VILLASnode/include/villas/nodes/kafka.hpp

/* Node type: kafka.
 *
 * Author: Juan Pablo Noreña <jpnorenam@unal.edu.co>
 * SPDX-FileCopyrightText: 2021 Universidad Nacional de Colombia
 * SPDX-License-Identifier: Apache-2.0
 */

#pragma once

#include <librdkafka/rdkafka.h>

#include <villas/format.hpp>
#include <villas/pool.hpp>
#include <villas/queue_signalled.h>

namespace villas {
namespace node {

// Forward declarations
class NodeCompat;

struct kafka {
  struct CQueueSignalled queue;
  struct Pool pool;

  double timeout;  // Timeout in seconds.
  char *server;    // Hostname/IP:Port address of the bootstrap server.
  char *protocol;  // Security protocol.
  char *produce;   // Producer topic.
  char *consume;   // Consumer topic.
  char *client_id; // Client ID.

  struct {
    rd_kafka_t *client;
    rd_kafka_topic_t *topic;
  } producer;

  struct {
    rd_kafka_t *client;
    char *group_id; // Group id.
  } consumer;

  struct {
    char *ca; // SSL CA file.
  } ssl;

  struct {
    char *mechanisms; // SASL mechanisms.
    char *username;   // SSL CA path.
    char *password;   // SSL certificate.
  } sasl;

  Format *formatter;
};

int kafka_reverse(NodeCompat *n);

char *kafka_print(NodeCompat *n);

int kafka_init(NodeCompat *n);

int kafka_prepare(NodeCompat *n);

int kafka_parse(NodeCompat *n, json_t *json);

int kafka_start(NodeCompat *n);

int kafka_destroy(NodeCompat *n);

int kafka_stop(NodeCompat *n);

int kafka_type_start(SuperNode *sn);

int kafka_type_stop();

int kafka_poll_fds(NodeCompat *n, int fds[]);

int kafka_read(NodeCompat *n, struct Sample *const smps[], unsigned cnt);

int kafka_write(NodeCompat *n, struct Sample *const smps[], unsigned cnt);

} // namespace node
} // namespace villas