/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
/*
 * This code sets up multiple easy handles that transfer a single file from
 * the same URL, in a serial manner after each other. Due to the connection
 * sharing within the multi handle all transfers are performed on the same
 * persistent connection.
 *
 * This source code is used for test526, test527 and test532 with branches
 * controlling the small differences.
 *
 * - test526 closes all easy handles after
 *   they all have transferred the file over the single connection
 * - test527 closes each easy handle after each single transfer.
 * - test532 uses only a single easy handle that is removed, reset and then
 *   re-added for each transfer
 *
 * Test case 526, 527 and 532 use FTP, while test 528 uses the lib526 tool but
 * with HTTP.
 */

#include "first.h"

static CURLcode test_lib526(const char *URL)
{
  CURLcode result = CURLE_OK;
  CURL *curl[NUM_HANDLES];
  int running;
  CURLM *multi = NULL;
  size_t current = 0;
  size_t i;

  for(i = 0; i < CURL_ARRAYSIZE(curl); i++)
    curl[i] = NULL;

  start_test_timing();

  global_init(CURL_GLOBAL_ALL);

  /* get each easy handle */
  for(i = 0; i < CURL_ARRAYSIZE(curl); i++) {
    easy_init(curl[i]);
    /* specify target */
    easy_setopt(curl[i], CURLOPT_URL, URL);
    /* go verbose */
    easy_setopt(curl[i], CURLOPT_VERBOSE, 1L);
  }

  multi_init(multi);

  multi_add_handle(multi, curl[current]);

  curl_mfprintf(stderr, "Start at URL 0\n");

  for(;;) {
    struct timeval interval;
    fd_set rd, wr, exc;
    int maxfd = -99;

    interval.tv_sec = 1;
    interval.tv_usec = 0;

    multi_perform(multi, &running);

    abort_on_test_timeout();

    if(!running) {
      if(testnum == 527) {
        /* NOTE: this code does not remove the handle from the multi handle
           here, which would be the nice, sane and documented way of working.
           This however tests that the API survives this abuse gracefully. */
        curl_easy_cleanup(curl[current]);
        curl[current] = NULL;
      }
      if(++current < CURL_ARRAYSIZE(curl)) {
        curl_mfprintf(stderr, "Advancing to URL %zu\n", current);
        if(testnum == 532) {
          /* first remove the only handle we use */
          curl_multi_remove_handle(multi, curl[0]);

          /* make us reuse the same handle all the time, and try resetting
             the handle first too */
          curl_easy_reset(curl[0]);
          easy_setopt(curl[0], CURLOPT_URL, URL);
          /* go verbose */
          easy_setopt(curl[0], CURLOPT_VERBOSE, 1L);

          /* re-add it */
          multi_add_handle(multi, curl[0]);
        }
        else {
          multi_add_handle(multi, curl[current]);
        }
      }
      else {
        break; /* done */
      }
    }

    FD_ZERO(&rd);
    FD_ZERO(&wr);
    FD_ZERO(&exc);

    multi_fdset(multi, &rd, &wr, &exc, &maxfd);

    /* At this point, maxfd is guaranteed to be greater or equal than -1. */

    select_test(maxfd + 1, &rd, &wr, &exc, &interval);

    abort_on_test_timeout();
  }

test_cleanup:

  if((testnum == 526) || (testnum == 528)) {
    /* proper cleanup sequence - type PB */

    for(i = 0; i < CURL_ARRAYSIZE(curl); i++) {
      curl_multi_remove_handle(multi, curl[i]);
      curl_easy_cleanup(curl[i]);
    }
    curl_multi_cleanup(multi);
    curl_global_cleanup();
  }
  else if(testnum == 527) {
    /* Upon non-failure test flow the easy's have already been cleanup'ed. In
       case there is a failure we arrive here with easy's that have not been
       cleanup'ed yet, in this case we have to cleanup them or otherwise these
       leak, let's use undocumented cleanup sequence - type UB */

    if(result != CURLE_OK)
      for(i = 0; i < CURL_ARRAYSIZE(curl); i++)
        curl_easy_cleanup(curl[i]);

    curl_multi_cleanup(multi);
    curl_global_cleanup();
  }
  else if(testnum == 532) {
    /* undocumented cleanup sequence - type UB */

    for(i = 0; i < CURL_ARRAYSIZE(curl); i++)
      curl_easy_cleanup(curl[i]);
    curl_multi_cleanup(multi);
    curl_global_cleanup();
  }

  return result;
}
