python_exec.c

/* $Id: python_exec.c,v 1.1 2009/12/09 09:28:57 root Exp root $
 *
 * Copyright (C) 2009 Sippy Software, Inc., http://www.sippysoft.com
 *
 * This file is part of opensips, a free SIP server.
 *
 * opensips is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * opensips is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
*/

#include <Python.h>

#include "../../mem/mem.h"
#include "../../data_lump.h"
#include "../../parser/parse_param.h"
#include "../../parser/msg_parser.h"
#include "../../dprint.h"
#include "../../action.h"
#include "../../config.h"
#include "../../parser/parse_uri.h"

#include "python_exec.h"
#include "python_mod.h"
#include "python_msgobj.h"
#include "python_support.h"

int
python_exec1(struct sip_msg* _msg, char* method_name, char *foobar)
{
    return python_exec2(_msg, method_name, NULL);
}

int
python_exec2(struct sip_msg *_msg, char *method_name, char *mystr)
{
    PyObject *pFunc, *pArgs, *pValue, *pResult, *pMethodName;
    PyObject *msg;
    PyObject *tmp;
    const char *s;
    int rval;

    PyEval_AcquireLock();
    PyThreadState_Swap(myThreadState);

    pFunc = PyObject_GetAttrString(handler_obj, "call_routing_function");
    if (pFunc == NULL || !PyCallable_Check(pFunc)) {
        LM_ERR("%s not found or is not callable\n", method_name);
        Py_XDECREF(pFunc);
        PyThreadState_Swap(NULL);
        PyEval_ReleaseLock();
        return -1;
    }

    msg = newmsgobject(_msg);
    if (msg == NULL) {
        LM_ERR("can't create MSGtype instance\n");
        Py_DECREF(pFunc);
        PyThreadState_Swap(NULL);
        PyEval_ReleaseLock();
        return -1;
    }

    pArgs = PyTuple_New(mystr == NULL ? 2 : 3);
    if (pArgs == NULL) {
        LM_ERR("PyTuple_New() has failed\n");
        msg_invalidate(msg);
        Py_DECREF(msg);
        Py_DECREF(pFunc);
        PyThreadState_Swap(NULL);
        PyEval_ReleaseLock();
        return -1;
    }

    pMethodName = Py_BuildValue("s", method_name);
    PyTuple_SetItem(pArgs, 0, pMethodName);
    PyTuple_SetItem(pArgs, 1, msg);
    /* Tuple steals msg */

    if (mystr != NULL) {
        pValue = PyString_FromString(mystr);
        if (pValue == NULL) {
            LM_ERR("PyString_FromString(%s) has failed\n", mystr);
            msg_invalidate(msg);
            Py_DECREF(pArgs);
            Py_DECREF(pFunc);
            PyThreadState_Swap(NULL);
            PyEval_ReleaseLock();
            return -1;
        }
        PyTuple_SetItem(pArgs, 2, pValue);
        /* Tuple steals pValue */
    }

    pResult = PyObject_CallObject(pFunc, pArgs);
    msg_invalidate(msg);
    Py_DECREF(pArgs);
    Py_DECREF(pFunc);
    if (PyErr_Occurred()) {
        Py_XDECREF(pResult);
        python_handle_exception("python_exec2");
        PyThreadState_Swap(NULL);
        PyEval_ReleaseLock();
        return -1;
    }

    if (pResult == NULL || pResult == Py_None) {
        LM_ERR("PyObject_CallObject() returned NULL\n");
        PyThreadState_Swap(NULL);
        PyEval_ReleaseLock();
        return -1;
    }

    rval = PyInt_AsLong(pResult);
    if (PyErr_Occurred()) {
        tmp = PyObject_Repr(pResult);
        s = PyString_AsString(tmp);
        LM_ERR("Python routing function return something other than an integer or None: %s", s);
        PyErr_Clear();
        rval = -1;
    }

    Py_DECREF(pResult);
    PyThreadState_Swap(NULL);
    PyEval_ReleaseLock();
    return rval;
}