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|
# MP-specific cache management
from pysnmp.proto import error
class AbstractMessageProcessingModel:
messageProcessingModelID = None
__stateReference = __msgID = 0L
def __init__(self):
self.__msgIdIndex = {}
self.__stateReferenceIndex = {}
self.__sendPduHandleIdx = {}
# Message expiration mechanics
self.__expirationQueue = {}
self.__expirationTimer = 0L
def prepareOutgoingMessage(
self,
snmpEngine,
transportDomain,
transportAddress,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
pdu,
expectResponse,
sendPduHandle
): pass
def prepareResponseMessage(
self,
snmpEngine,
messageProcessingModel,
securityModel,
securityName,
securityLevel,
contextEngineId,
contextName,
pduVersion,
pdu,
maxSizeResponseScopedPDU,
stateReference,
statusInformation
): pass
def prepareDataElements(
self,
snmpEngine,
transportDomain,
transportAddress,
wholeMsg
): pass
def _newStateReference(self):
AbstractMessageProcessingModel.__stateReference = (
AbstractMessageProcessingModel.__stateReference + 1
)
return self.__stateReference
# Server mode cache handling
def _cachePushByStateRef(self, stateReference, **msgInfo):
if self.__stateReferenceIndex.has_key(stateReference):
raise error.ProtocolError(
'Cache dup for stateReference=%s at %s' %
(stateReference, self)
)
expireAt = self.__expirationTimer+50
self.__stateReferenceIndex[stateReference] = ( msgInfo, expireAt )
# Schedule to expire
if not self.__expirationQueue.has_key(expireAt):
self.__expirationQueue[expireAt] = {}
if not self.__expirationQueue[expireAt].has_key('stateReference'):
self.__expirationQueue[expireAt]['stateReference'] = {}
self.__expirationQueue[expireAt]['stateReference'][stateReference] = 1
self.__expireCaches()
def _cachePopByStateRef(self, stateReference):
cacheInfo = self.__stateReferenceIndex.get(stateReference)
if cacheInfo is None:
raise error.ProtocolError(
'Cache miss for stateReference=%s at %s' %
(stateReference, self)
)
del self.__stateReferenceIndex[stateReference]
cacheEntry, expireAt = cacheInfo
del self.__expirationQueue[expireAt]['stateReference'][stateReference]
return cacheEntry
# Client mode cache handling
def _newMsgID(self):
AbstractMessageProcessingModel.__msgID = (
AbstractMessageProcessingModel.__msgID + 1
)
return self.__msgID
def _cachePushByMsgId(self, msgId, **msgInfo):
if self.__msgIdIndex.has_key(msgId):
raise error.ProtocolError(
'Cache dup for msgId=%s at %s' % (msgId, self)
)
expireAt = self.__expirationTimer+50
self.__msgIdIndex[msgId] = ( msgInfo, expireAt )
self.__sendPduHandleIdx[msgInfo['sendPduHandle']] = msgId
# Schedule to expire
if not self.__expirationQueue.has_key(expireAt):
self.__expirationQueue[expireAt] = {}
if not self.__expirationQueue[expireAt].has_key('msgId'):
self.__expirationQueue[expireAt]['msgId'] = {}
self.__expirationQueue[expireAt]['msgId'][msgId] = 1
self.__expireCaches()
def _cachePopByMsgId(self, msgId):
cacheInfo = self.__msgIdIndex.get(msgId)
if cacheInfo is None:
raise error.ProtocolError(
'Cache miss for msgId=%s at %s' % (msgId, self)
)
msgInfo, expireAt = cacheInfo
del self.__sendPduHandleIdx[msgInfo['sendPduHandle']]
del self.__msgIdIndex[msgId]
cacheEntry, expireAt = cacheInfo
del self.__expirationQueue[expireAt]['msgId'][msgId]
return cacheEntry
def _cachePopBySendPduHandle(self, sendPduHandle):
if self.__sendPduHandleIdx.has_key(sendPduHandle):
self._cachePopByMsgId(self.__sendPduHandleIdx[sendPduHandle])
def __expireCaches(self):
# Uses internal clock to expire pending messages
if self.__expirationQueue.has_key(self.__expirationTimer):
cacheInfo = self.__expirationQueue[self.__expirationTimer]
if cacheInfo.has_key('stateReference'):
for stateReference in cacheInfo['stateReference'].keys():
del self.__stateReferenceIndex[stateReference]
if cacheInfo.has_key('msgId'):
for msgId in cacheInfo['msgId'].keys():
del self.__msgIdIndex[msgId]
del self.__expirationQueue[self.__expirationTimer]
self.__expirationTimer = self.__expirationTimer + 1
def releaseStateInformation(self, sendPduHandle):
try:
self._cachePopBySendPduHandle(sendPduHandle)
except error.ProtocolError:
pass # XXX maybe these should all follow some scheme?
|
