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#
# This file is part of snmpsim software.
#
# Copyright (c) 2010-2019, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/snmpsim/license.html
#
# Managed value variation module
# Simulate a numeric value
# Valid values in module options are:
# 2 - Integer
# 65 - Counter32
# 66 - Gauge32
# 67 - TimeTicks
# 70 - Counter64
import math
import time
import random
from pysnmp.proto import rfc1902
from snmpsim.mltsplit import split
from snmpsim import log
from snmpsim import error
tboot = time.time()
def init(**context):
if context['mode'] == 'variating':
random.seed()
if context['mode'] == 'recording':
moduleContext['settings'] = {}
if context['options']:
for k, v in [split(x, ':') for x in split(context['options'], ',')]:
if k == 'addon':
if k in moduleContext['settings']:
moduleContext['settings'][k].append(v)
else:
moduleContext['settings'][k] = [v]
else:
moduleContext['settings'][k] = v
if 'iterations' in moduleContext['settings']:
moduleContext['settings']['iterations'] = int(moduleContext['settings']['iterations'])
if moduleContext['settings']['iterations']:
moduleContext['settings']['iterations'] = 1 # no reason for more
if 'period' in moduleContext['settings']:
moduleContext['settings']['period'] = float(moduleContext['settings']['period'])
else:
moduleContext['settings']['period'] = 10.0
if 'taglist' not in moduleContext['settings']:
moduleContext['settings']['taglist'] = '2-65-66-67-70'
def variate(oid, tag, value, **context):
if not context['nextFlag'] and not context['exactMatch']:
return context['origOid'], tag, context['errorStatus']
if context['setFlag']:
return context['origOid'], tag, context['errorStatus']
if 'settings' not in recordContext:
recordContext['settings'] = dict([split(x, '=') for x in split(value, ',')])
for k in recordContext['settings']:
if k != 'function':
recordContext['settings'][k] = float(recordContext['settings'][k])
if 'min' not in recordContext['settings']:
recordContext['settings']['min'] = 0
if 'max' not in recordContext['settings']:
if tag == '70':
recordContext['settings']['max'] = 0xffffffffffffffff
else:
recordContext['settings']['max'] = 0xffffffff
if 'rate' not in recordContext['settings']:
recordContext['settings']['rate'] = 1
if 'function' in recordContext['settings']:
f = split(recordContext['settings']['function'], '%')
recordContext['settings']['function'] = getattr(math, f[0]), f[1:]
else:
recordContext['settings']['function'] = lambda x: x, ()
vold, told = recordContext['settings'].get('initial', recordContext['settings']['min']), tboot
if 'cumulative' in recordContext['settings']:
if 'value' not in recordContext:
recordContext['value'] = vold, told
vold, told = recordContext['value']
tnow = time.time()
if 'atime' in recordContext['settings']:
t = tnow
else:
t = tnow - tboot
f, args = recordContext['settings']['function']
_args = []
if args:
for x in args:
if x == '<time>':
_args.append(t * recordContext['settings']['rate'])
else:
_args.append(float(x))
else:
_args.append(t * recordContext['settings']['rate'])
v = f(*_args)
if 'scale' in recordContext['settings']:
v *= recordContext['settings']['scale']
if 'offset' in recordContext['settings']:
if 'cumulative' in recordContext['settings']:
v += recordContext['settings']['offset'] * (tnow - told) * recordContext['settings']['rate']
else:
v += recordContext['settings']['offset']
if 'deviation' in recordContext['settings'] and recordContext['settings']['deviation']:
v += random.randrange(-recordContext['settings']['deviation'], recordContext['settings']['deviation'])
if 'cumulative' in recordContext['settings']:
v = max(v, 0)
v += vold
if v < recordContext['settings']['min']:
v = recordContext['settings']['min']
elif v > recordContext['settings']['max']:
if 'wrap' in recordContext['settings']:
v %= recordContext['settings']['max']
v += recordContext['settings']['min']
else:
v = recordContext['settings']['max']
if 'cumulative' in recordContext['settings']:
recordContext['value'] = v, tnow
return oid, tag, v
def record(oid, tag, value, **context):
if 'started' not in moduleContext:
moduleContext['started'] = time.time()
if 'iterations' not in moduleContext:
moduleContext['iterations'] = min(1, moduleContext['settings'].get('iterations', 0))
# single-run recording
if 'iterations' not in moduleContext['settings'] or not moduleContext['settings']['iterations']:
if context['origValue'].tagSet not in (
rfc1902.Counter32.tagSet,
rfc1902.Counter64.tagSet,
rfc1902.TimeTicks.tagSet,
rfc1902.Gauge32.tagSet,
rfc1902.Integer.tagSet):
if 'hextag' in context:
tag = context['hextag']
if 'hexvalue' in context:
value = context['hexvalue']
return oid, tag, value
if ('taglist' not in moduleContext['settings'] or
tag not in moduleContext['settings']['taglist']):
return oid, tag, value
value = 'initial=%s' % value
if context['origValue'].tagSet == rfc1902.TimeTicks.tagSet:
value += ',rate=100'
elif context['origValue'].tagSet == rfc1902.Integer.tagSet:
value += ',rate=0'
return oid, tag + ':numeric', value
# multiple-iteration recording
if oid not in moduleContext:
settings = {
'initial': value
}
if context['origValue'].tagSet == rfc1902.TimeTicks.tagSet:
settings['rate'] = 100
elif context['origValue'].tagSet == rfc1902.Integer.tagSet:
settings['rate'] = 0 # may be constants
if 'addon' in moduleContext['settings']:
settings.update(
dict([split(x, '=') for x in moduleContext['settings']['addon']])
)
moduleContext[oid] = {}
moduleContext[oid]['settings'] = settings
if moduleContext['iterations']:
if context['stopFlag']: # switching to final iteration
log.msg('numeric: %s iterations remaining' % moduleContext['settings']['iterations'])
moduleContext['iterations'] -= 1
moduleContext['started'] = time.time()
wait = max(0, float(moduleContext['settings']['period']) - (time.time() - moduleContext['started']))
raise error.MoreDataNotification(period=wait)
else: # storing values on first iteration
moduleContext[oid]['time'] = time.time()
moduleContext[oid]['value'] = context['origValue']
if 'hexvalue' in moduleContext[oid]:
moduleContext[oid]['hexvalue'] = context['hexvalue']
if 'hextag' in moduleContext[oid]:
moduleContext[oid]['hextag'] = context['hextag']
raise error.NoDataNotification()
else:
if context['stopFlag']:
raise error.NoDataNotification()
if 'value' in moduleContext[oid]:
if context['origValue'].tagSet not in (
rfc1902.Counter32.tagSet,
rfc1902.Counter64.tagSet,
rfc1902.TimeTicks.tagSet,
rfc1902.Gauge32.tagSet,
rfc1902.Integer.tagSet):
if 'hextag' in moduleContext[oid]:
tag = moduleContext[oid]['hextag']
if 'hexvalue' in moduleContext[oid]:
value = moduleContext[oid]['hexvalue']
return oid, tag, value
if tag not in moduleContext['settings']['taglist']:
return oid, tag, moduleContext[oid]['value']
moduleContext[oid]['settings']['rate'] = (int(context['origValue']) - int(moduleContext[oid]['value'])) / (time.time() - moduleContext[oid]['time'])
tag += ':numeric'
value = ','.join(
['%s=%s' % (k, v) for k, v in moduleContext[oid]['settings'].items()]
)
return oid, tag, value
else:
raise error.NoDataNotification()
def shutdown(**context):
pass
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