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Running Python Scripts as Windows Services
In the context of developing a service-based system in Python, the question arises of whether it's possible to run Python scripts as Windows services. This article tackles this query and provides a comprehensive answer.
Indeed, it is feasible to host Python programs as Windows services, leveraging the pythoncom libraries included in ActivePython or via the pywin32 extension. To illustrate this process, consider the following code skeleton for a rudimentary service:
import win32serviceutil import win32service import win32event import servicemanager import socket class AppServerSvc (win32serviceutil.ServiceFramework): _svc_name_ = "TestService" _svc_display_name_ = "Test Service" 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): pass if __name__ == '__main__': win32serviceutil.HandleCommandLine(AppServerSvc)
Insert your custom code into the main() function, typically deploying an infinite loop that can be interrupted by monitoring a flag set in the SvcStop method.
Moreover, Windows is alerted to the existence of your service through the Service Manager. You can monitor and manage it using native Windows utilities like the Services Console (services.msc) or the sc command-line tool. Similar to Unix's /etc/init.d directory for start/stop scripts, Windows uses the scm (Service Control Manager) for managing services. Utilizing the sc utility, you can perform various actions on services, including creating, starting, stopping, and configuring them.
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