[Twisted-Python] Bootstrapping Servers

[Harald.Nyman at astrazeneca.com]

I do something similar with the help of a shell script - roughly like
 
#!/bin/sh
touch START_SERVER
while [ -f START_SERVER ]
do
  rm START_SERVER
  thisDir=`pwd | gawk -F '/' '{print $NF}'`
  twistd --pidfile=${thisDir}.pid -noy che.tac > /dev/null &
done
echo Server ${thisDir} stopped.

 
--------------------------------------------------------------------
# Close connections, tell clients whether we're stopping or restarting,
......
 
    def _stopServer(self, restart):
        if restart:
            f = open('START_SERVER', 'w')
            f.close()
        reactor.stop()
        sys.exit()

Harald

-----Original Message-----
From: Grant McDonald [mailto:gmcdonald at infocomp.com]
Sent: torsdag, 24 mars 2005 07:38
To: Twisted general discussion (E-mail)
Subject: [Twisted-Python] Bootstrapping Servers



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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