/* Copyright libuv 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 <stdio.h>

#include <stdlib.h>

#include <string.h>

#define CHECK_HANDLE(handle) \

  ASSERT((uv_udp_t*)(handle) == &recver || (uv_udp_t*)(handle) == &sender)

#define BUFFER_MULTIPLIER 4

#define MAX_DGRAM_SIZE (64 * 1024)

#define NUM_SENDS 8

#define EXPECTED_MMSG_ALLOCS (NUM_SENDS / BUFFER_MULTIPLIER)

static uv_udp_t recver;

static uv_udp_t sender;

static int recv_cb_called;

static int close_cb_called;

static int alloc_cb_called;

static void alloc_cb(uv_handle_t* handle,

                     size_t suggested_size,

                     uv_buf_t* buf) {

  size_t buffer_size;

  CHECK_HANDLE(handle);

  /* Only allocate enough room for multiple dgrams if we can actually recv them */

  buffer_size = MAX_DGRAM_SIZE;

  if (uv_udp_using_recvmmsg((uv_udp_t*)handle))

    buffer_size *= BUFFER_MULTIPLIER;

  /* Actually malloc to exercise free'ing the buffer later */

  buf->base = malloc(buffer_size);

  ASSERT(buf->base != NULL);

  buf->len = buffer_size;

  alloc_cb_called++;

}

static void close_cb(uv_handle_t* handle) {

  CHECK_HANDLE(handle);

  ASSERT(uv_is_closing(handle));

  close_cb_called++;

}

static void recv_cb(uv_udp_t* handle,

                       ssize_t nread,

                       const uv_buf_t* rcvbuf,

                       const struct sockaddr* addr,

                       unsigned flags) {

  ASSERT_GE(nread, 0);

  /* free and return if this is a mmsg free-only callback invocation */

  if (flags & UV_UDP_MMSG_FREE) {

    ASSERT_EQ(nread, 0);

    ASSERT(addr == NULL);

    free(rcvbuf->base);

    return;

  }

  ASSERT_EQ(nread, 4);

  ASSERT(addr != NULL);

  ASSERT_MEM_EQ("PING", rcvbuf->base, nread);

  recv_cb_called++;

  if (recv_cb_called == NUM_SENDS) {

    uv_close((uv_handle_t*)handle, close_cb);

    uv_close((uv_handle_t*)&sender, close_cb);

  }

  /* Don't free if the buffer could be reused via mmsg */

  if (rcvbuf && !(flags & UV_UDP_MMSG_CHUNK))

    free(rcvbuf->base);

}

TEST_IMPL(udp_mmsg) {

  struct sockaddr_in addr;

  uv_buf_t buf;

  int i;

  ASSERT_EQ(0, uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));

  ASSERT_EQ(0, uv_udp_init_ex(uv_default_loop(), &recver,

                              AF_UNSPEC | UV_UDP_RECVMMSG));

  ASSERT_EQ(0, uv_udp_bind(&recver, (const struct sockaddr*) &addr, 0));

  ASSERT_EQ(0, uv_udp_recv_start(&recver, alloc_cb, recv_cb));

  ASSERT_EQ(0, uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));

  ASSERT_EQ(0, uv_udp_init(uv_default_loop(), &sender));

  buf = uv_buf_init("PING", 4);

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

    ASSERT_EQ(4, uv_udp_try_send(&sender, &buf, 1, (const struct sockaddr*) &addr));

  }

  ASSERT_EQ(0, uv_run(uv_default_loop(), UV_RUN_DEFAULT));

  ASSERT_EQ(close_cb_called, 2);

  ASSERT_EQ(recv_cb_called, NUM_SENDS);

  ASSERT_EQ(sender.send_queue_size, 0);

  ASSERT_EQ(recver.send_queue_size, 0);

  printf("%d allocs for %d recvs\n", alloc_cb_called, recv_cb_called);

  /* On platforms that don't support mmsg, each recv gets its own alloc */

  if (uv_udp_using_recvmmsg(&recver))

    ASSERT_EQ(alloc_cb_called, EXPECTED_MMSG_ALLOCS);

  else

    ASSERT_EQ(alloc_cb_called, recv_cb_called);

  MAKE_VALGRIND_HAPPY();

  return 0;

}