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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2016, Ilya Etingof <ilya@glas.net>
# License: http://pysnmp.sf.net/license.html
#
# Copyright (C) 2014, Zebra Technologies
# Authors: Matt Hooks <me@matthooks.com>
# Zachary Lorusso <zlorusso@gmail.com>
#
from pysnmp.smi.rfc1902 import *
from pysnmp.hlapi.auth import *
from pysnmp.hlapi.context import *
from pysnmp.hlapi.lcd import *
from pysnmp.hlapi.varbinds import *
from pysnmp.hlapi.asyncio.transport import *
from pysnmp.entity.rfc3413 import ntforg
try:
import asyncio
except ImportError:
import trollius as asyncio
__all__ = ['sendNotification']
vbProcessor = NotificationOriginatorVarBinds()
lcd = NotificationOriginatorLcdConfigurator()
@asyncio.coroutine
def sendNotification(snmpEngine, authData, transportTarget, contextData,
notifyType, varBinds, **options):
"""Creates a generator to send SNMP notification.
When itereator gets advanced by :py:mod:`asyncio` main loop,
SNMP TRAP or INFORM notification is send (:RFC:`1905#section-4.2.6`).
The iterator yields :py:class:`asyncio.Future` which gets done whenever
response arrives or error occurs.
Parameters
----------
snmpEngine : :py:class:`~pysnmp.hlapi.SnmpEngine`
Class instance representing SNMP engine.
authData : :py:class:`~pysnmp.hlapi.CommunityData` or :py:class:`~pysnmp.hlapi.UsmUserData`
Class instance representing SNMP credentials.
transportTarget : :py:class:`~pysnmp.hlapi.asyncio.UdpTransportTarget` or :py:class:`~pysnmp.hlapi.asyncio.Udp6TransportTarget`
Class instance representing transport type along with SNMP peer address.
contextData : :py:class:`~pysnmp.hlapi.ContextData`
Class instance representing SNMP ContextEngineId and ContextName values.
notifyType : str
Indicates type of notification to be sent. Recognized literal
values are *trap* or *inform*.
varBinds: tuple
Single :py:class:`~pysnmp.smi.rfc1902.NotificationType` class instance
representing a minimum sequence of MIB variables required for
particular notification type.
Alternatively, a sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType`
objects could be passed instead. In the latter case it is up to
the user to ensure proper Notification PDU contents.
Other Parameters
----------------
\*\*options :
Request options:
* `lookupMib` - load MIB and resolve response MIB variables at
the cost of slightly reduced performance. Default is `True`.
Yields
------
errorIndication : str
True value indicates SNMP engine error.
errorStatus : str
True value indicates SNMP PDU error.
errorIndex : int
Non-zero value refers to `varBinds[errorIndex-1]`
varBinds : tuple
A sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType` class
instances representing MIB variables returned in SNMP response.
Raises
------
PySnmpError
Or its derivative indicating that an error occurred while
performing SNMP operation.
Notes
-----
The `sendNotification` generator will be exhausted immidiately unless
an instance of :py:class:`~pysnmp.smi.rfc1902.NotificationType` class
or a sequence of :py:class:`~pysnmp.smi.rfc1902.ObjectType` `varBinds`
are send back into running generator (supported since Python 2.6).
Examples
--------
>>> import asyncio
>>> from pysnmp.hlapi.asyncio import *
>>>
>>> @asyncio.coroutine
... def run():
... errorIndication, errorStatus, errorIndex, varBinds = yield from sendNotification(
... SnmpEngine(),
... CommunityData('public'),
... UdpTransportTarget(('demo.snmplabs.com', 162)),
... ContextData(),
... 'trap',
... NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
... print(errorIndication, errorStatus, errorIndex, varBinds)
...
>>> asyncio.get_event_loop().run_until_complete(run())
(None, 0, 0, [])
>>>
"""
def __cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBinds, cbCtx):
lookupMib, future = cbCtx
if future.cancelled():
return
future.set_result(
(errorIndication, errorStatus, errorIndex, vbProcessor.unmakeVarBinds(snmpEngine, varBinds, lookupMib))
)
notifyName = lcd.configure(
snmpEngine, authData, transportTarget, notifyType
)
future = asyncio.Future()
ntforg.NotificationOriginator().sendVarBinds(
snmpEngine,
notifyName,
contextData.contextEngineId,
contextData.contextName,
vbProcessor.makeVarBinds(snmpEngine, varBinds),
__cbFun,
(options.get('lookupMib', True), future)
)
if notifyType == 'trap':
def __trapFun(future):
if future.cancelled():
return
future.set_result((None, 0, 0, []))
loop = asyncio.get_event_loop()
loop.call_soon(__trapFun, future)
return future
|
