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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
# License: https://www.pysnmp.com/pysnmp/license.html
#
from pyasn1.type import univ
from pyasn1.compat.octets import null
from pysnmp import error
from pysnmp import debug
class SnmpContext:
def __init__(self, snmpEngine, contextEngineId=None):
snmpEngineId, = snmpEngine.msgAndPduDsp.mibInstrumController.mibBuilder.importSymbols('__SNMP-FRAMEWORK-MIB',
'snmpEngineID')
if contextEngineId is None:
# Default to local snmpEngineId
self.contextEngineId = snmpEngineId.syntax
else:
self.contextEngineId = snmpEngineId.syntax.clone(contextEngineId)
debug.logger & debug.flagIns and debug.logger(f'SnmpContext: contextEngineId \"{self.contextEngineId!r}\"')
self.contextNames = {
null: snmpEngine.msgAndPduDsp.mibInstrumController # Default name
}
def registerContextName(self, contextName, mibInstrum=None):
contextName = univ.OctetString(contextName).asOctets()
if contextName in self.contextNames:
raise error.PySnmpError(
'Duplicate contextName %s' % contextName
)
debug.logger & debug.flagIns and debug.logger(
f'registerContextName: registered contextName {contextName!r}, mibInstrum {mibInstrum!r}')
if mibInstrum is None:
self.contextNames[contextName] = self.contextNames[null]
else:
self.contextNames[contextName] = mibInstrum
def unregisterContextName(self, contextName):
contextName = univ.OctetString(contextName).asOctets()
if contextName in self.contextNames:
debug.logger & debug.flagIns and debug.logger(
'unregisterContextName: unregistered contextName %r' % contextName)
del self.contextNames[contextName]
def getMibInstrum(self, contextName=null):
contextName = univ.OctetString(contextName).asOctets()
if contextName not in self.contextNames:
debug.logger & debug.flagIns and debug.logger('getMibInstrum: contextName %r not registered' % contextName)
raise error.PySnmpError(
'Missing contextName %s' % contextName
)
else:
debug.logger & debug.flagIns and debug.logger(
f'getMibInstrum: contextName {contextName!r}, mibInstum {self.contextNames[contextName]!r}')
return self.contextNames[contextName]
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