summaryrefslogtreecommitdiff
path: root/src/leap/base/network.py
blob: e90139c40498958dea60d3bb8596bded68995614 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
# -*- 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 NetworkCheckerThread(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()

        # XXX get provider_gateway and pass it to checker
        # see in eip.config for function
        # #718
        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:
                # XXX ??? why do we sleep here???
                sleep(1)

        fail_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 fail_observer_dict:
                    fail_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