Troubleshooting wsgi file

On an Ubuntu 22.04 host I'm running apache 2.4.52 with python 3.10, using roundup 2.1 to execute a wsgi.py file. After running it (bringing up the URL in a browser) the apache error.log says:

[Mon Jul 11 08:53:50.070418 2022] [wsgi:error] [pid 60096:tid 139981150303808] [remote 10.67.80.23:64993] mod_wsgi (pid=60096): Exception occurred processing WSGI script '/mnt/trackers/it_test/apache/wsgi.py'.
[Mon Jul 11 08:53:50.070531 2022] [wsgi:error] [pid 60096:tid 139981150303808] [remote 10.67.80.23:64993] RuntimeError: response has not been started

It provided no detail about the exception. I looked at the other 2 log files, access.log and other_vhosts_access.log, which indicated activity at that time, but provided no detail regarding the exception. Nothing is written to /tmp/wsgi.log.

I can run the wsgi.py file from the command line and it works fine. It also writes to /tmp/wsgi.log.

>>> import wsgi
>>> wsgi.app
<roundup.cgi.wsgi_handler.RequestDispatcher object at 0x7f76ae028be0>
>>> d = dict(PATH_INFO='/', REQUEST_METHOD='GET')
>>> d['wsgi.input'] = ''
>>> >>> wsgi.application(d, '')
[]

There are differences between my wsgi.py (attached, see below) and Roundup's frontends/wsgi.py, mostly so I could add debugging statements and change sys.path. I made sure the sys.path directories mentioned in my wsgi.py exist. This one is for roundup:

$ ls -dl /usr/local/share/virtualenvs/tracker-env/lib/python3.10/site-packages/roundup
drwxr-xr-x 8 root root 4096 May 26 09:29 /usr/local/share/virtualenvs/tracker-env/lib/python3.10/site-packages/roundup

The other sys.path change is for xapian:

$ ls -dl /usr/lib/python3/dist-packages/xapian/
drwxr-xr-x 3 root root 4096 May 25 13:54 /usr/lib/python3/dist-packages/xapian/

I cut/pasted these paths from the attached wsgi.py file. The wsgi.py ownership and group is roundup, and the mode is 744.

Do you have an idea how I can get more data to determine what the problem is with the erroring wsgi.py file?
----- attachment -----
import sys
# Fix sys.path to contain the VENV path.
# The apt package python3-xapian put the xapian python package in python3.
# Put this path last so it only sees the xapian package.
for new_path in ['/usr/local/share/virtualenvs/tracker-env/lib/python3.10/site-packages',
                 '/usr/lib/python3/dist-packages']:
    if new_path not in sys.path:
        sys.path.append(new_path)

from roundup.cgi.wsgi_handler import RequestDispatcher
tracker_home = '/mnt/trackers/it_test'
app = RequestDispatcher(tracker_home)

debug = True
# Store the environment into a log file.

from datetime import datetime
def debug_log(message):
    with open('/tmp/wsgi.log', 'a') as log:
        now = datetime.now()
        log.write('{now} {message}\n'.format(**locals()))

def application(environ, start_response):
    """
    The main WSGI application.
    """
    if debug:
        debug_log(environ)
        debug_log(sys.path)
    return app(environ, start_response)


Tom Ekberg
Senior Computer Specialist
Department of Laboratory Medicine and Pathology
4th Floor, Pat Steel Building, currently WFH
Home: (253) 561-2509
Email: [email protected]<mailto:[email protected]>

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