I am using apache(2.4.6) with mod_wsgi(4.6.5) in daemon mode. I am
currently working on a project which needs to preload the WSGI application.
This is the configuration i was using before:
<VirtualHost *:8080>
DocumentRoot /path/to/repro/wwwroot
WSGIDaemonProcess repro processes=1 threads=1 display-name=repro
maximum-requests=0
WSGIProcessGroup repro
WSGIScriptAlias /repro /path/to/repro.py process-group=repro
WSGIApplicationGroup %{GLOBAL}
</VirtualHost>
This is the repro.py file:
import os
import web
import sys
import threading
urls = ( '/', 'index' )
class index:
def GET(self):
print(threading.main_thread())
print(threading.current_thread())
print(threading.enumerate())
return "Hello, world!"
application = web.application(urls, globals()).wsgifunc()
According to the following two resources:
- enable to initialize other python module before first request (Django
+ mod_wsgi + apache)
<https://stackoverflow.com/questions/43941192/enable-to-initialize-other-python-module-before-first-request-django-mod-wsgi>
-
https://modwsgi.readthedocs.io/en/master/configuration-directives/WSGIScriptAlias.html
I changed the configuration to this:
<VirtualHost *:8080>
DocumentRoot /path/to/repro/wwwroot
WSGIDaemonProcess repro processes=1 threads=1 display-name=repro
maximum-requests=0
WSGIScriptAlias /repro /path/to/repro.py process-group=repro
application-group=%{GLOBAL}
WSGIProcessGroup repro
WSGIApplicationGroup %{GLOBAL}
</VirtualHost>
i.e specified both *application-group* and *process-group* directive. This
solved the pre-loading problem for us.
But, the difference here is that in the first case all the requests were
being handled by the main thread but after the configuration change, the
requests are now being handled in the non-main thread. We have a bunch of
code that requires things to be run on the main thread and were running
previously but after the change, it is causing them to fail.
I tried reordering WSGIApplicationGroup and WSGIProcess group directive but
that didn't work. The only thing that worked was the removal of
application-group from WSGIScriptAlias but that then would not preload the
wsgi app. Could you please suggest to me what other things I could try?
Thank you for your time!
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