Re: win32 service and time.sleep()
Oracle wrote: On Tue, 20 Sep 2005 10:49:13 -0400, rbt wrote: I have a win32 service written in Python. It works well. It sends a report of the status of the machine via email periodically. The one problem I have is this... while trying to send an email, the script loops until a send happens and then it breaks. Should it be unable to send, it sleeps for 10 minutes with time.sleep(600) and then wakes and tries again. This is when the problem occurs. I can't stop the service while the program is sleeping. When I try, it just hangs until a reboot. Can some suggest how to fix this? You could try doing it the hard way. In a loop, sleep for 1-5 seconds at a time. Everytime you complete a sleep, check the elapsed time. If the elapsed time is = the total sleep duration, fall out of the sleep loop and try your email again. This should allow your service to stop within 1-5 seconds of your request while imposing little to no load on the system. I adopted that solution just last week. When you wake (every few seconds), you check for a stop flag (and exit if needed of course) before checking if its time to do work-work. Works a treat. Another option is to use a threading.Condition, and have the service thread wait(600). The thread that calls to stop the service can set the stop flag and then notify() the Condition. Steve -- http://mail.python.org/mailman/listinfo/python-list
win32 service and time.sleep()
I have a win32 service written in Python. It works well. It sends a report of the status of the machine via email periodically. The one problem I have is this... while trying to send an email, the script loops until a send happens and then it breaks. Should it be unable to send, it sleeps for 10 minutes with time.sleep(600) and then wakes and tries again. This is when the problem occurs. I can't stop the service while the program is sleeping. When I try, it just hangs until a reboot. Can some suggest how to fix this? Thanks, rbt -- http://mail.python.org/mailman/listinfo/python-list
win32 service and time.sleep()
I have a win32 service written in Python. It works well. It sends a report of the status of the machine via email periodically. The one problem I have is this... while trying to send an email, the script loops until a send happens and then it breaks. Should it be unable to send, it sleeps for 10 minutes with time.sleep(600) and then wakes and tries again. This is when the problem occurs. I can't stop the service while the program is sleeping. When I try, it just hangs until a reboot. Can some suggest how to fix this? Thanks, rbt -- http://mail.python.org/mailman/listinfo/python-list
Re: win32 service and time.sleep()
On Tue, 20 Sep 2005 10:49:13 -0400, rbt wrote: I have a win32 service written in Python. It works well. It sends a report of the status of the machine via email periodically. The one problem I have is this... while trying to send an email, the script loops until a send happens and then it breaks. Should it be unable to send, it sleeps for 10 minutes with time.sleep(600) and then wakes and tries again. This is when the problem occurs. I can't stop the service while the program is sleeping. When I try, it just hangs until a reboot. Can some suggest how to fix this? You could try doing it the hard way. In a loop, sleep for 1-5 seconds at a time. Everytime you complete a sleep, check the elapsed time. If the elapsed time is = the total sleep duration, fall out of the sleep loop and try your email again. This should allow your service to stop within 1-5 seconds of your request while imposing little to no load on the system. -- http://mail.python.org/mailman/listinfo/python-list
Re: win32 service and time.sleep()
rbt wrote:
I have a win32 service written in Python. It works well. It sends a
report of the status of the machine via email periodically. The one
problem I have is this... while trying to send an email, the script
loops until a send happens and then it breaks. Should it be unable to
send, it sleeps for 10 minutes with time.sleep(600) and then wakes and
tries again. This is when the problem occurs. I can't stop the service
while the program is sleeping. When I try, it just hangs until a reboot.
Can some suggest how to fix this?
Yes. Generally, most of the win32 services work like this:
- the main thread listens to win32 service commands
- when starting the service, you should create a new worker thread that
does the job for you
- when stopping the service, your service should report
win32service.SERVICE_STOP_PENDING immediately, and ask the worker thread
to terminate
- you should be continuously reporting win32service.SERVICE_STOP_PENDING
until your workder thread has stopped
Here is a simple module that uses a 'Processor' class and a new thread
to do the work.
(The full program is here: http://mess.hu/download/SimpleHTTPService.zip )
class Service(win32serviceutil.ServiceFramework):
_svc_name_ = SERVICE_NAME
_svc_display_name_ = SERVICE_DISPLAY
def __init__(self, args):
win32serviceutil.ServiceFramework.__init__(self, args)
self.stopped = threading.Event()
self.stopped.clear()
self.logger = getLogger(SERVICE_NAME)
def SvcStop(self):
self.logger.info(Got SvcStop, trying to stop service...)
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
self.stopped.set()
def SvcDoRun(self):
Write an event log record - in debug mode we will also see
this message printed.
try:
import servicemanager
servicemanager.LogMsg(
servicemanager.EVENTLOG_INFORMATION_TYPE,
servicemanager.PYS_SERVICE_STARTED,
(self._svc_name_, '')
)
self.logger.info(Started.)
self.logger.debug(Creating processor instance)
processor = Processor(self.stopped)
self.logger.debug(Starting processor thread)
thread.start_new_thread(processor.Process,())
self.logger.debug(Waiting for the processor thread to finish)
self.stopped.wait()
self.logger.debug(Stopping)
time.sleep(1)
while not processor.stopped.isSet():
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING, 5000)
time.sleep(5)
servicemanager.LogMsg(
servicemanager.EVENTLOG_INFORMATION_TYPE,
servicemanager.PYS_SERVICE_STOPPED,
(self._svc_name_, )
)
self.logger.info(Stopped)
except:
self.logger.error('',exc_info = sys.exc_info())
if __name__=='__main__':
win32serviceutil.HandleCommandLine(Service)
--
http://mail.python.org/mailman/listinfo/python-list
Re: win32 service and time.sleep()
rbt wrote: I have a win32 service written in Python. It works well. It sends a report of the status of the machine via email periodically. The one problem I have is this... while trying to send an email, the script loops until a send happens and then it breaks. Should it be unable to send, it sleeps for 10 minutes with time.sleep(600) and then wakes and tries again. This is when the problem occurs. I can't stop the service while the program is sleeping. When I try, it just hangs until a reboot. Can some suggest how to fix this? One way would be to maintain a Queue.Queue containing the messages that need to be sent and, rather than sleeping to retry just retrying when enough time has elapsed. That way you can keep pumping messages and so on to your heart's content, though you will have to keep track of the messages still to be sent. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC www.holdenweb.com PyCon TX 2006 www.pycon.org -- http://mail.python.org/mailman/listinfo/python-list
