ewok ewok - 18 days ago 8
Python Question

Problems running a python script as a service

I have used this question to learn install my python script as a service with ActivePython. I am able to install my script and remove it, as I would expect, but my problem is that once I start the script running, I then lose the ability to stop it or remove it. It just runs permanently and I cannot get rid of it. The answer to the linked question mentions checking a flag to stop the script. Can someone explain how to do this?

Right now the script does very little. just prints lines to a file every few seconds. I want to get it working before I move on to more complicated things.

import pythoncom
import win32serviceutil
import win32service
import win32event
import servicemanager
import socket
import time


class AppServerSvc (win32serviceutil.ServiceFramework):
_svc_name_ = "PythonTest"
_svc_display_name_ = "Python Test"
_svc_description_ = "This is a test of installing Python services"

def __init__(self,args):
win32serviceutil.ServiceFramework.__init__(self,args)
self.hWaitStop = win32event.CreateEvent(None,0,0,None)
socket.setdefaulttimeout(60)

def SvcStop(self):
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
win32event.SetEvent(self.hWaitStop)

def SvcDoRun(self):
servicemanager.LogMsg(servicemanager.EVENTLOG_INFORMATION_TYPE,
servicemanager.PYS_SERVICE_STARTED,
(self._svc_name_,''))
self.main()

def main(self):
i=0
while True:
f=open("C:\\hello.txt","a")
f.write("hello"+str(i)+"\n")
f.close()
i=i+1
time.sleep(5)


if __name__ == '__main__':
win32serviceutil.HandleCommandLine(AppServerSvc)

Answer

Of course you can't stop it, you're stuck in an infinite loop. Replace:

time.sleep(5)

with this:

if win32event.WaitForSingleObject(self.hWaitStop, 5000) == win32event.WAIT_OBJECT_0: 
    break

Should do the trick.