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# Copyright 2015 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
""" Registers all known signal emitters
"""
import logging
import types
import urwid
log = logging.getLogger('subiquity.signals')
class SignalException(Exception):
"Problem with a signal"
class Signal:
known_signals = []
def register_signals(self, signals):
if type(signals) is list:
self.known_signals.extend(signals)
else:
self.known_signals.append(signals)
urwid.register_signal(Signal, self.known_signals)
def emit_signal(self, name, *args, **kwargs):
urwid.emit_signal(self, name, *args, **kwargs)
def connect_signal(self, name, cb):
if isinstance(cb, types.MethodType):
scb = "{}.{}".format(
cb.__self__.__class__.__name__, cb.__func__.__name__)
else:
scb = str(cb)
log.debug("connect_signal: %s -> %s", name, scb)
urwid.connect_signal(self, name, cb)
def connect_signals(self, signal_callback):
""" Connects a batch of signals
:param list signal_callback: List of tuples eg. ('signame', self.cb)
"""
if not type(signal_callback) is list:
raise SignalException(
"Passed something other than a required list.")
for sig, cb in signal_callback:
if sig not in self.known_signals:
self.register_signals(sig)
self.connect_signal(sig, cb)