67 lines
2.5 KiB
Python
67 lines
2.5 KiB
Python
#
|
|
# This file is part of pysnmp software.
|
|
#
|
|
# Copyright (c) 2005-2018, Ilya Etingof <etingof@gmail.com>
|
|
# License: http://snmplabs.com/pysnmp/license.html
|
|
#
|
|
from pysnmp import error
|
|
|
|
|
|
class MetaObserver(object):
|
|
"""This is a simple facility for exposing internal SNMP Engine
|
|
working details to pysnmp applications. These details are
|
|
basically local scope variables at a fixed point of execution.
|
|
|
|
Two modes of operations are offered:
|
|
1. Consumer: app can request an execution point context by execution point ID.
|
|
2. Provider: app can register its callback function (and context) to be invoked
|
|
once execution reaches specified point. All local scope variables
|
|
will be passed to the callback as in #1.
|
|
|
|
It's important to realize that execution context is only guaranteed
|
|
to exist to functions that are at the same or deeper level of invocation
|
|
relative to execution point specified.
|
|
"""
|
|
|
|
def __init__(self):
|
|
self.__observers = {}
|
|
self.__contexts = {}
|
|
self.__execpoints = {}
|
|
|
|
def registerObserver(self, cbFun, *execpoints, **kwargs):
|
|
if cbFun in self.__contexts:
|
|
raise error.PySnmpError('duplicate observer %s' % cbFun)
|
|
else:
|
|
self.__contexts[cbFun] = kwargs.get('cbCtx')
|
|
for execpoint in execpoints:
|
|
if execpoint not in self.__observers:
|
|
self.__observers[execpoint] = []
|
|
self.__observers[execpoint].append(cbFun)
|
|
|
|
def unregisterObserver(self, cbFun=None):
|
|
if cbFun is None:
|
|
self.__observers.clear()
|
|
self.__contexts.clear()
|
|
else:
|
|
for execpoint in dict(self.__observers):
|
|
if cbFun in self.__observers[execpoint]:
|
|
self.__observers[execpoint].remove(cbFun)
|
|
if not self.__observers[execpoint]:
|
|
del self.__observers[execpoint]
|
|
|
|
def storeExecutionContext(self, snmpEngine, execpoint, variables):
|
|
self.__execpoints[execpoint] = variables
|
|
if execpoint in self.__observers:
|
|
for cbFun in self.__observers[execpoint]:
|
|
cbFun(snmpEngine, execpoint, variables, self.__contexts[cbFun])
|
|
|
|
def clearExecutionContext(self, snmpEngine, *execpoints):
|
|
if execpoints:
|
|
for execpoint in execpoints:
|
|
del self.__execpoints[execpoint]
|
|
else:
|
|
self.__execpoints.clear()
|
|
|
|
def getExecutionContext(self, execpoint):
|
|
return self.__execpoints[execpoint]
|