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/*
* peas-python-internal.c
* This file is part of libpeas
*
* Copyright (C) 2014-2015 - Garrett Regier
*
* libpeas is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* libpeas 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include "peas-python-internal.h"
#include <gio/gio.h>
static PyObject *internal_module = NULL;
static PyObject *internal_hooks = NULL;
static PyObject *FailedError = NULL;
static PyObject *
failed_fn (PyObject *self,
PyObject *args)
{
const gchar *msg;
gchar *clean_msg;
if (!PyArg_ParseTuple (args, "s:Hooks.failed", &msg))
return NULL;
/* Python tracebacks have a trailing newline */
clean_msg = g_strchomp (g_strdup (msg));
g_warning ("%s", clean_msg);
/* peas_python_internal_call() knows to check for this exception */
PyErr_SetObject (FailedError, NULL);
g_free (clean_msg);
return NULL;
}
static PyMethodDef failed_method_def = {
"failed", (PyCFunction) failed_fn, METH_VARARGS | METH_STATIC,
"Prints warning and raises an Exception"
};
gboolean
peas_python_internal_setup (gboolean already_initialized)
{
const gchar *prgname;
GBytes *internal_python = NULL;
PyObject *builtins_module, *globals, *result;
PyObject *code = NULL, *failed_method = NULL;
gboolean success = FALSE;
#define goto_error_if_failed(cond) \
G_STMT_START { \
if (G_UNLIKELY (!(cond))) \
{ \
g_warn_if_fail (cond); \
goto error; \
} \
} G_STMT_END
prgname = g_get_prgname ();
prgname = prgname == NULL ? "" : prgname;
builtins_module = PyImport_ImportModule ("builtins");
goto_error_if_failed (builtins_module != NULL);
/* We don't use the byte-compiled Python source
* because glib-compile-resources cannot output
* depends for generated files.
*
* https://bugzilla.gnome.org/show_bug.cgi?id=673101
*/
internal_python = g_resources_lookup_data ("/org/gnome/libpeas/loaders/"
"python/"
"internal.py",
G_RESOURCE_LOOKUP_FLAGS_NONE,
NULL);
goto_error_if_failed (internal_python != NULL);
/* Compile it manually so the filename is available */
code = Py_CompileString (g_bytes_get_data (internal_python, NULL),
"peas-python-internal.py",
Py_file_input);
goto_error_if_failed (code != NULL);
internal_module = PyModule_New ("libpeas-internal");
goto_error_if_failed (internal_module != NULL);
goto_error_if_failed (PyModule_AddStringConstant (internal_module, "__file__",
"peas-python-internal.py") == 0);
goto_error_if_failed (PyModule_AddObject (internal_module, "__builtins__",
builtins_module) == 0);
goto_error_if_failed (PyModule_AddObject (internal_module,
"ALREADY_INITIALIZED",
already_initialized ?
Py_True : Py_False) == 0);
goto_error_if_failed (PyModule_AddStringConstant (internal_module,
"PRGNAME",
prgname) == 0);
goto_error_if_failed (PyModule_AddStringMacro (internal_module,
GETTEXT_PACKAGE) == 0);
#ifndef G_OS_WIN32
goto_error_if_failed (PyModule_AddStringMacro (internal_module,
PEAS_LOCALEDIR) == 0);
#endif
globals = PyModule_GetDict (internal_module);
result = PyEval_EvalCode ((gpointer) code, globals, globals);
Py_XDECREF (result);
if (PyErr_Occurred ())
{
g_warning ("Failed to run internal Python code");
goto error;
}
internal_hooks = PyDict_GetItemString (globals, "hooks");
goto_error_if_failed (internal_hooks != NULL);
FailedError = PyDict_GetItemString (globals, "FailedError");
goto_error_if_failed (FailedError != NULL);
failed_method = PyCFunction_NewEx (&failed_method_def,
NULL, internal_module);
goto_error_if_failed (failed_method != NULL);
goto_error_if_failed (PyObject_SetAttrString (internal_hooks, "failed",
failed_method) == 0);
success = TRUE;
#undef goto_error_if_failed
error:
Py_XDECREF (failed_method);
Py_XDECREF (code);
g_clear_pointer (&internal_python, g_bytes_unref);
if (!success)
{
FailedError = NULL;
internal_hooks = NULL;
if (internal_module != NULL)
{
PyDict_Clear (PyModule_GetDict (internal_module));
Py_DECREF (internal_module);
}
}
return success;
}
void
peas_python_internal_shutdown (void)
{
peas_python_internal_call ("exit", NULL, NULL);
FailedError = NULL;
internal_hooks = NULL;
PyDict_Clear (PyModule_GetDict (internal_module));
Py_DECREF (internal_module);
}
PyObject *
peas_python_internal_call (const gchar *name,
PyTypeObject *return_type,
const gchar *format,
...)
{
PyObject *args;
PyObject *result = NULL;
va_list var_args;
/* The PyTypeObject for Py_None is not exposed directly */
if (return_type == NULL)
return_type = Py_None->ob_type;
va_start (var_args, format);
args = Py_VaBuildValue (format == NULL ? "()" : format, var_args);
va_end (var_args);
if (args != NULL)
{
result = PyObject_CallMethod (internal_hooks, "call", "(sOO)",
name, args, return_type);
Py_DECREF (args);
}
if (PyErr_Occurred ())
{
/* Raised by failed_fn() to prevent printing the exception */
if (PyErr_ExceptionMatches (FailedError))
{
PyErr_Clear ();
}
else
{
g_warning ("Failed to run internal Python hook 'call'");
PyErr_Print ();
}
return NULL;
}
if (result == Py_None)
Py_CLEAR (result);
return result;
}
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