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#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2020, Ilya Etingof <etingof@gmail.com>
# License: https://www.pysnmp.com/pysnmp/license.html
#
from typing import Any, Dict
from pysnmp import nextid
from pysnmp.proto import error
class Cache:
"""SNMP securityData cache."""
__state_reference = nextid.Integer(0xFFFFFF)
__cache_entries: Dict[int, Any]
def __init__(self):
"""Create a cache object."""
self.__cache_entries = {}
def push(self, **securityData):
"""Push securityData into cache."""
stateReference = self.__state_reference()
self.__cache_entries[stateReference] = securityData
return stateReference
def pop(self, stateReference):
"""Pop securityData from cache."""
if stateReference in self.__cache_entries:
securityData = self.__cache_entries[stateReference]
else:
raise error.ProtocolError(
f"Cache miss for stateReference={stateReference} at {self}"
)
del self.__cache_entries[stateReference]
return securityData
def is_empty(self):
"""Return True if cache is empty."""
return not bool(self.__cache_entries)
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