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/*
* Copyright (c) 2022 Balazs Scheidler <bazsi77@gmail.com>
*
* This library 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.
*
* This library 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
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "python-module.h"
#include "python-helpers.h"
#include "python-types.h"
#include "cfg-block-generator.h"
#include "cfg-lexer.h"
#include "cfg.h"
typedef struct _PythonConfigGenerator
{
CfgBlockGenerator super;
PyObject *py_generator_function;
} PythonConfigGenerator;
static gboolean
python_config_generator_generate(CfgBlockGenerator *s,
GlobalConfig *cfg,
gpointer a,
GString *result,
const gchar *reference)
{
PythonConfigGenerator *self = (PythonConfigGenerator *) s;
PyGILState_STATE gstate;
CfgArgs *args = (CfgArgs *) a;
gboolean success = FALSE;
gstate = PyGILState_Ensure();
PyObject *py_args = _py_construct_cfg_args((CfgArgs *) args);
PyObject *res = _py_invoke_function(self->py_generator_function, py_args, NULL, reference);
Py_XDECREF(py_args);
if (res)
{
const gchar *generated_config;
if (py_bytes_or_string_to_string(res, &generated_config))
{
g_string_assign(result, generated_config);
success = TRUE;
}
else
{
msg_error("python-confgen: generator function returned a non-string value",
evt_tag_str("reference", reference));
}
Py_DECREF(res);
}
PyGILState_Release(gstate);
return success;
}
static void
python_config_generator_free(CfgBlockGenerator *s)
{
PythonConfigGenerator *self = (PythonConfigGenerator *) s;
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
Py_XDECREF(self->py_generator_function);
PyGILState_Release(gstate);
cfg_block_generator_free_instance(s);
}
CfgBlockGenerator *
python_config_generator_new(gint context, const gchar *name, PyObject *py_generator_function)
{
PythonConfigGenerator *self = g_new0(PythonConfigGenerator, 1);
cfg_block_generator_init_instance(&self->super, context, name);
self->super.generate = python_config_generator_generate;
self->super.free_fn = python_config_generator_free;
self->py_generator_function = py_generator_function;
return &self->super;
}
void
python_confgen_register(gint context, const gchar *name, PyObject *py_generator_function)
{
CfgBlockGenerator *confgen;
confgen = python_config_generator_new(context, name, py_generator_function);
cfg_lexer_register_generator_plugin(&configuration->plugin_context, confgen);
}
static PyObject *
py_register_config_generator(PyObject *self, PyObject *args, PyObject *kwargs)
{
PyObject *generator_function;
gchar *context_name;
gchar *name;
static const gchar *kwlist[] = { "context", "name", "config_generator", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "ssO", (gchar **) kwlist,
&context_name, &name, &generator_function))
return NULL;
gint context_value = cfg_lexer_lookup_context_type_by_name(context_name);
if (!context_value)
{
PyErr_Format(PyExc_ValueError, "unknown context value %s", context_name);
return NULL;
}
Py_XINCREF(generator_function);
python_confgen_register(context_value, name, generator_function);
Py_RETURN_NONE;
}
static PyMethodDef py_confgen_methods[] =
{
{ "register_config_generator", (PyCFunction) py_register_config_generator, METH_VARARGS | METH_KEYWORDS, "Register a config generator plugin" },
{ NULL }
};
void
py_init_confgen(void)
{
PyObject *module = PyImport_AddModule("_syslogng");
PyModule_AddFunctions(module, py_confgen_methods);
}
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