/****************************************************************************
 * examples/tcpblaster/tcpblaster_client.c
 *
 *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name Gregory Nutt nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "config.h"

#include <sys/socket.h>
#include <netinet/in.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <poll.h>
#include <string.h>
#include <errno.h>

#include <arpa/inet.h>

#include "tcpblaster.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

void tcpblaster_client(void)
{
#ifdef CONFIG_EXAMPLES_TCPBLASTER_IPv6
  struct sockaddr_in6 server;
#else
  struct sockaddr_in server;
#endif
  struct timespec start;
  socklen_t addrlen;
  char *outbuf;
  unsigned long sendtotal;
  unsigned long totallost;
  int sendcount;
  int partials;
  int sockfd;
  int nbytessent;
  int ch;
  int i;

  /* Allocate buffers */

  outbuf = (char*)malloc(SENDSIZE);
  if (!outbuf)
    {
      printf("client: failed to allocate buffers\n");
      exit(1);
    }

  /* Create a new TCP socket */

  sockfd = socket(PF_INETX, SOCK_STREAM, 0);
  if (sockfd < 0)
    {
      printf("client socket failure %d\n", errno);
      goto errout_with_buffers;
    }

  /* Set up the server address */

#ifdef CONFIG_EXAMPLES_TCPBLASTER_IPv6
  server.sin6_family            = AF_INET6;
  server.sin6_port              = HTONS(CONFIG_EXAMPLES_TCPBLASTER_SERVER_PORTNO);
  memcpy(server.sin6_addr.s6_addr16, g_tcpblasterserver_ipv6, 8 * sizeof(uint16_t));
  addrlen                       = sizeof(struct sockaddr_in6);

  printf("Connecting to IPv6 Address: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
         g_tcpblasterserver_ipv6[0], g_tcpblasterserver_ipv6[1], g_tcpblasterserver_ipv6[2], g_tcpblasterserver_ipv6[3],
         g_tcpblasterserver_ipv6[4], g_tcpblasterserver_ipv6[5], g_tcpblasterserver_ipv6[6], g_tcpblasterserver_ipv6[7]);
#else
  server.sin_family             = AF_INET;
  server.sin_port               = HTONS(CONFIG_EXAMPLES_TCPBLASTER_SERVER_PORTNO);
  server.sin_addr.s_addr        = (in_addr_t)g_tcpblasterserver_ipv4;
  addrlen                       = sizeof(struct sockaddr_in);

  printf("Connecting to IPv4 Address: %08lx\n", (unsigned long)g_tcpblasterserver_ipv4);
#endif

  /* Connect the socket to the server */

  if (connect( sockfd, (struct sockaddr*)&server, addrlen) < 0)
    {
      printf("client: connect failure: %d\n", errno);
      goto errout_with_socket;
    }

  printf("client: Connected\n");

  /* Initialize the buffer */

  ch = 0x20;
  for (i = 0; i < SENDSIZE; i++ )
    {
      outbuf[i] = ch;
      if (++ch > 0x7e)
        {
          ch = 0x20;
        }
    }

  /* Then send messages forever */

  sendcount = 0;
  sendtotal = 0;
  partials  = 0;
  totallost = 0;

  (void)clock_gettime(CLOCK_REALTIME, &start);

  for (; ; )
    {
#ifdef CONFIG_EXAMPLES_TCPBLASTER_POLLOUT
      struct pollfd fds[1];
      int ret;

      memset(fds, 0, 1 * sizeof(struct pollfd));
      fds[0].fd     = sockfd;
      fds[0].events = POLLOUT | POLLHUP;

      /* Wait until we can send data or until the connection is lost */

      ret = poll(fds, 1, -1);
      if (ret < 0)
        {
          printf("client: ERROR poll failed: %d\n", errno);
          goto errout_with_socket;
        }

      if ((fds[0].revents & POLLHUP) != 0)
        {
          printf("client: WARNING poll returned POLLHUP\n");
          goto errout_with_socket;
        }
#endif

      nbytessent = send(sockfd, outbuf, SENDSIZE, 0);
      if (nbytessent < 0)
        {
          printf("client: send failed: %d\n", errno);
          goto errout_with_socket;
        }
      else if (nbytessent > 0 && nbytessent < SENDSIZE)
        {
          /* Partial buffers can be sent if there is insufficient buffering
           * space to buffer the whole SENDSIZE request.  This is not an
           * error, but is an interesting thing to keep track of.
           */

          partials++;
          totallost += (SENDSIZE - nbytessent);
        }
      else if (nbytessent != SENDSIZE)
        {
          printf("client: Bad send length=%d: %d of \n",
                  nbytessent, SENDSIZE);
          goto errout_with_socket;
        }

      sendtotal += nbytessent;

      if (++sendcount >= 50)
        {
          struct timespec elapsed;
          struct timespec curr;
          float fkbrecvd;
          float felapsed;

          (void)clock_gettime(CLOCK_REALTIME, &curr);

          elapsed.tv_sec  = curr.tv_sec - start.tv_sec;
          if (curr.tv_nsec >= start.tv_nsec)
            {
              elapsed.tv_nsec = curr.tv_nsec - start.tv_nsec;
            }
          else
            {
              unsigned long borrow = 1000000000 - start.tv_nsec;
              elapsed.tv_sec--;
              elapsed.tv_nsec = curr.tv_nsec + borrow;
            }

          fkbrecvd  = (float)sendtotal / 1024.0;
          felapsed = (float)elapsed.tv_sec + (float)elapsed.tv_nsec / 1000000000.0;
          printf("Sent %d buffers:  %7.1f Kb (avg %5.1f Kb) in %6.2f Sec (%7.1f Kb/Sec)\n",
                  sendcount, fkbrecvd, fkbrecvd/sendcount, felapsed, fkbrecvd/felapsed);

          if (partials > 0)
            {
              float fkblost;

              fkblost = (float)totallost / 1024.0;
              printf("Partial buffers sent: %d Data not sent: %7.1f Kb\n",
                     partials, fkblost);
            }

          sendcount  = 0;
          sendtotal  = 0;
          partials   = 0;
          totallost  = 0;

          (void)clock_gettime(CLOCK_REALTIME, &start);
       }
    }

  free(outbuf);
  return;

errout_with_socket:
  close(sockfd);

errout_with_buffers:
  free(outbuf);
  exit(1);
}
