VILLASnode/lib/formats/json_edgeflex.cpp

/** JSON serializtion for edgeFlex project.
 *
 * @author Manuel Pitz <manuel.pitz@eonerc.rwth-aachen.de>
 * @copyright 2014-2020, 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/>.
 *********************************************************************************/

#include <cstring>

#include <villas/timing.h>
#include <villas/formats/json_edgeflex.hpp>

using namespace villas::node;

int JsonEdgeflexFormat::packSample(json_t **json_smp, const struct sample *smp)
{
	json_t *json_data;
	json_t *json_created = nullptr;

	if (smp->length < 1)
		return -1;


	json_data = json_object();

	for (unsigned i = 0; i < smp->length; i++) {
		struct signal *sig = (struct signal *) vlist_at_safe(smp->signals, i);
		if (!sig)
			return -1;

		json_object_set(json_data, sig->name, json_real(smp->data[i].f));
	}

	json_created = json_integer(time_to_double(&smp->ts.origin) * 1e3);
	json_object_set(json_data, "created", json_created);

	*json_smp = json_data;

	return 0;
}

int JsonEdgeflexFormat::unpackSample(json_t *json_smp, struct sample *smp)
{
	int ret;
	json_int_t created = -1;

	if (smp->capacity < 1)
		return -1;

	struct signal *sig = (struct signal *) vlist_at_safe(signals, 0);
	if (!sig)
		return -1;

	if (sig->type != SignalType::FLOAT)
		return -1;

	ret = json_unpack(json_smp, "{ s: f, s?: I }",
		"value", &smp->data[0].f,
		"created", &created
	);
	if (ret)
		return ret;

	if (created >= 0) {
		smp->ts.origin = time_from_double(created / 1e3);
		smp->flags |= (int) SampleFlags::HAS_TS_ORIGIN;
	}

	return 0;
}

static char n[] = "json.edgeflex";
static char d[] = "EdgeFlex JSON format";
static FormatPlugin<JsonEdgeflexFormat, n, d, (int) SampleFlags::HAS_TS_ORIGIN | (int) SampleFlags::HAS_SEQUENCE | (int) SampleFlags::HAS_DATA> p;