eventlet.backdoor 的使用

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import threading
import time
import eventlet
from eventlet import backdoor

eventlet.monkey_patch()

global should_printing
should_printing = True

def turn_off_printing():
global should_printing
should_printing = not should_printing

def printing_function():
global should_printing
n = 0
while True :
if should_printing == True:
print "printing",n
n = n+1
time.sleep(1)

def _dont_use_this():
print("Don't use this, just disconnect instead")

if __name__ == '__main__':

backdoor_locals = {'exit': _dont_use_this,
'quit': _dont_use_this,
'off':turn_off_printing,
}
eventlet.spawn(backdoor.backdoor_server, eventlet.listen(('localhost', 3000)), locals=backdoor_locals)

thread = threading.Thread(target=printing_function)
thread.start()

while(1):
time.sleep(1)

eventlet 提供了一种查看程序运行，debug的方式，称为backdoor  他是在每个程序的后台执行了一个telnet的服务器。这样可以远程登录来查看程序的运行状态。