Thanks for your help, Larry.
Finally, I got it my python script run as NT service with
the attached python code which is from the site:
http://www.schooltool.org/products/...-a-windows-service/schooltool-service.py/view
##############################################################################
#
# Copyright (c) 2005 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public
License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this
distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND
FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""
Windows NT/2K service installer/controller for Zope/ZEO/ZRS instances.
"""
# With trivial modifications for use with SchoolBell and SchoolTool.
import sys, os, time
import pywintypes
import win32serviceutil
import win32service
import win32event
import win32process
# the max seconds we're allowed to spend backing off
BACKOFF_MAX = 300
# if the process runs successfully for more than BACKOFF_CLEAR_TIME
# seconds, we reset the backoff stats to their initial values
BACKOFF_CLEAR_TIME = 30
# the initial backoff interval (the amount of time we wait to restart
# a dead process)
BACKOFF_INITIAL_INTERVAL = 5
class Service(win32serviceutil.ServiceFramework):
""" A class representing a Windows NT service that can manage an
instance-home-based Zope/ZEO/ZRS processes """
# The comment below is mostly irrelevant if you're running a
standalone
# SchoolBell server, I think. -TEH
# The PythonService model requires that an actual on-disk class
declaration
# represent a single service. Thus, the below definition of
start_cmd,
# must be overridden in a subclass in a file within the instance
home for
# each instance. The below-defined start_cmd (and
_svc_display_name_
# and _svc_name_) are just examples.
# To use this script with SchoolTool, just replace "SchoolBell"
# with "SchoolTool" in the variables below.
# You'll also need to change 'Python24' to 'Python23' if that's
# what you've got. -TEH
_svc_name_ = r'SchoolBell'
_svc_display_name_ = r'SchoolBell Server'
start_cmd = (
r'"C:\Python24\python.exe" '
r'"C:\Program Files\SchoolBell\schoolbell-server.py" '
)
def __init__(self, args):
win32serviceutil.ServiceFramework.__init__(self, args)
# Create an event which we will use to wait on.
# The "service stop" request will set this event.
self.hWaitStop = win32event.CreateEvent(None, 0, 0, None)
self.redirectOutput()
def redirectOutput(self):
sys.stdout.close()
sys.stderr.close()
sys.stdout = NullOutput()
sys.stderr = NullOutput()
def SvcStop(self):
# Before we do anything, tell the SCM we are starting the stop
process.
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
# TODO: This TerminateProcess call doesn't make much sense:
it's
# doing a hard kill _first_, never giving the process a chance
to
# shut down cleanly. Compare to current Zope2 service code,
which
# uses Windows events to give the process a chance to shut down
# cleanly, doing a hard kill only if that doesn't succeed.
# stop the process if necessary
try:
win32process.TerminateProcess(self.hZope, 0)
except pywintypes.error:
# the process may already have been terminated
pass
# And set my event.
win32event.SetEvent(self.hWaitStop)
# SvcStop only gets triggered when the user explictly stops (or
restarts)
# the service. To shut the service down cleanly when Windows is
shutting
# down, we also need to hook SvcShutdown.
SvcShutdown = SvcStop
def createProcess(self, cmd):
return win32process.CreateProcess(
None, cmd, None, None, 0, 0, None, None,
win32process.STARTUPINFO())
def SvcDoRun(self):
# indicate to Zope that the process is daemon managed
(restartable)
os.environ['ZMANAGED'] = '1'
# daemon behavior: we want to to restart the process if it
# dies, but if it dies too many times, we need to give up.
# we use a simple backoff algorithm to determine whether
# we should try to restart a dead process: for each
# time the process dies unexpectedly, we wait some number of
# seconds to restart it, as determined by the backoff interval,
# which doubles each time the process dies. if we exceed
# BACKOFF_MAX seconds in cumulative backoff time, we give up.
# at any time if we successfully run the process for more thab
# BACKOFF_CLEAR_TIME seconds, the backoff stats are reset.
# the initial number of seconds between process start attempts
backoff_interval = BACKOFF_INITIAL_INTERVAL
# the cumulative backoff seconds counter
backoff_cumulative = 0
import servicemanager
# log a service started message
servicemanager.LogMsg(
servicemanager.EVENTLOG_INFORMATION_TYPE,
servicemanager.PYS_SERVICE_STARTED,
(self._svc_name_, ' (%s)' % self._svc_display_name_))
while 1:
start_time = time.time()
info = self.createProcess(self.start_cmd)
self.hZope = info[0] # the pid
if backoff_interval > BACKOFF_INITIAL_INTERVAL:
# if we're in a backoff state, log a message about
# starting a new process
servicemanager.LogInfoMsg(
'%s (%s): recovering from died process, new process
'
'started' % (self._svc_name_,
self._svc_display_name_)
)
rc = win32event.WaitForMultipleObjects(
(self.hWaitStop, self.hZope), 0, win32event.INFINITE)
if rc == win32event.WAIT_OBJECT_0:
# user sent a stop service request
self.SvcStop()
break
else:
# user did not send a service stop request, but
# the process died; this may be an error condition
status = win32process.GetExitCodeProcess(self.hZope)
if status == 0:
# the user shut the process down from the web
# interface (or it otherwise exited cleanly)
break
else:
# this was an abormal shutdown. if we can, we want
to
# restart the process but if it seems hopeless,
# don't restart an infinite number of times.
if backoff_cumulative > BACKOFF_MAX:
# it's hopeless
servicemanager.LogErrorMsg(
'%s (%s): process could not be restarted due
to max '
'restart attempts exceeded' % (
self._svc_display_name_, self._svc_name_
))
self.SvcStop()
break
servicemanager.LogWarningMsg(
'%s (%s): process died unexpectedly. Will
attempt '
'restart after %s seconds.' % (
self._svc_name_, self._svc_display_name_,
backoff_interval
)
)
# if BACKOFF_CLEAR_TIME seconds have elapsed since
we last
# started the process, reset the backoff interval
# and the cumulative backoff time to their original
# states
if time.time() - start_time > BACKOFF_CLEAR_TIME:
backoff_interval = BACKOFF_INITIAL_INTERVAL
backoff_cumulative = 0
# we sleep for the backoff interval. since this is
async
# code, it would be better done by sending and
# catching a timed event (a service
# stop request will need to wait for us to stop
sleeping),
# but this works well enough for me.
time.sleep(backoff_interval)
# update backoff_cumulative with the time we spent
# backing off.
backoff_cumulative = backoff_cumulative +
backoff_interval
# bump the backoff interval up by 2* the last
interval
backoff_interval = backoff_interval * 2
# loop and try to restart the process
# log a service stopped message
servicemanager.LogMsg(
servicemanager.EVENTLOG_INFORMATION_TYPE,
servicemanager.PYS_SERVICE_STOPPED,
(self._svc_name_, ' (%s) ' % self._svc_display_name_))
class NullOutput:
"""A stdout / stderr replacement that discards everything."""
def noop(self, *args, **kw):
pass
write = writelines = close = seek = flush = truncate = noop
def __iter__(self):
return self
def next(self):
raise StopIteration
def isatty(self):
return False
def tell(self):
return 0
def read(self, *args, **kw):
return ''
readline = read
def readlines(self, *args, **kw):
return []
if __name__=='__main__':
win32serviceutil.HandleCommandLine(Service)
