Allow access to request_rec/server_rec/conn_rec/filter_rec as Python CObject.

         Key: MODPYTHON-170
     Project: mod_python
        Type: New Feature

  Components: core  
    Reporter: Graham Dumpleton
 Assigned to: Graham Dumpleton 

At the moment, if mod_python doesn't expose a feature of Apache that you may 
want to use, you are stuffed and either have to convince mod_python maintainers 
to add it, patch your mod_python or create a Python loadable module that builds 
against both mod_python headers and Apache headers.

In the latter, it needs access to mod_python headers so as to be able to look 
inside the mod_python requestobject to get at the request_rec Apache structure. 
In practice, the only thing from the mod_python requestobject that such a 
extension module is going to want, is the request_rec structure, thus it is 
probably simpler and makes building such an extension easier, if the mod_python 
requestobject provided a "request_rec" attribute which was a Python CObject 
wrapper which wrapped the C request_rec pointer. Similarly, access to 
server_rec/conn_rec/filter_rec could also be provided.

For example, you might have a C extension function like:

typedef int (*ssl_is_https_t)(conn_rec*);

static PyObject* is_https(PyObject* module, PyObject* args)
  PyObject* req_object = 0;
  request_rec* req;
  ssl_is_https_t ssl_is_https = 0;
  int result = 0;

  if (!PyArg_ParseTuple(args,"O",&req_object))
    return 0;

  if (! PyCObject_Check(req_object))
    PyErr_SetString(PyExc_TypeError,"not a CObject");

  req = PyCObject_AsVoidPtr(req_object);

  ssl_is_https = (ssl_is_https_t)apr_dynamic_fn_retrieve("ssl_is_https");

  if (ssl_is_https == 0)
    return Py_BuildValue("i",0);

  result = ssl_is_https(req->connection);

  return Py_BuildValue("i",result);

The call to this form Python code would be:

import myextension

def handler(req):
    if myextension.is_https(req.request_rec):

Note that something like this was posted some time back:

but the problem with it was that it needed the mod_python header files when 
compiling. Using the Python CObject avoids that. Any Python distutils 
file still needs to know where the Apache header files etc are, but it can use 
apxs to get that.

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