114 lines
4.5 KiB
Python
114 lines
4.5 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 urwid
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import logging
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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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signal_stack = []
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default_signal = None
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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, signals)
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def prev_signal(self):
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log.debug('prev_signal: before: '
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'size={} stack={}'.format(len(self.signal_stack),
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self.signal_stack))
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if len(self.signal_stack) > 1:
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(current_name, *_) = self.signal_stack.pop()
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(prev_name, args, kwargs) = self.signal_stack.pop()
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log.debug('current_name={}'.format(current_name))
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log.debug('previous={}'.format(prev_name))
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while (current_name.count(':') < prev_name.count(':') or
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current_name == prev_name):
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log.debug('get next previous')
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(prev_name, args, kwargs) = self.signal_stack.pop()
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log.debug('previous={}'.format(prev_name))
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log.debug('prev_signal: after: '
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'size={} stack={}'.format(len(self.signal_stack),
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self.signal_stack))
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log.debug("PrevEmitter: {}, {}, {}".format(prev_name, args,
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kwargs))
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self.emit_signal(prev_name, *args, **kwargs)
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else:
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log.debug('stack empty: emitting menu:welcome:main')
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# FIXME: this should be set by common
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urwid.emit_signal(self, 'menu:welcome:main')
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def emit_signal(self, name, *args, **kwargs):
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# Disabled because it can reveal credentials in the arguments.
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#log.debug("Emitter: {}, {}, {}".format(name, args, kwargs))
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if name.startswith("menu:"):
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log.debug(" emit: before: "
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"size={} stack={}".format(len(self.signal_stack),
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self.signal_stack))
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# only stack *menu* signals, drop signals if we've already
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# visited this level
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match = [s for s in self.signal_stack if s[0] == name]
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if len(match) > 0:
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index = self.signal_stack.index(match.pop())
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log.debug('Already visited {}, trimming stack'.format(name))
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self.signal_stack = self.signal_stack[0:index + 1]
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else:
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log.debug('New menu for stack: {}'.format(name))
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self.signal_stack.append((name, args, kwargs))
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log.debug(" emit: after: "
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"size={} stack={}".format(len(self.signal_stack),
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self.signal_stack))
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urwid.emit_signal(self, name, *args, **kwargs)
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def connect_signal(self, name, cb, **kwargs):
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log.debug(
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"Emitter Connection: {}, {}, {}".format(name,
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cb,
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kwargs))
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urwid.connect_signal(self, name, cb, **kwargs)
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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
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eg. ('menu:welcome:show', 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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def __repr__(self):
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return "Known Signals: {}".format(self.known_signals)
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