python - pysnmp - nextCmd - 不检索下一个元素

Question

我是Python新手。我正在尝试了解 pysnmp 的用法。

我尝试了以下方法:

import asyncio
from pysnmp.hlapi.asyncio import *
from pysnmp import debug

@asyncio.coroutine
def run():
    snmpEngine = SnmpEngine()
    while True:
        errorIndication, errorStatus, errorIndex, varBinds = yield from nextCmd(
            snmpEngine,
            CommunityData('public', mpModel=1),
            UdpTransportTarget(('giga-int-2', 161)),
            ContextData(),
            ObjectType(ObjectIdentity('1.3.6.1.2.1.31.1.1.1.1')),
            lexicographicMode=False
        )

        if errorIndication:
            print(errorIndication)
            break
        elif errorStatus:
            print('%s at %s' % (
                errorStatus.prettyPrint(),
                errorIndex and varBinds[int(errorIndex) - 1][0] or '?')
            )
        else:
            for varBind in varBinds:
                for v in varBind:
                    print(' = '.join([x.prettyPrint() for x in v]))

    snmpEngine.transportDispatcher.closeDispatcher()

asyncio.get_event_loop().run_until_complete(run())

结果我总是得到相同的界面。怎么了？为什么它不检索下一个元素？

SNMPv2-SMI::mib-2.31.1.1.1.1.1 = sc0
SNMPv2-SMI::mib-2.31.1.1.1.1.1 = sc0
SNMPv2-SMI::mib-2.31.1.1.1.1.1 = sc0

Answer 1

这有效。但我想避免显式的 next() 并且它不适合 asyncio

from pysnmp.hlapi import *
from pysnmp import debug
g = nextCmd(
    SnmpEngine(),
    CommunityData('public', mpModel=1),
    UdpTransportTarget(('giga-int-2', 161)),
    ContextData(),
    ObjectType(ObjectIdentity('1.3.6.1.2.1.31.1.1.1.1')),
    lexicographicMode=False
)

while True:
    try:
        errorIndication, errorStatus, errorIndex, varBinds = next(g);
        if errorIndication:
            print(errorIndication)
        elif errorStatus:
            print('%s at %s' % (errorStatus.prettyPrint(), errorIndex and     varBinds[int(errorIndex) - 1][0] or '?'))
        else:
            for name, val in varBinds:
                print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
    except StopIteration:
        break