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