65 lines
2.1 KiB
Python
65 lines
2.1 KiB
Python
# Copyright 2015 Canonical, Ltd.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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""" Registers all known signal emitters
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"""
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import logging
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import types
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import urwid
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log = logging.getLogger('subiquity.signals')
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class SignalException(Exception):
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"Problem with a signal"
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class Signal:
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known_signals = []
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def register_signals(self, signals):
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if type(signals) is list:
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self.known_signals.extend(signals)
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else:
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self.known_signals.append(signals)
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urwid.register_signal(Signal, self.known_signals)
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def emit_signal(self, name, *args, **kwargs):
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urwid.emit_signal(self, name, *args, **kwargs)
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def connect_signal(self, name, cb):
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if isinstance(cb, types.MethodType):
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scb = "{}.{}".format(
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cb.__self__.__class__.__name__, cb.__func__.__name__)
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else:
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scb = str(cb)
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log.debug("connect_signal: %s -> %s", name, scb)
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urwid.connect_signal(self, name, cb)
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def connect_signals(self, signal_callback):
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""" Connects a batch of signals
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:param list signal_callback: List of tuples eg. ('signame', self.cb)
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"""
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if not type(signal_callback) is list:
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raise SignalException(
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"Passed something other than a required list.")
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for sig, cb in signal_callback:
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if sig not in self.known_signals:
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self.register_signals(sig)
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self.connect_signal(sig, cb)
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