lyd_replace.c

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <err.h>

#include <libyang/libyang.h>

static struct ly_ctx *ly_ctx;

static void lyd_replace(struct lyd_node *target, struct lyd_node *source)
{
	struct lyd_difflist *diff;

	diff = lyd_diff(target, source, 0);
	for (int i = 0; diff->type[i] != LYD_DIFF_END; i++) {
		struct lyd_node *dnode;
		struct lyd_node_leaf_list *leaf_dst, *leaf_src;

		switch (diff->type[i]) {
		case LYD_DIFF_CREATED:
			dnode = diff->second[i];
			if (diff->first[i]) {
				dnode = lyd_dup(dnode, LYD_DUP_OPT_RECURSIVE);
				lyd_insert(diff->first[i], dnode);
			} else
				lyd_merge(target, dnode, LYD_OPT_NOSIBLINGS);
			break;
		case LYD_DIFF_DELETED:
			dnode = diff->first[i];
			lyd_free(dnode);
			break;
		case LYD_DIFF_CHANGED:
			leaf_src = (struct lyd_node_leaf_list *)diff->first[i];
			leaf_dst = (struct lyd_node_leaf_list *)diff->second[i];
			lyd_change_leaf(leaf_dst, leaf_src->value_str);
			break;
		case LYD_DIFF_MOVEDAFTER1:
		case LYD_DIFF_MOVEDAFTER2:
			/* TODO */
		default:
			continue;
		}
	}

	lyd_free_diff(diff);
}

#if 0
static void print(struct lyd_node *config)
{
	lyd_print_fd(2, config, LYD_JSON, LYP_FORMAT | LYP_WITHSIBLINGS);
}
#endif

static void validate(struct lyd_node **config)
{
	if (lyd_validate(config,
			 LYD_OPT_STRICT | LYD_OPT_CONFIG | LYD_OPT_WHENAUTODEL,
			 ly_ctx)
	    != 0)
		errx(1, "lyd_validate(): %s", ly_errmsg(ly_ctx));
}

int main(int argc, char **argv)
{
	struct lyd_node *running = NULL, *candidate = NULL;

	/* initialization */
	ly_ctx = ly_ctx_new("/usr/local/share/yang/", 0);
	if (!ly_ctx)
		errx(1, "ly_ctx_new()");

	if (ly_ctx_load_module(ly_ctx, "frr-isisd", NULL) == NULL)
		errx(1, "ly_ctx_load_module(): %s", ly_errmsg(ly_ctx));

	/* initialize running and candidate configs */
	validate(&running);
	validate(&candidate);

	/* first config change */
	lyd_new_path(
		candidate, ly_ctx,
		"/frr-isisd:isis/instance[area-tag='1']",
		NULL, 0, LYD_PATH_OPT_UPDATE);
	validate(&candidate);
	(void)lyd_diff(running, candidate, 0);
	lyd_replace(running, candidate);

	/* second config change */
	lyd_new_path(
		candidate, ly_ctx,
		"/frr-isisd:isis/instance[area-tag='1']/redistribute/ipv4[protocol='ospf'][level='level-1']",
		NULL, 0, LYD_PATH_OPT_UPDATE);
	validate(&candidate);
	(void)lyd_diff(running, candidate, 0);
	lyd_replace(running, candidate);

	/* third config change */
	lyd_new_path(
		candidate, ly_ctx,
		"/frr-isisd:isis/instance[area-tag='1']/redistribute/ipv4[protocol='rip'][level='level-1']",
		NULL, 0, LYD_PATH_OPT_UPDATE);
	validate(&candidate);
	(void)lyd_diff(running, candidate, 0);
	lyd_replace(running, candidate);

#if 0
	/* print configs */
	printf("=================\n");
	printf("Running config:\n");
	printf("=================\n");
	print(running);
	printf("=================\n");
	printf("Candidate config:\n");
	printf("=================\n");
	print(candidate);
#endif

	/* cleanup */
	lyd_free_withsiblings(running);
	lyd_free_withsiblings(candidate);
	ly_ctx_destroy(ly_ctx, NULL);

	return 0;
}