(self):
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line = self._rfile.readline()
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if not line.endswith("\n"):
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raise ConnectionError("Connection lost while reading line")
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line = line.rstrip("\n")
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if line.startswith(ERROR_PREFIX):
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error = line[len(ERROR_PREFIX):].strip()
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raise CommandError(error)
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if self._command_list is not None:
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if line == NEXT:
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return
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if line == SUCCESS:
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raise ProtocolError("Got unexpected '%s'" % SUCCESS)
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elif line == SUCCESS:
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return
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return line
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def _read_pair(self, separator):
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line = self._read_line()
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if line is None:
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return
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pair = line.split(separator, 1)
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if len(pair) < 2:
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raise ProtocolError("Could not parse pair: '%s'" % line)
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return pair
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def _read_pairs(self, separator=": "):
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pair = self._read_pair(separator)
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while pair:
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yield pair
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pair = self._read_pair(separator)
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def _read_list(self):
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seen = None
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for key, value in self._read_pairs():
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if key != seen:
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if seen is not None:
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raise ProtocolError("Expected key '%s', got '%s'" %
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(seen, key))
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seen = key
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yield value
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def _read_playlist(self):
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for key, value in self._read_pairs(":"):
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yield value
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def _read_objects(self, delimiters=[]):
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obj = {}
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for key, value in self._read_pairs():
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key = key.lower()
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if obj:
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if key in delimiters:
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yield obj
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obj = {}
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elif key in obj:
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if not isinstance(obj[key], list):
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obj[key] = [obj[key], value]
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else:
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obj[key].append(value)
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continue
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obj[key] = value
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if obj:
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yield obj
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def _read_command_list(self):
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try:
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for retval in self._command_list:
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yield retval()
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finally:
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self._command_list = None
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self._fetch_nothing()
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def _iterator_wrapper(self, iterator):
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try:
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for item in iterator:
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yield item
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finally:
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self._iterating = False
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def _wrap_iterator(self, iterator):
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if not self.iterate:
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return list(iterator)
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self._iterating = True
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return self._iterator_wrapper(iterator)
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def _fetch_nothing(self):
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line = self._read_line()
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if line is not None:
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raise ProtocolError("Got unexpected return value: '%s'" % line)
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def _fetch_item(self):
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pairs = list(self._read_pairs())
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if len(pairs) != 1:
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return
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return pairs[0][1]
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def _fetch_list(self):
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return self._wrap_iterator(self._read_list())
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def _fetch_playlist(self):
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return self._wrap_iterator(self._read_playlist())
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def _fetch_object(self):
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objs = list(self._read_objects())
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if not objs:
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return {}
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return objs[0]
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def _fetch_objects(self, delimiters):
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return self._wrap_iterator(self._read_objects(delimiters))
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def _fetch_changes(self):
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return self._fetch_objects(["cpos"])
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def _fetch_songs(self):
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return self._fetch_objects(["file"])
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def _fetch_playlists(self):
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return self._fetch_objects(["playlist"])
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def _fetch_database(self):
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return self._fetch_objects(["file", "directory", "playlist"])
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def _fetch_outputs(self):
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return self._fetch_objects(["outputid"])
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def _fetch_plugins(self):
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return self._fetch_objects(["plugin"])
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def _fetch_command_list(self):
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return self._wrap_iterator(self._read_command_list())
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def _hello(self):
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line = self._rfile.readline()
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if not line.endswith("\n"):
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raise ConnectionError("Connection lost while reading MPD hello")
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line = line.rstrip("\n")
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if not line.startswith(HELLO_PREFIX):
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raise ProtocolError("Got invalid MPD hello: '%s'" % line)
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self.mpd_version = line[len(HELLO_PREFIX):].strip()
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def _reset(self):
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self.mpd_version = None
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self._iterating = False
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self._pending = []
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self._command_list = None
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self._sock = None
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self._rfile = _NotConnected()
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self._wfile = _NotConnected()
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def _connect_unix(self, path):
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if not hasattr(socket, "AF_UNIX"):
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raise ConnectionError("Unix domain sockets not supported "
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"on this platform")
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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sock.connect(path)
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return sock
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def _connect_tcp(self, host, port):
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try:
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flags = socket.AI_ADDRCONFIG
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except AttributeError:
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flags = 0
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err = None
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for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC,
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socket.SOCK_STREAM, socket.IPPROTO_TCP,
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flags):
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af, socktype, proto, canonname, sa = res
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sock = None
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try:
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sock = socket.socket(af, socktype, proto)
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sock.connect(sa)
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return sock
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except socket.error, err:
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if sock is not None:
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sock.close()
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if err is not None:
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raise err
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else:
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raise ConnectionError("getaddrinfo returns an empty list")
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def connect(self, host, port):
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if self._sock is not None:
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raise ConnectionError("Already connected")
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if host.startswith("/"):
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self._sock = self._connect_unix(host)
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else:
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self._sock = self._connect_tcp(host, port)
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self._rfile = self._sock.makefile("rb")
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self._wfile = self._sock.makefile("wb")
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try:
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self._hello()
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except:
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self.disconnect()
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raise
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def disconnect(self):
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self._rfile.close()
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self._wfile.close()
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self._sock.close()
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self._reset()
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def fileno(self):
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if self._sock is None:
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raise ConnectionError("Not connected")
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return self._sock.fileno()
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def command_list_ok_begin(self):
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if self._command_list is not None:
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raise CommandListError("Already in command list")
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if self._iterating:
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raise IteratingError("Cannot begin command list while iterating")
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if self._pending:
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raise PendingCommandError("Cannot begin command list "
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"with pending commands")
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self._write_command("command_list_ok_begin")
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self._command_list = []
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def command_list_end(self):
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if self._command_list is None:
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raise CommandListError("Not in command list")
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if self._iterating:
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raise IteratingError("Already iterating over a command list")
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self._write_command("command_list_end")
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return self._fetch_command_list()
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def escape(text):
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return text.replace("\\", "\\\\").replace('"', '\\"')
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