Python django芹菜和asyncio-loop参数必须大约每3分钟与Future一致
我使用django芹菜和芹菜节拍来运行定期任务。我每一分钟运行一次任务,通过SNMP获取一些数据 我的函数使用asyncio,如下所示。我在代码中做了一个检查,检查循环是否闭合,并创建一个新的循环 但似乎每隔几次任务就会发生一次,我就会失败,在Django tasks results db中,我有下面的回溯。似乎每3分钟就有一次失败,但每分钟都有成功,没有失败 错误:Python django芹菜和asyncio-loop参数必须大约每3分钟与Future一致,python,django,celery,python-asyncio,Python,Django,Celery,Python Asyncio,我使用django芹菜和芹菜节拍来运行定期任务。我每一分钟运行一次任务,通过SNMP获取一些数据 我的函数使用asyncio,如下所示。我在代码中做了一个检查,检查循环是否闭合,并创建一个新的循环 但似乎每隔几次任务就会发生一次,我就会失败,在Django tasks results db中,我有下面的回溯。似乎每3分钟就有一次失败,但每分钟都有成功,没有失败 错误: Traceback (most recent call last): File "/usr/local/lib/python
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/celery/app/trace.py", line 374, in trace_task
R = retval = fun(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/celery/app/trace.py", line 629, in __protected_call__
return self.run(*args, **kwargs)
File "/itapp/itapp/monitoring/tasks.py", line 32, in link_data
return get_link_data()
File "/itapp/itapp/monitoring/jobs/link_monitoring.py", line 209, in get_link_data
done, pending = loop.run_until_complete(asyncio.wait(tasks))
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 468, in run_until_complete
return future.result()
File "/usr/local/lib/python3.6/asyncio/tasks.py", line 311, in wait
fs = {ensure_future(f, loop=loop) for f in set(fs)}
File "/usr/local/lib/python3.6/asyncio/tasks.py", line 311, in <setcomp>
fs = {ensure_future(f, loop=loop) for f in set(fs)}
File "/usr/local/lib/python3.6/asyncio/tasks.py", line 514, in ensure_future
raise ValueError('loop argument must agree with Future')
ValueError: loop argument must agree with Future
从用户4815162342建议的这些URL 运行ascync函数时,除在内存中运行的函数外,任何输入输出操作都需要异步兼容。(在我的示例中是regex查询) i、 e任何需要从另一个源(在我的示例中是django查询)收集数据的非异步兼容函数都必须在执行器中运行 我想我现在已经通过在executors中运行所有django DB调用修复了我的问题,从那以后,我再也没有遇到过运行临时脚本的问题
但是,我对芹菜和async有兼容性问题(因为芹菜与asyncio尚不兼容,这会引发一些错误,但不是我以前看到的错误)这似乎与您之前提出的问题完全相同,然后被删除。设计似乎有缺陷,首先是您的协同程序不等待
asyncio.sleep()
之外的任何东西。抱歉,我删除了原始问题,因为脚本在经过一些调整后工作了,我认为在这一点上,它工作了2/3次,一切正常。我是Asyncio新手,所以我不太清楚你的意思?我需要该函数在snmp轮询之间等待60秒以收集数据我们已经在原始问题中进行了此对话,我回答说您应该等待任何可能阻塞的操作。我还向你介绍了更多的信息。这两本书我至少读了三遍,对于一个新手来说,这很让人困惑,但从我的理解来看,我认为我的脚本还可以,当它起作用时,我就这样认为了。我不确定我在那里有任何阻塞操作。阻塞操作需要50毫秒以上的时间吗?是这样吗?如果我有其中一个,它应该在执行器中运行?阻塞操作是任何可能等待任意时间的操作,例如,任何依赖于网络延迟或服务器响应的操作。如果您不使用与asyncio兼容的库,也不等待阻塞调用,那么使用asyncio不会给您带来任何好处。您得不到并行性,并且也得到了异常,可能是由于与某些库内部使用的另一个事件循环冲突。尝试使用普通的def
而不是async def
来检索数据并将wait asyncio.sleep()
替换为time.sleep()
。
async def retrieve_data(link):
poll_interval = 60
results = []
# credentials:
link_mgmt_ip = link.mgmt_ip
link_index = link.interface_index
snmp_user = link.device_circuit_subnet.device.snmp_data.name
snmp_auth = link.device_circuit_subnet.device.snmp_data.auth
snmp_priv = link.device_circuit_subnet.device.snmp_data.priv
hostname = link.device_circuit_subnet.device.hostname
print('polling data for {} on {}'.format(hostname,link_mgmt_ip))
# first poll for speeds
download_speed_data_poll1 = snmp_get(link_mgmt_ip, down_speed_oid % link_index ,snmp_user, snmp_auth, snmp_priv)
# check we were able to poll
if 'timeout' in str(get_snmp_value(download_speed_data_poll1)).lower():
return 'timeout trying to poll {} - {}'.format(hostname ,link_mgmt_ip)
upload_speed_data_poll1 = snmp_get(link_mgmt_ip, up_speed_oid % link_index, snmp_user, snmp_auth, snmp_priv)
# wait for poll interval
await asyncio.sleep(poll_interval)
# second poll for speeds
download_speed_data_poll2 = snmp_get(link_mgmt_ip, down_speed_oid % link_index, snmp_user, snmp_auth, snmp_priv)
upload_speed_data_poll2 = snmp_get(link_mgmt_ip, up_speed_oid % link_index, snmp_user, snmp_auth, snmp_priv)
# create deltas for speed
down_delta = int(get_snmp_value(download_speed_data_poll2)) - int(get_snmp_value(download_speed_data_poll1))
up_delta = int(get_snmp_value(upload_speed_data_poll2)) - int(get_snmp_value(upload_speed_data_poll1))
# set speed results
download_speed = round((down_delta * 8 / poll_interval) / 1048576)
upload_speed = round((up_delta * 8 / poll_interval) / 1048576)
# get description and interface state
int_desc = snmp_get(link_mgmt_ip, int_desc_oid % link_index, snmp_user, snmp_auth, snmp_priv)
int_state = snmp_get(link_mgmt_ip, int_state_oid % link_index, snmp_user, snmp_auth, snmp_priv)
...
return results
def get_link_data():
mgmt_ip = Subquery(
DeviceCircuitSubnets.objects.filter(device_id=OuterRef('device_circuit_subnet__device_id'),subnet__subnet_type__poll=True).values('subnet__subnet')[:1])
link_data = LinkTargets.objects.all() \
.select_related('device_circuit_subnet') \
.select_related('device_circuit_subnet__device') \
.select_related('device_circuit_subnet__device__snmp_data') \
.select_related('device_circuit_subnet__subnet') \
.select_related('device_circuit_subnet__circuit') \
.annotate(mgmt_ip=mgmt_ip)
tasks = []
loop = asyncio.get_event_loop()
if asyncio.get_event_loop().is_closed():
loop = asyncio.new_event_loop()
asyncio.set_event_loop(asyncio.new_event_loop())
for link in link_data:
tasks.append(asyncio.ensure_future(retrieve_data(link)))
if tasks:
start = time.time()
done, pending = loop.run_until_complete(asyncio.wait(tasks))
loop.close()
results = []
for completed_task in done:
results.append(completed_task.result()[0])
end = time.time()
print("Poll time: {}".format(end - start))
return 'Link data updated for {}'.format(' \n '.join(results))
else:
return 'no tasks defined'