Explicitly don't allow Pdb support to work if not ONE_PROCESS mode.
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Key: MODPYTHON-90
URL: http://issues.apache.org/jira/browse/MODPYTHON-90
Project: mod_python
Type: Improvement
Components: core
Versions: 3.3
Reporter: Graham Dumpleton
Priority: Minor
mod_python provides the PythonEnablePdb option for enabling of the Python
debugger. For it to work properly though, it is necessary to start httpd from
the command line with the -DONE_PROCESS option. If one doesn't do this though
and enables PythonEnablePdb when Apache is running normally, any request to a
URL for which the debugger is enabled will yield a 500 error. The details of
the 500 error will be:
Mod_python error: "PythonHandler mptest"
Traceback (most recent call last):
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/apache.py",
line 313, in HandlerDispatch
assert (type(result) == type(int())), \
AssertionError: Handler 'mptest' returned invalid return code.
This error message isn't particularly helpful in understanding that the problem
is that the debugger can't be run in this mode.
To avoid this problem at the moment, all that can be done is for the user to
know that their Apache configuration should actually say:
<IfDefine ONE_PROCESS>
PythonEnablePdb On
</IfDefine>
This would mean they could leave the Apache configuration set the one way and
not have to worry.
What could instead be done in mod_python though is simply to ignore the
PythonEnablePdb option and that it is set if Apache hasn't been run in
ONE_PROCESS mode. Thus, presuming that MODPYTHON-89 has been implemented, the
mod_python code in mod_python.apache in the number of places where it occurs,
could say:
# call the object
if exists_config_define("ONE_PROCESS") and
config.has_key("PythonEnablePdb"):
result = pdb.runcall(object, conn)
else:
result = object(conn)
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