[mirror_frr.git] / lib / command_py.c

/*
 * clippy (CLI preparator in python) wrapper for FRR command_graph
 * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* note: this wrapper is intended to be used as build-time helper.  while
 * it should be generally correct and proper, there may be the occasional
 * memory leak or SEGV for things that haven't been well-tested.
 */

#include <Python.h>
#include "structmember.h"
#include <string.h>
#include <stdlib.h>

#include "command_graph.h"
#include "clippy.h"

struct wrap_graph;
static PyObject *graph_to_pyobj(struct wrap_graph *graph,
				struct graph_node *gn);

/*
 * nodes are wrapped as follows:
 *  - instances can only be acquired from a graph
 *  - the same node will return the same wrapper object (they're buffered
 *    through "idx")
 *  - a reference is held onto the graph
 *  - fields are copied for easy access with PyMemberDef
 */
struct wrap_graph_node {
	PyObject_HEAD

		bool allowrepeat;
	const char *type;

	bool deprecated;
	bool hidden;
	const char *text;
	const char *desc;
	const char *varname;
	long long min, max;

	struct graph_node *node;
	struct wrap_graph *wgraph;
	size_t idx;
};

/*
 * graphs are wrapped as follows:
 *  - they can only be created by parsing a definition string
 *  - there's a table here for the wrapped nodes (nodewrappers), indexed
 *    by "idx" (corresponds to node's position in graph's table of nodes)
 *  - graphs do NOT hold references to nodes (would be circular)
 */
struct wrap_graph {
	PyObject_HEAD

		char *definition;
	struct graph *graph;
	struct wrap_graph_node **nodewrappers;
};

static PyObject *refuse_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	PyErr_SetString(PyExc_ValueError,
			"cannot create instances of this type");
	return NULL;
}

#define member(name, type)                                                     \
	{                                                                      \
		(char *)#name, type, offsetof(struct wrap_graph_node, name),   \
			READONLY, (char *)#name " (" #type ")"                 \
	}
static PyMemberDef members_graph_node[] = {
	member(allowrepeat, T_BOOL), member(type, T_STRING),
	member(deprecated, T_BOOL),  member(hidden, T_BOOL),
	member(text, T_STRING),      member(desc, T_STRING),
	member(min, T_LONGLONG),     member(max, T_LONGLONG),
	member(varname, T_STRING),   {},
};
#undef member

/*
 * node.next() -- returns list of all "next" nodes.
 * this will include circles if the graph has them.
 */
static PyObject *graph_node_next(PyObject *self, PyObject *args)
{
	struct wrap_graph_node *wrap = (struct wrap_graph_node *)self;
	PyObject *pylist;

	if (wrap->node->data
	    && ((struct cmd_token *)wrap->node->data)->type == END_TKN)
		return PyList_New(0);
	pylist = PyList_New(vector_active(wrap->node->to));
	for (size_t i = 0; i < vector_active(wrap->node->to); i++) {
		struct graph_node *gn = vector_slot(wrap->node->to, i);
		PyList_SetItem(pylist, i, graph_to_pyobj(wrap->wgraph, gn));
	}
	return pylist;
};

/*
 * node.join() -- return FORK's JOIN node or None
 */
static PyObject *graph_node_join(PyObject *self, PyObject *args)
{
	struct wrap_graph_node *wrap = (struct wrap_graph_node *)self;

	if (!wrap->node->data
	    || ((struct cmd_token *)wrap->node->data)->type == END_TKN)
		Py_RETURN_NONE;

	struct cmd_token *tok = wrap->node->data;
	if (tok->type != FORK_TKN)
		Py_RETURN_NONE;

	return graph_to_pyobj(wrap->wgraph, tok->forkjoin);
};

static PyMethodDef methods_graph_node[] = {
	{"next", graph_node_next, METH_NOARGS, "outbound graph edge list"},
	{"join", graph_node_join, METH_NOARGS, "outbound join node"},
	{}};

static void graph_node_wrap_free(void *arg)
{
	struct wrap_graph_node *wrap = arg;
	wrap->wgraph->nodewrappers[wrap->idx] = NULL;
	Py_DECREF(wrap->wgraph);
}

static PyTypeObject typeobj_graph_node = {
	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.GraphNode",
	.tp_basicsize = sizeof(struct wrap_graph_node),
	.tp_flags = Py_TPFLAGS_DEFAULT,
	.tp_doc = "struct graph_node *",
	.tp_new = refuse_new,
	.tp_free = graph_node_wrap_free,
	.tp_members = members_graph_node,
	.tp_methods = methods_graph_node,
};

static PyObject *graph_to_pyobj(struct wrap_graph *wgraph,
				struct graph_node *gn)
{
	struct wrap_graph_node *wrap;
	size_t i;

	for (i = 0; i < vector_active(wgraph->graph->nodes); i++)
		if (vector_slot(wgraph->graph->nodes, i) == gn)
			break;
	if (i == vector_active(wgraph->graph->nodes)) {
		PyErr_SetString(PyExc_ValueError, "cannot find node in graph");
		return NULL;
	}
	if (wgraph->nodewrappers[i]) {
		PyObject *obj = (PyObject *)wgraph->nodewrappers[i];
		Py_INCREF(obj);
		return obj;
	}

	wrap = (struct wrap_graph_node *)typeobj_graph_node.tp_alloc(
		&typeobj_graph_node, 0);
	if (!wrap)
		return NULL;
	wgraph->nodewrappers[i] = wrap;
	Py_INCREF(wgraph);

	wrap->idx = i;
	wrap->wgraph = wgraph;
	wrap->node = gn;
	wrap->type = "NULL";
	wrap->allowrepeat = false;
	if (gn->data) {
		struct cmd_token *tok = gn->data;
		switch (tok->type) {
#define item(x) case x: wrap->type = #x; break;
			item(WORD_TKN)		      // words
				item(VARIABLE_TKN)    // almost anything
				item(RANGE_TKN)       // integer range
				item(IPV4_TKN)	// IPV4 addresses
				item(IPV4_PREFIX_TKN) // IPV4 network prefixes
				item(IPV6_TKN)	// IPV6 prefixes
				item(IPV6_PREFIX_TKN) // IPV6 network prefixes

				/* plumbing types */
				item(FORK_TKN) item(JOIN_TKN) item(START_TKN)
					item(END_TKN) default
				: wrap->type = "???";
		}

		wrap->deprecated = (tok->attr == CMD_ATTR_DEPRECATED);
		wrap->hidden = (tok->attr == CMD_ATTR_HIDDEN);
		wrap->text = tok->text;
		wrap->desc = tok->desc;
		wrap->varname = tok->varname;
		wrap->min = tok->min;
		wrap->max = tok->max;
		wrap->allowrepeat = tok->allowrepeat;
	}

	return (PyObject *)wrap;
}

#define member(name, type)                                                     \
	{                                                                      \
		(char *)#name, type, offsetof(struct wrap_graph, name),        \
			READONLY, (char *)#name " (" #type ")"                 \
	}
static PyMemberDef members_graph[] = {
	member(definition, T_STRING),
	{},
};
#undef member

/* graph.first() - root node */
static PyObject *graph_first(PyObject *self, PyObject *args)
{
	struct wrap_graph *gwrap = (struct wrap_graph *)self;
	struct graph_node *gn = vector_slot(gwrap->graph->nodes, 0);
	return graph_to_pyobj(gwrap, gn);
};

static PyMethodDef methods_graph[] = {
	{"first", graph_first, METH_NOARGS, "first graph node"},
	{}};

static PyObject *graph_parse(PyTypeObject *type, PyObject *args,
			     PyObject *kwds);

static void graph_wrap_free(void *arg)
{
	struct wrap_graph *wgraph = arg;
	free(wgraph->nodewrappers);
	free(wgraph->definition);
}

static PyTypeObject typeobj_graph = {
	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.Graph",
	.tp_basicsize = sizeof(struct wrap_graph),
	.tp_flags = Py_TPFLAGS_DEFAULT,
	.tp_doc = "struct graph *",
	.tp_new = graph_parse,
	.tp_free = graph_wrap_free,
	.tp_members = members_graph,
	.tp_methods = methods_graph,
};

/* top call / entrypoint for python code */
static PyObject *graph_parse(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	const char *def, *doc = NULL;
	struct wrap_graph *gwrap;
	static const char *kwnames[] = {"cmddef", "doc", NULL};

	gwrap = (struct wrap_graph *)typeobj_graph.tp_alloc(&typeobj_graph, 0);
	if (!gwrap)
		return NULL;

	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|s", (char **)kwnames,
					 &def, &doc))
		return NULL;

	struct graph *graph = graph_new();
	struct cmd_token *token = cmd_token_new(START_TKN, 0, NULL, NULL);
	graph_new_node(graph, token, (void (*)(void *)) & cmd_token_del);

	struct cmd_element cmd = {.string = def, .doc = doc};
	cmd_graph_parse(graph, &cmd);
	cmd_graph_names(graph);

	gwrap->graph = graph;
	gwrap->definition = strdup(def);
	gwrap->nodewrappers = calloc(vector_active(graph->nodes),
				     sizeof(gwrap->nodewrappers[0]));
	return (PyObject *)gwrap;
}

static PyMethodDef clippy_methods[] = {
	{"parse", clippy_parse, METH_VARARGS, "Parse a C file"},
	{NULL, NULL, 0, NULL}};

#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef pymoddef_clippy = {
	PyModuleDef_HEAD_INIT,
	"_clippy",
	NULL, /* docstring */
	-1,
	clippy_methods,
};
#define modcreate() PyModule_Create(&pymoddef_clippy)
#define initret(val) return val;
#else
#define modcreate() Py_InitModule("_clippy", clippy_methods)
#define initret(val)                                                           \
	do {                                                                   \
		if (!val)                                                      \
			Py_FatalError("initialization failure");               \
		return;                                                        \
	} while (0)
#endif

PyMODINIT_FUNC command_py_init(void)
{
	PyObject *pymod;

	if (PyType_Ready(&typeobj_graph_node) < 0)
		initret(NULL);
	if (PyType_Ready(&typeobj_graph) < 0)
		initret(NULL);

	pymod = modcreate();
	if (!pymod)
		initret(NULL);

	Py_INCREF(&typeobj_graph_node);
	PyModule_AddObject(pymod, "GraphNode", (PyObject *)&typeobj_graph_node);
	Py_INCREF(&typeobj_graph);
	PyModule_AddObject(pymod, "Graph", (PyObject *)&typeobj_graph);
	initret(pymod);
}
Commit	Line	Data
29ad6f68 DL	1	/*
	2	* clippy (CLI preparator in python) wrapper for FRR command_graph
	3	* Copyright (C) 2016-2017 David Lamparter for NetDEF, Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the Free
	7	* Software Foundation; either version 2 of the License, or (at your option)
	8	* any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; see the file COPYING; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19
	20	/* note: this wrapper is intended to be used as build-time helper. while
	21	* it should be generally correct and proper, there may be the occasional
	22	* memory leak or SEGV for things that haven't been well-tested.
	23	*/
	24
	25	#include <Python.h>
	26	#include "structmember.h"
	27	#include <string.h>
	28	#include <stdlib.h>
	29
	30	#include "command_graph.h"
	31	#include "clippy.h"
	32
	33	struct wrap_graph;
d62a17ae	34	static PyObject graph_to_pyobj(struct wrap_graph graph,
d62a17ae	35	struct graph_node *gn);
29ad6f68 DL	36
	37	/*
	38	* nodes are wrapped as follows:
	39	* - instances can only be acquired from a graph
	40	* - the same node will return the same wrapper object (they're buffered
	41	* through "idx")
	42	* - a reference is held onto the graph
	43	* - fields are copied for easy access with PyMemberDef
	44	*/
	45	struct wrap_graph_node {
	46	PyObject_HEAD
	47
d62a17ae	48	bool allowrepeat;
29ad6f68 DL	49	const char *type;
	50
	51	bool deprecated;
	52	bool hidden;
	53	const char *text;
	54	const char *desc;
	55	const char *varname;
	56	long long min, max;
	57
	58	struct graph_node *node;
	59	struct wrap_graph *wgraph;
	60	size_t idx;
	61	};
	62
	63	/*
	64	* graphs are wrapped as follows:
	65	* - they can only be created by parsing a definition string
	66	* - there's a table here for the wrapped nodes (nodewrappers), indexed
	67	* by "idx" (corresponds to node's position in graph's table of nodes)
	68	* - graphs do NOT hold references to nodes (would be circular)
	69	*/
	70	struct wrap_graph {
	71	PyObject_HEAD
	72
d62a17ae	73	char *definition;
29ad6f68 DL	74	struct graph *graph;
	75	struct wrap_graph_node **nodewrappers;
	76	};
	77
	78	static PyObject refuse_new(PyTypeObject type, PyObject args, PyObject kwds)
	79	{
d62a17ae	80	PyErr_SetString(PyExc_ValueError,
d62a17ae	81	"cannot create instances of this type");
29ad6f68 DL	82	return NULL;
	83	}
	84
d62a17ae	85	#define member(name, type) \
	86	{ \
	87	(char *)#name, type, offsetof(struct wrap_graph_node, name), \
	88	READONLY, (char *)#name " (" #type ")" \
	89	}
29ad6f68	90	static PyMemberDef members_graph_node[] = {
d62a17ae	91	member(allowrepeat, T_BOOL), member(type, T_STRING),
	92	member(deprecated, T_BOOL), member(hidden, T_BOOL),
	93	member(text, T_STRING), member(desc, T_STRING),
	94	member(min, T_LONGLONG), member(max, T_LONGLONG),
	95	member(varname, T_STRING), {},
29ad6f68 DL	96	};
	97	#undef member
	98
	99	/*
	100	* node.next() -- returns list of all "next" nodes.
	101	* this will include circles if the graph has them.
	102	*/
	103	static PyObject graph_node_next(PyObject self, PyObject *args)
	104	{
	105	struct wrap_graph_node wrap = (struct wrap_graph_node )self;
	106	PyObject *pylist;
	107
	108	if (wrap->node->data
d62a17ae	109	&& ((struct cmd_token *)wrap->node->data)->type == END_TKN)
29ad6f68 DL	110	return PyList_New(0);
	111	pylist = PyList_New(vector_active(wrap->node->to));
	112	for (size_t i = 0; i < vector_active(wrap->node->to); i++) {
	113	struct graph_node *gn = vector_slot(wrap->node->to, i);
	114	PyList_SetItem(pylist, i, graph_to_pyobj(wrap->wgraph, gn));
	115	}
	116	return pylist;
	117	};
	118
	119	/*
	120	* node.join() -- return FORK's JOIN node or None
	121	*/
	122	static PyObject graph_node_join(PyObject self, PyObject *args)
	123	{
	124	struct wrap_graph_node wrap = (struct wrap_graph_node )self;
	125
	126	if (!wrap->node->data
d62a17ae	127	\|\| ((struct cmd_token *)wrap->node->data)->type == END_TKN)
29ad6f68 DL	128	Py_RETURN_NONE;
	129
	130	struct cmd_token *tok = wrap->node->data;
	131	if (tok->type != FORK_TKN)
	132	Py_RETURN_NONE;
	133
	134	return graph_to_pyobj(wrap->wgraph, tok->forkjoin);
	135	};
	136
	137	static PyMethodDef methods_graph_node[] = {
	138	{"next", graph_node_next, METH_NOARGS, "outbound graph edge list"},
	139	{"join", graph_node_join, METH_NOARGS, "outbound join node"},
d62a17ae	140	{}};
29ad6f68 DL	141
	142	static void graph_node_wrap_free(void *arg)
	143	{
	144	struct wrap_graph_node *wrap = arg;
	145	wrap->wgraph->nodewrappers[wrap->idx] = NULL;
	146	Py_DECREF(wrap->wgraph);
	147	}
	148
	149	static PyTypeObject typeobj_graph_node = {
d62a17ae	150	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.GraphNode",
	151	.tp_basicsize = sizeof(struct wrap_graph_node),
	152	.tp_flags = Py_TPFLAGS_DEFAULT,
	153	.tp_doc = "struct graph_node *",
	154	.tp_new = refuse_new,
	155	.tp_free = graph_node_wrap_free,
	156	.tp_members = members_graph_node,
	157	.tp_methods = methods_graph_node,
29ad6f68 DL	158	};
29ad6f68 DL	159
d62a17ae	160	static PyObject graph_to_pyobj(struct wrap_graph wgraph,
d62a17ae	161	struct graph_node *gn)
29ad6f68 DL	162	{
	163	struct wrap_graph_node *wrap;
	164	size_t i;
	165
	166	for (i = 0; i < vector_active(wgraph->graph->nodes); i++)
	167	if (vector_slot(wgraph->graph->nodes, i) == gn)
	168	break;
	169	if (i == vector_active(wgraph->graph->nodes)) {
	170	PyErr_SetString(PyExc_ValueError, "cannot find node in graph");
	171	return NULL;
	172	}
	173	if (wgraph->nodewrappers[i]) {
	174	PyObject obj = (PyObject )wgraph->nodewrappers[i];
	175	Py_INCREF(obj);
	176	return obj;
	177	}
	178
d62a17ae	179	wrap = (struct wrap_graph_node *)typeobj_graph_node.tp_alloc(
d62a17ae	180	&typeobj_graph_node, 0);
29ad6f68 DL	181	if (!wrap)
	182	return NULL;
	183	wgraph->nodewrappers[i] = wrap;
	184	Py_INCREF(wgraph);
	185
	186	wrap->idx = i;
	187	wrap->wgraph = wgraph;
	188	wrap->node = gn;
	189	wrap->type = "NULL";
	190	wrap->allowrepeat = false;
	191	if (gn->data) {
	192	struct cmd_token *tok = gn->data;
	193	switch (tok->type) {
	194	#define item(x) case x: wrap->type = #x; break;
d62a17ae	195	item(WORD_TKN) // words
	196	item(VARIABLE_TKN) // almost anything
	197	item(RANGE_TKN) // integer range
	198	item(IPV4_TKN) // IPV4 addresses
	199	item(IPV4_PREFIX_TKN) // IPV4 network prefixes
	200	item(IPV6_TKN) // IPV6 prefixes
	201	item(IPV6_PREFIX_TKN) // IPV6 network prefixes
	202
	203	/* plumbing types */
	204	item(FORK_TKN) item(JOIN_TKN) item(START_TKN)
	205	item(END_TKN) default
	206	: wrap->type = "???";
29ad6f68 DL	207	}
	208
	209	wrap->deprecated = (tok->attr == CMD_ATTR_DEPRECATED);
	210	wrap->hidden = (tok->attr == CMD_ATTR_HIDDEN);
	211	wrap->text = tok->text;
	212	wrap->desc = tok->desc;
	213	wrap->varname = tok->varname;
	214	wrap->min = tok->min;
	215	wrap->max = tok->max;
	216	wrap->allowrepeat = tok->allowrepeat;
	217	}
	218
	219	return (PyObject *)wrap;
	220	}
	221
d62a17ae	222	#define member(name, type) \
	223	{ \
	224	(char *)#name, type, offsetof(struct wrap_graph, name), \
	225	READONLY, (char *)#name " (" #type ")" \
	226	}
29ad6f68 DL	227	static PyMemberDef members_graph[] = {
	228	member(definition, T_STRING),
	229	{},
	230	};
	231	#undef member
	232
	233	/* graph.first() - root node */
	234	static PyObject graph_first(PyObject self, PyObject *args)
	235	{
	236	struct wrap_graph gwrap = (struct wrap_graph )self;
	237	struct graph_node *gn = vector_slot(gwrap->graph->nodes, 0);
	238	return graph_to_pyobj(gwrap, gn);
	239	};
	240
	241	static PyMethodDef methods_graph[] = {
	242	{"first", graph_first, METH_NOARGS, "first graph node"},
d62a17ae	243	{}};
29ad6f68	244
d62a17ae	245	static PyObject graph_parse(PyTypeObject type, PyObject *args,
d62a17ae	246	PyObject *kwds);
29ad6f68 DL	247
	248	static void graph_wrap_free(void *arg)
	249	{
	250	struct wrap_graph *wgraph = arg;
	251	free(wgraph->nodewrappers);
	252	free(wgraph->definition);
	253	}
	254
	255	static PyTypeObject typeobj_graph = {
d62a17ae	256	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.Graph",
	257	.tp_basicsize = sizeof(struct wrap_graph),
	258	.tp_flags = Py_TPFLAGS_DEFAULT,
	259	.tp_doc = "struct graph *",
	260	.tp_new = graph_parse,
	261	.tp_free = graph_wrap_free,
	262	.tp_members = members_graph,
	263	.tp_methods = methods_graph,
29ad6f68 DL	264	};
	265
	266	/* top call / entrypoint for python code */
	267	static PyObject graph_parse(PyTypeObject type, PyObject args, PyObject kwds)
	268	{
	269	const char def, doc = NULL;
	270	struct wrap_graph *gwrap;
d62a17ae	271	static const char *kwnames[] = {"cmddef", "doc", NULL};
29ad6f68 DL	272
	273	gwrap = (struct wrap_graph *)typeobj_graph.tp_alloc(&typeobj_graph, 0);
	274	if (!gwrap)
	275	return NULL;
	276
d62a17ae	277	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s\|s", (char **)kwnames,
d62a17ae	278	&def, &doc))
29ad6f68 DL	279	return NULL;
29ad6f68 DL	280
d62a17ae	281	struct graph *graph = graph_new();
	282	struct cmd_token *token = cmd_token_new(START_TKN, 0, NULL, NULL);
	283	graph_new_node(graph, token, (void ()(void )) & cmd_token_del);
29ad6f68	284
d62a17ae	285	struct cmd_element cmd = {.string = def, .doc = doc};
	286	cmd_graph_parse(graph, &cmd);
	287	cmd_graph_names(graph);
29ad6f68 DL	288
	289	gwrap->graph = graph;
	290	gwrap->definition = strdup(def);
	291	gwrap->nodewrappers = calloc(vector_active(graph->nodes),
d62a17ae	292	sizeof(gwrap->nodewrappers[0]));
29ad6f68 DL	293	return (PyObject *)gwrap;
	294	}
	295
	296	static PyMethodDef clippy_methods[] = {
	297	{"parse", clippy_parse, METH_VARARGS, "Parse a C file"},
d62a17ae	298	{NULL, NULL, 0, NULL}};
29ad6f68 DL	299
	300	#if PY_MAJOR_VERSION >= 3
	301	static struct PyModuleDef pymoddef_clippy = {
	302	PyModuleDef_HEAD_INIT,
	303	"_clippy",
	304	NULL, /* docstring */
	305	-1,
	306	clippy_methods,
	307	};
	308	#define modcreate() PyModule_Create(&pymoddef_clippy)
	309	#define initret(val) return val;
	310	#else
	311	#define modcreate() Py_InitModule("_clippy", clippy_methods)
d62a17ae	312	#define initret(val) \
	313	do { \
	314	if (!val) \
	315	Py_FatalError("initialization failure"); \
	316	return; \
	317	} while (0)
29ad6f68 DL	318	#endif
	319
	320	PyMODINIT_FUNC command_py_init(void)
	321	{
d62a17ae	322	PyObject *pymod;
29ad6f68 DL	323
	324	if (PyType_Ready(&typeobj_graph_node) < 0)
	325	initret(NULL);
	326	if (PyType_Ready(&typeobj_graph) < 0)
	327	initret(NULL);
	328
	329	pymod = modcreate();
	330	if (!pymod)
	331	initret(NULL);
	332
	333	Py_INCREF(&typeobj_graph_node);
	334	PyModule_AddObject(pymod, "GraphNode", (PyObject *)&typeobj_graph_node);
	335	Py_INCREF(&typeobj_graph);
	336	PyModule_AddObject(pymod, "Graph", (PyObject *)&typeobj_graph);
	337	initret(pymod);
	338	}