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"""
Query Agents from multiple threads
++++++++++++++++++++++++++++++++++
Send a bunch of SNMP GET requests simultaneously using the following options:
* process 5 GET requests in 3 parallel threads
* with SNMPv1, community 'public' and
with SNMPv2c, community 'public' and
with SNMPv3, user 'usr-md5-des', MD5 auth and DES privacy
* over IPv4/UDP and
over IPv6/UDP
* to an Agent at demo.snmplabs.com:161 and
to an Agent at [::1]:161
* for instances of SNMPv2-MIB::sysDescr.0 and
SNMPv2-MIB::sysLocation.0 MIB objects
"""#
from sys import version_info
if version_info[0] == 2:
from Queue import Queue
else:
from queue import Queue
from threading import Thread
from pysnmp.entity.rfc3413.oneliner.cmdgen import *
# List of targets in the followin format:
# ( ( authData, transportTarget, varNames ), ... )
targets = (
# 1-st target (SNMPv1 over IPv4/UDP)
( CommunityData('public', mpModel=0),
UdpTransportTarget(('demo.snmplabs.com', 161)),
( ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)),
ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysLocation', 0)))),
# 2-nd target (SNMPv2c over IPv4/UDP)
( CommunityData('public'),
UdpTransportTarget(('demo.snmplabs.com', 161)),
( ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)),
ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysLocation', 0)))),
# 3-nd target (SNMPv2c over IPv4/UDP) - same community and
# different transport address.
( CommunityData('public'),
UdpTransportTarget(('localhost', 161)),
( ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysContact', 0)),
ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysName', 0)))),
# 4-nd target (SNMPv3 over IPv4/UDP)
( UsmUserData('usr-md5-des', 'authkey1', 'privkey1'),
UdpTransportTarget(('demo.snmplabs.com', 161)),
( ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)),
ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysLocation', 0) ))),
# 5-th target (SNMPv3 over IPv6/UDP)
( UsmUserData('usr-md5-none', 'authkey1'),
Udp6TransportTarget(('::1', 161)),
( ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)),
ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysLocation', 0)))),
# N-th target
# ...
)
class Worker(Thread):
def __init__(self, requests, responses):
Thread.__init__(self)
self.snmpEngine = SnmpEngine()
self.requests = requests
self.responses = responses
self.setDaemon(True)
self.start()
def run(self):
while True:
authData, transportTarget, varBinds = self.requests.get()
self.responses.append(
next(
getCmd(
self.snmpEngine,
authData, transportTarget, ContextData(), *varBinds
)
)
)
if hasattr(self.requests, 'task_done'): # 2.5+
self.requests.task_done()
class ThreadPool:
def __init__(self, num_threads):
self.requests = Queue(num_threads)
self.responses = []
for _ in range(num_threads):
Worker(self.requests, self.responses)
def addRequest(self, authData, transportTarget, varBinds):
self.requests.put((authData, transportTarget, varBinds))
def getResponses(self): return self.responses
def waitCompletion(self):
if hasattr(self.requests, 'join'):
self.requests.join() # 2.5+
else:
from time import sleep
# this is a lame substitute for missing .join()
# adding an explicit synchronization might be a better solution
while not self.requests.empty():
sleep(1)
pool = ThreadPool(3)
# Submit GET requests
for authData, transportTarget, varBinds in targets:
pool.addRequest(authData, transportTarget, varBinds)
# Wait for responses or errors
pool.waitCompletion()
# Walk through responses
for errorIndication, errorStatus, errorIndex, varBinds in pool.getResponses():
print('Response for %s from %s:' % (authData, transportTarget))
if errorIndication:
print(errorIndication)
elif errorStatus:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBinds[int(errorIndex)-1][0] or '?'
)
)
else:
for varBind in varBinds:
print(' = '.join([ x.prettyPrint() for x in varBind ]))
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