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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pysnmp/license.html
#
# Copyright (C) 2008 Truelite Srl <info@truelite.it>
# Author: Filippo Giunchedi <filippo@truelite.it>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the BSD 2-Clause License as shipped with pysnmp.
#
# Description: Transport dispatcher based on twisted.internet.reactor
#
import sys
import time
import traceback
from twisted.internet import reactor
from twisted.internet import task
from pysnmp.carrier.base import AbstractTransportDispatcher
from pysnmp.error import PySnmpError
class TwistedDispatcher(AbstractTransportDispatcher):
"""TransportDispatcher based on twisted.internet.reactor"""
def __init__(self, *args, **kwargs):
AbstractTransportDispatcher.__init__(self)
self.__transportCount = 0
if 'timeout' in kwargs:
self.setTimerResolution(kwargs['timeout'])
self.loopingcall = task.LoopingCall(
lambda self=self: self.handleTimerTick(time.time())
)
def runDispatcher(self, timeout=0.0):
if not reactor.running:
try:
reactor.run()
except KeyboardInterrupt:
raise
except Exception:
raise PySnmpError('reactor error: %s' % ';'.join(traceback.format_exception(*sys.exc_info())))
# jobstarted/jobfinished might be okay as-is
def registerTransport(self, tDomain, transport):
if not self.loopingcall.running and self.getTimerResolution() > 0:
self.loopingcall.start(self.getTimerResolution(), now=False)
AbstractTransportDispatcher.registerTransport(
self, tDomain, transport
)
self.__transportCount += 1
def unregisterTransport(self, tDomain):
t = AbstractTransportDispatcher.getTransport(self, tDomain)
if t is not None:
AbstractTransportDispatcher.unregisterTransport(self, tDomain)
self.__transportCount -= 1
# The last transport has been removed, stop the timeout
if self.__transportCount == 0 and self.loopingcall.running:
self.loopingcall.stop()
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