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POTimeout and Windows Services for Long Running Processes (Python)
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copied!<p>I have a simple windows service that I created using python. My issue is that I do not know how long the service is going to take to complete, it could have 15 seconds, or it could take 4+ hours depending on what needs to be done with the data. The 4+ hours is a rare case, but I have had situation where this happens. </p> <p>Below is the general pattern that I've been following for windows services. I took out all the logic, but that's not the issue, and only left a dummy logging command. Is there a way to prevent the service to continuing or not refreshing until the logic portion is completed instead of using the timeout?</p> <pre><code>import win32service import win32serviceutil import win32api import win32con import win32event import win32evtlogutil import os import sys import time import logging class aservice(win32serviceutil.ServiceFramework): _svc_name_ = "WeatherService" _svc_display_name_ = "Weather Service" _svc_description_ = "Downloads weather data from NOAA and creates maps" 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): import servicemanager servicemanager.LogMsg(servicemanager.EVENTLOG_INFORMATION_TYPE, servicemanager.PYS_SERVICE_STARTED,(self._svc_name_, '')) self.timeout = 640000 #640 seconds / 10 minutes (value is in milliseconds) #self.timeout = 120000 #120 seconds / 2 minutes # This is how long the service will wait to run / refresh itself (see script below) while 1: # Wait for service stop signal, if I timeout, loop again rc = win32event.WaitForSingleObject(self.hWaitStop, self.timeout) # Check to see if self.hWaitStop happened if rc == win32event.WAIT_OBJECT_0: # Stop signal encountered servicemanager.LogInfoMsg(self._svc_name_ + " - STOPPED!") #For Event Log break else: #[actual service code between rests] try: logging.basicConfig(filename=r"c:\temp\example.log",level=logging.DEBUG, format='%(asctime)s %(message)s') logging.debug('This message should go to the log file') logging.info('So should this') logging.warning('And this, too') #file_path = "C:\whereever\my_REAL_py_work_to_be_done.py" #execfile(file_path) #Execute the script #inc_file_path2 = "C:\whereever\MORE_REAL_py_work_to_be_done.py" #execfile(inc_file_path2) #Execute the script except: pass #[actual service code between rests] def ctrlHandler(ctrlType): return True if __name__ == '__main__': win32api.SetConsoleCtrlHandler(ctrlHandler, True) win32serviceutil.HandleCommandLine(aservice) </code></pre>

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