/*
     This file is part of libmicrohttpd
     Copyright (C) 2007 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 daemontest_get_chunked.c
 * @brief  Testcase for libmicrohttpd GET operations with chunked content encoding
 *         TODO:
 *         - how to test that chunking was actually used?
 *         - use CURLOPT_HEADERFUNCTION to validate
 *           footer was sent
 * @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>

#ifndef WINDOWS
#include <unistd.h>
#endif

#if defined(CPU_COUNT) && (CPU_COUNT+0) < 2
#undef CPU_COUNT
#endif
#if !defined(CPU_COUNT)
#define CPU_COUNT 2
#endif

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;
}

/**
 * MHD content reader callback that returns
 * data in chunks.
 */
static ssize_t
crc (void *cls, uint64_t pos, char *buf, size_t max)
{
  struct MHD_Response **responseptr = cls;

  if (pos == 128 * 10)
    {
      MHD_add_response_header (*responseptr, "Footer", "working");
      return MHD_CONTENT_READER_END_OF_STREAM;
    }
  if (max < 128)
    abort ();                   /* should not happen in this testcase... */
  memset (buf, 'A' + (pos / 128), 128);
  return 128;
}

/**
 * Dummy function that does nothing.
 */
static void
crcf (void *ptr)
{
  free (ptr);
}

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 **ptr)
{
  static int aptr;
  const char *me = cls;
  struct MHD_Response *response;
  struct MHD_Response **responseptr;
  int ret;

  if (0 != strcmp (me, method))
    return MHD_NO;              /* unexpected method */
  if (&aptr != *ptr)
    {
      /* do never respond on first call */
      *ptr = &aptr;
      return MHD_YES;
    }
  responseptr = malloc (sizeof (struct MHD_Response *));
  if (responseptr == NULL)
    return MHD_NO;
  response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
                                                1024,
                                                &crc, responseptr, &crcf);
  *responseptr = response;
  ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
  MHD_destroy_response (response);
  return ret;
}

static int
validate (struct CBC cbc, int ebase)
{
  int i;
  char buf[128];

  if (cbc.pos != 128 * 10)
    return ebase;

  for (i = 0; i < 10; i++)
    {
      memset (buf, 'A' + i, 128);
      if (0 != memcmp (buf, &cbc.buf[i * 128], 128))
        {
          fprintf (stderr,
                   "Got  `%.*s'\nWant `%.*s'\n",
                   128, buf, 128, &cbc.buf[i * 128]);
          return ebase * 2;
        }
    }
  return 0;
}

static int
testInternalGet ()
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;

  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY | MHD_USE_DEBUG,
                        1080, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  if (d == NULL)
    return 1;
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1:1080/hello_world");
  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, 150L);
  curl_easy_setopt (c, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  // 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);
  MHD_stop_daemon (d);
  return validate (cbc, 4);
}

static int
testMultithreadedGet ()
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;

  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION | MHD_USE_DEBUG,
                        1081, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  if (d == NULL)
    return 16;
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1:1081/hello_world");
  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_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 150L);
  // 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);
  MHD_stop_daemon (d);
  return validate (cbc, 64);
}

static int
testMultithreadedPoolGet ()
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;

  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY | MHD_USE_DEBUG,
                        1081, NULL, NULL, &ahc_echo, "GET",
                        MHD_OPTION_THREAD_POOL_SIZE, CPU_COUNT, MHD_OPTION_END);
  if (d == NULL)
    return 16;
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1:1081/hello_world");
  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_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 150L);
  // 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);
  MHD_stop_daemon (d);
  return validate (cbc, 64);
}

static int
testExternalGet ()
{
  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;
  MHD_socket max;
  int running;
  struct CURLMsg *msg;
  time_t start;
  struct timeval tv;

  multi = NULL;
  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_DEBUG,
                        1082, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  if (d == NULL)
    return 256;
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1:1082/hello_world");
  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_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  curl_easy_setopt (c, CURLOPT_TIMEOUT, 150L);
  curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT, 5L);
  // NOTE: use of CONNECTTIMEOUT without also
  //   setting NOSIGNAL results in really weird
  //   crashes on my system!
  curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1);


  multi = curl_multi_init ();
  if (multi == NULL)
    {
      curl_easy_cleanup (c);
      MHD_stop_daemon (d);
      return 512;
    }
  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) && (multi != 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_multi_cleanup (multi);
              curl_easy_cleanup (c);
              c = NULL;
              multi = NULL;
            }
        }
      MHD_run (d);
    }
  if (multi != NULL)
    {
      curl_multi_remove_handle (multi, c);
      curl_easy_cleanup (c);
      curl_multi_cleanup (multi);
    }
  MHD_stop_daemon (d);
  return validate (cbc, 8192);
}



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

  if (0 != curl_global_init (CURL_GLOBAL_WIN32))
    return 2;
  errorCount += testInternalGet ();
  errorCount += testMultithreadedGet ();
  errorCount += testMultithreadedPoolGet ();
  errorCount += testExternalGet ();
  if (errorCount != 0)
    fprintf (stderr, "Error (code: %u)\n", errorCount);
  curl_global_cleanup ();
  return errorCount != 0;       /* 0 == pass */
}