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# -*- coding: utf-8 -*-
from __future__ import (print_function)
import logging
import threading
from leap.base.checks import LeapNetworkChecker
from leap.base.constants import ROUTE_CHECK_INTERVAL
from leap.base.exceptions import TunnelNotDefaultRouteError
from leap.util.coroutines import (launch_thread, process_events)
from time import sleep
logger = logging.getLogger(name=__name__)
class NetworkChecker(object):
"""
Manages network checking thread that makes sure we have a working network
connection.
"""
def __init__(self, *args, **kwargs):
self.status_signals = kwargs.pop('status_signals', None)
self.watcher_cb = kwargs.pop('status_signals', None)
self.error_cb = kwargs.pop(
'error_cb',
lambda exc: logger.error("%s", exc.message))
self.shutdown = threading.Event()
self.checker = LeapNetworkChecker()
def start(self):
self.process_handle = self._launch_recurrent_network_checks(
(self.error_cb,))
def stop(self):
self.shutdown.set()
logger.debug("network checked stopped.")
def run_checks(self):
pass
#private methods
#here all the observers in fail_callbacks expect one positional argument,
#which is exception so we can try by passing a lambda with logger to
#check it works.
def _network_checks_thread(self, fail_callbacks):
#TODO: replace this with waiting for a signal from openvpn
while True:
try:
self.checker.check_tunnel_default_interface()
break
except TunnelNotDefaultRouteError:
sleep(1)
observer_dict = dict(((
observer,
process_events(observer)) for observer in fail_callbacks))
while not self.shutdown.is_set():
try:
self.checker.check_tunnel_default_interface()
self.checker.check_internet_connection()
sleep(ROUTE_CHECK_INTERVAL)
except Exception as exc:
for obs in observer_dict:
observer_dict[obs].send(exc)
sleep(ROUTE_CHECK_INTERVAL)
#reset event
self.shutdown.clear()
def _launch_recurrent_network_checks(self, fail_callbacks):
#we need to wrap the fail callback in a tuple
watcher = launch_thread(
self._network_checks_thread,
(fail_callbacks,))
return watcher
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