VILLASnode/lib/hooks/map.c

/** Override a value of the sample with a header, timestamp or statistic value.
 *
 * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
 * @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
 * @license GNU General Public License (version 3)
 *
 * VILLASnode
 *
 * 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 3 of the License, or
 * 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.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************************/

/** @addtogroup hooks Hook functions
 * @{
 */

#include "plugin.h"
#include "mapping.h"
#include "list.h"
#include "utils.h"
#include "path.h"

struct map {
	struct mapping mapping;

	struct stats *stats;
};

static int map_init(struct hook *h)
{
	struct map *p = h->_vd;

	return mapping_init(&p->mapping);
}

static int map_destroy(struct hook *h)
{
	struct map *p = h->_vd;

	return mapping_destroy(&p->mapping);
}

static int map_parse(struct hook *h, config_setting_t *cfg)
{
	int ret;
	struct map *p = h->_vd;
	config_setting_t *cfg_mapping;

	cfg_mapping = config_setting_lookup(cfg, "mapping");
	if (!cfg_mapping || !config_setting_is_array(cfg_mapping))
		return -1;

	ret = mapping_parse(&p->mapping, cfg_mapping);
	if (ret)
		return ret;

	return 0;
}

static int map_read(struct hook *h, struct sample *smps[], size_t *cnt)
{
	int ret;
	struct map *p = h->_vd;
	struct sample *tmp[*cnt];

	if (*cnt <= 0)
		return 0;

	ret = sample_alloc((struct pool *) ((char* ) smps[0] + smps[0]->pool_off), tmp, *cnt);
	if (ret != *cnt)
		return ret;

	for (int i = 0; i < *cnt; i++) {
		mapping_remap(&p->mapping, smps[i], tmp[i], NULL);

		SWAP(smps[i], tmp[i]);
	}

	sample_free(tmp, *cnt);

	return 0;
}

static struct plugin p = {
	.name		= "map",
	.description	= "Remap values and / or add header, timestamp values to the sample",
	.type		= PLUGIN_TYPE_HOOK,
	.hook		= {
		.priority = 99,
		.init	= map_init,
		.destroy= map_destroy,
		.parse	= map_parse,
		.read	= map_read,
		.size	= sizeof(struct map)
	}
};

REGISTER_PLUGIN(&p);

/** @} */