/*
     This file is part of libmicrohttpd
     (C) 2007, 2009, 2011 Christian Grothoff

     libmicrohttpd is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, or (at your
     option) any later version.

     libmicrohttpd is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with libmicrohttpd; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file perf_get.c
 * @brief benchmark simple GET operations (sequential access).
 *        Note that we run libcurl in the same process at the
 *        same time, so the execution time given is the combined
 *        time for both MHD and libcurl; it is quite possible
 *        that more time is spend with libcurl than with MHD,
 *        so the performance scores calculated with this code
 *        should NOT be used to compare with other HTTP servers
 *        (since MHD is actually better); only the relative
 *        scores between MHD versions are meaningful.  
 *        Furthermore, this code ONLY tests MHD processing
 *        a single request at a time.  This is again
 *        not universally meaningful (i.e. when comparing
 *        multithreaded vs. single-threaded or select/poll).
 * @author Christian Grothoff
 */

#include "MHD_config.h"
#include "platform.h"
#include <curl/curl.h>
#include <microhttpd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "gauger.h"

#ifndef WINDOWS
#include <unistd.h>
#include <sys/socket.h>
#endif

/**
 * How many rounds of operations do we do for each
 * test?
 */
#define ROUNDS 500

/**
 * Do we use HTTP 1.1?
 */
static int oneone;

/**
 * Response to return (re-used).
 */
static struct MHD_Response *response;

/**
 * Time this round was started.
 */
static unsigned long long start_time;


/**
 * Get the current timestamp 
 *
 * @return current time in ms
 */
static unsigned long long 
now ()
{
  struct timeval tv;

  GETTIMEOFDAY (&tv, NULL);
  return (((unsigned long long) tv.tv_sec * 1000LL) +
	  ((unsigned long long) tv.tv_usec / 1000LL));
}


/**
 * Start the timer.
 */
static void 
start_timer()
{
  start_time = now ();
}


/**
 * Stop the timer and report performance
 *
 * @param desc description of the threading mode we used
 */
static void 
stop (const char *desc)
{
  double rps = ((double) (ROUNDS * 1000)) / ((double) (now() - start_time));

  fprintf (stderr,
	   "Sequential GETs using %s: %f %s\n",
	   desc,
	   rps,
	   "requests/s");
  GAUGER (desc,
	  "Sequential GETs",
	  rps,
	  "requests/s");
}


struct CBC
{
  char *buf;
  size_t pos;
  size_t size;
};


static size_t
copyBuffer (void *ptr, 
	    size_t size, size_t nmemb, 
	    void *ctx)
{
  struct CBC *cbc = ctx;

  if (cbc->pos + size * nmemb > cbc->size)
    return 0;                   /* overflow */
  memcpy (&cbc->buf[cbc->pos], ptr, size * nmemb);
  cbc->pos += size * nmemb;
  return size * nmemb;
}

static int
ahc_echo (void *cls,
          struct MHD_Connection *connection,
          const char *url,
          const char *method,
          const char *version,
          const char *upload_data, size_t *upload_data_size,
          void **unused)
{
  static int ptr;
  const char *me = cls;
  int ret;

  if (0 != strcmp (me, method))
    return MHD_NO;              /* unexpected method */
  if (&ptr != *unused)
    {
      *unused = &ptr;
      return MHD_YES;
    }
  *unused = NULL;
  ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
  if (ret == MHD_NO)
    abort ();
  return ret;
}


static int
testInternalGet (int port, int poll_flag)
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;
  unsigned int i;
  char url[64];

  sprintf(url, "http://127.0.0.1:%d/hello_world", port);

  cbc.buf = buf;
  cbc.size = 2048;
  d = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY | MHD_USE_DEBUG  | poll_flag,
                        port, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  if (d == NULL)
    return 1;
  start_timer ();
  for (i=0;i<ROUNDS;i++)
    {
      cbc.pos = 0;
      c = curl_easy_init ();
      curl_easy_setopt (c, CURLOPT_URL, url);
      curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
      curl_easy_setopt (c, CURLOPT_WRITEDATA, &cbc);
      curl_easy_setopt (c, CURLOPT_FAILONERROR, 1);
      curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
      curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 15L);
      if (oneone)
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
      else
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
      /* NOTE: use of CONNECTTIMEOUT without also
	 setting NOSIGNAL results in really weird
	 crashes on my system!*/
      curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1);
      if (CURLE_OK != (errornum = curl_easy_perform (c)))
	{
	  fprintf (stderr,
		   "curl_easy_perform failed: `%s'\n",
		   curl_easy_strerror (errornum));
	  curl_easy_cleanup (c);
	  MHD_stop_daemon (d);
	  return 2;
	}
      curl_easy_cleanup (c);
    }
  stop (poll_flag ? "internal poll" : "internal select");
  MHD_stop_daemon (d);
  if (cbc.pos != strlen ("/hello_world"))
    return 4;
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
    return 8;
  return 0;
}


static int
testMultithreadedGet (int port, int poll_flag)
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;
  unsigned int i;
  char url[64];

  sprintf(url, "http://127.0.0.1:%d/hello_world", port);

  cbc.buf = buf;
  cbc.size = 2048;
  d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION | MHD_USE_DEBUG  | poll_flag,
                        port, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  if (d == NULL)
    return 16;
  start_timer ();
  for (i=0;i<ROUNDS;i++)
    {
      cbc.pos = 0;
      c = curl_easy_init ();
      curl_easy_setopt (c, CURLOPT_URL, url);
      curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
      curl_easy_setopt (c, CURLOPT_WRITEDATA, &cbc);
      curl_easy_setopt (c, CURLOPT_FAILONERROR, 1);
      curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
      if (oneone)
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
      else
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
      curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 15L);
      /* NOTE: use of CONNECTTIMEOUT without also
	 setting NOSIGNAL results in really weird
	 crashes on my system! */
      curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1);
      if (CURLE_OK != (errornum = curl_easy_perform (c)))
	{
	  fprintf (stderr,
		   "curl_easy_perform failed: `%s'\n",
		   curl_easy_strerror (errornum));
	  curl_easy_cleanup (c);
	  MHD_stop_daemon (d);
	  return 32;
	}
      curl_easy_cleanup (c);
    }
  stop (poll_flag ? "thread with poll" : "thread with select");
  MHD_stop_daemon (d);
  if (cbc.pos != strlen ("/hello_world"))
    return 64;
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
    return 128;
  return 0;
}

static int
testMultithreadedPoolGet (int port, int poll_flag)
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;
  unsigned int i;
  char url[64];

  sprintf(url, "http://127.0.0.1:%d/hello_world", port);

  cbc.buf = buf;
  cbc.size = 2048;
  d = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY | MHD_USE_DEBUG | poll_flag,
                        port, NULL, NULL, &ahc_echo, "GET",
                        MHD_OPTION_THREAD_POOL_SIZE, 4, MHD_OPTION_END);
  if (d == NULL)
    return 16;
  start_timer ();
  for (i=0;i<ROUNDS;i++)
    {
      cbc.pos = 0;
      c = curl_easy_init ();
      curl_easy_setopt (c, CURLOPT_URL, url);
      curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
      curl_easy_setopt (c, CURLOPT_WRITEDATA, &cbc);
      curl_easy_setopt (c, CURLOPT_FAILONERROR, 1);
      curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
      if (oneone)
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
      else
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
      curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 15L);
      /* NOTE: use of CONNECTTIMEOUT without also
	 setting NOSIGNAL results in really weird
	 crashes on my system!*/
      curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1);
      if (CURLE_OK != (errornum = curl_easy_perform (c)))
	{
	  fprintf (stderr,
		   "curl_easy_perform failed: `%s'\n",
		   curl_easy_strerror (errornum));
	  curl_easy_cleanup (c);
	  MHD_stop_daemon (d);
	  return 32;
	}
      curl_easy_cleanup (c);
    }
  stop (poll_flag ? "thread pool with poll" : "thread pool with select");
  MHD_stop_daemon (d);
  if (cbc.pos != strlen ("/hello_world"))
    return 64;
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
    return 128;
  return 0;
}

static int
testExternalGet (int port)
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLM *multi;
  CURLMcode mret;
  fd_set rs;
  fd_set ws;
  fd_set es;
  int max;
  int running;
  struct CURLMsg *msg;
  time_t start;
  struct timeval tv;
  unsigned int i;
  char url[64];

  sprintf(url, "http://127.0.0.1:%d/hello_world", port);

  multi = NULL;
  cbc.buf = buf;
  cbc.size = 2048;
  d = MHD_start_daemon (MHD_USE_DEBUG,
                        port, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  if (d == NULL)
    return 256;
  start_timer ();
  multi = curl_multi_init ();
  if (multi == NULL)
    {
      MHD_stop_daemon (d);
      return 512;
    }
  for (i=0;i<ROUNDS;i++)
    {
      cbc.pos = 0;
      c = curl_easy_init ();
      curl_easy_setopt (c, CURLOPT_URL, url);
      curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
      curl_easy_setopt (c, CURLOPT_WRITEDATA, &cbc);
      curl_easy_setopt (c, CURLOPT_FAILONERROR, 1);
      if (oneone)
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
      else
	curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
      curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
      curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 15L);
      /* NOTE: use of CONNECTTIMEOUT without also
	 setting NOSIGNAL results in really weird
	 crashes on my system! */
      curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1);
      mret = curl_multi_add_handle (multi, c);
      if (mret != CURLM_OK)
	{
	  curl_multi_cleanup (multi);
	  curl_easy_cleanup (c);
	  MHD_stop_daemon (d);
	  return 1024;
	}
      start = time (NULL);
      while ((time (NULL) - start < 5) && (c != NULL))
	{
	  max = 0;
	  FD_ZERO (&rs);
	  FD_ZERO (&ws);
	  FD_ZERO (&es);
	  curl_multi_perform (multi, &running);
	  mret = curl_multi_fdset (multi, &rs, &ws, &es, &max);
	  if (mret != CURLM_OK)
	    {
	      curl_multi_remove_handle (multi, c);
	      curl_multi_cleanup (multi);
	      curl_easy_cleanup (c);
	      MHD_stop_daemon (d);
	      return 2048;
	    }
	  if (MHD_YES != MHD_get_fdset (d, &rs, &ws, &es, &max))
	    {
	      curl_multi_remove_handle (multi, c);
	      curl_multi_cleanup (multi);
	      curl_easy_cleanup (c);
	      MHD_stop_daemon (d);
	      return 4096;
	    }
	  tv.tv_sec = 0;
	  tv.tv_usec = 1000;
	  select (max + 1, &rs, &ws, &es, &tv);
	  curl_multi_perform (multi, &running);
	  if (running == 0)
	    {
	      msg = curl_multi_info_read (multi, &running);
	      if (msg == NULL)
		break;
	      if (msg->msg == CURLMSG_DONE)
		{
		  if (msg->data.result != CURLE_OK)
		    printf ("%s failed at %s:%d: `%s'\n",
			    "curl_multi_perform",
			    __FILE__,
			    __LINE__, curl_easy_strerror (msg->data.result));
		  curl_multi_remove_handle (multi, c);
		  curl_easy_cleanup (c);
		  c = NULL;
		}
	    }
	  MHD_run (d);
	}
      if (NULL != c)
	{
	  curl_multi_remove_handle (multi, c);
	  curl_easy_cleanup (c);
	  fprintf (stderr, "Timeout!?\n");
	}
    }
  stop ("external select");
  if (multi != NULL)
    {
      curl_multi_cleanup (multi);
    }
  MHD_stop_daemon (d);
  if (cbc.pos != strlen ("/hello_world"))
    return 8192;
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
    return 16384;
  return 0;
}


int
main (int argc, char *const *argv)
{
  unsigned int errorCount = 0;
  int port = 1081;

  oneone = NULL != strstr (argv[0], "11");
  if (0 != curl_global_init (CURL_GLOBAL_WIN32))
    return 2;
  response = MHD_create_response_from_buffer (strlen ("/hello_world"),
					      "/hello_world",
					      MHD_RESPMEM_MUST_COPY);
  errorCount += testInternalGet (port++, 0);
  errorCount += testMultithreadedGet (port++, 0);
  errorCount += testMultithreadedPoolGet (port++, 0);
  errorCount += testExternalGet (port++);
#if !WINDOWS
  errorCount += testInternalGet (port++, MHD_USE_POLL);
  errorCount += testMultithreadedGet (port++, MHD_USE_POLL);
  errorCount += testMultithreadedPoolGet (port++, MHD_USE_POLL);
#endif
  MHD_destroy_response (response);
  if (errorCount != 0)
    fprintf (stderr, "Error (code: %u)\n", errorCount);
  curl_global_cleanup ();
  return errorCount != 0;       /* 0 == pass */
}