Python asyncio“;任务已被销毁,但它处于挂起状态&引用;在pysnmp示例程序中
我正在测试pysnmp异步IO模块,并在开始时使用随文档提供的。当我运行示例程序时,它给出了Python asyncio“;任务已被销毁,但它处于挂起状态&引用;在pysnmp示例程序中,python,python-3.x,python-asyncio,pysnmp,Python,Python 3.x,Python Asyncio,Pysnmp,我正在测试pysnmp异步IO模块,并在开始时使用随文档提供的。当我运行示例程序时,它给出了任务已被销毁,但它处于挂起状态错误。我检查了类似的问题,没有发现我(没有经验的)眼睛有什么问题。我正在使用Python 3.4.2和它附带的asyncio,以及Debian 8.5上的pysnmp(4.3.2) 我使用的程序(与pysnmp文档中的示例程序相同) 导入异步 从pysnmp.hlapi.asyncio导入* @异步协同程序 def getone(snmpEngine,主机名): error
任务已被销毁,但它处于挂起状态代码>错误。我检查了类似的问题,没有发现我(没有经验的)眼睛有什么问题。我正在使用Python 3.4.2和它附带的asyncio,以及Debian 8.5上的pysnmp(4.3.2)
我使用的程序(与pysnmp文档中的示例程序相同)
导入异步
从pysnmp.hlapi.asyncio导入*
@异步协同程序
def getone(snmpEngine,主机名):
errorIndication、errorStatus、errorIndex、varBinds=从getCmd获得的收益(
snmpEngine,
CommunityData(“公共”),
UDPTTransportTarget(主机名),
ContextData(),
ObjectType(ObjectIdentity('SNMPv2-MIB','sysDescr',0))
)
如果错误指示:
打印(错误指示)
elif错误状态:
打印(“%s”位于%s'%(
errorStatus.prettyPrint(),
errorIndex和varBinds[int(errorIndex)-1][0]或“?”
)
)
其他:
对于varBind中的varBind:
打印('='.join([x.prettyPrint()用于varBind中的x]))
@异步协同程序
def getall(snmpEngine,主机名):
对于主机名中的主机名:
来自getone的收益(snmpEngine,主机名)
snmpEngine=snmpEngine()
loop=asyncio.get\u event\u loop()
循环运行直到完成(getall(snmpEngine,[('demo.snmplabs.com',1161),
('demo.snmplabs.com',2161),
('demo.snmplabs.com',3161)])
错误是:
Executing wait_for= cb=[_raise_stop_error() at /usr/lib/python3.4/asyncio/base_event
s.py:101] created at /usr/lib/python3.4/asyncio/base_events.py:264> took 0.460 seconds
SNMPv2-MIB::sysDescr.0 = SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m
SNMPv2-MIB::sysDescr.0 = SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m
SNMPv2-MIB::sysDescr.0 = SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m
Task was destroyed but it is pending!
source_traceback: Object created at (most recent call last):
File "multiple-sequential-queries.py", line 58, in
('demo.snmplabs.com', 3161)]))
File "/usr/lib/python3.4/asyncio/base_events.py", line 271, in run_until_complete
self.run_forever()
File "/usr/lib/python3.4/asyncio/base_events.py", line 244, in run_forever
self._run_once()
File "/usr/lib/python3.4/asyncio/base_events.py", line 1075, in _run_once
handle._run()
File "/usr/lib/python3.4/asyncio/events.py", line 120, in _run
self._callback(*self._args)
File "/usr/lib/python3.4/asyncio/tasks.py", line 237, in _step
result = next(coro)
File "/usr/lib/python3.4/asyncio/coroutines.py", line 79, in __next__
return next(self.gen)
File "multiple-sequential-queries.py", line 50, in getall
yield from getone(snmpEngine, hostname)
File "/usr/lib/python3.4/asyncio/coroutines.py", line 79, in __next__
return next(self.gen)
File "multiple-sequential-queries.py", line 31, in getone
ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0))
File "/usr/lib/python3.4/asyncio/coroutines.py", line 79, in __next__
return next(self.gen)
File "/usr/lib/python3.4/asyncio/coroutines.py", line 141, in coro
res = func(*args, **kw)
File "/usr/local/lib/python3.4/dist-packages/pysnmp/hlapi/asyncio/cmdgen.py", line 138, in getCmd
addrName, paramsName = lcd.configure(snmpEngine, authData, transportTarget)
File "/usr/local/lib/python3.4/dist-packages/pysnmp/hlapi/lcd.py", line 87, in configure
transport
File "/usr/local/lib/python3.4/dist-packages/pysnmp/entity/config.py", line 308, in addTransport
transport)
File "/usr/local/lib/python3.4/dist-packages/pysnmp/carrier/asyncio/dispatch.py", line 70, in registerTransport
self.loopingcall = asyncio.async(self.handle_timeout())
task: :4> wait_for= created at /usr/local/lib/python3.4/dist-packages/pysnmp/carrier/asyncio/dispatch.py:70>
非常感谢您的帮助
谢谢。pysnmp中有一个内部计时器功能,用于处理缓存、重试等。通过异步IO传输,计时器由异步IO未来
驱动。您观察到的消息警告您,在主循环关闭之前,Future对象仍处于挂起状态
要解决此问题,您需要在完成所有SNMP I/O后取消挂起的计时器任务。一种[hackerish]方法是将以下代码段附加到您提到的示例脚本中:
...
snmpEngine = SnmpEngine()
loop = asyncio.get_event_loop()
loop.run_until_complete(getall(snmpEngine, [('demo.snmplabs.com', 1161),
('demo.snmplabs.com', 2161),
('demo.snmplabs.com', 3161)]))
# run a coroutine to cancel pending timer task
from pysnmp.hlapi.asyncore.cmdgen import lcd
@asyncio.coroutine
def unconfigure(snmpEngine, authData=None):
lcd.unconfigure(snmpEngine, authData)
loop.run_until_complete(unconfigure(snmpEngine))
我正在努力将类似的协同程序添加到pysnmp中,这样您就可以直接运行它。这看起来像pysnmp中的一个错误,与关机时定期定时器功能取消有关。这里有更多关于这件事的信息。在github上发布一期或发送PR可能是一个不错的选择。;)谢谢让我打开一个问题。