/* Copyright libuv project contributors. All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#include "uv.h"

#include "task.h"

#include <stdlib.h>

#include <stdio.h>

/* Run the benchmark for this many ms */

#define TIME 5000

typedef struct {

  int pongs;

  int state;

  uv_udp_t udp;

  struct sockaddr_in server_addr;

} pinger_t;

typedef struct buf_s {

  uv_buf_t uv_buf_t;

  struct buf_s* next;

} buf_t;

static char PING[] = "PING\n";

static uv_loop_t* loop;

static int completed_pingers;

static unsigned long completed_pings;

static int64_t start_time;

static void buf_alloc(uv_handle_t* tcp, size_t size, uv_buf_t* buf) {

  static char slab[64 * 1024];

  buf->base = slab;

  buf->len = sizeof(slab);

}

static void buf_free(const uv_buf_t* buf) {

}

static void pinger_close_cb(uv_handle_t* handle) {

  pinger_t* pinger;

  pinger = (pinger_t*)handle->data;

#if DEBUG

  fprintf(stderr, "ping_pongs: %d roundtrips/s\n",

	  pinger->pongs / (TIME / 1000));

#endif

  completed_pings += pinger->pongs;

  completed_pingers++;

  free(pinger);

}

static void pinger_write_ping(pinger_t* pinger) {

  uv_buf_t buf;

  int r;

  buf = uv_buf_init(PING, sizeof(PING) - 1);

  r = uv_udp_try_send(&pinger->udp, &buf, 1,

                      (const struct sockaddr*) &pinger->server_addr);

  if (r < 0)

    FATAL("uv_udp_send failed");

}

static void pinger_read_cb(uv_udp_t* udp,

                           ssize_t nread,

                           const uv_buf_t* buf,

                           const struct sockaddr* addr,

                           unsigned flags) {

  ssize_t i;

  pinger_t* pinger;

  pinger = (pinger_t*)udp->data;

  /* Now we count the pings */

  for (i = 0; i < nread; i++) {

    ASSERT(buf->base[i] == PING[pinger->state]);

    pinger->state = (pinger->state + 1) % (sizeof(PING) - 1);

    if (pinger->state == 0) {

      pinger->pongs++;

      if (uv_now(loop) - start_time > TIME) {

        uv_close((uv_handle_t*)udp, pinger_close_cb);

        break;

      }

      pinger_write_ping(pinger);

    }

  }

  buf_free(buf);

}

static void udp_pinger_new(void) {

  pinger_t* pinger = malloc(sizeof(*pinger));

  int r;

  ASSERT(0 == uv_ip4_addr("127.0.0.1", TEST_PORT, &pinger->server_addr));

  pinger->state = 0;

  pinger->pongs = 0;

  /* Try to do NUM_PINGS ping-pongs (connection-less). */

  r = uv_udp_init(loop, &pinger->udp);

  ASSERT(r == 0);

  pinger->udp.data = pinger;

  /* Start pinging */

  if (0 != uv_udp_recv_start(&pinger->udp, buf_alloc, pinger_read_cb)) {

    FATAL("uv_udp_read_start failed");

  }

  pinger_write_ping(pinger);

}

static int ping_udp(unsigned pingers) {

  unsigned i;

  loop = uv_default_loop();

  start_time = uv_now(loop);

  for (i = 0; i < pingers; ++i) {

    udp_pinger_new();

  }

  uv_run(loop, UV_RUN_DEFAULT);

  ASSERT(completed_pingers >= 1);

  fprintf(stderr, "ping_pongs: %d pingers, ~ %lu roundtrips/s\n",

          completed_pingers, completed_pings / (TIME/1000));

  MAKE_VALGRIND_HAPPY();

  return 0;

}

#define X(PINGERS) \

BENCHMARK_IMPL(ping_udp##PINGERS) {\

  return ping_udp(PINGERS); \

}

X(1)

X(10)

X(100)

#undef X