943fd850bc
Not part of the default build. git-svn-id: svn://10.0.0.236/trunk@218425 18797224-902f-48f8-a5cc-f745e15eee43
171 lines
6.4 KiB
C++
171 lines
6.4 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Python XPCOM language bindings.
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*
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* The Initial Developer of the Original Code is
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* ActiveState Tool Corp.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mark Hammond <mhammond@skippinet.com.au> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// PyXPTStub - the stub for implementing interfaces.
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//
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// This code is part of the XPCOM extensions for Python.
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//
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// Written May 2000 by Mark Hammond.
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//
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// Based heavily on the Python COM support, which is
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// (c) Mark Hammond and Greg Stein.
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//
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// (c) 2000, ActiveState corp.
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#include "PyXPCOM_std.h"
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#include <nsIInterfaceInfoManager.h>
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PyXPCOM_XPTStub::PyXPCOM_XPTStub(PyObject *instance, const nsIID &iid)
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: PyG_Base(instance, iid)
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{
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if (NS_FAILED(InitStub(iid)))
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NS_ERROR("InitStub must not fail!");
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}
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void *PyXPCOM_XPTStub::ThisAsIID(const nsIID &iid)
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{
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// Not quite clear who should get nsISupports - I would
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// expect our PyG_Base, but Java gives it the stub.
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if (iid.Equals(NS_GET_IID(nsISupports)) || iid.Equals(m_iid)) {
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return mXPTCStub;
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}
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// else
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return PyG_Base::ThisAsIID(iid);
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}
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// call this method and return result
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NS_IMETHODIMP
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PyXPCOM_XPTStub::CallMethod(PRUint16 methodIndex,
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const XPTMethodDescriptor* info,
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nsXPTCMiniVariant* params)
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{
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nsresult rc = NS_ERROR_FAILURE;
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NS_PRECONDITION(info, "NULL methodinfo pointer");
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NS_PRECONDITION(params, "NULL variant pointer");
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CEnterLeavePython _celp;
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PyObject *obParams = NULL;
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PyObject *result = NULL;
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PyObject *obThisObject = NULL;
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PyObject *obMI = PyObject_FromXPTMethodDescriptor(info);
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PyXPCOM_GatewayVariantHelper arg_helper(this, methodIndex, info, params);
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if (obMI==NULL)
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goto done;
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// base object is passed raw.
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obThisObject = PyObject_FromNSInterface((nsISupports *)ThisAsIID(m_iid),
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m_iid, PR_FALSE);
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obParams = arg_helper.MakePyArgs();
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if (obParams==NULL)
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goto done;
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result = PyObject_CallMethod(m_pPyObject,
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"_CallMethod_",
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"OiOO",
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obThisObject,
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(int)methodIndex,
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obMI,
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obParams);
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if (result!=NULL) {
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rc = arg_helper.ProcessPythonResult(result);
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// Use an xor to check failure && pyerr, or !failure && !pyerr.
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NS_ABORT_IF_FALSE( ((NS_FAILED(rc)!=0)^(PyErr_Occurred()!=0)) == 0, "We must have failure with a Python error, or success without a Python error.");
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}
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done:
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if (PyErr_Occurred()) {
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// The error handling - fairly involved, but worth it as
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// good error reporting is critical for users to know WTF
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// is going on - especially with TypeErrors etc in their
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// return values (ie, after the Python code has successfully
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// exited, but we encountered errors unpacking the
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// result values for the COM caller - there is literally no
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// way to catch these exceptions from Python code, as their
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// is no Python function on the call-stack)
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// First line of attack in an error is to call-back on the policy.
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// If the callback of the error handler succeeds and returns an
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// integer (for the nsresult), we take no further action.
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// If this callback fails, we log _2_ exceptions - the error handler
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// error, and the original error.
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PRBool bProcessMainError = PR_TRUE; // set to false if our exception handler does its thing!
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PyObject *exc_typ, *exc_val, *exc_tb;
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PyErr_Fetch(&exc_typ, &exc_val, &exc_tb);
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PyErr_NormalizeException( &exc_typ, &exc_val, &exc_tb);
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PyObject *err_result = PyObject_CallMethod(m_pPyObject,
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"_CallMethodException_",
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"OiOO(OOO)",
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obThisObject,
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(int)methodIndex,
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obMI,
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obParams,
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exc_typ ? exc_typ : Py_None, // should never be NULL, but defensive programming...
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exc_val ? exc_val : Py_None, // may well be NULL.
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exc_tb ? exc_tb : Py_None); // may well be NULL.
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if (err_result == NULL) {
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PyXPCOM_LogError("The exception handler _CallMethodException_ failed!\n");
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} else if (err_result == Py_None) {
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// The exception handler has chosen not to do anything with
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// this error, so we still need to print it!
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;
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} else if (PyInt_Check(err_result)) {
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// The exception handler has given us the nresult.
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rc = PyInt_AsLong(err_result);
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bProcessMainError = PR_FALSE;
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} else {
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// The exception handler succeeded, but returned other than
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// int or None.
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PyXPCOM_LogError("The _CallMethodException_ handler returned object of type '%s' - None or an integer expected\n", err_result->ob_type->tp_name);
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}
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Py_XDECREF(err_result);
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PyErr_Restore(exc_typ, exc_val, exc_tb);
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if (bProcessMainError) {
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PyXPCOM_LogError("The function '%s' failed\n", info->name);
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rc = PyXPCOM_SetCOMErrorFromPyException();
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}
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// else everything is already setup,
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// just clear the Python error state.
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PyErr_Clear();
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}
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Py_XDECREF(obMI);
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Py_XDECREF(obParams);
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Py_XDECREF(obThisObject);
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Py_XDECREF(result);
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return rc;
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}
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