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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include "cleanup.h"
#include "plugin.h"
/* This is the fallback in case we cannot get the full traceback. */
static void
print_python_error (const char *callback, PyObject *error)
{
PyObject *error_str;
CLEANUP_FREE char *error_cstr = NULL;
error_str = PyObject_Str (error);
error_cstr = python_to_string (error_str);
nbdkit_error ("%s: %s: error: %s",
script, callback,
error_cstr ? error_cstr : "<unknown>");
Py_DECREF (error_str);
}
/* Convert the Python traceback to a string and call nbdkit_error.
* https://stackoverflow.com/a/15907460/7126113
*/
static int
print_python_traceback (const char *callback,
PyObject *type, PyObject *error, PyObject *traceback)
{
PyObject *module_name, *traceback_module, *format_exception_fn, *rv,
*traceback_str;
CLEANUP_FREE char *traceback_cstr = NULL;
module_name = PyUnicode_FromString ("traceback");
traceback_module = PyImport_Import (module_name);
Py_DECREF (module_name);
/* couldn't 'import traceback' */
if (traceback_module == NULL)
return -1;
format_exception_fn = PyObject_GetAttrString (traceback_module,
"format_exception");
if (format_exception_fn == NULL)
return -1;
if (!PyCallable_Check (format_exception_fn))
return -1;
rv = PyObject_CallFunctionObjArgs (format_exception_fn,
type, error, traceback, NULL);
if (rv == NULL)
return -1;
traceback_str = PyUnicode_Join (NULL, rv);
Py_DECREF (rv);
traceback_cstr = python_to_string (traceback_str);
if (traceback_cstr == NULL) {
Py_DECREF (traceback_str);
return -1;
}
nbdkit_error ("%s: %s: error: %s",
script, callback,
traceback_cstr);
Py_DECREF (traceback_str);
/* This means we succeeded in calling nbdkit_error. */
return 0;
}
int
check_python_failure (const char *callback)
{
if (PyErr_Occurred ()) {
PyObject *type, *error, *traceback;
PyErr_Fetch (&type, &error, &traceback);
PyErr_NormalizeException (&type, &error, &traceback);
/* Try to print the full traceback. */
if (print_python_traceback (callback, type, error, traceback) == -1) {
/* Couldn't do that, so fall back to converting the Python error
* to a string.
*/
print_python_error (callback, error);
}
/* In all cases this returns -1 to indicate that a Python error
* occurred.
*/
return -1;
}
return 0;
}
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