/*
     This file is part of libmicrohttpd
     Copyright (C) 2007, 2009, 2011 Christian Grothoff
     Copyright (C) 2014-2022 Evgeny Grin (Karlson2k)

     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., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
*/
/**
 * @file test_callback.c
 * @brief Testcase for MHD not calling the callback too often
 * @author Jan Seeger
 * @author Christian Grothoff
 * @author Karlson2k (Evgeny Grin)
 */
#include "MHD_config.h"
#include "platform.h"
#include <curl/curl.h>
#include <microhttpd.h>

struct callback_closure
{
  unsigned int called;
};


static ssize_t
called_twice (void *cls, uint64_t pos, char *buf, size_t max)
{
  struct callback_closure *cls2 = cls;

  (void) pos;    /* Unused. Silence compiler warning. */
  (void) max;
  if (cls2->called == 0)
  {
    memcpy (buf, "test", 5);
    cls2->called = 1;
    return (ssize_t) strlen (buf);
  }
  if (cls2->called == 1)
  {
    cls2->called = 2;
    return MHD_CONTENT_READER_END_OF_STREAM;
  }
  fprintf (stderr,
           "Handler called after returning END_OF_STREAM!\n");
  abort ();
  return MHD_CONTENT_READER_END_WITH_ERROR;
}


static enum MHD_Result
callback (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 **req_cls)
{
  struct callback_closure *cbc = calloc (1, sizeof(struct callback_closure));
  struct MHD_Response *r;
  enum MHD_Result ret;

  (void) cls;
  (void) url;                          /* Unused. Silent compiler warning. */
  (void) method;
  (void) version;
  (void) upload_data; /* Unused. Silent compiler warning. */
  (void) upload_data_size;
  (void) req_cls;         /* Unused. Silent compiler warning. */

  if (NULL == cbc)
    return MHD_NO;
  r = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN, 1024,
                                         &called_twice, cbc,
                                         &free);
  if (NULL == r)
  {
    free (cbc);
    return MHD_NO;
  }
  ret = MHD_queue_response (connection,
                            MHD_HTTP_OK,
                            r);
  MHD_destroy_response (r);
  return ret;
}


static size_t
discard_buffer (void *ptr,
                size_t size,
                size_t nmemb,
                void *ctx)
{
  (void) ptr; (void) ctx;  /* Unused. Silent compiler warning. */
  return size * nmemb;
}


int
main (int argc, char **argv)
{
  struct MHD_Daemon *d;
  fd_set rs;
  fd_set ws;
  fd_set es;
  MHD_socket maxsock;
#ifdef MHD_WINSOCK_SOCKETS
  int maxposixs; /* Max socket number unused on W32 */
#else  /* MHD_POSIX_SOCKETS */
#define maxposixs maxsock
#endif /* MHD_POSIX_SOCKETS */
  CURL *c;
  CURLM *multi;
  CURLMcode mret;
  struct CURLMsg *msg;
  int running;
  struct timeval tv;
  int extra;
  uint16_t port;
  (void) argc; (void) argv; /* Unused. Silent compiler warning. */

  if (MHD_NO != MHD_is_feature_supported (MHD_FEATURE_AUTODETECT_BIND_PORT))
    port = 0;
  else
    port = 1140;

  d = MHD_start_daemon (0,
                        port,
                        NULL,
                        NULL,
                        &callback,
                        NULL,
                        MHD_OPTION_END);
  if (d == NULL)
    return 32;
  if (0 == port)
  {
    const union MHD_DaemonInfo *dinfo;
    dinfo = MHD_get_daemon_info (d, MHD_DAEMON_INFO_BIND_PORT);
    if ((NULL == dinfo) || (0 == dinfo->port) )
    {
      MHD_stop_daemon (d); return 48;
    }
    port = dinfo->port;
  }
  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1/");
  curl_easy_setopt (c, CURLOPT_PORT, (long) port);
  curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &discard_buffer);
  curl_easy_setopt (c, CURLOPT_FAILONERROR, 1L);
  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, 150L);
  curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1L);
  multi = curl_multi_init ();
  if (multi == NULL)
  {
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 99;
  }
  mret = curl_multi_add_handle (multi, c);
  if (mret != CURLM_OK)
  {
    curl_multi_cleanup (multi);
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 99;
  }
  extra = 10;
  while ( (c != NULL) || (--extra > 0) )
  {
    maxsock = MHD_INVALID_SOCKET;
    maxposixs = -1;
    FD_ZERO (&ws);
    FD_ZERO (&rs);
    FD_ZERO (&es);
    curl_multi_perform (multi, &running);
    if (NULL != multi)
    {
      mret = curl_multi_fdset (multi, &rs, &ws, &es, &maxposixs);
      if (mret != CURLM_OK)
      {
        curl_multi_remove_handle (multi, c);
        curl_multi_cleanup (multi);
        curl_easy_cleanup (c);
        MHD_stop_daemon (d);
        return 99;
      }
    }
    if (MHD_YES !=
        MHD_get_fdset (d, &rs, &ws, &es, &maxsock))
    {
      curl_multi_remove_handle (multi, c);
      curl_multi_cleanup (multi);
      curl_easy_cleanup (c);
      MHD_stop_daemon (d);
      return 4;
    }
    tv.tv_sec = 0;
    tv.tv_usec = 1000;
    if (-1 == select (maxposixs + 1, &rs, &ws, &es, &tv))
    {
#ifdef MHD_POSIX_SOCKETS
      if (EINTR != errno)
      {
        fprintf (stderr, "Unexpected select() error: %d. Line: %d\n",
                 (int) errno, __LINE__);
        fflush (stderr);
        exit (99);
      }
#else
      if ((WSAEINVAL != WSAGetLastError ()) ||
          (0 != rs.fd_count) || (0 != ws.fd_count) || (0 != es.fd_count) )
      {
        fprintf (stderr, "Unexpected select() error: %d. Line: %d\n",
                 (int) WSAGetLastError (), __LINE__);
        fflush (stderr);
        exit (99);
      }
      Sleep (1);
#endif
    }
    if (NULL != multi)
    {
      curl_multi_perform (multi, &running);
      if (0 == running)
      {
        int pending;
        int curl_fine = 0;
        while (NULL != (msg = curl_multi_info_read (multi, &pending)))
        {
          if (msg->msg == CURLMSG_DONE)
          {
            if (msg->data.result == CURLE_OK)
              curl_fine = 1;
            else
            {
              fprintf (stderr,
                       "%s failed at %s:%d: `%s'\n",
                       "curl_multi_perform",
                       __FILE__,
                       __LINE__, curl_easy_strerror (msg->data.result));
              abort ();
            }
          }
        }
        if (! curl_fine)
        {
          fprintf (stderr, "libcurl haven't returned OK code\n");
          abort ();
        }
        curl_multi_remove_handle (multi, c);
        curl_multi_cleanup (multi);
        curl_easy_cleanup (c);
        c = NULL;
        multi = NULL;
      }
    }
    MHD_run (d);
  }
  MHD_stop_daemon (d);
  return 0;
}