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From "Graham Dumpleton (JIRA)" <j...@apache.org>
Subject [jira] Created: (MODPYTHON-13) Builtin functions not callable with mod_python.publisher.
Date Fri, 28 Jan 2005 09:33:17 GMT
Builtin functions not callable with mod_python.publisher.
---------------------------------------------------------

         Key: MODPYTHON-13
         URL: http://issues.apache.org/jira/browse/MODPYTHON-13
     Project: mod_python
        Type: Bug
    Versions: 3.1.3    
    Reporter: Graham Dumpleton


Create a handler file containing:

  _dict = { "a": 1 }
  keys = _dict.keys

Where this file is called "builtin.py", access "builtin.py/keys".

This yields the error:

  Mod_python error: "PythonHandler mod_python.publisher"

  Traceback (most recent call last):

    File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/apache.py",
line 308, in HandlerDispatch
      result = object(req)

    File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/publisher.py",
line 136, in handler
      result = util.apply_fs_data(object, req.form, req=req)

    File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/util.py",
line 356, in apply_fs_data
      if not (fc.co_flags & 0x08):

  UnboundLocalError: local variable 'fc' referenced before assignment

To fix this, mod_python.util needs to be modified in apply_fs_data(). The
modified section of code is:

    fc = None

    expected = [] 
    if hasattr(object, "func_code"):
        # function
        fc = object.func_code
        expected = fc.co_varnames[0:fc.co_argcount]
    elif hasattr(object, 'im_func'):
        # method
        fc = object.im_func.func_code
        expected = fc.co_varnames[1:fc.co_argcount]
    elif type(object) is ClassType:
        # class
        fc = object.__init__.im_func.func_code
        expected = fc.co_varnames[1:fc.co_argcount]
    
    # remove unexpected args unless co_flags & 0x08,
    # meaning function accepts **kw syntax
    if not fc:
        args = {}
    elif not (fc.co_flags & 0x08):
        for name in args.keys():
            if name not in expected:
                del args[name]

Ie., give "fc" a default value, and if it is not able to be set in if clauses, wipe
out "args" altogether.

This change then correctly yields:

  ['a']




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