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#
# Copyright (C) 2014, Zebra Technologies
# Authors: Matt Hooks <me@matthooks.com>
# Zachary Lorusso <zlorusso@gmail.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
#
import sys
import traceback
from pysnmp.carrier.asyncio.base import AbstractAsyncioTransport
from pysnmp.carrier import error
from pysnmp import debug
try:
import asyncio
except ImportError:
import trollius as asyncio
loop = asyncio.get_event_loop()
class DgramAsyncioProtocol(asyncio.DatagramProtocol, AbstractAsyncioTransport):
"""Base Asyncio datagram Transport, to be used with AsyncioDispatcher"""
sockFamily = None
addressType = lambda x: x
transport = None
def __init__(self, *args, **kwargs):
self._writeQ = []
def datagram_received(self, datagram, transportAddress):
if self._cbFun is None:
raise error.CarrierError('Unable to call cbFun')
else:
loop.call_soon(self._cbFun, self, transportAddress, datagram)
def connection_made(self, transport):
self.transport = transport
debug.logger & debug.flagIO and debug.logger('connection_made: invoked')
while self._writeQ:
outgoingMessage, transportAddress = self._writeQ.pop(0)
debug.logger & debug.flagIO and debug.logger('connection_made: transportAddress %r outgoingMessage %s' %
(transportAddress, debug.hexdump(outgoingMessage)))
try:
self.transport.sendto(outgoingMessage, self.normalizeAddress(transportAddress))
except Exception:
raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
def connection_lost(self, exc):
debug.logger & debug.flagIO and debug.logger('connection_lost: invoked')
# AbstractAsyncioTransport API
def openClientMode(self, iface=None):
try:
c = loop.create_datagram_endpoint(
lambda: self, local_addr=iface, family=self.sockFamily
)
self._lport = asyncio.async(c)
except Exception:
raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
return self
def openServerMode(self, iface):
try:
c = loop.create_datagram_endpoint(
lambda: self, local_addr=iface, family=self.sockFamily
)
self._lport = asyncio.async(c)
except Exception:
raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
return self
def closeTransport(self):
self._lport.cancel()
if self.transport is not None:
self.transport.close()
AbstractAsyncioTransport.closeTransport(self)
def sendMessage(self, outgoingMessage, transportAddress):
debug.logger & debug.flagIO and debug.logger('sendMessage: %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.sendto(outgoingMessage, self.normalizeAddress(transportAddress))
except Exception:
raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
def normalizeAddress(self, transportAddress):
if not isinstance(transportAddress, self.addressType):
transportAddress = self.addressType(transportAddress)
return transportAddress
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