owlps/owlps-positioning/src/outputudpsocket.cc

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

#include <owlps.h>

#include <sstream>
#include <cstdio> // For perror()

using namespace std ;



/* *** Constructors *** */


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

}


OutputUDPSocket::~OutputUDPSocket()
{
  close_socket() ;
}



/* *** Operations *** */


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


/**
 * Normally, the socket is closed automatically by the destructor. Use
 * this if you want to close the socket prematurely.
 * #sockfd is set to -1, even in case of error.
 * @return \em true if the socket were successfully closed or were not
 * opened.
 * @return \em false in case of error.
 */
bool OutputUDPSocket::close_socket()
{
  if (sockfd >= 0)
    {
      if (close(sockfd))
        {
          perror("Cannot close UDP socket") ;
          return false ;
        }

      sockfd = -1 ;
    }

  return true ;
}


void OutputUDPSocket::write(const Result &result)
{
  send_data(result.to_csv()) ;
}


void OutputUDPSocket::write(const ResultList &results)
{
  if (! results.empty())
    send_data(results.to_csv()) ;
}


/**
 * Sends the text buffer 'data'.
 */
void OutputUDPSocket::send_data(const string &data)
{
  ssize_t nsent = sendto(sockfd, data.c_str(), data.size(), 0,
                         (struct sockaddr *) &server_info,
                         sizeof(server_info)) ;
  if (nsent != static_cast<ssize_t>(data.size()))
    perror("Error sending result data") ;
}