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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 Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
""" Registers all known signal emitters
"""
import urwid
import logging
log = logging.getLogger('subiquity.signals')
class SignalException(Exception):
"Problem with a signal"
class Signal:
known_signals = []
signal_stack = []
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, signals)
def prev_signal(self):
log.debug('prev_signal: before: '
'size={} stack={}'.format(len(self.signal_stack),
self.signal_stack))
if len(self.signal_stack) > 1:
(current_name, *_) = self.signal_stack.pop()
(prev_name, args, kwargs) = self.signal_stack.pop()
log.debug('current_name={}'.format(current_name))
log.debug('previous={}'.format(prev_name))
while (current_name.count(':') < prev_name.count(':') or
current_name == prev_name):
log.debug('get next previous')
(prev_name, args, kwargs) = self.signal_stack.pop()
log.debug('previous={}'.format(prev_name))
log.debug('prev_signal: after: '
'size={} stack={}'.format(len(self.signal_stack),
self.signal_stack))
log.debug("PrevEmitter: {}, {}, {}".format(prev_name, args,
kwargs))
self.emit_signal(prev_name, *args, **kwargs)
else:
log.debug('stack empty: emitting menu:welcome:main')
# FIXME: this should be set by common
urwid.emit_signal(self, 'menu:welcome:main')
def emit_signal(self, name, *args, **kwargs):
# Disabled because it can reveal credentials in the arguments.
#log.debug("Emitter: {}, {}, {}".format(name, args, kwargs))
if name.startswith("menu:"):
log.debug(" emit: before: "
"size={} stack={}".format(len(self.signal_stack),
self.signal_stack))
# only stack *menu* signals, drop signals if we've already
# visited this level
match = [s for s in self.signal_stack if s[0] == name]
if len(match) > 0:
index = self.signal_stack.index(match.pop())
log.debug('Already visited {}, trimming stack'.format(name))
self.signal_stack = self.signal_stack[0:index + 1]
else:
log.debug('New menu for stack: {}'.format(name))
self.signal_stack.append((name, args, kwargs))
log.debug(" emit: after: "
"size={} stack={}".format(len(self.signal_stack),
self.signal_stack))
urwid.emit_signal(self, name, *args, **kwargs)
def connect_signal(self, name, cb, **kwargs):
log.debug(
"Emitter Connection: {}, {}, {}".format(name,
cb,
kwargs))
urwid.connect_signal(self, name, cb, **kwargs)
def connect_signals(self, signal_callback):
""" Connects a batch of signals
:param list signal_callback: List of tuples
eg. ('menu:welcome:show', 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)
def __repr__(self):
return "Known Signals: {}".format(self.known_signals)
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