/*
     This file is part of libmicrohttpd
     Copyright (C) 2013, 2015 Christian Grothoff
     Copyright (C) 2014-2021 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_quiesce.c
 * @brief  Testcase for libmicrohttpd quiescing
 * @author Christian Grothoff
 * @author Karlson2k (Evgeny Grin)
 */

#include "MHD_config.h"
#include "platform.h"
#include <curl/curl.h>
#include <microhttpd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <pthread.h>
#include "mhd_sockets.h" /* only macros used */


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

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


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

static int port;

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 enum MHD_Result
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;
  struct MHD_Response *response;
  enum MHD_Result ret;
  (void) version; (void) upload_data; (void) upload_data_size;       /* Unused. Silent compiler warning. */

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


static void
request_completed (void *cls, struct MHD_Connection *connection,
                   void **con_cls, enum MHD_RequestTerminationCode code)
{
  int *done = (int *) cls;
  (void) connection; (void) con_cls; (void) code;    /* Unused. Silent compiler warning. */
  *done = 1;
}


static void *
ServeOneRequest (void *param)
{
  struct MHD_Daemon *d;
  fd_set rs;
  fd_set ws;
  fd_set es;
  MHD_socket fd, max;
  time_t start;
  struct timeval tv;
  int done = 0;

  fd = (MHD_socket) (intptr_t) param;

  d = MHD_start_daemon (MHD_USE_ERROR_LOG,
                        0, NULL, NULL, &ahc_echo, "GET",
                        MHD_OPTION_LISTEN_SOCKET, fd,
                        MHD_OPTION_NOTIFY_COMPLETED, &request_completed, &done,
                        MHD_OPTION_END);
  if (d == NULL)
    return "MHD_start_daemon() failed";

  start = time (NULL);
  while ((time (NULL) - start < 5) && done == 0)
  {
    max = 0;
    FD_ZERO (&rs);
    FD_ZERO (&ws);
    FD_ZERO (&es);
    if (MHD_YES != MHD_get_fdset (d, &rs, &ws, &es, &max))
    {
      MHD_stop_daemon (d);
      MHD_socket_close_chk_ (fd);
      return "MHD_get_fdset() failed";
    }
    tv.tv_sec = 0;
    tv.tv_usec = 1000;
    if (-1 == MHD_SYS_select_ (max + 1, &rs, &ws, &es, &tv))
    {
#ifdef MHD_POSIX_SOCKETS
      if (EINTR != errno)
        abort ();
#else
      if ((WSAEINVAL != WSAGetLastError ()) || (0 != rs.fd_count) || (0 !=
                                                                      ws.
                                                                      fd_count)
          || (0 != es.fd_count) )
        abort ();
      Sleep (1000);
#endif
    }
    MHD_run (d);
  }
  fd = MHD_quiesce_daemon (d);
  if (MHD_INVALID_SOCKET == fd)
  {
    MHD_stop_daemon (d);
    return "MHD_quiesce_daemon() failed in ServeOneRequest()";
  }
  MHD_stop_daemon (d);
  return done ? NULL : "Requests was not served by ServeOneRequest()";
}


static CURL *
setupCURL (void *cbc)
{
  CURL *c;

  c = curl_easy_init ();
  curl_easy_setopt (c, CURLOPT_URL, "http://127.0.0.1/hello_world");
  curl_easy_setopt (c, CURLOPT_PORT, (long) port);
  curl_easy_setopt (c, CURLOPT_WRITEFUNCTION, &copyBuffer);
  curl_easy_setopt (c, CURLOPT_WRITEDATA, cbc);
  curl_easy_setopt (c, CURLOPT_FAILONERROR, 1L);
  curl_easy_setopt (c, CURLOPT_TIMEOUT_MS, 150L);
  curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT_MS, 150L);
  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, 1L);

  return c;
}


static int
testGet (int type, int pool_count, int poll_flag)
{
  struct MHD_Daemon *d;
  CURL *c;
  char buf[2048];
  struct CBC cbc;
  CURLcode errornum;
  MHD_socket fd;
  pthread_t thrd;
  const char *thrdRet;

  if (MHD_NO != MHD_is_feature_supported (MHD_FEATURE_AUTODETECT_BIND_PORT))
    port = 0;
  else
    port = 1480;

  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  if (pool_count > 0)
  {
    d = MHD_start_daemon (type | MHD_USE_ERROR_LOG | MHD_USE_ITC | poll_flag,
                          port, NULL, NULL, &ahc_echo, "GET",
                          MHD_OPTION_THREAD_POOL_SIZE, pool_count,
                          MHD_OPTION_END);

  }
  else
  {
    d = MHD_start_daemon (type | MHD_USE_ERROR_LOG | MHD_USE_ITC | poll_flag,
                          port, NULL, NULL, &ahc_echo, "GET", MHD_OPTION_END);
  }
  if (d == NULL)
    return 1;
  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 32;
    }
    port = (int) dinfo->port;
  }

  c = setupCURL (&cbc);

  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;
  }

  if (cbc.pos != strlen ("/hello_world"))
  {
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 4;
  }
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
  {
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 8;
  }

  fd = MHD_quiesce_daemon (d);
  if (MHD_INVALID_SOCKET == fd)
  {
    fprintf (stderr,
             "MHD_quiesce_daemon failed.\n");
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 2;
  }
  if (0 != pthread_create (&thrd, NULL, &ServeOneRequest,
                           (void *) (intptr_t) fd))
  {
    fprintf (stderr, "pthread_create failed\n");
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 16;
  }

  cbc.pos = 0;
  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;
  }

  if (0 != pthread_join (thrd, (void **) &thrdRet))
  {
    fprintf (stderr, "pthread_join failed\n");
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 16;
  }
  if (NULL != thrdRet)
  {
    fprintf (stderr, "ServeOneRequest() error: %s\n", thrdRet);
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    return 16;
  }

  if (cbc.pos != strlen ("/hello_world"))
  {
    fprintf (stderr, "%s\n", cbc.buf);
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    MHD_socket_close_chk_ (fd);
    return 4;
  }
  if (0 != strncmp ("/hello_world", cbc.buf, strlen ("/hello_world")))
  {
    fprintf (stderr, "%s\n", cbc.buf);
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    MHD_socket_close_chk_ (fd);
    return 8;
  }

  /* at this point, the forked server quit, and the new
   * server has quiesced, so new requests should fail
   */
  if (CURLE_OK == curl_easy_perform (c))
  {
    fprintf (stderr, "curl_easy_perform should fail\n");
    curl_easy_cleanup (c);
    MHD_stop_daemon (d);
    MHD_socket_close_chk_ (fd);
    return 2;
  }
  curl_easy_cleanup (c);
  MHD_stop_daemon (d);
  MHD_socket_close_chk_ (fd);

  return 0;
}


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 maxsock;
#ifdef MHD_WINSOCK_SOCKETS
  int maxposixs; /* Max socket number unused on W32 */
#else  /* MHD_POSIX_SOCKETS */
#define maxposixs maxsock
#endif /* MHD_POSIX_SOCKETS */
  int running;
  struct CURLMsg *msg;
  time_t start;
  struct timeval tv;
  int i;
  MHD_socket fd;

  if (MHD_NO != MHD_is_feature_supported (MHD_FEATURE_AUTODETECT_BIND_PORT))
    port = 0;
  else
    port = 1481;

  multi = NULL;
  cbc.buf = buf;
  cbc.size = 2048;
  cbc.pos = 0;
  d = MHD_start_daemon (MHD_USE_ERROR_LOG,
                        port,
                        NULL, NULL,
                        &ahc_echo, "GET",
                        MHD_OPTION_END);
  if (d == NULL)
    return 256;
  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 32;
    }
    port = (int) dinfo->port;
  }
  c = setupCURL (&cbc);

  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;
  }

  for (i = 0; i < 2; i++)
  {
    start = time (NULL);
    while ( (time (NULL) - start < 5) &&
            (NULL != multi) )
    {
      maxsock = MHD_INVALID_SOCKET;
      maxposixs = -1;
      FD_ZERO (&rs);
      FD_ZERO (&ws);
      FD_ZERO (&es);
      curl_multi_perform (multi, &running);
      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 2048;
      }
      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 4096;
      }
      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
      }
      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 if (i == 0)
            {
              fprintf (stderr,
                       "%s failed at %s:%d: `%s'\n",
                       "curl_multi_perform",
                       __FILE__,
                       __LINE__, curl_easy_strerror (msg->data.result));
            }
          }
        }
        if ((i == 0) && (! curl_fine))
        {
          fprintf (stderr, "libcurl haven't returned OK code\n");
          abort ();
        }
        else if ((i == 1) && (curl_fine))
        {
          fprintf (stderr, "libcurl returned OK code, while it shouldn't\n");
          abort ();
        }
        curl_multi_remove_handle (multi, c);
        curl_multi_cleanup (multi);
        curl_easy_cleanup (c);
        c = NULL;
        multi = NULL;
        break;
      }
      MHD_run (d);
    }

    if (0 == i)
    {
      /* quiesce the daemon on the 1st iteration, so the 2nd should fail */
      fd = MHD_quiesce_daemon (d);
      if (MHD_INVALID_SOCKET == fd)
      {
        fprintf (stderr,
                 "MHD_quiesce_daemon failed.\n");
        curl_multi_remove_handle (multi, c);
        curl_multi_cleanup (multi);
        curl_easy_cleanup (c);
        MHD_stop_daemon (d);
        return 2;
      }
      c = setupCURL (&cbc);
      multi = curl_multi_init ();
      mret = curl_multi_add_handle (multi, c);
      if (mret != CURLM_OK)
      {
        curl_multi_remove_handle (multi, c);
        curl_multi_cleanup (multi);
        curl_easy_cleanup (c);
        MHD_stop_daemon (d);
        return 32768;
      }
    }
  }
  if (NULL != multi)
  {
    curl_multi_remove_handle (multi, c);
    curl_easy_cleanup (c);
    curl_multi_cleanup (multi);
  }
  MHD_stop_daemon (d);
  MHD_socket_close_chk_ (fd);
  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;
  (void) argc; (void) argv; /* Unused. Silent compiler warning. */

  if (0 != curl_global_init (CURL_GLOBAL_WIN32))
    return 2;
  errorCount += testExternalGet ();
  if (MHD_YES == MHD_is_feature_supported (MHD_FEATURE_THREADS))
  {
    errorCount += testGet (MHD_USE_INTERNAL_POLLING_THREAD, 0, 0);
    errorCount += testGet (MHD_USE_THREAD_PER_CONNECTION
                           | MHD_USE_INTERNAL_POLLING_THREAD, 0, 0);
    errorCount += testGet (MHD_USE_INTERNAL_POLLING_THREAD, MHD_CPU_COUNT, 0);
    if (MHD_YES == MHD_is_feature_supported (MHD_FEATURE_POLL))
    {
      errorCount += testGet (MHD_USE_INTERNAL_POLLING_THREAD, 0, MHD_USE_POLL);
      errorCount += testGet (MHD_USE_THREAD_PER_CONNECTION
                             | MHD_USE_INTERNAL_POLLING_THREAD, 0,
                             MHD_USE_POLL);
      errorCount += testGet (MHD_USE_INTERNAL_POLLING_THREAD, MHD_CPU_COUNT,
                             MHD_USE_POLL);
    }
    if (MHD_YES == MHD_is_feature_supported (MHD_FEATURE_EPOLL))
    {
      errorCount += testGet (MHD_USE_INTERNAL_POLLING_THREAD, 0, MHD_USE_EPOLL);
      errorCount += testGet (MHD_USE_INTERNAL_POLLING_THREAD, MHD_CPU_COUNT,
                             MHD_USE_EPOLL);
    }
  }
  if (0 != errorCount)
    fprintf (stderr,
             "Error (code: %u)\n",
             errorCount);
  curl_global_cleanup ();
  return (0 == errorCount) ? 0 : 1;       /* 0 == pass */
}
