[Twisted-Python] Bootstrapping Servers

[Grant McDonald]

Dear All,

I have created some code to close all active connections to a server, spawn
a new instance of itself and call reactor.stop() to facilitate a remote
bootstrap restart of a server. The bootstrapping process takes place through
a loader where if passed an option to bootstrap the code pauses for 20 secs
to allow the previous process to exit:

import sys

if sys.argv[1] == "--bootstrap" or sys.argv[1] == "-b":
    print 'bootstrapping'
    del sys.argv[1]
    import time
    time.sleep(20.0)

from twisted.python.runtime import platformType
if platformType == "win32":
    from twisted.scripts.twistw import run
else:
    from twisted.scripts.twistd import run

run()

However the above code does not allow the server to start since twistd
complains that the port is in use:

2005/03/24 17:14 AUS Eastern Daylight Time [-] Log opened.
2005/03/24 17:14 AUS Eastern Daylight Time [-] twistd 1.3.0
(C:\Python23\python.exe 2.3.3) starting up
2005/03/24 17:14 AUS Eastern Daylight Time [-] reactor class:
twisted.internet.default.SelectReactor
2005/03/24 17:14 AUS Eastern Daylight Time [-] managers.ConnectionManager
starting on 12005
2005/03/24 17:14 AUS Eastern Daylight Time [-] Traceback (most recent call
last):
2005/03/24 17:14 AUS Eastern Daylight Time [-]   File "D:\python
projects\programs\zcfscheduler\loader.py", line 15, in ?
2005/03/24 17:14 AUS Eastern Daylight Time [-]     run()

<-- snip -->

2005/03/24 17:14 AUS Eastern Daylight Time [-]     return getattr(reactor,
'listen'+self.method)(*self.args, **self.kwargs)
2005/03/24 17:14 AUS Eastern Daylight Time [-]   File
"C:\Python23\lib\site-packages\twisted\internet\default.py", line 283, in
listenTCP
2005/03/24 17:14 AUS Eastern Daylight Time [-]     p.startListening()
2005/03/24 17:14 AUS Eastern Daylight Time [-]   File
"C:\Python23\lib\site-packages\twisted\internet\tcp.py", line 594, in
startListening
2005/03/24 17:14 AUS Eastern Daylight Time [-]     raise CannotListenError,
(self.interface, self.port, le)
2005/03/24 17:14 AUS Eastern Daylight Time [-]
twisted.internet.error.CannotListenError: Couldn't listen on any:12005:
(10048, 'Address already in use').

how can i get the server to stop, restart itself and release the port in the
process?

Regards,

Grant McDonald

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