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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 sys import version_info
from pysnmp.hlapi.asyncore import ntforg
__all__ = ['sendNotification']
if version_info[:2] < (2, 6):
__all__.append('next')
# noinspection PyShadowingBuiltins
def next(iter):
return iter.next()
def sendNotification(snmpEngine, authData, transportTarget, contextData,
notifyType, varBinds, **options):
"""Creates a generator to send one or more SNMP notifications.
On each iteration, new SNMP TRAP or INFORM notification is send
(:RFC:`1905#section-4,2,6`). The iterator blocks waiting for
INFORM acknowlegement to arrive or error to occur.
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.asyncore.UdpTransportTarget` or :py:class:`~pysnmp.hlapi.asyncore.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
--------
>>> from pysnmp.hlapi import *
>>> g = sendNotification(SnmpEngine(),
... CommunityData('public'),
... UdpTransportTarget(('demo.snmplabs.com', 162)),
... ContextData(),
... 'trap',
... NotificationType(ObjectIdentity('IF-MIB', 'linkDown')))
>>> next(g)
(None, 0, 0, [])
>>>
"""
# noinspection PyShadowingNames
def cbFun(snmpEngine, sendRequestHandle,
errorIndication, errorStatus, errorIndex,
varBinds, cbCtx):
cbCtx['errorIndication'] = errorIndication
cbCtx['errorStatus'] = errorStatus
cbCtx['errorIndex'] = errorIndex
cbCtx['varBinds'] = varBinds
cbCtx = {}
while True:
if varBinds:
ntforg.sendNotification(snmpEngine, authData, transportTarget,
contextData, notifyType, varBinds,
cbFun, cbCtx,
lookupMib=options.get('lookupMib', True))
snmpEngine.transportDispatcher.runDispatcher()
errorIndication = cbCtx.get('errorIndication')
errorStatus = cbCtx.get('errorStatus')
errorIndex = cbCtx.get('errorIndex')
varBinds = cbCtx.get('varBinds', [])
else:
errorIndication = errorStatus = errorIndex = None
varBinds = []
varBinds = (yield errorIndication, errorStatus, errorIndex, varBinds)
if not varBinds:
break
|
