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from itertools import chain, repeat
from twisted.logger import Logger
logger = Logger()
# TODO implement a state machine in this class
class VPNStatus(object):
"""
A class containing different patterns in the openvpn output that
we can react upon.
"""
_events = {
'NETWORK_UNREACHABLE': (
'Network is unreachable (code=101)',),
'PROCESS_RESTART_TLS': (
"SIGTERM[soft,tls-error]",),
'PROCESS_RESTART_PING': (
"SIGTERM[soft,ping-restart]",),
'INITIALIZATION_COMPLETED': (
"Initialization Sequence Completed",),
}
def __init__(self):
self.status = 'OFFLINE'
self._traffic_down = None
self._traffic_up = None
def watch(self, line):
"""
Inspects line searching for the different patterns. If a match
is found, try to emit the corresponding signal.
:param line: a line of openvpn output
:type line: str
"""
chained_iter = chain(*[
zip(repeat(key, len(l)), l)
for key, l in self._events.iteritems()])
for event, pattern in chained_iter:
if pattern in line:
break
else:
return
status, errcode = self._status_codes(event)
self.set_status(status, errcode)
def set_status(self, status, errcode):
self.status = status
self.errcode = errcode
def set_traffic_status(self, status):
down, up = status
self._traffic_up = up
self._traffic_down = down
def get_traffic_status(self):
# XXX return Human readable too
return {'down': self._traffic_down,
'up': self._traffic_up}
def _status_codes(self, event):
# TODO check good transitions
# TODO check valid states
_table = {
"network_unreachable": ('OFFLINE', 'network unreachable'),
"process_restart_tls": ('RESTARTING', 'restart tls'),
"process_restart_ping": ('CONNECTING', None),
"initialization_completed": ('ONLINE', None)
}
return _table.get(event.lower())
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