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from itertools import chain, repeat
from leap.common.events import catalog, emit_async
from leap.bitmask.vpn._human import bytes2human
# TODO implement a more explicit state machine
# TODO check good transitions
# TODO check valid states
class VPNStatus(object):
"""
A class containing different patterns in the openvpn output that
we can react upon. The patterns drive an internal state machine that can be
queried through the ``status`` property.
"""
_events = {
'NETWORK_UNREACHABLE': (
'Network is unreachable (code=101)',),
'PROCESS_RESTART_TLS': (
"SIGTERM[soft,tls-error]",),
'INITIALIZATION_COMPLETED': (
"Initialization Sequence Completed",),
}
_STARTING = ('AUTH', 'WAIT', 'CONNECTING', 'GET_CONFIG',
'ASSIGN_IP', 'ADD_ROUTES', 'RECONNECTING')
_STOPPING = ("EXITING",)
_CONNECTED = ("CONNECTED",)
def __init__(self):
self._status = 'off'
self.errcode = None
self._traffic_down = None
self._traffic_up = None
self._chained_iter = chain(*[
zip(repeat(key, len(l)), l)
for key, l in self._events.iteritems()])
def _status_codes(self, event):
_table = {
"network_unreachable": ('off', 'network unreachable'),
"process_restart_tls": ('starting', 'restart tls'),
"initialization_completed": ('on', None)
}
return _table.get(event.lower())
def watch(self, line):
for event, pattern in self._chained_iter:
if pattern in line:
break
else:
return
status, errcode = self._status_codes(event)
self.set_status(status, errcode)
@property
def status(self):
status = self.get_traffic_status()
status.update({
'status': self._status,
'error': self.errcode
})
return status
def set_status(self, status, errcode):
if status in self._STARTING:
status = "starting"
elif status in self._STOPPING:
status = "stopping"
elif status in self._CONNECTED:
status = "on"
self._status = status
self.errcode = errcode
emit_async(catalog.VPN_STATUS_CHANGED)
def get_traffic_status(self):
down = None
up = None
if self._traffic_down:
down = bytes2human(self._traffic_down)
if self._traffic_up:
up = bytes2human(self._traffic_up)
return {'down': down, 'up': up}
def set_traffic_status(self, status):
up, down = status
self._traffic_up = up
self._traffic_down = down
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