VILLASnode/include/villas/formats/json.hpp

/** JSON serializtion sample data.
 *
 * @author Steffen Vogel <post@steffenvogel.de>
 * @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
 * @license Apache 2.0
 *********************************************************************************/

#pragma once

#include <jansson.h>

#include <villas/format.hpp>

namespace villas {
namespace node {

/* Forward declarations */
struct Sample;

class JsonFormat : public Format {

protected:
	static enum SignalType detect(const json_t *val);

	json_t * packTimestamps(const struct Sample *smp);
	int unpackTimestamps(json_t *json_ts, struct Sample *smp);

	virtual
	int packSample(json_t **j, const struct Sample *smp);
	virtual
	int packSamples(json_t **j, const struct Sample * const smps[], unsigned cnt);
	virtual
	int unpackSample(json_t *json_smp, struct Sample *smp);
	virtual
	int unpackSamples(json_t *json_smps, struct Sample * const smps[], unsigned cnt);

	int dump_flags;

public:
	JsonFormat(int fl) :
		Format(fl),
		dump_flags(0)
	{ }

	virtual
	int sscan(const char *buf, size_t len, size_t *rbytes, struct Sample * const smps[], unsigned cnt);
	virtual
	int sprint(char *buf, size_t len, size_t *wbytes, const struct Sample * const smps[], unsigned cnt);

	virtual
	int print(FILE *f, const struct Sample * const smps[], unsigned cnt);
	virtual
	int scan(FILE *f, struct Sample * const smps[], unsigned cnt);

	virtual
	void parse(json_t *json);
};

} // namespace node
} // namespace villas