124 lines
5.0 KiB
Python
124 lines
5.0 KiB
Python
#
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# This file is part of pysnmp software.
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#
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# Copyright (c) 2005-2017, Ilya Etingof <etingof@gmail.com>
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# License: http://pysnmp.sf.net/license.html
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#
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# Copyright (C) 2014, Zebra Technologies
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# Authors: Matt Hooks <me@matthooks.com>
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# Zachary Lorusso <zlorusso@gmail.com>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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# THE POSSIBILITY OF SUCH DAMAGE.
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#
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import sys
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import traceback
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from pysnmp.carrier.asyncio.base import AbstractAsyncioTransport
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from pysnmp.carrier import error
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from pysnmp import debug
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try:
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import asyncio
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except ImportError:
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import trollius as asyncio
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loop = asyncio.get_event_loop()
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class DgramAsyncioProtocol(asyncio.DatagramProtocol, AbstractAsyncioTransport):
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"""Base Asyncio datagram Transport, to be used with AsyncioDispatcher"""
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sockFamily = None
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addressType = lambda x: x
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transport = None
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def __init__(self, sock=None, sockMap=None):
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self._writeQ = []
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self._lport = None
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def datagram_received(self, datagram, transportAddress):
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if self._cbFun is None:
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raise error.CarrierError('Unable to call cbFun')
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else:
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loop.call_soon(self._cbFun, self, transportAddress, datagram)
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def connection_made(self, transport):
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self.transport = transport
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debug.logger & debug.flagIO and debug.logger('connection_made: invoked')
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while self._writeQ:
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outgoingMessage, transportAddress = self._writeQ.pop(0)
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debug.logger & debug.flagIO and debug.logger('connection_made: transportAddress %r outgoingMessage %s' %
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(transportAddress, debug.hexdump(outgoingMessage)))
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try:
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self.transport.sendto(outgoingMessage, self.normalizeAddress(transportAddress))
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except Exception:
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raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
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def connection_lost(self, exc):
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debug.logger & debug.flagIO and debug.logger('connection_lost: invoked')
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# AbstractAsyncioTransport API
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def openClientMode(self, iface=None):
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try:
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c = loop.create_datagram_endpoint(
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lambda: self, local_addr=iface, family=self.sockFamily
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)
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self._lport = asyncio.async(c)
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except Exception:
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raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
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return self
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def openServerMode(self, iface):
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try:
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c = loop.create_datagram_endpoint(
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lambda: self, local_addr=iface, family=self.sockFamily
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)
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self._lport = asyncio.async(c)
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except Exception:
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raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
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return self
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def closeTransport(self):
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if self._lport is not None:
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self._lport.cancel()
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if self.transport is not None:
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self.transport.close()
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AbstractAsyncioTransport.closeTransport(self)
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def sendMessage(self, outgoingMessage, transportAddress):
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debug.logger & debug.flagIO and debug.logger('sendMessage: %s transportAddress %r outgoingMessage %s' % (
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(self.transport is None and "queuing" or "sending"),
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transportAddress, debug.hexdump(outgoingMessage)
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))
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if self.transport is None:
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self._writeQ.append((outgoingMessage, transportAddress))
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else:
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try:
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self.transport.sendto(outgoingMessage, self.normalizeAddress(transportAddress))
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except Exception:
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raise error.CarrierError(';'.join(traceback.format_exception(*sys.exc_info())))
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def normalizeAddress(self, transportAddress):
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if not isinstance(transportAddress, self.addressType):
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transportAddress = self.addressType(transportAddress)
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return transportAddress
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