// Parses the value of the active python exception
// NOTE SHOULD NOT BE CALLED IF NO EXCEPTION
std::string parse_python_exception(){
PyObject *type_ptr = NULL, *value_ptr = NULL, *traceback_ptr = NULL;
// Fetch the exception info from the Python C API
PyErr_Fetch(&type_ptr, &value_ptr, &traceback_ptr);
// Fallback error
std::string ret("Unfetchable Python error");
// If the fetch got a type pointer, parse the type into the exception string
if(type_ptr != NULL){
py::handle<> h_type(type_ptr);
py::str type_pstr(h_type);
// Extract the string from the boost::python object
py::extract<std::string> e_type_pstr(type_pstr);
// If a valid string extraction is available, use it
// otherwise use fallback
if(e_type_pstr.check())
ret = e_type_pstr();
else
ret = "Unknown exception type";
}
// Do the same for the exception value (the stringification of the exception)
if(value_ptr != NULL){
py::handle<> h_val(value_ptr);
py::str a(h_val);
py::extract<std::string> returned(a);
if(returned.check())
ret += ": " + returned();
else
ret += std::string(": Unparseable Python error: ");
}
// Parse lines from the traceback using the Python traceback module
if(traceback_ptr != NULL){
py::handle<> h_tb(traceback_ptr);
// Load the traceback module and the format_tb function
py::object tb(py::import("traceback"));
py::object fmt_tb(tb.attr("format_tb"));
// Call format_tb to get a list of traceback strings
py::object tb_list(fmt_tb(h_tb));
// Join the traceback strings into a single string
py::object tb_str(py::str("\n").join(tb_list));
// Extract the string, check the extraction, and fallback in necessary
py::extract<std::string> returned(tb_str);
if(returned.check())
ret += ": " + returned();
else
ret += std::string(": Unparseable Python traceback");
}
return ret;
}
std::wstring PyError::get_python_error_description()
{
std::wstring ret = L"Unfetchable Python error";
PyObject *type_ptr = NULL, *value_ptr = NULL, *traceback_ptr = NULL;
PyErr_Fetch(&type_ptr, &value_ptr, &traceback_ptr);
if(type_ptr != NULL)
{
py::handle<> h_type(type_ptr);
py::str type_pstr(h_type);
py::extract<std::wstring> e_type_pstr(type_pstr);
if(e_type_pstr.check())
ret = e_type_pstr();
else
ret = L"Unknown exception type";
}
if(value_ptr != NULL)
{
py::handle<> h_val(value_ptr);
py::str a(h_val);
py::extract<std::wstring> returned(a);
if(returned.check())
ret += L": " + returned();
else
ret += L": Unparseable Python error: ";
}
if(traceback_ptr != NULL)
{
py::handle<> h_tb(traceback_ptr);
py::object tb(py::import("traceback"));
py::object fmt_tb(tb.attr("format_tb"));
py::object tb_list(fmt_tb(h_tb));
py::object tb_str(py::str("\n").join(tb_list));
py::extract<std::wstring> returned(tb_str);
if(returned.check())
ret += L": " + returned();
else
ret += L": Unparseable Python traceback";
}
return ret;
}
