Many thanks! I will not perform the detection rely on this way.
On Friday, July 20, 2012 2:09:31 PM UTC+8, Graham Dumpleton wrote:
There isn't really a way. You can read past discussions on this in the
group archives about points where closure may be detected. One such
discussion is:
https://groups.google.com/d/msg/modwsgi/jr2ayp0xesk/QtINxMi_KUAJ
Graham
On 19 July 2012 22:55, lvqier wrote:
I am confused with the following code (test.py), which is a wsgi
application:
#!/usr/bin/env python
from subprocess import Popen, PIPE
import os
cwd = os.path.dirname(os.path.abspath(__file__))
exe = os.path.join(cwd, 'wait.py')
def application(environ, start_response):
process_args = ['python', exe, cwd, '10']
process = Popen(process_args, stdout = PIPE, stderr = PIPE)
process.wait()
start_response('200 OK', [('Content-Type', 'text/plain'),])
return ['finished']
where wait.py is:
#!/usr/bin/env python
import pyinotify
class iNotifyEventHandler(pyinotify.ProcessEvent):
def process_IN_CLOSE_WRITE(self, event):
fp = event.pathname
print 'File created: %s' % fp
def watch(folder):
watch_manager = pyinotify.WatchManager()
watch_manager.add_watch(folder,
pyinotify.EventsCodes.ALL_FLAGS['IN_CLOSE_WRITE'], rec = True, auto_add
=
True)
handler = iNotifyEventHandler()
watch_inotify_inst = pyinotify.Notifier(watch_manager, handler)
return watch_inotify_inst
if __name__ == '__main__':
import sys
if len(sys.argv) != 3:
print 'Usage: %s folder timeout' % sys.argv[0]
exit(1)
folder = sys.argv[1]
timeout = int(sys.argv[2])
notifier = watch(folder)
notifier.process_events()
if notifier.check_events(timeout = timeout):
notifier.read_events()
notifier.process_events()
There comes the problem:
When web clients access the wsgi application, the wsgi forks wait.py as
subprocess and wait it to be finished. But when the subprocess takes too
long to return, the client may go away before the wsgi application
became
ready to response. In this situation, I want the subprocess to be
terminated
as soon as the client is missing. What should I do?
If the wsgi application could catch a signal when the client is gone
away, a
signal could be sent to the subprocess indicating termination. But I
have no
idea which signal to be handled in the wsgi application.
Appreciate for your help.
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