[Twisted-Python] NT Service

[Bob Ippolito]

On Wednesday, Mar 5, 2003, at 13:15 America/New_York, Thad Jacobs wrote:

> Hello All,
>
> I've created a module that makes COM calls to our non-sql database 
> using
> win32com, and converts the results to XML format (through simple string
> concatenations).  I've created a rpy script that calls this module, and
> returns the XML to the browser.
>
> I am currently running the HTTP server per the introduction using the
> command line.
>
> My question:
>
> How should I best deploy this application into a production 
> environment?  It
> will be running on an Windows 2000 server, and needs to automatically 
> load
> and run before anyone logs on in the machine.  Is there a way I can 
> deploy
> Twisted Web as an NT service?  Are there other web servers (besides 
> IIS)
> that can be configured to run my rpy script and still allow me to 
> utilize
> win32com in my class module?

I'm assuming you've already RTFM'ed about win32all's win32service and 
Twisted.  Here's a stripped example of what has worked very well for me 
for the few times I was forced to deploy under Windows:

import win32serviceutil
import win32service
import win32event
class MyTwistedService(win32serviceutil.ServiceFramework):
   _svc_name_ = "MyTwistedService"
   _svc_display_name_ = "Example Twisted NT Service"
   def __init__(self, args):
     win32serviceutil.ServiceFramework.__init__(self, args)
     self.hWaitStop = win32event.CreateEvent(None, 0, 0, None)

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

   def SvcDoRun(self):
     from twisted.python.log import startLogging
     # we don't have the console, so we log somewhere
     # the NT service logging facilities probably isn't the right place
     startLogging(open('c:/twistedexample.log','a'))
     self.CheckForQuit()
     startTwisted()

   def CheckForQuit(self):
     #print "Check For Quit"
     rv = win32event.WaitForSingleObject(self.hWaitStop, 10.0)
     if not rv == win32event.WAIT_TIMEOUT:
       print "Received Quit from Win32"
       reactor.stop()
     reactor.callLater(1.0, self.CheckForQuit)

def startTwisted():
   from twisted.internet.app import Application
   app = Application("MyExampleTwistedService")
   app.run(save=0)
   print "Finished"

if __name__=='__main__':
   # you could call startTwisted to run as not-a-service
   # or use it for cross-platform reasons
   win32serviceutil.HandleCommandLine(MyTwistedService)