154 lines
5.4 KiB
Python
154 lines
5.4 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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from concurrent import futures
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import logging
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import urwid
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from subiquitycore.signals import Signal
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from subiquitycore.palette import STYLES, STYLES_MONO
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from subiquitycore.prober import Prober, ProberException
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log = logging.getLogger('subiquitycore.core')
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class ApplicationError(Exception):
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""" Basecontroller exception """
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pass
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class Application:
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# A concrete subclass must set project and controllers attributes, e.g.:
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#
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# project = "subiquity"
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# controllers = [
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# "Welcome",
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# "Installpath",
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# "Network",
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# "Filesystem",
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# "Identity",
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# "InstallProgress",
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# "Login",
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# ]
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# The 'next-screen' and 'prev-screen' signals move through the list of
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# controllers in order, calling the default method on the controller
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# instance.
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def __init__(self, ui, opts):
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try:
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prober = Prober(opts)
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except ProberException as e:
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err = "Prober init failed: {}".format(e)
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log.exception(err)
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raise ApplicationError(err)
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self.common = {
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"ui": ui,
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"opts": opts,
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"signal": Signal(),
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"prober": prober,
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"loop": None,
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"pool": futures.ThreadPoolExecutor(1),
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}
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self.common['controllers'] = dict.fromkeys(self.controllers)
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self.controller_index = -1
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def _connect_base_signals(self):
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""" Connect signals used in the core controller
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"""
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signals = []
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signals.append(('quit', self.exit))
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if self.common['opts'].dry_run:
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signals.append(('control-x-quit', self.exit))
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signals.append(('refresh', self.redraw_screen))
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signals.append(('next-screen', self.next_screen))
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signals.append(('prev-screen', self.prev_screen))
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self.common['signal'].connect_signals(signals)
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# Registers signals from each controller
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for controller, controller_class in self.common['controllers'].items():
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controller_class.register_signals()
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log.debug(self.common['signal'])
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def next_screen(self, *args):
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self.controller_index += 1
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if self.controller_index >= len(self.controllers):
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self.exit()
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controller_name = self.controllers[self.controller_index]
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log.debug("moving to screen %s", controller_name)
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next_controller = self.common['controllers'][controller_name]
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next_controller.default()
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def prev_screen(self, *args):
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if self.controller_index == 0:
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return
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self.controller_index -= 1
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if self.controller_index >= len(self.controllers):
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self.exit()
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controller_name = self.controllers[self.controller_index]
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next_controller = self.common['controllers'][controller_name]
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next_controller.default()
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# EventLoop -------------------------------------------------------------------
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def redraw_screen(self):
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if self.common['loop'] is not None:
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try:
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self.common['loop'].draw_screen()
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except AssertionError as e:
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log.critical("Redraw screen error: {}".format(e))
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def exit(self):
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raise urwid.ExitMainLoop()
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def header_hotkeys(self, key):
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return False
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def run(self):
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if not hasattr(self, 'loop'):
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palette = STYLES
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additional_opts = {
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'screen': urwid.raw_display.Screen(),
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'unhandled_input': self.header_hotkeys,
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'handle_mouse': False,
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'pop_ups': True,
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}
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if self.common['opts'].run_on_serial:
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palette = STYLES_MONO
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else:
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additional_opts['screen'].set_terminal_properties(colors=256)
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additional_opts['screen'].reset_default_terminal_palette()
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self.common['loop'] = urwid.MainLoop(
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self.common['ui'], palette, **additional_opts)
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log.debug("Running event loop: {}".format(
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self.common['loop'].event_loop))
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try:
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self.common['loop'].set_alarm_in(0.05, self.next_screen)
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controllers_mod = __import__('%s.controllers' % self.project, None, None, [''])
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for k in self.common['controllers']:
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log.debug("Importing controller: {}".format(k))
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klass = getattr(controllers_mod, k+"Controller")
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self.common['controllers'][k] = klass(self.common)
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log.debug("*** %s", self.common['controllers'])
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self._connect_base_signals()
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self.common['loop'].run()
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except:
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log.exception("Exception in controller.run():")
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raise
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