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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
#
from twisted.internet import reactor
from twisted.internet.protocol import DatagramProtocol
from pysnmp import debug
from pysnmp.carrier import error
from pysnmp.carrier.twisted.base import AbstractTwistedTransport
class DgramTwistedTransport(DatagramProtocol, AbstractTwistedTransport):
"""Base Twisted datagram Transport, to be used with TwistedDispatcher"""
# Twisted Datagram API
def datagramReceived(self, datagram, transportAddress):
if self._cbFun is None:
raise error.CarrierError('Unable to call cbFun')
else:
# Callback fun is called through callLater() in attempt
# to make Twisted timed calls work under high load.
reactor.callLater(0, self._cbFun, self, transportAddress, datagram)
def startProtocol(self):
debug.logger & debug.FLAG_IO and debug.logger('startProtocol: invoked')
while self._writeQ:
outgoingMessage, transportAddress = self._writeQ.pop(0)
debug.logger & debug.FLAG_IO and debug.logger('startProtocol: transportAddress %r outgoingMessage %s' % (transportAddress, debug.hexdump(outgoingMessage)))
try:
self.transport.write(outgoingMessage, transportAddress)
except Exception as exc:
raise error.CarrierError('Twisted exception: %s' % exc)
def stopProtocol(self):
debug.logger & debug.FLAG_IO and debug.logger('stopProtocol: invoked')
def sendMessage(self, outgoingMessage, transportAddress):
debug.logger & debug.FLAG_IO and debug.logger('startProtocol: %s transportAddress %r outgoingMessage %s' % ((self.transport is None and "queuing" or "sending"), transportAddress, debug.hexdump(outgoingMessage)))
if self.transport is None:
self._writeQ.append((outgoingMessage, transportAddress))
else:
try:
self.transport.write(outgoingMessage, transportAddress)
except Exception as exc:
raise error.CarrierError('Twisted exception: %s' % exc)
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