winservice.py

"""
SMWinservice
by Davide Mastromatteo

Base class to create winservice in Python
-----------------------------------------

Instructions:

1. Just create a new class that inherits from this base class
2. Define into the new class the variables
   _svc_name_ = "nameOfWinservice"
   _svc_display_name_ = "name of the Winservice that will be displayed in scm"
   _svc_description_ = "description of the Winservice that will be displayed in scm"
3. Override the three main methods:
    def start(self) : if you need to do something at the service initialization.
                      A good idea is to put here the inizialization of the running condition
    def stop(self)  : if you need to do something just before the service is stopped.
                      A good idea is to put here the invalidation of the running condition
    def main(self)  : your actual run loop. Just create a loop based on your running condition
4. Define the entry point of your module calling the method "parse_command_line" of the new class
5. Enjoy
"""

import socket

import servicemanager
import win32event
import win32service
import win32serviceutil


class SMWinservice(win32serviceutil.ServiceFramework):
    """Base class to create winservice in Python"""

    _svc_name_ = "pythonService"
    _svc_display_name_ = "Python Service"
    _svc_description_ = "Python Service Description"

    @classmethod
    def parse_command_line(cls):
        """
        ClassMethod to parse the command line
        """
        win32serviceutil.HandleCommandLine(cls)

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

    def SvcStop(self):
        """
        Called when the service is asked to stop
        """
        self.stop()
        self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
        win32event.SetEvent(self.hWaitStop)

    def SvcDoRun(self):
        """
        Called when the service is asked to start
        """
        self.start()
        servicemanager.LogMsg(
            servicemanager.EVENTLOG_INFORMATION_TYPE,
            servicemanager.PYS_SERVICE_STARTED,
            (self._svc_name_, ""),
        )
        self.main()

    def start(self):
        """
        Override to add logic before the start
        eg. running condition
        """
        pass

    def stop(self):
        """
        Override to add logic before the stop
        eg. invalidating running condition
        """
        pass

    def main(self):
        """
        Main class to be ovverridden to add logic
        """
        pass


# entry point of the module: copy and paste into the new module
# ensuring you are calling the "parse_command_line" of the new created class
if __name__ == "__main__":
    SMWinservice.parse_command_line()