PubNub 和 Python 的 multiprocessing.Process 不兼容?
PubNub and Python's multiprocessing.Process not compatible?
我正在尝试使用 Python 的 multiprocessing.Process 包(Python 3.5 on Raspbian 9 - Stretch)在进程内接收来自 PubNub 的消息。
以下作为独立程序或在使用 Python 的线程包的线程中完美运行。但是,它不适用于 multiprocessing.Process.
我是不是遗漏了什么或者 PubNub 的 SubscribeListener 与 Python 的多处理包不兼容?
#!/usr/bin/env python3
from pubnub.pubnub import PubNub, SubscribeListener
from pubnub.pnconfiguration import PNConfiguration
import multiprocessing
import time
def PN_func():
pnconfig = PNConfiguration()
pnconfig.subscribe_key = 'sub-mykey'
pubnub = PubNub(pnconfig)
print('Pubnub multiprocess subscriber initiated...')
class Listener(SubscribeListener):
def message(self, pubnub, data):
print("From Multiprocess function message: ", data.message)
pubnub.add_listener(Listener())
pubnub.subscribe().channels('my_channel').execute()
if __name__ == '__main__':
mp = multiprocessing.Process(target=PN_func)
mp.start()
mp.join()
PubNub 和 Python 多处理
我无法让 SDK 处理多处理工作线程内的同步请求。然而,以下技巧非常有效:
同时使用 Multiprocessing 和 PubNub
简单 example.py
文件包含以下代码:
import multiprocessing
import requests
SUB_KEY = 'demo'
CHANNELS = ['my_channel']
def main():
mp = multiprocessing.Process(target=subscriber)
mp.start()
mp.join()
def subscriber():
timetoken = '0' ## pointer to last message received
while True:
url = "/".join([
'https://ps.pubnub.com/subscribe'
, SUB_KEY
, ",".join(CHANNELS)
, '0'
, timetoken
])
print(url)
response = requests.get(url)
data = response.json()
messages = data[0]
timetoken = data[1]
print(data)
if __name__ == '__main__': main()
多处理子进程的输出
> python example.py
https://ps.pubnub.com/subscribe/demo/my_channel/0/0
[[], u'15336927707090912']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927707090912
[[{u'text': u'hey'}], u'15336927943808959']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927943808959
[[{u'text': u'hey'}], u'15336927945476647']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927945476647
[[{u'text': u'hey'}], u'15336927946996529']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927946996529
[[{u'text': u'hey'}], u'15336927948441519']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927948441519
[[{u'text': u'hey'}], u'15336927950007602']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927950007602
我正在尝试使用 Python 的 multiprocessing.Process 包(Python 3.5 on Raspbian 9 - Stretch)在进程内接收来自 PubNub 的消息。
以下作为独立程序或在使用 Python 的线程包的线程中完美运行。但是,它不适用于 multiprocessing.Process.
我是不是遗漏了什么或者 PubNub 的 SubscribeListener 与 Python 的多处理包不兼容?
#!/usr/bin/env python3
from pubnub.pubnub import PubNub, SubscribeListener
from pubnub.pnconfiguration import PNConfiguration
import multiprocessing
import time
def PN_func():
pnconfig = PNConfiguration()
pnconfig.subscribe_key = 'sub-mykey'
pubnub = PubNub(pnconfig)
print('Pubnub multiprocess subscriber initiated...')
class Listener(SubscribeListener):
def message(self, pubnub, data):
print("From Multiprocess function message: ", data.message)
pubnub.add_listener(Listener())
pubnub.subscribe().channels('my_channel').execute()
if __name__ == '__main__':
mp = multiprocessing.Process(target=PN_func)
mp.start()
mp.join()
PubNub 和 Python 多处理
我无法让 SDK 处理多处理工作线程内的同步请求。然而,以下技巧非常有效:
同时使用 Multiprocessing 和 PubNub
简单 example.py
文件包含以下代码:
import multiprocessing
import requests
SUB_KEY = 'demo'
CHANNELS = ['my_channel']
def main():
mp = multiprocessing.Process(target=subscriber)
mp.start()
mp.join()
def subscriber():
timetoken = '0' ## pointer to last message received
while True:
url = "/".join([
'https://ps.pubnub.com/subscribe'
, SUB_KEY
, ",".join(CHANNELS)
, '0'
, timetoken
])
print(url)
response = requests.get(url)
data = response.json()
messages = data[0]
timetoken = data[1]
print(data)
if __name__ == '__main__': main()
多处理子进程的输出
> python example.py
https://ps.pubnub.com/subscribe/demo/my_channel/0/0
[[], u'15336927707090912']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927707090912
[[{u'text': u'hey'}], u'15336927943808959']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927943808959
[[{u'text': u'hey'}], u'15336927945476647']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927945476647
[[{u'text': u'hey'}], u'15336927946996529']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927946996529
[[{u'text': u'hey'}], u'15336927948441519']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927948441519
[[{u'text': u'hey'}], u'15336927950007602']
https://ps.pubnub.com/subscribe/demo/my_channel/0/15336927950007602