1 # -*- coding: utf-8 -*-
3 # python-musicpd: Python MPD client library
4 # Copyright (C) 2014-2015 Kaliko Jack <kaliko@azylum.org>
6 # python-musicpdasio is free software: you can redistribute it and/or modify
7 # it under the terms of the GNU Lesser General Public License as published by
8 # the Free Software Foundation, either version 3 of the License, or
9 # (at your option) any later version.
11 # python-musicpd is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU Lesser General Public License for more details.
16 # You should have received a copy of the GNU Lesser General Public License
17 # along with python-musicpd. If not, see <http://www.gnu.org/licenses/>.
23 print('Failed to import asyncio, need python >= 3.4')
28 from os import environ
29 if 'DEBUG' in environ or 'PYTHONASYNCIODEBUG' in environ:
30 logging.basicConfig(level=logging.DEBUG)
32 HELLO_PREFIX = "OK MPD "
39 class MPDError(Exception):
42 class ConnectionError(MPDError):
45 class ProtocolError(MPDError):
48 class CommandError(MPDError):
51 class CommandListError(MPDError):
54 class PendingCommandError(MPDError):
57 class IteratingError(MPDError):
67 return '"{0}…" ({1})'.format(
68 ' '.join(self.resp.split('\n')[:2]),
71 class MPDProto(asyncio.Protocol):
72 def __init__(self, future, payload, pwd):
76 self.payload = payload
77 self.sess = Response()
79 def connection_made(self, transport):
80 self.transport = transport
81 self.transport.write(bytes('{}\n'.format(self.payload), 'utf-8'))
83 def eof_received(self):
84 self.transport.close()
85 err = ConnectionError('Connection lost while reading line')
86 self.future.set_exception(err)
88 def data_received(self, data):
89 #logging.debug(data.decode('utf-8'))
90 rcv = self._hello(data.decode('utf-8'))
92 if rcv.startswith(ERROR_PREFIX):
93 err = rcv[len(ERROR_PREFIX):].strip()
94 self.future.set_exception(CommandError(err))
97 if rcv.endswith(SUCCESS+'\n'):
99 self.sess.resp = self.sess.resp[:len(SUCCESS+'\n')*-1]
100 logging.debug('set future result')
101 self.transport.close()
102 self.future.set_result(self.sess)
104 def _hello(self, rcv):
105 """Consume HELLO_PREFIX"""
106 if rcv.startswith(HELLO_PREFIX):
107 logging.debug('consumed hello prefix')
108 self.sess.version = rcv.split('\n')[0][len(HELLO_PREFIX):]
109 return rcv[rcv.find('\n')+1:]
114 def __init__(self, host='localhost', port=6600, passwd=None):
115 self._evloop = asyncio.get_event_loop()
127 def __getattr__(self, attr):
130 wrapper = self._command
131 if command not in self._commands:
132 command = command.replace("_", " ")
133 if command not in self._commands:
134 raise AttributeError("'%s' object has no attribute '%s'" %
135 (self.__class__.__name__, attr))
136 return lambda *args: wrapper(command, args)
139 def _connect(self, proto):
140 # coroutine allowing Exception handling
141 # src: http://comments.gmane.org/gmane.comp.python.tulip/1401
143 yield from self._evloop.create_connection(lambda: proto,
146 except Exception as err:
147 proto.future.set_exception(ConnectionError(err))
149 def _command(self, command, args):
150 payload = '{} {}'.format(command, ''.join(args))
151 future = asyncio.Future()
152 # kick off a task to create the connection to MPD
153 coro = self._connect(MPDProto(future, payload, self._pwd))
155 self.futures.append(future)
157 # return once completed.
158 self._evloop.run_until_complete(future)
160 # alternative w/ callback
162 # future.add_done_callback(lambda ftr: MPDClient.loop.stop())
163 # self._evloop.run_forever()
167 """Run event loop gathering tasks from self.futures
170 self._evloop.run_until_complete(asyncio.gather(*self.futures))
173 logging.info('No task found in queue, need to set self.asio?')