[python-win32] HTTP Server as a Windows Service

Fri Feb 22 15:23:51 CET 2008

I've written the following script based on information I have found on the web.  The purpose of the script is to start an HTTP listener on the machine it's running on that will give status on a particular process running on that system that can be polled by an external load balancer to determine if the host is a viable candidate for traffic to be sent to.  For testing, I'm just using notepad.exe as the process I'm looking for.  I've tried to create this as a service on the windows server it's running on, and it will install fine.  The HTTP server starts up and provides the information I want.  The problem I'm having is that the service will not stop when I tell it to.  When I issue the stop request it tries to stop for a long time and throws back an error that it couldn't.  Within the service control panel is just stays in a state of stopping.  Any help that anyone could provide would be greatly appreciated.  I'm new to python so please let me know if there is a more efficient way to do what I'm trying to do.  The code follows: 

import win32service 
import win32serviceutil 
import wmi 
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler 

class BlobCheck(win32serviceutil.ServiceFramework): 
        _svc_name_ = "BlobCheck" 
        _svc_display_name_ = "BlobCheck" 

        def __init__(self,args): 
                win32serviceutil.ServiceFramework.__init__(self,args) 
                self.isAlive = True 

        def SvcDoRun(self): 
                import servicemanager 
                c = wmi.WMI() 

                while self.isAlive: 
                        class RequestHandler(BaseHTTPRequestHandler): 
                                def _writeheaders(self): 
                                        self.send_response(200) 
                                        self.send_header('Content-type', 'text/html') 
                                        self.end_headers() 

                                def do_HEAD(self): 
                                        self._writeheaders() 

                                def do_GET(self): 
                                        self._writeheaders() 
                                        running = c.Win32_Process (name="notepad.exe") 
                                        if running: 
                                                self.wfile.write("""<HTML><HEAD><TITLE>Monitor</TITLE></HEAD> 
                                                <BODY>Kool-Aid!!!</BODY></HTML>""") 
                                        else: 
                                                self.wfile.write("""<HTML><HEAD><TITLE>Monitor</TITLE></HEAD> 
                                                <BODY>Oh No!!!</BODY></HTML>""") 

                        serveraddr = ('', 12345) 
                        srvr = HTTPServer(serveraddr, RequestHandler) 
                        srvr.handle_request() 

        def SvcStop(self): 
                import servicemanager 

                servicemanager.LogInfoMsg("aservice - Recieved stop signal") 
                self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING) 
                self.isAlive = False 

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