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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/>.
from abc import ABC, abstractmethod
import logging
import os
log = logging.getLogger("subiquitycore.controller")
def view(func):
n = func.__name__
def f(self, *args, **kw):
m = getattr(self, n)
self.view_stack.append((m, args, kw))
return func(self, *args, **kw)
return f
class BaseController(ABC):
"""Base class for controllers."""
signals = []
def __init__(self, common):
self.ui = common['ui']
self.signal = common['signal']
self.opts = common['opts']
self.loop = common['loop']
self.prober = common['prober']
self.controllers = common['controllers']
self.pool = common['pool']
self.view_stack = []
def register_signals(self):
"""Defines signals associated with controller from model."""
signals = []
for sig, cb in self.signals:
signals.append((sig, getattr(self, cb)))
self.signal.connect_signals(signals)
def prev_view(self):
self.view_stack.pop()
meth, args, kw = self.view_stack.pop()
meth(*args, **kw)
def run_in_bg(self, func, callback):
"""Run func() in a thread and call callback on UI thread.
callback will be passed a concurrent.futures.Future containing
the result of func(). The result of callback is discarded. Any
exception will be logged.
"""
fut = self.pool.submit(func)
def in_main_thread(ignored):
try:
callback(fut)
except:
log.exception("callback %s after calling %s failed", callback, func)
pipe = self.loop.watch_pipe(in_main_thread)
def in_random_thread(ignored):
os.write(pipe, b'x')
fut.add_done_callback(in_random_thread)
@abstractmethod
def cancel(self):
pass
@abstractmethod
def default(self):
pass
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