ExportInterface.cpp

/*
 *
 * (C) 2013-14 - ntop.org
 *
 *
 * 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
 * (at your option) 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, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#include "ntop_includes.h"


/* **************************************************** */

ExportInterface::ExportInterface(const char *_endpoint, const char *_topic) {
  topic = strdup(_topic), endpoint = strdup(_endpoint);

  if((context = zmq_ctx_new()) == NULL) {
    const char *msg = "Unable to initialize ZMQ context";

    ntop->getTrace()->traceEvent(TRACE_ERROR, msg);
    throw(msg);
  }

  if((publisher = zmq_socket(context, ZMQ_PUB)) == NULL) {
    const char *msg = "Unable to create ZMQ socket";

    ntop->getTrace()->traceEvent(TRACE_ERROR, msg);
    throw(msg);
  }

  if(zmq_bind(publisher, endpoint) != 0)
    ntop->getTrace()->traceEvent(TRACE_ERROR, "Unable to bind ZMQ endpoint %s: %s",
				 endpoint, strerror(errno));
  else
    ntop->getTrace()->traceEvent(TRACE_NORMAL,
				 "Successfully created ZMQ endpoint %s", endpoint);
}

/* **************************************************** */

ExportInterface::~ExportInterface() {
  if(topic)    free(topic);
  if(endpoint) free(endpoint);

  zmq_close(publisher);
  zmq_ctx_destroy(context);
}

/* **************************************************** */

void ExportInterface::export_data(char *json) {
  if(publisher) {
    struct zmq_msg_hdr msg_hdr;

    snprintf(msg_hdr.url, sizeof(msg_hdr.url), "%s", topic);
    msg_hdr.version = 0, msg_hdr.size = strlen(json);

    zmq_send(publisher, &msg_hdr, sizeof(msg_hdr), ZMQ_SNDMORE);
    zmq_send(publisher, json, msg_hdr.size, 0);
    ntop->getTrace()->traceEvent(TRACE_INFO, "[ZMQ] %s", json);
  }
}

/* **************************************************** */