pgm_socket.hpp

/*
    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file

    This file is part of libzmq, the ZeroMQ core engine in C++.

    libzmq is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    As a special exception, the Contributors give you permission to link
    this library with independent modules to produce an executable,
    regardless of the license terms of these independent modules, and to
    copy and distribute the resulting executable under terms of your choice,
    provided that you also meet, for each linked independent module, the
    terms and conditions of the license of that module. An independent
    module is a module which is not derived from or based on this library.
    If you modify this library, you must extend this exception to your
    version of the library.

    libzmq 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 Lesser General Public
    License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef __PGM_SOCKET_HPP_INCLUDED__
#define __PGM_SOCKET_HPP_INCLUDED__

#include "platform.hpp"

#if defined ZMQ_HAVE_OPENPGM

#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#define __PGM_WININT_H__
#endif

#include <pgm/pgm.h>

#if defined(ZMQ_HAVE_OSX) || defined(ZMQ_HAVE_NETBSD)
#include <pgm/in.h>
#endif

#include "fd.hpp"
#include "options.hpp"

namespace zmq
{
    //  Encapsulates PGM socket.
    class pgm_socket_t
    {

    public:

        //  If receiver_ is true PGM transport is not generating SPM packets.
        pgm_socket_t (bool receiver_, const options_t &options_);

        //  Closes the transport.
        ~pgm_socket_t ();

        //  Initialize PGM network structures (GSI, GSRs).
        int init (bool udp_encapsulation_, const char *network_);

        //  Resolve PGM socket address.
        static int init_address(const char *network_, struct pgm_addrinfo_t **addr, uint16_t *port_number);

        //   Get receiver fds and store them into user allocated memory.
        void get_receiver_fds (fd_t *receive_fd_, fd_t *waiting_pipe_fd_);

        //   Get sender and receiver fds and store it to user allocated
        //   memory. Receive fd is used to process NAKs from peers.
        void get_sender_fds (fd_t *send_fd_, fd_t *receive_fd_,
            fd_t *rdata_notify_fd_, fd_t *pending_notify_fd_);

        //  Send data as one APDU, transmit window owned memory.
        size_t send (unsigned char *data_, size_t data_len_);

        //  Returns max tsdu size without fragmentation.
        size_t get_max_tsdu_size ();

        //  Receive data from pgm socket.
        ssize_t receive (void **data_, const pgm_tsi_t **tsi_);

        long get_rx_timeout ();
        long get_tx_timeout ();

        //  POLLIN on sender side should mean NAK or SPMR receiving.
        //  process_upstream function is used to handle such a situation.
        void process_upstream ();

    private:

        //  Compute size of the buffer based on rate and recovery interval.
        int compute_sqns (int tpdu_);

        //  OpenPGM transport.
        pgm_sock_t* sock;

        int last_rx_status, last_tx_status;

        //  Associated socket options.
        options_t options;

        //  true when pgm_socket should create receiving side.
        bool receiver;

        //  Array of pgm_msgv_t structures to store received data
        //  from the socket (pgm_transport_recvmsgv).
        pgm_msgv_t *pgm_msgv;

        //  Size of pgm_msgv array.
        size_t pgm_msgv_len;

        // How many bytes were read from pgm socket.
        size_t nbytes_rec;

        //  How many bytes were processed from last pgm socket read.
        size_t nbytes_processed;

        //  How many messages from pgm_msgv were already sent up.
        size_t pgm_msgv_processed;
    };
}
#endif

#endif