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# -*- coding: utf-8 -*-
# backend_app.py
# Copyright (C) 2013, 2014 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Start point for the Backend.
"""
import multiprocessing
import signal
from twisted.internet import reactor
from leap.common.events import server as event_server
from leap.bitmask.backend.leapbackend import LeapBackend
from leap.bitmask.backend.utils import generate_zmq_certificates
from leap.bitmask.config import flags
from leap.bitmask.logs.utils import get_logger
from leap.bitmask.util import dict_to_flags
def signal_handler(signum, frame):
"""
Signal handler that quits the running app cleanly.
:param signum: number of the signal received (e.g. SIGINT -> 2)
:type signum: int
:param frame: current stack frame
:type frame: frame or None
"""
# Note: we don't stop the backend in here since the frontend signal handler
# will take care of that.
# In the future we may need to do the stop in here when the frontend and
# the backend are run separately (without multiprocessing)
pname = multiprocessing.current_process().name
print "{0}: SIGNAL #{1} catched.".format(pname, signum)
def run_backend(bypass_checks=False, flags_dict=None, frontend_pid=None):
"""
Run the backend for the application.
This is called from the main app.py entrypoint, and is run in a child
subprocess.
:param bypass_checks: whether we should bypass the checks or not
:type bypass_checks: bool
:param flags_dict: a dict containing the flag values set on app start.
:type flags_dict: dict
"""
# In the backend, we want all the components to log into logbook
# that is: logging handlers and twisted logs
from logbook.compat import redirect_logging
from twisted.python.log import PythonLoggingObserver
redirect_logging()
observer = PythonLoggingObserver()
observer.start()
# NOTE: this needs to be used here, within the call since this function is
# executed in a different process and it seems that the process/thread
# identification isn't working 100%
logger = get_logger() # noqa
if flags_dict is not None:
dict_to_flags(flags_dict)
# The backend is the one who always creates the certificates. Either if it
# is run separately or in a process in the same app as the frontend.
if flags.ZMQ_HAS_CURVE:
generate_zmq_certificates()
# ignore SIGINT since app.py takes care of signaling SIGTERM to us.
signal.signal(signal.SIGINT, signal.SIG_IGN)
signal.signal(signal.SIGTERM, signal_handler)
reactor.callWhenRunning(start_events_and_updater, logger)
backend = LeapBackend(bypass_checks=bypass_checks,
frontend_pid=frontend_pid)
backend.run()
def start_events_and_updater(logger):
event_server.ensure_server()
if flags.STANDALONE:
try:
from leap.bitmask.updater import Updater
updater = Updater()
updater.start()
except ImportError:
logger.error("Updates are not enabled in this distribution.")
if __name__ == '__main__':
run_backend()
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