owlps/owlps-positioner/outputudpsocket.cc

/*
 * This file is part of the Owl Positioning System (OwlPS) project.
 * It is subject to the copyright notice and license terms in the
 * COPYRIGHT.t2t file found in the top-level directory of this
 * distribution and at
 *   https://code.lm7.fr/mcy/owlps/src/master/COPYRIGHT.t2t
 * No part of the OwlPS Project, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms
 * contained in the COPYRIGHT.t2t file; the COPYRIGHT.t2t file must be
 * distributed along with this file, either separately or by replacing
 * this notice by the COPYRIGHT.t2t file's contents.
 */


#include "outputudpsocket.hh"
#include "request.hh"
#include "resultlist.hh"
#include "result.hh"
#include "posexcept.hh"

#include <owlps.h>

#include <cstdio> // For perror()

using namespace std ;



/* *** Constructors *** */


OutputUDPSocket::OutputUDPSocket(const string &_remote_host,
                                 const uint_fast16_t _remote_port):
  OutputNetworkSocket(_remote_host, _remote_port)
{
  if (! init_socket())
    throw error_opening_output_file("UDP socket") ;
}



/* *** Operations *** */


/**
 * @returns `true` if the socket were successfully opened.
 * @returns `false` in case of error.
 */
bool OutputUDPSocket::init_socket()
{
  sockfd = owl_create_udp_trx_socket(remote_host.c_str(), remote_port,
                                     &server_info) ;
  return sockfd >= 0 ;
}


/**
 * Sends the text buffer 'data'.
 */
bool OutputUDPSocket::send_data(const string &data) const
{
  unsigned int data_len = data.size() + 1 ; // +1 for the '\0'
  ssize_t nsent = sendto(sockfd, data.c_str(), data_len, 0,
                         &server_info, sizeof(server_info)) ;
  if (nsent != static_cast<ssize_t>(data_len))
    {
      perror("Error sending result data through the UDP socket") ;
      return false ;
    }
  return true ;
}