/* Copyright Joyent, Inc. and other Node 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 "task.h"
#include "uv.h"

/* Update this is you're going to run > 1000 concurrent requests. */
#define MAX_CONNS 1000

#define NANOSEC ((uint64_t)10e8)

/* Base class for tcp_conn_rec and pipe_conn_rec.
 * The ordering of fields matters!
 */
typedef struct {
  uv_connect_t conn_req;
  uv_write_t write_req;
  uv_stream_t stream;
} conn_rec;

typedef struct {
  uv_connect_t conn_req;
  uv_write_t write_req;
  uv_tcp_t stream;
} tcp_conn_rec;

typedef struct {
  uv_connect_t conn_req;
  uv_write_t write_req;
  uv_pipe_t stream;
} pipe_conn_rec;

static char buffer[] = "QS";

static tcp_conn_rec tcp_conns[MAX_CONNS];
static pipe_conn_rec pipe_conns[MAX_CONNS];

static uint64_t start_time;
static uint64_t end_time;
static int closed_streams;
static int conns_failed;

typedef void *(*setup_fn)(int num, void* arg);
typedef int (*connect_fn)(int num, void* handles, void* arg);

static uv_buf_t alloc_cb(uv_stream_t* stream, size_t suggested_size);
static void connect_cb(uv_connect_t* conn_req, int status);
static void read_cb(uv_stream_t* stream, ssize_t nread, uv_buf_t buf);
static void close_cb(uv_handle_t* handle);


static uv_buf_t alloc_cb(uv_stream_t* stream, size_t suggested_size) {
  static char slab[65536];
  uv_buf_t buf;
  buf.base = slab;
  buf.len = sizeof(slab);
  return buf;
}


static void connect_cb(uv_connect_t* req, int status) {
  conn_rec* conn;
  uv_buf_t buf;
  int r;

  if (status != 0) {
    uv_close((uv_handle_t*)req->handle, close_cb);
    conns_failed++;
    return;
  }

  ASSERT(req != NULL);
  ASSERT(status == 0);

  conn = req->data;
  ASSERT(conn != NULL);

  r = uv_read_start(&conn->stream, alloc_cb, read_cb);
  ASSERT(r == 0);

  buf.base = buffer;
  buf.len = sizeof(buffer) - 1;

  r = uv_write(&conn->write_req, &conn->stream, &buf, 1, NULL);
  ASSERT(r == 0);
}


static void read_cb(uv_stream_t* stream, ssize_t nread, uv_buf_t buf) {
  ASSERT(stream != NULL);
  ASSERT(nread == -1 && uv_last_error().code == UV_EOF);
  uv_close((uv_handle_t*)stream, close_cb);
}


static void close_cb(uv_handle_t* handle) {
  ASSERT(handle != NULL);
  closed_streams++;
}


static void* tcp_do_setup(int num, void* arg) {
  tcp_conn_rec* pe;
  tcp_conn_rec* p;
  int r;

  for (p = tcp_conns, pe = p + num; p < pe; p++) {
    r = uv_tcp_init(&p->stream);
    ASSERT(r == 0);
  }

  return tcp_conns;
}


static void* pipe_do_setup(int num, void* arg) {
  pipe_conn_rec* pe;
  pipe_conn_rec* p;
  int r;

  for (p = pipe_conns, pe = p + num; p < pe; p++) {
    r = uv_pipe_init(&p->stream);
    ASSERT(r == 0);
  }

  return pipe_conns;
}


static int tcp_do_connect(int num, void* conns, void* arg) {
  struct sockaddr_in addr;
  tcp_conn_rec* pe;
  tcp_conn_rec* p;
  int r;

  addr = uv_ip4_addr("127.0.0.1", TEST_PORT);
  for (p = tcp_conns, pe = p + num; p < pe; p++) {
    r = uv_tcp_connect(&p->conn_req, &p->stream, addr, connect_cb);
    ASSERT(r == 0);

    p->conn_req.data = p;
  }

  return 0;
}


static int pipe_do_connect(int num, void* conns, void* arg) {
  pipe_conn_rec* pe;
  pipe_conn_rec* p;
  int r;

  for (p = pipe_conns, pe = p + num; p < pe; p++) {
    r = uv_pipe_connect(&p->conn_req, &p->stream, TEST_PIPENAME, connect_cb);
    ASSERT(r == 0);

    p->conn_req.data = p;
  }

  return 0;
}


static int pound_it(int concurrency,
                    const char* type,
                    setup_fn do_setup,
                    connect_fn do_connect,
                    void* arg) {
  double secs;
  void* state;
  int r;

  uv_init();

  /* Run benchmark for at least five seconds. */
  start_time = uv_hrtime();
  do {
    state = do_setup(concurrency, arg);
    ASSERT(state != NULL);

    r = do_connect(concurrency, state, arg);
    ASSERT(!r);

    uv_run();

    end_time = uv_hrtime();
  }
  while ((end_time - start_time) < 5 * NANOSEC);

  /* Number of fractional seconds it took to run the benchmark. */
  secs = (double)(end_time - start_time) / NANOSEC;

  LOGF("%s-conn-pound-%d: %.0f accepts/s (%d failed)\n",
       type,
       concurrency,
       closed_streams / secs,
       conns_failed);

  return 0;
}


BENCHMARK_IMPL(tcp4_pound_100) {
  return pound_it(100, "tcp", tcp_do_setup, tcp_do_connect, NULL);
}


BENCHMARK_IMPL(tcp4_pound_1000) {
  return pound_it(1000, "tcp", tcp_do_setup, tcp_do_connect, NULL);
}


BENCHMARK_IMPL(pipe_pound_100) {
  return pound_it(100, "pipe", pipe_do_setup, pipe_do_connect, NULL);
}


BENCHMARK_IMPL(pipe_pound_1000) {
  return pound_it(1000, "pipe", pipe_do_setup, pipe_do_connect, NULL);
}