Fixed repetitive freezing of IDE when connection drops.
when connection lost error was beeing displayed, the involved wxYield
was calling pending plc status periodic update, itself trying to use connector.
At that time connector is still not destroyed and connection
is attempted again when calling GetPLCStatus.
=> Hack : Ensure connector is destroyed before reporting error.
from __future__ import absolute_import
from __future__ import print_function
import os
from binascii import b2a_hqx
try:
from runtime.spawn_subprocess import call
except ImportError:
from subprocess import call
restart_stunnel_cmdline = ["/etc/init.d/S50stunnel", "restart"]
_PSKpath = None
def restartStunnel():
"""
Restart stunnel service using SysV init stript
to apply new generated credentials
"""
try:
call(restart_stunnel_cmdline)
except OSError:
print(_("Couldn't restart stunnel service"))
def PSKgen(ID, PSKpath):
# b2a_hqx output len is 4/3 input len
secret = os.urandom(192) # int(256/1.3333)
secretstring = b2a_hqx(secret)
PSKstring = ID+":"+secretstring
with open(PSKpath, 'w') as f:
f.write(PSKstring)
restartStunnel()
def ensurePSK(ID, PSKpath):
global _PSKpath
_PSKpath = PSKpath
# check if already there
if not os.path.exists(PSKpath):
# create if needed
PSKgen(ID, PSKpath)
def getPSKID(errorlog):
if _PSKpath is not None:
if not os.path.exists(_PSKpath):
errorlog(
'Error: Pre-Shared-Key Secret in %s is missing!\n' % _PSKpath)
return None
ID, _sep, PSK = open(_PSKpath).read().partition(':')
PSK = PSK.rstrip('\n\r')
return (ID, PSK)
return None