/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * Test the speed of select within NSPR
 *
 */

#include "nspr.h"
#include "prpriv.h"

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#if defined(XP_UNIX)
#  include <unistd.h>
#endif

#ifdef DEBUG
#  define PORT_INC_DO +100
#else
#  define PORT_INC_DO
#endif
#ifdef IS_64
#  define PORT_INC_3264 +200
#else
#  define PORT_INC_3264
#endif

#define PORT_BASE 19000 PORT_INC_DO PORT_INC_3264

typedef struct timer_slot_t {
  unsigned long d_connect;
  unsigned long d_cl_data;
  unsigned long d_sv_data;
  unsigned long d_close;
  unsigned long d_total;
  unsigned long requests;
} timer_slot_t;

static long _iterations = 5;
static long _client_data = 8192;

static long _server_data = (128 * 1024);
static long _threads_max = 10, _threads = 10;

static int verbose = 0;
static PRMonitor* exit_cv;
static long _thread_exit_count;
static timer_slot_t* timer_data;
static PRThreadScope scope1, scope2;

void tally_results(int);

/* return the diff in microseconds */
unsigned long _delta(PRIntervalTime* start, PRIntervalTime* stop) {
  /*
   * Will C do the right thing with unsigned arithemtic?
   */
  return PR_IntervalToMicroseconds(*stop - *start);
}

int _readn(PRFileDesc* sock, char* buf, int len) {
  int rem;
  int bytes;

  for (rem = len; rem; rem -= bytes) {
    bytes = PR_Recv(sock, buf + len - rem, rem, 0, PR_INTERVAL_NO_TIMEOUT);
    if (bytes <= 0) {
      return -1;
    }
  }
  return len;
}

void _thread_exit(int id) {
  PR_EnterMonitor(exit_cv);
#ifdef DEBUG
  fprintf(stdout, "Thread %d EXIT\n", id);
#endif

  _thread_exit_count--;
  if (_thread_exit_count == 0) {
#ifdef DEBUG
    fprintf(stdout, "Thread %d EXIT triggered notify\n", id);
#endif
    PR_Notify(exit_cv);
  }
  PR_ExitMonitor(exit_cv);
}

void _server_thread(void* arg_id) {
  void _client_thread(void*);
  int* id = (int*)arg_id;
  PRFileDesc* sock;
  PRSocketOptionData sockopt;
  PRNetAddr sa;
  PRFileDesc* newsock;
  char* data_buffer = NULL;
  int data_buffer_size;
  int index;
  PRIntervalTime start, connect_done, read_done, write_done, close_done;

#ifdef DEBUG
  fprintf(stdout, "server thread %d alive\n", *id);
#endif

  data_buffer_size =
      (_client_data > _server_data ? _client_data : _server_data);

  if ((data_buffer = (char*)PR_Malloc(data_buffer_size * sizeof(char))) ==
      NULL) {
    fprintf(stderr, "Error creating buffer in server thread %d\n", *id);
    goto done;
  }

  if ((sock = PR_NewTCPSocket()) == NULL) {
    fprintf(stderr, "Error creating socket in server thread %d\n", *id);
    goto done;
  }

  sockopt.option = PR_SockOpt_Reuseaddr;
  sockopt.value.reuse_addr = PR_TRUE;
  if (PR_SetSocketOption(sock, &sockopt) == PR_FAILURE) {
    fprintf(stderr, "Error setting socket option in server thread %d\n", *id);
    goto done;
  }

  memset(&sa, 0, sizeof(sa));
  sa.inet.family = PR_AF_INET;
  sa.inet.port = PR_htons(PORT_BASE + *id);
  sa.inet.ip = PR_htonl(PR_INADDR_ANY);

  if (PR_Bind(sock, &sa) < 0) {
    fprintf(stderr, "Error binding socket in server thread %d errno = %d\n",
            *id, errno);
    goto done;
  }

  if (PR_Listen(sock, 32) < 0) {
    fprintf(stderr, "Error listening to socket in server thread %d\n", *id);
    goto done;
  }

  /* Tell the client to start */
  if (PR_CreateThread(PR_USER_THREAD, _client_thread, id, PR_PRIORITY_NORMAL,
                      scope2, PR_UNJOINABLE_THREAD, 0) == NULL) {
    fprintf(stderr, "Error creating client thread %d\n", *id);
  }

  for (index = 0; index < _iterations; index++) {
#ifdef DEBUG
    fprintf(stdout, "server thread %d loop %d\n", *id, index);
#endif

    start = PR_IntervalNow();

    if ((newsock = PR_Accept(sock, &sa, PR_INTERVAL_NO_TIMEOUT)) == NULL) {
      fprintf(stderr, "Error accepting connection %d in server thread %d\n",
              index, *id);
      goto done;
    }
#ifdef DEBUG
    fprintf(stdout, "server thread %d got connection %d\n", *id, newsock);
#endif

    connect_done = PR_IntervalNow();

    if (_readn(newsock, data_buffer, _client_data) < _client_data) {
      fprintf(
          stderr,
          "Error reading client data for iteration %d in server thread %d\n",
          index, *id);
      goto done;
    }

#ifdef DEBUG
    fprintf(stdout, "server thread %d read %d bytes\n", *id, _client_data);
#endif
    read_done = PR_IntervalNow();

    if (PR_Send(newsock, data_buffer, _server_data, 0, PR_INTERVAL_NO_TIMEOUT) <
        _server_data) {
      fprintf(
          stderr,
          "Error sending client data for iteration %d in server thread %d\n",
          index, *id);
      goto done;
    }

#ifdef DEBUG
    fprintf(stdout, "server thread %d write %d bytes\n", *id, _server_data);
#endif

    write_done = PR_IntervalNow();

    PR_Close(newsock);

    close_done = PR_IntervalNow();

    timer_data[2 * (*id)].d_connect += _delta(&start, &connect_done);
    timer_data[2 * (*id)].d_cl_data += _delta(&connect_done, &read_done);
    timer_data[2 * (*id)].d_sv_data += _delta(&read_done, &write_done);
    timer_data[2 * (*id)].d_close += _delta(&write_done, &close_done);
    timer_data[2 * (*id)].d_total += _delta(&start, &close_done);
    timer_data[2 * (*id)].requests++;

#ifdef DEBUG
    fprintf(stdout, "server: %d %d %d %d %d\n", _delta(&start, &connect_done),
            _delta(&connect_done, &read_done), _delta(&read_done, &write_done),
            _delta(&write_done, &close_done), _delta(&start, &close_done));
#endif
  }

done:
  if (data_buffer != NULL) {
    PR_Free(data_buffer);
  }
  if (sock) {
    PR_Close(sock);
  }
  _thread_exit(*id);
  return;
}

void _client_thread(void* arg_id) {
  int* id = (int*)arg_id;
  int index;
  PRNetAddr sa;
  PRFileDesc* sock_h;
  char* data_buffer = NULL;
  int data_buffer_size;
  int bytes;
  PRIntervalTime start, connect_done, read_done, write_done, close_done;
  PRStatus rv;

#ifdef DEBUG
  fprintf(stdout, "client thread %d alive\n", *id);
#endif

  data_buffer_size =
      (_client_data > _server_data ? _client_data : _server_data);

  if ((data_buffer = (char*)PR_Malloc(data_buffer_size * sizeof(char))) ==
      NULL) {
    fprintf(stderr, "Error creating buffer in server thread %d\n", *id);
    goto done;
  }

  memset(&sa, 0, sizeof(sa));
  rv = PR_InitializeNetAddr(PR_IpAddrLoopback, PORT_BASE + *id, &sa);
  PR_ASSERT(PR_SUCCESS == rv);

  for (index = 0; index < _iterations; index++) {
#ifdef DEBUG
    fprintf(stdout, "client thread %d loop %d\n", *id, index);
#endif

    start = PR_IntervalNow();
    if ((sock_h = PR_NewTCPSocket()) == NULL) {
      fprintf(stderr, "Error creating socket %d in client thread %d\n", index,
              *id);
      goto done;
    }

#ifdef DEBUG
    fprintf(stdout, "client thread %d socket created %d\n", *id, sock_h);
#endif

    if (PR_Connect(sock_h, &sa, PR_INTERVAL_NO_TIMEOUT) < 0) {
      fprintf(stderr, "Error accepting connection %d in client thread %d\n",
              index, *id);
      goto done;
    }

#ifdef DEBUG
    fprintf(stdout, "client thread %d socket connected %d\n", *id, sock_h);
#endif

    connect_done = PR_IntervalNow();
    if (PR_Send(sock_h, data_buffer, _client_data, 0, PR_INTERVAL_NO_TIMEOUT) <
        _client_data) {
      fprintf(
          stderr,
          "Error sending client data for iteration %d in client thread %d\n",
          index, *id);
      goto done;
    }

#ifdef DEBUG
    fprintf(stdout, "client thread %d socket wrote %d\n", *id, _client_data);
#endif

    write_done = PR_IntervalNow();
    if ((bytes = _readn(sock_h, data_buffer, _server_data)) < _server_data) {
      fprintf(stderr,
              "Error reading server data for iteration %d in client thread %d "
              "(read %d bytes)\n",
              index, *id, bytes);
      goto done;
    }

#ifdef DEBUG
    fprintf(stdout, "client thread %d socket read %d\n", *id, _server_data);
#endif

    read_done = PR_IntervalNow();
    PR_Close(sock_h);
    close_done = PR_IntervalNow();

    timer_data[2 * (*id) + 1].d_connect += _delta(&start, &connect_done);
    timer_data[2 * (*id) + 1].d_cl_data += _delta(&connect_done, &write_done);
    timer_data[2 * (*id) + 1].d_sv_data += _delta(&write_done, &read_done);
    timer_data[2 * (*id) + 1].d_close += _delta(&read_done, &close_done);
    timer_data[2 * (*id) + 1].d_total += _delta(&start, &close_done);
    timer_data[2 * (*id) + 1].requests++;
  }
done:
  if (data_buffer != NULL) {
    PR_Free(data_buffer);
  }
  _thread_exit(*id);

  return;
}

static void do_work(void) {
  int index;

  _thread_exit_count = _threads * 2;
  for (index = 0; index < _threads; index++) {
    int* id = (int*)PR_Malloc(sizeof(int));

    *id = index;

    if (PR_CreateThread(PR_USER_THREAD, _server_thread, id, PR_PRIORITY_NORMAL,
                        scope1, PR_UNJOINABLE_THREAD, 0) == NULL) {
      fprintf(stderr, "Error creating server thread %d\n", index);
    }
  }

  PR_EnterMonitor(exit_cv);
  while (_thread_exit_count > 0) {
    PR_Wait(exit_cv, PR_INTERVAL_NO_TIMEOUT);
  }
  PR_ExitMonitor(exit_cv);

  fprintf(stdout, "TEST COMPLETE!\n");

  tally_results(verbose);
}

static void do_workUU(void) {
  scope1 = PR_LOCAL_THREAD;
  scope2 = PR_LOCAL_THREAD;
  do_work();
}

static void do_workUK(void) {
  scope1 = PR_LOCAL_THREAD;
  scope2 = PR_GLOBAL_THREAD;
  do_work();
}

static void do_workKU(void) {
  scope1 = PR_GLOBAL_THREAD;
  scope2 = PR_LOCAL_THREAD;
  do_work();
}

static void do_workKK(void) {
  scope1 = PR_GLOBAL_THREAD;
  scope2 = PR_GLOBAL_THREAD;
  do_work();
}

static void Measure(void (*func)(void), const char* msg) {
  PRIntervalTime start, stop;
  double d;

  start = PR_IntervalNow();
  (*func)();
  stop = PR_IntervalNow();

  d = (double)PR_IntervalToMicroseconds(stop - start);

  printf("%40s: %6.2f usec\n", msg, d / _iterations);
}

int main(int argc, char** argv) {
#if defined(XP_UNIX)
  int opt;
  PR_IMPORT_DATA(char*) optarg;
#endif

#if defined(XP_UNIX)
  while ((opt = getopt(argc, argv, "c:s:i:t:v")) != EOF) {
    switch (opt) {
      case 'i':
        _iterations = atoi(optarg);
        break;
      case 't':
        _threads_max = _threads = atoi(optarg);
        break;
      case 'c':
        _client_data = atoi(optarg);
        break;
      case 's':
        _server_data = atoi(optarg);
        break;
      case 'v':
        verbose = 1;
        break;
      default:
        break;
    }
  }
#endif

  PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
  PR_STDIO_INIT();

  fprintf(stdout,
          "Running test for %d iterations with %d simultaneous threads.\n",
          _iterations, _threads);
  fprintf(stdout,
          "\tWill send %d bytes of client data and %d bytes of server data\n",
          _client_data, _server_data);

  if ((exit_cv = PR_NewMonitor()) == NULL) {
    fprintf(stderr, "Error creating monitor for exit cv\n");
  }
  if ((timer_data = (timer_slot_t*)PR_Malloc(2 * _threads *
                                             sizeof(timer_slot_t))) == NULL) {
    fprintf(stderr, "error allocating thread time results array\n");
  }
  memset(timer_data, 0, 2 * _threads * sizeof(timer_slot_t));

  Measure(do_workUU, "select loop user/user");
  Measure(do_workUK, "select loop user/kernel");
  Measure(do_workKU, "select loop kernel/user");
  Measure(do_workKK, "select loop kernel/kernel");

  return 0;
}

void tally_results(int verbose) {
  int index;
  unsigned long tot_connect = 0;
  unsigned long tot_cl_data = 0;
  unsigned long tot_sv_data = 0;
  unsigned long tot_close = 0;
  unsigned long tot_all = 0;
  unsigned long tot_requests = 0;

  fprintf(stdout, "Server results:\n\n");
  for (index = 0; index < _threads_max * 2; index += 2) {
    if (verbose)
      fprintf(stdout, "server thread %u\t%u\t%u\t%u\t%u\t%u\t%u\n", index,
              timer_data[index].requests, timer_data[index].d_connect,
              timer_data[index].d_cl_data, timer_data[index].d_sv_data,
              timer_data[index].d_close, timer_data[index].d_total);

    tot_connect += timer_data[index].d_connect / _threads;
    tot_cl_data += timer_data[index].d_cl_data / _threads;
    tot_sv_data += timer_data[index].d_sv_data / _threads;
    tot_close += timer_data[index].d_close / _threads;
    tot_all += timer_data[index].d_total / _threads;
    tot_requests += timer_data[index].requests / _threads;
  }
  fprintf(stdout, "----------\n");
  fprintf(stdout, "server per thread totals %u\t%u\t%u\t%u\t%u\n", tot_requests,
          tot_connect, tot_cl_data, tot_sv_data, tot_close);
  fprintf(stdout, "server per thread elapsed time %u\n", tot_all);
  fprintf(stdout, "----------\n");

  tot_connect = tot_cl_data = tot_sv_data = tot_close = tot_all = tot_requests =
      0;
  fprintf(stdout, "Client results:\n\n");
  for (index = 1; index < _threads_max * 2; index += 2) {
    if (verbose)
      fprintf(stdout, "client thread %u\t%u\t%u\t%u\t%u\t%u\t%u\n", index,
              timer_data[index].requests, timer_data[index].d_connect,
              timer_data[index].d_cl_data, timer_data[index].d_sv_data,
              timer_data[index].d_close, timer_data[index].d_total);

    tot_connect += timer_data[index].d_connect / _threads;
    tot_cl_data += timer_data[index].d_cl_data / _threads;
    tot_sv_data += timer_data[index].d_sv_data / _threads;
    tot_close += timer_data[index].d_close / _threads;
    tot_all += timer_data[index].d_total / _threads;
    tot_requests += timer_data[index].requests / _threads;
  }
  fprintf(stdout, "----------\n");
  fprintf(stdout, "client per thread totals %u\t%u\t%u\t%u\t%u\n", tot_requests,
          tot_connect, tot_cl_data, tot_sv_data, tot_close);
  fprintf(stdout, "client per thread elapsed time %u\n", tot_all);
}
