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connection.py
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connection.py
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import re
import functools
import mpd
from PySide.QtCore import *
import logging
log = logging.getLogger('qygmy')
class State(QObject):
default = None
changed = None
changed2 = None
def __init__(self):
super().__init__()
self._value = self.normalize(self.default)
@property
def value(self):
return self._value
def update(self, new_value, force=False):
new_value = self.normalize(new_value)
if self._value != new_value or force:
old_value = self._value
self._value = new_value
log.debug('{} changed: {!r} -> {!r}'.format(self.objectName(), old_value, new_value))
self.changed.emit(self._value)
self.changed2.emit(self._value, old_value)
def send(self, value):
pass
def normalize(self, value):
if value is None or value == '':
value = self.default
if isinstance(value, str):
value = value.strip()
if not isinstance(value, type(self.default)):
value = type(self.default)(value)
return value
def prepare(self, value):
return self.normalize(value)
@classmethod
def create(cls, parent, name, init, send_cmd=None):
if not callable(send_cmd):
send_cmd = lambda v, s=send_cmd or name: getattr(parent.conn, s)(v)
class CompleteState(cls):
default = init
changed = Signal(type(init))
changed2 = Signal(type(init), type(init))
def send(self, value):
value = self.prepare(value)
mpd_cmd(lambda p, v: send_cmd(v))(parent, value)
s = CompleteState()
s.setObjectName(name)
s.setParent(parent)
setattr(parent, name, s)
class BoolState(State):
def normalize(self, value):
return value in (True, 1, '1')
def prepare(self, value):
return int(self.normalize(value))
@classmethod
def create(cls, parent, name, init=False, send_cmd=None):
super().create(parent, name, init, send_cmd)
class TimeTupleState(State):
def normalize(self, value):
if isinstance(value, (tuple, list)):
v = [0 if i in ('', None, -1, '-1') else int(i) for i in value]
v = v[:2]
v = v + [0]*(2 - len(v))
return v
return self.default
def prepare(self, value):
return int(value)
class PathState(State):
def normalize(self, value):
v = super().normalize(value)
return v.strip('/')
def mpd_cmd(method=None, *, ignore_conn=False, fallback=None, refresh=True):
if method is None:
def decorator(method):
return mpd_cmd(method, ignore_conn=ignore_conn, fallback=fallback,
refresh=refresh)
return decorator
@functools.wraps(method)
def wrapper(self, *args, **kwargs):
ret = fallback
if self.state.value != 'disconnect' or ignore_conn:
try:
ret = method(self, *args, **kwargs)
except (mpd.MPDError, OSError) as e:
self.handle_error(e)
if refresh:
self.refresh()
return ret
return wrapper
def simple_mpd(name, *args):
return mpd_cmd(lambda self: getattr(self.conn, name)(*args))
def not_callable(*args):
raise TypeError("Not callable")
def mpd_cmdlist_context_manager(connection):
class MPDCommandList:
conn = connection
def __enter__(self):
self.conn.command_list_ok_begin()
return self
def __exit__(self, *exc):
self.retval = self.conn.command_list_end()
return MPDCommandList
class Connection:
MPD_COMMAND_ERROR_RE = re.compile(r'^\[([0-9]+)@([0-9]+)\] \{([^}]*)\} (.*)$')
MAX_MPD_ARGUMENTS = 36
def parse_exception(self, exc):
m = self.MPD_COMMAND_ERROR_RE.match(exc.args[0])
if m is None:
return '', '', '', str(exc)
return m.groups()
def handle_error(self, exc):
if isinstance(exc, (mpd.ConnectionError, mpd.ProtocolError, OSError)):
# Critical errors
try:
self.conn.disconnect()
except Exception as e:
pass
# Needed because it isn't called when socket's close()
# raises an exception (python-mpd2 bug(?)).
self.conn._reset()
self.state.update('disconnect')
log.error('{}: {}'.format(exc.__class__.__name__, exc))
msg = None
if isinstance(exc, mpd.CommandError):
errno, cmdno, cmd, msg = self.parse_exception(exc)
elif isinstance(exc, OSError) and exc.errno is not None:
msg = exc.strerror
elif isinstance(exc, (mpd.ConnectionError, OSError)):
msg = str(exc)
if msg:
self.main.error(msg[0].upper() + msg[1:] + ('.' if msg[-1] != '.' else ''))
class ProperConnection(Connection):
def __init__(self, main):
super().__init__(main)
self.main = main
self.conn = mpd.MPDClient()
self.mpd_cmdlist = mpd_cmdlist_context_manager(self.conn)
State.create(self, 'state', 'disconnect', not_callable)
def refresh(self):
pass
class RelayingConnection(Connection):
def __init__(self, parent):
super().__init__(parent)
self.parent = parent
@property
def main(self):
return self.parent.main
@property
def conn(self):
return self.parent.conn
@property
def mpd_cmdlist(self):
return self.parent.mpd_cmdlist
@property
def state(self):
return self.parent.state
def refresh(self):
self.parent.refresh()